55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/* ************************************************************************** */
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/* */
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/* ML_circle.c */
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/* | Project : monochromelib */
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/* */
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/* By: Pierre "PierrotLL" Le Gall <legallpierre89@gmail.com> */
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/* Last updated: 2011/11/22 */
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/* */
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/* ************************************************************************** */
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#include <monochrome/internals.h>
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void ML_circle(int x, int y, int radius, ML_Color color)
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{
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int plot_x, plot_y, d;
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if(radius < 0) return;
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plot_x = 0;
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plot_y = radius;
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d = 1 - radius;
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ML_pixel(x, y+plot_y, color);
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if(radius)
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{
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ML_pixel(x, y-plot_y, color);
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ML_pixel(x+plot_y, y, color);
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ML_pixel(x-plot_y, y, color);
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}
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while(plot_y > plot_x)
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{
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if(d < 0)
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d += 2*plot_x+3;
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else
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{
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d += 2*(plot_x-plot_y)+5;
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plot_y--;
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}
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plot_x++;
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if(plot_y >= plot_x)
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{
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ML_pixel(x+plot_x, y+plot_y, color);
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ML_pixel(x-plot_x, y+plot_y, color);
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ML_pixel(x+plot_x, y-plot_y, color);
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ML_pixel(x-plot_x, y-plot_y, color);
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}
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if(plot_y > plot_x)
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{
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ML_pixel(x+plot_y, y+plot_x, color);
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ML_pixel(x-plot_y, y+plot_x, color);
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ML_pixel(x+plot_y, y-plot_x, color);
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ML_pixel(x-plot_y, y-plot_x, color);
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}
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}
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}
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