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andrewn/script.js

Created April 18, 2018 12:24
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  1. andrewn created this gist Apr 18, 2018.
    141 changes: 141 additions & 0 deletions script.js
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    var Engine = Matter.Engine,
    Render = Matter.Render,
    Runner = Matter.Runner,
    Events = Matter.Events,
    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: 800,
    height: 600,
    wireframes: false,
    background: '#111'
    }
    });

    Render.run(render);

    // create runner
    var runner = Runner.create();
    Runner.run(runner, engine);

    // add bodies
    var redColor = '#C44D58',
    greenColor = '#C7F464';

    var collider = (num = 0) => {
    const w = 50;
    const h = 50;
    const x = (num * w) + (50/2);
    const y = 575;

    return Bodies.rectangle(x, y, w, h, {
    isSensor: true,
    isStatic: true,
    render: {
    strokeStyle: 'blue',
    fillStyle: 'transparent',
    lineWidth: 1
    }
    });
    }

    const colliders = _.range(0, 800/50).map(collider);

    World.add(world, [
    ...colliders,
    Bodies.rectangle(400, 620, 800, 50, {
    isStatic: true,
    render: {
    fillStyle: 'transparent',
    lineWidth: 1
    }
    })
    ]);

    const droplet = () => (
    World.add(world,
    Bodies.circle(400, 40, 10, {
    render: {
    strokeStyle: greenColor,
    fillStyle: 'transparent',
    lineWidth: 1
    }
    })
    )
    );

    window.setInterval(droplet, 2000)

    Events.on(engine, 'collisionStart', function(event) {
    var pairs = event.pairs;

    for (var i = 0, j = pairs.length; i != j; ++i) {
    var pair = pairs[i];

    if (colliders.includes(pair.bodyA)) {
    pair.bodyA.render.strokeStyle = redColor;
    } else if (colliders.includes(pair.bodyB)) {
    pair.bodyB.render.strokeStyle = redColor;
    }

    // if (colliders.includes(pair.bodyA)) {
    // pair.bodyB.render.strokeStyle = redColor;
    // } else if (colliders.includes(pair.bodyB)) {
    // pair.bodyA.render.strokeStyle = redColor;
    // }
    }
    });

    Events.on(engine, 'collisionEnd', function(event) {
    var pairs = event.pairs;

    for (var i = 0, j = pairs.length; i != j; ++i) {
    var pair = pairs[i];

    if (colliders.includes(pair.bodyA)) {
    pair.bodyA.render.strokeStyle = 'blue';
    } else if (colliders.includes(pair.bodyB)) {
    pair.bodyB.render.strokeStyle = 'blue';
    }

    // if (pair.bodyA === collider) {
    // pair.bodyB.render.strokeStyle = greenColor;
    // } else if (pair.bodyB === collider) {
    // pair.bodyA.render.strokeStyle = greenColor;
    // }
    }
    });

    // add mouse control
    var mouse = Mouse.create(render.canvas),
    mouseConstraint = MouseConstraint.create(engine, {
    mouse: mouse,
    constraint: {
    stiffness: 0.2,
    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 }
    });
    2 changes: 2 additions & 0 deletions scripts
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    <script src="https://unpkg.com/[email protected]/build/matter.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.js"></script>
    7 changes: 7 additions & 0 deletions wjvexp.markdown
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    wjvexp
    ------


    A [Pen](https://codepen.io/andrewnicolaou/pen/wjvexp) by [Nicolaou](https://codepen.io/andrewnicolaou) on [CodePen](https://codepen.io).

    [License](https://codepen.io/andrewnicolaou/pen/wjvexp/license).