added Composite.bounds

src/body/Composite.js

@@ -532,6 +532,24 @@ var Body = require('./Body');
         return composite;
     };
 
+    /**
+     * Returns the union of the bounds of all of the composite's bodies.
+     * @method bounds
+     * @param {composite} composite The composite.
+     * @returns {bounds} The composite bounds.
+     */
+    Composite.bounds = function(composite) {
+      var bodies = Matter.Composite.allBodies(composite),
+          vertices = [];
+      
+      for (var i = 0; i < bodies.length; i += 1) {
+        var body = bodies[i];
+        vertices.push(body.bounds.min, body.bounds.max);
+      }
+
+      return Matter.Bounds.create(vertices);
+    };
+
     /*
     *
     *  Events Documentation