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liabru-matter-js/examples/staticFriction.js

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JavaScript

(function() {
var World = Matter.World,
Bodies = Matter.Bodies,
Body = Matter.Body,
Composites = Matter.Composites,
Events = Matter.Events;
Example.staticFriction = function(demo) {
var engine = demo.engine,
world = engine.world,
sceneEvents = demo.sceneEvents;
var body = Bodies.rectangle(400, 500, 200, 60, { isStatic: true, chamfer: 10 }),
size = 50,
counter = -1;
var stack = Composites.stack(350, 470 - 6 * size, 1, 6, 0, 0, function(x, y) {
return Bodies.rectangle(x, y, size * 2, size, {
slop: 0.5,
friction: 1,
frictionStatic: Infinity
});
});
World.add(world, [body, stack]);
sceneEvents.push(
Events.on(engine, 'beforeUpdate', function(event) {
counter += 0.014;
if (counter < 0) {
return;
}
var px = 400 + 100 * Math.sin(counter);
// body is static so must manually update velocity for friction to work
Body.setVelocity(body, { x: px - body.position.x, y: 0 });
Body.setPosition(body, { x: px, y: body.position.y });
})
);
var renderOptions = demo.render.options;
renderOptions.showAngleIndicator = false;
renderOptions.showVelocity = true;
};
})();