bblocks/star.html at main · TwoBar/bblocks · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="matter.js"></script>
    <script src="matter-attractors.js"></script>

</head>
<body onmousedown="gravity()">
<script>
    Matter.use(
  'matter-attractors' // PLUGIN_NAME
);

    var Engine = Matter.Engine,
        Render = Matter.Render,
        Runner = Matter.Runner,
        Events = Matter.Events,
        Composites = Matter.Composites,
        Common = Matter.Common,
        MouseConstraint = Matter.MouseConstraint,
        Mouse = Matter.Mouse,
        Composite = Matter.Composite,
        Vector = Matter.Vector,
        Bounds = Matter.Bounds,
        Bodies = Matter.Bodies,
        World = Matter.World;

    // create engine
    var engine = Engine.create(),
        worldi = engine.world;


var render = Render.create({
    element: document.body,
    engine: engine,
    options: {
      wireframes: false,
      background: "rgb(0,0,0)"
}});
render.canvas.width = window.innerWidth;
render.canvas.height = window.innerHeight;


  // create runner
var runner = Runner.create();

Runner.run(runner, engine);
Render.run(render);

 var world = engine.world;
  world.gravity.scale = 0;
// create an engine

    // add mouse control
    var mouse = Mouse.create(render.canvas),
        mouseConstraint = MouseConstraint.create(engine, {
            mouse: mouse,
            constraint: {
                stiffness: 0.2,
                render: {
                    visible: false
                }
            }
        });

    Composite.add(world, mouseConstraint);

    // keep the mouse in sync with rendering
    render.mouse = mouse;

    document.onmousemove = function(event) {
    pointerX = event.pageX;
	pointerY = event.pageY;
}

    // add bodies
var boxC = Bodies.circle(window.innerWidth/2, window.innerHeight/2, 1, { isStatic: true,  plugin: {
      attractors: [
        function(bodyA, bodyB) {
          return {
            x: (bodyA.position.x - bodyB.position.x) * 1e-7,
            y: (bodyA.position.y - bodyB.position.y) * 1e-7,
          };
        }
      ]
    }});

World.add(world, boxC);
var ground = Bodies.rectangle(window.innerWidth/2, window.innerHeight, window.innerWidth, 60, { isStatic: true  });
for (var i = 0; i < 150; i += 1) {
  var body = Bodies.polygon(
    Common.random(0, render.canvas.width),
    Common.random(0, render.options.height),
    Common.random(1, 5),
    Common.random() > 0.9 ? Common.random(15, 25) : Common.random(5, 10)
  );

//  World.add(world, body);
}

// add all of the bodies to the world
function gravity()  {
  var boxA = Bodies.rectangle(pointerX , pointerY , 30, Common.random(5, 20), { render: {fillStyle: "rgb("+Common.random(100, 200)+","+Common.random(50, 200)+","+Common.random(150, 250)+")" }});
  World.add(world, boxA)
}

    // get the centre of the viewport
    var viewportCentre = {
        x: render.options.width * 0.5,
        y: render.options.height * 0.5
    };

    // create limits for the viewport
    var extents = {
        min: { x: -300, y: -300 },
        max: { x: 1100, y: 900 }
    };

    // keep track of current bounds scale (view zoom)
    var boundsScaleTarget = 1,
        boundsScale = {
            x: 1,
            y: 1
        };

    // use a render event to control our view
    Events.on(render, 'beforeRender', function() {
        var worldi = engine.world,
            mouse = mouseConstraint.mouse,
            translate;

        // mouse wheel controls zoom
        var scaleFactor = mouse.wheelDelta * -0.1;
        if (scaleFactor !== 0) {
            if ((scaleFactor < 0 && boundsScale.x >= 0.6) || (scaleFactor > 0 && boundsScale.x <= 1.4)) {
                boundsScaleTarget += scaleFactor;
            }
        }

        // if scale has changed
        if (Math.abs(boundsScale.x - boundsScaleTarget) > 0.01) {
            // smoothly tween scale factor
            scaleFactor = (boundsScaleTarget - boundsScale.x) * 0.2;
            boundsScale.x += scaleFactor;
            boundsScale.y += scaleFactor;

            // scale the render bounds
            render.bounds.max.x = render.bounds.min.x + render.options.width * boundsScale.x;
            render.bounds.max.y = render.bounds.min.y + render.options.height * boundsScale.y;

            // translate so zoom is from centre of view
            translate = {
                x: render.options.width * scaleFactor * -0.5,
                y: render.options.height * scaleFactor * -0.5
            };

            Bounds.translate(render.bounds, translate);

            // update mouse
            Mouse.setScale(mouse, boundsScale);
            Mouse.setOffset(mouse, render.bounds.min);
        }

        // get vector from mouse relative to centre of viewport
        var deltaCentre = Vector.sub(mouse.absolute, viewportCentre),
            centreDist = Vector.magnitude(deltaCentre);

        // translate the view if mouse has moved over 50px from the centre of viewport
        if (centreDist > 50) {
            // create a vector to translate the view, allowing the user to control view speed
            var direction = Vector.normalise(deltaCentre),
                speed = Math.min(10, Math.pow(centreDist - 50, 2) * 0.0002);

            translate = Vector.mult(direction, speed);

            // prevent the view moving outside the extents
            if (render.bounds.min.x + translate.x < extents.min.x)
                translate.x = extents.min.x - render.bounds.min.x;

            if (render.bounds.max.x + translate.x > extents.max.x)
                translate.x = extents.max.x - render.bounds.max.x;

            if (render.bounds.min.y + translate.y < extents.min.y)
                translate.y = extents.min.y - render.bounds.min.y;

            if (render.bounds.max.y + translate.y > extents.max.y)
                translate.y = extents.max.y - render.bounds.max.y;

            // move the view
            Bounds.translate(render.bounds, translate);

            // we must update the mouse too
            Mouse.setOffset(mouse, render.bounds.min);
        }
    });

    // context for MatterTools.Demo


</script>

</body>
</html>