Re: [Matplotlib-users] Alpha and colorbar using contourf

[Eric F. <ef...@ha...>]

Tom,

This is a bug.  It looks like I completely forgot about handling alpha 
when I rewrote the colorbar code.  I will try to get it fixed in the 
next few days.  Thanks for the report.

Eric

Tom Denniston wrote:
> When I use contourf with an alpha argument and the "hot" color scheme.  
> The alpha causes the colors to come out lighter but the colorbar does 
> not adjust accordingly.  Is this a bug or do I simply need to adjust the 
> colorbar in some manner?
>  
>  
>  
> Below is an adaptation of pcolor.py from the screenshots page and 
> attached is the output I see.
>  
> I am using matplotlib 0.87.7:
> 
> In [3]: matplotlib.__version__
> Out[3]: '0.87.7'
> 
>  --------------------------------------------------
> 
>  
>  
> 
> from __future__ import division
> from pylab import *
> 
> def func3(x,y):
>     return (1- x/2 + x**5 + y**3)*exp(-x**2-y**2)
> 
> dx, dy = 0.025, 0.025
> x = arange(-3.0, 3.0, dx)
> y = arange(-3.0, 3.0, dy)
> X,Y = meshgrid(x, y)
> 
> Z = func3(X, Y)
> 
> 
> cset = contourf(Z, arange(-1.2,1.6,0.5),
>                origin='lower',
>                extent=(-3,3,-3,3), alpha=.5
>                )
> 
> 
> axis('off')
> hot()
> colorbar()
> title('Some like it hot')
> show('example')
> 
> 
> ------------------------------------------------------------------------
> 
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