Function TestIntersectionLineCube

path_intersection_test.go:288–336

(t *testing.T)

}

func TestIntersectionLineCube(t *testing.T) {
	var tts = []struct {
		line, cube string
		zs         Intersections
	}{
		// secant
		{"M0 5L10 5", "C8 0 8 10 0 10", Intersections{
			{Point{6.0, 5.0}, [2]float64{0.6, 0.5}, [2]float64{0.0, 0.5 * math.Pi}, false, false},
		}},
		{"M0 1L1 1", "C0 2 1 0 1 2", Intersections{ // parallel at intersection
			{Point{0.5, 1.0}, [2]float64{0.5, 0.5}, [2]float64{0.0, 0.0}, false, false},
		}},
		{"M0 1L1 1", "M0 2C0 0 1 2 1 0", Intersections{ // parallel at intersection
			{Point{0.5, 1.0}, [2]float64{0.5, 0.5}, [2]float64{0.0, 0.0}, false, false},
		}},
		{"M0 1L1 1", "C0 3 1 -1 1 2", Intersections{ // three intersections
			{Point{0.0791512117, 1.0}, [2]float64{0.0791512117, 0.1726731646}, [2]float64{0.0, 74.05460410 / 180.0 * math.Pi}, false, false},
			{Point{0.5, 1.0}, [2]float64{0.5, 0.5}, [2]float64{0.0, 315 / 180.0 * math.Pi}, false, false},
			{Point{0.9208487883, 1.0}, [2]float64{0.9208487883, 0.8273268354}, [2]float64{0.0, 74.05460410 / 180.0 * math.Pi}, false, false},
		}},

		// tangent
		{"L0 10", "C8 0 8 10 0 10", Intersections{
			{Point{0.0, 0.0}, [2]float64{0.0, 0.0}, [2]float64{0.5 * math.Pi, 0.0}, true, false},
			{Point{0.0, 10.0}, [2]float64{1.0, 1.0}, [2]float64{0.5 * math.Pi, math.Pi}, true, false},
		}},
		{"M6 0L6 10", "C8 0 8 10 0 10", Intersections{
			{Point{6.0, 5.0}, [2]float64{0.5, 0.5}, [2]float64{0.5 * math.Pi, 0.5 * math.Pi}, true, false},
		}},

		// none
		{"M-1 0L-1 10", "C8 0 8 10 0 10", Intersections{}},
	}
	origEpsilon := Epsilon
	for _, tt := range tts {
		t.Run(fmt.Sprint(tt.line, "x", tt.cube), func(t *testing.T) {
			Epsilon = origEpsilon
			line := MustParseSVGPath(tt.line).ReverseScanner()
			cube := MustParseSVGPath(tt.cube).ReverseScanner()
			line.Scan()
			cube.Scan()

			zs := intersectionLineCube(nil, line.Start(), line.End(), cube.Start(), cube.CP1(), cube.CP2(), cube.End())
			Epsilon = 3.0 * origEpsilon
			test.T(t, zs, tt.zs)
		})
	}
	Epsilon = origEpsilon
}

func TestIntersectionLineEllipse(t *testing.T) {
	var tts = []struct {