// LineMerge tries to merge lines. Returns slice of LineStrings.
// Destroys lines and returns new allocated LineString Geoms.
func (this *Geos) LineMerge(lines []*Geom) []*Geom {
if len(lines) <= 1 {
return lines
}
multiLineString := this.MultiLineString(lines)
if multiLineString == nil {
return nil
}
defer this.Destroy(multiLineString)
merged := C.GEOSLineMerge_r(this.v, multiLineString.v)
if merged == nil {
return nil
}
geom := &Geom{merged}
if this.Type(geom) == "LineString" {
return []*Geom{geom}
}
// extract MultiLineString
lines = make([]*Geom, 0, this.NumGeoms(geom))
for _, line := range this.Geoms(geom) {
lines = append(lines, this.Clone(line))
}
this.Destroy(geom)
return lines
}
func cGEOSLineMerge(g *C.GEOSGeometry) *C.GEOSGeometry {
handlemu.Lock()
defer handlemu.Unlock()
return C.GEOSLineMerge_r(handle, g)
}