使用Graphics2D翻转图像

Question

我一直在试图弄清楚如何翻转图像，但是还没有弄清楚。

我使用Graphics2D画一个Image与

g2d.drawImage(image, x, y, null)

我只需要一种在水平或垂直轴上翻转图像的方法。

如果您愿意，可以查看github上的完整源代码。

Answer 1

来自http://examples.javacodegeeks.com/desktop-java/awt/image/flipping-a-
buffered-image
：

// Flip the image vertically
AffineTransform tx = AffineTransform.getScaleInstance(1, -1);
tx.translate(0, -image.getHeight(null));
AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
image = op.filter(image, null);


// Flip the image horizontally
tx = AffineTransform.getScaleInstance(-1, 1);
tx.translate(-image.getWidth(null), 0);
op = new AffineTransformOp(tx, AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
image = op.filter(image, null);

// Flip the image vertically and horizontally; equivalent to rotating the image 180 degrees
tx = AffineTransform.getScaleInstance(-1, -1);
tx.translate(-image.getWidth(null), -image.getHeight(null));
op = new AffineTransformOp(tx, AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
image = op.filter(image, null);