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 +1,144 @@
+package world
+
+import (
+	"image"
+	"image/color"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+type testTheme struct{}
+
+func (testTheme) ID() string   { return "t1" }
+func (testTheme) Name() string { return "Theme1" }
+
+func (testTheme) BackgroundColor() color.Color { return color.RGBA{R: 1, G: 2, B: 3, A: 255} }
+func (testTheme) BackgroundImage() image.Image { return nil }
+
+func (testTheme) BackgroundTileMode() BackgroundTileMode     { return BackgroundTileRepeat }
+func (testTheme) BackgroundScaleMode() BackgroundScaleMode   { return BackgroundScaleNone }
+func (testTheme) BackgroundAnchorMode() BackgroundAnchorMode { return BackgroundAnchorWorld }
+func (testTheme) PointClassOverride(PointClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+func (testTheme) LineClassOverride(LineClassID) (StyleOverride, bool) { return StyleOverride{}, false }
+func (testTheme) CircleClassOverride(CircleClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+
+func (testTheme) PointStyle() Style {
+	return Style{
+		FillColor:        color.RGBA{R: 9, A: 255},
+		StrokeColor:      nil,
+		StrokeWidthPx:    0,
+		StrokeDashes:     nil,
+		StrokeDashOffset: 0,
+		PointRadiusPx:    4,
+	}
+}
+func (testTheme) LineStyle() Style {
+	return Style{
+		FillColor:        nil,
+		StrokeColor:      color.RGBA{G: 9, A: 255},
+		StrokeWidthPx:    3,
+		StrokeDashes:     []float64{2, 2},
+		StrokeDashOffset: 1,
+		PointRadiusPx:    0,
+	}
+}
+func (testTheme) CircleStyle() Style {
+	return Style{
+		FillColor:        color.RGBA{B: 9, A: 255},
+		StrokeColor:      color.RGBA{A: 255},
+		StrokeWidthPx:    2,
+		StrokeDashes:     nil,
+		StrokeDashOffset: 0,
+		PointRadiusPx:    0,
+	}
+}
+
+func TestWorldSetTheme_MaterializesThemeDefaultStyles(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(10, 10)
+
+	// Built-ins should remain stable (1/2/3).
+	require.Equal(t, StyleIDDefaultLine, StyleID(1))
+	require.Equal(t, StyleIDDefaultCircle, StyleID(2))
+	require.Equal(t, StyleIDDefaultPoint, StyleID(3))
+
+	// Set a custom theme.
+	w.SetTheme(testTheme{})
+
+	// Theme defaults should NOT be built-in IDs anymore.
+	require.NotEqual(t, StyleIDDefaultLine, w.themeDefaultLineStyleID)
+	require.NotEqual(t, StyleIDDefaultCircle, w.themeDefaultCircleStyleID)
+	require.NotEqual(t, StyleIDDefaultPoint, w.themeDefaultPointStyleID)
+
+	ls, ok := w.styles.Get(w.themeDefaultLineStyleID)
+	require.True(t, ok)
+	require.Equal(t, 3.0, ls.StrokeWidthPx)
+	require.Equal(t, []float64{2, 2}, ls.StrokeDashes)
+	require.Equal(t, 1.0, ls.StrokeDashOffset)
+
+	cs, ok := w.styles.Get(w.themeDefaultCircleStyleID)
+	require.True(t, ok)
+	require.Equal(t, 2.0, cs.StrokeWidthPx)
+
+	ps, ok := w.styles.Get(w.themeDefaultPointStyleID)
+	require.True(t, ok)
+	require.Equal(t, 4.0, ps.PointRadiusPx)
+}
+
+func TestRender_UsesThemeBackgroundColor_WhenNoOptionOverride(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(10, 10)
+	w.SetTheme(testTheme{})
+
+	// Minimal index.
+	w.resetGrid(2 * SCALE)
+
+	params := RenderParams{
+		ViewportWidthPx:  10,
+		ViewportHeightPx: 10,
+		MarginXPx:        0,
+		MarginYPx:        0,
+		CameraXWorldFp:   5 * SCALE,
+		CameraYWorldFp:   5 * SCALE,
+		CameraZoom:       1.0,
+	}
+
+	d := &fakePrimitiveDrawer{}
+	require.NoError(t, w.Render(d, params))
+
+	// Should clear with theme background color via ClearAllTo(bg).
+	require.NotEmpty(t, d.CommandsByName("ClearAllTo"))
+}
+
+func TestRender_OptionsBackgroundColor_OverridesThemeBackgroundColor(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(10, 10)
+	w.SetTheme(testTheme{})
+
+	w.resetGrid(2 * SCALE)
+
+	params := RenderParams{
+		ViewportWidthPx:  10,
+		ViewportHeightPx: 10,
+		MarginXPx:        0,
+		MarginYPx:        0,
+		CameraXWorldFp:   5 * SCALE,
+		CameraYWorldFp:   5 * SCALE,
+		CameraZoom:       1.0,
+		Options: &RenderOptions{
+			BackgroundColor: color.RGBA{R: 200, A: 255},
+		},
+	}
+
+	d := &fakePrimitiveDrawer{}
+	require.NoError(t, w.Render(d, params))
+	require.NotEmpty(t, d.CommandsByName("ClearAllTo"))
+}