How to plot predefined area in picture colorcoded for a simulation?

Hello!

I am working on a simulation right now where I calculate the Heat Transfer in a device (Turbine-Injector). For this I used a Net-Work-Model for which I needed to split the Injector into different parts and now each part is represented by an element in this model. If I run the simulation I now get a temperature for each vertice between the elements for the different timesteps.

I have a 2D drawing of the injector and now my plan is to define areas in this picture manually that correspond to the different vertices. In a next step I want to run a script so that these predefined areas change with the color according to the values I got from my simulation for the different timesteps (see picture to maybe better understand).

Does anyone have an idea on how to do this or if I even should use MATLAB for this (maybe Paraview would be better)

Thanks a lot!

BB