239 lines
8.5 KiB
C++
239 lines
8.5 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2011 Artem Pavlenko
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*****************************************************************************/
|
|
#ifndef MAPNIK_PYTHON_BINDING_GRID_UTILS_INCLUDED
|
|
#define MAPNIK_PYTHON_BINDING_GRID_UTILS_INCLUDED
|
|
|
|
// boost
|
|
#include <boost/python.hpp>
|
|
#include <boost/scoped_array.hpp>
|
|
#include <boost/foreach.hpp>
|
|
|
|
// mapnik
|
|
#include <mapnik/grid/grid_renderer.hpp>
|
|
#include <mapnik/grid/grid.hpp>
|
|
#include <mapnik/value_error.hpp>
|
|
#include "mapnik_value_converter.hpp"
|
|
|
|
namespace mapnik {
|
|
|
|
|
|
void grid2utf(mapnik::grid const& grid,
|
|
boost::python::list& l,
|
|
std::vector<mapnik::grid::lookup_type>& key_order)
|
|
{
|
|
mapnik::grid::data_type const& data = grid.data();
|
|
mapnik::grid::feature_key_type const& feature_keys = grid.get_feature_keys();
|
|
mapnik::grid::key_type keys;
|
|
mapnik::grid::key_type::const_iterator key_pos;
|
|
mapnik::grid::feature_key_type::const_iterator feature_pos;
|
|
uint16_t codepoint = 31;
|
|
|
|
for (unsigned y = 0; y < data.height(); ++y)
|
|
{
|
|
uint16_t idx = 0;
|
|
boost::scoped_array<Py_UNICODE> line(new Py_UNICODE[data.width()]);
|
|
mapnik::grid::value_type const* row = data.getRow(y);
|
|
for (unsigned x = 0; x < data.width(); ++x)
|
|
{
|
|
feature_pos = feature_keys.find(row[x]);
|
|
if (feature_pos != feature_keys.end())
|
|
{
|
|
mapnik::grid::lookup_type val = feature_pos->second;
|
|
key_pos = keys.find(val);
|
|
if (key_pos == keys.end())
|
|
{
|
|
// Create a new entry for this key. Skip the codepoints that
|
|
// can't be encoded directly in JSON.
|
|
++codepoint;
|
|
if (codepoint == 34) ++codepoint; // Skip "
|
|
else if (codepoint == 92) ++codepoint; // Skip backslash
|
|
|
|
keys[val] = codepoint;
|
|
key_order.push_back(val);
|
|
line[idx++] = static_cast<Py_UNICODE>(codepoint);
|
|
}
|
|
else
|
|
{
|
|
line[idx++] = static_cast<Py_UNICODE>(key_pos->second);
|
|
}
|
|
}
|
|
// else, shouldn't get here...
|
|
}
|
|
l.append(boost::python::object(
|
|
boost::python::handle<>(
|
|
PyUnicode_FromUnicode(line.get(), data.width()))));
|
|
}
|
|
}
|
|
|
|
|
|
void write_features(mapnik::grid::feature_type const& g_features,
|
|
boost::python::dict& feature_data,
|
|
std::vector<mapnik::grid::lookup_type> const& key_order,
|
|
std::string const& join_field,
|
|
std::set<std::string> const& attributes)
|
|
{
|
|
mapnik::grid::feature_type::const_iterator feat_itr = g_features.begin();
|
|
mapnik::grid::feature_type::const_iterator feat_end = g_features.end();
|
|
bool include_join_field = (attributes.find(join_field) != attributes.end());
|
|
for (; feat_itr != feat_end; ++feat_itr)
|
|
{
|
|
std::map<std::string,mapnik::value> const& props = feat_itr->second;
|
|
std::map<std::string,mapnik::value>::const_iterator const& itr = props.find(join_field);
|
|
if (itr != props.end())
|
|
{
|
|
mapnik::grid::lookup_type const& join_value = itr->second.to_string();
|
|
|
|
// only serialize features visible in the grid
|
|
if(std::find(key_order.begin(), key_order.end(), join_value) != key_order.end()) {
|
|
boost::python::dict feat;
|
|
std::map<std::string,mapnik::value>::const_iterator it = props.begin();
|
|
std::map<std::string,mapnik::value>::const_iterator end = props.end();
|
|
bool found = false;
|
|
for (; it != end; ++it)
|
|
{
|
|
std::string const& key = it->first;
|
|
if (key == join_field) {
|
|
// drop join_field unless requested
|
|
if (include_join_field) {
|
|
found = true;
|
|
feat[it->first] = boost::python::object(
|
|
boost::python::handle<>(
|
|
boost::apply_visitor(
|
|
boost::python::value_converter(),
|
|
it->second.base())));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
found = true;
|
|
feat[it->first] = boost::python::object(
|
|
boost::python::handle<>(
|
|
boost::apply_visitor(
|
|
boost::python::value_converter(),
|
|
it->second.base())));
|
|
}
|
|
}
|
|
if (found)
|
|
{
|
|
feature_data[feat_itr->first] = feat;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
std::clog << "should not get here: join_field '" << join_field << "' not found in grid feature properties\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
boost::python::dict render_grid(const mapnik::Map& map,
|
|
unsigned layer_idx, // layer
|
|
std::string const& join_field, // key_name
|
|
unsigned int step, // resolution
|
|
boost::python::list fields)
|
|
{
|
|
std::vector<mapnik::layer> const& layers = map.layers();
|
|
std::size_t layer_num = layers.size();
|
|
if (layer_idx >= layer_num) {
|
|
std::ostringstream s;
|
|
s << "Zero-based layer index '" << layer_idx << "' not valid, only '"
|
|
<< layer_num << "' layers are in map\n";
|
|
throw std::runtime_error(s.str());
|
|
}
|
|
|
|
unsigned int grid_width = map.width()/step;
|
|
unsigned int grid_height = map.height()/step;
|
|
|
|
mapnik::grid grid(grid_width,grid_height,join_field,step);
|
|
|
|
// convert python list to std::vector
|
|
boost::python::ssize_t num_fields = boost::python::len(fields);
|
|
for(boost::python::ssize_t i=0; i<num_fields; i++) {
|
|
boost::python::extract<std::string> name(fields[i]);
|
|
if (name.check()) {
|
|
grid.add_property_name(name());
|
|
}
|
|
else
|
|
{
|
|
std::stringstream s;
|
|
s << "list of field names must be strings";
|
|
throw mapnik::value_error(s.str());
|
|
}
|
|
}
|
|
|
|
// copy property names
|
|
std::set<std::string> attributes = grid.property_names();
|
|
|
|
if (join_field == grid.id_name_)
|
|
{
|
|
// TODO - should feature.id() be a first class attribute?
|
|
if (attributes.find(join_field) != attributes.end())
|
|
{
|
|
attributes.erase(join_field);
|
|
}
|
|
}
|
|
else if (attributes.find(join_field) == attributes.end())
|
|
{
|
|
attributes.insert(join_field);
|
|
}
|
|
|
|
try
|
|
{
|
|
mapnik::grid_renderer<mapnik::grid> ren(map,grid,1.0,0,0);
|
|
mapnik::layer const& layer = layers[layer_idx];
|
|
ren.apply(layer,attributes);
|
|
}
|
|
catch (...)
|
|
{
|
|
throw;
|
|
}
|
|
|
|
// convert buffer to utf and gather key order
|
|
boost::python::list l;
|
|
std::vector<mapnik::grid::lookup_type> key_order;
|
|
mapnik::grid2utf(grid,l,key_order);
|
|
|
|
// convert key order to proper python list
|
|
boost::python::list keys_a;
|
|
BOOST_FOREACH ( mapnik::grid::lookup_type const& key_id, key_order )
|
|
{
|
|
keys_a.append(key_id);
|
|
}
|
|
|
|
// gather feature data
|
|
boost::python::dict feature_data;
|
|
if (num_fields > 0) {
|
|
mapnik::grid::feature_type const& g_features = grid.get_grid_features();
|
|
mapnik::write_features(g_features,feature_data,key_order,join_field,grid.property_names());
|
|
}
|
|
|
|
// build dictionary and return to python
|
|
boost::python::dict json;
|
|
json["grid"] = l;
|
|
json["keys"] = keys_a;
|
|
json["data"] = feature_data;
|
|
return json;
|
|
}
|
|
|
|
}
|
|
|
|
#endif // MAPNIK_PYTHON_BINDING_GRID_UTILS_INCLUDED
|