我有一个奇怪的问题，与 matplotlib 有关。如果我运行这个程序，我可以多次打开和关闭同一个图形。
import numpy
from pylab import figure, show
X = numpy.random.rand(100, 1000)
xs = numpy.mean(X, axis=1)
ys = numpy.std(X, axis=1)
fig = figure()
ax = fig.add_subplot(111)
ax.set_title('click on point to plot time series')
line, = ax.plot(xs, ys, 'o', picker=5) # 5 points tolerance
def onpick(event):
figi = figure()
ax = figi.add_subplot(111)
ax.plot([1,2,3,4])
figi.show()
fig.canvas.mpl_connect('pick_event', onpick)
show()
相反，如果我在自定义小部件中使用相同的 onpick 函数代码，它只会在第一次打开图形，然后进入它进入函数的其他事件，但不显示图形：
from PyQt4 import QtGui, QtCore
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.backends.backend_qt4 import NavigationToolbar2QT as NavigationToolbar
import time
STEP = 0.000152
class MplCanvas(FigureCanvas):
def __init__(self):
# initialization of the canvas
FigureCanvas.__init__(self, Figure())
self.queue = []
self.I_data = np.array([])
self.T_data = np.array([])
self.LvsT = self.figure.add_subplot(111)
self.LvsT.set_xlabel('Time, s')
self.LvsT.set_ylabel('PMT Voltage, V')
self.LvsT.set_title("Light vs Time")
self.LvsT.grid(True)
self.old_size = self.LvsT.bbox.width, self.LvsT.bbox.height
self.LvsT_background = self.copy_from_bbox(self.LvsT.bbox)
self.LvsT_plot, = self.LvsT.plot(self.T_data,self.I_data)
#self.LvsT_plot2, = self.LvsT.plot(self.T_data2,self.I_data2)
self.mpl_connect('axes_enter_event', self.enter_axes)
self.mpl_connect('button_press_event', self.onpick)
self.count = 0
self.draw()
def enter_axes(self,event):
print "dentro"
def onpick(self,event):
print "click"
print 'you pressed', event.canvas
a = np.arange(10)
print a
print self.count
fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot(a)
fig.show()
def Start_Plot(self,q,Vmin,Vmax,ScanRate,Cycles):
self.queue = q
self.LvsT.clear()
self.LvsT.set_xlim(0,abs(Vmin-Vmax)/ScanRate*Cycles)
self.LvsT.set_ylim(-3, 3)
self.LvsT.set_autoscale_on(False)
self.LvsT.clear()
self.draw()
self.T_data = np.array([])
self.I_data = np.array([])
# call the update method (to speed-up visualization)
self.timerEvent(None)
# start timer, trigger event every 1000 millisecs (=1sec)
self.timerLvsT = self.startTimer(3)
def timerEvent(self, evt):
current_size = self.LvsT.bbox.width, self.LvsT.bbox.height
if self.old_size != current_size:
self.old_size = current_size
self.LvsT.clear()
self.LvsT.grid()
self.draw()
self.LvsT_background = self.copy_from_bbox(self.LvsT.bbox)
self.restore_region(self.LvsT_background, bbox=self.LvsT.bbox)
result = self.queue.get()
if result == 'STOP':
self.LvsT.draw_artist(self.LvsT_plot)
self.killTimer(self.timerLvsT)
print "Plot finito LvsT"
else:
# append new data to the datasets
self.T_data = np.append(self.T_data,result[0:len(result)/2])
self.I_data = np.append(self.I_data,result[len(result)/2:len(result)])
self.LvsT_plot.set_data(self.T_data,self.I_data)#L_data
#self.LvsT_plot2.set_data(self.T_data2,self.I_data2)#L_data
self.LvsT.draw_artist(self.LvsT_plot)
self.blit(self.LvsT.bbox)
class LvsT_MplWidget(QtGui.QWidget):
def __init__(self, parent = None):
QtGui.QWidget.__init__(self, parent)
self.canvas = MplCanvas()
self.vbl = QtGui.QVBoxLayout()
self.vbl.addWidget(self.canvas)
self.setLayout(self.vbl)
动画绘图需要这个小部件，当实验完成时，如果我单击绘图，它应该会出现一个图形，该图形仅在第一次出现。
你有什么线索吗？
非常感谢。
