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/* ****************************************************************************
* filled_circle.c -- Draw a filled circle.
* Copyright (C) 2011 Pierre Le Gall <legallpierre89@gmail.com>
* Copyright (C) 2016-2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
*
* This file is part of the 'casiowin/monochromelib' module in libcarrot, an
* experimental modular libc project.
*
* This file is governed by the CeCILL-C license under French law and abiding
* by the rules of distribution of free software. You can use, modify and or
* redistribute it under the terms of the CeCILL-C license as circulated by
* CEA, CNRS and INRIA at the following URL: http://www.cecill.info
*
* As a counterpart to the access to the source code and rights to copy, modify
* and redistribute granted by the license, users are provided only with a
* limited warranty and the software's author, the holder of the economic
* rights, and the successive licensors have only limited liability.
*
* In this respect, the user's attention is drawn to the risks associated with
* loading, using, modifying and/or developing and reproducing the software by
* the user in light of its specific status of free software, that may mean
* that it is complicated to manipulate, and that also therefore means that it
* is reserved for developers and experienced professionals having in-depth
* computer knowledge. Users are therefore encouraged to load and test the
* software's suitability as regards their requirements in conditions enabling
* the security of their systems and/or data to be ensured and, more generally,
* to use and operate it in the same conditions as regards security.
*
* The fact that you are presently reading this means you have had knowledge of
* the CeCILL-C license and that you accept its terms.
* ************************************************************************* */
#include <monochrome.h>
void ML_filled_circle(int x, int y, int radius, ML_Color color)
{
int plot_x, plot_y, d;
if(radius < 0) return;
plot_x = 0;
plot_y = radius;
d = 1 - radius;
ML_horizontal_line(y, x-plot_y, x+plot_y, color);
while(plot_y > plot_x)
{
if(d < 0)
d += 2*plot_x+3;
else {
d += 2*(plot_x-plot_y)+5;
plot_y--;
ML_horizontal_line(y+plot_y+1, x-plot_x, x+plot_x, color);
ML_horizontal_line(y-plot_y-1, x-plot_x, x+plot_x, color);
}
plot_x++;
if(plot_y >= plot_x)
{
ML_horizontal_line(y+plot_x, x-plot_y, x+plot_y, color);
ML_horizontal_line(y-plot_x, x-plot_y, x+plot_y, color);
}
}
}
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