I would like to rotate and offset an NSImage and then draw it onto an
NSImageView. So far I figured out to use Quartz and use CGContextRotateCTM and
CGContextTranslateCTM. I got the offset working just fine using this, but as
soon as I introduce the rotation it rotates the image relative to the origin,
rather then the centre. I figure I need to do a combination of
CGContextTranslateCTM to move the centre of the image to the origin, then apply
a CGContextRotateCTM to rotate it and then move it back, but I can't figure out
how to best do this.
Are there any other options of doing this please let me know. I had a look
online, but all the suggestions I found seem too complicated as there must be a
simple solution to this (I hope).
...
int resultWidth = 1600;
int resultHeight = 1200;
float foregroundXoffset= 50;
float foregroundYoffset= 50;
float foregroundRotation = 10;
NSData *tiff_data = [[NSData alloc] initWithData:[[backgroundImage image]
TIFFRepresentation]];
NSBitmapImageRep * bitmap = [[NSBitmapImageRep alloc] initWithData:tiff_data];
CGImageRef imageBackground = CGImageRetain([bitmap CGImage]);
int width = 0;
int height = 0;
width = CGImageGetWidth(imageBackground);
height = CGImageGetHeight(imageBackground);
CGContextSaveGState(context);
CGContextRotateCTM(context, foregrounRotation);
CGContextTranslateCTM (context, foregroundXoffset, foregroundYoffset);
CGContextDrawImage(context, imageRect, imageBackground);
CGImageRelease(imageBackground);
CGContextRestoreGState(context);
...
Thanks in advance
Alex_______________________________________________
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