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Diffstat (limited to 'ArduinoAddons/Arduino_1.5.x/hardware/marlin/avr/libraries/U8glib/utility/u8g_ellipse.c')
| -rwxr-xr-x | ArduinoAddons/Arduino_1.5.x/hardware/marlin/avr/libraries/U8glib/utility/u8g_ellipse.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/ArduinoAddons/Arduino_1.5.x/hardware/marlin/avr/libraries/U8glib/utility/u8g_ellipse.c b/ArduinoAddons/Arduino_1.5.x/hardware/marlin/avr/libraries/U8glib/utility/u8g_ellipse.c new file mode 100755 index 000000000..6c35fdf23 --- /dev/null +++ b/ArduinoAddons/Arduino_1.5.x/hardware/marlin/avr/libraries/U8glib/utility/u8g_ellipse.c @@ -0,0 +1,100 @@ +/* + + u8g_ellipse.c + + Utility to draw empty and filled ellipses. + + Universal 8bit Graphics Library + + Copyright (c) 2011, bjthom@gmail.com + 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. + + Addition to the U8G Library as of 02/29/12 + Adapted from Bresenham's Algorithm and the following websites: + http://free.pages.at/easyfilter/bresenham.html + http://homepage.smc.edu/kennedy_john/belipse.pdf + +*/ + +#include "u8g.h" + + +#ifdef WORK_IN_PROGRESS + +void u8g_DrawEllipseRect(u8g_t *u8g, u8g_uint_t x0, u8g_uint_t y0, u8g_uint_t x1, u8g_uint_t y1) +{ + int a = abs(x1 - x0); + int b = abs(y1 - y0); //get diameters + int b1 = b&1; + long dx = 4*(1-a)*b*b; + long dy = 4*(b1+1)*a*a; + long err = dx+dy+b1*a*a; + long e2; + + if (x0 > x1) { x0 = x1; x1 += a; } + if (y0 > y1) { y0 = y1; } + y0 += (b+1)/2; + y1 = y0-b1; + a *= 8*a; + b1 = 8*b*b; + + do { + u8g_DrawPixel(u8g, x1, y0); + u8g_DrawPixel(u8g, x0, y0); + u8g_DrawPixel(u8g, x0, y1); + u8g_DrawPixel(u8g, x1, y1); + e2 = 2*err; + if (e2 >= dx) { + x0++; + x1--; + err += dx += b1; + } + if (e2 <= dy) { + y0++; + y1--; + err += dy += a; + } + } while (x0 <= x1); + + while (y0-y1 < b) { + u8g_DrawPixel(u8g, x0-1, y0); + u8g_DrawPixel(u8g, x1+1, y0++); + u8g_DrawPixel(u8g, x0-1, y1); + u8g_DrawPixel(u8g, x1+1, y1--); + } +} + +void u8g_DrawEllipse(u8g_t *u8g, u8g_uint_t x0, u8g_uint_t y0, u8g_uint_t xr, u8g_uint_t yr) +{ + u8g_DrawPixel(u8g, x0, y0+yr); + u8g_DrawPixel(u8g, x0, y0-yr); + u8g_DrawPixel(u8g, x0+xr, y0); + u8g_DrawPixel(u8g, x0-xr, y0); +} + +#endif + |