ctrlimage.js

来自「新闻系统 1」· JavaScript 代码 · 共 63 行

//改变透明度参数：图片对象，透明度：1-100的值
function setAlpha(imgObj,opacityValue){
	imgObj.filters.alpha.opacity=parseInt(opacityValue);
	}
	
//图片的显示大小[以宽度来限制]
function DrawImageW(imgObj,widthValue){ 
	var image=new Image(); 
	image.src=imgObj.src; 
	if(image.width>0 && image.height>0){ 
		if(image.width>=widthValue){ 
			imgObj.width=widthValue; 
			imgObj.height=(image.height*widthValue)/image.width; 
		}else{ 
			imgObj.width=image.width; 
			imgObj.height=image.height; 
		}  
	} 
} 

//图片的显示大小[以高度来限制]
function DrawImageH(imgObj,heightValue){ 
	var image=new Image(); 
	image.src=imgObj.src; 
	if(image.width>0 && image.height>0){ 
		if(image.height>=heightValue){ 
			imgObj.height=heightValue; 
			imgObj.width=(image.width*heightValue)/image.height; 
		}else{ 
			imgObj.width=image.width; 
			imgObj.height=image.height; 
		}  
	} 
} 
//图片的显示大小[宽高同时限制]
function DrawImage(imgObj,widthValue,heightValue){ 
	var image=new Image(); 
	image.src=imgObj.src;
	if(image.width>0 && image.height>0){ 
		if(image.height>heightValue||image.width>widthValue){
			var h=0,w,wflg=false;
			if(image.height>heightValue)
				wflg=true;
			if(wflg){
				w=widthValue; 
				h=(image.height*widthValue)/image.width; 
				}
			if(h==0||h>heightValue){
				h=heightValue; 
				w=(image.width*heightValue)/image.height; 
				}
				//alert(w)
				//alert(h)
				imgObj.width=w; 
				imgObj.height=h; 
		}else{ 
			imgObj.width=image.width; 
			imgObj.height=image.height; 
		}  
	} 
}