fix the centered grid

[GeorgeLiang3]

Description

Change the centers of the grid growing exponentially to the left and right boundaries growing exponentially instead, and find the centers points by the defined boundaries.

Resolves #578

Checklist

• [ ] My code follows the PEP 8 style guidelines.
• [ ] My code uses type hinting for function and method arguments and return values.
• [ ] My code contains descriptive and helpful docstrings which are formatted per the Google Python Style Guidelines.
• [ ] I have created tests which entirely cover my code.
• [ ] The test code either 1. demonstrates at least one valuable use case (e.g. integration tests) or 2. verifies that outputs are as expected for given inputs (e.g. unit tests).
• [ ] New and existing tests pass locally with my changes.