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circle.c
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circle.c
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/**
* tdpw - Two Dimensional Physics Workbench
* Copyright (C) Iain R. Learmonth 2012-2014.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <math.h>
#include "pnm.h"
#include "shape.h"
#include "circle.h"
#include "modulo.h"
int circleCollisionDetect( Shape s1, Shape s2 )
{
int d;
d = sqrt( pow((s1.x - s2.x),2) + pow((s1.y - s2.y),2) );
if ( d < s1.d )
return 1;
else
return 0;
}
void circle( Pic p, int x0, int y0, int d, int hue )
{
int x, y;
for ( y = y0 ; y < y0 + ( d ) ; y++ )
for ( x = x0 ; x < x0 + ( d ) ; x++ )
if ( incirc_( x - x0, y - y0, (d/2) ) == 0 )
p.data[modulo(x,p.width)][modulo(y,p.height)] = hue;
}