func (this *Geos) Polygon(exterior *Geom, interiors []*Geom) *Geom {
if len(interiors) == 0 {
geom := C.GEOSGeom_createPolygon_r(this.v, exterior.v, nil, C.uint(0))
if geom == nil {
return nil
}
err := C.GEOSNormalize_r(this.v, geom)
if err != 0 {
C.GEOSGeom_destroy(geom)
return nil
}
return &Geom{geom}
}
interiorPtr := make([]*C.GEOSGeometry, len(interiors))
for i, geom := range interiors {
interiorPtr[i] = geom.v
}
geom := C.GEOSGeom_createPolygon_r(this.v, exterior.v, &interiorPtr[0], C.uint(len(interiors)))
if geom == nil {
return nil
}
err := C.GEOSNormalize_r(this.v, geom)
if err != 0 {
C.GEOSGeom_destroy(geom)
return nil
}
return &Geom{geom}
}
func (this *Geos) CreatePolygon(shell *Geom, holes []*Geom) *Geom {
if len(holes) > 0 {
panic("holes not implemented")
}
polygon := C.GEOSGeom_createPolygon_r(this.v, shell.v, nil, 0)
if polygon == nil {
return nil
}
return &Geom{polygon}
}
func cGEOSGeom_createPolygon(shell *C.GEOSGeometry, holes **C.GEOSGeometry, nholes C.uint) *C.GEOSGeometry {
handlemu.Lock()
defer handlemu.Unlock()
return C.GEOSGeom_createPolygon_r(handle, shell, holes, nholes)
}