Javascript HTML5 Canvas melaksanakan kemahiran animasi effect_javascript basikal Lab-tutorial js-php.cn

Javascript HTML5 Canvas melaksanakan kemahiran animasi effect_javascript basikal Lab

WBOY

Lepaskan： 2016-05-16 15:46:23

asal

1726 orang telah melayarinya

Contoh dalam artikel ini menerangkan pelaksanaan kesan animasi basikal Lab menggunakan Kanvas HTML5 javascript. Kongsikan dengan semua orang untuk rujukan anda. Butirannya adalah seperti berikut:

Berikut ialah animasi basikal yang dilaksanakan menggunakan HTML5 Anda akan memahami kesannya selepas menjalankannya Namun, jangan mengujinya di bawah IE8, kerana ia tidak akan memberi kesan. Sila uji di bawah penyemak imbas yang menyokong HTML3 dan CSS3 terkini, dan saya ucapkan selamat maju jaya.

Tangkapan skrin kesan berjalan adalah seperti berikut:

Kod khusus adalah seperti berikut:

<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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Saya harap artikel ini akan membantu reka bentuk pengaturcaraan JavaScript semua orang.