import matplotlib from matplotlib import pyplot as plt from celluloid import Camera
fig = plt.figure() camera = Camera(fig) for i in range(20): t = plt.plot(range(i, i + 5)) plt.legend(t, [f'line {i}']) camera.snap() animation = camera.animate() animation.save('celluloid_legends.gif', writer = 'imagemagick')
通过定时器Timer触发事件,定时更新绘图
这个没开始研究,但是,我确定是我必须要掌握的。
通过定时器Timer触发事件,定时更新绘图,可以形成动态更新图片。下面的实例是学习《matplotlib for python developers》一文的笔记。
#-*-coding:utf-8-*- import wx from matplotlib.figure import Figure import matplotlib.font_manager as font_manager import numpy as np from matplotlib.backends.backend_wxagg import \ FigureCanvasWxAgg as FigureCanvas # wxWidgets object ID for the timer TIMER_ID = wx.NewId() # number of data points POINTS = 300 classPlotFigure(wx.Frame): """Matplotlib wxFrame with animation effect""" def__init__(self): wx.Frame.__init__(self, None, wx.ID_ANY, title="CPU Usage Monitor", size=(600, 400)) # Matplotlib Figure self.fig = Figure((6, 4), 100) # bind the Figure to the backend specific canvas self.canvas = FigureCanvas(self, wx.ID_ANY, self.fig) # add a subplot self.ax = self.fig.add_subplot(111) # limit the X and Y axes dimensions self.ax.set_ylim([0, 100]) self.ax.set_xlim([0, POINTS]) self.ax.set_autoscale_on(False) self.ax.set_xticks([]) # we want a tick every 10 point on Y (101 is to have 10 self.ax.set_yticks(range(0, 101, 10)) # disable autoscale, since we don't want the Axes to ad # draw a grid (it will be only for Y) self.ax.grid(True) # generates first "empty" plots self.user = [None] * POINTS self.l_user,=self.ax.plot(range(POINTS),self.user,label='User %') # add the legend self.ax.legend(loc='upper center', ncol=4, prop=font_manager.FontProperties(size=10)) # force a draw on the canvas() # trick to show the grid and the legend self.canvas.draw() # save the clean background - everything but the line # is drawn and saved in the pixel buffer background self.bg = self.canvas.copy_from_bbox(self.ax.bbox) # bind events coming from timer with id = TIMER_ID # to the onTimer callback function wx.EVT_TIMER(self, TIMER_ID, self.onTimer) defonTimer(self, evt): """callback function for timer events""" # restore the clean background, saved at the beginning self.canvas.restore_region(self.bg) # update the data temp =np.random.randint(10,80) self.user = self.user[1:] + [temp] # update the plot self.l_user.set_ydata(self.user) # just draw the "animated" objects self.ax.draw_artist(self.l_user)# It is used to efficiently update Axes data (axis ticks, labels, etc are not updated) self.canvas.blit(self.ax.bbox) if __name__ == '__main__': app = wx.PySimpleApp() frame = PlotFigure() t = wx.Timer(frame, TIMER_ID) t.Start(50) frame.Show() app.MainLoop()