public void triangle_inside_square()
{
List <xy> p1 = ut.MakePoly(new xy(0, 0), new xy(4, 0), new xy(4, 4), new xy(0, 4));
List <xy> p2 = ut.MakePoly(new xy(1, 1), new xy(3, 1), new xy(2, 3));
ppi2d pi = new ppi2d(p1, p2);
Assert.AreEqual(ut.PolygonArea2d(p2), ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetIntersection())));
Assert.AreEqual(4 * 4, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetUnion())));
Assert.AreEqual(4 * 4 - ut.PolygonArea2d(p2), ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetDifference1())));
Assert.AreEqual(0, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetDifference2())));
}
public void triangle_touching_square_at_vertex()
{
List <xy> p1 = ut.MakePoly(new xy(0, 0), new xy(4, 0), new xy(4, 4), new xy(0, 4));
List <xy> p2 = ut.MakePoly(new xy(3, 3), new xy(5, 5), new xy(3, 7));
ppi2d pi = new ppi2d(p1, p2);
Assert.AreEqual(0.5, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetIntersection())));
Assert.AreEqual(4 * 4 + 2 * 4 / 2 - 0.5, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetUnion())));
Assert.AreEqual(4 * 4 - 0.5, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetDifference1())));
Assert.AreEqual(2 * 4 / 2 - 0.5, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetDifference2())));
}
public void simple()
{
// two 4x4 squares, overlap area is 2x2
List <xy> p1 = ut.MakePoly(new xy(0, 0), new xy(4, 0), new xy(4, 4), new xy(0, 4));
List <xy> p2 = ut.MakePoly(new xy(2, 2), new xy(6, 2), new xy(6, 6), new xy(2, 6));
ppi2d pi = new ppi2d(p1, p2);
Assert.AreEqual(2 * 2, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetIntersection())));
Assert.AreEqual(4 * 4 + 4 * 4 - 2 * 2, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetUnion())));
Assert.AreEqual(4 * 4 - 2 * 2, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetDifference1())));
Assert.AreEqual(4 * 4 - 2 * 2, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetDifference2())));
}
public void nasty_case()
{
List <xy> p1 = ut.MakePoly(new xy(0, 0), new xy(10, 0), new xy(10, 1), new xy(0, 1), new xy(0, 2), new xy(5, 2), new xy(5, 3), new xy(0, 3), new xy(0, 4), new xy(10, 4), new xy(10, 5), new xy(0, 5), new xy(0, 6), new xy(5, 6), new xy(5, 7), new xy(0, 7), new xy(0, 8), new xy(10, 8), new xy(10, 9), new xy(0, 9), new xy(0, 10), new xy(10, 10), new xy(10, 11), new xy(-1, 11), new xy(-1, 0));
List <xy> p2 = ut.MakePoly(new xy(5, 0), new xy(6, 0), new xy(6, 11), new xy(5, 11));
ppi2d pi = new ppi2d(p1, p2);
Assert.AreEqual(11, ut.PolygonArea2d(p2));
Assert.AreEqual(11 + 1 + 6 + 1 + 11 + 1 + 6 + 1 + 11 + 1 + 11, ut.PolygonArea2d(p1));
Assert.AreEqual(4, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetIntersection())));
Assert.AreEqual(ut.PolygonArea2d(p1) + 3 + 3 + 1, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetUnion())));
Assert.AreEqual(ut.PolygonArea2d(p1) - 4, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetDifference1())));
Assert.AreEqual(7, ut.PolygonArea2d(ppi2d.FindTheLoops(pi.GetDifference2())));
}