java 图片等比缩放

java图片等比缩放

这几天在用JFrame 和JLabel 展示图片 然而 图片的缩放是一个小问题, 所以写了一个工具方法 设置图片等比缩放, 方便以后查阅.
Talk is cheap. Show me the code.

直接上代码

// An highlighted block
private static Image changeImage(int cWidth,int cHeight,Image image,boolean isRatio){
    //将图片等比缩放到容器矩形内
    ImageIcon imageIcon = new ImageIcon(image);
    //默认值 强制拉伸
    int showWidth = cWidth;
    int showHeight = cHeight;

    //等比缩放
    if(isRatio){
      //获得 原宽和原高
      int oriWidth = imageIcon.getIconWidth();
      int oriHeight = imageIcon.getIconHeight();

      if(1.0 * oriWidth/oriHeight >= 1.0 * cWidth/cHeight){
        //图片比较宽
        showHeight = showWidth * oriHeight / oriWidth;
      }else {
        //图片比较长
        showWidth = showHeight * oriWidth / oriHeight;
      }
    }

    Image scaledInstance = imageIcon.getImage().getScaledInstance(showWidth, showHeight, Image.SCALE_DEFAULT);
    return scaledInstance;
  }

You can never plan the future by the past.
送给努力的自己.