added compound support to Query.ray

Author: liabru

demo/js/Demo.js

@@ -1285,8 +1285,11 @@
                 return Bodies.polygon(x, y, sides, Common.random(20, 50));
             }
         });
+
+        var vertices = Matter.Vertices.fromPath('164 171,232 233,213 302,273 241,342 305,316 231,364 170,309 188,281 117,240 182'),
+            concave = Bodies.fromVertices(200, 200, vertices);
 
-        World.add(_world, stack);
+        World.add(_world, [stack, concave]);
 
         _sceneEvents.push(
             Events.on(_engine, 'afterRender', function() {

src/collision/Query.js

@@ -29,12 +29,19 @@ var Query = {};
 
         for (var i = 0; i < bodies.length; i++) {
             var bodyA = bodies[i];
-
+            
             if (Bounds.overlaps(bodyA.bounds, ray.bounds)) {
-                var collision = SAT.collides(bodyA, ray);
-                if (collision.collided) {
-                    collision.body = collision.bodyA = collision.bodyB = bodyA;
-                    collisions.push(collision);
+                for (var j = bodyA.parts.length === 1 ? 0 : 1; j < bodyA.parts.length; j++) {
+                    var part = bodyA.parts[j];
+
+                    if (Bounds.overlaps(part.bounds, ray.bounds)) {
+                        var collision = SAT.collides(part, ray);
+                        if (collision.collided) {
+                            collision.body = collision.bodyA = collision.bodyB = bodyA;
+                            collisions.push(collision);
+                            break;
+                        }
+                    }
                 }
             }
         }