qgis_hal.py 文件源码

def create_memory_layer(geometry_type, crs, name, custom_properties=None):
    assert geometry_type in (QGis.Point, QGis.Line, QGis.Polygon)
    layer = QgsVectorLayer(
        "{}?crs={}&index=yes".format(
            {
                QGis.Point: "Point",
                QGis.Line: "LineString",
                QGis.Polygon: "Polygon"
            }[geometry_type],
            crs.authid()
            ), name, "memory")
    layer.setCrs(crs)
    if custom_properties:
        for key in custom_properties:
            layer.setCustomProperty(key, custom_properties[key])
    return layer