java 图片等比缩放

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.