To perform electrostatic calculations in a two-dimensional area, the following steps are performed:

1. The calculation area is specified by clicking on vertices interactively by the user.
2. The app automatically generates a computational grid, which can be interactively modified by the user.
3. The app is a proposal for boundary conditions which can confirm the user or change interactively.
4. The electrostatic problem is solved in the computational domain and marked the solution.

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