C++ (Cpp) Map::query_point示例

示例#1

文件： mapnik_map.cpp 项目： mapnik/python-mapnik

// TODO - we likely should allow indexing by negative number from python
// for now, protect against negative values and kindly throw
mapnik::featureset_ptr query_point(mapnik::Map const& m, int index, double x, double y)
{
    if (index < 0){
        PyErr_SetString(PyExc_IndexError, "Please provide a layer index >= 0");
        boost::python::throw_error_already_set();
    }
    unsigned idx = index;
    return m.query_point(idx, x, y);
}