Defining polar axes in rectangular boxes

In the preceding recipe, we learned to define custom transformation and used it to draw curved grid lines in curvilinear coordinates. However, they both use the Cartesian coordinate system of x, y co-ordinates. In this recipe, we will learn how to use polar coordinates (angle and radius coordinates) in a rectangular box. In this recipe, as well as in all upcoming ones, we will use pre-built transformations provided by Matplotlib.

Getting ready

You'll need to import the requisite libraries using the following commands:

import matplotlib.pyplot as plt
import numpy as np
from mpl_toolkits.axisartist.grid_helper_curvelinear import GridHelperCurveLinear
import mpl_toolkits.axisartist...