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I am writing a GUI using tkinter that has a graph inside the main and only window. I have to update the value of the graph every 2 seconds (as I received data every 2 seconds from a serial port). I have been able to do this by using tkinter canvas.draw(). My problem is that every time the canvas is drawn (these 2 seconds), the GUI freezes for some time, and if for example I am writing a value in an entry or selecting a value of a list in the GUI in that moment, the GUI stops working temporarily and I have to click again with the mouse in the entry, so it is not convenient. I guess that the GUI is redrawing completely all the window. However I only want to redraw the graph. By the way, I am using matplolib for the graph.

So my questions are:

  1. Is it possible to avoid this problem?
  2. If it is not possible, what are the alternatives? maybe creating another tkinter window only for the graph?.
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    solution 3. reduce the data you are drawing, 2 seconds means you are drawing too much information, think of another way to represent the data with less drawing elements. Commented Jun 30, 2024 at 17:03
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    solution 4. re-implement Tkinter Matplotlib Canvas to do plotting in another thread then just blit the result on your screen when done Commented Jun 30, 2024 at 17:04
  • @AhmedAEK I received the data every 2 seconds from a serial port. I think I need to do the dedicated thread thing. Any easy example on how to do it?. Commented Jun 30, 2024 at 17:05
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    the re-implementing part means you have to re-implement all user interactions (clicking, scrolling, dragging), and you need to transfer data between threads solely as a PIL.Image, don't try doing any calls to the canvas from the other thread, those things are not thread-safe. Commented Jun 30, 2024 at 17:07
  • That seems a lot of work but I will try my best. Many thanks! Commented Jun 30, 2024 at 17:16
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