On Wed, Feb 10, 2010 at 12:39 PM, John Jameson
jjame...@altoresearch.com 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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Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
http://p.sf.net/sfu/solaris-dev2dev
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