On Wed, Feb 10, 2010 at 12:39 PM, John Jameson
wrote:
> Hi -
> I am wondering how to animate using blit and patches.
> The code below was modified from one of the examples.
> You will see that it shows (and moves) the rectangle just fine, but
> the circle never shows up.
Artists must be added to the axes -- when you do line, = ax.plot(...)
the Line2D object is added t the Axes. But you never add the circle
to the axes. So do
cir = CirclePolygon((x_cir, 1), 0.3, animated=True, resolution=6, lw=2)
ax.add_patch(cir)
and then call
ax.draw_artist(cir)
when you want to draw it.
JDH
> best,
> Jaron
>
>
>
> import gtk, gobject
> import matplotlib
> matplotlib.use('GTKAgg') #Agg rendering to a GTK canvas (requires PyGTK)
> import numpy as np
> import matplotlib.pyplot as plt
> from pylab import *
> from matplotlib.patches import CirclePolygon
>
> fig = plt.figure(figsize=(14,10))
> ax = fig.add_subplot(111, autoscale_on=False )
> canvas = fig.canvas
>
> x_start = array([1.0, 2, 2, 1, 1])
> y_start = array([1.0, 1, 2, 2, 1])
>
> plt.axis([-1, 7, -0.5, 2.2])
>
> def update_line():
> global x, y
> print update_line.cnt
> if update_line.background is None:
> update_line.background = canvas.copy_from_bbox(ax.bbox)
> canvas.restore_region(update_line.background)
>
> x = x_start + 0.012 * update_line.cnt
> y = y_start + 0.0001 * update_line.cnt
> line, = ax.plot(x, y, animated=True, lw=2)
> ax.draw_artist(line)
>
> x_cir = 1.0 + 0.001*update_line.cnt
> cir = CirclePolygon((x_cir, 1), 0.3, animated=True, resolution=6, lw=2
> )
> ax.draw_artist(cir)
>
> canvas.blit(ax.bbox)
>
> if update_line.cnt == 1:
> gtk.mainquit()
> raise SystemExit
> update_line.cnt += 1
> return True
>
> update_line.cnt = 0
> update_line.background = None
>
> def start_anim(event):
> gobject.idle_add(update_line)
> canvas.mpl_disconnect(start_anim.cid)
>
> start_anim.cid = canvas.mpl_connect('draw_event', start_anim)
>
> plt.show()
>
>
>
>
>
> --
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