Boost Geometry intersection testing.

boost-geo-test.cpp

BOOST_GEOMETRY_REGISTER_POINT_2D(cv::Point_<int>, int, cs::cartesian, x, y);
BOOST_GEOMETRY_REGISTER_BOX(cv::Rect, cv::Point, tl(), br());
BOOST_GEOMETRY_REGISTER_RING(dft::Contour); // Contour = std::vector<cv::Point>

typedef box_view<cv::Rect> box_view;
box_view activeRegion(r);

Contour correctedContour = originalContour;
correct(correctedContour);

double activeRegionArea = area(activeRegion);
double contourArea = area(correctedContour);

Contour intersectionContour;
intersection(activeRegion, correctedContour, intersectionContour);
correct(intersectionContour);
double intersectionArea = area(intersectionContour);

std::cout << wkt<box_view>(activeRegion) << std::endl;
std::cout << wkt<Contour>(correctedContour) << std::endl;
std::cout << wkt<Contour>(intersectionContour) << std::endl;