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Core Animation Snippets

Here are some snippets to help with performing different tasks using Core Animation.

Images

  • Convert NSImage to CGImageRef
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    - (CGImageRef)nsImageToCGImageRef:(NSImage*)image;
    {
        NSData * imageData = [image TIFFRepresentation];
        CGImageRef imageRef;
        if(imageData)
        {
            CGImageSourceRef imageSource = 
                      CGImageSourceCreateWithData(
                                (CFDataRef)imageData,  NULL);
     
            imageRef = CGImageSourceCreateImageAtIndex(
                                   imageSource, 0, NULL);
        }
        return imageRef;
    }

Scaling

  • Scale Up Five Times
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    CATransform3D transform = CATransform3DMakeScale(5.0f, 5.0f, 5.0f);
    [layer setTransform:transform];
  • Scale Down to Half Size
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    CATransform3D transform = CATransform3DMakeScale(0.5f, 0.5f, 0.5f);
    [layer setTransform:transform];

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