用graphics2d翻转图像

nvbavucw  于 2021-07-03  发布在  Java
关注(0)|答案(5)|浏览(430)

我一直想弄清楚如何翻转图像有一段时间了,但还没弄清楚。
我在用 Graphics2DImage

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

我只需要一个方法来翻转图像的水平或垂直轴。
如果你愿意,你可以在github上查看完整的源代码。

tzcvj98z

tzcvj98z1#

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));
wkftcu5l

wkftcu5l2#

翻转图像最简单的方法是对其进行负缩放。例子:

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

它会水平翻转。这将使其垂直翻转:

g2.drawImage(image, x, y + height, width, -height, null);
64jmpszr

64jmpszr3#

你可以在你的电脑上使用变换 Graphics ,这样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这一点:

AffineTransform affineTransform = new AffineTransform(); 
//rotate the image by 45 degrees 
affineTransform.rotate(Math.toRadians(45), x, y); 
g2d.drawImage(image, m_affineTransform, null);
ql3eal8s

ql3eal8s4#

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,你需要画出来:

//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);

不管怎样,我就是这样做的。

g2ieeal7

g2ieeal75#

从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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