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gimp_test.go
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gimp_test.go
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package colorgrad
import (
"math"
"strings"
"testing"
"github.com/lucasb-eyer/go-colorful"
)
func TestParseGgr(t *testing.T) {
black := colorful.Color{R: 0, G: 0, B: 0}
red := colorful.Color{R: 1, G: 0, B: 0}
blue := colorful.Color{R: 0, G: 0, B: 1}
// Black to white
ggr := "GIMP Gradient\nName: My Gradient\n1\n0 0.5 1 0 0 0 1 1 1 1 1 0 0 0 0"
grad, name, _ := ParseGgr(strings.NewReader(ggr), black, black)
testStr(t, name, "My Gradient")
testStr(t, grad.At(0).Hex(), "#000000")
testStr(t, grad.At(1).Hex(), "#ffffff")
testStr(t, grad.At(-0.5).Hex(), "#000000")
testStr(t, grad.At(1.5).Hex(), "#ffffff")
testStr(t, grad.At(math.NaN()).Hex(), "#000000")
// Foreground to background
ggr = "GIMP Gradient\nName: My Gradient\n1\n0 0.5 1 0 0 0 1 1 1 1 1 0 0 1 3"
grad, name, _ = ParseGgr(strings.NewReader(ggr), red, blue)
testStr(t, grad.At(0).Hex(), "#ff0000")
testStr(t, grad.At(1).Hex(), "#0000ff")
// Blending function: step
ggr = "GIMP Gradient\nName: My Gradient\n1\n0 0.5 1 1 0 0 1 0 0 1 1 5 0 0 0"
grad, name, _ = ParseGgr(strings.NewReader(ggr), black, black)
testStr(t, grad.At(0.00).Hex(), "#ff0000")
testStr(t, grad.At(0.25).Hex(), "#ff0000")
testStr(t, grad.At(0.49).Hex(), "#ff0000")
testStr(t, grad.At(0.51).Hex(), "#0000ff")
testStr(t, grad.At(0.75).Hex(), "#0000ff")
testStr(t, grad.At(1.00).Hex(), "#0000ff")
// Coloring type: HSV CCW (white to blue)
ggr = "GIMP Gradient\nName: My Gradient\n1\n0 0.5 1 1 1 1 1 0 0 1 1 0 1 0 0"
grad, name, _ = ParseGgr(strings.NewReader(ggr), black, black)
testStr(t, grad.At(0.0).Hex(), "#ffffff")
testStr(t, grad.At(0.5).Hex(), "#80ff80")
testStr(t, grad.At(1.0).Hex(), "#0000ff")
// Coloring type: HSV CW (white to blue)
ggr = "GIMP Gradient\nName: My Gradient\n1\n0 0.5 1 1 1 1 1 0 0 1 1 0 2 0 0"
grad, name, _ = ParseGgr(strings.NewReader(ggr), black, black)
testStr(t, grad.At(0.0).Hex(), "#ffffff")
testStr(t, grad.At(0.5).Hex(), "#ff80ff")
testStr(t, grad.At(1.0).Hex(), "#0000ff")
}
func TestParseGgrError(t *testing.T) {
black := colorful.Color{R: 0, G: 0, B: 0}
_, _, err0 := ParseGgr(strings.NewReader(""), black, black)
if err0 == nil {
t.Error()
}
_, _, err1 := ParseGgr(strings.NewReader("GIMP Pallete"), black, black)
if err1 == nil {
t.Error()
}
_, _, err2 := ParseGgr(strings.NewReader("GIMP Gradient\nxx"), black, black)
if err2 == nil {
t.Error()
}
_, _, err3 := ParseGgr(strings.NewReader("GIMP Gradient\nName: Gradient\nx"), black, black)
if err3 == nil {
t.Error()
}
_, _, err4 := ParseGgr(strings.NewReader("GIMP Gradient\nName: Gradient\n1\n0 0 0"), black, black)
if err4 == nil {
t.Error()
}
}