pyQt Matplotlib小部件实时数据更新 [英] pyQt Matplotlib widget live data updates

问题描述

使用pyQt 4.8.5在Python 2.7中编写:

Writing in Python 2.7 using pyQt 4.8.5:

如何在pyQt中实时更新Matplotlib小部件? 目前，我正在采样数据(目前为random.gauss)，并将其附加并绘制-您可以看到我每次都在清除数据并为每个调用重新绘图:

How may I update a Matplotlib widget in real time within pyQt? Currently I'm sampling data (random.gauss for now), appending this and plotting - you can see that I'm clearing the figure each time and re-plotting for each call:

def getData(self):
    self.data = random.gauss(10,0.1)
    self.ValueTotal.append(self.data)
    self.updateData()

def updateData(self):
    self.ui.graph.axes.clear()
    self.ui.graph.axes.hold(True)
    self.ui.graph.axes.plot(self.ValueTotal,'r-')
    self.ui.graph.axes.grid()
    self.ui.graph.draw()

我的GUI工作正常，虽然我认为这是实现效率低下的错误方法，但我认为我应该在绘图时使用动画调用"(?)，尽管我不知道该怎么做.

My GUI works though I think this is the wrong way to achieve this as its highly inefficient, I believe I should use the 'animate call'(?) whilst plotting, though I don't know how.

推荐答案

一个想法是在完成第一个绘图后仅更新图形对象. axes.plot应该返回一个Line2D对象，您可以修改其x和y数据:

One idea would be to update only the graphics object after the first plot was done. axes.plot should return a Line2D object whose x and y-data you can modify:

http://matplotlib.org/api/artist_api.html# matplotlib.lines.Line2D.set_xdata

因此，一旦绘制了线条，就不要删除和绘制新的线条，而要修改现有的线条:

So, once you have the line plotted, don't delete and plot a new one, but modify the existing:

def updateData(self):
    if not hasattr(self, 'line'):
        # this should only be executed on the first call to updateData
        self.ui.graph.axes.clear()
        self.ui.graph.axes.hold(True)
        self.line = self.ui.graph.axes.plot(self.ValueTotal,'r-')
        self.ui.graph.axes.grid()
    else:
        # now we only modify the plotted line
        self.line.set_xdata(np.arange(len(self.ValueTotal))
        self.line.set_ydata(self.ValueTotal)
    self.ui.graph.draw()

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