Function checkPolygon

JMap.Geometry.checkPolygon

Throw an error if the provided parameter is not a valid polygon.

Example

let polygon = [[ 10, 10 ], [ 11, 11 ], [ 12, 12 ], [ 10, 10 ]]
// The following instruction will not throw an error
JMap.Geometry.checkPolygon(polygon)

polygon = [] // empty array
// The following instruction will throw an error
JMap.Geometry.checkPolygon(polygon)
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