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JS文字球状放大效果

时间: 2016-12-06    来源: 影设计     作者: 编辑部
<html>
<head>
<title>yingsheji.com</title>
<meta http-equiv="imagetoolbar" content="no">
<style type="text/css">
body {cursor:crosshair;margin:0; padding:0; position:absolute; overflow:hidden; background:#000; left:0; top:0; width:100%; height:100%;}
span {position:absolute;font-family: verdana; font-weight: bold;}
</style>
 
<script type="text/javascript"><!--
 
T    = "What is  real?How do you define real?   Ifyou're talkingabout what youcan feel  whatyou can  smellwhat  you  cantaste and  seethen   real issimply   electrical  signalsinterpreted byyour brain!        ";
I    = 0;
o    = new Array();
xm   = -1000;
ym   = -1000;
///////////////
rad  = 80;
dim  = 200;
///////////////
W    = 0;
H    = 0;
NX   = 14;
NY   = 14;
var nx;
var ny;
 
document.onmousemove = function(e){
if (window.event) e = window.event;
xm = (e.x || e.clientX) - (nx  * .5) + dim * .5;
ym = (e.y || e.clientY) - (ny * .5) + dim * .5;
}
 
function resize() {
nx = document.body.offsetWidth;
ny = document.body.offsetHeight;
}
onresize = resize;
 
function CObj(N,i,j,c){
this.obj = document.createElement("span");
this.obj.innerHTML = c;
DOOT.appendChild(this.obj);
this.N    = N;
this.To   = 16;
this.x0   = i*2*W;
this.y0   = j*2*H;
this.anim = true;
 
this.mainloop = function(){
with (this) {
  dx   = xm - x0;
dy   = ym - y0;
dist = Math.sqrt(dx * dx + dy * dy);
if (dist < rad) {
anim = true;
M    = Math.cos(.5 * Math.PI * Math.abs(dist / rad));
c    = Math.round(84 + M * 171);
with(obj.style){
left     = x0 - dx * M;
top      = y0 - dy * M;
zIndex   = Math.round(100 + M);
fontSize = 8 + M * W * 2;
color    = "RGB("+c+","+c+","+c+")";
}
} else {
if(anim){
with(obj.style){
left     = x0;
top      = y0;
zIndex   = 0;
fontSize = 8;
color    = "RGB(88,88,88)";
}
anim = false;
}
}
}
}
}
function run(){
for(i in o)o[i].mainloop();
setTimeout(run,16);
}
 
onload = function (){
DOOT = document.getElementById("doot");
with(DOOT.style){
left = -dim/2;
top  = -dim/2;
width = dim;
height = dim;
}
resize();
W = (dim  / NX) / 2;
H = (dim / NY) / 2;
K = 0;
for(var j=0;j<NY;j++){
for(var i=0;i<NX;i++){
c=T.charAt((I++)%T.length).toUpperCase();
if(c==" ")c="·";
o[K] = new CObj(K++,i,j,c);
}
}
run();
}
//-->
</script>
</head>
 
<body>
<span style="position:absolute;left:50%;top:50%">
<span id="doot"></span>
</span>
 
</body>
</html>
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