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我在 wxPython 中绘制数据时遇到问题 - 下面的代码有效，但并不完全正确：现在我绘制随机数，它是输入框的倍数，每 100 毫秒完成一次。

我的问题是，整个数字历史都显示为姿势是（比如说）25 个样本的运行窗口。我最初尝试在每个 100 个样本的集合上重新绘制图表，类似于，if( length(data)%100 ): drawGraph但这看起来也不正确。

欢迎提出想法和建议。

我的代码：

print( "\n- Please Wait -- Importing Matplotlib and Related Modules...\n" )
import random
import matplotlib
import numpy
import wx
import u3
import numpy as np
matplotlib.use('WXAgg')

from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
from matplotlib.backends.backend_wx import NavigationToolbar2Wx
from matplotlib.figure import Figure


class TemperaturePanel( wx.Panel ) :
    def __init__( self, parent, position ) :
        wx.Panel.__init__( self, parent, pos=position, size=(800,320) )
        # initialize matplotlib 
        self.figure = matplotlib.figure.Figure( None, facecolor="white" )
        self.canvas = matplotlib.backends.backend_wxagg.FigureCanvasWxAgg( self, -1, self.figure )
        self.axes = self.figure.add_subplot(111)
        self.axes.grid(True, color="gray")
        self.axes.set_xbound( (0,5) )
        self.axes.set_ybound( (3,80) )
        self.axes.set_xlabel( "Minutes" )
        self.axes.set_ylabel( "Temperature ($^\circ$C)" )
        self.axes = self.figure.add_subplot(111)
        self.axes.grid(True, color="gray")
        self._SetSize()
        self.Bind( wx.EVT_SIZE, self._SetSize )
        self.TemperatureData   = []

    def updateTemperature(self, value):
        self.TemperatureData.append( value )
        length = len(self.TemperatureData)
        x = np.arange( length )
        y = np.array(self.TemperatureData)

        yMin = round(min(y)) - 2
        yMax = round(max(y)) + 2            
        self.axes.plot(x,y, "-k")
        self.axes.set_ybound( (yMin,yMax) )
        self.canvas = FigureCanvas(self, -1, self.figure)

    #-----------------------------------------------------------------------------------
    def _SetSize( self, event=None ):
        pixels = self.GetSize()
        self.SetSize( pixels )
        self.canvas.SetSize( pixels )

        dpi = self.figure.get_dpi()
        self.figure.set_size_inches( float( pixels[0] ) / dpi,float( pixels[1] ) / dpi )
    #------------------------------------------------------------------------------------




class MainWindow(wx.Frame):
    def __init__(self, parent):
        #wx.Frame.__init__(self, *args, **kwargs)
        wx.Frame.__init__(self, parent, title="Graph Issue", size=(1000,600))
        self.panel = wx.Panel(self)
        self.spin = wx.SpinCtrl(self.panel)
        self.button = wx.Button(self.panel, label="Update")
        self.stop   = wx.Button(self.panel, label="Stop")

        self.sizer = wx.BoxSizer()
        self.sizer.Add(self.spin)
        self.sizer.Add(self.button)
        self.sizer.Add(self.stop)

        self.TemperatureGraph = TemperaturePanel( self, position=(20, 50) )
        self.panel.SetSizerAndFit(self.sizer)
        self.Show()

        # Use EVT_CHAR_HOOK on Frame insted of wx.EVT_KEY_UP on SpinCtrl
        # to disable "on Enter go to next widget" functionality
        self.Bind(wx.EVT_CHAR_HOOK, self.OnKey) 
        self.button.Bind(wx.EVT_BUTTON, self.OnUpdate)
        self.stop.Bind(wx.EVT_BUTTON, self.OnStop)

        self.timer = wx.Timer(self)
        self.Bind(wx.EVT_TIMER, self.OnTimer, self.timer)
        self.Bind(wx.EVT_TIMER, self.updateTemperature, self.timer)
        self.timer.Start(100)
        self.value = 0

    def OnKey(self, e):
        if e.GetKeyCode() == wx.WXK_RETURN:   # Is the key ENTER?
            self.value = self.spin.GetValue() # Read SpinCtrl and set internal value
        else:                                 # Else let the event out of the handler
            e.Skip()

    def OnUpdate(self, e):
        self.value = self.spin.GetValue() # Read SpinCtrl and set internal value

    def OnTimer(self, e):
        # Show internal value
        print(self.value)

    def updateTemperature(self, e):
        Temperature       = self.value*random.uniform(-1,1)                # obtain currnt temperature
        self.TemperatureGraph.updateTemperature(Temperature)               # add temperature to graph   

    def OnStop(self, e):
        self.timer.Stop()
        self.Destroy()


app = wx.App(False)
win = MainWindow(None)
app.MainLoop()
4

1 回答 1

1

如果我正确理解了这个问题，您只需要在图表中显示 25 个最后的温度值，而不是所有值的历史记录。如果这是您想要的，那么在updateTemperature子例程中只应绘制最后 25 个值：

if length < 25:
    x = np.arange(length)
    y = np.array(self.TemperatureData)
else:
    x = np.arange(length-25, length)
    y = np.array(self.TemperatureData)[-25:]

为了使绘图看起来更好，可以像使用 y 轴一样调整 x 轴：

xMin = 0 if length < 25 else length-25
xMax = 25 if length < 25 else length
self.axes.set_xbound( (xMin,xMax) )

如果该图对您来说看起来不错，并且问题是内存泄漏导致图形在约 200 次迭代后冻结，那是由于FigureCanvas每次温度更新时都会创建。相反，您可以重新使用现有的FigureCanvas，将最后一行更改updateTemperature为

    self.canvas.draw()
于 2013-01-22T06:15:52.143 回答