kconner

macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

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hatfinch

CGAffineTransform CGAffineTransformFromRectToRect(CGRect fromRect, CGRect toRect)
{
    CGSize scale = CGSizeMake(toRect.size.width / fromRect.size.width, toRect.size.height / fromRect.size.height);
    CGRect scaledFromRect = CGRectMake(fromRect.origin.x * scale.width, fromRect.origin.y * scale.height,
                                       fromRect.size.width * scale.width, fromRect.size.height * scale.height);
    CGSize translation = CGSizeMake(fromRect.origin.x - scaledFromRect.origin.x, fromRect.origin.y - scaledFromRect.origin.y);

    return CGAffineTransformMake(scale.width, 0.0, 0.0, scale.height, translation.width, translation.height);
}