I'm using the Player class as found at Managing dynamic plotting in matplotlib Animation module to create an animation and can't figure out how to modify the initial values to prevent the animation from starting automatically. Below is the code for Player, along with a simple example, where I graph the unit circle and have arrows tracing out the unit circle as the frames advance:
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.animation import FuncAnimation
from mpl_toolkits.axes_grid1 import make_axes_locatable
import mpl_toolkits
import matplotlib.widgets
from matplotlib.figure import Figure
class Player(FuncAnimation):
def __init__(self, fig, func, frames=None, init_func=None,
fargs=None,save_count=None, mini=0, maxi=100, pos=(0.125, 0.92), **kwargs):
self.i = 0
self.min=mini
self.max=maxi
self.runs = True
self.forwards = True
self.fig = fig
self.func = func
self.setup(pos)
FuncAnimation.__init__(self,self.fig, self.func, frames=self.play(),
init_func=init_func, fargs=fargs,
save_count=save_count,interval=500, **kwargs )
def play(self):
while self.runs:
self.i = self.i+self.forwards-(not self.forwards)
if self.i > self.min and self.i < self.max:
yield self.i
else:
self.stop()
yield self.i
def start(self):
if self.i==self.max:
self.i=0
self.runs=True
self.event_source.start()
def stop(self, event=None):
self.runs = False
self.event_source.stop()
def forward(self, event=None):
self.forwards = True
self.start()
def backward(self, event=None):
self.forwards = False
self.start()
def oneforward(self, event=None):
if self.i==self.max:
self.i=0
self.forwards = True
self.onestep()
def onebackward(self, event=None):
self.forwards = False
self.onestep()
def onestep(self):
if self.i > self.min and self.i < self.max:
self.i = self.i+self.forwards-(not self.forwards)
elif self.i == self.min and self.forwards:
self.i+=1
elif self.i == self.max and not self.forwards:
self.i-=1
self.func(self.i)
self.fig.canvas.draw_idle()
def setup(self, pos):
playerax = self.fig.add_axes([0.4, 0.92, 0.22, 0.03])
divider = mpl_toolkits.axes_grid1.make_axes_locatable(playerax)
bax = divider.append_axes("right", size="80%", pad=0.05)
sax = divider.append_axes("right", size="80%", pad=0.05)
fax = divider.append_axes("right", size="80%", pad=0.05)
ofax = divider.append_axes("right", size="100%", pad=0.05)
self.button_oneback = matplotlib.widgets.Button(playerax , label=u'$\u29CF$')
self.button_back = matplotlib.widgets.Button(bax, label=u'$\u25C0$')
self.button_stop = matplotlib.widgets.Button(sax, label=u'$\u25A0$')
self.button_forward = matplotlib.widgets.Button(fax, label=u'$\u25B6$')
self.button_oneforward = matplotlib.widgets.Button(ofax, label=u'$\u29D0$')
self.button_oneback.on_clicked(self.onebackward)
self.button_back.on_clicked(self.backward)
self.button_stop.on_clicked(self.stop)
self.button_forward.on_clicked(self.forward)
self.button_oneforward.on_clicked(self.oneforward)
######## EXAMPLE ##################
#######################################
fig, ax = plt.subplots()
t=np.linspace(0,1, num=100)
unit_circle_x=np.cos(2*np.pi*t)
unit_circle_y=np.sin(2*np.pi*t)
ax.plot(unit_circle_x,unit_circle_y)
ax.set_xlim(-1.2, 1.2)
ax.set_ylim(-1.2,1.2)
# arrow tracing out unit circle
n=3
unit_vector_x=np.cos(2*np.pi*n*t)
unit_vector_y=np.sin(2*np.pi*n*t)
unit_circle_vector=ax.quiver(0, 0, unit_vector_x[0], unit_vector_y[0], angles='xy', scale_units='xy', scale=1,headwidth=10)
ax.set_aspect("equal")
def update(i):
unit_circle_vector.set_UVC(unit_vector_x[i],unit_vector_y[i])
ax.set_xlabel(r'$i= $'+str(i),rotation=0,labelpad=10)
ani = Player(fig, update, maxi=len(t)-1)
plt.show()
