Re: [Matplotlib-users] Slow drawing of many lines in Basemap

On Aug 22, 2008, at 5:08 AM, Jeff Whitaker wrote:

> Zane Selvans wrote:
>> I'm drawing several hundred lines at a time, each consisting of  
>> 10-100  points, and it takes a couple of minutes for them all to  
>> display,  which makes me think I must be doing something stupid.
>>
> Zane:  You can set up a LineCollection like this
>
> lcoll = LineCollection(segments)
>
> then add it to the current axes
>
> ax = pylab.gca()
> ax.add_collection(lcoll)
>
> (instead of using the Basemap plot method).

It turned out that just adding:

interactive(False)

before the drawing loop, and

show()

after it, sped things up tremendously.  Instead of 5 minutes, it now  
takes about 2 seconds for the map to render.  Which, ironically, is  
much more "interactive" :)

Thanks for the pointer to LineCollection though.  I'd never seen that.

Zane

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Zane Selvans
Amateur Earthling
http://zaneselvans.org
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