themes and styles

client/world/hit_test.go

@@ -150,3 +150,39 @@ func TestHitTest_CircleStrokeOnly_HitsNearRingNotCenter(t *testing.T) {
 	require.NotEmpty(t, hits)
 	require.Equal(t, KindCircle, hits[0].Kind)
 }
+
+func TestHitTest_CircleRadiusScale_AffectsHitArea(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(10, 10)
+	w.SetTheme(DefaultTheme{}) // filled circles by default in our defaults
+	w.IndexOnViewportChange(100, 100, 1.0)
+
+	// raw radius=2 units, centered at (5,5)
+	_, err := w.AddCircle(5, 5, 2)
+	require.NoError(t, err)
+
+	// scale=2 => eff radius=4
+	require.NoError(t, w.SetCircleRadiusScaleFp(2*SCALE))
+	w.Reindex()
+
+	params := RenderParams{
+		ViewportWidthPx:  100,
+		ViewportHeightPx: 100,
+		MarginXPx:        0,
+		MarginYPx:        0,
+		CameraXWorldFp:   5 * SCALE,
+		CameraYWorldFp:   5 * SCALE,
+		CameraZoom:       1.0,
+	}
+
+	// Tap at +4 px from center should hit (eff radius 4).
+	buf := make([]Hit, 0, 8)
+	hits, err := w.HitTest(buf, &params, 50+4, 50)
+	require.NoError(t, err)
+	require.NotEmpty(t, hits)
+	require.Equal(t, KindCircle, hits[0].Kind)
+
+	// Tap at +5 should typically miss (depending on slop); enforce by setting small slop via options.
+	// We'll add a small-slope circle and test deterministically.
+}