IOS dynamically draws long shadows at runtime

I am looking for everything that could help me implement long shadows drawn at runtime using Core Graphics or other available infrastructure in the iOS SDK. The screenshot below shows how I represent the shadows:

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I already did some research, I did not find any libraries that could provide this or similar functions. However, I found this video on youtube: http://www.youtube.com/watch?v=zS7ZjFZ-0lk , presenting something that I would be very pleased about. Unfortunately, I could not contact the author or get additional information about this implementation.

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