[nacltoons] Add compound shapes.

nacltoons/data/res/sample_game/level1.def

Index: nacltoons/data/res/sample_game/level1.def
diff --git a/nacltoons/data/res/sample_game/level1.def b/nacltoons/data/res/sample_game/level1.def
index cdc12352c5ddaa10113f591f549a4ff1d5f2a51e..2a99ca89bd98fb9fe8a8098a2145d84468196411 100644
--- a/nacltoons/data/res/sample_game/level1.def
+++ b/nacltoons/data/res/sample_game/level1.def
@@ -12,6 +12,7 @@ sprites:
   - { pos: [ 200, 480 ], image: star_image, tag: STAR1, sensor: true }
   - { pos: [ 200, 240 ], image: star_image, tag: STAR2, sensor: true }
   - { pos: [ 420, 90  ], image: star_image, tag: STAR3, sensor: true }
+  - { pos: [ 550, 250  ], image: star_image, sensor: true }
 
 shapes:
   # create three ramps for the ball to roll down
@@ -21,11 +22,15 @@ shapes:
 
   - { type: line, color: [ 0, 50, 230 ], start: [ 20, 240 ], finish: [ 200, 50  ] }
 
-  # create a box
-  - { type: line, start: [ 500, 200 ], finish: [ 500, 300 ] }
-  - { type: line, start: [ 500, 300 ], finish: [ 600, 300 ] }
-  - { type: line, start: [ 600, 300 ], finish: [ 600, 200 ] }
-  - { type: line, start: [ 600, 200 ], finish: [ 500, 200 ] }
+  # Create a box made of 4 lines.
+  - { type: compound, pos: [ 500, 200 ],
+      children: [
+        { type: line, start: [   0,   0 ], finish: [   0, 100 ] },
+        { type: line, start: [   0, 100 ], finish: [ 100, 100 ] },
+        { type: line, start: [ 100, 100 ], finish: [ 100,   0 ] },
+        { type: line, start: [ 100,   0 ], finish: [   0,   0 ] },
+      ]
+    }
 
   # create a dynamic line anchored to the world at a fixed point.
   - { type: line, start: [ 220, 50 ], finish: [ 620, 50 ], dynamic: true, anchor: [ 420, 50 ] }