createjs 下雪实例

demo: http://output.jsbin.com/davixatona

<!DOCTYPE html>

<html>

<head>

  <meta charset="utf-8">

  <meta name="viewport" content="width=device-width">

  <title>Paper</title>

  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>

  <script src="https://code.createjs.com/easeljs-0.8.2.min.js"></script>

  <script src="https://code.createjs.com/tweenjs-0.6.2.min.js"></script>

</head>

<style type="text/css">

body {

  background-color: aliceblue;

}

#js_canvas {

  border: 1px solid red;

}

</style>

<body>

  <canvas id="js_canvas" width="900" height="506"></canvas>

</body>

</html>

<script type="text/javascript">

var js_paper = [

  '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',

  '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',

  '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'

];

jQuery(function($){

  var $canvas = $('#js_canvas');

  var paperArr = [];

  var stage;

  $canvas[0].width = 900;

  $canvas[0].height = 506;

  function init(){

    for(var i = 0; i < js_paper.length; i++){

      createBitmaps('data:image/jpg;base64,' + js_paper[i]);

    }

    stage = new createjs.Stage($canvas[0]);

    createjs.MotionGuidePlugin.install(createjs.Tween);

    createjs.Ticker.setFPS(60);

    createjs.Ticker.addEventListener("tick", stage);

    setInterval(function() {

      drawPaper2(stage, paperArr);

    }, 200);

  }

  function createBitmaps(url){

    var bitmap = new createjs.Bitmap(url);

    bitmap.x = -100;

    bitmap.y = -100;

    paperArr.push(bitmap);

  }

  function drawPaper(stage, arr){

    var l= 20, r=  $canvas[0].width - 20;

    var index = Math.floor(Math.random() * arr.length);

    var f = arr[index].clone();

    //f.alpha = 0.8;

    var ran = (Math.random()>0.5?-1:1);

    var startX = l + Math.random() * (r - l);

    var x = [startX + Math.random() * 30 * (Math.random()>0.5?1:-1), startX + Math.random() * 30 * (Math.random()>0.5?1:-1), startX];

    var endY = 1800;

    var y = [endY*0.3+Math.random() * 20 * (Math.random()>0.5?1:-1), endY*0.6+Math.random() * 20 * (Math.random()>0.5?1:-1), endY];

    stage.addChild(f);

    createjs.Tween.get(f)

      .to({ guide:{ path:[startX,0,  x[0],y[0],x[1],y[1],  x[2],y[2],startX,y[2]]}, rotation: (500 + Math.random() * 500)*ran, alpha: 0}, 30000 + Math.random() * 3000, createjs.Ease.linear)

      .call(function(){

        stage.removeChild(f);

      });

  }

  function drawPaper2(stage, arr){

    var l= 20, r=  $canvas[0].width - 20;

    var index = Math.floor(Math.random() * arr.length);

    var f = arr[index].clone();

    var ran = (Math.random()>0.5?-1:1);

    var startX = l + Math.random() * (r - l);

    var x = [startX + Math.random() * 30 * (Math.random()>0.5?1:-1), startX + Math.random() * 30 * (Math.random()>0.5?1:-1), startX];

    var endY = 500;

    var y = [endY*0.3+Math.random() * 20 * (Math.random()>0.5?1:-1), endY*0.6+Math.random() * 20 * (Math.random()>0.5?1:-1), endY];

    stage.addChild(f);

    createjs.Tween.get(f)

      .to({ guide:{ path:[startX,0,  x[0],y[0],x[1],y[1],  x[2],y[2],startX,y[2]]}, rotation: (500 + Math.random() * 500)*ran, alpha:0}, 10000 + Math.random() * 3000, createjs.Ease.linear)

      .wait(100)

      //.to({alpha:0}, 400)

      .call(function(){

        stage.removeChild(f);

      });

  }

  init();

});

</script>

demo: http://output.jsbin.com/davixatona

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