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/* cassbeam - a Cassegrain antenna simulator
Copyright (C) August 18, 2003 Walter Brisken
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA*/
#ifndef __POLYGON_H__
#define __POLYGON_H__
#include "vector.h"
/* returns 1 if x0, y0 is inside C(x, y),
* 0 if x0, y0 is on C(x, y),
* -1 if x0, y0 is outside C(x, y).
*/
int polygonside(const Vector x, const Vector y, double x0, double y0);
double polygonperimeter(const Vector x, const Vector y);
/* positive for counter clockwise polygon */
double polygonarea(const Vector x, const Vector y);
#endif
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