This flag enumeration specifies point hittest results for a selected mark.
Values:
| IG_ARTX_HITTEST_NONE | The point is outside of any mark. |
| IG_ARTX_HITTEST_ONMARK | The point is exactly on mark pixels. |
| IG_ARTX_HITTEST_ONBOUND | The point is exactly on mark bounding rectangle. |
| IG_ARTX_HITTEST_ONPOINT | The point is exactly on mark corner-point. |
| IG_ARTX_HITTEST_INBOUND | The point is within mark bounds, but not on mark pixels. |
| IG_ARTX_HITTEST_ON |
The point is either:
|