Re: [Matplotlib-users] Customize SHADOW

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OK, yesterday I was taking a look to the patch module. then, I went home.
Today, I'll continue to look at these properties of alpha. because, yes,
that's what's happening. one have alpha .5 and the other, 1.
Answering Mike's question: the first system (the one I've wrote the code) is
ubuntu 9.04, the other (with a newer version) is ubuntu server 8.04
LTS.Doesn't make any difference.

On Thu, Oct 1, 2009 at 9:37 AM, Michael Droettboom <md...@st...> wrote:

> Yeah, alpha handling is a bit of a mess -- it should probably be revamped
> in light of the fact that most places now accept rgba.  We just need to
> decide if there is a good solution that doesn't break backward
> compatibility, or whether we should just break compatibility (e.g. remove
> set/get_alpha) moving forward.
>
> As for the current problem, I'll add a set_alpha call to the Shadow class.
>
> Mike
>
>
> Jae-Joon Lee wrote:
>
>> Mike,
>>
>> I think this maybe related with some changes in how alpha is set (this
>> happened sometime early this year I guess).
>>
>> I think the issue here is, when the shadow patch is created, it sets
>> its facecolor with alpha=0.5., i.e., its _facecolor is something like
>> (r, g, b, 0.5). But, shadow._alpha = 1 still. And later when the
>> shadow is drawn, the alpha of the facecolor is simply overridden by
>> _alpha. Given that alpha=0.5 is intended, I think this is a bug. But
>> I'm not sure what is the preferred way to fix this.
>>
>> I think this is a general issue of Patch classes. While the alpha
>> values can be set with facecolor and edgecolor, they are simply
>> overridden by _alpha. If this behavior is necessary and intended, we
>> should change the Shadow class to set its alpha correctly.
>>
>> I, personally, want to have different alphas for the facecolor and
>> edgecolor, which cannot be done with the current approach. However, I
>> believe the current backend api itself (draw_path) does not allow
>> different alphas for edgecolor and facecolor, so it may best stick to
>> the current behavior.
>>
>> Regards,
>>
>> -JJ
>>
>>
>> On Wed, Sep 30, 2009 at 4:51 PM, Michael Droettboom <md...@st...>
>> wrote:
>>
>>
>>> I'm still not seeing a difference between 0.98.5 and 0.99.1 here.  I
>>> further investigation of the code shows that there were no changes in
>>> how the shadow color is computed between these versions.  Is it possible
>>> you're using an even earlier version?  You can determine it using:
>>>
>>>  >>> import matplotlib
>>>  >>> matplotlib.__version__
>>>
>>> Are there any other differences between the two installations, such as
>>> backend?
>>>
>>> Cheers,
>>> Mike
>>>
>>> Gewton Jhames wrote:
>>>
>>>
>>>> sorry, this is the script:
>>>>
>>>> #!/usr/bin/python
>>>> # -*- coding: utf-8 -*-
>>>> from pylab import *
>>>>
>>>> from matplotlib.pyplot import figure, show
>>>> from matplotlib.patches import Ellipse
>>>> import numpy as np
>>>>
>>>> figure(1, figsize=(6,6), facecolor='#ffffff')
>>>> ax = axes([0.1, 0.1, 0.8, 0.8])
>>>>
>>>> labels = 'label1', 'label2'
>>>> fracs = [40, 60]
>>>> colors = ['#E3AB9C', '#C6E9F8']
>>>>
>>>> explode=(0, 0.05)
>>>>
>>>> plots = pie(fracs, explode=explode, labels=labels, colors=colors,
>>>> autopct='%0.2f%%', shadow=True)
>>>> plots[0][0].set_edgecolor('#E4471A')
>>>> plots[0][1].set_edgecolor('#1AA8E4')
>>>> title('Raining Hogs and Dogs', bbox={'facecolor':'0.8', 'pad':5})
>>>>
>>>>
>>>> show()
>>>>
>>>>
>>>> On Wed, Sep 30, 2009 at 5:19 PM, Michael Droettboom <md...@st...
>>>> <mailto:md...@st...>> wrote:
>>>>
>>>>    Can you provide the script that produces these graphs?  I don't
>>>>    see any difference between 0.98.5 and 0.99.1 on the included
>>>>    pie_demo.py example.  Which backend are you using?
>>>>
>>>>    Mike
>>>>
>>>>    Gewton Jhames wrote:
>>>>
>>>>        Hello, I'm having two different results in the shadow of a
>>>>        graph. I develop the graph in a system with matplotlib 0.98.5.
>>>>        When I put the code in other machine, with the same version of
>>>>        libpng, but with matplotlib 0.99.0, the shadow of the graph
>>>>        has changed to a real bad one.
>>>>
>>>>        In attachment, the two generated graphs. I wish that the
>>>>        graph's shadown generated in 0.99 be the same of 0.98.5.
>>>>
>>>>        Well, see the attachment and you'll understand.
>>>>        thanks.
>>>>
>>>>
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>>>>
>>>>    --
>>>>    Michael Droettboom
>>>>    Science Software Branch
>>>>    Operations and Engineering Division
>>>>    Space Telescope Science Institute
>>>>    Operated by AURA for NASA
>>>>
>>>>
>>>>
>>>>
>>> --
>>> Michael Droettboom
>>> Science Software Branch
>>> Operations and Engineering Division
>>> Space Telescope Science Institute
>>> Operated by AURA for NASA
>>>
>>>
>>>
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>>
> --
> Michael Droettboom
> Science Software Branch
> Operations and Engineering Division
> Space Telescope Science Institute
> Operated by AURA for NASA
>
>