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js_grid_utils.hpp
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js_grid_utils.hpp
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#ifndef __NODE_MAPNIK_GRID_UTILS_H__
#define __NODE_MAPNIK_GRID_UTILS_H__
// v8
#include <v8.h>
// mapnik
#include <mapnik/grid/grid.hpp>
#include "utils.hpp"
using namespace v8;
using namespace node;
namespace node_mapnik {
template <typename T>
static void grid2utf(T const& grid_type,
Local<Array>& l,
std::vector<typename T::lookup_type>& key_order)
{
typename T::data_type const& data = grid_type.data();
typename T::feature_key_type const& feature_keys = grid_type.get_feature_keys();
typename T::key_type keys;
typename T::key_type::const_iterator key_pos;
typename T::feature_key_type::const_iterator feature_pos;
// start counting at utf8 codepoint 32, aka space character
uint16_t codepoint = 32;
uint16_t row_idx = 0;
unsigned array_size = data.width();
for (unsigned y = 0; y < data.height(); ++y)
{
uint16_t idx = 0;
boost::scoped_array<uint16_t> line(new uint16_t[array_size]);
typename T::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())
{
typename T::lookup_type const& 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.
if (codepoint == 34) ++codepoint; // Skip "
else if (codepoint == 92) ++codepoint; // Skip backslash
keys[val] = codepoint;
key_order.push_back(val);
line[idx++] = static_cast<uint16_t>(codepoint);
++codepoint;
}
else
{
line[idx++] = static_cast<uint16_t>(key_pos->second);
}
}
// else, shouldn't get here...
}
l->Set(row_idx, String::New(line.get(),array_size));
++row_idx;
}
}
// requires mapnik >= r2957
template <typename T>
static void grid2utf(T const& grid_type,
Local<Array>& l,
std::vector<typename T::lookup_type>& key_order,
unsigned int resolution)
{
typename T::feature_key_type const& feature_keys = grid_type.get_feature_keys();
typename T::key_type keys;
typename T::key_type::const_iterator key_pos;
typename T::feature_key_type::const_iterator feature_pos;
// start counting at utf8 codepoint 32, aka space character
uint16_t codepoint = 32;
uint16_t row_idx = 0;
unsigned array_size = static_cast<unsigned int>(grid_type.width()/resolution);
for (unsigned y = 0; y < grid_type.height(); y=y+resolution)
{
uint16_t idx = 0;
boost::scoped_array<uint16_t> line(new uint16_t[array_size]);
typename T::value_type const* row = grid_type.getRow(y);
for (unsigned x = 0; x < grid_type.width(); x=x+resolution)
{
// todo - this lookup is expensive
feature_pos = feature_keys.find(row[x]);
if (feature_pos != feature_keys.end())
{
typename T::lookup_type const& 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.
if (codepoint == 34) ++codepoint; // Skip "
else if (codepoint == 92) ++codepoint; // Skip backslash
keys[val] = codepoint;
key_order.push_back(val);
line[idx++] = static_cast<uint16_t>(codepoint);
++codepoint;
}
else
{
line[idx++] = static_cast<uint16_t>(key_pos->second);
}
}
// else, shouldn't get here...
}
l->Set(row_idx, String::New(line.get(),array_size));
++row_idx;
}
}
template <typename T>
static void write_features(T const& grid_type,
Local<Object>& feature_data,
std::vector<typename T::lookup_type> const& key_order)
{
std::string const& key = grid_type.get_key();
std::set<std::string> const& attributes = grid_type.property_names();
typename T::feature_type const& g_features = grid_type.get_grid_features();
typename T::feature_type::const_iterator feat_itr = g_features.begin();
typename T::feature_type::const_iterator feat_end = g_features.end();
bool include_key = (attributes.find(key) != attributes.end());
for (; feat_itr != feat_end; ++feat_itr)
{
mapnik::feature_ptr feature = feat_itr->second;
boost::optional<std::string> join_value;
if (key == grid_type.key_name())
{
std::stringstream s;
s << feature->id();
join_value = s.str();
}
else if (feature->has_key(key))
{
join_value = feature->get(key).to_string();
}
if (join_value)
{
// only serialize features visible in the grid
if(std::find(key_order.begin(), key_order.end(), *join_value) != key_order.end()) {
Local<Object> feat = Object::New();
bool found = false;
if (key == grid_type.key_name())
{
// drop key unless requested
if (include_key) {
found = true;
// TODO do we need to duplicate __id__ ?
//feat->Set(String::NewSymbol(key.c_str()), String::New(join_value->c_str()) );
}
}
mapnik::feature_impl::iterator itr = feature->begin();
mapnik::feature_impl::iterator end = feature->end();
for ( ;itr!=end; ++itr)
{
std::string const& key_name = boost::get<0>(*itr);
if (key_name == key) {
// drop key unless requested
if (include_key) {
found = true;
params_to_object serializer( feat , key_name);
boost::apply_visitor( serializer, boost::get<1>(*itr).base() );
}
}
else if ( (attributes.find(key_name) != attributes.end()) )
{
found = true;
params_to_object serializer( feat , key_name);
boost::apply_visitor( serializer, boost::get<1>(*itr).base() );
}
}
if (found)
{
feature_data->Set(String::NewSymbol(feat_itr->first.c_str()), feat);
}
}
}
else
{
std::clog << "should not get here: key '" << key << "' not found in grid feature properties\n";
}
}
}
}
#endif // __NODE_MAPNIK_GRID_UTILS_H__