pointInPolygon()

Function pointInPolygon() judges whether a 2D coordinate locates in (not outside or on ) the boundary of a polygon, and returns 1 for true, 0 for false.

Arguments：

• 2D coordinates <point|list>
• Polygon <list>

Returns：

• Result <number>

Common Usage

Exalmple: Direct calculate

UQL
uncollect [[1.5,0.5],[2,2]] as point
uncollect [[[1,0],[3,0],[3,1],[1,1]],[[1,0],[2,1],[1,2],[0,1]]] as polygon
return table(toString(point), toString(polygon), pointInPolygon(point, polygon))

Result
| toString(point) |     toString(polygon)     | pointInPolygon(point, polygon) |
|-----------------|---------------------------|--------------------------------|
| [1.5,0.5]       | [[1,0],[3,0],[3,1],[1,1]] | 1                              |
| [2,2]           | [[1,0],[2,1],[1,2],[0,1]] | 0                              |

Exalmple: Multiply and calculate

UQL
uncollect [[1.5,0.5],[2,2]] as point
uncollect [[[1,0],[3,0],[3,1],[1,1]],[[1,0],[2,1],[1,2],[0,1]]] as polygon
with pointInPolygon(point, polygon) as result
return table(toString(point), toString(polygon), result)

Result
| toString(point) |     toString(polygon)     | result |
|-----------------|---------------------------|--------|
| [1.5,0.5]       | [[1,0],[3,0],[3,1],[1,1]] | 1      |
| [1.5,0.5]       | [[1,0],[2,1],[1,2],[0,1]] | 0      |
| [2,2]           | [[1,0],[3,0],[3,1],[1,1]] | 0      |
| [2,2]           | [[1,0],[2,1],[1,2],[0,1]] | 0      |