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Index › Programming Questions & Help › Syntax Questions › how to rotate an image without rotate() function
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how to rotate an image without rotate() function? (Read 324 times)
peni_yoe
how to rotate an image without rotate() function?
Nov 9th, 2008, 11:21am  
Dear all ,
could you help me how to rotate an image without rotate() function? using sin and cos function

thanks Smiley
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antiplastik
Re: how to rotate an image without rotate() functi
Reply #1 - Nov 9th, 2008, 6:19pm  
Draw a textured quad maybe ?

Is there a special reason you don't want to use rotate() ?
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koogy
Re: how to rotate an image without rotate() functi
Reply #2 - Nov 9th, 2008, 8:00pm  
(homework question?)

is just a case of iterating through the pixels and translating the source x and y to the new position using the input angle and standard 2d rotation matrix (see wikipedia).

it'll look pretty bad though because you'll get some overlap and some gaps in the output where the transformed pixels are reduced to integer positions.
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