added Demo.terrain

Author: liabru

demo/js/Demo.js

@@ -255,6 +255,50 @@
         });
     };
 
+    Demo.terrain = function() {
+        var _world = _engine.world;
+
+        Demo.reset();
+        _world.bodies = [];
+
+        var terrain;
+
+        $.get('./svg/terrain.svg').done(function(data) {
+            var vertexSets = [],
+                color = Common.choose(['#556270', '#4ECDC4', '#C7F464', '#FF6B6B', '#C44D58']);
+
+            $(data).find('path').each(function(i, path) {
+                vertexSets.push(Svg.pathToVertices(path, 30));
+            });
+
+            terrain = Bodies.fromVertices(400, 350, vertexSets, {
+                isStatic: true,
+                render: {
+                    fillStyle: color,
+                    strokeStyle: color
+                }
+            }, true);
+
+            World.add(_world, terrain);
+
+            var bodyOptions = {
+                frictionAir: 0, 
+                friction: 0.0001,
+                restitution: 0.6
+            };
+            
+            World.add(_world, Composites.stack(80, 100, 20, 20, 10, 10, function(x, y, column, row) {
+                if (Query.point([terrain], { x: x, y: y }).length === 0) {
+                    return Bodies.polygon(x, y, 5, 12, bodyOptions);
+                }
+            }));
+        });
+
+        var renderOptions = _engine.render.options;
+        renderOptions.showAngleIndicator = false;
+        renderOptions.showVelocity = true;
+    };
+
     Demo.slingshot = function() {
         var _world = _engine.world;