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    While code snippets are useful in explanations, it is always best to compose a fully compilable MWE that illustrates the problem including the \documentclass and the appropriate packages so that those trying to help don't have to recreate it. Especially with tikz since there are numerous libraries that could be used. Commented May 2, 2012 at 21:03
  • Are the coordinates of (a) and (b) given? Actually what are the given data and what do you want to automate exactly? Commented May 2, 2012 at 21:19
  • @percusse: Nothing as complicated as that. I think, my question was already answered below. Commented May 2, 2012 at 21:48