mirror of
https://github.com/taigrr/colorhash.git
synced 2026-04-02 03:08:48 -07:00
Tai Groot
bf06224d7a
* chore: update deps, fix escape codes, expand tests, add README - Bump Go 1.18 → 1.26, simplecolorpalettes v0.9.5 → v0.9.7 - Fix swapped fg/bg ANSI escape code values in trueColorString - Expand test suite from 2 to 13 tests (determinism, positivity, color assignment, background contrast, stringer palette) - Add README with usage examples * feat: add OKLCH-aware palette generation Add GenerateOKLCHPalette() which creates n evenly-spaced colors in the OKLCH color space at a given lightness and chroma. This produces perceptually uniform palettes where all colors appear equally bright. Uses the new OKLCH support from simplecolorpalettes. Note: go.mod contains a replace directive for local development that must be removed before merge (after simplecolorpalettes is published). * build: update simplecolorpalettes to v0.9.8 (charmtone palette)
69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
package colorhash
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import (
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"math"
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"testing"
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)
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func TestGenerateOKLCHPalette(t *testing.T) {
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palette := GenerateOKLCHPalette(8, 0.7, 0.15)
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if len(palette) != 8 {
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t.Fatalf("expected 8 colors, got %d", len(palette))
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}
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// All colors should have approximately the same lightness and chroma
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for i, c := range palette {
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oklch := c.ToOKLCH()
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if math.Abs(oklch.L-0.7) > 0.05 {
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t.Errorf("color %d: L = %f, expected ~0.7", i, oklch.L)
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}
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if math.Abs(oklch.C-0.15) > 0.03 {
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t.Errorf("color %d: C = %f, expected ~0.15", i, oklch.C)
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}
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}
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// Hues should be evenly spaced (45° apart for 8 colors)
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for i, c := range palette {
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oklch := c.ToOKLCH()
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expectedH := float64(i) * 45.0
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diff := math.Abs(oklch.H - expectedH)
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if diff > 180 {
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diff = 360 - diff
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}
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if diff > 10.0 {
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t.Errorf("color %d: H = %f, expected ~%f", i, oklch.H, expectedH)
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}
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}
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}
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func TestGenerateOKLCHPaletteEmpty(t *testing.T) {
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palette := GenerateOKLCHPalette(0, 0.7, 0.15)
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if len(palette) != 0 {
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t.Errorf("expected empty palette, got %d colors", len(palette))
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}
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}
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func TestGenerateOKLCHPaletteSingle(t *testing.T) {
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palette := GenerateOKLCHPalette(1, 0.6, 0.1)
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if len(palette) != 1 {
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t.Fatalf("expected 1 color, got %d", len(palette))
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}
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oklch := palette[0].ToOKLCH()
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if oklch.H > 5.0 && oklch.H < 355.0 {
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t.Errorf("single color H = %f, expected ~0", oklch.H)
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}
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}
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func TestGenerateOKLCHPaletteDistinct(t *testing.T) {
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palette := GenerateOKLCHPalette(6, 0.7, 0.15)
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// All colors should be distinct
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seen := make(map[int]bool)
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for _, c := range palette {
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if seen[int(c)] {
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t.Errorf("duplicate color: %s", c.ToHex())
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}
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seen[int(c)] = true
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}
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}
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