Re: [Matplotlib-users] Re : alternative to imshow with polar axes ?

[Michael D. <md...@st...>]

Can you provide a standalone example?  This below is missing some 
imports and there are some mystery variables.

Mike

On 03/15/2011 12:25 PM, Auré Gourrier wrote:
> import matplotlib as mpl
> from matplotlib import pylab
> import numpy as np
>
> #build custom colormap
> cm_sym =customfunc()
>
> #define mesh grid
> theta = np.arange(0.,2.*math.pi+2.*math.pi/9,2.*math.pi/9)
> r = np.arange(0,1.1,0.1)
> X,Y = np.meshgrid(r,theta)
>
> #define rgba array
> polarcolorseq = mpl.cm.ScalarMappable(cmap=cm_hsvsym).to_rgba(Y)
> #set an increasing alpha value along the radius
> polarcolorseq[:,:,-1] = [list(np.arange(0,1.1,.1))]*10
>
> pylab.figure(figsize=(10,5),dpi=100,facecolor='white')
>
> #display using rectangular axis
> ax = pylab.subplot((121),axisbg='k')
> ax.imshow(np.flipud(np.swapaxes(polarcolorseq,0,1)))
>
> #display using polar axis
> ax2 = pylab.subplot((122),axisbg='k',projection='polar')    #also 
> tried with polar=True
> ax2.imshow(np.flipud(np.swapaxes(polarcolorseq,0,1)))
>
> pylab.draw()


-- 
Michael Droettboom
Science Software Branch
Space Telescope Science Institute
Baltimore, Maryland, USA