Adafruit_GFX.h

00001 /***********************************
00002 This is a our graphics core library, for all our displays. 
00003 We'll be adapting all the
00004 existing libaries to use this core to make updating, support 
00005 and upgrading easier!
00006 
00007 Adafruit invests time and resources providing this open source code, 
00008 please support Adafruit and open-source hardware by purchasing 
00009 products from Adafruit!
00010 
00011 Written by Limor Fried/Ladyada  for Adafruit Industries.  
00012 BSD license, check license.txt for more information
00013 All text above must be included in any redistribution
00014 ****************************************/
00015 
00016 /*
00017  *  Modified by Neal Horman 7/14/2012 for use in LPC1768
00018  */
00019 
00020 #ifndef _ADAFRUIT_GFX_H_
00021 #define _ADAFRUIT_GFX_H_
00022 
00023 static inline void swap(int16_t &a, int16_t &b)
00024 {
00025     int16_t t = a;
00026     
00027     a = b;
00028     b = t;
00029 }
00030 
00031 #ifndef _BV
00032 #define _BV(bit) (1<<(bit))
00033 #endif
00034 
00035 #define BLACK 0
00036 #define WHITE 1
00037 
00038 // The WANT_AVSTRACTS define allows text sizes other than 1 to be selected
00039 #define WANT_ABSTRACTS
00040 
00041 class Adafruit_GFX : public Stream
00042 {
00043  public:
00044     Adafruit_GFX(int16_t w, int16_t h)
00045         : _rawWidth(w)
00046         , _rawHeight(h)
00047         , _width(w)
00048         , _height(h)
00049         , cursor_x(0)
00050         , cursor_y(0)
00051         , textcolor(WHITE)
00052         , textbgcolor(BLACK)
00053         , textsize(1)
00054         , rotation(0)
00055         , wrap(true)
00056         {};
00057 
00058     // this must be defined by the subclass
00059     virtual void drawPixel(int16_t x, int16_t y, uint16_t color) = 0;
00060     // this is optional
00061     virtual void invertDisplay(bool i) {};
00062     
00063     // Stream implementation - provides printf() interface
00064     // You would otherwise be forced to use writeChar()
00065     virtual int _putc(int value) { return writeChar(value); };
00066     virtual int _getc() { return -1; };
00067 
00068 #ifdef WANT_ABSTRACTS
00069     // these are 'generic' drawing functions, so we can share them!
00070     virtual void drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color);
00071     virtual void drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color);
00072     virtual void drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color);
00073     virtual void drawRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color);
00074     virtual void fillRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color);
00075     virtual void fillScreen(uint16_t color);
00076 
00077     void drawCircle(int16_t x0, int16_t y0, int16_t r, uint16_t color);
00078     void drawCircleHelper(int16_t x0, int16_t y0, int16_t r, uint8_t cornername, uint16_t color);
00079     void fillCircle(int16_t x0, int16_t y0, int16_t r, uint16_t color);
00080     void fillCircleHelper(int16_t x0, int16_t y0, int16_t r, uint8_t cornername, int16_t delta, uint16_t color);
00081 
00082     void drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint16_t color);
00083     void fillTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint16_t color);
00084     void drawRoundRect(int16_t x0, int16_t y0, int16_t w, int16_t h, int16_t radius, uint16_t color);
00085     void fillRoundRect(int16_t x0, int16_t y0, int16_t w, int16_t h, int16_t radius, uint16_t color);
00086 #endif
00087 
00088     void drawBitmap(int16_t x, int16_t y, const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color);
00089     void drawChar(int16_t x, int16_t y, unsigned char c, uint16_t color, uint16_t bg, uint8_t size);
00090     size_t writeChar(uint8_t);
00091 
00092     int16_t width(void) { return _width; };
00093     int16_t height(void) { return _height; };
00094 
00095     void setCursor(int16_t x, int16_t y) { cursor_x = x; cursor_y = y; };
00096     void setTextSize(uint8_t s) { textsize = (s > 0) ? s : 1; };
00097     void setTextColor(uint16_t c) { textcolor = c; textbgcolor = c; }
00098     void setTextColor(uint16_t c, uint16_t b) { textcolor = c; textbgcolor = b; };
00099     void setTextWrap(bool w) { wrap = w; };
00100 
00101     void setRotation(uint8_t r);
00102     uint8_t getRotation(void) { rotation %= 4; return rotation; }; 
00103 
00104 protected:
00105     int16_t  _rawWidth, _rawHeight;   // this is the 'raw' display w/h - never changes
00106     int16_t  _width, _height; // dependent on rotation
00107     int16_t  cursor_x, cursor_y;
00108     uint16_t textcolor, textbgcolor;
00109     uint8_t  textsize;
00110     uint8_t  rotation;
00111     bool  wrap; // If set, 'wrap' text at right edge of display
00112 };
00113 
00114 #endif