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diff --git a/vim/autoload/DrawIt.vim b/vim/autoload/DrawIt.vim
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+" DrawIt.vim: a simple way to draw things in Vim
+"
+" Maintainer:	Charles E. Campbell
+" Authors:		Charles E. Campbell <NdrOchipS@PcampbellAfamily.Mbiz> - NOSPAM
+"   			Sylvain Viart (molo@multimania.com)
+" Version:		13
+" Date:			Nov 25, 2013
+"
+" Quick Setup: {{{1
+"              tar -oxvf DrawIt.tar
+"              Should put DrawItPlugin.vim in your .vim/plugin directory,
+"                     put DrawIt.vim       in your .vim/autoload directory
+"                     put DrawIt.txt       in your .vim/doc directory.
+"             Then, use \di to start DrawIt,
+"                       \ds to stop  Drawit, and
+"                       draw by simply moving about using the cursor keys.
+"
+"             You may also use visual-block mode to select endpoints and
+"             draw lines, arrows, and ellipses.
+"
+" Copyright:    Copyright (C) 1999-2012 Charles E. Campbell {{{1
+"               Permission is hereby granted to use and distribute this code,
+"               with or without modifications, provided that this copyright
+"               notice is copied with it. Like anything else that's free,
+"               DrawIt.vim is provided *as is* and comes with no warranty
+"               of any kind, either expressed or implied. By using this
+"               plugin, you agree that in no event will the copyright
+"               holder be liable for any damages resulting from the use
+"               of this software.
+"
+" Required:		THIS SCRIPT REQUIRES VIM 7.0 (or later) {{{1
+" GetLatestVimScripts: 40 1 :AutoInstall: DrawIt.vim
+" GetLatestVimScripts: 1066 1 cecutil.vim
+"
+"  Woe to her who is rebellious and polluted, the oppressing {{{1
+"  city! She didn't obey the voice. She didn't receive correction.
+"  She didn't trust in Yahweh. She didn't draw near to her God. (Zeph 3:1,2 WEB)
+
+" ---------------------------------------------------------------------
+" Load Once: {{{1
+if &cp || exists("g:loaded_DrawIt")
+ finish
+endif
+let g:loaded_DrawIt= "v13"
+if v:version < 700
+ echohl WarningMsg
+ echo "***warning*** this version of DrawIt needs vim 7.0"
+ echohl Normal
+ finish
+endif
+let s:keepcpo= &cpo
+set cpo&vim
+scriptencoding utf-8
+
+" ---------------------------------------------------------------------
+"  Script Variables: {{{1
+if !exists("g:drawit_xstrlen")
+ if exists("g:Align_xstrlen")
+  let g:drawit_xstrlen= g:Align_xstrlen
+ elseif exists("g:netrw_xstrlen")
+  let g:drawit_xstrlen= g:netrw_xstrlen
+ elseif &enc == "latin1" || !has("multi_byte")
+  let g:drawit_xstrlen= 0
+ else
+  let g:drawit_xstrlen= 1
+ endif
+endif
+if !exists("g:drawit_mode")
+ let g:drawit_mode= 'N' " other options: =S (single-line utf-*,cp437) or =D (double-line utf-*,cp437)
+endif
+if !exists("s:saveposn_count")
+ let s:saveposn_count= 0
+endif
+"DechoTabOn
+
+" =====================================================================
+" DrawIt Functions: (by Charles E. Campbell) {{{1
+" =====================================================================
+
+" ---------------------------------------------------------------------
+" DrawIt#DrawItStart: this function maps the cursor keys, sets up default {{{2
+"              drawing characters, and makes some settings
+fun! DrawIt#DrawItStart(...)
+"  call Dfunc("DrawItStart()")
+
+  if a:0 > 0
+   if     exists("b:di_gfxchr") && b:di_gfxchr && (a:1 == 'S' || a:1 == 's')
+	DIsngl
+   elseif exists("b:di_gfxchr") && b:di_gfxchr && (a:1 == 'D' || a:1 == 'd')
+	DIdbl
+   elseif !exists("g:drawit_mode")
+	let g:drawit_mode= 'N'
+   endif
+  endif
+
+  " DrawItStart: report on [DrawIt] mode {{{3
+  if exists("b:dodrawit") && b:dodrawit == 1
+   " already in DrawIt mode
+    echo "[DrawIt] (already on, use ".((exists("mapleader") && mapleader != "")? mapleader : '\')."ds to stop)"
+"   call Dret("DrawItStart")
+   return
+  endif
+  let b:dodrawit= 1
+
+  " indicate in DrawIt mode
+  echo "[DrawIt]"
+
+  " DrawItStart: turn on mouse {{{3
+  if !exists("b:drawit_keep_mouse")
+   let b:drawit_keep_mouse= &mouse
+  endif
+  setl mouse=a
+
+  " DrawItStart: set up DrawIt commands {{{3
+  com! -nargs=1 -range SetBrush <line1>,<line2>call DrawIt#SetBrush(<q-args>)
+  com! -count Canvas call s:Spacer(line("."),line(".") + <count> - 1,0)
+
+  " DrawItStart: set up default drawing characters {{{3
+  if !exists("b:di_vert")   |let b:di_vert    = "|" |endif
+  if !exists("b:di_horiz")  |let b:di_horiz   = "-" |endif
+  if !exists("b:di_plus")   |let b:di_plus    = "+" |endif
+  if !exists("b:di_upright")|let b:di_upright = "/" |endif  " same as downleft
+  if !exists("b:di_upleft") |let b:di_upleft  = "\\"|endif  " same as downright
+  if !exists("b:di_cross")  |let b:di_cross   = "X" |endif
+  if !exists("b:di_ellipse")|let b:di_ellipse = '*' |endif
+
+  let b:di_gfxchr= 1
+  if &enc == 'utf-8' || &enc == 'utf-16' || &enc == "ucs-4"
+   " Box drawing characters using unicode
+   " │ ─ ┌ ┐ └ ┘ ┬ ┴ ├ ┤ ┼ ╱ ╲ ╳
+   " ║ ═ ╔ ╗ ╚ ╝ ╦ ╩ ╠ ╣ ╬      
+"   call Decho("box drawing characters using unicode")
+   if !exists("b:di_Svert")   |let b:di_Svert   = '│' |endif
+   if !exists("b:di_Dvert")   |let b:di_Dvert   = '║' |endif
+   if !exists("b:di_Shoriz")  |let b:di_Shoriz  = '─' |endif
+   if !exists("b:di_Dhoriz")  |let b:di_Dhoriz  = '═' |endif
+   if !exists("b:di_Sulcorn") |let b:di_Sulcorn = '┌' |endif
+   if !exists("b:di_Dulcorn") |let b:di_Dulcorn = '╔' |endif
+   if !exists("b:di_Surcorn") |let b:di_Surcorn = '┐' |endif
+   if !exists("b:di_Durcorn") |let b:di_Durcorn = '╗' |endif
+   if !exists("b:di_Sllcorn") |let b:di_Sllcorn = '└' |endif
+   if !exists("b:di_Dllcorn") |let b:di_Dllcorn = '╚' |endif
+   if !exists("b:di_Slrcorn") |let b:di_Slrcorn = '┘' |endif
+   if !exists("b:di_Dlrcorn") |let b:di_Dlrcorn = '╝' |endif
+   if !exists("b:di_Splus")   |let b:di_Splus   = '┼' |endif
+   if !exists("b:di_Dplus")   |let b:di_Dplus   = '╬' |endif
+   if !exists("b:di_Sdnplus") |let b:di_Sdnplus = '┬' |endif
+   if !exists("b:di_Ddnplus") |let b:di_Ddnplus = '╦' |endif
+   if !exists("b:di_Supplus") |let b:di_Supplus = '┴' |endif
+   if !exists("b:di_Dupplus") |let b:di_Dupplus = '╩' |endif
+   if !exists("b:di_Slplus")  |let b:di_Slplus  = '┤' |endif
+   if !exists("b:di_Dlplus")  |let b:di_Dlplus  = '╣' |endif
+   if !exists("b:di_Srplus")  |let b:di_Srplus  = '├' |endif
+   if !exists("b:di_Drplus")  |let b:di_Drplus  = '╠' |endif
+   if !exists("b:di_Supright")|let b:di_Supright= "╱" |endif  " same as Sdownleft
+   if !exists("b:di_Supleft") |let b:di_Supleft = "╲" |endif  " same as Sdownright
+   if !exists("b:di_Scross")  |let b:di_Scross  = "╳" |endif
+ 
+   " Mixed Single-Double unicode box drawing characters
+   " ╞ ╟ ╡ ╢ ╤ ╥ ╧ ╪ ╫
+   if !exists("b:di_DhSd")  |let b:di_DhSd = '╤' |endif
+   if !exists("b:di_DhSu")  |let b:di_DhSu = '╧' |endif
+   if !exists("b:di_DuSl")  |let b:di_DuSl = '╢' |endif
+   if !exists("b:di_DuSlr") |let b:di_DuSlr= '╫' |endif
+   if !exists("b:di_DuSr")  |let b:di_DuSr = '╟' |endif
+   if !exists("b:di_ShDd")  |let b:di_ShDd = '╥' |endif
+   if !exists("b:di_ShDu")  |let b:di_ShDu = '╨' |endif
+   if !exists("b:di_SuDl")  |let b:di_SuDl = '╡' |endif
+   if !exists("b:di_SuDlr") |let b:di_SuDlr= '╪' |endif
+   if !exists("b:di_SdDh")  |let b:di_SdDh = '╤' |endif
+   if !exists("b:di_SuDh")  |let b:di_SuDh = '╧' |endif
+   if !exists("b:di_SuDr")  |let b:di_SuDr = '╞' |endif
+ 
+   " Mixed Single-Double unicode box drawing corner characters
+   " ╒ ╓ ╕ ╖ ╘ ╙ ╛ ╜
+   if !exists("b:di_cSdDr")| let b:di_cSdDr= '╒'| endif
+   if !exists("b:di_cDdSr")| let b:di_cDdSr= '╓'| endif
+   if !exists("b:di_cDlSd")| let b:di_cDlSd= '╕'| endif
+   if !exists("b:di_cSlDd")| let b:di_cSlDd= '╖'| endif
+   if !exists("b:di_cDrSu")| let b:di_cDrSu= '╘'| endif
+   if !exists("b:di_cSrDu")| let b:di_cSrDu= '╙'| endif
+   if !exists("b:di_cDlSu")| let b:di_cDlSu= '╛'| endif
+   if !exists("b:di_cSlDu")| let b:di_cSlDu= '╜'| endif
+
+  elseif &enc == 'cp437'
+   " Box drawing characters using cp437 (dos)
+"   call Decho("box drawing characters using cp437")
+   if !exists("b:di_Svert")   |let b:di_Svert   = nr2char(179) |endif   " │
+   if !exists("b:di_Dvert")   |let b:di_Dvert   = nr2char(186) |endif   " ║
+   if !exists("b:di_Shoriz")  |let b:di_Shoriz  = nr2char(196) |endif   " ─
+   if !exists("b:di_Dhoriz")  |let b:di_Dhoriz  = nr2char(205) |endif   " ═
+   if !exists("b:di_Sulcorn") |let b:di_Sulcorn = nr2char(218) |endif   " ┌
+   if !exists("b:di_Dulcorn") |let b:di_Dulcorn = nr2char(201) |endif   " ╔
+   if !exists("b:di_Surcorn") |let b:di_Surcorn = nr2char(191) |endif   " ┐
+   if !exists("b:di_Durcorn") |let b:di_Durcorn = nr2char(187) |endif   " ╗
+   if !exists("b:di_Sllcorn") |let b:di_Sllcorn = nr2char(192) |endif   " └
+   if !exists("b:di_Dllcorn") |let b:di_Dllcorn = nr2char(200) |endif   " ╚
+   if !exists("b:di_Slrcorn") |let b:di_Slrcorn = nr2char(217) |endif   " ┘
+   if !exists("b:di_Dlrcorn") |let b:di_Dlrcorn = nr2char(188) |endif   " ╝
+   if !exists("b:di_Splus")   |let b:di_Splus   = nr2char(197) |endif   " ┼
+   if !exists("b:di_Dplus")   |let b:di_Dplus   = nr2char(206) |endif   " ╬
+   if !exists("b:di_Sdnplus") |let b:di_Sdnplus = nr2char(194) |endif   " ┬
+   if !exists("b:di_Ddnplus") |let b:di_Ddnplus = nr2char(203) |endif   " ╦
+   if !exists("b:di_Supplus") |let b:di_Supplus = nr2char(193) |endif   " ┴
+   if !exists("b:di_Dupplus") |let b:di_Dupplus = nr2char(202) |endif   " ╩
+   if !exists("b:di_Slplus")  |let b:di_Slplus  = nr2char(180) |endif   " ┤
+   if !exists("b:di_Dlplus")  |let b:di_Dlplus  = nr2char(185) |endif   " ╣
+   if !exists("b:di_Srplus")  |let b:di_Srplus  = nr2char(195) |endif   " ├
+   if !exists("b:di_Drplus")  |let b:di_Drplus  = nr2char(204) |endif   " ╠
+   if !exists("b:di_Supright")|let b:di_Supright= '/'          |endif   " ╱
+   if !exists("b:di_Supleft") |let b:di_Supleft = '\'          |endif   " ╲
+   if !exists("b:di_Scross")  |let b:di_Scross  = 'X'          |endif   " ╳
+ 
+   " Mixed Single-Double cp437 box drawing characters
+   if !exists("b:di_DhSd")  |let b:di_DhSd = nr2char(209)|endif     " ╤
+   if !exists("b:di_DhSu")  |let b:di_DhSu = nr2char(207)|endif     " ╧
+   if !exists("b:di_DuSl")  |let b:di_DuSl = nr2char(182)|endif     " ╢
+   if !exists("b:di_DuSlr") |let b:di_DuSlr= nr2char(215)|endif     " ╫
+   if !exists("b:di_DuSr")  |let b:di_DuSr = nr2char(199)|endif     " ╟
+   if !exists("b:di_ShDd")  |let b:di_ShDd = nr2char(210)|endif     " ╥
+   if !exists("b:di_ShDu")  |let b:di_ShDu = nr2char(208)|endif     " ╨
+   if !exists("b:di_SuDl")  |let b:di_SuDl = nr2char(181)|endif     " ╡
+   if !exists("b:di_SuDlr") |let b:di_SuDlr= nr2char(216)|endif     " ╪
+   if !exists("b:di_SdDh")  |let b:di_SdDh = nr2char(209)|endif     " ╤
+   if !exists("b:di_SuDh")  |let b:di_SuDh = nr2char(207)|endif     " ╧
+   if !exists("b:di_SuDr")  |let b:di_SuDr = nr2char(198)|endif     " ╞
+ 
+   " Mixed Single-Double cp437 box drawing corner characters
+   if !exists("b:di_cSdDr")| let b:di_cSdDr= nr2char(213)| endif    " ╒
+   if !exists("b:di_cDdSr")| let b:di_cDdSr= nr2char(214)| endif    " ╓
+   if !exists("b:di_cDlSd")| let b:di_cDlSd= nr2char(184)| endif    " ╕
+   if !exists("b:di_cSlDd")| let b:di_cSlDd= nr2char(183)| endif    " ╖
+   if !exists("b:di_cDrSu")| let b:di_cDrSu= nr2char(212)| endif    " ╘
+   if !exists("b:di_cSrDu")| let b:di_cSrDu= nr2char(211)| endif    " ╙
+   if !exists("b:di_cDlSu")| let b:di_cDlSu= nr2char(190)| endif    " ╛
+   if !exists("b:di_cSlDu")| let b:di_cSlDu= nr2char(189)| endif    " ╜
+
+  else
+"   call Decho("regular box drawing characters only")
+   let b:di_gfxchr = 0
+  endif
+
+  " set up initial DrawIt behavior (as opposed to erase behavior)
+  let b:di_erase     = 0
+
+  call s:DrawItSaveUserSettings()
+
+  " DrawItStart: save and unmap user maps {{{3
+  let b:lastdir    = 1
+  if exists("mapleader")
+   let usermaplead  = mapleader
+  else
+   let usermaplead  = "\\"
+  endif
+  call SaveUserMaps("bn","","><^v","DrawIt")
+  call SaveUserMaps("bv",usermaplead,"abceflsy","DrawIt")
+  call SaveUserMaps("bn","","<c-v>","DrawIt")
+  call SaveUserMaps("bn",usermaplead,"h><v^","DrawIt")
+  call SaveUserMaps("bn","","<left>","DrawIt")
+  call SaveUserMaps("bn","","<right>","DrawIt")
+  call SaveUserMaps("bn","","<up>","DrawIt")
+  call SaveUserMaps("bn","","<down>","DrawIt")
+  call SaveUserMaps("bn","","<left>","DrawIt")
+  call SaveUserMaps("bn","","<s-right>","DrawIt")
+  call SaveUserMaps("bn","","<s-up>","DrawIt")
+  call SaveUserMaps("bn","","<s-down>","DrawIt")
+  call SaveUserMaps("bn","","<space>","DrawIt")
+  call SaveUserMaps("bn","","<home>","DrawIt")
+  call SaveUserMaps("bn","","<end>","DrawIt")
+  call SaveUserMaps("bn","","<pageup>","DrawIt")
+  call SaveUserMaps("bn","","<pagedown>","DrawIt")
+  call SaveUserMaps("bn","","<c-leftdrag>","DrawIt")
+  call SaveUserMaps("bn","","<c-leftmouse>","DrawIt")
+  call SaveUserMaps("bn","","<c-leftrelease>","DrawIt")
+  call SaveUserMaps("bn","","<leftdrag>","DrawIt")
+  call SaveUserMaps("bn","","<leftmouse>","DrawIt")
+  call SaveUserMaps("bn","","<middlemouse>","DrawIt")
+  call SaveUserMaps("bn","","<rightmouse>","DrawIt")
+  call SaveUserMaps("bn","","<s-leftdrag>","DrawIt")
+  call SaveUserMaps("bn","","<s-leftmouse>","DrawIt")
+  call SaveUserMaps("bn","","<s-leftrelease>","DrawIt")
+  call SaveUserMaps("bv","","<c-leftmouse>","DrawIt")
+  call SaveUserMaps("bv","","<leftmouse>","DrawIt")
+  call SaveUserMaps("bv","","<middlemouse>","DrawIt")
+  call SaveUserMaps("bv","","<rightmouse>","DrawIt")
+  call SaveUserMaps("bv","","<s-leftmouse>","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pa","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pb","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pc","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pd","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pe","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pf","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pg","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":ph","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pi","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pj","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pk","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pl","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pm","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pn","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":po","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pp","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pq","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pr","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":ps","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pt","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pu","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pv","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pw","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":px","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":py","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":pz","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":ra","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rb","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rc","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rd","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":re","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rf","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rg","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rh","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":ri","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rj","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rk","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rl","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rm","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rn","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":ro","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rp","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rq","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rr","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rs","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rt","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":ru","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rv","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rw","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rx","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":ry","DrawIt")
+  call SaveUserMaps("bn",usermaplead,":rz","DrawIt")
+  if exists("g:drawit_insertmode") && g:drawit_insertmode
+   call SaveUserMaps("bi","","<left>","DrawIt")
+   call SaveUserMaps("bi","","<right>","DrawIt")
+   call SaveUserMaps("bi","","<up>","DrawIt")
+   call SaveUserMaps("bi","","<down>","DrawIt")
+   call SaveUserMaps("bi","","<left>","DrawIt")
+   call SaveUserMaps("bi","","<s-right>","DrawIt")
+   call SaveUserMaps("bi","","<s-up>","DrawIt")
+   call SaveUserMaps("bi","","<s-down>","DrawIt")
+   call SaveUserMaps("bi","","<home>","DrawIt")
+   call SaveUserMaps("bi","","<end>","DrawIt")
+   call SaveUserMaps("bi","","<pageup>","DrawIt")
+   call SaveUserMaps("bi","","<pagedown>","DrawIt")
+   call SaveUserMaps("bi","","<leftmouse>","DrawIt")
+  endif
+  call SaveUserMaps("bn","",":\<c-v>","DrawIt")
+
+  " DrawItStart: DrawIt maps (Charles Campbell) {{{3
+  nmap <silent> <buffer> <script> <left>		:set lz<CR>:silent! call <SID>DrawLeft()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <right>		:set lz<CR>:silent! call <SID>DrawRight()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <up>			:set lz<CR>:silent! call <SID>DrawUp()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <down>		:set lz<CR>:silent! call <SID>DrawDown()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <s-left>		:set lz<CR>:silent! call <SID>MoveLeft()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <s-right>		:set lz<CR>:silent! call <SID>MoveRight()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <s-up>		:set lz<CR>:silent! call <SID>MoveUp()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <s-down>		:set lz<CR>:silent! call <SID>MoveDown()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <space>		:set lz<CR>:silent! call <SID>DrawErase()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> >				:set lz<CR>:silent! call <SID>DrawSpace('>',1)<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <				:set lz<CR>:silent! call <SID>DrawSpace('<',2)<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> ^				:set lz<CR>:silent! call <SID>DrawSpace('^',3)<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> v				:set lz<CR>:silent! call <SID>DrawSpace('v',4)<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <home>		:set lz<CR>:silent! call <SID>DrawSlantUpLeft()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <end>			:set lz<CR>:silent! call <SID>DrawSlantDownLeft()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <pageup>		:set lz<CR>:silent! call <SID>DrawSlantUpRight()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <pagedown>	:set lz<CR>:silent! call <SID>DrawSlantDownRight()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <Leader>>		:set lz<CR>:silent! call <SID>DrawFatRArrow()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <Leader><		:set lz<CR>:silent! call <SID>DrawFatLArrow()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <Leader>^		:set lz<CR>:silent! call <SID>DrawFatUArrow()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <Leader>v		:set lz<CR>:silent! call <SID>DrawFatDArrow()<CR>:set nolz<CR>
+  nmap <silent> <buffer> <script> <Leader>f		:call <SID>Flood()<cr>
+
+  " DrawItStart: Set up insertmode maps {{{3
+  if exists("g:drawit_insertmode") && g:drawit_insertmode
+   imap <silent> <buffer> <script> <left>     <Esc><left>a
+   imap <silent> <buffer> <script> <right>    <Esc><right>a
+   imap <silent> <buffer> <script> <up>       <Esc><up>a
+   imap <silent> <buffer> <script> <down>     <Esc><down>a
+   imap <silent> <buffer> <script> <left>     <Esc><left>a
+   imap <silent> <buffer> <script> <s-right>  <Esc><s-right>a
+   imap <silent> <buffer> <script> <s-up>     <Esc><s-up>a
+   imap <silent> <buffer> <script> <s-down>   <Esc><s-down>a
+   imap <silent> <buffer> <script> <home>     <Esc><home>a
+   imap <silent> <buffer> <script> <end>      <Esc><end>a
+   imap <silent> <buffer> <script> <pageup>   <Esc><pageup>a
+   imap <silent> <buffer> <script> <pagedown> <Esc><pagedown>a
+  endif
+
+  " DrawItStart: set up drawing mode mappings (Sylvain Viart) {{{3
+  nnoremap <silent> <buffer> <script> <c-v>      :call <SID>LeftStart()<CR><c-v>
+  vmap     <silent> <buffer> <script> <Leader>a  :<c-u>call <SID>CallBox('Arrow')<CR>
+  vmap     <silent> <buffer> <script> <Leader>b  :<c-u>call <SID>CallBox('DrawBox')<cr>
+  nmap              <buffer> <script> <Leader>c  :call <SID>Canvas()<cr>
+  vmap     <silent> <buffer> <script> <Leader>l  :<c-u>call <SID>CallBox('DrawPlainLine')<CR>
+  vmap     <silent> <buffer> <script> <Leader>s  :<c-u>call <SID>Spacer(line("'<"), line("'>"),0)<cr>
+
+  " DrawItStart: set up drawing mode mappings (Charles Campbell) {{{3
+  " \pa ... \pz : blanks are transparent
+  " \ra ... \rz : blanks copy over
+  vmap <buffer> <silent> <Leader>e   :<c-u>call <SID>CallBox('DrawEllipse')<CR>
+  
+  let allreg= "abcdefghijklmnopqrstuvwxyz"
+  while strlen(allreg) > 0
+   let ireg= strpart(allreg,0,1)
+   exe "nmap <silent> <buffer> <Leader>p".ireg.'  :<c-u>set lz<cr>:silent! call <SID>PutBlock("'.ireg.'",0)<cr>:set nolz<cr>'
+   exe "nmap <silent> <buffer> <Leader>r".ireg.'  :<c-u>set lz<cr>:silent! call <SID>PutBlock("'.ireg.'",1)<cr>:set nolz<cr>'
+   let allreg= strpart(allreg,1)
+  endwhile
+
+  " DrawItStart: mouse maps  (Sylvain Viart) {{{3
+  " start visual-block with leftmouse
+  nnoremap <silent> <buffer> <script> <leftmouse>    <leftmouse>:call <SID>LeftStart()<CR><c-v>
+  vnoremap <silent> <buffer> <script> <rightmouse>   <leftmouse>:<c-u>call <SID>RightStart(1)<cr>
+  vnoremap <silent> <buffer> <script> <middlemouse>  <leftmouse>:<c-u>call <SID>RightStart(0)<cr>
+  vnoremap <silent> <buffer> <script> <c-leftmouse>  <leftmouse>:<c-u>call <SID>CLeftStart()<cr>
+
+  " DrawItStart: mouse maps (Charles Campbell) {{{3
+  " Draw with current brush
+  nnoremap <silent> <buffer> <script> <s-leftmouse>  <leftmouse>:call <SID>SLeftStart()<CR><c-v>
+  nnoremap <silent> <buffer> <script> <c-leftmouse>  <leftmouse>:call <SID>CLeftStart()<CR><c-v>
+
+ " DrawItStart: Menu support {{{3
+ if has("gui_running") && has("menu") && &go =~# 'm'
+  exe 'menu '.g:DrChipTopLvlMenu.'DrawIt.Stop\ \ DrawIt<tab>\\ds				<Leader>ds'
+  exe 'menu '.g:DrChipTopLvlMenu.'DrawIt.Toggle\ Erase\ Mode<tab><space>	<space>'
+  exe 'menu '.g:DrChipTopLvlMenu.'DrawIt.Draw\ Arrow<tab>\\a					<Leader>a'
+  exe 'menu '.g:DrChipTopLvlMenu.'DrawIt.Draw\ Box<tab>\\b						<Leader>b'
+  exe 'menu '.g:DrChipTopLvlMenu.'DrawIt.Make\ Blank\ Zone<tab>\\c			<Leader>c'
+  exe 'menu '.g:DrChipTopLvlMenu.'DrawIt.Draw\ Ellipse<tab>\\e					<Leader>e'
+  exe 'menu '.g:DrChipTopLvlMenu.'DrawIt.Draw\ Flood<tab>\\e					<Leader>f'
+  exe 'menu '.g:DrChipTopLvlMenu.'DrawIt.Draw\ Line<tab>\\l						<Leader>l'
+  exe 'menu '.g:DrChipTopLvlMenu.'DrawIt.Append\ Blanks<tab>\\s				<Leader>s'
+  exe 'silent! unmenu '.g:DrChipTopLvlMenu.'DrawIt.Start\ DrawIt'
+ endif
+" call Dret("DrawItStart")
+endfun
+
+" ---------------------------------------------------------------------
+" DrawIt#DrawItStop: this function unmaps the cursor keys and restores settings {{{2
+fun! DrawIt#DrawItStop()
+"  call Dfunc("DrawItStop()")
+ 
+  " DrawItStop: report on [DrawIt off] mode {{{3
+  if !exists("b:dodrawit")
+   echo "[DrawIt off]"
+"   call Dret("DrawItStop")
+   return
+  endif
+
+  " DrawItStop: restore mouse {{{3
+  if exists("b:drawit_keep_mouse")
+   let &mouse= b:drawit_keep_mouse
+   unlet b:drawit_keep_mouse
+  endif
+  unlet b:dodrawit
+  echo "[DrawIt off]"
+
+  if exists("b:drawit_canvas_used")
+   " DrawItStop: clean up trailing white space {{{3
+   call s:SavePosn()
+   silent! %s/\s\+$//e
+   unlet b:drawit_canvas_used
+   call s:RestorePosn()
+  endif
+
+  " DrawItStop: remove drawit commands {{{3
+  delc SetBrush
+
+  " DrawItStop: insure that erase mode is off {{{3
+  " (thanks go to Gary Johnson for this)
+  if b:di_erase == 1
+  	call s:DrawErase()
+  endif
+
+  " DrawItStop: restore user map(s), if any {{{3
+  call RestoreUserMaps("DrawIt")
+
+  call s:DrawItRestoreUserSettings()
+
+ " DrawItStop: DrChip menu support: {{{3
+ if has("gui_running") && has("menu") && &go =~# 'm'
+  exe 'menu   '.g:DrChipTopLvlMenu.'DrawIt.Start\ DrawIt<tab>\\di		<Leader>di'
+  exe 'unmenu '.g:DrChipTopLvlMenu.'DrawIt.Stop\ \ DrawIt'
+  exe 'unmenu '.g:DrChipTopLvlMenu.'DrawIt.Toggle\ Erase\ Mode'
+  exe 'unmenu '.g:DrChipTopLvlMenu.'DrawIt.Draw\ Arrow'
+  exe 'unmenu '.g:DrChipTopLvlMenu.'DrawIt.Draw\ Box'
+  exe 'unmenu '.g:DrChipTopLvlMenu.'DrawIt.Draw\ Ellipse'
+  exe 'unmenu '.g:DrChipTopLvlMenu.'DrawIt.Draw\ Flood'
+  exe 'unmenu '.g:DrChipTopLvlMenu.'DrawIt.Draw\ Line'
+  exe 'unmenu '.g:DrChipTopLvlMenu.'DrawIt.Make\ Blank\ Zone'
+  exe 'unmenu '.g:DrChipTopLvlMenu.'DrawIt.Append\ Blanks'
+ endif
+" call Dret("DrawItStop")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawItSaveUserSettings: saves user settings, changes them to be safe for DrawIt {{{2
+"                           Use s:DrawItRestoreUserSettings() to restore.
+fun! s:DrawItSaveUserSettings()
+"  call Dfunc("s:DrawItSaveUserSettings()")
+  " save user settings
+  let b:di_aikeep    = &l:ai
+  let b:di_cedit     = &cedit
+  let b:di_cinkeep   = &l:cin
+  let b:di_cpokeep   = &l:cpo
+  let b:di_etkeep    = &l:et
+  let b:di_fokeep    = &l:fo
+  let b:di_gdkeep    = &l:gd
+  let b:di_gokeep    = &l:go
+  let b:di_magickeep = &l:magic
+  let b:di_remapkeep = &l:remap
+  let b:di_repkeep   = &l:report
+  let b:di_sikeep    = &l:si
+  let b:di_stakeep   = &l:sta
+  let b:di_vekeep    = &l:ve
+
+  " change user settings to something safe for DrawIt
+  setl cpo&vim
+  setl nocin noai nosi nogd sta et ve=all report=10000
+  setl go-=aA
+  setl fo-=a
+  setl remap magic
+  set  cedit&
+"  call Dret("s:DrawItSaveUserSettings")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawItRestoreUserSettings: restore user settings {{{2
+fun! s:DrawItRestoreUserSettings()
+"  call Dfunc("s:DrawItRestoreUserSettings()")
+
+  " restore user's settings
+  let &l:ai     = b:di_aikeep
+  let &l:cin    = b:di_cinkeep
+  let &l:cpo    = b:di_cpokeep
+  let &l:et     = b:di_etkeep
+  let &l:fo     = b:di_fokeep
+  let &l:gd     = b:di_gdkeep
+  let &l:go     = b:di_gokeep
+  let &l:magic  = b:di_magickeep
+  let &l:remap  = b:di_remapkeep
+  let &l:report = b:di_repkeep
+  let &l:si     = b:di_sikeep
+  let &l:sta    = b:di_stakeep
+  let &l:ve     = b:di_vekeep
+  unlet b:di_aikeep  
+  unlet b:di_cinkeep 
+  unlet b:di_cpokeep 
+  unlet b:di_etkeep  
+  unlet b:di_fokeep  
+  unlet b:di_gdkeep  
+  unlet b:di_gokeep  
+  unlet b:di_magickeep
+  unlet b:di_remapkeep
+  unlet b:di_repkeep
+  unlet b:di_sikeep  
+  unlet b:di_stakeep 
+  unlet b:di_vekeep  
+"  call Dret("s:DrawItRestoreUserSettings")
+endfun
+
+" ---------------------------------------------------------------------
+" DrawIt#SetMode: sets normal, single, double drawing mode, and ensures that DrawIt mode is on {{{2
+fun! DrawIt#SetMode(mode)
+"  call Dfunc("DrawIt#SetMode(mode=".a:mode.")")
+  if &enc == 'utf-8' || &enc == 'cp437' || &enc == 'utf-16' || &enc == 'ucs-4'
+   let b:di_gfxchr= 1
+  else
+   let b:di_gfxchr= 0
+  endif
+  if b:di_gfxchr == 0
+   let g:drawit_mode= 'N'
+  elseif &enc != 'utf-8' && &enc != 'cp437' && &enc != 'utf-16' && &enc != 'ucs-4'
+   let g:drawit_mode = 'N'
+   let b:di_gfxchr   = 0
+  elseif a:mode =~ '^[sS]$'
+   let g:drawit_mode= 'S'
+  elseif a:mode =~ '^[dD]$'
+   let g:drawit_mode= 'D'
+  else
+   let g:drawit_mode = 'N'
+   let b:di_gfxchr   = 0
+  endif
+  if !exists("b:dodrawit") || b:dodrawit == 0
+   call DrawIt#DrawItStart()
+  endif
+"  call Dret("DrawIt#SetMode")
+endfun
+
+" ---------------------------------------------------------------------
+" SetDrawIt: this function allows one to change the drawing characters {{{2
+fun! SetDrawIt(di_vert,di_horiz,di_plus,di_upleft,di_upright,di_cross,di_ellipse)
+"  call Dfunc("SetDrawIt(vert<".a:di_vert."> horiz<".a:di_horiz."> plus<".a:di_plus."> upleft<".a:di_upleft."> upright<".a:di_upright."> cross<".a:di_cross."> ellipse<".a:di_ellipse.">)")
+  let b:di_vert    = a:di_vert
+  let b:di_horiz   = a:di_horiz
+  let b:di_plus    = a:di_plus
+  let b:di_upleft  = a:di_upleft
+  let b:di_upright = a:di_upright
+  let b:di_cross   = a:di_cross
+  let b:di_ellipse = a:di_ellipse
+"  call Dret("SetDrawIt")
+endfun
+
+" =====================================================================
+" s:DrawLeft: {{{2
+fun! s:DrawLeft()
+"  call Dfunc("s:DrawLeft()")
+  let curline   = getline(".")
+  let curcol    = virtcol(".")
+  let b:lastdir = 2
+  let keepatat  = @@
+"  call Decho("curcol#".curcol." curline<".curline.">")
+
+  if curcol > 0
+   norm! vy
+   let curchar= @@
+"   call Decho("curchar<".curchar.">")
+"   let curchar = strpart(curline,curcol-1,1)
+
+   " step1: Replace
+   " step2: Move and Replace
+   let step= 1
+   while step <= 2
+"	call Decho("step#".step)
+
+	if step == 2
+	 if curcol < 2
+	  break
+	 endif
+"	 call Decho("move and replace: curchar<".curchar."> mode<".g:drawit_mode.">")
+     call s:MoveLeft()
+     norm! vy
+     let curchar= @@
+"     call Decho("curchar<".curchar.">")
+	else
+"	 call Decho("replace: curchar<".curchar."> mode<".g:drawit_mode.">")
+	endif
+
+	if s:IsDrawItH(curchar)
+     if g:drawit_mode == 'S'
+	  exe "norm! r".b:di_Splus
+	 elseif g:drawit_mode == 'D'
+	  exe "norm! r".b:di_Dplus
+     else
+	  exe "norm! r".b:di_plus
+     endif
+
+	else
+
+     if g:drawit_mode == 'S'
+	  exe "norm! r".b:di_Shoriz
+	 elseif g:drawit_mode == 'D'
+	  exe "norm! r".b:di_Dhoriz
+     else
+	  exe "norm! r".b:di_horiz
+     endif
+
+	endif
+	let step= step + 1
+   endwhile
+
+   norm! l
+   call s:DrawCorner()
+   norm! h
+   call s:DrawCorner()
+  endif
+  let @@= keepatat
+"  call Dret("s:DrawLeft")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawRight: {{{2
+fun! s:DrawRight()
+"  call Dfunc("s:DrawRight()")
+  let curline   = getline(".")
+  let curcol    = virtcol(".")
+  let b:lastdir = 1
+  let keepatat  = @@
+  norm! vy
+  let curchar= @@
+"  call Decho("curchar<".curchar.">")
+
+  " replace
+  if curcol == virtcol("$")
+   if g:drawit_mode == 'S'
+    exe "norm! a".b:di_Shoriz."\<Esc>"
+   elseif g:drawit_mode == 'D'
+    exe "norm! a".b:di_Dhoriz."\<Esc>"
+   else
+    exe "norm! a".b:di_horiz."\<Esc>"
+   endif
+  else
+   if s:IsDrawItH(curchar)
+    if g:drawit_mode == 'S'
+	 exe "norm! r".b:di_Splus
+	elseif g:drawit_mode == 'D'
+	 exe "norm! r".b:di_Dplus
+    else
+	 exe "norm! r".b:di_plus
+    endif
+   else
+    if g:drawit_mode == 'S'
+     exe "norm! r".b:di_Shoriz
+    elseif g:drawit_mode == 'D'
+     exe "norm! r".b:di_Dhoriz
+    else
+     exe "norm! r".b:di_horiz
+    endif
+   endif
+  endif
+
+  " move and replace
+  call s:MoveRight()
+  if curcol == virtcol("$")
+   if g:drawit_mode == 'S'
+    exe "norm! i".b:di_Shoriz."\<Esc>"
+   elseif g:drawit_mode == 'D'
+    exe "norm! i".b:di_Dhoriz."\<Esc>"
+   else
+    exe "norm! i".b:di_horiz."\<Esc>"
+   endif
+  else
+   norm! vy
+   let curchar= @@
+"   call Decho("curchar<".curchar.">")
+   if s:IsDrawItH(curchar)
+    if g:drawit_mode == 'S'
+	 exe "norm! r".b:di_Splus
+	elseif g:drawit_mode == 'D'
+	 exe "norm! r".b:di_Dplus
+    else
+	 exe "norm! r".b:di_plus
+    endif
+   else
+    if g:drawit_mode == 'S'
+     exe "norm! r".b:di_Shoriz
+    elseif g:drawit_mode == 'D'
+     exe "norm! r".b:di_Dhoriz
+    else
+     exe "norm! r".b:di_horiz
+    endif
+   endif
+  endif
+
+  norm! h
+  call s:DrawCorner()
+  norm! l
+  call s:DrawCorner()
+
+  let @@= keepatat
+"  call Dret("s:DrawRight")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawUp: {{{2
+fun! s:DrawUp()
+"  call Dfunc("s:DrawUp()")
+  let curline   = getline(".")
+  let curcol    = virtcol(".")
+  let b:lastdir = 3
+  let keepatat  = @@
+  norm! vy
+  let curchar   = @@
+"  call Decho("curchar<".curchar.">")
+
+  " replace
+  if curcol == 1 && virtcol("$") == 1
+"   call Decho("case curcol#".curcol."==virtcol($): insert")
+   if g:drawit_mode == 'S'
+    exe "norm! i".b:di_Svert."\<Esc>"
+   elseif g:drawit_mode == 'D'
+    exe "norm! i".b:di_Dvert."\<Esc>"
+   else
+    exe "norm! i".b:di_vert."\<Esc>"
+   endif
+  else
+"   call Decho("case curcol#".curcol."!=virtcol($) curchar<".curchar.">: replace")
+   if s:IsDrawItV(curchar)
+    if g:drawit_mode == 'S'
+     exe "norm! r".b:di_Splus
+    elseif g:drawit_mode == 'D'
+     exe "norm! r".b:di_Dplus
+    else
+     exe "norm! r".b:di_plus
+    endif
+   else
+    if g:drawit_mode == 'S'
+     exe "norm! r".b:di_Svert
+    elseif g:drawit_mode == 'D'
+     exe "norm! r".b:di_Dvert
+    else
+     exe "norm! r".b:di_vert
+    endif
+   endif
+  endif
+
+  " move and replace/insert
+  call s:MoveUp()
+  let curline= getline(".")
+"  let curchar= strpart(curline,curcol-1,1)
+  norm! vy
+  let curchar= @@
+
+  if     curcol == 1 && virtcol("$") == 1
+   if g:drawit_mode == 'S'
+    exe "norm! i".b:di_Svert."\<Esc>"
+   elseif g:drawit_mode == 'D'
+    exe "norm! i".b:di_Dvert."\<Esc>"
+   else
+    exe "norm! i".b:di_vert."\<Esc>"
+   endif
+  elseif s:IsDrawItV(curchar)
+    if g:drawit_mode == 'S'
+     exe "norm! r".b:di_Splus
+    elseif g:drawit_mode == 'D'
+     exe "norm! r".b:di_Dplus
+    else
+     exe "norm! r".b:di_plus
+    endif
+  else
+   if g:drawit_mode == 'S'
+    exe "norm! r".b:di_Svert
+   elseif g:drawit_mode == 'D'
+    exe "norm! r".b:di_Dvert
+   else
+    exe "norm! r".b:di_vert
+   endif
+
+  endif
+
+  norm! j
+  call s:DrawCorner()
+  norm! k
+  call s:DrawCorner()
+
+  let @@= keepatat
+"  call Dret("s:DrawUp")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawDown: {{{2
+fun! s:DrawDown()
+"  call Dfunc("s:DrawDown()")
+  let curline   = getline(".")
+  let curcol    = virtcol(".")
+  let keepatat  = @@
+  norm! vy
+  let curchar   = @@
+"  call Decho("curchar<".curchar.">")
+  let b:lastdir = 4
+
+  " replace
+  if curcol == 1 && virtcol("$") == 1
+"   call Decho("curcol=".curcol." $=1"
+   if g:drawit_mode == 'S'
+    exe "norm! i".b:di_Svert."\<Esc>"
+   elseif g:drawit_mode == 'D'
+    exe "norm! i".b:di_Dvert."\<Esc>"
+   else
+    exe "norm! i".b:di_vert."\<Esc>"
+   endif
+  else
+    norm! vy
+    let curchar= @@
+"    call Decho("curchar<".curchar.">")
+	if s:IsDrawItV(curchar)
+    if g:drawit_mode == 'S'
+     exe "norm! r".b:di_Splus
+    elseif g:drawit_mode == 'D'
+     exe "norm! r".b:di_Dplus
+    else
+     exe "norm! r".b:di_plus
+    endif
+   else
+    if g:drawit_mode == 'S'
+     exe "norm! r".b:di_Svert
+    elseif g:drawit_mode == 'D'
+     exe "norm! r".b:di_Dvert
+    else
+     exe "norm! r".b:di_vert
+    endif
+   endif
+  endif
+
+  " move and replace/insert
+  call s:MoveDown()
+  let curline= getline(".")
+  norm! vy
+  let curchar= @@
+"  call Decho("curchar<".curchar.">")
+  if     curcol == 1 && virtcol("$") == 1
+   if g:drawit_mode == 'S'
+    exe "norm! i".b:di_Svert."\<Esc>"
+   elseif g:drawit_mode == 'D'
+    exe "norm! i".b:di_Dvert."\<Esc>"
+   else
+    exe "norm! i".b:di_vert."\<Esc>"
+   endif
+  elseif s:IsDrawItV(curchar)
+    if g:drawit_mode == 'S'
+     exe "norm! r".b:di_Splus
+    elseif g:drawit_mode == 'D'
+     exe "norm! r".b:di_Dplus
+    else
+     exe "norm! r".b:di_plus
+    endif
+  else
+   if g:drawit_mode == 'S'
+    exe "norm! r".b:di_Svert
+   elseif g:drawit_mode == 'D'
+    exe "norm! r".b:di_Dvert
+   else
+    exe "norm! r".b:di_vert
+   endif
+
+  endif
+
+  norm! k
+  call s:DrawCorner()
+  norm! j
+  call s:DrawCorner()
+
+  let @@= keepatat
+"  call Dret("s:DrawDown")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawCorner: change a ┼ or a ╬ into an appropriate corner {{{2
+fun! s:DrawCorner()
+"  call Dfunc("s:DrawCorner()")
+  let keepatat= @@
+  norm! vy
+  let ctr= @@
+  if ctr != b:di_Splus   && ctr != b:di_Dplus
+   let @@= keepatat
+"   call Dret("s:DrawCorner : ctr<".ctr.">  (quick return)")
+   return
+  endif
+
+  " cleft: Grab a copy of the character to the left of the cursor
+  if virtcol(".") > 1
+   norm! hvyl
+   let cleft= @@
+  else
+   let cleft= " "
+  endif
+
+  " cright: Grab a copy of the character to the right of the cursor
+  if virtcol(".") < virtcol("$")
+   norm! lvyh
+   let cright= @@
+  else
+   let cright= " "
+  endif
+
+  " cup: Grab a copy of the character above the cursor
+  if line(".") > 1
+   norm! kvyj
+   let cup= @@
+  else
+   let cup= " "
+  endif
+  
+  " cdown: Grab a copy of the character below the cursor
+  if line(".") < line("$")
+   norm! jvyk
+   let cdown= @@
+  else
+   let cdown= " "
+  endif
+"  call Decho("ctr<".ctr."> cup<".cup."> cright<".cright."> cdown<".cdown."> cleft<".cleft.">")
+  " - MIXED SINGLE-DOUBLE CORNERS ----------------------------------------
+  "   ┼═   ╬═      ╒═
+  "   │    │       │
+  if  !s:IsDnS(cup)
+ \ &&  s:IsLeftD(cright)
+ \ &&  s:IsUpS(cdown)
+ \ && !s:IsRightD(cleft)
+   exe "norm! r".b:di_cSdDr
+
+  "   ┼─   ╬─      ╓─
+  "   ║    ║       ║
+  elseif  !s:IsDnD(cup)
+ \ &&      s:IsLeftS(cright)
+ \ &&      s:IsUpD(cdown)
+ \ &&     !s:IsRightS(cleft)
+   exe "norm! r".b:di_cDdSr
+
+  "  ═┼   ═╬      ═╕
+  "   │    │       │
+  elseif  !s:IsDnS(cup)
+ \ &&     !s:IsLeftD(cright)
+ \ &&      s:IsUpS(cdown)
+ \ &&      s:IsRightD(cleft)
+   exe "norm! r".b:di_cDlSd
+
+  "  ─┼   ─╬      ─╖
+  "   ║    ║       ║
+  elseif  !s:IsDnD(cup)
+ \ &&     !s:IsLeftS(cright)
+ \ &&      s:IsUpD(cdown)
+ \ &&      s:IsRightS(cleft)
+   exe "norm! r".b:di_cSlDd
+
+  "   │    │       │
+  "   ┼═   ╬═      ╘═
+  elseif   s:IsDnS(cup)
+ \ &&      s:IsLeftD(cright)
+ \ &&     !s:IsUpS(cdown)
+ \ &&     !s:IsRightD(cleft)
+   exe "norm! r".b:di_cDrSu
+
+  "   ║    ║       ║
+  "   ┼─   ╬─      ╙─
+  elseif   s:IsDnD(cup)
+ \ &&      s:IsLeftS(cright)
+ \ &&     !s:IsUpD(cdown)
+ \ &&     !s:IsRightS(cleft)
+   exe "norm! r".b:di_cSrDu
+
+  "   │    │       │
+  "  ═┼   ═╬      ═╛
+  elseif   s:IsDnS(cup)
+ \ &&     !s:IsLeftD(cright)
+ \ &&     !s:IsUpS(cdown)
+ \ &&      s:IsRightD(cleft)
+   exe "norm! r".b:di_cDlSu
+
+  "   ║    ║       ║
+  "  ─┼   ─╬      ─╜
+  elseif   s:IsDnD(cup)
+ \ &&     !s:IsLeftS(cright)
+ \ &&     !s:IsUpD(cdown)
+ \ &&      s:IsRightS(cleft)
+   exe "norm! r".b:di_cSlDu
+
+  " - SINGLE LINE --------------------------------------------------------
+ elseif ctr == b:di_Splus
+   "   ─┼  ─┐
+   "    │   │
+   if  !s:IsDnS(cup)
+  \ && !s:IsLeftS(cright)
+  \ &&  s:IsUpS(cdown)
+  \ &&  s:IsRightS(cleft)
+    exe "norm! r".b:di_Surcorn
+
+   "    ┼─  ┌─
+   "    │   │
+   elseif !s:IsDnS(cup)
+  \    &&  s:IsLeftS(cright)
+  \    &&  s:IsUpS(cdown)
+  \    && !s:IsRightS(cleft)
+    exe "norm! r".b:di_Sulcorn
+
+   "    │   │
+   "   ─┼  ─┘
+   elseif  s:IsDnS(cup)
+  \    && !s:IsLeftS(cright)
+  \    && !s:IsUpS(cdown)
+  \    &&  s:IsRightS(cleft)
+    exe "norm! r".b:di_Slrcorn
+
+   "   │   │
+   "   ┼─  └─
+   elseif  s:IsDnS(cup)
+  \    &&  s:IsLeftS(cright)
+  \    && !s:IsUpS(cdown)
+  \    && !s:IsRightS(cleft)
+    exe "norm! r".b:di_Sllcorn
+
+   "   │   │
+   "   ┼─  ├─
+   "   │   │
+   elseif  s:IsDnS(cup)
+  \    &&  s:IsLeftS(cright)
+  \    &&  s:IsUpS(cdown)
+  \    && !s:IsRightS(cleft)
+    exe "norm! r".b:di_Srplus
+
+   "   │   │
+   "  ─┼  ─┤
+   "   │   │
+   elseif  s:IsDnS(cup)
+  \    && !s:IsLeftS(cright)
+  \    &&  s:IsUpS(cdown)
+  \    &&  s:IsRightS(cleft)
+    exe "norm! r".b:di_Slplus
+
+   "  ─┼─   ─┬─
+   "   │     │ 
+   elseif !s:IsDnS(cup)
+  \    &&  s:IsLeftS(cright)
+  \    &&  s:IsUpS(cdown)
+  \    &&  s:IsRightS(cleft)
+	exe "norm! r".b:di_Sdnplus
+
+   "  ─┼─   ─╥─
+   "   ║     ║ 
+   elseif !s:IsDnD(cup)
+  \    &&  s:IsLeftS(cright)
+  \    &&  s:IsUpD(cdown)
+  \    &&  s:IsRightS(cleft)
+	exe "norm! r".b:di_ShDd
+
+   "   ║     ║ 
+   "  ─┼─   ─╨─
+   elseif  s:IsDnD(cup)
+  \    &&  s:IsLeftS(cright)
+  \    && !s:IsUpD(cdown)
+  \    &&  s:IsRightS(cleft)
+	exe "norm! r".b:di_ShDu
+
+   "   │     │ 
+   "  ─┼─   ─┴─
+   elseif  s:IsDnS(cup)
+  \    &&  s:IsLeftS(cright)
+  \    && !s:IsUpS(cdown)
+  \    &&  s:IsRightS(cleft)
+	exe "norm! r".b:di_Supplus
+
+   "   ║     ║ 
+   "   ┼─    ╟─
+   "   ║     ║ 
+   elseif  s:IsDnD(cup)
+  \    &&  s:IsLeftS(cright)
+  \    &&  s:IsUpD(cdown)
+  \    && !s:IsRightS(cleft)
+	exe "norm! r".b:di_DuSr
+
+   "   ║     ║ 
+   "  ─┼    ─╢
+   "   ║     ║ 
+   elseif  s:IsDnD(cup)
+  \    && !s:IsLeftS(cright)
+  \    &&  s:IsUpD(cdown)
+  \    &&  s:IsRightS(cleft)
+	exe "norm! r".b:di_DuSl
+
+   "   │   │
+   "   ┼═  ╞═
+   "   │   │
+   elseif  s:IsDnS(cup)
+  \    &&  s:IsLeftD(cright)
+  \    &&  s:IsUpS(cdown)
+  \    && !s:IsRightD(cleft)
+    exe "norm! r".b:di_SuDr
+
+   "   │   │
+   "  ═┼  ═╡
+   "   │   │
+   elseif  s:IsDnS(cup)
+  \    && !s:IsLeftD(cright)
+  \    &&  s:IsUpS(cdown)
+  \    &&  s:IsRightD(cleft)
+    exe "norm! r".b:di_SuDl
+
+   "  ═┼═   ═╤═
+   "   │     │ 
+   elseif !s:IsDnS(cup)
+  \    &&  s:IsLeftD(cright)
+  \    &&  s:IsUpS(cdown)
+  \    &&  s:IsRightD(cleft)
+	exe "norm! r".b:di_DhSd
+
+   "   │     │ 
+   "  ═┼═   ═╧═
+   elseif  s:IsDnS(cup)
+  \    &&  s:IsLeftD(cright)
+  \    && !s:IsUpS(cdown)
+  \    &&  s:IsRightD(cleft)
+	exe "norm! r".b:di_DhSu
+
+   "   ║     ║ 
+   "  ─┼─   ─╫─
+   "   ║     ║ 
+   elseif  s:IsDnD(cup)
+  \    &&  s:IsLeftS(cright)
+  \    &&  s:IsUpD(cdown)
+  \    &&  s:IsRightS(cleft)
+	exe "norm! r".b:di_DuSlr
+
+   "   │     │ 
+   "  ═┼═   ═╪═
+   "   │     │ 
+   elseif  s:IsDnS(cup)
+  \    &&  s:IsLeftD(cright)
+  \    &&  s:IsUpS(cdown)
+  \    &&  s:IsRightD(cleft)
+	exe "norm! r".b:di_SuDlr
+   endif
+
+  " - DOUBLE LINE --------------------------------------------------------
+  elseif ctr == b:di_Dplus
+   "   ═╬  ═╗
+   "    ║   ║
+   if  !s:IsDnD(cup)
+  \ && !s:IsLeftD(cright)
+  \ &&  s:IsUpD(cdown)
+  \ &&  s:IsRightD(cleft)
+    exe "norm! r".b:di_Durcorn
+
+   "    ╬═  ╔═
+   "    ║   ║
+   elseif !s:IsDnD(cup)
+  \    &&  s:IsLeftD(cright)
+  \    &&  s:IsUpD(cdown)
+  \    && !s:IsRightD(cleft)
+    exe "norm! r".b:di_Dulcorn
+
+   "    ║   ║
+   "   ═╬  ═╝
+   elseif  s:IsDnD(cup)
+  \    && !s:IsLeftD(cright)
+  \    && !s:IsUpD(cdown)
+  \    &&  s:IsRightD(cleft)
+    exe "norm! r".b:di_Dlrcorn
+
+   "   ║   ║
+   "   ╬═  ╚═
+   elseif  s:IsDnD(cup)
+  \    &&  s:IsLeftD(cright)
+  \    && !s:IsUpD(cdown)
+  \    && !s:IsRightD(cleft)
+    exe "norm! r".b:di_Dllcorn
+
+   "   ║   ║
+   "   ╬═  ╠═
+   "   ║   ║
+   elseif  s:IsDnD(cup)
+  \    &&  s:IsLeftD(cright)
+  \    &&  s:IsUpD(cdown)
+  \    && !s:IsRightD(cleft)
+    exe "norm! r".b:di_Drplus
+
+   "   ║   ║
+   "  ═╬  ═╣
+   "   ║   ║
+   elseif  s:IsDnD(cup)
+  \    && !s:IsLeftD(cright)
+  \    &&  s:IsUpD(cdown)
+  \    &&  s:IsRightD(cleft)
+    exe "norm! r".b:di_Dlplus
+
+   "   ║   ║
+   "  ─╬  ─╢
+   "   ║   ║
+   elseif  s:IsDnD(cup)
+  \    && !s:IsLeftD(cright)
+  \    &&  s:IsUpD(cdown)
+  \    &&  s:IsRightS(cleft)
+    exe "norm! r".b:di_DuSl
+
+   "   ║   ║
+   "   ╬─  ╟─
+   "   ║   ║
+   elseif  s:IsDnD(cup)
+  \    &&  s:IsLeftS(cright)
+  \    &&  s:IsUpD(cdown)
+  \    && !s:IsRightD(cleft)
+    exe "norm! r".b:di_DuSr
+
+   "  ═╬═   ═╦═
+   "   ║     ║ 
+   elseif !s:IsDnD(cup)
+  \    &&  s:IsLeftD(cright)
+  \    &&  s:IsUpD(cdown)
+  \    &&  s:IsRightD(cleft)
+	exe "norm! r".b:di_Ddnplus
+
+   "   ║     ║ 
+   "  ═╬═   ═╩═
+   elseif  s:IsDnD(cup)
+  \    &&  s:IsLeftD(cright)
+  \    && !s:IsUpD(cdown)
+  \    &&  s:IsRightD(cleft)
+	exe "norm! r".b:di_Dupplus
+
+   "   │     │ 
+   "   ╬═    ╞═
+   "   │     │ 
+   elseif  s:IsDnS(cup)
+  \    &&  s:IsLeftD(cright)
+  \    &&  s:IsUpS(cdown)
+  \    && !s:IsRightD(cleft)
+	exe "norm! r".b:di_SuDr
+
+   "   │     │ 
+   "  ═╬    ═╡
+   "   │     │ 
+   elseif  s:IsDnS(cup)
+  \    && !s:IsLeftD(cright)
+  \    &&  s:IsUpS(cdown)
+  \    &&  s:IsRightD(cleft)
+	exe "norm! r".b:di_SuDl
+
+   "  ─╬─   ─╥─
+   "   ║     ║ 
+   elseif !s:IsDnD(cup)
+  \    &&  s:IsLeftS(cright)
+  \    &&  s:IsUpD(cdown)
+  \    &&  s:IsRightS(cleft)
+	exe "norm! r".b:di_ShDd
+
+   "   ║     ║ 
+   "  ─╬─   ─╨─
+   elseif  s:IsDnD(cup)
+  \    &&  s:IsLeftS(cright)
+  \    && !s:IsUpD(cdown)
+  \    &&  s:IsRightS(cleft)
+	exe "norm! r".b:di_ShDu
+
+   "   │     │ 
+   "  ═╬═   ═╪═
+   "   │     │ 
+   elseif  s:IsDnS(cup)
+  \    &&  s:IsLeftD(cright)
+  \    &&  s:IsUpS(cdown)
+  \    &&  s:IsRightD(cleft)
+	exe "norm! r".b:di_SuDlr
+
+   "   │     │ 
+   "  ═╬═   ═╨═
+   elseif  s:IsDnS(cup)
+  \    &&  s:IsLeftD(cright)
+  \    && !s:IsUpS(cdown)
+  \    &&  s:IsRightD(cleft)
+    exe "norm! r".b:di_SuDh
+
+   "  ═╬═   ═╤═
+   "   │     │ 
+   elseif !s:IsDnS(cup)
+  \    &&  s:IsLeftD(cright)
+  \    &&  s:IsUpS(cdown)
+  \    &&  s:IsRightD(cleft)
+    exe "norm! r".b:di_SdDh
+
+   "   ║     ║ 
+   "  ─╬─   ─╫─
+   "   ║     ║ 
+   elseif  s:IsDnD(cup)
+  \    &&  s:IsLeftS(cright)
+  \    &&  s:IsUpD(cdown)
+  \    &&  s:IsRightS(cleft)
+	exe "norm! r".b:di_DuSlr
+   endif
+
+  endif
+
+  norm! vy
+  let newctr= @@
+  let @@= keepatat
+"  call Dret("s:DrawCorner : ".((newctr != ctr)? "newctr<".newctr.">" : "unchanged"))
+endfun
+
+" ---------------------------------------------------------------------
+" s:IsDrawItH: moving horizontally {{{2
+fun! s:IsDrawItH(chr)
+"  call Dfunc("s:IsDrawItH(chr<".a:chr.">)")
+   if a:chr == b:di_vert     || a:chr == b:di_plus
+"    call Dret("s:IsDrawItH 1")
+    return 1
+   endif
+   if b:di_gfxchr == 0
+"    call Dret("s:IsDrawItH 0")
+    return 0
+   endif
+   if  a:chr == b:di_Svert   || a:chr == b:di_Dvert
+  \ || a:chr == b:di_Splus   || a:chr == b:di_Dplus
+  \ || a:chr == b:di_Surcorn || a:chr == b:di_Durcorn
+  \ || a:chr == b:di_Slrcorn || a:chr == b:di_Dlrcorn
+  \ || a:chr == b:di_Sllcorn || a:chr == b:di_Dllcorn
+  \ || a:chr == b:di_Sulcorn || a:chr == b:di_Dulcorn
+  \ || a:chr == b:di_Sdnplus || a:chr == b:di_Ddnplus
+  \ || a:chr == b:di_Supplus || a:chr == b:di_Dupplus
+  \ || a:chr == b:di_Srplus  || a:chr == b:di_Drplus
+  \ || a:chr == b:di_Slplus  || a:chr == b:di_Dlplus
+  \ || a:chr == b:di_DhSd    || a:chr == b:di_DhSu
+  \ || a:chr == b:di_DuSl    || a:chr == b:di_DuSr
+  \ || a:chr == b:di_ShDd    || a:chr == b:di_ShDu
+  \ || a:chr == b:di_SuDl    || a:chr == b:di_SuDr
+  \ || a:chr == b:di_DuSlr   || a:chr == b:di_SuDlr
+  \ || a:chr == b:di_cSdDr   || a:chr == b:di_cSdDr
+  \ || a:chr == b:di_cDdSr   || a:chr == b:di_cDdSr
+  \ || a:chr == b:di_cDlSd   || a:chr == b:di_cDlSd
+  \ || a:chr == b:di_cSlDd   || a:chr == b:di_cSlDd
+  \ || a:chr == b:di_cDrSu   || a:chr == b:di_cDrSu
+  \ || a:chr == b:di_cSrDu   || a:chr == b:di_cSrDu
+  \ || a:chr == b:di_cDlSu   || a:chr == b:di_cDlSu
+  \ || a:chr == b:di_cSlDu   || a:chr == b:di_cSlDu
+"   call Dret("s:IsDrawItH 1")
+   return 1
+  endif
+"  call Dret("s:IsDrawItH 0")
+  return 0
+endfun
+
+" ---------------------------------------------------------------------
+" s:IsDrawItV: moving vertically  {{{2
+fun! s:IsDrawItV(chr)
+"  call Dfunc("s:IsDrawItV(chr<".a:chr.">)")
+   if a:chr == b:di_horiz   || a:chr == b:di_plus
+"    call Dret("s:IsDrawItH 1")
+    return 1
+   endif
+   if b:di_gfxchr == 0
+"    call Dret("s:IsDrawItH 0")
+    return 0
+   endif
+   if  a:chr == b:di_Shoriz  || a:chr == b:di_Dhoriz
+  \ || a:chr == b:di_Splus   || a:chr == b:di_Dplus
+  \ || a:chr == b:di_Surcorn || a:chr == b:di_Durcorn
+  \ || a:chr == b:di_Slrcorn || a:chr == b:di_Dlrcorn
+  \ || a:chr == b:di_Sllcorn || a:chr == b:di_Dllcorn
+  \ || a:chr == b:di_Sulcorn || a:chr == b:di_Dulcorn
+  \ || a:chr == b:di_Sdnplus || a:chr == b:di_Ddnplus
+  \ || a:chr == b:di_Supplus || a:chr == b:di_Dupplus
+  \ || a:chr == b:di_Srplus  || a:chr == b:di_Drplus
+  \ || a:chr == b:di_Slplus  || a:chr == b:di_Dlplus
+  \ || a:chr == b:di_DhSd    || a:chr == b:di_DhSu
+  \ || a:chr == b:di_DuSl    || a:chr == b:di_DuSr
+  \ || a:chr == b:di_ShDd    || a:chr == b:di_ShDu
+  \ || a:chr == b:di_SuDl    || a:chr == b:di_SuDr
+  \ || a:chr == b:di_DuSlr   || a:chr == b:di_SuDlr
+  \ || a:chr == b:di_cSdDr   || a:chr == b:di_cSdDr
+  \ || a:chr == b:di_cDdSr   || a:chr == b:di_cDdSr
+  \ || a:chr == b:di_cDlSd   || a:chr == b:di_cDlSd
+  \ || a:chr == b:di_cSlDd   || a:chr == b:di_cSlDd
+  \ || a:chr == b:di_cDrSu   || a:chr == b:di_cDrSu
+  \ || a:chr == b:di_cSrDu   || a:chr == b:di_cSrDu
+  \ || a:chr == b:di_cDlSu   || a:chr == b:di_cDlSu
+  \ || a:chr == b:di_cSlDu   || a:chr == b:di_cSlDu
+"   call Dret("s:IsDrawItV 1")
+   return 1
+  endif
+"  call Dret("s:IsDrawItV 0")
+  return 0
+endfun
+
+" ---------------------------------------------------------------------
+" s:IsDnS: does the character "chr" have a single-line vertical-down? {{{2
+fun! s:IsDnS(chr)
+"  call Dfunc("s:IsDnS(chr<".a:chr.">)")
+  let ret= 0
+  if b:di_gfxchr
+   if     a:chr == b:di_Svert  |let ret= 1
+   elseif a:chr == b:di_Sulcorn|let ret= 1
+   elseif a:chr == b:di_Surcorn|let ret= 1
+   elseif a:chr == b:di_Splus  |let ret= 1
+   elseif a:chr == b:di_Sdnplus|let ret= 1
+   elseif a:chr == b:di_Slplus |let ret= 1
+   elseif a:chr == b:di_Srplus |let ret= 1
+   elseif a:chr == b:di_SdDh   |let ret= 1
+   elseif a:chr == b:di_cDlSd  |let ret= 1
+   elseif a:chr == b:di_cSdDr  |let ret= 1
+   endif
+  endif
+"  call Dret("s:IsDnS ".ret)
+  return ret
+endfun
+
+" ---------------------------------------------------------------------
+" s:IsDnD: does the character "chr" have a double-line vertical-down? {{{2
+fun! s:IsDnD(chr)
+"  call Dfunc("s:IsDnD(chr<".a:chr.">)")
+  let ret= 0
+  if b:di_gfxchr
+   if     a:chr == b:di_Dvert  |let ret= 1
+   elseif a:chr == b:di_Dulcorn|let ret= 1
+   elseif a:chr == b:di_Durcorn|let ret= 1
+   elseif a:chr == b:di_Dplus  |let ret= 1
+   elseif a:chr == b:di_Ddnplus|let ret= 1
+   elseif a:chr == b:di_Dlplus |let ret= 1
+   elseif a:chr == b:di_Drplus |let ret= 1
+   elseif a:chr == b:di_cDdSr  |let ret= 1
+   elseif a:chr == b:di_cSlDd  |let ret= 1
+   endif
+  endif
+"   call Dret("s:IsDnD ".ret)
+  return ret
+endfun
+
+" ---------------------------------------------------------------------
+" s:IsUpS: does the character "chr" have a single-line vertical-up? {{{2
+fun! s:IsUpS(chr)
+"  call Dfunc("s:IsUpS(chr<".a:chr.">)")
+  let ret= 0
+  if b:di_gfxchr
+   if     a:chr == b:di_Svert  |let ret= 1
+   elseif a:chr == b:di_Sllcorn|let ret= 1
+   elseif a:chr == b:di_Slrcorn|let ret= 1
+   elseif a:chr == b:di_Splus  |let ret= 1
+   elseif a:chr == b:di_Supplus|let ret= 1
+   elseif a:chr == b:di_Slplus |let ret= 1
+   elseif a:chr == b:di_Srplus |let ret= 1
+   elseif a:chr == b:di_SuDh   |let ret= 1
+   elseif a:chr == b:di_cDrSu  |let ret= 1
+   elseif a:chr == b:di_cDlSu  |let ret= 1
+   endif
+  endif
+"   call Dret("s:IsUpS ".ret)
+  return ret
+endfun
+
+" ---------------------------------------------------------------------
+" s:IsUpD: does the character "chr" have a double-line vertical-up? {{{2
+fun! s:IsUpD(chr)
+"  call Dfunc("s:IsUpD(chr<".a:chr.">)")
+  let ret= 0
+  if b:di_gfxchr
+   if     a:chr == b:di_Dvert  |let ret= 1
+   elseif a:chr == b:di_Dllcorn|let ret= 1
+   elseif a:chr == b:di_Dlrcorn|let ret= 1
+   elseif a:chr == b:di_Dplus  |let ret= 1
+   elseif a:chr == b:di_Dupplus|let ret= 1
+   elseif a:chr == b:di_Dlplus |let ret= 1
+   elseif a:chr == b:di_Drplus |let ret= 1
+   elseif a:chr == b:di_cSrDu  |let ret= 1
+   elseif a:chr == b:di_cSlDu  |let ret= 1
+   endif
+  endif
+"  call Dret("s:IsUpD ".ret)
+  return ret
+endfun
+
+" ---------------------------------------------------------------------
+" s:IsLeftS: does the character "chr" have a single-line horizontal-left? {{{2
+fun! s:IsLeftS(chr)
+"  call Dfunc("s:IsLeftS(chr<".a:chr.">)")
+  let ret= 0
+  if b:di_gfxchr
+   if     a:chr == b:di_Shoriz  |let ret= 1
+   elseif a:chr == b:di_Surcorn |let ret= 1
+   elseif a:chr == b:di_Slrcorn |let ret= 1
+   elseif a:chr == b:di_Splus   |let ret= 1
+   elseif a:chr == b:di_Sdnplus |let ret= 1
+   elseif a:chr == b:di_Supplus |let ret= 1
+   elseif a:chr == b:di_Slplus  |let ret= 1
+   elseif a:chr == b:di_cSlDd   |let ret= 1
+   elseif a:chr == b:di_cSlDu   |let ret= 1
+   endif
+  endif
+"  call Dret("s:IsLeftS ".ret)
+  return ret
+endfun
+
+" ---------------------------------------------------------------------
+" s:IsLeftD: does the character "chr" have a double-line horizontal-left? {{{2
+fun! s:IsLeftD(chr)
+"  call Dfunc("s:IsLeftD(chr<".a:chr.">)")
+  let ret= 0
+  if b:di_gfxchr
+   if     a:chr == b:di_Dhoriz  |let ret= 1
+   elseif a:chr == b:di_Durcorn |let ret= 1
+   elseif a:chr == b:di_Dlrcorn |let ret= 1
+   elseif a:chr == b:di_Dplus   |let ret= 1
+   elseif a:chr == b:di_Ddnplus |let ret= 1
+   elseif a:chr == b:di_Dupplus |let ret= 1
+   elseif a:chr == b:di_Dlplus  |let ret= 1
+   elseif a:chr == b:di_cDlSd   |let ret= 1
+   elseif a:chr == b:di_cDlSu   |let ret= 1
+   endif
+  endif
+"  call Dret("s:IsLeftD ".ret)
+  return ret
+endfun
+
+" ---------------------------------------------------------------------
+" s:IsRightS: does the character "chr" have a single-line horizontal-right? {{{2
+fun! s:IsRightS(chr)
+"  call Dfunc("s:IsRightS(chr<".a:chr.">)")
+  let ret= 0
+  if b:di_gfxchr
+   if     a:chr == b:di_Shoriz  |let ret= 1
+   elseif a:chr == b:di_Sulcorn |let ret= 1
+   elseif a:chr == b:di_Sllcorn |let ret= 1
+   elseif a:chr == b:di_Splus   |let ret= 1
+   elseif a:chr == b:di_Sdnplus |let ret= 1
+   elseif a:chr == b:di_Supplus |let ret= 1
+   elseif a:chr == b:di_Srplus  |let ret= 1
+   elseif a:chr == b:di_cDdSr   |let ret= 1
+   elseif a:chr == b:di_cSrDu   |let ret= 1
+   endif
+  endif
+"  call Dret("s:IsRightS ".ret)
+  return ret
+endfun
+
+" ---------------------------------------------------------------------
+" s:IsRightD: does the character "chr" have a double-line horizontal-right? {{{2
+fun! s:IsRightD(chr)
+"  call Dfunc("s:IsRightD(chr<".a:chr.">)")
+  let ret= 0
+  if b:di_gfxchr
+   if     a:chr == b:di_Dhoriz  |let ret= 1
+   elseif a:chr == b:di_Dulcorn |let ret= 1
+   elseif a:chr == b:di_Dllcorn |let ret= 1
+   elseif a:chr == b:di_Dplus   |let ret= 1
+   elseif a:chr == b:di_Ddnplus |let ret= 1
+   elseif a:chr == b:di_Dupplus |let ret= 1
+   elseif a:chr == b:di_Drplus  |let ret= 1
+   elseif a:chr == b:di_cSdDr   |let ret= 1
+   elseif a:chr == b:di_cDrSu   |let ret= 1
+   endif
+  endif
+"  call Dret("s:IsRightD ".ret)
+  return ret
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawErase: toggle [DrawIt on] and [DrawIt erase] modes {{{2
+fun! s:DrawErase()
+"  call Dfunc("s:DrawErase() b:di_erase=".b:di_erase)
+  if b:di_erase == 0
+   let b:di_erase= 1
+   echo "[DrawIt erase]"
+   let b:di_vert_save    = b:di_vert
+   let b:di_horiz_save   = b:di_horiz
+   let b:di_plus_save    = b:di_plus
+   let b:di_upright_save = b:di_upright
+   let b:di_upleft_save  = b:di_upleft
+   let b:di_cross_save   = b:di_cross
+   let b:di_ellipse_save = b:di_ellipse
+   call SetDrawIt(' ',' ',' ',' ',' ',' ',' ')
+  else
+   let b:di_erase= 0
+   echo "[DrawIt]"
+   call SetDrawIt(b:di_vert_save,b:di_horiz_save,b:di_plus_save,b:di_upleft_save,b:di_upright_save,b:di_cross_save,b:di_ellipse_save)
+  endif
+"  call Dret("s:DrawErase")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawSpace: clear character and move right {{{2
+fun! s:DrawSpace(chr,dir)
+"  call Dfunc("s:DrawSpace(chr<".a:chr."> dir<".a:dir.">)")
+  let curcol= virtcol(".")
+
+  " replace current location with arrowhead/space
+  if curcol == virtcol("$")-1
+   exe "norm! r".a:chr
+  else
+   exe "norm! r".a:chr
+  endif
+
+  if a:dir == 0
+   let dir= b:lastdir
+  else
+   let dir= a:dir
+  endif
+
+  " perform specified move
+  if dir == 1
+   call s:MoveRight()
+  elseif dir == 2
+   call s:MoveLeft()
+  elseif dir == 3
+   call s:MoveUp()
+  else
+   call s:MoveDown()
+  endif
+"  call Dret("s:DrawSpace")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawSlantDownLeft: / {{{2
+fun! s:DrawSlantDownLeft()
+"  call Dfunc("s:DrawSlantDownLeft()")
+  call s:ReplaceDownLeft()		" replace
+  call s:MoveDown()				" move
+  call s:MoveLeft()				" move
+  call s:ReplaceDownLeft()		" replace
+"  call Dret("s:DrawSlantDownLeft")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawSlantDownRight: \ {{{2
+fun! s:DrawSlantDownRight()
+"  call Dfunc("s:DrawSlantDownRight()")
+  call s:ReplaceDownRight()	" replace
+  call s:MoveDown()			" move
+  call s:MoveRight()		" move
+  call s:ReplaceDownRight()	" replace
+"  call Dret("s:DrawSlantDownRight")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawSlantUpLeft: \ {{{2
+fun! s:DrawSlantUpLeft()
+"  call Dfunc("s:DrawSlantUpLeft()")
+  call s:ReplaceDownRight()	" replace
+  call s:MoveUp()			" move
+  call s:MoveLeft()			" move
+  call s:ReplaceDownRight()	" replace
+"  call Dret("s:DrawSlantUpLeft")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawSlantUpRight: / {{{2
+fun! s:DrawSlantUpRight()
+"  call Dfunc("s:DrawSlantUpRight()")
+  call s:ReplaceDownLeft()	" replace
+  call s:MoveUp()			" move
+  call s:MoveRight()		" replace
+  call s:ReplaceDownLeft()	" replace
+"  call Dret("s:DrawSlantUpRight")
+endfun
+
+" ---------------------------------------------------------------------
+" s:MoveLeft: {{{2
+fun! s:MoveLeft()
+"  call Dfunc("s:MoveLeft()")
+  norm! h
+  let b:lastdir= 2
+"  call Dret("s:MoveLeft : b:lastdir=".b:lastdir)
+endfun
+
+" ---------------------------------------------------------------------
+" s:MoveRight: {{{2
+fun! s:MoveRight()
+"  call Dfunc("s:MoveRight()")
+  if virtcol(".") >= virtcol("$") - 1
+   exe "norm! A \<Esc>"
+  else
+   norm! l
+  endif
+  let b:lastdir= 1
+"  call Dret("s:MoveRight : b:lastdir=".b:lastdir)
+endfun
+
+" ---------------------------------------------------------------------
+" s:MoveUp: {{{2
+fun! s:MoveUp()
+"  call Dfunc("s:MoveUp()")
+  if line(".") == 1
+   let curcol= virtcol(".") - 1
+   if curcol == 0 && virtcol("$") == 1
+     exe "norm! i \<Esc>"
+   elseif curcol == 0
+     exe "norm! YP:s/./ /ge\<CR>0r "
+   else
+     exe "norm! YP:s/./ /ge\<CR>0".curcol."lr "
+   endif
+  else
+   let curcol= virtcol(".")
+   norm! k
+   while virtcol("$") <= curcol
+     exe "norm! A \<Esc>"
+   endwhile
+  endif
+  let b:lastdir= 3
+"  call Dret("s:MoveUp : b:lastdir=".b:lastdir)
+endfun
+
+" ---------------------------------------------------------------------
+" s:MoveDown: {{{2
+fun! s:MoveDown()
+"  call Dfunc("s:MoveDown()")
+  if line(".") == line("$")
+   let curcol= virtcol(".") - 1
+   if curcol == 0 && virtcol("$") == 1
+    exe "norm! i \<Esc>"
+   elseif curcol == 0
+    exe "norm! Yp:s/./ /ge\<CR>0r "
+   else
+    exe "norm! Yp:s/./ /ge\<CR>0".curcol."lr "
+   endif
+  else
+   let curcol= virtcol(".")
+   norm! j
+   while virtcol("$") <= curcol
+    exe "norm! A \<Esc>"
+   endwhile
+  endif
+  let b:lastdir= 4
+"  call Dret("s:MoveDown : b:lastdir=".b:lastdir)
+endfun
+
+" ---------------------------------------------------------------------
+" s:ReplaceDownLeft: / X  (upright) {{{2
+fun! s:ReplaceDownLeft()
+"  call Dfunc("s:ReplaceDownLeft()")
+  let curcol   = virtcol(".")
+  let keepatat = @@
+  if curcol != virtcol("$")
+   norm! vy
+   let curchar= @@
+
+   " determine if curchr needs to be changed to an "X"
+   let chg2cross = 0
+   if curchar == b:di_upleft   || curchar == b:di_cross
+    let chg2cross = 1
+   elseif b:di_gfxchr
+	" performing following test only if gfx drawing characters exist
+    if curchar == b:di_Supleft || curchar == b:di_Scross
+     let chg2cross = 1
+    endif
+   endif
+
+   if chg2cross
+    if g:drawit_mode == 'S'
+     exe "norm! r".b:di_Scross
+    else
+     exe "norm! r".b:di_cross
+    endif
+   else
+    if g:drawit_mode == 'S'
+     exe "norm! r".b:di_Supright
+    else
+     exe "norm! r".b:di_upright
+    endif
+   endif
+  else
+    if g:drawit_mode == 'S'
+     exe "norm! i".b:di_Supright."\<Esc>"
+    else
+     exe "norm! i".b:di_upright."\<Esc>"
+    endif
+  endif
+  let @@= keepatat
+"  call Dret("s:ReplaceDownLeft")
+endfun
+
+" ---------------------------------------------------------------------
+" s:ReplaceDownRight: \ X  (upleft) {{{2
+fun! s:ReplaceDownRight()
+"  call Dfunc("s:ReplaceDownRight()")
+  let curcol   = virtcol(".")
+  let keepatat = @@
+  if curcol != virtcol("$")
+   norm! vy
+   let curchar= @@
+"   call Decho("case curcol#".curcol." == virtcol($)  drawit_mode<".g:drawit_mode.">  curchar<".curchar.">")
+
+   " determine if curchr needs to be changed to an "X"
+   let chg2cross = 0
+   if curchar == b:di_upright   || curchar == b:di_cross
+    let chg2cross = 1
+   elseif b:di_gfxchr
+	" performing following test only if gfx drawing characters exist
+    if curchar == b:di_Supright || curchar == b:di_Scross
+     let chg2cross = 1
+    endif
+   endif
+
+   if chg2cross
+    if g:drawit_mode == 'S'
+     exe "norm! r".b:di_Scross
+    else
+     exe "norm! r".b:di_cross
+    endif
+   else
+    if g:drawit_mode == 'S'
+     exe "norm! r".b:di_Supleft
+    else
+     exe "norm! r".b:di_upleft
+    endif
+   endif
+  else
+"   call Decho("case curcol#".curcol." != virtcol($)  drawit_mode<".g:drawit_mode.">")
+   if g:drawit_mode == 'S'
+    exe "norm! i".b:di_Supleft."\<Esc>"
+   else
+    exe "norm! i".b:di_upleft."\<Esc>"
+   endif
+  endif
+  let @@= keepatat
+"  call Dret("s:ReplaceDownRight")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawFatRArrow: ----|> {{{2
+fun! s:DrawFatRArrow()
+"  call Dfunc("s:DrawFatRArrow()")
+  if g:drawit_mode == 'N' || !b:di_gfxchr
+   call s:MoveRight()
+   norm! r|
+   call s:MoveRight()
+   norm! r>
+  else
+   call s:MoveRight()
+   norm! r▶
+  endif
+"  call Dret("s:DrawFatRArrow")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawFatLArrow: <|---- {{{2
+fun! s:DrawFatLArrow()
+"  call Dfunc("s:DrawFatLArrow()")
+  if g:drawit_mode == 'N' || !b:di_gfxchr
+   call s:MoveLeft()
+   norm! r|
+   call s:MoveLeft()
+   norm! r<
+  else
+   call s:MoveLeft()
+   norm! r◀
+  endif
+"  call Dret("s:DrawFatLArrow")
+endfun
+
+" ---------------------------------------------------------------------
+"                 .
+" s:DrawFatUArrow: /_\ {{{2
+"                 |
+fun! s:DrawFatUArrow()
+"  call Dfunc("s:DrawFatUArrow()")
+  if g:drawit_mode == 'N' || !b:di_bfxchr
+   call s:MoveUp()
+   norm! r_
+   call s:MoveRight()
+   norm! r\
+   call s:MoveLeft()
+   call s:MoveLeft()
+   norm! r/
+   call s:MoveRight()
+   call s:MoveUp()
+   norm! r.
+  else
+   call s:MoveUp()
+   norm! r▲
+  endif
+"  call Dret("s:DrawFatUArrow")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawFatDArrow: _|_ {{{2
+"                  \ /
+"                   '
+fun! s:DrawFatDArrow()
+"  call Dfunc("s:DrawFatDArrow()")
+  if g:drawit_mode == 'N' || !b:di_gfxchr
+   call s:MoveRight()
+   norm! r_
+   call s:MoveLeft()
+   call s:MoveLeft()
+   norm! r_
+   call s:MoveDown()
+   norm! r\
+   call s:MoveRight()
+   call s:MoveRight()
+   norm! r/
+   call s:MoveDown()
+   call s:MoveLeft()
+   norm! r'
+  else
+   call s:MoveDown()
+   norm! r▼
+  endif
+"  call Dret("s:DrawFatDArrow")
+endfun
+
+" ---------------------------------------------------------------------
+" s:DrawEllipse: Bresenham-like ellipse drawing algorithm {{{2
+"      2   2      can
+"     x   y       be             2 2   2 2   2 2
+"     - + - = 1   rewritten     b x + a y = a b
+"     a   b       as
+"
+"     Take step which has minimum error
+"     (x,y-1)  (x+1,y)  (x+1,y-1)
+"
+"             2 2   2 2   2 2
+"     Ei = | b x + a y - a b |
+"
+"     Algorithm only draws arc from (0,b) to (a,0) and uses
+"     DrawFour() to reflect points to other three quadrants
+fun! s:DrawEllipse(x0,y0,x1,y1)
+"  call Dfunc("s:DrawEllipse(x0=".a:x0." y0=".a:y0." x1=".a:x1." y1=".a:y1.")")
+  let x0   = a:x0
+  let y0   = a:y0
+  let x1   = a:x1
+  let y1   = a:y1
+  let xoff = (x0+x1)/2
+  let yoff = (y0+y1)/2
+  let a    = s:Abs(x1-x0)/2
+  let b    = s:Abs(y1-y0)/2
+  let a2   = a*a
+  let b2   = b*b
+  let twoa2= a2 + a2
+  let twob2= b2 + b2
+
+  let xi= 0
+  let yi= b
+  let ei= 0
+  call s:DrawFour(xi,yi,xoff,yoff,a,b)
+  while xi <= a && yi >= 0
+
+     let dy= a2 - twoa2*yi
+     let ca= ei + twob2*xi + b2
+     let cb= ca + dy
+     let cc= ei + dy
+
+     let aca= s:Abs(ca)
+     let acb= s:Abs(cb)
+     let acc= s:Abs(cc)
+
+     " pick case: (xi+1,yi) (xi,yi-1) (xi+1,yi-1)
+     if aca <= acb && aca <= acc
+        let xi= xi + 1
+        let ei= ca
+     elseif acb <= aca && acb <= acc
+        let ei= cb
+        let xi= xi + 1
+        let yi= yi - 1
+     else
+        let ei= cc
+        let yi= yi - 1
+     endif
+     if xi > a:x1
+        break
+     endif
+     call s:DrawFour(xi,yi,xoff,yoff,a,b)
+  endw
+"  call Dret("s:DrawEllipse")
+endf
+
+" ---------------------------------------------------------------------
+" s:DrawFour: reflect a point to four quadrants {{{2
+fun! s:DrawFour(x,y,xoff,yoff,a,b)
+"  call Dfunc("s:DrawFour(xy[".a:x.",".a:y."] off[".a:xoff.",".a:yoff."] a=".a:a." b=".a:b.")")
+  let x  = a:xoff + a:x
+  let y  = a:yoff + a:y
+  let lx = a:xoff - a:x
+  let by = a:yoff - a:y
+  call s:SetCharAt(b:di_ellipse,  x, y)
+  call s:SetCharAt(b:di_ellipse, lx, y)
+  call s:SetCharAt(b:di_ellipse, lx,by)
+  call s:SetCharAt(b:di_ellipse,  x,by)
+"  call Dret("s:DrawFour")
+endf
+
+" ---------------------------------------------------------------------
+" s:SavePosn: saves position of cursor on screen so NetWrite can restore it {{{2
+fun! s:SavePosn()
+"  call Dfunc("s:SavePosn() saveposn_count=".s:saveposn_count.' ['.line('.').','.virtcol('.').']')
+  let s:saveposn_count= s:saveposn_count + 1
+
+  " Save current line and column
+  let b:drawit_line_{s:saveposn_count} = line(".")
+  let b:drawit_col_{s:saveposn_count}  = virtcol(".") - 1
+
+  " Save top-of-screen line
+  norm! H
+  let b:drawit_hline_{s:saveposn_count}= line(".")
+
+  " restore position
+  exe "norm! ".b:drawit_hline_{s:saveposn_count}."G0z\<CR>"
+  if b:drawit_col_{s:saveposn_count} == 0
+   exe "norm! ".b:drawit_line_{s:saveposn_count}."G0"
+  else
+   exe "norm! ".b:drawit_line_{s:saveposn_count}."G0".b:drawit_col_{s:saveposn_count}."l"
+  endif
+"  call Dret("s:SavePosn : saveposn_count=".s:saveposn_count)
+endfun
+
+" ------------------------------------------------------------------------
+" s:RestorePosn: {{{2
+fun! s:RestorePosn()
+"  call Dfunc("s:RestorePosn() saveposn_count=".s:saveposn_count)
+  if s:saveposn_count <= 0
+"  	call Dret("s:RestorePosn : s:saveposn_count<=0")
+  	return
+  endif
+  " restore top-of-screen line
+  exe "norm! ".b:drawit_hline_{s:saveposn_count}."G0z\<CR>"
+
+  " restore position
+  if b:drawit_col_{s:saveposn_count} == 0
+   exe "norm! ".b:drawit_line_{s:saveposn_count}."G0"
+  else
+   exe "norm! ".b:drawit_line_{s:saveposn_count}."G0".b:drawit_col_{s:saveposn_count}."l"
+  endif
+  if s:saveposn_count > 0
+	unlet b:drawit_hline_{s:saveposn_count}
+	unlet b:drawit_line_{s:saveposn_count}
+	unlet b:drawit_col_{s:saveposn_count}
+   let s:saveposn_count= s:saveposn_count - 1
+  endif
+"  call Dret("s:RestorePosn : saveposn_count=".s:saveposn_count)
+endfun
+
+" ------------------------------------------------------------------------
+" s:Flood: this function begins a flood of a region {{{2
+"        based on b:di... characters as boundaries
+"        and starting at the current cursor location.
+fun! s:Flood()
+"  call Dfunc("s:Flood()")
+
+  let s:bndry  = b:di_vert.b:di_horiz.b:di_plus.b:di_upright.b:di_upleft.b:di_cross.b:di_ellipse
+  if b:di_gfxchr
+   let s:bndry= s:bndry.b:di_Svert.b:di_Dvert.b:di_Shoriz.b:di_Dhoriz.b:di_Sulcorn.b:di_Dulcorn.b:di_Surcorn.b:di_Durcorn.b:di_Sllcorn.b:di_Dllcorn.b:di_Slrcorn.b:di_Dlrcorn.b:di_Splus.b:di_Dplus.b:di_Sdnplus.b:di_Ddnplus.b:di_Supplus.b:di_Dupplus.b:di_Slplus.b:di_Dlplus.b:di_Srplus.b:di_Drplus.b:di_Supright.b:di_Supleft.b:di_Scross
+   let s:bndry= s:bndry.b:di_DhSd.b:di_DhSu.b:di_DuSl.b:di_DuSlr.b:di_DuSr.b:di_ShDd.b:di_ShDu.b:di_SuDl.b:di_SuDlr.b:di_SdDh.b:di_SuDh.b:di_SuDr.b:di_cSdDr.b:di_cDdSr.b:di_cDlSd.b:di_cSlDd.b:di_cDrSu.b:di_cSrDu.b:di_cDlSu.b:di_cSlDu
+  endif
+  let row      = line(".")
+  let col      = virtcol(".")
+  let athold   = @0
+  let s:DIrows = line("$")
+  call s:SavePosn()
+
+  " get fill character from user
+  " Put entire fillchar string into the s:bndry (boundary characters),
+  " although only use the first such character for filling
+  call inputsave()
+  let s:fillchar= input("Enter fill character: ")
+  call inputrestore()
+  let s:bndry= "[".escape(s:bndry.s:fillchar,'\-]^')."]"
+"  call Decho("s:bndry<".s:bndry.">")
+  if s:Strlen(s:fillchar) > 1
+   let s:fillchar= strpart(s:fillchar,0,1)
+  endif
+
+  " flood the region
+  call s:DI_Flood(row,col)
+
+  " restore
+  call s:RestorePosn()
+  let @0= athold
+  unlet s:DIrows s:bndry s:fillchar
+
+"  call Dret("s:Flood")
+endfun
+
+" ------------------------------------------------------------------------
+" s:DI_Flood: fill up to the boundaries all characters to the left and right. {{{2
+"           Then, based on the left/right column extents reached, check
+"           adjacent rows to see if any characters there need filling.
+fun! s:DI_Flood(frow,fcol)
+"  call Dfunc("s:DI_Flood(frow=".a:frow." fcol=".a:fcol.")")
+  if a:frow <= 0 || a:fcol <= 0 || s:SetPosn(a:frow,a:fcol) || s:IsBoundary(a:frow,a:fcol)
+"   call Dret("s:DI_Flood")
+   return
+  endif
+
+  " fill current line
+  let colL= s:DI_FillLeft(a:frow,a:fcol)
+  let colR= s:DI_FillRight(a:frow,a:fcol+1)
+
+  " do a filladjacent on the next line up
+  if a:frow > 1
+   call s:DI_FillAdjacent(a:frow-1,colL,colR)
+  endif
+
+  " do a filladjacent on the next line down
+  if a:frow < s:DIrows
+   call s:DI_FillAdjacent(a:frow+1,colL,colR)
+  endif
+
+"  call Dret("s:DI_Flood")
+endfun
+
+" ------------------------------------------------------------------------
+"  s:DI_FillLeft: Starting at (frow,fcol), non-boundary locations are {{{2
+"               filled with the fillchar.  The leftmost extent reached
+"               is returned.
+fun! s:DI_FillLeft(frow,fcol)
+"  call Dfunc("s:DI_FillLeft(frow=".a:frow." fcol=".a:fcol.")")
+  if s:SetPosn(a:frow,a:fcol)
+"   call Dret("s:DI_FillLeft ".a:fcol)
+   return a:fcol
+  endif
+
+  let Lcol= a:fcol
+  while Lcol >= 1
+   if !s:IsBoundary(a:frow,Lcol)
+    exe  "silent! norm! r".s:fillchar."h"
+   else
+    break
+   endif
+   let Lcol= Lcol - 1
+  endwhile
+
+ let Lcol= (Lcol < 1)? 1 : Lcol + 1
+
+" call Dret("s:DI_FillLeft ".Lcol)
+ return Lcol
+endfun
+
+" ---------------------------------------------------------------------
+"  s:DI_FillRight: Starting at (frow,fcol), non-boundary locations are {{{2
+"                filled with the fillchar.  The rightmost extent reached
+"                is returned.
+fun! s:DI_FillRight(frow,fcol)
+"  call Dfunc("s:DI_FillRight(frow=".a:frow." fcol=".a:fcol.")")
+  if s:SetPosn(a:frow,a:fcol)
+"   call Dret("s:DI_FillRight ".a:fcol)
+   return a:fcol
+  endif
+
+  let Rcol   = a:fcol
+  while Rcol <= virtcol("$")
+   if !s:IsBoundary(a:frow,Rcol)
+    exe "silent! norm! r".s:fillchar."l"
+   else
+    break
+   endif
+   let Rcol= Rcol + 1
+  endwhile
+
+  let DIcols = virtcol("$")
+  let Rcol   = (Rcol > DIcols)? DIcols : Rcol - 1
+
+"  call Dret("s:DI_FillRight ".Rcol)
+  return Rcol
+endfun
+
+" ---------------------------------------------------------------------
+"  s:DI_FillAdjacent: {{{2
+"     DI_Flood does FillLeft and FillRight, so the run from left to right
+"    (fcolL to fcolR) is known to have been filled.  FillAdjacent is called
+"    from (fcolL to fcolR) on the lines one row up and down; if any character
+"    on the run is not a boundary character, then a flood is needed on that
+"    location.
+fun! s:DI_FillAdjacent(frow,fcolL,fcolR)
+"  call Dfunc("s:DI_FillAdjacent(frow=".a:frow." fcolL=".a:fcolL." fcolR=".a:fcolR.")")
+
+  let icol  = a:fcolL
+  while icol <= a:fcolR
+	if !s:IsBoundary(a:frow,icol)
+	 call s:DI_Flood(a:frow,icol)
+	endif
+   let icol= icol + 1
+  endwhile
+
+"  call Dret("s:DI_FillAdjacent")
+endfun
+
+" ---------------------------------------------------------------------
+" s:SetPosn: set cursor to given position on screen {{{2
+"    srow,scol: -s-creen    row and column
+"   Returns  1 : failed sanity check
+"            0 : otherwise
+fun! s:SetPosn(row,col)
+"  call Dfunc("s:SetPosn(row=".a:row." col=".a:col.")")
+  " sanity checks
+  if a:row < 1
+"   call Dret("s:SetPosn 1")
+   return 1
+  endif
+  if a:col < 1
+"   call Dret("s:SetPosn 1")
+   return 1
+  endif
+
+  exe "norm! ".a:row."G".a:col."\<Bar>"
+
+"  call Dret("s:SetPosn 0")
+  return 0
+endfun
+
+" ---------------------------------------------------------------------
+" s:IsBoundary: returns 0 if not on boundary, 1 if on boundary {{{2
+"             The "boundary" also includes the fill character.
+fun! s:IsBoundary(row,col)
+"  call Dfunc("s:IsBoundary(row=".a:row." col=".a:col.")")
+
+  let orow= line(".")
+  let ocol= virtcol(".")
+  exe "norm! ".a:row."G".a:col."\<Bar>"
+  norm! vy
+  let ret= @0 =~ s:bndry
+  if a:row != orow || a:col != ocol
+   exe "norm! ".orow."G".ocol."\<Bar>"
+  endif
+
+"  call Dret("s:IsBoundary ".ret." : @0<".@0.">")
+  return ret
+endfun
+
+" ---------------------------------------------------------------------
+" s:PutBlock: puts a register's contents into the text at the current {{{2
+"           cursor location
+"              replace= 0: Blanks are transparent
+"                     = 1: Blanks copy over
+"                     = 2: Erase all drawing characters
+"
+fun! s:PutBlock(block,replace)
+"  call Dfunc("s:PutBlock(block<".a:block."> replace=".a:replace.") g:drawit_xstrlen=".g:drawit_xstrlen)
+  call s:SavePosn()
+  exe "let block  = @".a:block
+  let blocklen    = strlen(block)
+  let drawit_line = line('.')
+  let drawchars   = '['.escape(b:di_vert.b:di_horiz.b:di_plus.b:di_upright.b:di_upleft.b:di_cross,'\-').']'
+"  call Decho("blocklen=".blocklen." block<".string(block).">")
+
+  " insure that putting a block will do so in a region containing spaces out to textwidth
+  exe "let blockrows= s:Strlen(substitute(@".a:block.",'[^[:cntrl:]]','','g'))"
+  exe 'let blockcols= s:Strlen(substitute(@'.a:block.",'^\\(.\\{-}\\)\\n\\_.*$','\\1',''))"
+  let curline= line('.')
+  let curcol = virtcol('.')
+"  call Decho("blockrows=".blockrows." blockcols=".blockcols." curline=".curline." curcol=".curcol)
+  call s:AutoCanvas(curline-1,curline + blockrows+1,curcol + blockcols)
+
+  let iblock= 0
+  while iblock < blocklen
+   " the following logic should permit 1, 2, or 4 byte glyphs (I've only tested it with 1 and 2)
+  	let chr= strpart(block,iblock,4)
+	if char2nr(chr) <= 255
+  	 let chr= strpart(block,iblock,1)
+	elseif char2nr(chr) <= 65536
+  	 let chr= strpart(block,iblock,2)
+	 let iblock= iblock + 1
+	else
+	 let iblock= iblock + 3
+	endif
+"	call Decho("iblock=".iblock." chr#".char2nr(chr)."<".string(chr).">")
+
+	if char2nr(chr) == 10
+	 " handle newline
+	 let drawit_line= drawit_line + 1
+     if b:drawit_col_{s:saveposn_count} == 0
+      exe "norm! ".drawit_line."G0"
+     else
+      exe "norm! ".drawit_line."G0".b:drawit_col_{s:saveposn_count}."l"
+     endif
+
+	elseif a:replace == 2
+	 " replace all drawing characters with blanks
+	 if match(chr,drawchars) != -1
+	  norm! r l
+	 else
+	  norm! l
+	 endif
+
+	elseif chr == ' ' && a:replace == 0
+	 " allow blanks to be transparent
+	 norm! l
+
+	else
+	 " usual replace character
+	 exe "norm! r".chr."l"
+	endif
+  	let iblock = iblock + 1
+  endwhile
+  call s:RestorePosn()
+
+"  call Dret("s:PutBlock")
+endfun
+
+" ---------------------------------------------------------------------
+" s:AutoCanvas: automatic "Canvas" routine {{{2
+fun! s:AutoCanvas(linestart,linestop,cols)
+"  call Dfunc("s:AutoCanvas(linestart=".a:linestart." linestop=".a:linestop." cols=".a:cols.")  line($)=".line("$"))
+
+  " insure there's enough blank lines at end-of-file
+  if line("$") < a:linestop
+"   call Decho("append ".(a:linestop - line("$"))." empty lines")
+   call s:SavePosn()
+   exe "norm! G".(a:linestop - line("$"))."o\<esc>"
+   call s:RestorePosn()
+  endif
+
+  " insure that any tabs contained within the selected region are converted to blanks
+  let etkeep= &l:et
+  set et
+"  call Decho("exe ".a:linestart.",".a:linestop."retab")
+  exe a:linestart.",".a:linestop."retab"
+  let &l:et= etkeep
+
+  " insure that there's whitespace to textwidth/screenwidth/a:cols
+  if a:cols <= 0
+   let tw= &tw
+   if tw <= 0
+    let tw= &columns
+   endif
+  else
+   let tw= a:cols
+  endif
+"  Decho("tw=".tw)
+  if search('^$\|.\%<'.(tw+1).'v$',"cn",(a:linestop+1)) > 0
+"   call Decho("append trailing whitespace")
+   call s:Spacer(a:linestart,a:linestop,tw)
+  endif
+
+"  call Dret("s:AutoCanvas : tw=".tw)
+endfun
+
+" ---------------------------------------------------------------------
+" s:Strlen: this function returns the length of a string, even if its {{{2
+"           using two-byte etc characters.
+"           Currently, its only used if g:Align_xstrlen is set to a
+"           nonzero value.  Solution from Nicolai Weibull, vim docs
+"           (:help strlen()), Tony Mechelynck, and my own invention.
+fun! s:Strlen(x)
+"  call Dfunc("s:Strlen(x<".a:x.">")
+  
+  if v:version >= 703 && exists("*strdisplaywidth")
+   let ret= strdisplaywidth(a:x)
+ 
+  elseif g:drawit_xstrlen == 1
+   " number of codepoints (Latin a + combining circumflex is two codepoints)
+   " (comment from TM, solution from NW)
+   let ret= strlen(substitute(a:x,'.','c','g'))
+
+  elseif g:drawit_xstrlen == 2
+   " number of spacing codepoints (Latin a + combining circumflex is one spacing 
+   " codepoint; a hard tab is one; wide and narrow CJK are one each; etc.)
+   " (comment from TM, solution from TM)
+   let ret= strlen(substitute(a:x, '.\Z', 'x', 'g')) 
+
+  elseif g:drawit_xstrlen == 3
+   " virtual length (counting, for instance, tabs as anything between 1 and 
+   " 'tabstop', wide CJK as 2 rather than 1, Arabic alif as zero when immediately 
+   " preceded by lam, one otherwise, etc.)
+   " (comment from TM, solution from me)
+   let modkeep= &l:mod
+   exe "norm! o\<esc>"
+   call setline(line("."),a:x)
+   let ret= virtcol("$") - 1
+   d
+   keepj norm! k
+   let &l:mod= modkeep
+
+  else
+   " at least give a decent default
+   let ret= strlen(a:x)
+  endif
+
+"  call Dret("s:Strlen ".ret)
+  return ret
+endfun
+
+" =====================================================================
+"  DrawIt Functions: (by Sylvain Viart) {{{1
+" =====================================================================
+
+" ---------------------------------------------------------------------
+" s:Canvas: {{{2
+fun! s:Canvas()
+"  call Dfunc("s:Canvas()")
+
+  let lines  = input("how many lines under the cursor? ")
+  let curline= line('.')
+  if curline < line('$')
+   exe "norm! ".lines."o\<esc>"
+  endif
+  call s:Spacer(curline+1,curline+lines,0)
+  let b:drawit_canvas_used= 1
+
+"  call Dret("s:Canvas")
+endf
+
+" ---------------------------------------------------------------------
+" s:Spacer: fill end of line with space {{{2
+"         if a:cols >0: to the virtual column specified by a:cols
+"                  <=0: to textwidth (if nonzero), otherwise
+"                       to display width (&columns)
+fun! s:Spacer(debut, fin, cols) range
+"  call Dfunc("s:Spacer(debut=".a:debut." fin=".a:fin." cols=".a:cols.") textwidth=".&textwidth)
+  call s:SavePosn()
+
+  if a:cols <= 0
+   let width = &textwidth
+   if width <= 0
+    let width= &columns
+   endif
+  else
+   let width= a:cols
+  endif
+
+  let l= a:debut
+  while l <= a:fin
+   call setline(l,printf('%-'.width.'s',getline(l)))
+   let l = l + 1
+  endwhile
+
+  call s:RestorePosn()
+
+"  call Dret("s:Spacer")
+endf
+
+" ---------------------------------------------------------------------
+" s:CallBox: call the specified function using the current visual selection box {{{2
+fun! s:CallBox(func_name)
+"  call Dfunc("s:CallBox(func_name<".a:func_name.">)")
+
+  if exists("b:xmouse_start")
+   let xdep = b:xmouse_start
+  else
+   let xdep= 0
+  endif
+  if exists("b:ymouse_start")
+   let ydep = b:ymouse_start
+  else
+   let ydep= 0
+  endif
+  let col0   = virtcol("'<")
+  let row0   = line("'<")
+  let col1   = virtcol("'>")
+  let row1   = line("'>")
+"  call Decho("TL corner[".row0.",".col0."] original")
+"  call Decho("BR corner[".row1.",".col1."] original")
+"  call Decho("xydep     [".ydep.",".xdep."]")
+
+  if col1 == xdep && row1 == ydep
+     let col1 = col0
+     let row1 = row0
+     let col0 = xdep
+     let row0 = ydep
+  endif
+"  call Decho("TL corner[".row0.",".col0."]")
+"  call Decho("BR corner[".row1.",".col1."]")
+
+  " insure that the selected region has blanks to that specified by col1
+  call s:AutoCanvas((row0 < row1)? row0 : row1,(row1 > row0)? row1 : row0,(col1 > col0)? col1 : col0)
+
+"  call Decho("exe call s:".a:func_name."(".col0.','.row0.','.col1.','.row1.")")
+  exe "call s:".a:func_name."(".col0.','.row0.','.col1.','.row1.")"
+  let b:xmouse_start= 0
+  let b:ymouse_start= 0
+
+"  call Dret("s:CallBox")
+endf
+
+" ---------------------------------------------------------------------
+" s:DrawBox: {{{2
+fun! s:DrawBox(x0, y0, x1, y1)
+"  call Dfunc("s:DrawBox(xy0[".a:x0.",".a:y0." xy1[".a:x1.",".a:y1."]) g:drawit_mode=".g:drawit_mode)
+  " loop each line
+  let x0= (a:x1 > a:x0)? a:x0 : a:x1
+  let x1= (a:x1 > a:x0)? a:x1 : a:x0
+  let y0= (a:y1 > a:y0)? a:y0 : a:y1
+  let y1= (a:y1 > a:y0)? a:y1 : a:y0
+"  call Decho('x0='.x0.' y0='.y0)
+"  call Decho('x1='.x1.' y1='.y1)
+  let l = y0
+  while l <= y1
+   let c = x0
+   while c <= x1
+	let remp= '.'
+    if l == y0 || l == y1
+	 if     g:drawit_mode == 's' || g:drawit_mode == 'S'
+	  let remp = b:di_Shoriz
+	 elseif g:drawit_mode == 'd' || g:drawit_mode == 'D'
+	  let remp = b:di_Dhoriz
+	 else
+	  let remp = b:di_horiz
+	 endif
+	 if g:drawit_mode =~ '[sSdD]'
+	  if     c == x0 && l == y0
+	   let remp= (g:drawit_mode == 's' || g:drawit_mode == 'S')? b:di_Sulcorn : b:di_Dulcorn
+"	   call Decho('x0,y0: ulcorn<'.remp.'>')
+	  elseif c == x1 && l == y0
+	   let remp= (g:drawit_mode == 's' || g:drawit_mode == 'S')? b:di_Surcorn : b:di_Durcorn
+"	   call Decho('x0,y1: ulcorn<'.remp.'>')
+	  elseif c == x0 && l == y1
+	   let remp= (g:drawit_mode == 's' || g:drawit_mode == 'S')? b:di_Sllcorn : b:di_Dllcorn
+"	   call Decho('x1,y0: ulcorn<'.remp.'>')
+	  elseif c == x1 && l == y1
+	   let remp= (g:drawit_mode == 's' || g:drawit_mode == 'S')? b:di_Slrcorn : b:di_Dlrcorn
+"	   call Decho('x1,y1: ulcorn<'.remp.'>')
+	  endif
+	 else
+      if c == x0 || c == x1
+	    let remp = b:di_plus
+      endif
+	 endif
+    else
+	 if     g:drawit_mode == 's' || g:drawit_mode == 'S'
+	  let remp = b:di_Svert
+	 elseif g:drawit_mode == 'd' || g:drawit_mode == 'D'
+	  let remp = b:di_Dvert
+	 else
+	  let remp = b:di_vert
+	 endif
+     if c != x0 && c != x1
+       let remp = '.'
+     endif
+    endif
+
+    if remp != '.'
+     call s:SetCharAt(remp, c, l)
+    endif
+    let c  = c + 1
+   endw
+   let l = l + 1
+  endw
+
+"  call Dret("s:DrawBox")
+endf
+
+" ---------------------------------------------------------------------
+" s:SetCharAt: set the character at the specified position (something must pre-exist at the pos'n) {{{2
+fun! s:SetCharAt(chr, x, y)
+"  call Dfunc("s:SetCharAt(chr<".a:chr."> xy[".a:x.",".a:y."])")
+
+  exe a:y
+  if a:x <= 1
+   exe "norm! 0r".a:chr
+  else
+   exe "norm! 0".(a:x-1)."lr".a:chr
+  endif
+
+"  call Dret("s:SetCharAt")
+endf
+
+" ---------------------------------------------------------------------
+" s:DrawLine: Bresenham line-drawing algorithm {{{2
+" taken from :
+" http://www.graphics.lcs.mit.edu/~mcmillan/comp136/Lecture6/Lines.html
+fun! s:DrawLine(x0, y0, x1, y1, horiz)
+"  call Dfunc("s:DrawLine(xy0[".a:x0.",".a:y0."] xy1[".a:x1.",".a:y1."] horiz=".a:horiz.")")
+
+  if ( a:x0 < a:x1 && a:y0 > a:y1 ) || ( a:x0 > a:x1 && a:y0 > a:y1 )
+    " swap direction
+    let x0   = a:x1
+    let y0   = a:y1
+    let x1   = a:x0
+    let y1   = a:y0
+"	call Decho("swap points: p0(".x0.",".y0.")  p1(".x1.",".y1.")")
+  else
+    let x0 = a:x0
+    let y0 = a:y0
+    let x1 = a:x1
+    let y1 = a:y1
+"	call Decho("points: p0(".x0.",".y0.")  p1(".x1.",".y1.")")
+  endif
+  let dy = y1 - y0
+  let dx = x1 - x0
+"  call Decho("[dx=x1-x0]=".dx." [dy=y1-y0]=".dy)
+
+  if dy < 0
+     let dy    = -dy
+     let stepy = -1
+  else
+     let stepy = 1
+  endif
+
+  if dx < 0
+     let dx    = -dx
+     let stepx = -1
+  else
+     let stepx = 1
+  endif
+
+  let dy = 2*dy
+  let dx = 2*dx
+  if a:horiz == '_'
+   let horiz= a:horiz
+  else
+   let horiz = (g:drawit_mode == 'N')? b:di_horiz : ((g:drawit_mode == 'S')? b:di_Shoriz : b:di_Dhoriz)
+  endif
+  if a:horiz == '|'
+   let vertline= a:vert
+  else
+   let vertline = (g:drawit_mode == 'N')? b:di_vert : ((g:drawit_mode == 'S')? b:di_Svert : b:di_Dvert)
+  endif
+
+  if dx > dy
+"     call Decho("case dx>dy : Δ=".dx.",".dy." step=".stepx.",".stepy)
+     let char = horiz
+     call s:SetCharAt(char, x0, y0)
+     let fraction = dy - (dx / 2)  " same as 2*Δy - Δx
+     while x0 != x1
+	   let char = horiz
+        if fraction >= 0
+           if stepx > 0
+"			call Decho("..case [fraction=".fraction."]≥0 and [stepx=".stepx."]>0: go upleft")
+			let char = (g:drawit_mode == 'N')? b:di_upleft : b:di_Supleft
+           else
+"			call Decho("..case [fraction=".fraction."]≥0 and [stepx=".stepx."]≤0: go upright")
+			let char = (g:drawit_mode == 'N')? b:di_upright : b:di_Supright
+           endif
+           let y0       = y0 + stepy
+           let fraction = fraction - dx    " same as fraction -= 2*Δx
+"		   call Decho("....[y0+=stepy]=".y0." [fraction-=dx]=".fraction)
+        endif
+        let x0       = x0 + stepx
+        let fraction = fraction + dy	" same as fraction = fraction - 2*Δy
+"		call Decho("..[x0+=stepx]=".x0." [fraction-=dy]=".fraction)
+        call s:SetCharAt(char, x0, y0)
+     endw
+  else
+"     call Decho("case dx≤dy : Δ=".dx.",".dy." step=".stepx.",".stepy)
+	 let char = vertline
+     call s:SetCharAt(char, x0, y0)
+     let fraction = dx - (dy / 2)
+     while y0 != y1
+		let char = (g:drawit_mode == 'N')? b:di_vert : ((g:drawit_mode == 'S')? b:di_Svert : b:di_Dvert)
+        if fraction >= 0
+           if stepx > 0
+"			call Decho("..case [fraction=".fraction."]≥0 and [stepx=".stepx."]>0: go upleft")
+			let char = (g:drawit_mode == 'N')? b:di_upleft : b:di_Supleft
+           else
+"			call Decho("..case [fraction=".fraction."]≥0 and [stepx=".stepy."]≤0: go upright")
+			let char = (g:drawit_mode == 'N')? b:di_upright : b:di_Supright
+           endif
+           let x0       = x0 + stepx
+           let fraction = fraction - dy
+"		   call Decho("....[x0+=stepx]=".x0." [fraction-=dy]=".fraction)
+        endif
+        let y0       = y0 + stepy
+        let fraction = fraction + dx
+"		call Decho("..[y0+=stepy]=".y0." [fraction-=dy]=".fraction)
+        call s:SetCharAt(char, x0, y0)
+     endw
+  endif
+
+"  call Dret("s:DrawLine")
+endf
+
+" ---------------------------------------------------------------------
+" s:Arrow: {{{2
+fun! s:Arrow(x0, y0, x1, y1)
+"  call Dfunc("s:Arrow(xy0[".a:x0.",".a:y0."] xy1[".a:x1.",".a:y1."])")
+
+  let horiz = (g:drawit_mode == 'N')? b:di_horiz : ((g:drawit_mode == 'S')? b:di_Shoriz : b:di_Dhoriz)
+  call s:DrawLine(a:x0, a:y0, a:x1, a:y1,horiz)
+  let dy = a:y1 - a:y0
+  let dx = a:x1 - a:x0
+  if s:Abs(dx) > <SID>Abs(dy)
+     " move x
+     if dx > 0
+        call s:SetCharAt('>', a:x1, a:y1)
+     else
+        call s:SetCharAt('<', a:x1, a:y1)
+     endif
+  else
+     " move y
+     if dy > 0
+        call s:SetCharAt('v', a:x1, a:y1)
+     else
+        call s:SetCharAt('^', a:x1, a:y1)
+     endif
+  endif
+
+"  call Dret("s:Arrow")
+endf
+
+" ---------------------------------------------------------------------
+" s:Abs: return absolute value {{{2
+fun! s:Abs(val)
+  if a:val < 0
+   return - a:val
+  else
+   return a:val
+  endif
+endf
+
+" ---------------------------------------------------------------------
+" s:DrawPlainLine: {{{2
+fun! s:DrawPlainLine(x0,y0,x1,y1)
+"  call Dfunc("s:DrawPlainLine(xy0[".a:x0.",".a:y0."] xy1[".a:x1.",".a:y1."])")
+
+"   call Decho("exe call s:DrawLine(".a:x0.','.a:y0.','.a:x1.','.a:y1.',"_")')
+   exe "call s:DrawLine(".a:x0.','.a:y0.','.a:x1.','.a:y1.',"_")'
+
+"  call Dret("s:DrawPlainLine")
+endf
+
+" =====================================================================
+"  Mouse Functions: {{{1
+" =====================================================================
+
+" ---------------------------------------------------------------------
+" s:LeftStart: Read visual drag mapping {{{2
+" The visual start point is saved in b:xmouse_start and b:ymouse_start
+fun! s:LeftStart()
+"  call Dfunc("s:LeftStart()")
+  let b:xmouse_start = virtcol('.')
+  let b:ymouse_start = line('.')
+  vnoremap <silent> <buffer> <script> <leftrelease> <leftrelease>:<c-u>call <SID>LeftRelease()<cr>gv
+"  call Dret("s:LeftStart : [".b:ymouse_start.",".b:xmouse_start."]")
+endf!
+
+" ---------------------------------------------------------------------
+" s:LeftRelease: {{{2
+fun! s:LeftRelease()
+"  call Dfunc("s:LeftRelease()")
+  vunmap <buffer> <leftrelease>
+"  call Dret("s:LeftRelease : [".line('.').','.virtcol('.').']')
+endf
+
+" ---------------------------------------------------------------------
+" s:SLeftStart: begin drawing with a brush {{{2
+fun! s:SLeftStart()
+  if !exists("b:drawit_brush")
+   let b:drawit_brush= "a"
+  endif
+"  call Dfunc("s:SLeftStart() brush=".b:drawit_brush.' ['.line('.').','.virtcol('.').']')
+  noremap <silent> <buffer> <script> <s-leftdrag>    <leftmouse>:<c-u>call <SID>SLeftDrag()<cr>
+  noremap <silent> <buffer> <script> <s-leftrelease> <leftmouse>:<c-u>call <SID>SLeftRelease()<cr>
+"  call Dret("s:SLeftStart")
+endfun
+
+" ---------------------------------------------------------------------
+" s:SLeftDrag: {{{2
+fun! s:SLeftDrag()
+"  call Dfunc("s:SLeftDrag() brush=".b:drawit_brush.' ['.line('.').','.virtcol('.').']')
+  call s:SavePosn()
+  call s:PutBlock(b:drawit_brush,0)
+  call s:RestorePosn()
+"  call Dret("s:SLeftDrag")
+endfun
+
+" ---------------------------------------------------------------------
+" s:SLeftRelease: {{{2
+fun! s:SLeftRelease()
+"  call Dfunc("s:SLeftRelease() brush=".b:drawit_brush.' ['.line('.').','.virtcol('.').']')
+  call s:SLeftDrag()
+  nunmap <buffer> <s-leftdrag>
+  nunmap <buffer> <s-leftrelease>
+"  call Dret("s:SLeftRelease")
+endfun
+
+" ---------------------------------------------------------------------
+" s:CLeftStart: begin moving a block of text {{{2
+fun! s:CLeftStart()
+  if !exists("b:drawit_brush")
+   let b:drawit_brush= "a"
+  endif
+"  call Dfunc("s:CLeftStart() brush=".b:drawit_brush)
+  if !line("'<") || !line("'>")
+   redraw!
+   echohl Error
+   echo "must visual-block select a region first"
+"   call Dret("s:CLeftStart : must visual-block select a region first")
+   return
+  endif
+  '<,'>call DrawIt#SetBrush(b:drawit_brush)
+  norm! gvr 
+  let s:cleft_width= virtcol("'>") - virtcol("'<")
+  if s:cleft_width < 0
+   let s:cleft_width= -s:cleft_width
+  endif
+  let s:cleft_height= line("'>") - line("'<")
+  if s:cleft_height < 0
+   let s:cleft_height= -s:cleft_height
+  endif
+  if exists("s:cleft_oldblock")
+   unlet s:cleft_oldblock
+  endif
+"  call Decho("blocksize: ".s:cleft_height."x".s:cleft_width)
+  noremap <silent> <buffer> <script> <c-leftdrag>    :<c-u>call <SID>CLeftDrag()<cr>
+  noremap <silent> <buffer> <script> <c-leftrelease> <leftmouse>:<c-u>call <SID>CLeftRelease()<cr>
+"  call Dret("s:CLeftStart")
+endfun
+
+" ---------------------------------------------------------------------
+" s:CLeftDrag: {{{2
+fun! s:CLeftDrag()
+"  call Dfunc("s:CLeftDrag() cleft_width=".s:cleft_width." cleft_height=".s:cleft_height)
+  exe 'let keepbrush= @'.b:drawit_brush
+"  call Decho("keepbrush<".keepbrush.">")
+
+  " restore prior contents of block zone
+  if exists("s:cleft_oldblock")
+"   call Decho("draw prior contents: [".line(".").",".virtcol(".")."] line($)=".line("$"))
+"   call Decho("draw prior contents<".s:cleft_oldblock.">")
+   exe 'let @'.b:drawit_brush.'=s:cleft_oldblock'
+   call s:PutBlock(b:drawit_brush,1)
+  endif
+
+  " move cursor to <leftmouse> position
+  exe "norm! \<leftmouse>"
+
+  " save new block zone contents
+"  call Decho("save contents: [".line(".").",".virtcol(".")."] - [".(line(".")+s:cleft_height).",".(virtcol(".")+s:cleft_width)."]")
+  let curline= line(".")
+  call s:AutoCanvas(curline,curline + s:cleft_height,virtcol(".")+s:cleft_width)
+  if s:cleft_width > 0 && s:cleft_height > 0
+   exe "silent! norm! \<c-v>".s:cleft_width."l".s:cleft_height.'j"'.b:drawit_brush.'y'
+  elseif s:cleft_width > 0
+   exe "silent! norm! \<c-v>".s:cleft_width.'l"'.b:drawit_brush.'y'
+  else
+   exe "silent! norm! \<c-v>".s:cleft_height.'j"'.b:drawit_brush.'y'
+  endif
+  exe "let s:cleft_oldblock= @".b:drawit_brush
+"  call Decho("s:cleft_oldblock=@".b:drawit_brush)
+"  call Decho("cleft_height=".s:cleft_height." cleft_width=".s:cleft_width)
+"  call Decho("save contents<".s:cleft_oldblock.">")
+
+  " draw the brush
+"  call Decho("draw brush")
+"  call Decho("draw brush ".b:drawit_brush.": [".line(".").",".virtcol(".")."] line($)=".line("$"))
+  exe 'let @'.b:drawit_brush.'=keepbrush'
+  call s:PutBlock(b:drawit_brush,1)
+
+"  call Dret("s:CLeftDrag")
+endfun
+
+" ---------------------------------------------------------------------
+" s:CLeftRelease: {{{2
+fun! s:CLeftRelease()
+"  call Dfunc("s:CLeftRelease()")
+  call s:CLeftDrag()
+  nunmap <buffer> <c-leftdrag>
+  nunmap <buffer> <c-leftrelease>
+  unlet s:cleft_oldblock s:cleft_height s:cleft_width
+"  call Dret("s:CLeftRelease")
+endfun
+
+" ---------------------------------------------------------------------
+" DrawIt#SetBrush: {{{2
+fun! DrawIt#SetBrush(brush) range
+"  call Dfunc("DrawIt#SetBrush(brush<".a:brush.">)")
+  let b:drawit_brush= a:brush
+"  call Decho("visualmode<".visualmode()."> range[".a:firstline.",".a:lastline."] visrange[".line("'<").",".line("'>")."]")
+  if visualmode() == "\<c-v>" && ((a:firstline == line("'>") && a:lastline == line("'<")) || (a:firstline == line("'<") && a:lastline == line("'>")))
+   " last visual mode was visual block mode, and
+   " either [firstline,lastline] == ['<,'>] or ['>,'<]
+   " Assuming that SetBrush called from a visual-block selection!
+   " Yank visual block into selected register (brush)
+"   call Decho("yanking visual block into register ".b:drawit_brush)
+   exe 'norm! gv"'.b:drawit_brush.'y'
+  endif
+"  call Dret("DrawIt#SetBrush : b:drawit_brush=".b:drawit_brush)
+endfun
+
+" ------------------------------------------------------------------------
+" Modelines: {{{1
+" vim: fdm=marker
+let &cpo= s:keepcpo
+unlet s:keepcpo