diff --git a/demo/index.html b/demo/index.html
index e248179..dd2eb04 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -44,6 +44,7 @@
+
diff --git a/demo/js/Demo.js b/demo/js/Demo.js
index 4a7a498..a0dea63 100644
--- a/demo/js/Demo.js
+++ b/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',
diff --git a/examples/constraints.js b/examples/constraints.js
new file mode 100644
index 0000000..5db0161
--- /dev/null
+++ b/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);
+ }
+ };
+};
\ No newline at end of file