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no, I need to draw something like a diagram. where blocks are connected with lines. besides each block or line, there are displayed some variables like signal_level. if I extend the line, that variable changes automatically. variables are calculated by simple formulas.
I've not heard of any software that does this. Is there something you would use under Windows or Mac, for example? One could use Dia for making diagrams like that, but as far as I know, it doesn't do any maths like you want. Out of interest, what is this for? There may be another way to do what you want.
I've use the pgf/tikz package for LaTeX when I needed some mathematical drawings http://en.wikipedia.org/wiki/PGF/TikZ
If this doesn't meet your requirements you should also take a look at "Metapost" and "PSTricks" which are also packages for TeX/LaTeX.
All these packages are program-able in that they can do the math on their own, you can work with variables.