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383 lines
9.1 KiB
C
383 lines
9.1 KiB
C
/*
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u8g_circle.c
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Utility to draw empty and filled circles.
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Universal 8bit Graphics Library
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Copyright (c) 2011, bjthom@gmail.com
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u8g_DrawCircle & u8g_DrawDisc by olikraus@gmail.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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Addition to the U8G Library 02/25/12
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*/
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#include "u8g.h"
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#ifdef OLD_CODE
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void circ_upperRight(u8g_t *u8g, u8g_uint_t x, u8g_uint_t y, u8g_uint_t x0, u8g_uint_t y0) {
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u8g_DrawPixel(u8g, x0 + x, y0 - y);
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u8g_DrawPixel(u8g, x0 + y, y0 - x);
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}
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void circ_upperLeft(u8g_t *u8g, u8g_uint_t x, u8g_uint_t y, u8g_uint_t x0, u8g_uint_t y0) {
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u8g_DrawPixel(u8g, x0 - x, y0 - y);
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u8g_DrawPixel(u8g, x0 - y, y0 - x);
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}
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void circ_lowerRight(u8g_t *u8g, u8g_uint_t x, u8g_uint_t y, u8g_uint_t x0, u8g_uint_t y0) {
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u8g_DrawPixel(u8g, x0 + x, y0 + y);
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u8g_DrawPixel(u8g, x0 + y, y0 + x);
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}
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void circ_lowerLeft(u8g_t *u8g, u8g_uint_t x, u8g_uint_t y, u8g_uint_t x0, u8g_uint_t y0) {
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u8g_DrawPixel(u8g, x0 - x, y0 + y);
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u8g_DrawPixel(u8g, x0 - y, y0 + x);
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}
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void circ_all(u8g_t *u8g, u8g_uint_t x, u8g_uint_t y, u8g_uint_t x0, u8g_uint_t y0) {
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circ_upperRight(u8g, x, y, x0, y0);
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circ_upperLeft(u8g, x, y, x0, y0);
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circ_lowerRight(u8g, x, y, x0, y0);
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circ_lowerLeft(u8g, x, y, x0, y0);
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}
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void u8g_DrawEmpCirc(u8g_t *u8g, u8g_uint_t x0, u8g_uint_t y0, u8g_uint_t rad, uint8_t option)
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{
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if ( u8g_IsBBXIntersection(u8g, x0-rad-1, y0-rad-1, 2*rad+1, 2*rad+1) == 0)
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return;
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int f = 1 - rad;
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int ddF_x = 1;
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int ddF_y = -2*rad;
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uint8_t x = 0;
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uint8_t y = rad;
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void ( *circ_util )(u8g_t *, u8g_uint_t, u8g_uint_t, u8g_uint_t, u8g_uint_t);
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switch (option)
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{
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case U8G_CIRC_UPPER_RIGHT:
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u8g_DrawPixel(u8g, x0, y0 - rad);
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u8g_DrawPixel(u8g, x0 + rad, y0);
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circ_util = circ_upperRight;
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break;
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case U8G_CIRC_UPPER_LEFT:
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u8g_DrawPixel(u8g, x0, y0 - rad);
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u8g_DrawPixel(u8g, x0 - rad, y0);
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circ_util = circ_upperLeft;
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break;
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case U8G_CIRC_LOWER_RIGHT:
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u8g_DrawPixel(u8g, x0, y0 + rad);
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u8g_DrawPixel(u8g, x0 + rad, y0);
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circ_util = circ_lowerRight;
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break;
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case U8G_CIRC_LOWER_LEFT:
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u8g_DrawPixel(u8g, x0, y0 + rad);
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u8g_DrawPixel(u8g, x0 - rad, y0);
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circ_util = circ_lowerLeft;
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break;
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default:
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case U8G_CIRC_ALL:
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u8g_DrawPixel(u8g, x0, y0 + rad);
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u8g_DrawPixel(u8g, x0, y0 - rad);
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u8g_DrawPixel(u8g, x0 + rad, y0);
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u8g_DrawPixel(u8g, x0 - rad, y0);
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circ_util = circ_all;
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break;
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}
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while( x < y )
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{
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if(f >= 0)
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{
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y--;
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ddF_y += 2;
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f += ddF_y;
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}
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x++;
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ddF_x += 2;
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f += ddF_x;
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circ_util(u8g, x, y, x0, y0);
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}
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}
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void u8g_DrawFillCirc(u8g_t *u8g, u8g_uint_t x0, u8g_uint_t y0, u8g_uint_t rad, uint8_t option)
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{
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if ( u8g_IsBBXIntersection(u8g, x0-rad-1, y0-rad-1, 2*rad+1, 2*rad+1) == 0)
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return;
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int f = 1 - rad;
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int ddF_x = 1;
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int ddF_y = -2*rad;
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uint8_t x = 0;
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uint8_t y = rad;
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// Draw vertical diameter at the horiz. center
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// u8g_DrawVLine(u8g, x0, y0 - rad, 2*rad+1);
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if (option == U8G_CIRC_UPPER_LEFT || option == U8G_CIRC_UPPER_RIGHT) {
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u8g_DrawVLine(u8g, x0, y0 - rad, rad+1);
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}
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else if (option == U8G_CIRC_LOWER_LEFT || option == U8G_CIRC_LOWER_RIGHT) {
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u8g_DrawVLine(u8g, x0, y0, rad+1);
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}
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else {
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u8g_DrawVLine(u8g, x0, y0 - rad, 2*rad+1);
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}
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while( x < y )
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{
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if(f >= 0)
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{
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y--;
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ddF_y += 2;
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f += ddF_y;
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}
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x++;
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ddF_x += 2;
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f += ddF_x;
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//Draw vertical lines from one point to another
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switch (option)
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{
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case U8G_CIRC_UPPER_RIGHT:
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u8g_DrawVLine(u8g, x0+x, y0-y, y+1);
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u8g_DrawVLine(u8g, x0+y, y0-x, x+1);
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break;
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case U8G_CIRC_UPPER_LEFT:
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u8g_DrawVLine(u8g, x0-x, y0-y, y+1);
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u8g_DrawVLine(u8g, x0-y, y0-x, x+1);
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break;
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case U8G_CIRC_LOWER_RIGHT:
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u8g_DrawVLine(u8g, x0+x, y0, y+1);
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u8g_DrawVLine(u8g, x0+y, y0, x+1);
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break;
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case U8G_CIRC_LOWER_LEFT:
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u8g_DrawVLine(u8g, x0-x, y0, y+1);
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u8g_DrawVLine(u8g, x0-y, y0, x+1);
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break;
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case U8G_CIRC_ALL:
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u8g_DrawVLine(u8g, x0+x, y0-y, 2*y+1);
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u8g_DrawVLine(u8g, x0-x, y0-y, 2*y+1);
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u8g_DrawVLine(u8g, x0+y, y0-x, 2*x+1);
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u8g_DrawVLine(u8g, x0-y, y0-x, 2*x+1);
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break;
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}
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}
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}
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#endif
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/*=========================================================================*/
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static void u8g_draw_circle_section(u8g_t *u8g, u8g_uint_t x, u8g_uint_t y, u8g_uint_t x0, u8g_uint_t y0, uint8_t option) U8G_NOINLINE;
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static void u8g_draw_circle_section(u8g_t *u8g, u8g_uint_t x, u8g_uint_t y, u8g_uint_t x0, u8g_uint_t y0, uint8_t option)
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{
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/* upper right */
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if ( option & U8G_DRAW_UPPER_RIGHT )
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{
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u8g_DrawPixel(u8g, x0 + x, y0 - y);
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u8g_DrawPixel(u8g, x0 + y, y0 - x);
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}
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/* upper left */
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if ( option & U8G_DRAW_UPPER_LEFT )
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{
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u8g_DrawPixel(u8g, x0 - x, y0 - y);
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u8g_DrawPixel(u8g, x0 - y, y0 - x);
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}
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/* lower right */
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if ( option & U8G_DRAW_LOWER_RIGHT )
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{
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u8g_DrawPixel(u8g, x0 + x, y0 + y);
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u8g_DrawPixel(u8g, x0 + y, y0 + x);
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}
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/* lower left */
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if ( option & U8G_DRAW_LOWER_LEFT )
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{
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u8g_DrawPixel(u8g, x0 - x, y0 + y);
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u8g_DrawPixel(u8g, x0 - y, y0 + x);
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}
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}
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void u8g_draw_circle(u8g_t *u8g, u8g_uint_t x0, u8g_uint_t y0, u8g_uint_t rad, uint8_t option)
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{
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u8g_int_t f;
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u8g_int_t ddF_x;
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u8g_int_t ddF_y;
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u8g_uint_t x;
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u8g_uint_t y;
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f = 1;
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f -= rad;
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ddF_x = 1;
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ddF_y = 0;
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ddF_y -= rad;
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ddF_y *= 2;
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x = 0;
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y = rad;
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u8g_draw_circle_section(u8g, x, y, x0, y0, option);
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while ( x < y )
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{
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if (f >= 0)
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{
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y--;
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ddF_y += 2;
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f += ddF_y;
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}
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x++;
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ddF_x += 2;
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f += ddF_x;
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u8g_draw_circle_section(u8g, x, y, x0, y0, option);
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}
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}
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void u8g_DrawCircle(u8g_t *u8g, u8g_uint_t x0, u8g_uint_t y0, u8g_uint_t rad, uint8_t option)
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{
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/* check for bounding box */
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{
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u8g_uint_t radp, radp2;
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radp = rad;
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radp++;
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radp2 = radp;
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radp2 *= 2;
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if ( u8g_IsBBXIntersection(u8g, x0-radp, y0-radp, radp2, radp2) == 0)
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return;
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}
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/* draw circle */
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u8g_draw_circle(u8g, x0, y0, rad, option);
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}
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static void u8g_draw_disc_section(u8g_t *u8g, u8g_uint_t x, u8g_uint_t y, u8g_uint_t x0, u8g_uint_t y0, uint8_t option) U8G_NOINLINE;
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static void u8g_draw_disc_section(u8g_t *u8g, u8g_uint_t x, u8g_uint_t y, u8g_uint_t x0, u8g_uint_t y0, uint8_t option)
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{
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/* upper right */
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if ( option & U8G_DRAW_UPPER_RIGHT )
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{
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u8g_DrawVLine(u8g, x0+x, y0-y, y+1);
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u8g_DrawVLine(u8g, x0+y, y0-x, x+1);
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}
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/* upper left */
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if ( option & U8G_DRAW_UPPER_LEFT )
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{
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u8g_DrawVLine(u8g, x0-x, y0-y, y+1);
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u8g_DrawVLine(u8g, x0-y, y0-x, x+1);
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}
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/* lower right */
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if ( option & U8G_DRAW_LOWER_RIGHT )
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{
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u8g_DrawVLine(u8g, x0+x, y0, y+1);
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u8g_DrawVLine(u8g, x0+y, y0, x+1);
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}
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/* lower left */
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if ( option & U8G_DRAW_LOWER_LEFT )
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{
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u8g_DrawVLine(u8g, x0-x, y0, y+1);
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u8g_DrawVLine(u8g, x0-y, y0, x+1);
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}
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}
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void u8g_draw_disc(u8g_t *u8g, u8g_uint_t x0, u8g_uint_t y0, u8g_uint_t rad, uint8_t option)
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{
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u8g_int_t f;
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u8g_int_t ddF_x;
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u8g_int_t ddF_y;
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u8g_uint_t x;
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u8g_uint_t y;
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f = 1;
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f -= rad;
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ddF_x = 1;
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ddF_y = 0;
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ddF_y -= rad;
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ddF_y *= 2;
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x = 0;
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y = rad;
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u8g_draw_disc_section(u8g, x, y, x0, y0, option);
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while ( x < y )
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{
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if (f >= 0)
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{
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y--;
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ddF_y += 2;
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f += ddF_y;
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}
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x++;
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ddF_x += 2;
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f += ddF_x;
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u8g_draw_disc_section(u8g, x, y, x0, y0, option);
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}
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}
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void u8g_DrawDisc(u8g_t *u8g, u8g_uint_t x0, u8g_uint_t y0, u8g_uint_t rad, uint8_t option)
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{
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/* check for bounding box */
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{
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u8g_uint_t radp, radp2;
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radp = rad;
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radp++;
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radp2 = radp;
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radp2 *= 2;
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if ( u8g_IsBBXIntersection(u8g, x0-radp, y0-radp, radp2, radp2) == 0)
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return;
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}
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/* draw disc */
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u8g_draw_disc(u8g, x0, y0, rad, option);
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}
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