示例#1
0
文件: ops.go 项目: Rachine/imposm3
// 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
}
示例#2
0
func cGEOSLineMerge(g *C.GEOSGeometry) *C.GEOSGeometry {
	handlemu.Lock()
	defer handlemu.Unlock()
	return C.GEOSLineMerge_r(handle, g)
}