使用Graphics2D翻转图像 [英] Flip Image with Graphics2D

问题描述

我一直想弄清楚如何翻转图像一段时间，但还没想出来。

I've been trying to figure out how to flip an image for a while, but haven't figured out yet.

我正在使用 Graphics2D 使用

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

我只需要一种方法在水平轴或垂直轴上翻转图像。

I just need a way to flip the image on the horizontal or vertical axis.

如果您需要，可以查看 github上的完整源代码。

If you want you can have a look at the full source on github.

推荐答案

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);

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