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 +1,151 @@
+package world
+
+import (
+	"image"
+	"image/color"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+type bgOffsetScaleTheme struct {
+	img    image.Image
+	anchor BackgroundAnchorMode
+}
+
+func (t bgOffsetScaleTheme) ID() string   { return "bgoffset" }
+func (t bgOffsetScaleTheme) Name() string { return "bgoffset" }
+
+func (t bgOffsetScaleTheme) BackgroundColor() color.Color { return color.RGBA{A: 255} }
+func (t bgOffsetScaleTheme) BackgroundImage() image.Image { return t.img }
+
+func (t bgOffsetScaleTheme) BackgroundTileMode() BackgroundTileMode     { return BackgroundTileRepeat }
+func (t bgOffsetScaleTheme) BackgroundScaleMode() BackgroundScaleMode   { return BackgroundScaleNone }
+func (t bgOffsetScaleTheme) BackgroundAnchorMode() BackgroundAnchorMode { return t.anchor }
+
+func (t bgOffsetScaleTheme) PointStyle() Style {
+	return Style{FillColor: color.RGBA{A: 255}, PointRadiusPx: 2}
+}
+func (t bgOffsetScaleTheme) LineStyle() Style {
+	return Style{StrokeColor: color.RGBA{A: 255}, StrokeWidthPx: 1}
+}
+func (t bgOffsetScaleTheme) CircleStyle() Style {
+	return Style{FillColor: color.RGBA{A: 255}, StrokeColor: color.RGBA{A: 255}, StrokeWidthPx: 1}
+}
+
+func (t bgOffsetScaleTheme) PointClassOverride(PointClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+func (t bgOffsetScaleTheme) LineClassOverride(LineClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+func (t bgOffsetScaleTheme) CircleClassOverride(CircleClassID) (StyleOverride, bool) {
+	return StyleOverride{}, false
+}
+
+func TestRender_BackgroundTileRepeat_WorldAnchored_ShiftsWithPan(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(20, 20)
+	w.resetGrid(2 * SCALE)
+
+	img := image.NewRGBA(image.Rect(0, 0, 4, 4)) // tile 4x4
+	w.SetTheme(bgOffsetScaleTheme{img: img, anchor: BackgroundAnchorWorld})
+
+	params := RenderParams{
+		ViewportWidthPx:  8,
+		ViewportHeightPx: 8,
+		MarginXPx:        0,
+		MarginYPx:        0,
+		CameraXWorldFp:   5 * SCALE,
+		CameraYWorldFp:   5 * SCALE,
+		CameraZoom:       1.0,
+	}
+
+	// First render.
+	d1 := &fakePrimitiveDrawer{}
+	require.NoError(t, w.Render(d1, params))
+
+	minX1, minY1 := minDrawImageXY(t, d1)
+	require.Equal(t, -1, minX1)
+	require.Equal(t, -1, minY1)
+
+	// Pan camera by +1 world unit along both axes (zoom=1 => 1px).
+	params2 := params
+	params2.CameraXWorldFp += 1 * SCALE
+	params2.CameraYWorldFp += 1 * SCALE
+
+	// Force full redraw to make this test independent of incremental pipeline.
+	w.ForceFullRedrawNext()
+
+	d2 := &fakePrimitiveDrawer{}
+	require.NoError(t, w.Render(d2, params2))
+
+	minX2, minY2 := minDrawImageXY(t, d2)
+
+	// With world anchoring, moving camera +1 shifts the tiling origin by -1 (mod tile size).
+	require.Equal(t, -2, minX2)
+	require.Equal(t, -2, minY2)
+}
+
+func TestRender_BackgroundTileRepeat_ViewportAnchored_DoesNotShiftWithPan(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(20, 20)
+	w.resetGrid(2 * SCALE)
+
+	img := image.NewRGBA(image.Rect(0, 0, 4, 4))
+	w.SetTheme(bgOffsetScaleTheme{img: img, anchor: BackgroundAnchorViewport})
+
+	params := RenderParams{
+		ViewportWidthPx:  8,
+		ViewportHeightPx: 8,
+		MarginXPx:        0,
+		MarginYPx:        0,
+		CameraXWorldFp:   5 * SCALE,
+		CameraYWorldFp:   5 * SCALE,
+		CameraZoom:       1.0,
+	}
+
+	d1 := &fakePrimitiveDrawer{}
+	require.NoError(t, w.Render(d1, params))
+
+	minX1, minY1 := minDrawImageXY(t, d1)
+
+	params2 := params
+	params2.CameraXWorldFp += 1 * SCALE
+	params2.CameraYWorldFp += 1 * SCALE
+
+	w.ForceFullRedrawNext()
+
+	d2 := &fakePrimitiveDrawer{}
+	require.NoError(t, w.Render(d2, params2))
+
+	minX2, minY2 := minDrawImageXY(t, d2)
+
+	// With viewport anchoring, tiling origin is fixed (no camera dependency).
+	require.Equal(t, minX1, minX2)
+	require.Equal(t, minY1, minY2)
+}
+
+func minDrawImageXY(t *testing.T, d *fakePrimitiveDrawer) (int, int) {
+	t.Helper()
+
+	cmds := d.CommandsByName("DrawImage")
+	require.NotEmpty(t, cmds, "expected DrawImage calls from background tiling")
+
+	minX := int(cmds[0].Args[0])
+	minY := int(cmds[0].Args[1])
+
+	for _, c := range cmds[1:] {
+		x := int(c.Args[0])
+		y := int(c.Args[1])
+		if x < minX {
+			minX = x
+		}
+		if y < minY {
+			minY = y
+		}
+	}
+	return minX, minY
+}