From reading Chart::Gnuplot, I guess that the terminal => 'windows' option makes Gnuplot itself display a window. Your Tk program will halt until that Gnuplot window is closed. Either make Chart::Gnuplot output a PNG (or whatever) image and display that in Tk, or find a way to make Chart::Gnuplot return control to your main program immediately.

In reply to Re: Integrating TK and Chart::Gnuplot. by Corion
in thread Integrating TK and Chart::Gnuplot. by Ppeoc

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