在Java中旋转图像 [英] Rotating an Image in java

问题描述

我有一张潘卡的图像，当我尝试将它旋转45度并保存时，我得到一张裁剪后的图像。
旋转图片的代码是：

$ p $ BufferedImage dimg = new BufferedImage（w，h，img.getType（） ）;
Graphics2D g = dimg.createGraphics（）;
g.setRenderingHint（RenderingHints.KEY_ANTIALIASING，// Anti-alias！
RenderingHints.VALUE_ANTIALIAS_ON）;

g.rotate（Math.toRadians（angle），w / 2，h / 2）;

g.drawImage（img，null，0，0）;


解决方案

看看这个使用AffineTransform的例子： / p>

http ：//www.billthelizard.com/2008/07/rotate-image-in-java.html

有一些代码可以加载图片，然后这是核心：

 私人图片图片; 
 AffineTransform identity = new AffineTransform（）; 
 
 Graphics2D g2d =（Graphics2D）g; 
 AffineTransform trans = new AffineTransform（）; 
 trans.setTransform（identity）; 
 trans.rotate（Math.toRadians（45））; 
 g2d.drawImage（image，trans，this）; 
  

I have an image of a Pan Card and when I try to rotate it by 45 degrees and save it, I get a cropped image. Code to rotate an image is:

    BufferedImage dimg = new BufferedImage(w, h, img.getType());
    Graphics2D g = dimg.createGraphics();
    g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, // Anti-alias!
            RenderingHints.VALUE_ANTIALIAS_ON);

    g.rotate(Math.toRadians(angle), w / 2, h / 2);

    g.drawImage(img, null, 0, 0);

解决方案

Have a look at this example, using AffineTransform:

http://www.billthelizard.com/2008/07/rotate-image-in-java.html

there's some code to load the image, then this is the core:

private Image image;
AffineTransform identity = new AffineTransform();

Graphics2D g2d = (Graphics2D)g;
AffineTransform trans = new AffineTransform();
trans.setTransform(identity);
trans.rotate( Math.toRadians(45) );
g2d.drawImage(image, trans, this);

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