一、将图片转成icon码的实现方式
js代码
图片预览功能
function previewImage(file,imgNum)
{
var MAXWIDTH = 200;
var MAXHEIGHT = 200;
var div = document.getElementById('preview'+imgNum);
if (file.files && file.files[0])
{
div.innerHTML ='![]()
';
var img = document.getElementById('imghead'+imgNum+'');
img.onload = function(){
var rect = clacImgZoomParam(MAXWIDTH,MAXHEIGHT,img.offsetWidth,img.offsetHeight);
img.width = rect.width;
img.height = rect.height;
// img.style.marginLeft = rect.left+'px';
img.style.marginTop = rect.top+'px';
}
var reader = new FileReader();
reader.onload = function(evt){img.src = evt.target.result;}
reader.readAsDataURL(file.files[0]);
}
else //
{
var sFilter='filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
file.select();
var src = document.selection.createRange().text;
div.innerHTML = '![]()
';
var img = document.getElementById('imghead2');
img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
var rect = clacImgZoomParam(MAXWIDTH,img.offsetHeight);
status =('rect:'+rect.top+','+rect.left+','+rect.width+','+rect.height);
div.innerHTML = "";
}
}
function clacImgZoomParam( maxWidth,maxHeight,width,height ){
var param = {top:0,left:0,width:width,height:height};
if( width>maxWidth || height>maxHeight )
{
rateWidth = width / maxWidth;
rateHeight = height / maxHeight;
if( rateWidth > rateHeight )
{
param.width = maxWidth;
param.height = Math.round(height / rateWidth);
}else
{
param.width = Math.round(width / rateHeight);
param.height = maxHeight;
}
}
param.left = Math.round((maxWidth - param.width) / 2);
param.top = Math.round((maxHeight - param.height) / 2);
return param;
}