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// Copyright ©2016 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package moreland
import (
"fmt"
"image/color"
"testing"
"golang.org/x/exp/rand"
//"gonum.org/v1/gonum/floats"
)
/*
func TestCreateLuminance(t *testing.T) {
type testHolder struct {
controlColors []color.Color
want *luminance
name string
}
tests := []testHolder{
{
name: "BlackBody",
controlColors: []color.Color{
color.NRGBA{0, 0, 0, 255},
color.NRGBA{178, 34, 34, 255},
color.NRGBA{227, 105, 5, 255},
color.NRGBA{238, 210, 20, 255},
color.NRGBA{255, 255, 255, 255},
},
want: BlackBody().(*luminance),
},
{
name: "ExtendedBlackBody",
controlColors: []color.Color{
color.NRGBA{0, 0, 0, 255},
color.NRGBA{0, 24, 168, 255},
color.NRGBA{99, 0, 228, 255},
color.NRGBA{220, 20, 60, 255},
color.NRGBA{255, 117, 56, 255},
color.NRGBA{238, 210, 20, 255},
color.NRGBA{255, 255, 255, 255},
},
want: ExtendedBlackBody().(*luminance),
},
{
name: "Kindlmann",
controlColors: []color.Color{
color.NRGBA{0, 0, 0, 255},
color.NRGBA{46, 4, 76, 255},
color.NRGBA{63, 7, 145, 255},
color.NRGBA{8, 66, 165, 255},
color.NRGBA{5, 106, 106, 255},
color.NRGBA{7, 137, 169, 255},
color.NRGBA{8, 168, 26, 255},
color.NRGBA{84, 194, 9, 255},
color.NRGBA{196, 206, 10, 255},
color.NRGBA{252, 220, 197, 255},
color.NRGBA{255, 255, 255, 255},
},
want: Kindlmann().(*luminance),
},
{
name: "ExtendedKindlmann",
controlColors: []color.Color{
color.NRGBA{0, 0, 0, 255},
color.NRGBA{44, 5, 103, 255},
color.NRGBA{3, 67, 67, 255},
color.NRGBA{5, 103, 13, 255},
color.NRGBA{117, 124, 6, 255},
color.NRGBA{246, 104, 74, 255},
color.NRGBA{250, 149, 241, 255},
color.NRGBA{232, 212, 253, 255},
color.NRGBA{255, 255, 255, 255},
},
want: ExtendedKindlmann().(*luminance),
},
}
for _, test := range tests {
cmap, err := NewLuminance(test.controlColors)
if err != nil {
t.Fatal(err)
}
if !luminanceEqualWithin(cmap.(*luminance), test.want, 1.0e-14) {
t.Errorf("%s: have %#v, want %#v", test.name, cmap, test.want)
}
}
}
func luminanceEqualWithin(a, b *luminance, tol float64) bool {
if len(a.colors) != len(b.colors) {
return false
}
if len(a.scalars) != len(b.scalars) {
return false
}
for i, ac := range a.colors {
if !cieLABEqualWithin(ac, b.colors[i], tol) {
return false
}
}
for i, av := range a.scalars {
if !floats.EqualWithinAbsOrRel(av, b.scalars[i], tol, tol) {
return false
}
}
return floats.EqualWithinAbsOrRel(a.alpha, b.alpha, tol, tol) &&
floats.EqualWithinAbsOrRel(a.max, b.max, tol, tol) &&
floats.EqualWithinAbsOrRel(a.min, b.min, tol, tol)
}
func cieLABEqualWithin(a, b cieLAB, tol float64) bool {
return floats.EqualWithinAbsOrRel(a.L, b.L, tol, tol) &&
floats.EqualWithinAbsOrRel(a.A, b.A, tol, tol) &&
floats.EqualWithinAbsOrRel(a.B, b.B, tol, tol)
}
*/
func TestExtendedBlackBody(t *testing.T) {
scalars := []float64{0, 0.21873483862751875, 0.34506542513775906, 0.4702980511087303, 0.6517482203230537, 0.8413253643355525, 1}
want := []color.Color{
color.NRGBA{0, 0, 0, 255},
color.NRGBA{0, 24, 168, 255},
color.NRGBA{99, 0, 228, 255},
color.NRGBA{220, 20, 60, 255},
color.NRGBA{255, 117, 56, 255},
color.NRGBA{238, 210, 20, 255},
color.NRGBA{255, 255, 255, 255},
}
colors := ExtendedBlackBody()
colors.SetMax(1)
for i, scalar := range scalars {
c, err := colors.At(scalar)
if err != nil {
t.Fatal(err)
}
if !similar(c, want[i], bitTolerance) {
t.Errorf("color %d: have %+v, want %+v", i, c, want[i])
}
}
}
// floatToUint32 converts a float64 in the range [0, 1] to a uint32 in the range
// [0, 0xffff].
func floatToUint32(f float64) uint32 {
return uint32(f * 0xffff)
}
func BenchmarkLuminance_At(b *testing.B) {
pBase := ExtendedBlackBody()
for n := 2; n < 12; n += 2 {
p, err := NewLuminance(pBase.Palette(n).Colors())
if err != nil {
b.Fatal(err)
}
p.SetMax(1)
rand.Seed(1)
b.Run(fmt.Sprintf("%d controls", n), func(b *testing.B) {
for i := 0; i < b.N; i++ {
if _, err := p.At(rand.Float64()); err != nil {
b.Fatal(err)
}
}
})
}
}
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