Sample code to rotate an NSImage
Sample code to rotate an NSImage
- Subject: Sample code to rotate an NSImage
- From: Dave Riggle <email@hidden>
- Date: Thu, 18 Sep 2003 10:06:16 -0700
The following routine works, but I don't like it. The transformations
seem to get applied in reverse order. Is that the way
NSAffineTransform is supposed to work?
Dave
+ (NSImage *)rotate:(NSImage *)image byAngle:(int)degrees
{
if (degrees == 0) {
return image;
} else {
NSSize beforeSize = [image size];
NSSize afterSize = degrees == 90 || degrees == -90 ?
NSMakeSize(beforeSize.height, beforeSize.width) : beforeSize;
NSImage* newImage = [[[NSImage alloc] initWithSize:afterSize]
autorelease];
NSAffineTransform* trans = [NSAffineTransform transform];
[newImage lockFocus];
[trans translateXBy:afterSize.width * 0.5 yBy:afterSize.height
* 0.5];
[trans rotateByDegrees:degrees];
[trans translateXBy:-beforeSize.width * 0.5
yBy:-beforeSize.height * 0.5];
[trans set];
[image drawAtPoint:NSZeroPoint
fromRect:NSMakeRect(0, 0, beforeSize.width,
beforeSize.height)
operation:NSCompositeCopy
fraction:1.0];
[newImage unlockFocus];
return newImage;
}
}
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