用Java旋转图像

Question

我有一张Pan Card的图像，当我尝试将其旋转45度并保存时，会得到裁剪的图像。旋转图像的代码是：

    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);

Answer 1

使用AffineTransform看一下这个例子：

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

有一些代码可以加载图像，这就是核心：

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);