void render(mapnik::geometry_type & geom,
mapnik::box2d<double> const& extent,
std::string const& name)
{
using path_type = mapnik::coord_transform<mapnik::CoordTransform,mapnik::geometry_type>;
using ren_base = agg::renderer_base<agg::pixfmt_rgba32_plain>;
using renderer = agg::renderer_scanline_aa_solid<ren_base>;
mapnik::image_32 im(256,256);
im.set_background(mapnik::color("white"));
mapnik::box2d<double> padded_extent = extent;
padded_extent.pad(10);
mapnik::CoordTransform tr(im.width(),im.height(),padded_extent,0,0);
agg::rendering_buffer buf(im.raw_data(),im.width(),im.height(), im.width() * 4);
agg::pixfmt_rgba32_plain pixf(buf);
ren_base renb(pixf);
renderer ren(renb);
ren.color(agg::rgba8(127,127,127,255));
agg::rasterizer_scanline_aa<> ras;
mapnik::proj_transform prj_trans(mapnik::projection("+init=epsg:4326"),mapnik::projection("+init=epsg:4326"));
geom.rewind(0);
path_type path(tr,geom,prj_trans);
ras.add_path(path);
agg::scanline_u8 sl;
agg::render_scanlines(ras, sl, ren);
mapnik::save_to_file(im,name);
geom.rewind(0);
}
void render(mapnik::geometry_type const& geom,
mapnik::box2d<double> const& extent,
std::string const& name)
{
using path_type = mapnik::transform_path_adapter<mapnik::view_transform,mapnik::vertex_adapter>;
using ren_base = agg::renderer_base<agg::pixfmt_rgba32_plain>;
using renderer = agg::renderer_scanline_aa_solid<ren_base>;
mapnik::vertex_adapter va(geom);
mapnik::image_rgba8 im(256,256);
mapnik::fill(im, mapnik::color("white"));
mapnik::box2d<double> padded_extent = extent;
padded_extent.pad(10);
mapnik::view_transform tr(im.width(),im.height(),padded_extent,0,0);
agg::rendering_buffer buf(im.getBytes(),im.width(),im.height(), im.getRowSize());
agg::pixfmt_rgba32_plain pixf(buf);
ren_base renb(pixf);
renderer ren(renb);
ren.color(agg::rgba8(127,127,127,255));
agg::rasterizer_scanline_aa<> ras;
mapnik::proj_transform prj_trans(mapnik::projection("+init=epsg:4326"),mapnik::projection("+init=epsg:4326"));
path_type path(tr,va,prj_trans);
ras.add_path(path);
agg::scanline_u8 sl;
agg::render_scanlines(ras, sl, ren);
mapnik::save_to_file(im,name);
}
featureset_ptr Map::query_point(unsigned index, double x, double y) const
{
if (!current_extent_.valid())
{
throw std::runtime_error("query_point: map extent is not intialized, you need to set a valid extent before querying");
}
if (!current_extent_.intersects(x,y))
{
throw std::runtime_error("query_point: x,y coords do not intersect map extent");
}
if (index < layers_.size())
{
mapnik::layer const& layer = layers_[index];
mapnik::datasource_ptr ds = layer.datasource();
if (ds)
{
mapnik::projection dest(srs_);
mapnik::projection source(layer.srs());
proj_transform prj_trans(source,dest);
double z = 0;
if (!prj_trans.equal() && !prj_trans.backward(x,y,z))
{
throw std::runtime_error("query_point: could not project x,y into layer srs");
}
// calculate default tolerance
mapnik::box2d<double> map_ex = current_extent_;
if (maximum_extent_)
{
map_ex.clip(*maximum_extent_);
}
if (!prj_trans.backward(map_ex,PROJ_ENVELOPE_POINTS))
{
std::ostringstream s;
s << "query_point: could not project map extent '" << map_ex
<< "' into layer srs for tolerance calculation";
throw std::runtime_error(s.str());
}
double tol = (map_ex.maxx() - map_ex.minx()) / width_ * 3;
featureset_ptr fs = ds->features_at_point(mapnik::coord2d(x,y), tol);
MAPNIK_LOG_DEBUG(map) << "map: Query at point tol=" << tol << "(" << x << "," << y << ")";
if (fs)
{
return boost::make_shared<filter_featureset<hit_test_filter> >(fs,
hit_test_filter(x,y,tol));
}
}
}
else
{
std::ostringstream s;
s << "Invalid layer index passed to query_point: '" << index << "'";
if (!layers_.empty()) s << " for map with " << layers_.size() << " layers(s)";
else s << " (map has no layers)";
throw std::out_of_range(s.str());
}
return featureset_ptr();
}
int main() {
mapnik::projection merc("+init=epsg:3857",true);
mapnik::proj_transform prj_trans(merc,merc); // no-op
unsigned tile_size = 256;
mapnik::vector_tile_impl::spherical_mercator merc_tiler(tile_size);
double minx,miny,maxx,maxy;
merc_tiler.xyz(9664,20435,15,minx,miny,maxx,maxy);
mapnik::box2d<double> z15_extent(minx,miny,maxx,maxy);
mapnik::view_transform tr(tile_size,tile_size,z15_extent,0,0);
std::string geojson_file("./test/data/poly.geojson");
mapnik::util::file input(geojson_file);
if (!input.open())
{
throw std::runtime_error("failed to open geojson");
}
mapnik::geometry::geometry<double> geom;
std::string json_string(input.data().get(), input.size());
if (!mapnik::json::from_geojson(json_string, geom))
{
throw std::runtime_error("failed to parse geojson");
}
mapnik::geometry::correct(geom);
unsigned count = 0;
unsigned count2 = 0;
{
mapnik::vector_tile_impl::vector_tile_strategy vs(prj_trans, tr, 16);
mapnik::progress_timer __stats__(std::clog, "boost::geometry::transform");
for (unsigned i=0;i<10000;++i)
{
mapnik::geometry::geometry<std::int64_t> new_geom = mapnik::geometry::transform<std::int64_t>(geom, vs);
auto const& poly = mapnik::util::get<mapnik::geometry::multi_polygon<std::int64_t>>(new_geom);
count += poly.size();
}
}
{
mapnik::vector_tile_impl::vector_tile_strategy vs(prj_trans, tr, 16);
mapnik::progress_timer __stats__(std::clog, "transform_visitor with reserve");
mapnik::vector_tile_impl::transform_visitor transit(vs);
for (unsigned i=0;i<10000;++i)
{
mapnik::geometry::geometry<std::int64_t> new_geom = mapnik::util::apply_visitor(transit,geom);
auto const& poly = mapnik::util::get<mapnik::geometry::multi_polygon<std::int64_t>>(new_geom);
count2 += poly.size();
}
if (count != count2)
{
std::clog << "tests did not run as expected!\n";
return -1;
}
}
return 0;
}
featureset_ptr Map::query_map_point(unsigned index, double x, double y) const
{
if ( index< layers_.size())
{
mapnik::layer const& layer = layers_[index];
CoordTransform tr = view_transform();
tr.backward(&x,&y);
try
{
mapnik::projection dest(srs_);
mapnik::projection source(layer.srs());
proj_transform prj_trans(source,dest);
double z = 0;
prj_trans.backward(x,y,z);
double minx = current_extent_.minx();
double miny = current_extent_.miny();
double maxx = current_extent_.maxx();
double maxy = current_extent_.maxy();
prj_trans.backward(minx,miny,z);
prj_trans.backward(maxx,maxy,z);
double tol = (maxx - minx) / width_ * 3;
mapnik::datasource_ptr ds = layer.datasource();
if (ds)
{
#ifdef MAPNIK_DEBUG
std::clog << " query at point tol = " << tol << " (" << x << "," << y << ")\n";
#endif
featureset_ptr fs = ds->features_at_point(mapnik::coord2d(x,y));
if (fs)
return boost::make_shared<filter_featureset<hit_test_filter> >(fs,
hit_test_filter(x,y,tol));
}
}
catch (...)
{
#ifdef MAPNIK_DEBUG
std::clog << "exception caught in \"query_map_point\"\n";
#endif
}
}
return featureset_ptr();
}
void Map::zoom_all()
{
try
{
if (layers_.empty())
{
return;
}
projection proj0(srs_);
box2d<double> ext;
bool success = false;
bool first = true;
std::vector<layer>::const_iterator itr = layers_.begin();
std::vector<layer>::const_iterator end = layers_.end();
while (itr != end)
{
if (itr->active())
{
std::string const& layer_srs = itr->srs();
projection proj1(layer_srs);
proj_transform prj_trans(proj0,proj1);
box2d<double> layer_ext = itr->envelope();
if (prj_trans.backward(layer_ext, PROJ_ENVELOPE_POINTS))
{
success = true;
MAPNIK_LOG_DEBUG(map) << "map: Layer " << itr->name() << " original ext=" << itr->envelope();
MAPNIK_LOG_DEBUG(map) << "map: Layer " << itr->name() << " transformed to map srs=" << layer_ext;
if (first)
{
ext = layer_ext;
first = false;
}
else
{
ext.expand_to_include(layer_ext);
}
}
}
++itr;
}
if (success)
{
if (maximum_extent_) {
ext.clip(*maximum_extent_);
}
zoom_to_box(ext);
}
else
{
if (maximum_extent_)
{
MAPNIK_LOG_ERROR(map) << "could not zoom to combined layer extents"
<< " so falling back to maximum-extent for zoom_all result";
zoom_to_box(*maximum_extent_);
}
else
{
std::ostringstream s;
s << "could not zoom to combined layer extents "
<< "using zoom_all because proj4 could not "
<< "back project any layer extents into the map srs "
<< "(set map 'maximum-extent' to override layer extents)";
throw std::runtime_error(s.str());
}
}
}
catch (proj_init_error const& ex)
{
throw mapnik::config_error(std::string("Projection error during map.zoom_all: ") + ex.what());
}
}
void Map::zoom_all()
{
if (maximum_extent_) {
zoom_to_box(*maximum_extent_);
}
else
{
try
{
if (!layers_.size() > 0)
return;
projection proj0(srs_);
box2d<double> ext;
bool success = false;
bool first = true;
std::vector<layer>::const_iterator itr = layers_.begin();
std::vector<layer>::const_iterator end = layers_.end();
while (itr != end)
{
if (itr->isActive())
{
std::string const& layer_srs = itr->srs();
projection proj1(layer_srs);
proj_transform prj_trans(proj0,proj1);
box2d<double> layer_ext = itr->envelope();
// TODO - consider using more robust method: http://trac.mapnik.org/ticket/751
if (prj_trans.backward(layer_ext))
{
success = true;
#ifdef MAPNIK_DEBUG
std::clog << " layer " << itr->name() << " original ext: " << itr->envelope() << "\n";
std::clog << " layer " << itr->name() << " transformed to map srs: " << layer_ext << "\n";
#endif
if (first)
{
ext = layer_ext;
first = false;
}
else
{
ext.expand_to_include(layer_ext);
}
}
}
++itr;
}
if (success) {
zoom_to_box(ext);
} else {
std::ostringstream s;
s << "could not zoom to combined layer extents "
<< "using zoom_all because proj4 could not "
<< "back project any layer extents into the map srs "
<< "(set map 'maximum-extent' to override layer extents)";
throw std::runtime_error(s.str());
}
}
catch (proj_init_error & ex)
{
std::clog << "proj_init_error:" << ex.what() << "\n";
}
}
}
void feature_style_processor<Processor>::render_material(layer_rendering_material const & mat,
Processor & p)
{
std::vector<feature_type_style const*> const & active_styles = mat.active_styles_;
std::vector<featureset_ptr> const & featureset_ptr_list = mat.featureset_ptr_list_;
if (featureset_ptr_list.empty())
{
// The datasource wasn't queried because of early return
// but we have to apply compositing operations on styles
for (feature_type_style const* style : active_styles)
{
p.start_style_processing(*style);
p.end_style_processing(*style);
}
return;
}
layer const& lay = mat.lay_;
std::vector<rule_cache> const & rule_caches = mat.rule_caches_;
proj_transform prj_trans(mat.proj0_,mat.proj1_);
bool cache_features = lay.cache_features() && active_styles.size() > 1;
datasource_ptr ds = lay.datasource();
std::string group_by = lay.group_by();
// Render incrementally when the column that we group by changes value.
if (!group_by.empty())
{
featureset_ptr features = *featureset_ptr_list.begin();
if (features)
{
// Cache all features into the memory_datasource before rendering.
std::shared_ptr<featureset_buffer> cache = std::make_shared<featureset_buffer>();
feature_ptr feature, prev;
while ((feature = features->next()))
{
if (prev && prev->get(group_by) != feature->get(group_by))
{
// We're at a value boundary, so render what we have
// up to this point.
std::size_t i = 0;
for (feature_type_style const* style : active_styles)
{
cache->prepare();
render_style(p, style,
rule_caches[i],
cache,
prj_trans);
++i;
}
cache->clear();
}
cache->push(feature);
prev = feature;
}
std::size_t i = 0;
for (feature_type_style const* style : active_styles)
{
cache->prepare();
render_style(p, style, rule_caches[i], cache, prj_trans);
++i;
}
cache->clear();
}
}
else if (cache_features)
{
std::shared_ptr<featureset_buffer> cache = std::make_shared<featureset_buffer>();
featureset_ptr features = *featureset_ptr_list.begin();
if (features)
{
// Cache all features into the memory_datasource before rendering.
feature_ptr feature;
while ((feature = features->next()))
{
cache->push(feature);
}
}
std::size_t i = 0;
for (feature_type_style const* style : active_styles)
{
cache->prepare();
render_style(p, style,
rule_caches[i],
cache, prj_trans);
++i;
}
}
// We only have a single style and no grouping.
else
{
std::size_t i = 0;
std::vector<featureset_ptr>::const_iterator featuresets = featureset_ptr_list.cbegin();
for (feature_type_style const* style : active_styles)
{
featureset_ptr features = *featuresets++;
render_style(p, style,
rule_caches[i],
features,
prj_trans);
++i;
}
}
}
void feature_style_processor<Processor>::prepare_layer(layer_rendering_material & mat,
feature_style_context_map & ctx_map,
Processor & p,
double scale,
double scale_denom,
unsigned width,
unsigned height,
box2d<double> const& extent,
int buffer_size,
std::set<std::string>& names)
{
layer const& lay = mat.lay_;
std::vector<std::string> const& style_names = lay.styles();
std::size_t num_styles = style_names.size();
if (num_styles == 0)
{
MAPNIK_LOG_DEBUG(feature_style_processor)
<< "feature_style_processor: No style for layer=" << lay.name();
return;
}
mapnik::datasource_ptr ds = lay.datasource();
if (!ds)
{
MAPNIK_LOG_DEBUG(feature_style_processor)
<< "feature_style_processor: No datasource for layer=" << lay.name();
return;
}
processor_context_ptr current_ctx = ds->get_context(ctx_map);
proj_transform prj_trans(mat.proj0_,mat.proj1_);
box2d<double> query_ext = extent; // unbuffered
box2d<double> buffered_query_ext(query_ext); // buffered
double buffer_padding = 2.0 * scale;
boost::optional<int> layer_buffer_size = lay.buffer_size();
if (layer_buffer_size) // if layer overrides buffer size, use this value to compute buffered extent
{
buffer_padding *= *layer_buffer_size;
}
else
{
buffer_padding *= buffer_size;
}
buffered_query_ext.width(query_ext.width() + buffer_padding);
buffered_query_ext.height(query_ext.height() + buffer_padding);
// clip buffered extent by maximum extent, if supplied
boost::optional<box2d<double> > const& maximum_extent = m_.maximum_extent();
if (maximum_extent)
{
buffered_query_ext.clip(*maximum_extent);
}
box2d<double> layer_ext = lay.envelope();
const box2d<double> buffered_query_ext_map_srs = buffered_query_ext;
bool fw_success = false;
bool early_return = false;
// first, try intersection of map extent forward projected into layer srs
if (prj_trans.forward(buffered_query_ext, PROJ_ENVELOPE_POINTS) && buffered_query_ext.intersects(layer_ext))
{
fw_success = true;
layer_ext.clip(buffered_query_ext);
}
// if no intersection and projections are also equal, early return
else if (prj_trans.equal())
{
early_return = true;
}
// next try intersection of layer extent back projected into map srs
else if (prj_trans.backward(layer_ext, PROJ_ENVELOPE_POINTS) && buffered_query_ext_map_srs.intersects(layer_ext))
{
layer_ext.clip(buffered_query_ext_map_srs);
// forward project layer extent back into native projection
if (! prj_trans.forward(layer_ext, PROJ_ENVELOPE_POINTS))
{
MAPNIK_LOG_ERROR(feature_style_processor)
<< "feature_style_processor: Layer=" << lay.name()
<< " extent=" << layer_ext << " in map projection "
<< " did not reproject properly back to layer projection";
}
}
else
{
// if no intersection then nothing to do for layer
early_return = true;
}
std::vector<feature_type_style const*> & active_styles = mat.active_styles_;
if (early_return)
{
// check for styles needing compositing operations applied
// https://github.com/mapnik/mapnik/issues/1477
for (std::string const& style_name : style_names)
{
boost::optional<feature_type_style const&> style=m_.find_style(style_name);
if (!style)
{
continue;
}
if (style->comp_op() || style->image_filters().size() > 0)
{
if (style->active(scale_denom))
{
// we'll have to handle compositing ops
active_styles.push_back(&(*style));
}
}
}
return;
}
// if we've got this far, now prepare the unbuffered extent
// which is used as a bbox for clipping geometries
if (maximum_extent)
{
query_ext.clip(*maximum_extent);
}
box2d<double> & layer_ext2 = mat.layer_ext2_;
layer_ext2 = lay.envelope();
if (fw_success)
{
if (prj_trans.forward(query_ext, PROJ_ENVELOPE_POINTS))
{
layer_ext2.clip(query_ext);
}
}
else
{
if (prj_trans.backward(layer_ext2, PROJ_ENVELOPE_POINTS))
{
layer_ext2.clip(query_ext);
prj_trans.forward(layer_ext2, PROJ_ENVELOPE_POINTS);
}
}
std::vector<rule_cache> & rule_caches = mat.rule_caches_;
attribute_collector collector(names);
// iterate through all named styles collecting active styles and attribute names
for (std::string const& style_name : style_names)
{
boost::optional<feature_type_style const&> style=m_.find_style(style_name);
if (!style)
{
MAPNIK_LOG_ERROR(feature_style_processor)
<< "feature_style_processor: Style=" << style_name
<< " required for layer=" << lay.name() << " does not exist.";
continue;
}
std::vector<rule> const& style_rules = style->get_rules();
bool active_rules = false;
rule_cache rc;
for(rule const& r : style_rules)
{
if (r.active(scale_denom))
{
rc.add_rule(r);
active_rules = true;
collector(r);
}
}
if (active_rules)
{
rule_caches.push_back(std::move(rc));
active_styles.push_back(&(*style));
}
}
// Don't even try to do more work if there are no active styles.
if (active_styles.empty())
{
return;
}
double qw = query_ext.width()>0 ? query_ext.width() : 1;
double qh = query_ext.height()>0 ? query_ext.height() : 1;
query::resolution_type res(width/qw,
height/qh);
query q(layer_ext,res,scale_denom,extent);
q.set_variables(p.variables());
if (p.attribute_collection_policy() == COLLECT_ALL)
{
layer_descriptor lay_desc = ds->get_descriptor();
for (attribute_descriptor const& desc : lay_desc.get_descriptors())
{
q.add_property_name(desc.get_name());
}
}
else
{
for (std::string const& name : names)
{
q.add_property_name(name);
}
}
q.set_filter_factor(collector.get_filter_factor());
// Also query the group by attribute
std::string const& group_by = lay.group_by();
if (!group_by.empty())
{
q.add_property_name(group_by);
}
bool cache_features = lay.cache_features() && active_styles.size() > 1;
std::vector<featureset_ptr> & featureset_ptr_list = mat.featureset_ptr_list_;
if (!group_by.empty() || cache_features)
{
featureset_ptr_list.push_back(ds->features_with_context(q,current_ctx));
}
else
{
for(std::size_t i = 0; i < active_styles.size(); ++i)
{
featureset_ptr_list.push_back(ds->features_with_context(q,current_ctx));
}
}
}
