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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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