A library with drivers for different peripherals on the LPC4088 QuickStart Board or related add-on boards.
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Diff: Adafruit_GFX.cpp
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- 0:0fdadbc3d852
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Adafruit_GFX.cpp Thu Sep 26 06:37:02 2013 +0000 @@ -0,0 +1,479 @@ +/* +This is the core graphics library for all our displays, providing a common +set of graphics primitives (points, lines, circles, etc.). It needs to be +paired with a hardware-specific library for each display device we carry +(to handle the lower-level functions). + +Adafruit invests time and resources providing this open source code, please +support Adafruit & open-source hardware by purchasing products from Adafruit! + +Copyright (c) 2013 Adafruit Industries. All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + +- Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. +- Redistributions in binary form must reproduce the above copyright notice, + this list of conditions and the following disclaimer in the documentation + and/or other materials provided with the distribution. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +POSSIBILITY OF SUCH DAMAGE. + */ + +#include "mbed.h" +#include "Adafruit_GFX.h" +#include "glcdfont.c" +#ifdef __AVR__ +#include <avr/pgmspace.h> +#else +#define pgm_read_byte(addr) (*(const unsigned char *)(addr)) +#endif + +Adafruit_GFX::Adafruit_GFX(int16_t w, int16_t h): +WIDTH(w), HEIGHT(h) +{ + _width = WIDTH; + _height = HEIGHT; + rotation = 0; + cursor_y = cursor_x = 0; + textsize = 1; + textcolor = textbgcolor = 0xFFFF; + wrap = true; +} + +// 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); + } + } +} + +// 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; + } + } +} + +// 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::drawFastVLine(int16_t x, int16_t y, + int16_t h, uint16_t color) { + // Update in subclasses if desired! + drawLine(x, y, x, y+h-1, color); +} + +void Adafruit_GFX::drawFastHLine(int16_t x, int16_t y, + int16_t w, uint16_t color) { + // Update in subclasses if desired! + drawLine(x, y, x+w-1, y, color); +} + +void Adafruit_GFX::fillRect(int16_t x, int16_t y, int16_t w, int16_t h, + uint16_t color) { + // Update in subclasses if desired! + for (int16_t i=x; i<x+w; i++) { + drawFastVLine(i, y, h, 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) { + + int16_t i, j, byteWidth = (w + 7) / 8; + + for(j=0; j<h; j++) { + for(i=0; i<w; i++ ) { + if(pgm_read_byte(bitmap + j * byteWidth + i / 8) & (128 >> (i & 7))) { + drawPixel(x+i, y+j, color); + } + } + } +} + + +size_t Adafruit_GFX::write(uint8_t c) { + if (c == '\n') { + cursor_y += textsize*8; + cursor_x = 0; + } else if (c == '\r') { + // skip em + } 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 + 6 * size - 1) < 0) || // Clip left + ((y + 8 * size - 1) < 0)) // Clip top + return; + + for (int8_t i=0; i<6; i++ ) { + uint8_t line; + if (i == 5) + line = 0x0; + else + line = pgm_read_byte(font+(c*5)+i); + for (int8_t j = 0; j<8; j++) { + if (line & 0x1) { + 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 if (bg != color) { + if (size == 1) // default size + drawPixel(x+i, y+j, bg); + else { // big size + fillRect(x+i*size, y+j*size, size, size, bg); + } + } + line >>= 1; + } + } +} + +void Adafruit_GFX::setCursor(int16_t x, int16_t y) { + cursor_x = x; + cursor_y = y; +} + +void Adafruit_GFX::setTextSize(uint8_t s) { + textsize = (s > 0) ? s : 1; +} + +void Adafruit_GFX::setTextColor(uint16_t c) { + // For 'transparent' background, we'll set the bg + // to the same as fg instead of using a flag + textcolor = textbgcolor = c; +} + +void Adafruit_GFX::setTextColor(uint16_t c, uint16_t b) { + textcolor = c; + textbgcolor = b; +} + +void Adafruit_GFX::setTextWrap(bool w) { + wrap = w; +} + +uint8_t Adafruit_GFX::getRotation(void) { + return rotation; +} + +void Adafruit_GFX::setRotation(uint8_t x) { + rotation = (x & 3); + switch(rotation) { + case 0: + case 2: + _width = WIDTH; + _height = HEIGHT; + break; + case 1: + case 3: + _width = HEIGHT; + _height = WIDTH; + break; + } +} + +// Return the size of the display (per current rotation) +int16_t Adafruit_GFX::width(void) { + return _width; +} + +int16_t Adafruit_GFX::height(void) { + return _height; +} + +void Adafruit_GFX::invertDisplay(bool i) { + // Do nothing, must be subclassed if supported +} + +