This function tests to see if the specified point (x, y) is within the specified region.
| Type | Name | Description |
|---|---|---|
| GR_REGION_ID | region | The ID of the region to test for inclusion of the point. |
| GR_COORD | x | The X coordinate of the point to test. |
| GR_COORD | y | The Y coordinate of the point to test. |