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Speed up linear feature clipping. This makes the creation of airports much faster.

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This commit is contained in:
Christian Schmitt 2012-09-29 11:00:59 +02:00
parent edf8e8310f
commit e18c939f66
3 changed files with 27 additions and 17 deletions
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6
src/Airports/GenAirports850/airport.cxx
View file

@ -517,11 +517,11 @@ void Airport::merge_slivers( superpoly_list& polys, poly_list& slivers_list ) {
void Airport::BuildBtg(const string& root, const string_list& elev_src )
{
ClipPolyType accum;
ClipPolyType accum;
poly_list slivers;
// try to keep line accumulator in clipper format for speed...
ClipPolyType line_accum;
ClipPolyType lines;
poly_list line_slivers;
TGPolygon apt_base;
@ -608,7 +608,7 @@ void Airport::BuildBtg(const string& root, const string_list& elev_src )
make_shapefiles = false;
}
features[i]->BuildBtg( altitude, &line_polys, &line_tps, &line_accum, &rwy_lights, make_shapefiles );
features[i]->BuildBtg( &line_polys, &line_tps, &lines, &rwy_lights, make_shapefiles );
}
}
else

36
src/Airports/GenAirports850/linearfeature.cxx
View file

@ -3,6 +3,10 @@
#include <simgear/math/sg_geodesy.hxx>
#include <simgear/math/SGVec3.hxx>
#include <simgear/math/SGMisc.hxx>
#include <simgear/math/SGMath.hxx>
#include <simgear/math/SGGeometryFwd.hxx>
#include <simgear/math/SGBox.hxx>
#include <simgear/math/SGIntersect.hxx>
#include <Geometry/poly_support.hxx>
@ -929,12 +933,12 @@ int LinearFeature::Finish( bool closed, unsigned int idx )
return 1;
}
int LinearFeature::BuildBtg(float alt_m, superpoly_list* line_polys, texparams_list* line_tps, ClipPolyType* line_accum, superpoly_list* lights, bool make_shapefiles )
int LinearFeature::BuildBtg(superpoly_list* line_polys, texparams_list* line_tps, ClipPolyType* lines, superpoly_list* lights, bool make_shapefiles )
{
TGPolygon poly;
TGPolygon clipped;
TGPolygon poly, tmp;
void* ds_id = NULL; // If we are going to build shapefiles
void* l_id = NULL; // datasource and layer IDs
SGVec3d min, max, minp, maxp;
if ( make_shapefiles ) {
char ds_name[128];
@ -946,16 +950,23 @@ int LinearFeature::BuildBtg(float alt_m, superpoly_list* line_polys, texparams_l
for ( unsigned int i = 0; i < marking_polys.size(); i++)
{
poly = marking_polys[i].get_poly();
//poly = tgPolygonSimplify( poly );
//poly = remove_tiny_contours( poly );
poly.get_bounding_box(minp, maxp);
SGBoxd box1(minp, maxp);
SG_LOG(SG_GENERAL, SG_DEBUG, "LinearFeature::BuildBtg: clipping poly " << i << " of " << marking_polys.size() << " with CLIPPER ");
clipped = tgPolygonDiffClipper( poly, *line_accum );
for (int j= 0; j < lines->contours(); ++j)
{
tmp.erase();
tmp.add_contour(lines->get_contour(j), 0);
tmp.get_bounding_box(min, max);
SGBoxd box2(min, max);
// clean the poly before union with accum
clipped = reduce_degeneracy( clipped );
if ( intersects(box2, box1 ) )
{
poly = tgPolygonDiffClipper( poly, tmp );
}
}
marking_polys[i].set_poly( clipped );
marking_polys[i].set_poly( poly );
line_polys->push_back( marking_polys[i] );
/* If debugging this lf, write the poly, and the accum buffer at each step into their own layers */
@ -972,11 +983,10 @@ int LinearFeature::BuildBtg(float alt_m, superpoly_list* line_polys, texparams_l
l_id = tgShapefileOpenLayer( ds_id, layer_name );
sprintf( feature_name, "accum_%d", i );
tgShapefileCreateFeature( ds_id, l_id, *line_accum, feature_name );
tgShapefileCreateFeature( ds_id, l_id, *lines, feature_name );
}
SG_LOG(SG_GENERAL, SG_DEBUG, "LinearFeature::BuildBtg: union poly " << i << " of " << marking_polys.size() << " with CLIPPER " );
*line_accum = tgPolygonUnionClipper( poly, *line_accum );
lines->add_contour(poly.get_contour(0), 0);
line_tps->push_back( marking_tps[i] );
}

2
src/Airports/GenAirports850/linearfeature.hxx
View file

@ -97,7 +97,7 @@ public:
}
int Finish( bool closed, unsigned int idx );
int BuildBtg( float alt_m, superpoly_list* line_polys, texparams_list* line_tps, ClipPolyType* line_accum, superpoly_list* lights, bool debug );
int BuildBtg( superpoly_list* line_polys, texparams_list* line_tps, ClipPolyType* lines, superpoly_list* lights, bool debug );
// int BuildBtg( float alt_m, superpoly_list* line_polys, texparams_list* line_tps, ClipPolyType* line_accum, superpoly_list* lights );
private: