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skip rendering specific coordinates which cannot be back projected from the layer srs into the map srs, avoiding the previous outcome of full skipping of features (this is at the cost of potentially odd looking polygons, but should not impact performance) - closes #308

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This commit is contained in:
Dane Springmeyer 2011-04-15 22:13:23 +00:00
parent 69eb5c4579
commit 5c799b2174
1 changed files with 27 additions and 2 deletions
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29
include/mapnik/ctrans.hpp
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@ -28,6 +28,7 @@
#include <algorithm>
#include <mapnik/box2d.hpp>
#include <mapnik/vertex.hpp>
#include <mapnik/coord_array.hpp>
#include <mapnik/proj_transform.hpp>
@ -70,14 +71,37 @@ struct MAPNIK_DECL coord_transform2
geom_(geom),
prj_trans_(prj_trans) {}
unsigned vertex(double * x , double * y) const
unsigned vertex(double * x , double * y) const
{
unsigned command;
bool ok = false;
bool skipped_points = false;
while (!ok)
{
command = geom_.vertex(x,y);
double z=0;
ok = prj_trans_.backward(*x,*y,z);
if (!ok) {
skipped_points = true;
}
ok = ok || (command == SEG_END);
}
if (skipped_points && (command == SEG_LINETO))
{
command = SEG_MOVETO;
}
t_.forward(x,y);
return command;
}
/*unsigned vertex(double * x , double * y) const
{
unsigned command = geom_.vertex(x,y);
double z=0;
prj_trans_.backward(*x,*y,z);
t_.forward(x,y);
return command;
}
}*/
void rewind (unsigned pos)
{
@ -94,6 +118,7 @@ private:
Geometry const& geom_;
proj_transform const& prj_trans_;
};
template <typename Transform,typename Geometry>
struct MAPNIK_DECL coord_transform3