Dear Mihai,
I want to make feynman diagrams with Dia. Is it possible ? And how? I googled this and got nothing. Can you help me, please? Is it very important
I'm not familiar with Feynman diagrams. I just had a look at http://en.wikipedia.org/wiki/Feynman_diagram While Dia does not provide special shapes for such diagrams (yet), there should be nothing that prevents you from drawing such diagrams in Dia. Is there any special functionality or shape you are looking for? The "sine-wave" part can be drawn using Bezier lines (you'll have to add some segments). Regards, Steffen