I want to draw lot of electrical signals like sine wave with phase shifts, cos wave and 3 phase currents and voltages. i want to use C to draw and visualize this graphs. i know it has been asked several times but please tell me how should i proceed. I read that openGL is available and also C supports graphics. which one shall i use? I don't want to spend too much time on C code but the analysis of this waveform and also to present to someone. please help.