Question: Morphing the letter Y to an American football goalpost


I am trying to change (morph) the capital letter Yinto the shape of an American football goalpost -which has a sigle post , and the top part looks like the top part of the letter H.  The attached program is attempting to morph just three points - two of which, A, and D stay the same and the middle point Mo is meant to change from being on the line AD, to progressively change to be part of a right angle triangle.  Eventually I want to use more points - but am making heavy weather of this.  Any helpwould be appreciated. 

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