themes and styles

2026-03-08 15:31:17 +02:00
parent e37a67bc99
commit 1c2fc30127
39 changed files with 2693 additions and 199 deletions
@@ -0,0 +1,84 @@
+package world
+
+import (
+	"image"
+	"image/color"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+type cacheTheme struct{}
+
+func (cacheTheme) ID() string                                 { return "cache" }
+func (cacheTheme) Name() string                               { return "cache" }
+func (cacheTheme) BackgroundColor() color.Color               { return color.RGBA{A: 255} }
+func (cacheTheme) BackgroundImage() image.Image               { return nil }
+func (cacheTheme) BackgroundTileMode() BackgroundTileMode     { return BackgroundTileNone }
+func (cacheTheme) BackgroundScaleMode() BackgroundScaleMode   { return BackgroundScaleNone }
+func (cacheTheme) BackgroundAnchorMode() BackgroundAnchorMode { return BackgroundAnchorWorld }
+func (cacheTheme) PointStyle() Style                          { return Style{FillColor: color.RGBA{A: 255}, PointRadiusPx: 2} }
+func (cacheTheme) LineStyle() Style                           { return Style{StrokeColor: color.RGBA{A: 255}, StrokeWidthPx: 1} }
+func (cacheTheme) CircleStyle() Style {
+	return Style{FillColor: color.RGBA{A: 255}, StrokeColor: color.RGBA{A: 255}, StrokeWidthPx: 1}
+}
+func (cacheTheme) PointClassOverride(PointClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+func (cacheTheme) LineClassOverride(LineClassID) (StyleOverride, bool) { return StyleOverride{}, false }
+func (cacheTheme) CircleClassOverride(CircleClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+
+type cacheTheme2 struct{ cacheTheme }
+
+func (cacheTheme2) ID() string   { return "cache2" }
+func (cacheTheme2) Name() string { return "cache2" }
+func (cacheTheme2) CircleStyle() Style {
+	return Style{FillColor: color.RGBA{B: 200, A: 255}, StrokeColor: color.RGBA{A: 255}, StrokeWidthPx: 3}
+}
+func (cacheTheme2) PointClassOverride(PointClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+func (cacheTheme2) LineClassOverride(LineClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+func (cacheTheme2) CircleClassOverride(CircleClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+
+func TestDerivedStyleCache_ReusesDerivedStylesAcrossObjectsAndThemes(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(10, 10)
+	w.SetTheme(cacheTheme{})
+
+	before := w.styles.Count()
+
+	white := color.RGBA{R: 255, G: 255, B: 255, A: 255}
+	ov := StyleOverride{StrokeColor: white}
+
+	id1, err := w.AddCircle(5, 5, 2, CircleWithStyleOverride(ov))
+	require.NoError(t, err)
+	id2, err := w.AddCircle(6, 5, 2, CircleWithStyleOverride(ov))
+	require.NoError(t, err)
+
+	c1 := w.objects[id1].(Circle)
+	c2 := w.objects[id2].(Circle)
+	require.Equal(t, c1.StyleID, c2.StyleID, "same override must reuse derived style ID")
+
+	afterAdd := w.styles.Count()
+	require.Equal(t, before+1, afterAdd, "only one derived style should be added for identical overrides")
+
+	// Change theme: derived cache is cleared and new base IDs are created; override must still be applied,
+	// and both objects should again share one derived style for the new base.
+	w.SetTheme(cacheTheme2{})
+
+	c1b := w.objects[id1].(Circle)
+	c2b := w.objects[id2].(Circle)
+	require.Equal(t, c1b.StyleID, c2b.StyleID)
+
+	afterTheme := w.styles.Count()
+	// Theme change creates 3 new theme default styles + 1 new derived for the override.
+	require.GreaterOrEqual(t, afterTheme, afterAdd+4)
+}