Inflates or deflates polyline by delta units (pixels), producing polygons. If delta is positive, makes the polyline grow outward. Returns an array of polygons because inflating/deflating may result in multiple discrete polygons. If delta is negative, returns an empty array.
Each polygon's vertices will be rounded as determined by join_type, see polyjointype.
Each polygon's endpoints will be rounded as determined by end_type, see polyendtype.
The operation may result in an outer polygon (boundary) and inner polygon (hole) produced which could be distinguished by calling isPolygonClockwise.
Inflates or deflates polyline by delta units (pixels), producing polygons. If delta is positive, makes the polyline grow outward. Returns an array of polygons because inflating/deflating may result in multiple discrete polygons. If delta is negative, returns an empty array. Each polygon's vertices will be rounded as determined by join_type, see polyjointype. Each polygon's endpoints will be rounded as determined by end_type, see polyendtype. The operation may result in an outer polygon (boundary) and inner polygon (hole) produced which could be distinguished by calling isPolygonClockwise.