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@ladyada
ladyada committed Mar 13, 2012
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223 changes: 223 additions & 0 deletions Adafruit_GFX.cpp
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#include "Adafruit_GFX.h"
#include "glcdfont.c"
#include <avr/pgmspace.h>

// draw a circle outline
void Adafruit_GFX::drawCircle(uint8_t x0, uint8_t y0, uint8_t r,
uint8_t color) {
int8_t f = 1 - r;
int8_t ddF_x = 1;
int8_t ddF_y = -2 * r;
int8_t x = 0;
int8_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::fillCircle(uint8_t x0, uint8_t y0, uint8_t r,
uint8_t color) {
int8_t f = 1 - r;
int8_t ddF_x = 1;
int8_t ddF_y = -2 * r;
int8_t x = 0;
int8_t y = r;

drawFastVLine(x0, y0-r, r*2+1, color);

while (x<y) {
if (f >= 0) {
y--;
ddF_y += 2;
f += ddF_y;
}
x++;
ddF_x += 2;
f += ddF_x;

drawFastVLine(x0+x, y0-y, y*2+1, color);
drawFastVLine(x0-x, y0-y, y*2+1, color);

drawFastVLine(x0+y, y0-x, x*2+1, color);
drawFastVLine(x0-y, y0-x, x*2+1, color);
}
}

// bresenham's algorithm - thx wikpedia
void Adafruit_GFX::drawLine(int16_t x0, int16_t y0,
int16_t x1, int16_t y1,
uint8_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(uint8_t x, uint8_t y,
uint8_t w, uint8_t h,
uint8_t color) {
// stupidest version - update in subclasses if desired!
for (uint8_t i=x; i<x+w; i++) {
drawPixel(i, y, color);
drawPixel(i, y+h-1, color);
}
drawFastVLine(x, y, h, color);
drawFastVLine(x+w-1, y, h, color);
}

void Adafruit_GFX::drawFastVLine(uint8_t x, uint8_t y,
uint8_t h, uint8_t color) {
// stupidest version - update in subclasses if desired!
for (uint8_t j=y; j<y+h; j++) {
drawPixel(x, j, color);
}
}

void Adafruit_GFX::fillRect(uint8_t x, uint8_t y, uint8_t w, uint8_t h,
uint8_t color) {
// stupidest version - update in subclasses if desired!
for (uint8_t i=x; i<x+w; i++) {
drawFastVLine(i, y, h, color);
}
}

void Adafruit_GFX::drawBitmap(uint8_t x, uint8_t y,
const uint8_t *bitmap, uint8_t w, uint8_t h,
uint8_t color) {
for (uint8_t j=0; j<h; j++) {
for (uint8_t i=0; i<w; i++ ) {
if (pgm_read_byte(bitmap + i + (j/8)*w) & _BV(j%8)) {
drawPixel(x+i, y+j, color);
}
}
}
}


#if ARDUINO >= 100
size_t Adafruit_GFX::write(uint8_t c) {
#else
void Adafruit_GFX::write(uint8_t c) {
#endif
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 ARDUINO >= 100
return 1;
#endif
}

// draw a character
void Adafruit_GFX::drawChar(uint8_t x, uint8_t y, char c,
uint16_t color, uint16_t bg, uint8_t size) {
for (uint8_t i=0; i<6; i++ ) {
uint8_t line;
if (i == 5)
line = 0x0;
else
line = pgm_read_byte(font+(c*5)+i);
for (uint8_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(uint16_t x, uint16_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) {
textcolor = c;
textbgcolor = c;
// for 'transparent' background, we'll set the bg
// to the same as fg instead of using a flag
}

void Adafruit_GFX::setTextColor(uint16_t c, uint16_t b) {
textcolor = c;
textbgcolor = b;
}
58 changes: 58 additions & 0 deletions Adafruit_GFX.h
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#ifndef _ADAFRUIT_GFX_H
#define _ADAFRUIT_GFX_H

#if ARDUINO >= 100
#include "Arduino.h"
#include "Print.h"
#else
#include "WProgram.h"
#endif

#define swap(a, b) { int16_t t = a; a = b; b = t; }

class Adafruit_GFX : public Print{
public:
// this must be defined by the subclass
virtual void drawPixel(uint8_t x, uint8_t y, uint8_t color);

// these are 'generic' drawing functions, so we can share them!
void drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1,
uint8_t color);
virtual void drawFastVLine(uint8_t x, uint8_t y, uint8_t h, uint8_t color);
void drawRect(uint8_t x, uint8_t y, uint8_t w, uint8_t h,
uint8_t color);
void fillRect(uint8_t x, uint8_t y, uint8_t w, uint8_t h,
uint8_t color);

void drawCircle(uint8_t x0, uint8_t y0, uint8_t r,
uint8_t color);
void fillCircle(uint8_t x0, uint8_t y0, uint8_t r,
uint8_t color);

void drawBitmap(uint8_t x, uint8_t y,
const uint8_t *bitmap, uint8_t w, uint8_t h,
uint8_t color);
void drawChar(uint8_t x, uint8_t y, char c,
uint16_t color, uint16_t bg, uint8_t size);
#if ARDUINO >= 100
virtual size_t write(uint8_t);
#else
virtual void write(uint8_t);
#endif
void setCursor(uint16_t x, uint16_t y);
void setTextColor(uint16_t c);
void setTextColor(uint16_t c, uint16_t bg);
void setTextSize(uint8_t s);


// return the size of the display
uint16_t width() { return WIDTH; }
uint16_t height() { return HEIGHT; }

protected:
uint16_t WIDTH, HEIGHT;
uint16_t cursor_x, cursor_y, textcolor, textbgcolor;
uint8_t textsize;
};

#endif

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