C++ (Cpp) Polygon::toPolygon_with_holes_2 Examples

Example #1

File: gdalgeometricattributes.cpp Project: christianurich/DynaMind-GDALModules

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());
}

Example #2

File: parceling.cpp Project: christianurich/DynaMind-GDALModules

void GDALParceling::run()
{
	DM::GDALSystem * city = this->getGDALData("city");

	cityblocks.setCurrentGDALSystem(city);
	parcels.setCurrentGDALSystem(city);

	cityblocks.resetReading();
	OGRFeature *poFeature;
	int counter = 0;
	while( (poFeature = cityblocks.getNextFeature()) != NULL ) {
		counter++;
		char* geo;

		poFeature->GetGeometryRef()->exportToWkt(&geo);
		std::auto_ptr<  SFCGAL::Geometry > g( SFCGAL::io::readWkt(geo));

		switch ( g->geometryTypeId() ) {
		case SFCGAL::TYPE_POLYGON:
			break;
		default:
			continue;
		}
		SFCGAL::Polygon poly = g->as<SFCGAL::Polygon>();

		//Transfer to GDAL polygon
		Polygon_with_holes_2 p = poly.toPolygon_with_holes_2(true);
		splitePoly(p);
	}
	parcels.syncAlteredFeatures();
	DM::Logger(DM::Debug) << this->counter_added;
}

Example #3

File: gdalgeometricattributes.cpp Project: christianurich/DynaMind-GDALModules

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;
}