The -bestRepresentationFirDrevice: method is doing nothing better than
[anImage size] would do for you.
You are not doing anything useful with rotatedSize in your code.
Your test for if (degrees == 180.0) is completely pointless. If you
were going to do it anyway, you should be looking for 90, 180, and 270
degrees as well as all other multiples of 90 deg.
Why do you copy originalSize into rect?
How about the following alternative code typed in Mail
@implementation NSImage (MYAdditions)
- (NSImage *)copyRotatedByDegrees:(CGFloat)degrees
{
NSSize originalSize = [self size];
NSRect originalRect = NSMakeRect(0.0, 0.0, originalSize.width,
originalSize.height);
NSSize halfOriginalSize = NSMakeSize(originalSize.width / 2.0,
originalSize.height / 2.0);
NSAffineTransform* transform = [NSAffineTransform transform];
[transform rotateByDegrees: fmod(degrees, 45.0)];
NSSize halfRotatedSize = [transform transformSize:halfOriginalSize];
NSSize rotatedSize = NSMakeSize( (2.0 * halfRotatedSize.width),
(2.0 * halfRotatedSize.height));
[transform rotateByDegrees: -fmod(degrees, 45.0)];
NSImage *rotatedImage = [[[NSImage alloc]
initWithSize:rotatedSize] autorelease];
[rotatedImage setBackgroundColor:[NSColor clearColor]];
[rotatedImage lockFocus];
[transform translateXBy:halfRotatedSize.width
yBy:halfRotatedSize.height];
[transform rotateByDegrees: degrees];
[transform translateXBy: -halfRotatedSize.width yBy: -
halfRotatedSize.height];
[transform concat];
[self drawAtPoint:NSZeroPoint fromRect:originalRect
operation:NSCompositeSourceOver fraction:1.0];
[[NSColor blackColor] set];
NSFrameRect(originalRect);
[rotatedImage unlockFocus];
return rotatedImage;
}
@end
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