Function TestGradAdd

colors_test.go:9–127

(t *testing.T)

)

func TestGradAdd(t *testing.T) {
	red := color.RGBA{255, 0, 0, 255}
	green := color.RGBA{0, 255, 0, 255}
	blue := color.RGBA{0, 0, 255, 255}
	white := color.RGBA{255, 255, 255, 255}

	tests := []struct {
		name     string
		initial  Grad
		addT     float64
		addColor color.RGBA
		want     Grad
	}{
		{
			name:     "add to empty gradient",
			initial:  Grad{},
			addT:     0.5,
			addColor: red,
			want:     Grad{{0.5, red}},
		},
		{
			name:     "add at end",
			initial:  Grad{{0.0, red}},
			addT:     1.0,
			addColor: blue,
			want:     Grad{{0.0, red}, {1.0, blue}},
		},
		{
			name:     "add at beginning",
			initial:  Grad{{0.5, red}},
			addT:     0.0,
			addColor: blue,
			want:     Grad{{0.0, blue}, {0.5, red}},
		},
		{
			name:     "insert in middle maintains sort order",
			initial:  Grad{{0.0, red}, {1.0, blue}},
			addT:     0.5,
			addColor: green,
			want:     Grad{{0.0, red}, {0.5, green}, {1.0, blue}},
		},
		{
			name:     "replace existing offset",
			initial:  Grad{{0.0, red}, {0.5, green}, {1.0, blue}},
			addT:     0.5,
			addColor: white,
			want:     Grad{{0.0, red}, {0.5, white}, {1.0, blue}},
		},
		{
			name:     "clamp t below 0",
			initial:  Grad{},
			addT:     -0.5,
			addColor: red,
			want:     Grad{{0.0, red}},
		},
		{
			name:     "clamp t above 1",
			initial:  Grad{},