private static void TestIntervalOps(R2Rect x, R2Rect y, string expected_rexion,
R2Rect expected_union, R2Rect expected_intersection)
{
// Test all of the interval operations on the given pair of intervals.
// "expected_rexion" is a sequence of "T" and "F" characters corresponding
// to the expected results of Contains(), InteriorContains(), Intersects(),
// and InteriorIntersects() respectively.
Assert.Equal(expected_rexion[0] == 'T', x.Contains(y));
Assert.Equal(expected_rexion[1] == 'T', x.InteriorContains(y));
Assert.Equal(expected_rexion[2] == 'T', x.Intersects(y));
Assert.Equal(expected_rexion[3] == 'T', x.InteriorIntersects(y));
Assert.Equal(x.Union(y) == x, x.Contains(y));
Assert.Equal(!x.Intersection(y).IsEmpty(), x.Intersects(y));
Assert.Equal(expected_union, x.Union(y));
Assert.Equal(expected_intersection, x.Intersection(y));
R2Rect r = x;
r = r.AddRect(y);
Assert.Equal(expected_union, r);
if (y.GetSize() == new R2Point(0, 0))
{
r = x;
r = r.AddPoint(y.Lo());
Assert.Equal(expected_union, r);
}
}
// Given a point P representing a possibly clipped endpoint A of an edge AB,
// verify that "clip" contains P, and that if clipping occurred (i.e., P != A)
// then P is on the boundary of "clip".
private static void CheckPointOnBoundary(R2Point p, R2Point a, R2Rect clip)
{
Assert.True(clip.Contains(p));
if (p != a)
{
Assert.False(clip.Contains(new R2Point(MathUtils.NextAfter(p[0], a[0]),
MathUtils.NextAfter(p[1], a[1]))));
}
}