Drawing Polar Grids

Learn to draw polar grids in Ruby.

The PolarGrid class

The to_png method we’ve used up to this point isn’t going to help us much with polar grids, so let’s just subclass Grid and rewrite to_png to be what we need it to be. We'll create a new file named polar_grid.rb. We’ll add the Grid subclass and to_png method to our file.

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