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  • On the end I like to have similar picture. And, yes, this solve only a part of the problem. For further elements on picture I like to have names of drawn shapes: for easier puts arrows in it, add callouts shapes with comments, for simple adds lines with measures between particular shape etc. Of course, all this can be done with absolute coordinates, but how to - after some months - ad some elements to picture, where you have forest of hundreds manually set absolute coordinates? That was reasons, why I start to explore behaviours of trapezium shapes ... and stuck very quickly. Anyway, thank you Commented Sep 12, 2014 at 14:43
  • @Zarko But you don't need to manually set the coordinates: calculate them using calc. It can handle cos, sin etc. Will modify for proof-of-concept if I have time over the weekend. Commented Sep 12, 2014 at 14:46
  • @ZAndrew of course not. Most of them can be easy calculate even without calc package, it is quit elementary geometry. The problem can be easy solved on your way, of I can gives a name to drawn shape and determine on it the anchors north, south, ... north west, south west, etc which I like to use in further elements in picture. During weekend I will also investigated for other possibilities Commented Sep 12, 2014 at 15:08