Rotating an image...arg...

[detz]

I don't know why this is giving me so much trouble but I want to draw an image on the current context and have it rotate around it's center. No matter what I do it rotates around one of it's corners or some other point, how can i get it to rotate around IT'S center?

PHP Code:

CGContextSaveGState(context);
CGContextRotateCTM (context, rotate);
CGContextTranslateCTM( context, x,  y);
CGContextDrawImage(context, CGRectMake(0, 0, 100, 100), test.CGImage);
CGContextRestoreGState(context); 


[RickMaddy]

Do the translate first to get the center moved properly, then do the rotate.

[detz]

If I move the translate I get the same result..maybe my translate is wrong? Hmm, what should I be translating too..?

[RickMaddy]

The Quartz 2D Reference has a section of transformations. They show an example with a rooster image comparing how the order of transformations changes the result.

[detz]

Originally Posted by RickMaddy

The Quartz 2D Reference has a section of transformations. They show an example with a rooster image comparing how the order of transformations changes the result.

Yeah, this
Quartz 2D Programming Guide: Modifying the Current Transformation Matrix

but that doesn't help me.

[RickMaddy]

If you create a UIImageView and apply a transform it applies to the center point as describe for the transform property in UIView.

But the Quartz 2D the rotation is always around the current 0,0 coordinate.