double GDALGeometricAttributes::percentageFilled(OGRPolygon * ogr_poly) {
char* geo;
ogr_poly->exportToWkt(&geo);
std::auto_ptr< SFCGAL::Geometry > g( SFCGAL::io::readWkt(geo));
SFCGAL::Polygon poly = g->as<SFCGAL::Polygon>();
if (!poly.toPolygon_2(false).is_simple()) {
DM::Logger(DM::Warning) << "Polygon is not simple";
return -1;
}
//Transfer to GDAL polygon
Polygon_with_holes_2 p = poly.toPolygon_with_holes_2(true);
Polygon_2 p_c;
CGAL::convex_hull_2(p.outer_boundary().vertices_begin(), p.outer_boundary().vertices_end(), std::back_inserter(p_c));
//Cacluate Minimal Rect
Polygon_2 p_m;
CGAL::min_rectangle_2(p_c.vertices_begin(), p_c.vertices_end(), std::back_inserter(p_m));
return ogr_poly->get_Area() / CGAL::to_double(p_m.area());
}
void OffsetWorker::run()
{
std::auto_ptr< SFCGAL::Geometry > g( SFCGAL::io::readWkt(wkt_poly));
OGRFree(wkt_poly); //Not needed after here
switch ( g->geometryTypeId() ) {
case SFCGAL::TYPE_POLYGON:
break;
default:
return;
}
SFCGAL::Polygon poly = g->as<SFCGAL::Polygon>();
Polygon_2 p = poly.toPolygon_2(true);
this->offsetPolygon(p, offset);
}
double GDALGeometricAttributes::aspectRationBB(OGRPolygon * ogr_poly) {
char* geo;
ogr_poly->exportToWkt(&geo);
std::auto_ptr< SFCGAL::Geometry > g( SFCGAL::io::readWkt(geo));
SFCGAL::Polygon poly = g->as<SFCGAL::Polygon>();
if (!poly.toPolygon_2(false).is_simple()) {
DM::Logger(DM::Warning) << "Polygon is not simple";
return -1;
}
//Transfer to GDAL polygon
Polygon_with_holes_2 p = poly.toPolygon_with_holes_2(true);
Polygon_2 p_c;
CGAL::convex_hull_2(p.outer_boundary().vertices_begin(), p.outer_boundary().vertices_end(), std::back_inserter(p_c));
//Cacluate Minimal Rect
Polygon_2 p_m;
CGAL::min_rectangle_2(p_c.vertices_begin(), p_c.vertices_end(), std::back_inserter(p_m));
Point_2 p1 = p_m.vertex(0);
Point_2 p2 = p_m.vertex(1);
Point_2 p3 = p_m.vertex(2);
Point_2 p4 = p_m.vertex(3);
Vector_2 v1 = (p2-p1);
Vector_2 v2 = (p3-p2);
double l1 = sqrt(CGAL::to_double(v1.squared_length()));
double l2 = sqrt(CGAL::to_double(v2.squared_length()));
double aspect_ration = l1/l2;
if (aspect_ration < 1.0) {
aspect_ration = 1.0/aspect_ration;
}
return aspect_ration;
}