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  Image perspective transformation  (Read 1871 times)
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Offline appel

JGO Wizard


Medals: 80
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I always win!


« Posted 2005-12-16 21:18:15 »

How do I transform the following image:
Click to Play




to this image:
Click to Play
Offline Ask_Hjorth_Larsen

Junior Devvie




Java games rock!


« Reply #1 - Posted 2005-12-17 09:53:00 »

Unfortunately the transformation you want is not affine (i.e. doesn't conserve parallel lines), and therefore cannot be implemented by means of an AffineTransform.

A quick hack would be to manually rescale and redraw each horizontal line, by drawing 1-pixel-tall parts of the original image into 1-pixel-tall (but not so wide) parts of the new image, but this won't do if the operation is performance sensitive.
Offline Ask_Hjorth_Larsen

Junior Devvie




Java games rock!


« Reply #2 - Posted 2005-12-17 09:54:13 »

Oh, there are probably lots of libraries which will do the transform, or maybe something I don't know about in java2d.
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Offline c_lilian

Senior Devvie


Projects: 1


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« Reply #3 - Posted 2005-12-17 13:20:33 »

The JAI extension can do this, unfortunately they didn't include it in the standard JRE (would have been great to create small 3D games with basic texturing).

Lilian

Offline appel

JGO Wizard


Medals: 80
Projects: 4


I always win!


« Reply #4 - Posted 2005-12-19 03:13:29 »

Thanks, appearently I'll be bumping this as I've found other ways to do things. Smiley thanks anyway.
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