Пример #1
0
func (m *Map) RenderToMemoryUTFGrid(lname string, key string, res uint) (string, error) {
	l := &Layer{}
	n := int(C.mapnik_map_layer_count(m.m))
	for i := 0; i < n; i++ {
		ml := C.mapnik_map_get_layer(m.m, C.size_t(i))
		defer C.free(unsafe.Pointer(ml))
		if C.GoString(C.mapnik_layer_name(ml)) == lname {
			l.l = ml
			break
		}
	}
	if l.l == nil {
		return "", fmt.Errorf("no such layer %s", lname)
	}

	cs := C.CString(key)
	defer C.free(unsafe.Pointer(cs))
	g := C.mapnik_map_render_to_grid(m.m, l.l, cs)
	if g == nil {
		return "", m.lastError()
	}
	defer C.mapnik_grid_free(g)
	json := C.mapnik_grid_to_json(g, C.uint(res))
	if json == nil {
		return "", m.lastError()
	}
	defer C.free(unsafe.Pointer(json))
	return C.GoString(json), nil
}
Пример #2
0
func (m *Map) printLayerStatus() {
	n := C.mapnik_map_layer_count(m.m)
	for i := 0; i < int(n); i++ {
		fmt.Println(
			C.GoString(C.mapnik_map_layer_name(m.m, C.size_t(i))),
			C.mapnik_map_layer_is_active(m.m, C.size_t(i)),
		)
	}
}
Пример #3
0
func (m *Map) currentLayerStatus() []bool {
	n := C.mapnik_map_layer_count(m.m)
	active := make([]bool, n)
	for i := 0; i < int(n); i++ {
		if C.mapnik_map_layer_is_active(m.m, C.size_t(i)) == 1 {
			active[i] = true
		}
	}
	return active
}
Пример #4
0
func (m *Map) SetActiveLayer(lname string) {
	n := int(C.mapnik_map_layer_count(m.m))
	for i := 0; i < n; i++ {
		l := C.mapnik_map_get_layer(m.m, C.size_t(i))
		defer C.free(unsafe.Pointer(l))
		if C.GoString(C.mapnik_layer_name(l)) == lname {
			C.mapnik_layer_set_active(l, 1)
		} else {
			C.mapnik_layer_set_active(l, 0)
		}
	}
}
Пример #5
0
// SelectLayers enables/disables single layers. LayerSelector or SelectorFunc gets called for each layer.
func (m *Map) SelectLayers(selector LayerSelector) {
	m.storeLayerStatus()
	n := C.mapnik_map_layer_count(m.m)
	for i := 0; i < int(n); i++ {
		layerName := C.GoString(C.mapnik_map_layer_name(m.m, C.size_t(i)))
		switch selector.Select(layerName) {
		case Include:
			C.mapnik_map_layer_set_active(m.m, C.size_t(i), 1)
		case Exclude:
			C.mapnik_map_layer_set_active(m.m, C.size_t(i), 0)
		case Default:
		}
	}
}
Пример #6
0
func (m *Map) resetLayerStatus() {
	if len(m.layerStatus) == 0 {
		return // not stored
	}
	n := C.mapnik_map_layer_count(m.m)
	if int(n) > len(m.layerStatus) {
		// should not happen
		return
	}
	for i := 0; i < int(n); i++ {
		if m.layerStatus[i] {
			C.mapnik_map_layer_set_active(m.m, C.size_t(i), 1)
		} else {
			C.mapnik_map_layer_set_active(m.m, C.size_t(i), 0)
		}
	}
	m.layerStatus = nil
}