Re: [Matplotlib-users] Edges for wedges problem

[Shahar Shani-K. <ka...@po...>]

Hi,

add linewidths=0 (or edgecolor='none', will do the same) to p = PatchCollection(patches, cmap=my_cmap)

note that PatchCollections can either get their properties from the original patch you create (the wedge) via the option *match_original* which defaults to false.

Shahar

On Jul 5, 2014, at 6:27 PM, Virgil Stokes <vs...@it...> wrote:

> I am using matplotlib version 1.3.1 with numpy 1.7.1 on a win32 platform for the 
> following code:
> 
> 
> import matplotlib
> import matplotlib.pyplot as plt
> from matplotlib.collections import PatchCollection
> import matplotlib.colors as col
> import matplotlib.cm     as cm
> from matplotlib.patches import Wedge
> import numpy as np
> 
> 
> def register_cmap(cmapName):
>     """
>      Purpose: define colormap using the from_List() method as a
>               segmented list and register it.
>     """
>     startcolor = '#00AF33'   # truegreen
>     midcolor   = '#FFE600'   # yolk (a medium dark yellow)
>     endcolor   = '#FF0033'   # bright red
>     cmap2      = col.LinearSegmentedColormap.from_list(cmapName,
> [startcolor,midcolor,endcolor])
>     cm.register_cmap(cmap=cmap2)
>     return cmap2
> 
> # Define my colormap red->yellow->green for curvature
> my_cmap = register_cmap('reylgr')
> 
> 
> # Modified matplotlib gallery example
> radii = np.arange(0.0,1.05,.05) # inner radius of rings
> width = 0.05  # width of rings
> patches = []
> for r in radii:
>     wedge = Wedge((0.0,0.0), r+width, 0.0,360.0, width = width)
>     patches.append(wedge)
> 
> fig = plt.figure()
> ax = fig.add_subplot(111)
> 
> colors = radii
> p = PatchCollection(patches, cmap=my_cmap)
> p.set_array(colors)
> ax.add_collection(p)
> ax.set_xlim(-1.5,+1.5)
> ax.set_ylim(-1.5,+1.5)
> plt.colorbar(p)
> 
> plt.show()
> 
> When I execute this code I do get concentric circles (wedge rings) as expected. 
> However,
> I do not want "edges" along the boundaries of the rings. I would like the color 
> changes
> between rings to look like the colorbar.
> 
> I have tried several options with Wedge (e.g. edgecolor = "none"); but, this had 
> no observable effect.
> 
> Help on this would be appreciated.
> 
> 
> 
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