#include "StdAfx.h"

int IsPointInPoly(int nvert, float *vertx, float *verty, float testx, float testy)
{
	int i, j, c = 0;
	for (i = 0, j = nvert-1; i < nvert; j = i++) 
	{
		if ( ( ( verty[i] > testy) != (verty[j] > testy)) &&
			(testx < (vertx[j] - vertx[i]) * (testy - verty[i]) / (verty[j] - verty[i]) + vertx[i]) )
			c = !c;
	}
	return c;
}