使用Graphics2D翻轉圖像

Question

我一直在試圖弄清楚如何翻轉圖像一段時間，但還沒有弄清楚。

我使用的Graphics2D繪製一個圖像的

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

我只需要一種方法來翻轉在水平軸或垂直軸的圖像。

如果你願意，你可以看看完整的源代碼在GitHub上（link）

編輯：Woops，我的意思是放在標題「炫」，而不是「旋轉」。

Answer 1

從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

你可以在你的Graphics上使用變換，它應該旋轉圖像。下面是一個示例代碼，你可以用它來達致這：

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

Answer 3

的最簡單的方式翻轉圖像是由負縮放它。 例如：

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

這將水平翻轉它。這將垂直翻轉：

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

Answer 4

旋轉圖像垂直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));