Javascript HTML5 Canvas implements Lab bicycle animation effect

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Javascript HTML5 Canvas implements Lab bicycle animation effect_javascript skills

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May 16, 2016 pm 03:46 PM

canvas html5 javascript

The example in this article describes the implementation of Lab bicycle animation effect using Canvas of javascript HTML5. Share it with everyone for your reference. The details are as follows:

Here is a bicycle animation implemented using HTML5. You will understand the effect after running it. However, do not test it under IE8, as it will have no effect. Please test under a browser that supports the latest HTML3 and CSS3, and I wish you good luck.

The screenshot of the running effect is as follows:

The specific code is as follows:

<html>
<head>
<title>Canvas Lab单车动画，HTML5动画</title>
</head>
 <script type="text/javascript">
  var framecounter = 800;//为了完成作业，无耻了点，在这里设置变量……
  var direction = "left";
  function drawBikeBody () {
   var canvas = document.getElementById('diagonal');
   var context = canvas.getContext('2d');
   context.lineWidth = 3;
   context.beginPath();
   context.moveTo(0,0);
   context.lineTo(150,0);
   context.lineTo(100,100);
   context.closePath();
   context.moveTo(100,100);
   context.lineTo(200,75);//后轮轴承点
   context.lineTo(150,0);
   //下面那个一个脚踏
   context.moveTo(100,100);
   context.lineTo(110,120);
   context.lineTo(120,120);
   context.moveTo(110,120);
   context.lineTo(100,120);
   //另一个脚踏
   context.moveTo(100,100);
   context.lineTo(90,80);
   context.lineTo(100,80);
   context.moveTo(90,80);
   context.lineTo(80,80);
   //座包
   context.moveTo(150,0);
   context.lineTo(160,-20);
   context.lineTo(175,-20);
   context.moveTo(160,-20);
   context.lineTo(135,-20);
   //扶手
   context.moveTo(0,0);
   context.lineTo(15,-30);
   context.lineTo(10,-35);
   context.lineTo(20,-40);
   context.lineTo(40,-40);
   //前轮轴承
   context.moveTo(0,0);
   context.lineTo(-35.5,75);//前轮轴承点
   //前轮
   context.moveTo(75-35.5,75);//去掉这个目测不行啊，貌似context.arc()方法里有lineTo
   context.arc(-35.5,75,75,0,Math.PI*2,true);
   //后轮
   context.moveTo(200+75,75);
   context.arc(200,75,75,0,Math.PI*2,true);
  }
  function drawForcePiece1(){
   var canvas = document.getElementById('diagonal');
   var context = canvas.getContext('2d');
   context.beginPath();
   for(var i = framecounter; i < framecounter+360; i += 20) { 
    context.moveTo(-35.5,75);
    x = Math.cos(Math.PI / 180 * i) * 75 + (-35.5); 
    y = Math.sin(Math.PI / 180 * i) * 75 + 75; 
    context.lineTo(x,y);
    }
  }
  function drawForcePiece2(){
   var canvas = document.getElementById('diagonal');
   var context = canvas.getContext('2d');
   context.beginPath();
   for(var i = framecounter; i < framecounter+360; i += 20) { 
    context.moveTo(200,75);
    x = Math.cos(Math.PI / 180 * i) * 75 + 200; 
    y = Math.sin(Math.PI / 180 * i) * 75 + 75; 
    context.lineTo(x,y);
    }
  }
  function drawBike(){
   var canvas = document.getElementById('diagonal');
   var context = canvas.getContext('2d');
   context.clearRect(0, 0, 800, 600);
   context.save();
   context.translate(framecounter,300);
   drawBikeBody();
   context.stroke();
   context.restore();
   context.save();
   context.translate(framecounter,300);
   drawForcePiece1();
   context.stroke();
   context.restore();
   context.save();
   context.translate(framecounter,300);
   drawForcePiece2();
   context.stroke();
   context.restore();
   if (direction==="left") {
    framecounter--;
   }else{
    framecounter++;
   }
  }
  function move() {
   var interal = setInterval(function () {
  drawBike();
  }, 10);
  }  
  window.addEventListener("load",move,true);
 </script>
 <body>
  <canvas id="diagonal" width="800" height="600" style="border:1px dashed">Please update your brower to the newest version!</canvas>
  <br>
  <button id="reset" onclick="framecounter=800;">Reset</button>
  <button id="left" onclick="direction='left'">Go Left</button>
  <button id="right" onclick="direction='ture'">Go Right</button>
 </body>
</html>

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I hope this article will be helpful to everyone’s JavaScript programming design.

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