public static bool Contains(int[] xPoints, int[] yPoints,
int nPoints,RectBox bounds, int x1, int y1)
{
if ((bounds != null && bounds.Inside(x1, y1))
|| (bounds == null && GetBoundingBox(xPoints, yPoints, nPoints)
.Inside(x1, y1)))
{
int hits = 0;
int ySave = 0;
int i = 0;
while (i < nPoints && yPoints[i] == y1)
{
i++;
}
for (int n = 0; n < nPoints; n++)
{
int j = (i + 1) % nPoints;
int dx = xPoints[j] - xPoints[i];
int dy = yPoints[j] - yPoints[i];
if (dy != 0)
{
int rx = x1 - xPoints[i];
int ry = y1 - yPoints[i];
if (yPoints[j] == y1 && xPoints[j] >= x1)
{
ySave = yPoints[i];
}
if (yPoints[i] == y1 && xPoints[i] >= x1)
{
if ((ySave > y1) != (yPoints[j] > y1))
{
hits--;
}
}
if (ry * dy >= 0
&& (ry <= dy && ry >= 0 || ry >= dy && ry <= 0)
&& Round(dx * ry, dy) >= rx)
{
hits++;
}
}
i = j;
}
return (hits % 2) != 0;
}
return false;
}