Question

我一直试图弄清楚如何翻转图片一段时间，但还没想到。

我正在使用Graphics2D与

一起绘制Image

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

我只需要一种在水平轴或垂直轴上翻转图像的方法。

如果您愿意，可以查看full source on github。

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);

Answer 2

最简单翻转图片的方法是通过负缩放来实现。例如：

g2.drawImage(image, x + width, y, -width, height, null);

那会水平翻转它。这将垂直翻转：

g2.drawImage(image, x, y + height, width, -height, null);

Answer 3

您可以在Graphics上使用转换，这应该可以很好地旋转图像。下面是一个示例代码，您可以使用它来实现此目的：

AffineTransform affineTransform = new AffineTransform(); 
//rotate the image by 45 degrees 
affineTransform.rotate(Math.toRadians(45), x, y); 
g2d.drawImage(image, m_affineTransform, null);

Answer 4

将图像垂直旋转180度

File file = new File(file_Name);
FileInputStream fis = new FileInputStream(file);  
BufferedImage bufferedImage = ImageIO.read(fis); //reading the image file         
AffineTransform tx = AffineTransform.getScaleInstance(-1, -1);
tx.translate(-bufferedImage.getWidth(null), -bufferedImage.getHeight(null));
AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
bufferedImage = op.filter(bufferedImage, null);
ImageIO.write(bufferedImage, "jpg", new File(file_Name));

Answer 5

您需要知道图像的宽度和高度，以确保其正确缩放：

int width = image.getWidth(); int height = image.getHeight();

然后，您需要绘制它：

//Flip the image both horizontally and vertically
g2d.drawImage(image, x+(width/2), y+(height/2), -width, -height, null);
//Flip the image horizontally
g2d.drawImage(image, x+(width/2), y-(height/2), -width, height, null);
//Flip the image vertically
g2d.drawImage(image, x-(width/2), y+(height/2), width, -height, null);

无论如何，这就是我的方法。

使用Graphics2D翻转图像

5 个答案: