feat: primitive styling

client/world/drawer_test.go

@@ -103,27 +103,29 @@ func TestGGDrawerResetClipClearsClip(t *testing.T) {
 	require.True(t, pixelHasAlpha(dc.Image(), 15, 16))
 }
 
-func TestGGDrawerClearRect_ClearsPixels(t *testing.T) {
+func TestGGDrawerClearRectTo_FillsBackground(t *testing.T) {
 	t.Parallel()
 
 	dc := gg.NewContext(10, 10)
 	dr := &GGDrawer{DC: dc}
 
-	// Draw something everywhere.
+	// Draw something to ensure we overwrite non-background.
 	dr.SetFillColor(color.RGBA{R: 255, A: 255})
-	dr.ClipRect(0, 0, 10, 10)
 	dr.AddCircle(5, 5, 5)
 	dr.Fill()
-	dr.ResetClip()
 
-	// Clear a 2x2 rect at (1,1)
-	dr.ClearRect(1, 1, 2, 2)
+	bg := color.RGBA{A: 255} // black
+	dr.ClearRectTo(1, 1, 2, 2, bg)
 
 	img := dc.Image()
-	_, _, _, a := img.At(1, 1).RGBA()
-	require.Equal(t, uint32(0), a)
+	r, g, b, a := img.At(1, 1).RGBA()
 
-	// Pixel outside should remain non-zero alpha.
+	require.Equal(t, uint32(0), r)
+	require.Equal(t, uint32(0), g)
+	require.Equal(t, uint32(0), b)
+	require.Equal(t, uint32(0xffff), a)
+
+	// Pixel outside cleared rect should still have non-zero alpha.
 	_, _, _, a2 := img.At(5, 5).RGBA()
 	require.NotEqual(t, uint32(0), a2)
 }