The default resolution (which is used to interpolate a path in polar
coordinate) has change to 1 at some point. And because of this, a
radial grid becomes a 0-length line. Increasing the resolution will
bring back your gridlines.
ax = fig.add_axes([0.1, 0.1, 0.8, 0.8], polar=True, axisbg='#d5de9c',
resolution=100)
-JJ
On Thu, May 21, 2009 at 10:13 PM, John Hunter <jd...@gm...> wrote:
> When plotting the polar demo, I am not getting radial grids on the
> trunk (but I am getting them on the branch). Any ideas?
>
> import matplotlib
> import numpy as np
> from matplotlib.pyplot import figure, show, rc, grid
>
> # radar green, solid grid lines
> rc('grid', color='#316931', linewidth=1, linestyle='-')
> rc('xtick', labelsize=15)
> rc('ytick', labelsize=15)
>
> # force square figure and square axes looks better for polar, IMO
> width, height = matplotlib.rcParams['figure.figsize']
> size = min(width, height)
> # make a square figure
> fig = figure(figsize=(size, size))
> ax = fig.add_axes([0.1, 0.1, 0.8, 0.8], polar=True, axisbg='#d5de9c')
>
> r = np.arange(0, 3.0, 0.01)
> theta = 2*np.pi*r
> ax.plot(theta, r, color='#ee8d18', lw=3)
> ax.set_rmax(2.0)
>
> ax.set_rgrids(np.arange(0.5, 2.0, 0.5))
> ax.grid(True)
>
> ax.set_title("And there was much rejoicing!", fontsize=20)
> show()
>
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