javascript+HTML5的Canvas实现Lab单车动画效果
发布于 2017-04-19 00:47:50 | 160 次阅读 | 评论: 0 | 来源: 网友投递
这里有新鲜出炉的Javascript教程，程序狗速度看过来！
JavaScript客户端脚本语言
Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言，主要目的是为了解决服务器端语言，比如Perl，遗留的速度问题，为客户提供更流畅的浏览效果。
这篇文章主要介绍了javascript+HTML5的Canvas实现Lab单车动画效果,涉及javascript使用Canvas配合数学运算实现自行车动画效果,需要的朋友可以参考下
本文实例讲述了javascript+HTML5的Canvas实现Lab单车动画效果。分享给大家供大家参考。具体如下：
这里运用HTML5实现的单车动画，运行一下效果你就明白了，不过不要在IE8下测试，没效果的。请在支持最新HTML3和CSS3的浏览器下测试，祝您好运。
运行效果截图如下：
具体代码如下：
<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>
希望本文所述对大家的javascript程序设计有所帮助。
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