使用Matter.js实现围绕在标题文本周围的重力球效应

BALLS and GRAVITY，圆球有重力感应，并且实现了和标题文本区域的碰撞检测。可拖拉球体来抛射对象。

html5, gravity

《three.js如何实现贴图模糊效果 - 使用canvas》申请公开！

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CSS
JavaScript
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编译

JavaScript

let Engine = Matter.Engine,
    Render = Matter.Render,
    World = Matter.World,
    Mouse = Matter.Mouse,
    Bodies = Matter.Bodies,
    Common = Matter.Common,
    Vertices = Matter.Vertices,
    Svg = Matter.Svg,
    Constraint = Matter.Constraint,
    Composites = Matter.Composites,
    MouseConstraint = Matter.MouseConstraint;

// create an engine
  let engine = Engine.create();
  let idRAF = null;
function init(){
  let numm = Math.random();
  $("canvas").remove();
  
  cancelAnimationFrame(idRAF);
  let width = $(window).width();
  let height = $(window).height();
  let offset = -1;
    // module aliases
  
  engine.events = {};
  World.clear(engine.world);
  Engine.clear(engine);
  
  engine = Engine.create();

engine.world.gravity.x = 0;
  engine.world.gravity.y = 0;
  let mouseConstraint = MouseConstraint.create(engine);
  World.add(engine.world, mouseConstraint);

// create a renderer
  let render = Render.create({
    element: document.body,
    engine: engine,
    options: {
      wireframes: false,
      background: 'transparent',
      width: width,
      height: height,
      showDebug: false,
      showBroadphase: false,
      showBounds: false,
      showVelocity: false,
      showCollisions: false,
      showSeparations: false,
      showAxes: false,
      showPositions: false,
      showAngleIndicator: false,
      showIds: false,
      showShadows: false,
      showVertexNumbers: false,
      showConvexHulls: false,
      showInternalEdges: false,
      showMousePosition: false
    }
  });

// create two boxes and a ground
  // add all of the bodies to the world
  World.add(engine.world, [
    Bodies.rectangle(width / 2, height / 2, 500, 46, {
      isStatic: true,
      render: {
        fillStyle: "transparent"
      }
    }),
    
    Bodies.rectangle(width / 2, (height / 2) - 40, 180, 20, {
      isStatic: true,
      render: {
        fillStyle: "transparent"
      }
    }),
    Bodies.rectangle(width / 2, (height / 2) + 40, 180, 20, {
      isStatic: true,
      render: {
        fillStyle: "transparent"
      }
    }),
    Bodies.rectangle(width / 2, height - offset, width, 1, {
      isStatic: true,
      render: {
        fillStyle: "#FFFFFF"
      }
    }),
    Bodies.rectangle(width / 2, offset, width, 1, {
      isStatic: true,
      render: {
        fillStyle: "#FFFFFF"
      }
    }),
    Bodies.rectangle(offset, height / 2, 1, height, {
      isStatic: true,
      render: {
        fillStyle: "#FFFFFF"
      }
    }),
    Bodies.rectangle(width - offset, height / 2, 1, height, {
      isStatic: true,
      render: {
        fillStyle: "#FFFFFF"
      }
    })
  ]);

for (let i = 0; i < 230; i++) {
    let radius = 2 + Math.random() * 20
    World.add(engine.world, Bodies.circle(
      40 + Math.random() * width - 80,
      40 + Math.random() * 100,
      radius, {
        render: {
          fillStyle: ["#4285F4", "#EA4335", "#FBBC05", "#34A853"][Math.round(Math.random() * 3)]
        }

}
    ))
  }

// run the engine
  Engine.run(engine);

// run the renderer
  Render.run(render);

let inc = 0

engine.world.gravity.y = 4
  function update() {
    if(inc > 8){
      engine.world.gravity.x = Math.cos(inc / 55)
      engine.world.gravity.y = Math.sin(inc / 55)
    }
    inc++
    idRAF = requestAnimationFrame(update.bind(this))
  }

update()
}
init()

$(window).on("resize", debounce(function(){
  init()
}.bind(this), 200))

编译

CSS

@import url("https://fonts.googleapis.com/css?family=Montserrat:200,300,400,600");
.more-pens {
    position: fixed;
    left: 20px;
    bottom: 20px;
    z-index: 10;
    font-family: "Montserrat";
    font-size: 12px;
}
a.white-mode,
a.white-mode:link,
a.white-mode:visited,
a.white-mode:active {
    font-family: "Montserrat";
    font-size: 12px;
    text-decoration: none;
    background: #212121;
    padding: 4px 8px;
    color: #f7f7f7;
}
a.white-mode:hover,
a.white-mode:link:hover,
a.white-mode:visited:hover,
a.white-mode:active:hover {
    background: #edf3f8;
    color: #212121;
}
body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    width: 100%;
    height: 100%;
    background: #EFEFEF;
}
.title {
    z-index: 10;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translateX(-50%) translateY(-50%);
    font-family: "Montserrat";
    text-align: center;
    width: 100%;
}
.title h1 {
    position: relative;
    color: #121212;
    font-weight: 600;
    font-size: 60px;
    padding: 0;
    margin: 0;
    line-height: 1;
}
.title h1 span {
    font-weight: 600;
    padding: 0;
    margin: 0;
    color: #BBB;
}
.title h3 {
    font-weight: 200;
    font-size: 20px;
    padding: 0;
    margin: 0;
    line-height: 1;
    color: #121212;
    letter-spacing: 2px;
}

HTML

BALLS and GRAVITY，圆球有重力感应，并且实现了和标题文本区域的碰撞检测。可拖拉球体来抛射对象。

html5, gravity

编辑器支持Emmet

快捷键

BALLS and GRAVITY，圆球有重力感应，并且实现了和标题文本区域的碰撞检测。可拖拉球体来抛射对象。

html5, gravity

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编辑器支持Emmet

快捷键

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