Peter Swanson / Adafruit_GFX

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Adafruit_GFX.cpp@0:c16f38158e0e, 2014-11-18 (annotated)

Committer:
peterswanson87
Date:
Tue Nov 18 18:48:49 2014 +0000
Revision:
0:c16f38158e0e
project is compiling with LIS3DH test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
peterswanson87 0:c16f38158e0e 1 /***********************************
peterswanson87 0:c16f38158e0e 2 This is a our graphics core library, for all our displays.
peterswanson87 0:c16f38158e0e 3 We'll be adapting all the
peterswanson87 0:c16f38158e0e 4 existing libaries to use this core to make updating, support
peterswanson87 0:c16f38158e0e 5 and upgrading easier!
peterswanson87 0:c16f38158e0e 6
peterswanson87 0:c16f38158e0e 7 Adafruit invests time and resources providing this open source code,
peterswanson87 0:c16f38158e0e 8 please support Adafruit and open-source hardware by purchasing
peterswanson87 0:c16f38158e0e 9 products from Adafruit!
peterswanson87 0:c16f38158e0e 10
peterswanson87 0:c16f38158e0e 11 Written by Limor Fried/Ladyada for Adafruit Industries.
peterswanson87 0:c16f38158e0e 12 BSD license, check license.txt for more information
peterswanson87 0:c16f38158e0e 13 All text above must be included in any redistribution
peterswanson87 0:c16f38158e0e 14 ****************************************/
peterswanson87 0:c16f38158e0e 15
peterswanson87 0:c16f38158e0e 16 /*
peterswanson87 0:c16f38158e0e 17 * Modified by Neal Horman 7/14/2012 for use in LPC1768
peterswanson87 0:c16f38158e0e 18 */
peterswanson87 0:c16f38158e0e 19
peterswanson87 0:c16f38158e0e 20 #include "mbed.h"
peterswanson87 0:c16f38158e0e 21
peterswanson87 0:c16f38158e0e 22 #include "Adafruit_GFX.h"
peterswanson87 0:c16f38158e0e 23 #include "glcdfont.h"
peterswanson87 0:c16f38158e0e 24
peterswanson87 0:c16f38158e0e 25 #ifdef WANT_ABSTRACTS
peterswanson87 0:c16f38158e0e 26 // draw a circle outline
peterswanson87 0:c16f38158e0e 27 void Adafruit_GFX::drawCircle(int16_t x0, int16_t y0, int16_t r, uint16_t color)
peterswanson87 0:c16f38158e0e 28 {
peterswanson87 0:c16f38158e0e 29 int16_t f = 1 - r;
peterswanson87 0:c16f38158e0e 30 int16_t ddF_x = 1;
peterswanson87 0:c16f38158e0e 31 int16_t ddF_y = -2 * r;
peterswanson87 0:c16f38158e0e 32 int16_t x = 0;
peterswanson87 0:c16f38158e0e 33 int16_t y = r;
peterswanson87 0:c16f38158e0e 34
peterswanson87 0:c16f38158e0e 35 drawPixel(x0, y0+r, color);
peterswanson87 0:c16f38158e0e 36 drawPixel(x0, y0-r, color);
peterswanson87 0:c16f38158e0e 37 drawPixel(x0+r, y0, color);
peterswanson87 0:c16f38158e0e 38 drawPixel(x0-r, y0, color);
peterswanson87 0:c16f38158e0e 39
peterswanson87 0:c16f38158e0e 40 while (x<y)
peterswanson87 0:c16f38158e0e 41 {
peterswanson87 0:c16f38158e0e 42 if (f >= 0)
peterswanson87 0:c16f38158e0e 43 {
peterswanson87 0:c16f38158e0e 44 y--;
peterswanson87 0:c16f38158e0e 45 ddF_y += 2;
peterswanson87 0:c16f38158e0e 46 f += ddF_y;
peterswanson87 0:c16f38158e0e 47 }
peterswanson87 0:c16f38158e0e 48 x++;
peterswanson87 0:c16f38158e0e 49 ddF_x += 2;
peterswanson87 0:c16f38158e0e 50 f += ddF_x;
peterswanson87 0:c16f38158e0e 51
peterswanson87 0:c16f38158e0e 52 drawPixel(x0 + x, y0 + y, color);
peterswanson87 0:c16f38158e0e 53 drawPixel(x0 - x, y0 + y, color);
peterswanson87 0:c16f38158e0e 54 drawPixel(x0 + x, y0 - y, color);
peterswanson87 0:c16f38158e0e 55 drawPixel(x0 - x, y0 - y, color);
peterswanson87 0:c16f38158e0e 56 drawPixel(x0 + y, y0 + x, color);
peterswanson87 0:c16f38158e0e 57 drawPixel(x0 - y, y0 + x, color);
peterswanson87 0:c16f38158e0e 58 drawPixel(x0 + y, y0 - x, color);
peterswanson87 0:c16f38158e0e 59 drawPixel(x0 - y, y0 - x, color);
peterswanson87 0:c16f38158e0e 60 }
peterswanson87 0:c16f38158e0e 61 }
peterswanson87 0:c16f38158e0e 62
peterswanson87 0:c16f38158e0e 63 void Adafruit_GFX::drawCircleHelper( int16_t x0, int16_t y0, int16_t r, uint8_t cornername, uint16_t color)
peterswanson87 0:c16f38158e0e 64 {
peterswanson87 0:c16f38158e0e 65 int16_t f = 1 - r;
peterswanson87 0:c16f38158e0e 66 int16_t ddF_x = 1;
peterswanson87 0:c16f38158e0e 67 int16_t ddF_y = -2 * r;
peterswanson87 0:c16f38158e0e 68 int16_t x = 0;
peterswanson87 0:c16f38158e0e 69 int16_t y = r;
peterswanson87 0:c16f38158e0e 70
peterswanson87 0:c16f38158e0e 71 while (x<y)
peterswanson87 0:c16f38158e0e 72 {
peterswanson87 0:c16f38158e0e 73 if (f >= 0)
peterswanson87 0:c16f38158e0e 74 {
peterswanson87 0:c16f38158e0e 75 y--;
peterswanson87 0:c16f38158e0e 76 ddF_y += 2;
peterswanson87 0:c16f38158e0e 77 f += ddF_y;
peterswanson87 0:c16f38158e0e 78 }
peterswanson87 0:c16f38158e0e 79 x++;
peterswanson87 0:c16f38158e0e 80 ddF_x += 2;
peterswanson87 0:c16f38158e0e 81 f += ddF_x;
peterswanson87 0:c16f38158e0e 82
peterswanson87 0:c16f38158e0e 83 if (cornername & 0x4)
peterswanson87 0:c16f38158e0e 84 {
peterswanson87 0:c16f38158e0e 85 drawPixel(x0 + x, y0 + y, color);
peterswanson87 0:c16f38158e0e 86 drawPixel(x0 + y, y0 + x, color);
peterswanson87 0:c16f38158e0e 87 }
peterswanson87 0:c16f38158e0e 88
peterswanson87 0:c16f38158e0e 89 if (cornername & 0x2)
peterswanson87 0:c16f38158e0e 90 {
peterswanson87 0:c16f38158e0e 91 drawPixel(x0 + x, y0 - y, color);
peterswanson87 0:c16f38158e0e 92 drawPixel(x0 + y, y0 - x, color);
peterswanson87 0:c16f38158e0e 93 }
peterswanson87 0:c16f38158e0e 94
peterswanson87 0:c16f38158e0e 95 if (cornername & 0x8)
peterswanson87 0:c16f38158e0e 96 {
peterswanson87 0:c16f38158e0e 97 drawPixel(x0 - y, y0 + x, color);
peterswanson87 0:c16f38158e0e 98 drawPixel(x0 - x, y0 + y, color);
peterswanson87 0:c16f38158e0e 99 }
peterswanson87 0:c16f38158e0e 100
peterswanson87 0:c16f38158e0e 101 if (cornername & 0x1)
peterswanson87 0:c16f38158e0e 102 {
peterswanson87 0:c16f38158e0e 103 drawPixel(x0 - y, y0 - x, color);
peterswanson87 0:c16f38158e0e 104 drawPixel(x0 - x, y0 - y, color);
peterswanson87 0:c16f38158e0e 105 }
peterswanson87 0:c16f38158e0e 106 }
peterswanson87 0:c16f38158e0e 107 }
peterswanson87 0:c16f38158e0e 108
peterswanson87 0:c16f38158e0e 109 void Adafruit_GFX::fillCircle(int16_t x0, int16_t y0, int16_t r, uint16_t color)
peterswanson87 0:c16f38158e0e 110 {
peterswanson87 0:c16f38158e0e 111 drawFastVLine(x0, y0-r, 2*r+1, color);
peterswanson87 0:c16f38158e0e 112 fillCircleHelper(x0, y0, r, 3, 0, color);
peterswanson87 0:c16f38158e0e 113 }
peterswanson87 0:c16f38158e0e 114
peterswanson87 0:c16f38158e0e 115 // used to do circles and roundrects!
peterswanson87 0:c16f38158e0e 116 void Adafruit_GFX::fillCircleHelper(int16_t x0, int16_t y0, int16_t r, uint8_t cornername, int16_t delta, uint16_t color)
peterswanson87 0:c16f38158e0e 117 {
peterswanson87 0:c16f38158e0e 118 int16_t f = 1 - r;
peterswanson87 0:c16f38158e0e 119 int16_t ddF_x = 1;
peterswanson87 0:c16f38158e0e 120 int16_t ddF_y = -2 * r;
peterswanson87 0:c16f38158e0e 121 int16_t x = 0;
peterswanson87 0:c16f38158e0e 122 int16_t y = r;
peterswanson87 0:c16f38158e0e 123
peterswanson87 0:c16f38158e0e 124 while (x<y)
peterswanson87 0:c16f38158e0e 125 {
peterswanson87 0:c16f38158e0e 126 if (f >= 0)
peterswanson87 0:c16f38158e0e 127 {
peterswanson87 0:c16f38158e0e 128 y--;
peterswanson87 0:c16f38158e0e 129 ddF_y += 2;
peterswanson87 0:c16f38158e0e 130 f += ddF_y;
peterswanson87 0:c16f38158e0e 131 }
peterswanson87 0:c16f38158e0e 132 x++;
peterswanson87 0:c16f38158e0e 133 ddF_x += 2;
peterswanson87 0:c16f38158e0e 134 f += ddF_x;
peterswanson87 0:c16f38158e0e 135
peterswanson87 0:c16f38158e0e 136 if (cornername & 0x1)
peterswanson87 0:c16f38158e0e 137 {
peterswanson87 0:c16f38158e0e 138 drawFastVLine(x0+x, y0-y, 2*y+1+delta, color);
peterswanson87 0:c16f38158e0e 139 drawFastVLine(x0+y, y0-x, 2*x+1+delta, color);
peterswanson87 0:c16f38158e0e 140 }
peterswanson87 0:c16f38158e0e 141
peterswanson87 0:c16f38158e0e 142 if (cornername & 0x2)
peterswanson87 0:c16f38158e0e 143 {
peterswanson87 0:c16f38158e0e 144 drawFastVLine(x0-x, y0-y, 2*y+1+delta, color);
peterswanson87 0:c16f38158e0e 145 drawFastVLine(x0-y, y0-x, 2*x+1+delta, color);
peterswanson87 0:c16f38158e0e 146 }
peterswanson87 0:c16f38158e0e 147 }
peterswanson87 0:c16f38158e0e 148 }
peterswanson87 0:c16f38158e0e 149
peterswanson87 0:c16f38158e0e 150 // bresenham's algorithm - thx wikpedia
peterswanson87 0:c16f38158e0e 151 void Adafruit_GFX::drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color)
peterswanson87 0:c16f38158e0e 152 {
peterswanson87 0:c16f38158e0e 153 int16_t steep = abs(y1 - y0) > abs(x1 - x0);
peterswanson87 0:c16f38158e0e 154
peterswanson87 0:c16f38158e0e 155 if (steep)
peterswanson87 0:c16f38158e0e 156 {
peterswanson87 0:c16f38158e0e 157 swap(x0, y0);
peterswanson87 0:c16f38158e0e 158 swap(x1, y1);
peterswanson87 0:c16f38158e0e 159 }
peterswanson87 0:c16f38158e0e 160
peterswanson87 0:c16f38158e0e 161 if (x0 > x1)
peterswanson87 0:c16f38158e0e 162 {
peterswanson87 0:c16f38158e0e 163 swap(x0, x1);
peterswanson87 0:c16f38158e0e 164 swap(y0, y1);
peterswanson87 0:c16f38158e0e 165 }
peterswanson87 0:c16f38158e0e 166
peterswanson87 0:c16f38158e0e 167 int16_t dx, dy;
peterswanson87 0:c16f38158e0e 168 dx = x1 - x0;
peterswanson87 0:c16f38158e0e 169 dy = abs(y1 - y0);
peterswanson87 0:c16f38158e0e 170
peterswanson87 0:c16f38158e0e 171 int16_t err = dx / 2;
peterswanson87 0:c16f38158e0e 172 int16_t ystep;
peterswanson87 0:c16f38158e0e 173
peterswanson87 0:c16f38158e0e 174 if (y0 < y1)
peterswanson87 0:c16f38158e0e 175 ystep = 1;
peterswanson87 0:c16f38158e0e 176 else
peterswanson87 0:c16f38158e0e 177 ystep = -1;
peterswanson87 0:c16f38158e0e 178
peterswanson87 0:c16f38158e0e 179 for (; x0<=x1; x0++)
peterswanson87 0:c16f38158e0e 180 {
peterswanson87 0:c16f38158e0e 181 if (steep)
peterswanson87 0:c16f38158e0e 182 drawPixel(y0, x0, color);
peterswanson87 0:c16f38158e0e 183 else
peterswanson87 0:c16f38158e0e 184 drawPixel(x0, y0, color);
peterswanson87 0:c16f38158e0e 185
peterswanson87 0:c16f38158e0e 186 err -= dy;
peterswanson87 0:c16f38158e0e 187 if (err < 0)
peterswanson87 0:c16f38158e0e 188 {
peterswanson87 0:c16f38158e0e 189 y0 += ystep;
peterswanson87 0:c16f38158e0e 190 err += dx;
peterswanson87 0:c16f38158e0e 191 }
peterswanson87 0:c16f38158e0e 192 }
peterswanson87 0:c16f38158e0e 193 }
peterswanson87 0:c16f38158e0e 194
peterswanson87 0:c16f38158e0e 195
peterswanson87 0:c16f38158e0e 196 // draw a rectangle
peterswanson87 0:c16f38158e0e 197 void Adafruit_GFX::drawRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color)
peterswanson87 0:c16f38158e0e 198 {
peterswanson87 0:c16f38158e0e 199 drawFastHLine(x, y, w, color);
peterswanson87 0:c16f38158e0e 200 drawFastHLine(x, y+h-1, w, color);
peterswanson87 0:c16f38158e0e 201 drawFastVLine(x, y, h, color);
peterswanson87 0:c16f38158e0e 202 drawFastVLine(x+w-1, y, h, color);
peterswanson87 0:c16f38158e0e 203 }
peterswanson87 0:c16f38158e0e 204
peterswanson87 0:c16f38158e0e 205 void Adafruit_GFX::drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color)
peterswanson87 0:c16f38158e0e 206 {
peterswanson87 0:c16f38158e0e 207 // stupidest version - update in subclasses if desired!
peterswanson87 0:c16f38158e0e 208 drawLine(x, y, x, y+h-1, color);
peterswanson87 0:c16f38158e0e 209 }
peterswanson87 0:c16f38158e0e 210
peterswanson87 0:c16f38158e0e 211 void Adafruit_GFX::drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color)
peterswanson87 0:c16f38158e0e 212 {
peterswanson87 0:c16f38158e0e 213 // stupidest version - update in subclasses if desired!
peterswanson87 0:c16f38158e0e 214 drawLine(x, y, x+w-1, y, color);
peterswanson87 0:c16f38158e0e 215 }
peterswanson87 0:c16f38158e0e 216
peterswanson87 0:c16f38158e0e 217 void Adafruit_GFX::fillRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color)
peterswanson87 0:c16f38158e0e 218 {
peterswanson87 0:c16f38158e0e 219 // stupidest version - update in subclasses if desired!
peterswanson87 0:c16f38158e0e 220 for (int16_t i=x; i<x+w; i++)
peterswanson87 0:c16f38158e0e 221 drawFastVLine(i, y, h, color);
peterswanson87 0:c16f38158e0e 222 }
peterswanson87 0:c16f38158e0e 223
peterswanson87 0:c16f38158e0e 224
peterswanson87 0:c16f38158e0e 225 void Adafruit_GFX::fillScreen(uint16_t color)
peterswanson87 0:c16f38158e0e 226 {
peterswanson87 0:c16f38158e0e 227 fillRect(0, 0, _width, _height, color);
peterswanson87 0:c16f38158e0e 228 }
peterswanson87 0:c16f38158e0e 229
peterswanson87 0:c16f38158e0e 230 // draw a rounded rectangle!
peterswanson87 0:c16f38158e0e 231 void Adafruit_GFX::drawRoundRect(int16_t x, int16_t y, int16_t w, int16_t h, int16_t r, uint16_t color)
peterswanson87 0:c16f38158e0e 232 {
peterswanson87 0:c16f38158e0e 233 // smarter version
peterswanson87 0:c16f38158e0e 234 drawFastHLine(x+r , y , w-2*r, color); // Top
peterswanson87 0:c16f38158e0e 235 drawFastHLine(x+r , y+h-1, w-2*r, color); // Bottom
peterswanson87 0:c16f38158e0e 236 drawFastVLine( x , y+r , h-2*r, color); // Left
peterswanson87 0:c16f38158e0e 237 drawFastVLine( x+w-1, y+r , h-2*r, color); // Right
peterswanson87 0:c16f38158e0e 238 // draw four corners
peterswanson87 0:c16f38158e0e 239 drawCircleHelper(x+r , y+r , r, 1, color);
peterswanson87 0:c16f38158e0e 240 drawCircleHelper(x+w-r-1, y+r , r, 2, color);
peterswanson87 0:c16f38158e0e 241 drawCircleHelper(x+w-r-1, y+h-r-1, r, 4, color);
peterswanson87 0:c16f38158e0e 242 drawCircleHelper(x+r , y+h-r-1, r, 8, color);
peterswanson87 0:c16f38158e0e 243 }
peterswanson87 0:c16f38158e0e 244
peterswanson87 0:c16f38158e0e 245 // fill a rounded rectangle!
peterswanson87 0:c16f38158e0e 246 void Adafruit_GFX::fillRoundRect(int16_t x, int16_t y, int16_t w, int16_t h, int16_t r, uint16_t color)
peterswanson87 0:c16f38158e0e 247 {
peterswanson87 0:c16f38158e0e 248 // smarter version
peterswanson87 0:c16f38158e0e 249 fillRect(x+r, y, w-2*r, h, color);
peterswanson87 0:c16f38158e0e 250
peterswanson87 0:c16f38158e0e 251 // draw four corners
peterswanson87 0:c16f38158e0e 252 fillCircleHelper(x+w-r-1, y+r, r, 1, h-2*r-1, color);
peterswanson87 0:c16f38158e0e 253 fillCircleHelper(x+r , y+r, r, 2, h-2*r-1, color);
peterswanson87 0:c16f38158e0e 254 }
peterswanson87 0:c16f38158e0e 255
peterswanson87 0:c16f38158e0e 256 // draw a triangle!
peterswanson87 0:c16f38158e0e 257 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)
peterswanson87 0:c16f38158e0e 258 {
peterswanson87 0:c16f38158e0e 259 drawLine(x0, y0, x1, y1, color);
peterswanson87 0:c16f38158e0e 260 drawLine(x1, y1, x2, y2, color);
peterswanson87 0:c16f38158e0e 261 drawLine(x2, y2, x0, y0, color);
peterswanson87 0:c16f38158e0e 262 }
peterswanson87 0:c16f38158e0e 263
peterswanson87 0:c16f38158e0e 264 // fill a triangle!
peterswanson87 0:c16f38158e0e 265 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)
peterswanson87 0:c16f38158e0e 266 {
peterswanson87 0:c16f38158e0e 267 int16_t a, b, y, last;
peterswanson87 0:c16f38158e0e 268
peterswanson87 0:c16f38158e0e 269 // Sort coordinates by Y order (y2 >= y1 >= y0)
peterswanson87 0:c16f38158e0e 270 if (y0 > y1)
peterswanson87 0:c16f38158e0e 271 swap(y0, y1); swap(x0, x1);
peterswanson87 0:c16f38158e0e 272
peterswanson87 0:c16f38158e0e 273 if (y1 > y2)
peterswanson87 0:c16f38158e0e 274 swap(y2, y1); swap(x2, x1);
peterswanson87 0:c16f38158e0e 275
peterswanson87 0:c16f38158e0e 276 if (y0 > y1)
peterswanson87 0:c16f38158e0e 277 swap(y0, y1); swap(x0, x1);
peterswanson87 0:c16f38158e0e 278
peterswanson87 0:c16f38158e0e 279
peterswanson87 0:c16f38158e0e 280 if(y0 == y2)
peterswanson87 0:c16f38158e0e 281 { // Handle awkward all-on-same-line case as its own thing
peterswanson87 0:c16f38158e0e 282 a = b = x0;
peterswanson87 0:c16f38158e0e 283 if(x1 < a)
peterswanson87 0:c16f38158e0e 284 a = x1;
peterswanson87 0:c16f38158e0e 285 else if(x1 > b)
peterswanson87 0:c16f38158e0e 286 b = x1;
peterswanson87 0:c16f38158e0e 287
peterswanson87 0:c16f38158e0e 288 if(x2 < a)
peterswanson87 0:c16f38158e0e 289 a = x2;
peterswanson87 0:c16f38158e0e 290 else if(x2 > b) b = x2;
peterswanson87 0:c16f38158e0e 291 drawFastHLine(a, y0, b-a+1, color);
peterswanson87 0:c16f38158e0e 292 return;
peterswanson87 0:c16f38158e0e 293 }
peterswanson87 0:c16f38158e0e 294
peterswanson87 0:c16f38158e0e 295 int16_t
peterswanson87 0:c16f38158e0e 296 dx01 = x1 - x0,
peterswanson87 0:c16f38158e0e 297 dy01 = y1 - y0,
peterswanson87 0:c16f38158e0e 298 dx02 = x2 - x0,
peterswanson87 0:c16f38158e0e 299 dy02 = y2 - y0,
peterswanson87 0:c16f38158e0e 300 dx12 = x2 - x1,
peterswanson87 0:c16f38158e0e 301 dy12 = y2 - y1,
peterswanson87 0:c16f38158e0e 302 sa = 0,
peterswanson87 0:c16f38158e0e 303 sb = 0;
peterswanson87 0:c16f38158e0e 304
peterswanson87 0:c16f38158e0e 305 // For upper part of triangle, find scanline crossings for segments
peterswanson87 0:c16f38158e0e 306 // 0-1 and 0-2. If y1=y2 (flat-bottomed triangle), the scanline y1
peterswanson87 0:c16f38158e0e 307 // is included here (and second loop will be skipped, avoiding a /0
peterswanson87 0:c16f38158e0e 308 // error there), otherwise scanline y1 is skipped here and handled
peterswanson87 0:c16f38158e0e 309 // in the second loop...which also avoids a /0 error here if y0=y1
peterswanson87 0:c16f38158e0e 310 // (flat-topped triangle).
peterswanson87 0:c16f38158e0e 311 if(y1 == y2)
peterswanson87 0:c16f38158e0e 312 last = y1; // Include y1 scanline
peterswanson87 0:c16f38158e0e 313 else
peterswanson87 0:c16f38158e0e 314 last = y1-1; // Skip it
peterswanson87 0:c16f38158e0e 315
peterswanson87 0:c16f38158e0e 316 for(y=y0; y<=last; y++)
peterswanson87 0:c16f38158e0e 317 {
peterswanson87 0:c16f38158e0e 318 a = x0 + sa / dy01;
peterswanson87 0:c16f38158e0e 319 b = x0 + sb / dy02;
peterswanson87 0:c16f38158e0e 320 sa += dx01;
peterswanson87 0:c16f38158e0e 321 sb += dx02;
peterswanson87 0:c16f38158e0e 322 /* longhand:
peterswanson87 0:c16f38158e0e 323 a = x0 + (x1 - x0) * (y - y0) / (y1 - y0);
peterswanson87 0:c16f38158e0e 324 b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
peterswanson87 0:c16f38158e0e 325 */
peterswanson87 0:c16f38158e0e 326 if(a > b)
peterswanson87 0:c16f38158e0e 327 swap(a,b);
peterswanson87 0:c16f38158e0e 328 drawFastHLine(a, y, b-a+1, color);
peterswanson87 0:c16f38158e0e 329 }
peterswanson87 0:c16f38158e0e 330
peterswanson87 0:c16f38158e0e 331 // For lower part of triangle, find scanline crossings for segments
peterswanson87 0:c16f38158e0e 332 // 0-2 and 1-2. This loop is skipped if y1=y2.
peterswanson87 0:c16f38158e0e 333 sa = dx12 * (y - y1);
peterswanson87 0:c16f38158e0e 334 sb = dx02 * (y - y0);
peterswanson87 0:c16f38158e0e 335 for(; y<=y2; y++)
peterswanson87 0:c16f38158e0e 336 {
peterswanson87 0:c16f38158e0e 337 a = x1 + sa / dy12;
peterswanson87 0:c16f38158e0e 338 b = x0 + sb / dy02;
peterswanson87 0:c16f38158e0e 339 sa += dx12;
peterswanson87 0:c16f38158e0e 340 sb += dx02;
peterswanson87 0:c16f38158e0e 341 /* longhand:
peterswanson87 0:c16f38158e0e 342 a = x1 + (x2 - x1) * (y - y1) / (y2 - y1);
peterswanson87 0:c16f38158e0e 343 b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
peterswanson87 0:c16f38158e0e 344 */
peterswanson87 0:c16f38158e0e 345 if(a > b)
peterswanson87 0:c16f38158e0e 346 swap(a,b);
peterswanson87 0:c16f38158e0e 347 drawFastHLine(a, y, b-a+1, color);
peterswanson87 0:c16f38158e0e 348 }
peterswanson87 0:c16f38158e0e 349 }
peterswanson87 0:c16f38158e0e 350 #endif
peterswanson87 0:c16f38158e0e 351
peterswanson87 0:c16f38158e0e 352 void Adafruit_GFX::drawBitmap(int16_t x, int16_t y, const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color)
peterswanson87 0:c16f38158e0e 353 {
peterswanson87 0:c16f38158e0e 354 for (int16_t j=0; j<h; j++)
peterswanson87 0:c16f38158e0e 355 {
peterswanson87 0:c16f38158e0e 356 for (int16_t i=0; i<w; i++ )
peterswanson87 0:c16f38158e0e 357 {
peterswanson87 0:c16f38158e0e 358 if (bitmap[i + (j/8)*w] & _BV(j%8))
peterswanson87 0:c16f38158e0e 359 drawPixel(x+i, y+j, color);
peterswanson87 0:c16f38158e0e 360 }
peterswanson87 0:c16f38158e0e 361 }
peterswanson87 0:c16f38158e0e 362 }
peterswanson87 0:c16f38158e0e 363
peterswanson87 0:c16f38158e0e 364 size_t Adafruit_GFX::writeChar(uint8_t c)
peterswanson87 0:c16f38158e0e 365 {
peterswanson87 0:c16f38158e0e 366 if (c == '\n')
peterswanson87 0:c16f38158e0e 367 {
peterswanson87 0:c16f38158e0e 368 cursor_y += textsize*8;
peterswanson87 0:c16f38158e0e 369 cursor_x = 0;
peterswanson87 0:c16f38158e0e 370 }
peterswanson87 0:c16f38158e0e 371 else if (c == '\r')
peterswanson87 0:c16f38158e0e 372 cursor_x = 0;
peterswanson87 0:c16f38158e0e 373 else
peterswanson87 0:c16f38158e0e 374 {
peterswanson87 0:c16f38158e0e 375 drawChar(cursor_x, cursor_y, c, textcolor, textbgcolor, textsize);
peterswanson87 0:c16f38158e0e 376 cursor_x += textsize*6;
peterswanson87 0:c16f38158e0e 377 if (wrap && (cursor_x > (_width - textsize*6)))
peterswanson87 0:c16f38158e0e 378 {
peterswanson87 0:c16f38158e0e 379 cursor_y += textsize*8;
peterswanson87 0:c16f38158e0e 380 cursor_x = 0;
peterswanson87 0:c16f38158e0e 381 }
peterswanson87 0:c16f38158e0e 382 }
peterswanson87 0:c16f38158e0e 383 return 1;
peterswanson87 0:c16f38158e0e 384 }
peterswanson87 0:c16f38158e0e 385
peterswanson87 0:c16f38158e0e 386 // draw a character
peterswanson87 0:c16f38158e0e 387 void Adafruit_GFX::drawChar(int16_t x, int16_t y, unsigned char c, uint16_t color, uint16_t bg, uint8_t size)
peterswanson87 0:c16f38158e0e 388 {
peterswanson87 0:c16f38158e0e 389 if(
peterswanson87 0:c16f38158e0e 390 (x >= _width) || // Clip right
peterswanson87 0:c16f38158e0e 391 (y >= _height) || // Clip bottom
peterswanson87 0:c16f38158e0e 392 ((x + 5 * size - 1) < 0) || // Clip left
peterswanson87 0:c16f38158e0e 393 ((y + 8 * size - 1) < 0) // Clip top
peterswanson87 0:c16f38158e0e 394 )
peterswanson87 0:c16f38158e0e 395 return;
peterswanson87 0:c16f38158e0e 396
peterswanson87 0:c16f38158e0e 397 for (int8_t i=0; i<6; i++ )
peterswanson87 0:c16f38158e0e 398 {
peterswanson87 0:c16f38158e0e 399 uint8_t line = 0;
peterswanson87 0:c16f38158e0e 400
peterswanson87 0:c16f38158e0e 401 if (i == 5)
peterswanson87 0:c16f38158e0e 402 line = 0x0;
peterswanson87 0:c16f38158e0e 403 else
peterswanson87 0:c16f38158e0e 404 line = font[(c*5)+i];
peterswanson87 0:c16f38158e0e 405
peterswanson87 0:c16f38158e0e 406 for (int8_t j = 0; j<8; j++)
peterswanson87 0:c16f38158e0e 407 {
peterswanson87 0:c16f38158e0e 408 if (line & 0x1)
peterswanson87 0:c16f38158e0e 409 {
peterswanson87 0:c16f38158e0e 410 if (size == 1) // default size
peterswanson87 0:c16f38158e0e 411 drawPixel(x+i, y+j, color);
peterswanson87 0:c16f38158e0e 412 #ifdef WANT_ABSTRACTS
peterswanson87 0:c16f38158e0e 413 else // big size
peterswanson87 0:c16f38158e0e 414 fillRect(x+(i*size), y+(j*size), size, size, color);
peterswanson87 0:c16f38158e0e 415 #endif
peterswanson87 0:c16f38158e0e 416 }
peterswanson87 0:c16f38158e0e 417 else if (bg != color)
peterswanson87 0:c16f38158e0e 418 {
peterswanson87 0:c16f38158e0e 419 if (size == 1) // default size
peterswanson87 0:c16f38158e0e 420 drawPixel(x+i, y+j, bg);
peterswanson87 0:c16f38158e0e 421 #ifdef WANT_ABSTRACTS
peterswanson87 0:c16f38158e0e 422 else // big size
peterswanson87 0:c16f38158e0e 423 fillRect(x+i*size, y+j*size, size, size, bg);
peterswanson87 0:c16f38158e0e 424 #endif
peterswanson87 0:c16f38158e0e 425 }
peterswanson87 0:c16f38158e0e 426 line >>= 1;
peterswanson87 0:c16f38158e0e 427 }
peterswanson87 0:c16f38158e0e 428 }
peterswanson87 0:c16f38158e0e 429 }
peterswanson87 0:c16f38158e0e 430 void Adafruit_GFX::setRotation(uint8_t x)
peterswanson87 0:c16f38158e0e 431 {
peterswanson87 0:c16f38158e0e 432 x %= 4; // cant be higher than 3
peterswanson87 0:c16f38158e0e 433 rotation = x;
peterswanson87 0:c16f38158e0e 434 switch (x)
peterswanson87 0:c16f38158e0e 435 {
peterswanson87 0:c16f38158e0e 436 case 0:
peterswanson87 0:c16f38158e0e 437 case 2:
peterswanson87 0:c16f38158e0e 438 _width = _rawWidth;
peterswanson87 0:c16f38158e0e 439 _height = _rawHeight;
peterswanson87 0:c16f38158e0e 440 break;
peterswanson87 0:c16f38158e0e 441 case 1:
peterswanson87 0:c16f38158e0e 442 case 3:
peterswanson87 0:c16f38158e0e 443 _width = _rawHeight;
peterswanson87 0:c16f38158e0e 444 _height = _rawWidth;
peterswanson87 0:c16f38158e0e 445 break;
peterswanson87 0:c16f38158e0e 446 }
peterswanson87 0:c16f38158e0e 447 }