图片缩放比例代码

java:

private static int[] getImageWidthAndHeight(int orgW , int orgH, int avW, int avH) {
  int width=0;
  int height = 0;

  if(orgW>0&&orgH>0){
   if(orgW/orgH>=avW/avH){
    if(orgW>avW){
     width = avW;
     height = (orgH*avW)/orgW;
    }else{
     width = orgW;
     height = orgH;
    }
    System.out.println("++Widht:"+width+" Height"+height);
   }else{
    if(orgH>avH){
     height = avH;
     width = (orgW*avH)/orgH;
    }else{
     width = orgW;
     height = orgH;
    }
    System.out.println("++Widht:"+width+" Height"+height);
   }
  }
  int[] arr = new int[2];
  arr[0] = width;
  arr[1] = height;

  return arr;
}

 

javascript：

function DrawImage(ImgD,iwidth,iheight,altmsg){
     //参数(图片,允许的宽度,允许的高度)
     var image=new Image();
     image.src=ImgD.src;
     if(image.width>0 && image.height>0){
     flag=true;
     if(image.width/image.height>= iwidth/iheight){
         if(image.width>iwidth){ 
         ImgD.width=iwidth;
         ImgD.height=(image.height*iwidth)/image.width;
         }else{
         ImgD.width=image.width; 
         ImgD.height=image.height;
         }
         ImgD.alt=altmsg+" "+image.width+"×"+image.height;
         }
     else{
         if(image.height>iheight){ 
         ImgD.height=iheight;
         ImgD.width=(image.width*iheight)/image.height;       
         }else{
         ImgD.width=image.width; 
         ImgD.height=image.height;
         }
         ImgD.alt=altmsg+" "+image.width+"×"+image.height;
         }
     }
 }

 

以上代码来自网络，挺实用的