On Tue, 20 Dec 2011 10:48:42 -0600
Ryan May <rma...@gmail.com> wrote:
> On Tue, Dec 20, 2011 at 8:00 AM, Nils Wagner
> <nwag...@iam.uni-stuttgart.de> wrote:
>> Hi all,
>>
>> How do I use animation.FuncAnimation to plot real-life
>> data from parsing a text file ?
>
> Here's a version that does what I think you want:
>
> import matplotlib.pyplot as plt
> import matplotlib.animation as animation
> import sys
> import time
> import re
>
> x_data = [] # x
> y_data = [] # y
>
> fig = plt.figure()
> ax = fig.add_subplot(111)
> curve,= ax.plot([],[],lw=2)
> ax.set_xlim(0,5)
> ax.set_ylim(0,25)
> ax.grid()
>
> def tail_f(file):
> while True:
> where = file.tell() # current file position, an
>integer (may
> be a long integer).
> line = file.readline()
> if re.search('without errors',line): break
> # Always yield the line so that we return back to the
>event loop. If we
> # need to go back and read again, we'll get a free
>delay from the
> # animation system.
> yield line
> if not line:
> file.seek(where) # seek(offset[, whence])
>->None. Move to
> new file position.
>
>
> def run(line, curve, x, y):
> if re.search('x=',line):
> liste = line.split('=')
> x.append(liste[1].strip())
> if re.search('y=',line):
> liste = line.split('=')
> y.append(liste[1].strip())
>
> curve.set_data(x,y)
> print x,y
> return curve
>
> # The passed in frames can be a func that returns a
>generator. This
> # generator keeps return "frame data"
> def data_source(fname=sys.argv[1]):
> return tail_f(open(fname))
>
> # This init function initializes for drawing returns any
>initialized
> # artists.
> def init():
> curve.set_data([],[])
> return curve
>
> line_ani = animation.FuncAnimation(fig, run,
>data_source, init_func=init,
> fargs=(curve,x_data,y_data), interval=100)
>
> plt.show()
>
>
> Ben was also right in that you could subclass
>FuncAnimation and
> override/extend methods. This would have the benefit of
>giving more
> control over the handling of seek(). (Something else for
>my todo
> list...)
>
> Ryan
>
> --
> Ryan May
> Graduate Research Assistant
> School of Meteorology
> University of Oklahoma
Hi Ryan,
is it possible to autoscale the axes whenever it is needed
by a new chunk of data ?
Nils
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