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 +1,122 @@
+package world
+
+import (
+	"image"
+	"image/color"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+type bgTheme struct {
+	img image.Image
+}
+
+func (t bgTheme) ID() string   { return "bg" }
+func (t bgTheme) Name() string { return "bg" }
+
+func (t bgTheme) BackgroundColor() color.Color { return color.RGBA{A: 255} }
+func (t bgTheme) BackgroundImage() image.Image { return t.img }
+
+func (t bgTheme) BackgroundTileMode() BackgroundTileMode     { return BackgroundTileRepeat }
+func (t bgTheme) BackgroundScaleMode() BackgroundScaleMode   { return BackgroundScaleNone }
+func (t bgTheme) BackgroundAnchorMode() BackgroundAnchorMode { return BackgroundAnchorViewport }
+
+func (t bgTheme) PointStyle() Style { return Style{FillColor: color.RGBA{A: 255}, PointRadiusPx: 2} }
+func (t bgTheme) LineStyle() Style  { return Style{StrokeColor: color.RGBA{A: 255}, StrokeWidthPx: 1} }
+func (t bgTheme) CircleStyle() Style {
+	return Style{FillColor: color.RGBA{A: 255}, StrokeColor: color.RGBA{A: 255}, StrokeWidthPx: 1}
+}
+
+func (t bgTheme) PointClassOverride(PointClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+func (t bgTheme) LineClassOverride(LineClassID) (StyleOverride, bool) { return StyleOverride{}, false }
+func (t bgTheme) CircleClassOverride(CircleClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+
+func TestRender_BackgroundImage_DrawsBeforePrimitives_FullRedraw(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(10, 10)
+	w.resetGrid(2 * SCALE)
+
+	// 4x4 opaque image
+	img := image.NewRGBA(image.Rect(0, 0, 4, 4))
+	w.SetTheme(bgTheme{img: img})
+
+	_, err := w.AddPoint(5, 5)
+	require.NoError(t, err)
+	for _, obj := range w.objects {
+		w.indexObject(obj)
+	}
+
+	params := RenderParams{
+		ViewportWidthPx:  10,
+		ViewportHeightPx: 10,
+		MarginXPx:        2,
+		MarginYPx:        2,
+		CameraXWorldFp:   5 * SCALE,
+		CameraYWorldFp:   5 * SCALE,
+		CameraZoom:       1.0,
+	}
+
+	d := &fakePrimitiveDrawer{}
+	require.NoError(t, w.Render(d, params))
+
+	cmds := d.Commands()
+	iClear := indexOfFirstName(cmds, "ClearAllTo")
+	iBg := indexOfFirstName(cmds, "DrawImage")
+	iPrim := indexOfFirstName(cmds, "AddPoint")
+
+	require.NotEqual(t, -1, iClear)
+	require.NotEqual(t, -1, iBg)
+	require.NotEqual(t, -1, iPrim)
+	require.Less(t, iClear, iBg)
+	require.Less(t, iBg, iPrim)
+}
+
+func TestRender_BackgroundImage_RedrawnInDirtyRects_OnIncrementalShift(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(10, 10)
+	w.resetGrid(2 * SCALE)
+
+	img := image.NewRGBA(image.Rect(0, 0, 4, 4))
+	w.SetTheme(bgTheme{img: img})
+
+	// Ensure state: first full render commits.
+	params := RenderParams{
+		ViewportWidthPx:  10,
+		ViewportHeightPx: 10,
+		MarginXPx:        2,
+		MarginYPx:        2,
+		CameraXWorldFp:   5 * SCALE,
+		CameraYWorldFp:   5 * SCALE,
+		CameraZoom:       1.0,
+		Options: &RenderOptions{
+			Incremental: &IncrementalPolicy{
+				AllowShiftOnly:   false,
+				MaxCatchUpAreaPx: 0,
+				RenderBudgetMs:   0,
+				CoalesceUpdates:  false,
+			},
+		},
+	}
+
+	d := &fakePrimitiveDrawer{}
+	require.NoError(t, w.Render(d, params))
+
+	// Move camera by 1px right in world (zoom=1 => 1px == 1 unit).
+	params2 := params
+	params2.CameraXWorldFp += 1 * SCALE
+
+	d2 := &fakePrimitiveDrawer{}
+	require.NoError(t, w.Render(d2, params2))
+
+	// In incremental shift path we must see ClearRectTo and DrawImage.
+	require.NotEmpty(t, d2.CommandsByName("CopyShift"))
+	require.NotEmpty(t, d2.CommandsByName("ClearRectTo"))
+	require.NotEmpty(t, d2.CommandsByName("DrawImage"))
+}