Added in 1.9.0
$inpoly(x,y,a1,a2,b1,b2,...)
Returns $true if the point x y is inside the polygon defined by the specified points, otherwise $false.
Parameters
| Parameter | Description |
| x | The X coordinate. |
| y | The Y coordinate. |
| a1 | The first point x. |
| a2 | The first point y. |
| b1 | The second point x. |
| b2 | The second point y. |
| ... | Additional points. |