added Example.constraints

demo/index.html

@@ -44,6 +44,7 @@
     <script src="../examples/compound.js"></script>
     <script src="../examples/compoundStack.js"></script>
     <script src="../examples/concave.js"></script>
+    <script src="../examples/constraints.js"></script>
     <script src="../examples/doublePendulum.js"></script>
     <script src="../examples/events.js"></script>
     <script src="../examples/friction.js"></script>

demo/js/Demo.js

@@ -118,6 +118,12 @@
                 init: Example.concave,
                 sourceLink: sourceLinkRoot + '/concave.js'
             },
+            {
+                name: 'Constraints',
+                id: 'constraints',
+                init: Example.constraints,
+                sourceLink: sourceLinkRoot + '/constraints.js'
+            },
             {
                 name: 'Double Pendulum',
                 id: 'doublePendulum',

examples/constraints.js

@@ -0,0 +1,180 @@
+var Example = Example || {};
+
+Example.constraints = function() {
+    var Engine = Matter.Engine,
+        Render = Matter.Render,
+        Runner = Matter.Runner,
+        Composites = Matter.Composites,
+        Common = Matter.Common,
+        Constraint = Matter.Constraint,
+        MouseConstraint = Matter.MouseConstraint,
+        Mouse = Matter.Mouse,
+        World = Matter.World,
+        Bodies = Matter.Bodies;
+
+    // create engine
+    var engine = Engine.create(),
+        world = engine.world;
+
+    // create renderer
+    var render = Render.create({
+        element: document.body,
+        engine: engine,
+        options: {
+            width: Math.min(document.documentElement.clientWidth, 800),
+            height: Math.min(document.documentElement.clientHeight, 600),
+            showAngleIndicator: true
+        }
+    });
+
+    Render.run(render);
+
+    // create runner
+    var runner = Runner.create();
+    Runner.run(runner, engine);
+
+    // add stiff global constraint
+    var body = Bodies.polygon(150, 200, 5, 30);
+
+    var constraint = Constraint.create({
+        pointA: { x: 150, y: 100 },
+        bodyB: body,
+        pointB: { x: -10, y: -10 }
+    });
+
+    World.add(world, [body, constraint]);
+
+    // add soft global constraint
+    var body = Bodies.polygon(280, 100, 3, 30);
+
+    var constraint = Constraint.create({
+        pointA: { x: 280, y: 120 },
+        bodyB: body,
+        pointB: { x: -10, y: -7 },
+        stiffness: 0.001
+    });
+
+    World.add(world, [body, constraint]);
+
+    // add damped soft global constraint
+    var body = Bodies.polygon(400, 100, 4, 30);
+
+    var constraint = Constraint.create({
+        pointA: { x: 400, y: 120 },
+        bodyB: body,
+        pointB: { x: -10, y: -10 },
+        stiffness: 0.001,
+        damping: 0.05
+    });
+
+    World.add(world, [body, constraint]);
+
+    // add revolute constraint
+    var body = Bodies.rectangle(600, 200, 200, 20);
+    var ball = Bodies.circle(550, 150, 20);
+
+    var constraint = Constraint.create({
+        pointA: { x: 600, y: 200 },
+        bodyB: body,
+        length: 0
+    });
+
+    World.add(world, [body, ball, constraint]);
+
+    // add revolute multi-body constraint
+    var body = Bodies.rectangle(500, 400, 100, 20, { collisionFilter: { group: -1 } });
+    var ball = Bodies.circle(600, 400, 20, { collisionFilter: { group: -1 } });
+
+    var constraint = Constraint.create({
+        bodyA: body,
+        bodyB: ball
+    });
+
+    World.add(world, [body, ball, constraint]);
+
+    // add stiff multi-body constraint
+    var bodyA = Bodies.polygon(100, 400, 6, 20);
+    var bodyB = Bodies.polygon(200, 400, 1, 50);
+
+    var constraint = Constraint.create({
+        bodyA: bodyA,
+        pointA: { x: -10, y: -10 },
+        bodyB: bodyB,
+        pointB: { x: -10, y: -10 }
+    });
+
+    World.add(world, [bodyA, bodyB, constraint]);
+
+    // add soft global constraint
+    var bodyA = Bodies.polygon(300, 400, 4, 20);
+    var bodyB = Bodies.polygon(400, 400, 3, 30);
+
+    var constraint = Constraint.create({
+        bodyA: bodyA,
+        pointA: { x: -10, y: -10 },
+        bodyB: bodyB,
+        pointB: { x: -10, y: -7 },
+        stiffness: 0.001
+    });
+
+    World.add(world, [bodyA, bodyB, constraint]);
+
+    // add damped soft global constraint
+    var bodyA = Bodies.polygon(500, 400, 6, 30);
+    var bodyB = Bodies.polygon(600, 400, 7, 60);
+
+    var constraint = Constraint.create({
+        bodyA: bodyA,
+        pointA: { x: -10, y: -10 },
+        bodyB: bodyB,
+        pointB: { x: -10, y: -10 },
+        stiffness: 0.001,
+        damping: 0.1
+    });
+
+    World.add(world, [bodyA, bodyB, constraint]);
+
+    World.add(world, [
+        // walls
+        Bodies.rectangle(400, 0, 800, 50, { isStatic: true }),
+        Bodies.rectangle(400, 600, 800, 50, { isStatic: true }),
+        Bodies.rectangle(800, 300, 50, 600, { isStatic: true }),
+        Bodies.rectangle(0, 300, 50, 600, { isStatic: true })
+    ]);
+
+    // add mouse control
+    var mouse = Mouse.create(render.canvas),
+        mouseConstraint = MouseConstraint.create(engine, {
+            mouse: mouse,
+            constraint: {
+                // allow bodies on mouse to rotate
+                angularStiffness: 0,
+                render: {
+                    visible: false
+                }
+            }
+        });
+
+    World.add(world, mouseConstraint);
+
+    // keep the mouse in sync with rendering
+    render.mouse = mouse;
+
+    // fit the render viewport to the scene
+    Render.lookAt(render, {
+        min: { x: 0, y: 0 },
+        max: { x: 800, y: 600 }
+    });
+
+    // context for MatterTools.Demo
+    return {
+        engine: engine,
+        runner: runner,
+        render: render,
+        canvas: render.canvas,
+        stop: function() {
+            Matter.Render.stop(render);
+            Matter.Runner.stop(runner);
+        }
+    };
+};