62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
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/*
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1 Poly.cpp is an interface for external polygon libraries.
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This is mainly used to calculate polygon area and intersections.
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Currently, boost is utilized to perform these calculations.
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*/
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#include "interpolate.h"
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#include "poly_boost.h"
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#include <boost/geometry/geometry.hpp>
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#include <boost/geometry/geometries/register/point.hpp>
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#include <boost/geometry/geometries/register/ring.hpp>
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#include <boost/geometry/geometry.hpp>
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#include <boost/foreach.hpp>
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/*
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1.1 Constructor, which creates a polygon from the given face and
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transformations.
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*/
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Poly::Poly(Face& f, double offx, double offy, double scalex, double scaley,
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bool withholes) {
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using boost::geometry::append;
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using boost::geometry::correct;
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// Boost wants the polygon to be clockwise oriented, so push in reverse order
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for (unsigned int i = f.v.size(); i > 0; i--) {
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double x = (f.v[i-1].s.x - offx) * scalex / SCALEOUT;
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double y = (f.v[i-1].s.y - offy) * scaley / SCALEOUT;
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boost::geometry::model::d2::point_xy<double> p(x, y);
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boost::geometry::append(polygon, p);
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}
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boost::geometry::correct(polygon);
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}
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/*
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1.2 ~Area~ returns the area of this Poly object.
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*/
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double Poly::Area() {
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return boost::geometry::area(polygon);
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}
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/*
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1.3 ~IntersectionArea~ returns the intersecting area of this Poly object
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with the given Poly object.
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*/
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double Poly::IntersectionArea (Poly p) {
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double ret = 0;
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std::deque<Polygon> out;
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boost::geometry::intersection(polygon, p.polygon, out);
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BOOST_FOREACH(Polygon const& p2, out) {
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ret += boost::geometry::area(p2);
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}
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return ret;
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}
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