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Applying an AffineTransform to an Image

Posted on 2002-03-08
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Last Modified: 2012-08-14
hie..
I want to rotate an image (and store it in another image) in JAVA. Thus, i created an AffineTransform and want to apply it to a Raster. How can I do this?
I can switch from raster to other class instance, but i need to rotate the image.

plz help,
Ankur.
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Question by:ankurk
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Expert Comment

by:bobbit31
ID: 6851429
something like this?

// Create an image buffer in
//which to paint on.
BufferedImage outImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

// tx is your AffineTransform, apply it to image
Graphics2D g2d = outImage.createGraphics();
g2d.drawImage(<your original image>, tx, null);
g2d.dispose();

// JPEG-encode the image
//and write to file.
OutputStream os = new FileOutputStream(<name of new file>);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
encoder.encode(outImage);
os.close();
       


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Accepted Solution

by:
yongsing earned 100 total points
ID: 6852398
I added the tx definition to bobbit31's code:

// Create an image buffer in which to paint on.
BufferedImage outImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

AffineTransform tx = new AffineTransform();

// Rotate 90 degrees clockwise about the center of the image
tx.rotate(-Math.PI/2, (double)width/2, (double)width/2y);

Graphics2D g2d = outImage.createGraphics();
g2d.drawImage(<your original image>, tx, null);

g2d.dispose();

// JPEG-encode the image and write to file.
OutputStream os = new FileOutputStream(<name of new file>);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
encoder.encode(outImage);
os.close();
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Expert Comment

by:Moondancer
ID: 6958057
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Expert Comment

by:Venci75
ID: 7902158
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:
Answered by: yongsing
Please leave any comments here within the next seven days.
 
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Expert Comment

by:Netminder
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Per recommendation, force-accepted.

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