[dlib] Geometry

#include <dlib/geometry.h>
#include <dlib/numeric_constants.h>

using namespace std;
using namespace dlib;

int main(void) {

    // dlib::line object
    line lA = line(dpoint(0, 2), dpoint(5, 0));
    line lB = line(dpoint(-5, 5), dpoint(3, -7));
    dpoint pA = dpoint(1.5, 3.5);

    cout << lB.normal() << endl;
    cout << intersect(lA, lB) << endl;
    cout << angle_between_lines(lA, lB) * pi / 180 << endl;
    cout << signed_distance_to_line(lA, pA) << endl;



    // polygon_area
    std::vector<dpoint> polygon;
    polygon.push_back(dpoint(1.0, 1.0));
    polygon.push_back(dpoint(1.0, -4.0));
    polygon.push_back(dpoint(3.0, -5.0));
    polygon.push_back(dpoint(3.0, -2.0));
    cout << polygon_area(polygon) << endl;
}