<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>canvas高级贝塞尔曲线运动动画</title>
<script src="js/modernizr.js "></script>
</head>
<body>
<script type="text/javascript ">
window.addEventListener(‘load‘,eventWindowLoaded,false);
function eventWindowLoaded(){
canvasApp();
}
function canvasSupport(){
return Modernizr.canvas;
}
function canvasApp(){
if(!canvasSupport()){
return;
}
var pointImage = new Image();
pointImage.src="point.png ";
function drawScreen(){
context.fillStyle = ‘#eee‘
context.fillRect(0,0,theCanvas.width,theCanvas.height);
//边框
context.strokeStyle = ‘#eee‘
context.strokeRect(1,1,theCanvas.width,theCanvas.height);
var t = ball.t;
var cx = 3*(p1.x-p0.x);
var bx = 3*(p2.x-p1.x)-cx;
var ax = p3.x-p0.x-cx-bx;
var cy = 3*(p1.y-p0.y);
var by = 3*(p2.y-p1.y)-cy;
var ay = p3.y-p0.y-cy-by;
var xt = ax*(t*t*t)+bx*(t*t)+cx*t+p0.x;
var yt = ay*(t*t*t)+by*(t*t)+cy*t+p0.y;
ball.t +=ball.speed;
if(ball.t>1){
ball.t=1;
}
//绘制点
context.font = "10px sans ";
context.fillStyle = "#ff0000 ";
context.beginPath();
context.arc(p0.x,p0.y,8,0,Math.PI*2,true);
context.closePath();
context.fill();
context.fillStyle = "#fff";
context.fillText("0",p0.x-2,p0.y+2);
//
points.push({x:xt,y:yt});
for(var i =0;i<points.length;i++){
context.drawImage(pointImage,points[i].x,points[i].y,1,1);
}
context.closePath();
context.fillStyle="#000000 ";
context.beginPath();
context.arc(xt,yt,5,0,Math.PI*2,true);
context.closePath();
context.fill();
}
var p0={x:60,y:10};//起始点
var p1={x:70,y:200};//1号点
var p2={x:125,y:295};//2号点
var p3={x:350,y:350};//3号点
var ball={x:0,y:0,speed:.01,t:0};
var points=new Array();
theCanvas = document.getElementById(‘canvas‘)
context = theCanvas.getContext("2d")
setInterval(drawScreen,33);
}
</script>
<canvas id="canvas" width="800 " height="800 ">
你的浏览器无法使用canvas
小白童鞋；你的支持是我最大的快乐！！
</canvas>
</body>
</html>"
http://files.cnblogs.com/files/LoveOrHate/canvas13.rar
刚刚有人问canvas是否能完成这样的效果，然后我就大致写了个大概！这个跨度跳的比较大的
因为我也没钱买空间放demo
所以大家把代码跑一下就行了-_-//
如果问我月入上W的话,我表示http://www.vogue.com.cn/ 上面的东西很贵的！偶要把钱存起来，以后交女朋友很贵的T_T
时间： 2024-10-02 15:59:41