On Mon, Jun 21, 2010 at 7:32 PM, Robert Bradshaw
<rober...@math.washington.edu> wrote:
> On Jun 21, 2010, at 8:12 AM, Jason Grout wrote:
>
>> Some people have just released a preliminary version of an html5 canvas
>> matplotlib backend. What this means is cool interactive 2d graphics for
>> Sage. If anyone wants to look at it and see how it works, the code is up
>> here:
>>
>> http://code.google.com/p/mplh5canvas/
>
> Very cool. Seems to be based on callbacks, which should be natural for those
> used to using twisted.
>
Let's include this in Sage soon. I just tried it out for fun on my laptop:
(1) Grab and extract the tarball from here:
http://code.google.com/p/mplh5canvas/downloads/list
then install it with "sage -python setup.py install"
(2) Install netifaces:
sage -sh
easy_install netifaces
exit
(3) In the Sage notebook, or command line, paste something like this:
import matplotlib
matplotlib.use('module://mplh5canvas.backend_h5canvas')
from pylab import *
import time
"""Simple static plot, mostly for testing zooming...
"""
clf()
theta = arange(0,8*pi,0.1)
a=1
b=.2
for dt in arange(0,2*pi,pi/2.0):
x = a*cos( theta+dt )*exp(b*theta)
y = a*sin( theta+dt )*exp(b*theta)
dt = dt+pi/4.0
x2 = a*cos( theta+dt )*exp(b*theta)
y2 = a*sin( theta+dt )*exp(b*theta)
xf = concatenate( (x,x2[::-1]) )
yf = concatenate( (y,y2[::-1]) )
p1=fill(xf,yf)
show()
Basically, you can put nearly any example from the matplotlib website
before show (and after clf()) and it will "just work".
What happens above is that a new server is started and the plot
displayed in it. Figuring out how to use our existing twisted server
for interaction could be a nontrivial but very import challenge.
This is now trac 9471:
http://trac.sagemath.org/sage_trac/ticket/9471
-- William
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