图片旋转滤镜

人气：　来源：本站原创　作者：佚名　所属栏目：图片类　[切换到繁體中文]

介绍：运用旋转滤镜，使角度转起来，看起来就像是风车在转动一样。

演示：

<!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=gb2312" />
<title>站长手册_特效演示_图片旋转滤镜</title>
<style><!--body,td{font-size: 12px;}--></style>

</head>
<body bgcolor="" 无>
<table width="100%" height="1000" border="0" cellpadding="10" cellspacing="5">
<tr>
<td valign="top">
<DIV 
style="LEFT: 200px; WIDTH: 75px; POSITION: relative; TOP: 0px; HEIGHT: 75px">
<DIV id=aDiv style="WIDTH: 70px; POSITION: absolute; HEIGHT: 70px">
<TABLE height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0>
  <TBODY>
  <TR>
    <TD vAlign=center align=middle><IMG height=70 src="/texiao/zzsc_demo/2007112501.gif" 
      width=70> </TD></TR></TBODY></TABLE></DIV></DIV>
<SCRIPT language=javascript>
<!--
///创建和运用滤镜
function rotate(name, angle){
//将角度转变成弧度
var rad = degToRad(angle);
//计算弧度的cos和sin值
costheta = Math.cos(rad);
sintheta = Math.sin(rad);

//创建对象
var el = document.getElementById(name);
if(el) {
//应用滤镜
el.style.filter = "progid:DXImageTransform.Microsoft.Matrix()";
  
//设置滤镜的属性值
el.filters.item("DXImageTransform.Microsoft.Matrix").SizingMethod = "auto expand";
el.filters.item("DXImageTransform.Microsoft.Matrix").FilterType = "bilinear";

//运用旋转滤镜
el.filters.item("DXImageTransform.Microsoft.Matrix").M11 = costheta;
el.filters.item("DXImageTransform.Microsoft.Matrix").M12 = -sintheta;
el.filters.item("DXImageTransform.Microsoft.Matrix").M21 = sintheta;
el.filters.item("DXImageTransform.Microsoft.Matrix").M22 = costheta;
}
}

//使角度转起来
var angle = 0;
function doRotate() {
//检查并确保角度值在0到360之间
if(angle>360) angle-=360;
//使角度增加
angle+=15;

//do rotation
rotate("aDiv",angle);

//定位旋转中心
var el = document.getElementById("aDiv")
el.style.top = 25 - (el.offsetHeight/2);
el.style.left = 25 - (el.offsetWidth/2);

//循环
setTimeout("doRotate();",20);
}

//角度变弧度函数
var pi = Math.PI;
function degToRad(x) { return ( x/(360/(2*pi)) ); }
function radToDeg(x) { return ( x*(360/(2*pi)) ); }
doRotate()
//-->
</SCRIPT>
</td>
</tr>
</table>
</body>
</html>

[Ctrl+A全选提示：你可先修改部分代码，再按运行]

下面教你如何应用此特效：
　--------------------------------------------------------------------------------------
　　需要在<body 这里>加入的代码：无
　--------------------------------------------------------------------------------------

以下代码加到<head>…</head>中

以下代码加到<body>…</body>中

<DIV
style="LEFT: 200px; WIDTH: 75px; POSITION: relative; TOP: 0px; HEIGHT: 75px">
<DIV id=aDiv style="WIDTH: 70px; POSITION: absolute; HEIGHT: 70px">
<TABLE height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0>
  <TBODY>
  <TR>
    <TD vAlign=center align=middle><IMG height=70 src="/texiao/zzsc_demo/2007112501.gif"
      width=70> </TD></TR></TBODY></TABLE></DIV></DIV>
<SCRIPT language=javascript>
<!--
///创建和运用滤镜
function rotate(name, angle){
//将角度转变成弧度
var rad = degToRad(angle);
//计算弧度的cos和sin值
costheta = Math.cos(rad);
sintheta = Math.sin(rad);

//创建对象
var el = document.getElementById(name);
if(el) {
//应用滤镜
el.style.filter = "progid:DXImageTransform.Microsoft.Matrix()";

//设置滤镜的属性值
el.filters.item("DXImageTransform.Microsoft.Matrix").SizingMethod = "auto expand";
el.filters.item("DXImageTransform.Microsoft.Matrix").FilterType = "bilinear";

//运用旋转滤镜
el.filters.item("DXImageTransform.Microsoft.Matrix").M11 = costheta;
el.filters.item("DXImageTransform.Microsoft.Matrix").M12 = -sintheta;
el.filters.item("DXImageTransform.Microsoft.Matrix").M21 = sintheta;
el.filters.item("DXImageTransform.Microsoft.Matrix").M22 = costheta;
}
}

//使角度转起来
var angle = 0;
function doRotate() {
//检查并确保角度值在0到360之间
if(angle>360) angle-=360;
//使角度增加
angle+=15;

//do rotation
rotate("aDiv",angle);

//定位旋转中心
var el = document.getElementById("aDiv")
el.style.top = 25 - (el.offsetHeight/2);
el.style.left = 25 - (el.offsetWidth/2);

//循环
setTimeout("doRotate();",20);
}

//角度变弧度函数
var pi = Math.PI;
function degToRad(x) { return ( x/(360/(2*pi)) ); }
function radToDeg(x) { return ( x*(360/(2*pi)) ); }
doRotate()
//-->
</SCRIPT>