bool validate() const
{
mapnik::request m_req(width_,height_,extent_);
mapnik::image_32 im(m_->width(),m_->height());
mapnik::attributes variables;
m_req.set_buffer_size(m_->buffer_size());
mapnik::projection map_proj(m_->srs(),true);
double scale_denom = mapnik::scale_denominator(m_req.scale(),map_proj.is_geographic());
scale_denom *= scale_factor_;
mapnik::agg_renderer<mapnik::image_32> ren(*m_,m_req,variables,im,scale_factor_);
ren.start_map_processing(*m_);
std::vector<mapnik::layer> const& layers = m_->layers();
process_layers(ren,m_req,map_proj,layers,scale_denom);
ren.end_map_processing(*m_);
if (!preview_.empty()) {
std::clog << "preview available at " << preview_ << "\n";
mapnik::save_to_file(im,preview_);
}
return true;
}
void operator()() const
{
if (preview_.empty()) {
for (unsigned i=0;i<iterations_;++i)
{
mapnik::request m_req(width_,height_,extent_);
mapnik::image_32 im(m_->width(),m_->height());
mapnik::attributes variables;
m_req.set_buffer_size(m_->buffer_size());
mapnik::projection map_proj(m_->srs(),true);
double scale_denom = mapnik::scale_denominator(m_req.scale(),map_proj.is_geographic());
scale_denom *= scale_factor_;
mapnik::agg_renderer<mapnik::image_32> ren(*m_,m_req,variables,im,scale_factor_);
ren.start_map_processing(*m_);
std::vector<mapnik::layer> const& layers = m_->layers();
process_layers(ren,m_req,map_proj,layers,scale_denom);
ren.end_map_processing(*m_);
}
}
}
double Map::scale_denominator() const
{
projection map_proj(srs_);
return mapnik::scale_denominator( scale(), map_proj.is_geographic());
}
