Show animation_blit_fltk.py syntax highlighted
import sys
import fltk
import matplotlib
matplotlib.use('FltkAgg')
import pylab as p
import matplotlib.numerix as nx
import time
# save the clean slate background -- everything but the animated line
# is drawn and saved in the pixel buffer background
class animator:
def __init__(self,ax):
self.ax=ax
self.canvas=ax.figure.canvas
self.canvas.mpl_connect('draw_event',self.clear)
self.cnt=0
self.background=None
# for profiling
self.tstart = time.time()
def clear(self,event):
self.background = self.canvas.copy_from_bbox(self.ax.bbox)
def update(self,ptr):
# restore the clean slate background
if self.background is None:
self.background = self.canvas.copy_from_bbox(self.ax.bbox)
self.canvas.restore_region(self.background)
# update the data
line.set_ydata(nx.sin(x+self.cnt/10.0))
# just draw the animated artist
self.ax.draw_artist(line)
# just redraw the axes rectangle
self.canvas.blit(ax.bbox)
self.cnt+=1
if self.cnt==1000:
# print the timing info and quit
print 'FPS:' , 1000/(time.time()-self.tstart)
sys.exit()
return True
ax = p.subplot(111)
p.subplots_adjust(left=0.3, bottom=0.3) # check for flipy bugs
p.grid() # to ensure proper background restore
# create the initial line
x = nx.arange(0,2*nx.pi,0.01)
line, = p.plot(x, nx.sin(x), animated=True)
p.draw()
anim=animator(ax)
fltk.Fl.add_idle(anim.update)
fltk.Fl.run()
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