improve the map.query_point/query_map_point implementation, now throwing for invalid coords or projection transformations
This commit is contained in:
Dane Springmeyer
parent
a4b3daf181
commit
5767c65470
4 changed files with 160 additions and 67 deletions
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@ -9,6 +9,8 @@ For a complete change history, see the SVN log.
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## Mapnik 2.1.0
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- Improved error feedback for invalid values passed to map.query_point
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- Fixed rendering of thin svg lines (#1129)
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- Improved logging/debugging system with release logs and file redirection (#937 and partially #986, #467)
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97
src/map.cpp
97
src/map.cpp
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@ -564,85 +564,66 @@ CoordTransform Map::view_transform() const
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featureset_ptr Map::query_point(unsigned index, double x, double y) const
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{
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if (!current_extent_.valid())
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{
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throw std::runtime_error("query_point: map extent is not intialized, you need to set a valid extent before querying");
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}
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if (!current_extent_.intersects(x,y))
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{
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throw std::runtime_error("query_point: x,y coords do not intersect map extent");
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}
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if (index < layers_.size())
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{
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mapnik::layer const& layer = layers_[index];
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try
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{
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double z = 0;
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mapnik::projection dest(srs_);
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mapnik::projection source(layer.srs());
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proj_transform prj_trans(source,dest);
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prj_trans.backward(x,y,z);
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double minx = current_extent_.minx();
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double miny = current_extent_.miny();
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double maxx = current_extent_.maxx();
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double maxy = current_extent_.maxy();
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prj_trans.backward(minx,miny,z);
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prj_trans.backward(maxx,maxy,z);
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double tol = (maxx - minx) / width_ * 3;
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mapnik::datasource_ptr ds = layer.datasource();
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if (ds)
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{
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MAPNIK_LOG_DEBUG(map) << "map: Query at point tol=" << tol << "(" << x << "," << y << ")";
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mapnik::projection dest(srs_);
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mapnik::projection source(layer.srs());
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proj_transform prj_trans(source,dest);
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double z = 0;
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if (!prj_trans.equal() && !prj_trans.backward(x,y,z))
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{
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throw std::runtime_error("query_point: could not project x,y into layer srs");
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}
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// TODO - pass tolerance to features_at_point as well
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featureset_ptr fs = ds->features_at_point(mapnik::coord2d(x,y));
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if (fs)
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{
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mapnik::box2d<double> map_ex = current_extent_;
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if (maximum_extent_) {
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map_ex.clip(*maximum_extent_);
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}
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if (!prj_trans.backward(map_ex,PROJ_ENVELOPE_POINTS))
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{
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std::ostringstream s;
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s << "query_point: could not project map extent '" << map_ex
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<< "' into layer srs for tolerance calculation";
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throw std::runtime_error(s.str());
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}
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double tol = (map_ex.maxx() - map_ex.minx()) / width_ * 3;
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MAPNIK_LOG_DEBUG(map) << "map: Query at point tol=" << tol << "(" << x << "," << y << ")";
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return boost::make_shared<filter_featureset<hit_test_filter> >(fs,
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hit_test_filter(x,y,tol));
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}
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}
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catch (...)
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{
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MAPNIK_LOG_ERROR(map) << "Exception caught in \"query_point\"";
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}
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else
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{
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std::ostringstream s;
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s << "Invalid layer index passed to query_point: '" << index << "'";
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if (layers_.size() > 0) s << " for map with " << layers_.size() << " layers(s)";
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else s << " (map has no layers)";
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throw std::out_of_range(s.str());
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}
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return featureset_ptr();
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}
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featureset_ptr Map::query_map_point(unsigned index, double x, double y) const
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{
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if ( index< layers_.size())
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{
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mapnik::layer const& layer = layers_[index];
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CoordTransform tr = view_transform();
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tr.backward(&x,&y);
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try
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{
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mapnik::projection dest(srs_);
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mapnik::projection source(layer.srs());
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proj_transform prj_trans(source,dest);
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double z = 0;
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prj_trans.backward(x,y,z);
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double minx = current_extent_.minx();
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double miny = current_extent_.miny();
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double maxx = current_extent_.maxx();
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double maxy = current_extent_.maxy();
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prj_trans.backward(minx,miny,z);
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prj_trans.backward(maxx,maxy,z);
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double tol = (maxx - minx) / width_ * 3;
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mapnik::datasource_ptr ds = layer.datasource();
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if (ds)
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{
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MAPNIK_LOG_DEBUG(map) << "map: Query at point tol=" << tol << "(" << x << "," << y << ")";
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featureset_ptr fs = ds->features_at_point(mapnik::coord2d(x,y));
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if (fs)
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return boost::make_shared<filter_featureset<hit_test_filter> >(fs,
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hit_test_filter(x,y,tol));
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}
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}
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catch (...)
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{
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MAPNIK_LOG_ERROR(map) << "Exception caught in \"query_map_point\"";
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}
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}
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return featureset_ptr();
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return query_point(index,x,y);
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}
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Map::~Map() {}
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107
tests/python_tests/map_query_test.py
Normal file
107
tests/python_tests/map_query_test.py
Normal file
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@ -0,0 +1,107 @@
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#!/usr/bin/env python
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from nose.tools import *
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from utilities import execution_path
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from copy import deepcopy
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import os, mapnik
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def setup():
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# All of the paths used are relative, if we run the tests
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# from another directory we need to chdir()
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os.chdir(execution_path('.'))
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# map has no layers
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@raises(IndexError)
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def test_map_query_throw1():
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m = mapnik.Map(256,256)
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m.zoom_to_box(mapnik.Box2d(-1,-1,0,0))
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m.query_point(0,0,0)
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# only positive indexes
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@raises(IndexError)
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def test_map_query_throw2():
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m = mapnik.Map(256,256)
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m.query_point(-1,0,0)
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# map has never been zoomed (nodata)
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@raises(RuntimeError)
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def test_map_query_throw3():
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m = mapnik.Map(256,256)
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m.query_point(0,0,0)
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# map has never been zoomed (even with data)
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@raises(RuntimeError)
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def test_map_query_throw4():
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m = mapnik.Map(256,256)
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mapnik.load_map(m,'../data/good_maps/agg_poly_gamma_map.xml')
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m.query_point(0,0,0)
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# invalid coords in general (do not intersect)
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@raises(RuntimeError)
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def test_map_query_throw5():
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m = mapnik.Map(256,256)
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mapnik.load_map(m,'../data/good_maps/agg_poly_gamma_map.xml')
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m.zoom_all()
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m.query_point(0,9999999999999999,9999999999999999)
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# invalid coords for back projecting
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@raises(RuntimeError)
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def test_map_query_throw6():
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m = mapnik.Map(256,256)
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mapnik.load_map(m,'../data/good_maps/merc2wgs84_reprojection.xml')
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wgs84_bounds = mapnik.Box2d(-180,-90,180,90)
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m.maximum_extent = wgs84_bounds
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m.zoom_all()
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m.query_point(0,-180,-90)
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def test_map_query_works1():
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m = mapnik.Map(256,256)
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mapnik.load_map(m,'../data/good_maps/wgs842merc_reprojection.xml')
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merc_bounds = mapnik.Box2d(-20037508.34,-20037508.34,20037508.34,20037508.34)
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m.maximum_extent = merc_bounds
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m.zoom_all()
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fs = m.query_point(0,-11012435.5376, 4599674.6134) # somewhere in kansas
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feat = fs.next()
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eq_(feat.attributes['NAME_FORMA'],u'United States of America')
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def test_map_query_works2():
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m = mapnik.Map(256,256)
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mapnik.load_map(m,'../data/good_maps/merc2wgs84_reprojection.xml')
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wgs84_bounds = mapnik.Box2d(-179.999999975,-85.0511287776,179.999999975,85.0511287776)
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m.maximum_extent = wgs84_bounds
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# caution - will go square due to evil aspect_fix_mode backhandedness
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m.zoom_all()
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#mapnik.render_to_file(m,'works2.png')
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# valid that aspec_fix_mode modified the bbox
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eq_(m.envelope(),mapnik.Box2d(-179.999999975,-179.999999975,179.999999975,179.999999975))
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fs = m.query_point(0,-98.9264, 38.1432) # somewhere in kansas
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feat = fs.next()
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eq_(feat.attributes['NAME'],u'United States')
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def test_map_query_in_pixels_works1():
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m = mapnik.Map(256,256)
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mapnik.load_map(m,'../data/good_maps/wgs842merc_reprojection.xml')
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merc_bounds = mapnik.Box2d(-20037508.34,-20037508.34,20037508.34,20037508.34)
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m.maximum_extent = merc_bounds
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m.zoom_all()
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fs = m.query_map_point(0,55,100) # somewhere in middle of us
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feat = fs.next()
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eq_(feat.attributes['NAME_FORMA'],u'United States of America')
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def test_map_query_in_pixels_works2():
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m = mapnik.Map(256,256)
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mapnik.load_map(m,'../data/good_maps/merc2wgs84_reprojection.xml')
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wgs84_bounds = mapnik.Box2d(-179.999999975,-85.0511287776,179.999999975,85.0511287776)
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m.maximum_extent = wgs84_bounds
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# caution - will go square due to evil aspect_fix_mode backhandedness
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m.zoom_all()
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# valid that aspec_fix_mode modified the bbox
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eq_(m.envelope(),mapnik.Box2d(-179.999999975,-179.999999975,179.999999975,179.999999975))
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fs = m.query_map_point(0,55,100) # somewhere in middle of us
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feat = fs.next()
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eq_(feat.attributes['NAME'],u'United States')
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if __name__ == "__main__":
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setup()
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[eval(run)() for run in dir() if 'test_' in run]
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@ -69,17 +69,20 @@ def test_dataraster_query_point():
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_map = mapnik.Map(256,256, srs)
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_map.layers.append(lyr)
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# point inside raster extent with valid data
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x, y = 427417, 4477517
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x, y = 556113.0,4381428.0 # center of extent of raster
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_map.zoom_all()
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features = _map.query_point(0,x,y).features
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assert len(features) == 1
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feat = features[0]
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center = feat.envelope().center()
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assert center.x==x and center.y==y, center
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value = feat['value']
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assert value == 21.0, value
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assert value == 18.0, value
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# point outside raster extent
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# point inside map extent but outside raster extent
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current_box = _map.envelope()
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current_box.expand_to_include(-427417,4477517)
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_map.zoom_to_box(current_box)
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features = _map.query_point(0,-427417,4477517).features
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assert len(features) == 0
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