feat: primitive styling

client/world/render_priority_test.go

@@ -0,0 +1,67 @@
+package world
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestRender_SortsByPriorityWithinTile(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(10, 10)
+	w.resetGrid(2 * SCALE)
+
+	// Same tile. Priorities deliberately mixed.
+	_, err := w.AddCircle(5, 5, 1, CircleWithPriority(500))
+	require.NoError(t, err)
+
+	_, err = w.AddLine(1, 5, 9, 5, LineWithPriority(100))
+	require.NoError(t, err)
+
+	_, err = w.AddPoint(5, 6, PointWithPriority(300))
+	require.NoError(t, err)
+
+	for _, obj := range w.objects {
+		w.indexObject(obj)
+	}
+
+	params := RenderParams{
+		ViewportWidthPx:  10,
+		ViewportHeightPx: 10,
+		MarginXPx:        0,
+		MarginYPx:        0,
+		CameraXWorldFp:   5 * SCALE,
+		CameraYWorldFp:   5 * SCALE,
+		CameraZoom:       1.0,
+		Options:          &RenderOptions{
+			// default: wrap on
+		},
+	}
+
+	d := &fakePrimitiveDrawer{}
+	require.NoError(t, w.Render(d, params))
+
+	// We verify the first occurrence of each primitive kind follows priority order.
+	// Since each object is drawn with Add* + Fill/Stroke immediately, order should match.
+	cmds := d.Commands()
+	firstLine := indexOfFirst(cmds, "AddLine")
+	firstCircle := indexOfFirst(cmds, "AddCircle")
+	firstPoint := indexOfFirst(cmds, "AddPoint")
+
+	require.NotEqual(t, -1, firstLine)
+	require.NotEqual(t, -1, firstCircle)
+	require.NotEqual(t, -1, firstPoint)
+
+	require.Less(t, firstLine, firstPoint)
+	require.Less(t, firstPoint, firstCircle) // 300 before 500
+}
+
+func indexOfFirst(cmds []fakeDrawerCommand, name string) int {
+	for i, c := range cmds {
+		if c.Name == name {
+			return i
+		}
+	}
+	return -1
+}