Hi,
I am trying to do an animation in two axes (subplots) and I can get it to
work so-so if I do it the "wrong way" but when I do it the "right way" I
don't see anything in my second subplot.
The first subplot (ax1) shows a bunch of moving line segments ("sticks") and
the second one (ax2) shows a low resolution (pixellated) view of the first
subplot. The latter (ax2) uses imshow() but when I update it through
setarray() and blit it onto the canvas it doesn't show up (although the
sticks in the ax1 show up fine). However, if I insert the line canvas.draw()
after the ax2 blit it works but it makes the ax1 animation very jittery.
Can someone tell me the correct way to do this? I'm still a tenderfoot in
Matplotlib ;-(
thanks!
John
class Sticks_animator():
x_offset = 0.0
def __init__(self, n_sticks_tot, n_pixels_horizontal=0,
n_pixels_vertical=0 ):
.
.
.
.
.
def reset(self):
self.background1 = None
self.background2 = None
self.start = 1
def draw_sticks(self):
if self.start:
self.poly = []
for i in range( self.n_sticks_tot):
x_stick = array([ [self.x1[i], self.y1[i]],
[self.x2[i], self.y2[i]] ] )
self.poly.append( Polygon( x_stick, animated=True,
lw=2, fill=False) )
self.ax1.add_patch(self.poly[i])
self.ax1.draw_artist(self.poly[i])
else:
for i in range( self.n_sticks_tot):
x_stick = array([ [self.x1[i], self.y1[i]],
[self.x2[i], self.y2[i]] ] )
self.poly[i].set_xy(x_stick)
self.ax1.draw_artist(self.poly[i])
def draw_retina(self):
if self.start:
self.img = self.ax2.imshow(self.inten, interpolation='nearest')
else:
self.img.set_array(self.inten)
def step_it(self):
self.inten, self.n_sticks_tot, self.x1, self.y1, \
self.x2, self.y2, done = self.stks.Step_it()
# self.stks.Step_it() is finds all the stick coordinates
# and inten is a NXN array of a pixellated (low res) view
# of all the sticks
if self.background1 is None:
self.background1 = self.canvas.copy_from_bbox(self.ax1.bbox)
self.canvas.restore_region(self.background1)
self.draw_sticks()
self.canvas.blit(self.ax1.bbox)
if self.add_retina_view:
self.draw_retina()
self.canvas.blit(self.ax2.bbox)
# self.canvas.draw() IF I UNCOMMENT THIS IT "WORKS"
self.start = 0
if done:
gtk.main_quit()
raise SystemExit
return True
def mainer( self, stks ):
self.stks = stks
if isinteractive():
ioff()
def start_anim(event):
gobject.idle_add( self.step_it )
self.canvas.mpl_disconnect(start_anim.cid)
start_anim.cid = self.canvas.mpl_connect('draw_event', start_anim)
plt.show()
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