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+/***********************************
+This is a our graphics core library, for all our displays.
+We'll be adapting all the
+existing libaries to use this core to make updating, support
+and upgrading easier!
+
+Adafruit invests time and resources providing this open source code,
+please support Adafruit and open-source hardware by purchasing
+products from Adafruit!
+
+Written by Limor Fried/Ladyada for Adafruit Industries.
+BSD license, check license.txt for more information
+All text above must be included in any redistribution
+****************************************/
+
+/*
+ * Modified by Neal Horman 7/14/2012 for use in mbed
+ */
+
+#include "mbed.h"
+
+#include "Adafruit_GFX.h"
+#include "glcdfont.h"
+
+#if defined(GFX_WANT_ABSTRACTS)
+// draw a circle outline
+void Adafruit_GFX::drawCircle(int16_t x0, int16_t y0, int16_t r, uint16_t color)
+{
+ int16_t f = 1 - r;
+ int16_t ddF_x = 1;
+ int16_t ddF_y = -2 * r;
+ int16_t x = 0;
+ int16_t y = r;
+
+ drawPixel(x0, y0+r, color);
+ drawPixel(x0, y0-r, color);
+ drawPixel(x0+r, y0, color);
+ drawPixel(x0-r, y0, color);
+
+ while (x<y)
+ {
+ if (f >= 0)
+ {
+ y--;
+ ddF_y += 2;
+ f += ddF_y;
+ }
+ x++;
+ ddF_x += 2;
+ f += ddF_x;
+
+ drawPixel(x0 + x, y0 + y, color);
+ drawPixel(x0 - x, y0 + y, color);
+ drawPixel(x0 + x, y0 - y, color);
+ drawPixel(x0 - x, y0 - y, color);
+ drawPixel(x0 + y, y0 + x, color);
+ drawPixel(x0 - y, y0 + x, color);
+ drawPixel(x0 + y, y0 - x, color);
+ drawPixel(x0 - y, y0 - x, color);
+ }
+}
+
+void Adafruit_GFX::drawCircleHelper( int16_t x0, int16_t y0, int16_t r, uint8_t cornername, uint16_t color)
+{
+ int16_t f = 1 - r;
+ int16_t ddF_x = 1;
+ int16_t ddF_y = -2 * r;
+ int16_t x = 0;
+ int16_t y = r;
+
+ while (x<y)
+ {
+ if (f >= 0)
+ {
+ y--;
+ ddF_y += 2;
+ f += ddF_y;
+ }
+ x++;
+ ddF_x += 2;
+ f += ddF_x;
+
+ if (cornername & 0x4)
+ {
+ drawPixel(x0 + x, y0 + y, color);
+ drawPixel(x0 + y, y0 + x, color);
+ }
+
+ if (cornername & 0x2)
+ {
+ drawPixel(x0 + x, y0 - y, color);
+ drawPixel(x0 + y, y0 - x, color);
+ }
+
+ if (cornername & 0x8)
+ {
+ drawPixel(x0 - y, y0 + x, color);
+ drawPixel(x0 - x, y0 + y, color);
+ }
+
+ if (cornername & 0x1)
+ {
+ drawPixel(x0 - y, y0 - x, color);
+ drawPixel(x0 - x, y0 - y, color);
+ }
+ }
+}
+
+void Adafruit_GFX::fillCircle(int16_t x0, int16_t y0, int16_t r, uint16_t color)
+{
+ drawFastVLine(x0, y0-r, 2*r+1, color);
+ fillCircleHelper(x0, y0, r, 3, 0, color);
+}
+
+// used to do circles and roundrects!
+void Adafruit_GFX::fillCircleHelper(int16_t x0, int16_t y0, int16_t r, uint8_t cornername, int16_t delta, uint16_t color)
+{
+ int16_t f = 1 - r;
+ int16_t ddF_x = 1;
+ int16_t ddF_y = -2 * r;
+ int16_t x = 0;
+ int16_t y = r;
+
+ while (x<y)
+ {
+ if (f >= 0)
+ {
+ y--;
+ ddF_y += 2;
+ f += ddF_y;
+ }
+ x++;
+ ddF_x += 2;
+ f += ddF_x;
+
+ if (cornername & 0x1)
+ {
+ drawFastVLine(x0+x, y0-y, 2*y+1+delta, color);
+ drawFastVLine(x0+y, y0-x, 2*x+1+delta, color);
+ }
+
+ if (cornername & 0x2)
+ {
+ drawFastVLine(x0-x, y0-y, 2*y+1+delta, color);
+ drawFastVLine(x0-y, y0-x, 2*x+1+delta, color);
+ }
+ }
+}
+#endif
+
+#if defined(GFX_WANT_ABSTRACTS) || defined(GFX_SIZEABLE_TEXT)
+// bresenham's algorithm - thx wikpedia
+void Adafruit_GFX::drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color)
+{
+ int16_t steep = abs(y1 - y0) > abs(x1 - x0);
+
+ if (steep)
+ {
+ swap(x0, y0);
+ swap(x1, y1);
+ }
+
+ if (x0 > x1)
+ {
+ swap(x0, x1);
+ swap(y0, y1);
+ }
+
+ int16_t dx, dy;
+ dx = x1 - x0;
+ dy = abs(y1 - y0);
+
+ int16_t err = dx / 2;
+ int16_t ystep;
+
+ if (y0 < y1)
+ ystep = 1;
+ else
+ ystep = -1;
+
+ for (; x0<=x1; x0++)
+ {
+ if (steep)
+ drawPixel(y0, x0, color);
+ else
+ drawPixel(x0, y0, color);
+
+ err -= dy;
+ if (err < 0)
+ {
+ y0 += ystep;
+ err += dx;
+ }
+ }
+}
+
+void Adafruit_GFX::drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color)
+{
+ // stupidest version - update in subclasses if desired!
+ drawLine(x, y, x, y+h-1, color);
+}
+
+void Adafruit_GFX::fillRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color)
+{
+ // stupidest version - update in subclasses if desired!
+ for (int16_t i=x; i<x+w; i++)
+ drawFastVLine(i, y, h, color);
+}
+#endif
+
+#if defined(GFX_WANT_ABSTRACTS)
+// draw a rectangle
+void Adafruit_GFX::drawRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color)
+{
+ drawFastHLine(x, y, w, color);
+ drawFastHLine(x, y+h-1, w, color);
+ drawFastVLine(x, y, h, color);
+ drawFastVLine(x+w-1, y, h, color);
+}
+
+void Adafruit_GFX::drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color)
+{
+ // stupidest version - update in subclasses if desired!
+ drawLine(x, y, x+w-1, y, color);
+}
+
+void Adafruit_GFX::fillScreen(uint16_t color)
+{
+ fillRect(0, 0, _width, _height, color);
+}
+
+// draw a rounded rectangle!
+void Adafruit_GFX::drawRoundRect(int16_t x, int16_t y, int16_t w, int16_t h, int16_t r, uint16_t color)
+{
+ // smarter version
+ drawFastHLine(x+r , y , w-2*r, color); // Top
+ drawFastHLine(x+r , y+h-1, w-2*r, color); // Bottom
+ drawFastVLine( x , y+r , h-2*r, color); // Left
+ drawFastVLine( x+w-1, y+r , h-2*r, color); // Right
+ // draw four corners
+ drawCircleHelper(x+r , y+r , r, 1, color);
+ drawCircleHelper(x+w-r-1, y+r , r, 2, color);
+ drawCircleHelper(x+w-r-1, y+h-r-1, r, 4, color);
+ drawCircleHelper(x+r , y+h-r-1, r, 8, color);
+}
+
+// fill a rounded rectangle!
+void Adafruit_GFX::fillRoundRect(int16_t x, int16_t y, int16_t w, int16_t h, int16_t r, uint16_t color)
+{
+ // smarter version
+ fillRect(x+r, y, w-2*r, h, color);
+
+ // draw four corners
+ fillCircleHelper(x+w-r-1, y+r, r, 1, h-2*r-1, color);
+ fillCircleHelper(x+r , y+r, r, 2, h-2*r-1, color);
+}
+
+// draw a triangle!
+void Adafruit_GFX::drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint16_t color)
+{
+ drawLine(x0, y0, x1, y1, color);
+ drawLine(x1, y1, x2, y2, color);
+ drawLine(x2, y2, x0, y0, color);
+}
+
+// fill a triangle!
+void Adafruit_GFX::fillTriangle ( int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint16_t color)
+{
+ int16_t a, b, y, last;
+
+ // Sort coordinates by Y order (y2 >= y1 >= y0)
+ if (y0 > y1)
+ swap(y0, y1); swap(x0, x1);
+
+ if (y1 > y2)
+ swap(y2, y1); swap(x2, x1);
+
+ if (y0 > y1)
+ swap(y0, y1); swap(x0, x1);
+
+
+ if(y0 == y2)
+ { // Handle awkward all-on-same-line case as its own thing
+ a = b = x0;
+ if(x1 < a)
+ a = x1;
+ else if(x1 > b)
+ b = x1;
+
+ if(x2 < a)
+ a = x2;
+ else if(x2 > b) b = x2;
+ drawFastHLine(a, y0, b-a+1, color);
+ return;
+ }
+
+ int16_t
+ dx01 = x1 - x0,
+ dy01 = y1 - y0,
+ dx02 = x2 - x0,
+ dy02 = y2 - y0,
+ dx12 = x2 - x1,
+ dy12 = y2 - y1,
+ sa = 0,
+ sb = 0;
+
+ // For upper part of triangle, find scanline crossings for segments
+ // 0-1 and 0-2. If y1=y2 (flat-bottomed triangle), the scanline y1
+ // is included here (and second loop will be skipped, avoiding a /0
+ // error there), otherwise scanline y1 is skipped here and handled
+ // in the second loop...which also avoids a /0 error here if y0=y1
+ // (flat-topped triangle).
+ if(y1 == y2)
+ last = y1; // Include y1 scanline
+ else
+ last = y1-1; // Skip it
+
+ for(y=y0; y<=last; y++)
+ {
+ a = x0 + sa / dy01;
+ b = x0 + sb / dy02;
+ sa += dx01;
+ sb += dx02;
+ /* longhand:
+ a = x0 + (x1 - x0) * (y - y0) / (y1 - y0);
+ b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
+ */
+ if(a > b)
+ swap(a,b);
+ drawFastHLine(a, y, b-a+1, color);
+ }
+
+ // For lower part of triangle, find scanline crossings for segments
+ // 0-2 and 1-2. This loop is skipped if y1=y2.
+ sa = dx12 * (y - y1);
+ sb = dx02 * (y - y0);
+ for(; y<=y2; y++)
+ {
+ a = x1 + sa / dy12;
+ b = x0 + sb / dy02;
+ sa += dx12;
+ sb += dx02;
+ /* longhand:
+ a = x1 + (x2 - x1) * (y - y1) / (y2 - y1);
+ b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
+ */
+ if(a > b)
+ swap(a,b);
+ drawFastHLine(a, y, b-a+1, color);
+ }
+}
+
+void Adafruit_GFX::drawBitmap(int16_t x, int16_t y, const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color)
+{
+ for (int16_t j=0; j<h; j++)
+ {
+ for (int16_t i=0; i<w; i++ )
+ {
+ if (bitmap[i + (j/8)*w] & _BV(j%8))
+ drawPixel(x+i, y+j, color);
+ }
+ }
+}
+#endif
+
+size_t Adafruit_GFX::writeChar(uint8_t c)
+{
+ if (c == '\n')
+ {
+ cursor_y += textsize*8;
+ cursor_x = 0;
+ }
+ else if (c == '\r')
+ cursor_x = 0;
+ else
+ {
+ drawChar(cursor_x, cursor_y, c, textcolor, textbgcolor, textsize);
+ cursor_x += textsize*6;
+ if (wrap && (cursor_x > (_width - textsize*6)))
+ {
+ cursor_y += textsize*8;
+ cursor_x = 0;
+ }
+ }
+ return 1;
+}
+
+// draw a character
+void Adafruit_GFX::drawChar(int16_t x, int16_t y, unsigned char c, uint16_t color, uint16_t bg, uint8_t size)
+{
+ if(
+ (x >= _width) || // Clip right
+ (y >= _height) || // Clip bottom
+ ((x + 5 * size - 1) < 0) || // Clip left
+ ((y + 8 * size - 1) < 0) // Clip top
+ )
+ return;
+
+ for (int8_t i=0; i<6; i++ )
+ {
+ uint8_t line = 0;
+
+ if (i == 5)
+ line = 0x0;
+ else
+ line = font[(c*5)+i];
+
+ for (int8_t j = 0; j<8; j++)
+ {
+ if (line & 0x1)
+ {
+#if defined(GFX_WANT_ABSTRACTS) || defined(GFX_SIZEABLE_TEXT)
+ if (size == 1) // default size
+ drawPixel(x+i, y+j, color);
+ else // big size
+ fillRect(x+(i*size), y+(j*size), size, size, color);
+#else
+ drawPixel(x+i, y+j, color);
+#endif
+ }
+ else if (bg != color)
+ {
+#if defined(GFX_WANT_ABSTRACTS) || defined(GFX_SIZEABLE_TEXT)
+ if (size == 1) // default size
+ drawPixel(x+i, y+j, bg);
+ else // big size
+ fillRect(x+i*size, y+j*size, size, size, bg);
+#else
+ drawPixel(x+i, y+j, bg);
+#endif
+ }
+ line >>= 1;
+ }
+ }
+}
+
+void Adafruit_GFX::setRotation(uint8_t x)
+{
+ x %= 4; // cant be higher than 3
+ rotation = x;
+ switch (x)
+ {
+ case 0:
+ case 2:
+ _width = _rawWidth;
+ _height = _rawHeight;
+ break;
+ case 1:
+ case 3:
+ _width = _rawHeight;
+ _height = _rawWidth;
+ break;
+ }
+}
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