Java旋转ImageBuffer失败 [英] Java rotating an ImageBuffer fails

问题描述

当我尝试旋转一个名为pic的BufferImage实例时，它会调整大小并歪斜并裁剪图像，有关使其正常工作的任何建议

I am trying to rotate an instance of a BufferImage named pic when I try this it resizes and skews and crops the image, any advice to get it to work properly

public void rotate(double rads){
    AffineTransform tx = new AffineTransform();
    tx.rotate(rads,pic.getWidth()/2,pic.getHeight()/2);
    AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_BILINEAR);
    pic = op.filter(pic, null);
}

当我旋转90°时，它可以正常工作，所以我想知道是否问题是图像的形状吗？

When I have it rotate 90˚ it works fine so I'm wondering if the problem is that it is the shape of the image?

推荐答案

用于 AffineTransform ，则可以使用以下类似的图像对图像进行平方处理：

For use with AffineTransform, you can square an image using something like this:

private BufferedImage getImage(String name) {
    BufferedImage image;
    try {
        image = ImageIO.read(new File(name));
    } catch (IOException ioe) {
        return errorImage;
    }
    int w = image.getWidth();
    int h = image.getHeight();
    int max = Math.max(w, h);
    max = (int) Math.sqrt(2 * max * max);
    BufferedImage square = new BufferedImage(
            max, max, BufferedImage.TYPE_INT_ARGB);
    Graphics2D g2d = square.createGraphics();
    g2d.setRenderingHint(
            RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);
    g2d.drawImage(image, (max - w) / 2, (max - h) / 2, null);
    g2d.dispose();
    return square;
}

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