The PtInRegion function determines whether the specified point is inside the specified region.
BOOL PtInRegion(
HRGN hrgn, |
// handle of region |
int X, |
// x-coordinate of point |
int Y |
// y-coordinate of point |
); |
If the specified point is in the region, the return value is nonzero.
If the specified point is not in the region, the return value is zero.