aboutsummaryrefslogtreecommitdiff
path: root/arch/casiowin/monochromelib/src/filled_circle.c
blob: d29d0c58562fd30a834ae15da4351c7dafd7d853 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
/* ****************************************************************************
 * 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);
		}
	}
}