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

[Jeroen H. <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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