mirror of
https://github.com/adafruit/Adafruit-GFX-Library.git
synced 2024-09-20 17:46:09 -04:00
486 lines
12 KiB
C++
486 lines
12 KiB
C++
/******************************************************************
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This is the core graphics library for all our displays, providing
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basic graphics primitives (points, lines, circles, etc.). It needs
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to be paired with a hardware-specific library for each display
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device we carry (handling the lower-level functions).
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Adafruit invests time and resources providing this open
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source code, please support Adafruit and open-source hardware
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by purchasing products from Adafruit!
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Written by Limor Fried/Ladyada for Adafruit Industries.
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BSD license, check license.txt for more information.
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All text above must be included in any redistribution.
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******************************************************************/
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#include "Adafruit_GFX.h"
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#include "glcdfont.c"
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#include <avr/pgmspace.h>
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void Adafruit_GFX::constructor(int16_t w, int16_t h) {
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_width = WIDTH = w;
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_height = HEIGHT = h;
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rotation = 0;
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cursor_y = cursor_x = 0;
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textsize = 1;
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textcolor = textbgcolor = 0xFFFF;
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wrap = true;
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}
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// draw a circle outline
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void Adafruit_GFX::drawCircle(int16_t x0, int16_t y0, int16_t r,
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uint16_t color) {
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int16_t f = 1 - r;
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int16_t ddF_x = 1;
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int16_t ddF_y = -2 * r;
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int16_t x = 0;
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int16_t y = r;
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drawPixel(x0, y0+r, color);
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drawPixel(x0, y0-r, color);
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drawPixel(x0+r, y0, color);
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drawPixel(x0-r, y0, color);
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while (x<y) {
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if (f >= 0) {
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y--;
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ddF_y += 2;
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f += ddF_y;
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}
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x++;
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ddF_x += 2;
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f += ddF_x;
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drawPixel(x0 + x, y0 + y, color);
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drawPixel(x0 - x, y0 + y, color);
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drawPixel(x0 + x, y0 - y, color);
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drawPixel(x0 - x, y0 - y, color);
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drawPixel(x0 + y, y0 + x, color);
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drawPixel(x0 - y, y0 + x, color);
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drawPixel(x0 + y, y0 - x, color);
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drawPixel(x0 - y, y0 - x, color);
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}
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}
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void Adafruit_GFX::drawCircleHelper( int16_t x0, int16_t y0,
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int16_t r, uint8_t cornername, uint16_t color) {
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int16_t f = 1 - r;
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int16_t ddF_x = 1;
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int16_t ddF_y = -2 * r;
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int16_t x = 0;
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int16_t y = r;
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while (x<y) {
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if (f >= 0) {
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y--;
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ddF_y += 2;
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f += ddF_y;
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}
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x++;
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ddF_x += 2;
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f += ddF_x;
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if (cornername & 0x4) {
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drawPixel(x0 + x, y0 + y, color);
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drawPixel(x0 + y, y0 + x, color);
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}
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if (cornername & 0x2) {
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drawPixel(x0 + x, y0 - y, color);
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drawPixel(x0 + y, y0 - x, color);
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}
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if (cornername & 0x8) {
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drawPixel(x0 - y, y0 + x, color);
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drawPixel(x0 - x, y0 + y, color);
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}
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if (cornername & 0x1) {
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drawPixel(x0 - y, y0 - x, color);
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drawPixel(x0 - x, y0 - y, color);
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}
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}
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}
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void Adafruit_GFX::fillCircle(int16_t x0, int16_t y0, int16_t r,
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uint16_t color) {
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drawFastVLine(x0, y0-r, 2*r+1, color);
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fillCircleHelper(x0, y0, r, 3, 0, color);
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}
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// used to do circles and roundrects!
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void Adafruit_GFX::fillCircleHelper(int16_t x0, int16_t y0, int16_t r,
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uint8_t cornername, int16_t delta, uint16_t color) {
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int16_t f = 1 - r;
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int16_t ddF_x = 1;
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int16_t ddF_y = -2 * r;
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int16_t x = 0;
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int16_t y = r;
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while (x<y) {
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if (f >= 0) {
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y--;
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ddF_y += 2;
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f += ddF_y;
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}
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x++;
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ddF_x += 2;
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f += ddF_x;
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if (cornername & 0x1) {
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drawFastVLine(x0+x, y0-y, 2*y+1+delta, color);
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drawFastVLine(x0+y, y0-x, 2*x+1+delta, color);
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}
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if (cornername & 0x2) {
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drawFastVLine(x0-x, y0-y, 2*y+1+delta, color);
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drawFastVLine(x0-y, y0-x, 2*x+1+delta, color);
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}
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}
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}
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// bresenham's algorithm - thx wikpedia
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void Adafruit_GFX::drawLine(int16_t x0, int16_t y0,
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int16_t x1, int16_t y1,
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uint16_t color) {
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int16_t steep = abs(y1 - y0) > abs(x1 - x0);
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if (steep) {
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swap(x0, y0);
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swap(x1, y1);
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}
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if (x0 > x1) {
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swap(x0, x1);
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swap(y0, y1);
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}
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int16_t dx, dy;
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dx = x1 - x0;
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dy = abs(y1 - y0);
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int16_t err = dx / 2;
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int16_t ystep;
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if (y0 < y1) {
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ystep = 1;
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} else {
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ystep = -1;
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}
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for (; x0<=x1; x0++) {
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if (steep) {
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drawPixel(y0, x0, color);
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} else {
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drawPixel(x0, y0, color);
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}
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err -= dy;
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if (err < 0) {
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y0 += ystep;
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err += dx;
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}
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}
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}
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// draw a rectangle
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void Adafruit_GFX::drawRect(int16_t x, int16_t y,
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int16_t w, int16_t h,
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uint16_t color) {
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drawFastHLine(x, y, w, color);
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drawFastHLine(x, y+h-1, w, color);
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drawFastVLine(x, y, h, color);
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drawFastVLine(x+w-1, y, h, color);
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}
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void Adafruit_GFX::drawFastVLine(int16_t x, int16_t y,
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int16_t h, uint16_t color) {
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// stupidest version - update in subclasses if desired!
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drawLine(x, y, x, y+h-1, color);
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}
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void Adafruit_GFX::drawFastHLine(int16_t x, int16_t y,
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int16_t w, uint16_t color) {
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// stupidest version - update in subclasses if desired!
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drawLine(x, y, x+w-1, y, color);
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}
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void Adafruit_GFX::fillRect(int16_t x, int16_t y, int16_t w, int16_t h,
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uint16_t color) {
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// stupidest version - update in subclasses if desired!
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for (int16_t i=x; i<x+w; i++) {
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drawFastVLine(i, y, h, color);
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}
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}
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void Adafruit_GFX::fillScreen(uint16_t color) {
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fillRect(0, 0, _width, _height, color);
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}
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// draw a rounded rectangle!
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void Adafruit_GFX::drawRoundRect(int16_t x, int16_t y, int16_t w,
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int16_t h, int16_t r, uint16_t color) {
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// smarter version
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drawFastHLine(x+r , y , w-2*r, color); // Top
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drawFastHLine(x+r , y+h-1, w-2*r, color); // Bottom
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drawFastVLine( x , y+r , h-2*r, color); // Left
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drawFastVLine( x+w-1, y+r , h-2*r, color); // Right
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// draw four corners
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drawCircleHelper(x+r , y+r , r, 1, color);
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drawCircleHelper(x+w-r-1, y+r , r, 2, color);
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drawCircleHelper(x+w-r-1, y+h-r-1, r, 4, color);
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drawCircleHelper(x+r , y+h-r-1, r, 8, color);
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}
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// fill a rounded rectangle!
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void Adafruit_GFX::fillRoundRect(int16_t x, int16_t y, int16_t w,
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int16_t h, int16_t r, uint16_t color) {
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// smarter version
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fillRect(x+r, y, w-2*r, h, color);
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// draw four corners
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fillCircleHelper(x+w-r-1, y+r, r, 1, h-2*r-1, color);
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fillCircleHelper(x+r , y+r, r, 2, h-2*r-1, color);
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}
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// draw a triangle!
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void Adafruit_GFX::drawTriangle(int16_t x0, int16_t y0,
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int16_t x1, int16_t y1,
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int16_t x2, int16_t y2, uint16_t color) {
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drawLine(x0, y0, x1, y1, color);
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drawLine(x1, y1, x2, y2, color);
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drawLine(x2, y2, x0, y0, color);
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}
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// fill a triangle!
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void Adafruit_GFX::fillTriangle ( int16_t x0, int16_t y0,
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int16_t x1, int16_t y1,
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int16_t x2, int16_t y2, uint16_t color) {
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int16_t a, b, y, last;
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// Sort coordinates by Y order (y2 >= y1 >= y0)
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if (y0 > y1) {
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swap(y0, y1); swap(x0, x1);
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}
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if (y1 > y2) {
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swap(y2, y1); swap(x2, x1);
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}
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if (y0 > y1) {
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swap(y0, y1); swap(x0, x1);
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}
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if(y0 == y2) { // Handle awkward all-on-same-line case as its own thing
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a = b = x0;
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if(x1 < a) a = x1;
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else if(x1 > b) b = x1;
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if(x2 < a) a = x2;
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else if(x2 > b) b = x2;
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drawFastHLine(a, y0, b-a+1, color);
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return;
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}
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int16_t
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dx01 = x1 - x0,
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dy01 = y1 - y0,
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dx02 = x2 - x0,
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dy02 = y2 - y0,
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dx12 = x2 - x1,
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dy12 = y2 - y1,
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sa = 0,
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sb = 0;
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// For upper part of triangle, find scanline crossings for segments
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// 0-1 and 0-2. If y1=y2 (flat-bottomed triangle), the scanline y1
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// is included here (and second loop will be skipped, avoiding a /0
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// error there), otherwise scanline y1 is skipped here and handled
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// in the second loop...which also avoids a /0 error here if y0=y1
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// (flat-topped triangle).
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if(y1 == y2) last = y1; // Include y1 scanline
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else last = y1-1; // Skip it
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for(y=y0; y<=last; y++) {
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a = x0 + sa / dy01;
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b = x0 + sb / dy02;
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sa += dx01;
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sb += dx02;
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/* longhand:
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a = x0 + (x1 - x0) * (y - y0) / (y1 - y0);
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b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
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*/
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if(a > b) swap(a,b);
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drawFastHLine(a, y, b-a+1, color);
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}
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// For lower part of triangle, find scanline crossings for segments
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// 0-2 and 1-2. This loop is skipped if y1=y2.
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sa = dx12 * (y - y1);
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sb = dx02 * (y - y0);
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for(; y<=y2; y++) {
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a = x1 + sa / dy12;
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b = x0 + sb / dy02;
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sa += dx12;
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sb += dx02;
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/* longhand:
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a = x1 + (x2 - x1) * (y - y1) / (y2 - y1);
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b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
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*/
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if(a > b) swap(a,b);
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drawFastHLine(a, y, b-a+1, color);
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}
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}
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void Adafruit_GFX::drawBitmap(int16_t x, int16_t y,
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const uint8_t *bitmap, int16_t w, int16_t h,
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uint16_t color) {
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int16_t i, j, byteWidth = (w + 7) / 8;
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for(j=0; j<h; j++) {
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for(i=0; i<w; i++ ) {
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if(pgm_read_byte(bitmap + j * byteWidth + i / 8) & (128 >> (i & 7))) {
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drawPixel(x+i, y+j, color);
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}
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}
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}
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}
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void Adafruit_GFX::drawBitmap(int16_t x, int16_t y,
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const uint8_t *bitmap, int16_t w, int16_t h,
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uint16_t color, uint16_t bg) {
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int16_t i, j, byteWidth = (w + 7) / 8;
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for(j=0; j<h; j++) {
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for(i=0; i<w; i++ ) {
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if(pgm_read_byte(bitmap + j * byteWidth + i / 8) & (128 >> (i & 7))) {
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drawPixel(x+i, y+j, color);
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}
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else {
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drawPixel(x+i, y+j, bg);
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}
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}
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}
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}
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#if ARDUINO >= 100
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size_t Adafruit_GFX::write(uint8_t c) {
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#else
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void Adafruit_GFX::write(uint8_t c) {
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#endif
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if (c == '\n') {
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cursor_y += textsize*8;
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cursor_x = 0;
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} else if (c == '\r') {
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// skip em
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} else {
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drawChar(cursor_x, cursor_y, c, textcolor, textbgcolor, textsize);
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cursor_x += textsize*6;
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if (wrap && (cursor_x > (_width - textsize*6))) {
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cursor_y += textsize*8;
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cursor_x = 0;
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}
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}
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#if ARDUINO >= 100
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return 1;
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#endif
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}
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// draw a character
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void Adafruit_GFX::drawChar(int16_t x, int16_t y, unsigned char c,
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uint16_t color, uint16_t bg, uint8_t size) {
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if((x >= _width) || // Clip right
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(y >= _height) || // Clip bottom
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((x + 5 * size - 1) < 0) || // Clip left
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((y + 8 * size - 1) < 0)) // Clip top
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return;
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for (int8_t i=0; i<6; i++ ) {
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uint8_t line;
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if (i == 5)
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line = 0x0;
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else
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line = pgm_read_byte(font+(c*5)+i);
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for (int8_t j = 0; j<8; j++) {
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if (line & 0x1) {
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if (size == 1) // default size
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drawPixel(x+i, y+j, color);
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else { // big size
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fillRect(x+(i*size), y+(j*size), size, size, color);
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}
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} else if (bg != color) {
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if (size == 1) // default size
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drawPixel(x+i, y+j, bg);
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else { // big size
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fillRect(x+i*size, y+j*size, size, size, bg);
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}
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}
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line >>= 1;
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}
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}
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}
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void Adafruit_GFX::setCursor(int16_t x, int16_t y) {
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cursor_x = x;
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cursor_y = y;
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}
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void Adafruit_GFX::setTextSize(uint8_t s) {
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textsize = (s > 0) ? s : 1;
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}
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void Adafruit_GFX::setTextColor(uint16_t c) {
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textcolor = c;
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textbgcolor = c;
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// for 'transparent' background, we'll set the bg
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// to the same as fg instead of using a flag
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}
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void Adafruit_GFX::setTextColor(uint16_t c, uint16_t b) {
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textcolor = c;
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textbgcolor = b;
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}
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void Adafruit_GFX::setTextWrap(boolean w) {
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wrap = w;
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}
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uint8_t Adafruit_GFX::getRotation(void) {
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rotation %= 4;
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return rotation;
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}
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void Adafruit_GFX::setRotation(uint8_t x) {
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x %= 4; // cant be higher than 3
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rotation = x;
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switch (x) {
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case 0:
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case 2:
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_width = WIDTH;
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_height = HEIGHT;
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break;
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case 1:
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case 3:
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_width = HEIGHT;
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_height = WIDTH;
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break;
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}
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}
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void Adafruit_GFX::invertDisplay(boolean i) {
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// do nothing, can be subclassed
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}
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// return the size of the display which depends on the rotation!
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int16_t Adafruit_GFX::width(void) {
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return _width;
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}
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int16_t Adafruit_GFX::height(void) {
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return _height;
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}
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