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Flip Image? (Read 3933 times)
ironwallaby
Flip Image?
Feb 21st, 2008, 4:20pm  
Hello,

Is there any method in the processing API to draw a flipped image (e.g. reversed in either X-axis, Y-axis, or both?)

The usual method to do this in Java, e.g. to invert either the source dimensions or the destination dimensions, do not work in Processing (seemingly intentionally).

Thanks!
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Daniel Shiffman
Re: Flip Image?
Reply #1 - Feb 21st, 2008, 5:19pm  
You can use scale() to do this:

Code:

 pushMatrix();
 scale(-1.0, 1.0);
 image(img,-img.width,0);
 popMatrix;


or you can walk through the pixels and reverse them manually
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ironwallaby
Re: Flip Image?
Reply #2 - Feb 21st, 2008, 10:40pm  
That works exactly as desired, thanks.
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CorpusCallosum
Re: Flip Image?
Reply #3 - Nov 21st, 2009, 12:56pm  
Daniel Shiffman wrote on Feb 21st, 2008, 5:19pm:
You can use scale() to do this:

Code:

 pushMatrix();
 scale(-1.0, 1.0);
 image(img,-img.width,0);
 popMatrix;



Thanks for this, however, there was just one small mistake with the code...
popMatrix; should be  popMatrix();
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Jack Kalish
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