[Cocoa]_[初级]_[使用NSAffineTransfrom 对NSImage图片进行旋转]

概述-(NSImage *)roateSourceImage:(NSImage *) sourceImage ByDegrees:(CGFloat)degrees{ NSAutoreleasePool *pool = [NSAutoreleasePool new]; NSRect imageBounds = {NSZeroPoint, [sourceImage size]}

-(NSImage *)roateSourceImage:(NSImage *) sourceImage Bydegrees:(CGfloat)degrees{        NSautoreleasePool *pool = [NSautoreleasePool new];    NSRect imageBounds = {NSZeroPoint,[sourceImage size]};    NSBezIErPath* boundsPath = [NSBezIErPath                                bezIErPathWithRect:imageBounds];    NSAffinetransform* transform = [NSAffinetransform transform];        [transform rotateBydegrees:degrees];    [boundsPath transformUsingAffinetransform:transform];        NSRect rotatedBounds = {NSZeroPoint,[boundsPath bounds].size};    NSImage* rotatedImage = [[NSImage alloc]                              initWithSize:rotatedBounds.size];        // center the image within the rotated bounds    imageBounds.origin.x = NSMIDX(rotatedBounds) - (NSWIDth                                                    (imageBounds) / 2);    imageBounds.origin.y = NSMIDY(rotatedBounds) - (NSHeight                                                    (imageBounds) / 2);        // set up the rotation transform    transform = [NSAffinetransform transform];    [transform translateXBy:+(NSWIDth(rotatedBounds) / 2) yBy:+     (NSHeight(rotatedBounds) / 2)];    [transform rotateBydegrees:degrees];    [transform translateXBy:-(NSWIDth(rotatedBounds) / 2) yBy:-     (NSHeight(rotatedBounds) / 2)];        // draw the original image,rotated,into the new image    [rotatedImage lockFocus];       [transform set] ;    [sourceImage drawInRect:imageBounds fromrect:NSZeroRect operation:NSCompositecopy fraction:1.0];    [rotatedImage unlockFocus] ;    [pool drain];        return rotatedImage ;}

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