func PolySpec2(c gospec.Context) {
p := linear.Poly{
{-1, 0},
{-3, 0},
{0, 10},
{3, 0},
{1, 0},
{2, 1},
{-2, 1},
}
c.Specify("Check that exterior and interior segments of a polygon are correctly identified.", func() {
visible_exterior := []linear.Seg2{
linear.MakeSeg2(-1, 0, -3, 0),
linear.MakeSeg2(2, 1, -2, 1),
linear.MakeSeg2(3, 0, 1, 0),
}
visible_interior := []linear.Seg2{
linear.MakeSeg2(2, 1, -2, 1),
linear.MakeSeg2(-3, 0, 0, 10),
linear.MakeSeg2(0, 10, 3, 0),
linear.MakeSeg2(-1, 0, -3, 0),
linear.MakeSeg2(3, 0, 1, 0),
}
c.Expect(p.VisibleExterior(linear.Vec2{0, -10}), ContainsExactly, visible_exterior)
c.Expect(p.VisibleInterior(linear.Vec2{0, 5}), ContainsExactly, visible_interior)
})
}
func PolySpec1(c gospec.Context) {
p := linear.Poly{
{0, 0},
{-1, 2},
{0, 1},
{1, 2},
}
c.Specify("Check that exterior and interior segments of a polygon are correctly identified.", func() {
visible_exterior := []linear.Seg2{
linear.MakeSeg2(-1, 2, 0, 1),
linear.MakeSeg2(0, 1, 1, 2),
}
visible_interior := []linear.Seg2{
linear.MakeSeg2(0, 1, 1, 2),
linear.MakeSeg2(1, 2, 0, 0),
linear.MakeSeg2(0, 0, -1, 2),
}
c.Expect(p.VisibleExterior(linear.Vec2{0, 2}), ContainsExactly, visible_exterior)
c.Expect(p.VisibleInterior(linear.Vec2{0.5, 1.4}), ContainsExactly, visible_interior)
})
}