Re: [matplotlib-devel] radial grids broken on polar?

Jae-Joon Lee wrote:
> 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.

This is not the right solution, though.  There was a reason for the 
change in default resolution to 1--it gives the expected behavior for 
plotting a line between two points in polar coordinates--and it is not 
going back.  The inability to set resolution on a per-artist basis is a 
serious problem that doesn't seem to have a simple solution.  Until one 
can be found, some sort of special case handling will be needed for the 
radial grid lines.

Eric

> 
> 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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