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  • Sorry, isn't simpler to draw double lines (with a adequate double distance? Commented Sep 12, 2014 at 13:36
  • Did you also consider this one ? tex.stackexchange.com/questions/106969 Commented Sep 12, 2014 at 13:40
  • 'Claudio Fiandrino', probably it is, but how to gives names to line for later use for anchors of other nodes and lines (omitted in MWE)? Commented Sep 12, 2014 at 13:45
  • Giving coordinates at the beginning and/or end of the paths. See the for instance the very elegant Alain's example. Of course, to put things at the middle of the path, you always have the pos key. Commented Sep 12, 2014 at 13:49
  • percusse, I read answer in given link. I will read it again, maybe I missed something in it. In first reading I didn't see/figured out an algorithm which can I use to calculate angles for left and right border line for given rotating angle, shape width and hight. I'm very sure, that it exist., but it is very well hidden from me ... Commented Sep 12, 2014 at 14:50