themes and styles

client/world/renderer_theme_hotswap_test.go

@@ -0,0 +1,90 @@
+package world
+
+import (
+	"image"
+	"image/color"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+type pointRadiusTheme struct {
+	id     string
+	radius float64
+}
+
+func (t pointRadiusTheme) ID() string   { return t.id }
+func (t pointRadiusTheme) Name() string { return t.id }
+
+func (t pointRadiusTheme) BackgroundColor() color.Color { return color.RGBA{A: 255} }
+func (t pointRadiusTheme) BackgroundImage() image.Image { return nil }
+
+func (t pointRadiusTheme) BackgroundTileMode() BackgroundTileMode     { return BackgroundTileNone }
+func (t pointRadiusTheme) BackgroundScaleMode() BackgroundScaleMode   { return BackgroundScaleNone }
+func (t pointRadiusTheme) BackgroundAnchorMode() BackgroundAnchorMode { return BackgroundAnchorWorld }
+
+func (t pointRadiusTheme) PointStyle() Style {
+	return Style{FillColor: color.RGBA{A: 255}, PointRadiusPx: t.radius}
+}
+func (t pointRadiusTheme) LineStyle() Style {
+	return Style{StrokeColor: color.RGBA{A: 255}, StrokeWidthPx: 1}
+}
+func (t pointRadiusTheme) CircleStyle() Style {
+	return Style{FillColor: color.RGBA{A: 255}, StrokeColor: color.RGBA{A: 255}, StrokeWidthPx: 1}
+}
+
+func (t pointRadiusTheme) PointClassOverride(PointClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+func (t pointRadiusTheme) LineClassOverride(LineClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+func (t pointRadiusTheme) CircleClassOverride(CircleClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+
+func TestRender_ThemeChange_AppliesWithoutReindex_UsesLatestObjectStyles(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(10, 10)
+
+	// Build index once.
+	w.IndexOnViewportChange(100, 100, 1.0)
+
+	// Theme A: point radius 2
+	w.SetTheme(pointRadiusTheme{id: "A", radius: 2})
+
+	_, err := w.AddPoint(5, 5)
+	require.NoError(t, err)
+
+	// Ensure the point is actually present in grid (it will be, because Add triggers rebuild via index state).
+	// Render once.
+	params := RenderParams{
+		ViewportWidthPx:  100,
+		ViewportHeightPx: 100,
+		MarginXPx:        0,
+		MarginYPx:        0,
+		CameraXWorldFp:   5 * SCALE,
+		CameraYWorldFp:   5 * SCALE,
+		CameraZoom:       1.0,
+	}
+
+	d1 := &fakePrimitiveDrawer{}
+	require.NoError(t, w.Render(d1, params))
+
+	p1 := d1.CommandsByName("AddPoint")
+	require.NotEmpty(t, p1)
+	r1 := p1[0].Args[2]
+	require.Equal(t, 2.0, r1)
+
+	// Theme B: point radius 7. Change theme, but DO NOT reindex.
+	w.SetTheme(pointRadiusTheme{id: "B", radius: 7})
+
+	d2 := &fakePrimitiveDrawer{}
+	require.NoError(t, w.Render(d2, params))
+
+	p2 := d2.CommandsByName("AddPoint")
+	require.NotEmpty(t, p2)
+	r2 := p2[0].Args[2]
+	require.Equal(t, 7.0, r2)
+}