Re: [Matplotlib-users] Example showing differences between Mac O$ and Windows use

[Felix P. <fe...@ne...>]

Jeroen seems to be right. The example runs fine in on my Mac when using the Qt4Agg backend (which is the default in my matplotlibrc file), but crashes when switching to the MacOSX backend. Tested on OS X 10.8.5., Matplotlib from MacPorts.

Best,
Felix

Am 13.03.2014 um 15:53 schrieb Jeroen Hegeman <jer...@gm...>:

> Hi Christophe,
> 
> This is (I think) a known limitation of the OS X backend. One way around this is to use another backend. Which backends are available depends on how your matplotlib was built. (And unfortunately I don’t know how to figure out which ones are available, apart from trying.) In my case (matplotlib from homebrew on OS X 10.9.2) the TkAgg backend works.
> 
> To use the TkAgg backend insert these two lines:
> import matplotlib
> matplotlib.use('Agg’)
> before the line
> import matplotlib.pyplot as plt
> 
> I hope that helps.
> 
> Best regards,
> Jeroen
> 
> 
> On 13 Mar 2014, at 15:33, Christophe Bal <pro...@gm...> wrote:
> 
>> Hello,
>> I'm a little disappointed by the following test program coming from this post.
>> 
>> What are the technical reasons that make fail the following code under Mac O$ ?
>> 
>> Best regards.
>> Christophe BAL
>> 
>> ---- TEST ---
>> 
>> from random import randint,
>> choice
>> 
>> import
>> time
>> 
>> import matplotlib.pyplot as
>> plt
>> 
>> import matplotlib.patches as
>> mpatches
>> 
>> back_color 
>> = "black"
>> 
>> colors     
>> = ['red', 'green', 'cyan', 'yellow']
>> 
>> width
>> , height = 16, 16
>> 
>> 
>> fig
>> , ax = plt.subplots()
>> 
>> ax
>> .set(xlim=[0, width], ylim=[0, height]) # Or use "ax.axis([x0,x1,y0,y1])"
>> 
>> 
>> 
>> # Be sure to draw the canvas once before we start blitting. Otherwise
>> # a) the renderer doesn't exist yet, and b) there's noting to blit onto
>> 
>> fig
>> .canvas.draw()
>> 
>> 
>> 
>> def update():
>> 
>>   x 
>> = randint(0, width - 1)
>> 
>>   y 
>> = randint(0, height - 1)
>> 
>> 
>>   rect 
>> = mpatches.Rectangle(
>> 
>> 
>> (x, y), 1, 1,
>> 
>>       facecolor 
>> = choice(colors),
>> 
>>       edgecolor 
>> =
>> back_color
>> 
>> )
>> 
>>   ax
>> .add_artist(rect)
>> 
>> 
>>   start 
>> = time.time()
>> 
>>   ax
>> .draw_artist(rect)
>> 
>>   fig
>> .canvas.blit(ax.bbox)
>> 
>> 
>> print("draw >>>", time.time() - start)
>> 
>> 
>> timer 
>> = fig.canvas.new_timer(interval=1)
>> 
>> timer
>> .add_callback(update)
>> 
>> timer
>> .start()
>> 
>> 
>> plt
>> .show()
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> 
> ------------------------------------------------------------------------------
> Learn Graph Databases - Download FREE O'Reilly Book
> "Graph Databases" is the definitive new guide to graph databases and their
> applications. Written by three acclaimed leaders in the field,
> this first edition is now available. Download your free book today!
> http://p.sf.net/sfu/13534_NeoTech
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