Diff: Adafruit_GFX.cpp

Revision:

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
+}
+
+