Method initLoopProperties

s2/polygon.go:389–405

initLoopProperties sets the properties for polygons with multiple loops.

()

// initLoopProperties sets the properties for polygons with multiple loops.
func (p *Polygon) initLoopProperties() {
	p.numVertices = 0
	// the loops depths are set by initNested/initOriented prior to this.
	p.bound = EmptyRect()
	p.hasHoles = false
	for _, l := range p.loops {
		if l.IsHole() {
			p.hasHoles = true
		} else {
			p.bound = p.bound.Union(l.RectBound())
		}
		p.numVertices += l.NumVertices()
	}
	p.subregionBound = ExpandForSubregions(p.bound)

	p.initEdgesAndIndex()
}

// initEdgesAndIndex performs the shape related initializations and adds the final
// polygon to the index.