matplotlib:如何刷新figure.canvas

Question

我无法理解如何刷新FigureCanvasWxAgg实例.这是一个例子:

import wx
import matplotlib
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
from matplotlib.figure import Figure

class MainFrame(wx.Frame): 
    def __init__(self): 
        wx.Frame.__init__(self, None, wx.NewId(), "Main") 
        self.sizer = wx.BoxSizer(wx.VERTICAL)

        self.figure = Figure(figsize=(1,2))
        self.axe = self.figure.add_subplot(111)
        self.figurecanvas = FigureCanvas(self, -1, self.figure)

        self.buttonPlot = wx.Button(self, wx.NewId(), "Plot")
        self.buttonClear = wx.Button(self, wx.NewId(), "Clear")

        self.sizer.Add(self.figurecanvas, proportion=1, border=5, flag=wx.ALL | wx.EXPAND)
        self.sizer.Add(self.buttonPlot, proportion=0, border=2, flag=wx.ALL)
        self.sizer.Add(self.buttonClear, proportion=0, border=2, flag=wx.ALL)
        self.SetSizer(self.sizer)

        self.figurecanvas.Bind(wx.EVT_LEFT_DCLICK, self.on_dclick)
        self.buttonPlot.Bind(wx.EVT_BUTTON, self.on_button_plot)
        self.buttonClear.Bind(wx.EVT_BUTTON, self.on_button_clear)

        self.subframe_opened = False

    def on_dclick(self, evt):
        self.subframe = SubFrame(self, self.figure)
        self.subframe.Show(True)
        self.subframe_opened = True

    def on_button_plot(self, evt):
        self.axe.plot(range(10), color='green')
        self.figurecanvas.draw()

    def on_button_clear(self, evt):
        if self.subframe_opened:
            self.subframe.Close()
        self.figure.set_canvas(self.figurecanvas)
        self.axe.clear()
        self.figurecanvas.draw()


class SubFrame(wx.Frame): 
    def __init__(self, parent, figure): 
        wx.Frame.__init__(self, parent, wx.NewId(), "Sub")
        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.figurecanvas = FigureCanvas(self, -1, figure)
        self.sizer.Add(self.figurecanvas, proportion=1, border=5, flag=wx.ALL | wx.EXPAND)
        self.SetSizer(self.sizer)

        self.Bind(wx.EVT_CLOSE, self.on_close)

    def on_close(self, evt):
        self.GetParent().subframe_opened = False
        evt.Skip()



class MyApp(wx.App):
    def OnInit(self):
        frame = MainFrame()
        frame.Show(True)
        self.SetTopWindow(frame)
        return True

app = MyApp(0)
app.MainLoop()    

我对以下操作顺序感兴趣:

• 运行一个脚本
• 调整主框架的大小
• 按Plot按钮
• 双击剧情
• 按清除按钮

现在我在主框架图上弄得一团糟.如果我调整框架大小,它会正确重绘.我的问题是,如果不重新调整大小,我应该在代码中添加什么？

通过"混乱"我的意思是这样的:

http://img227.imageshack.us/img227/5407/mess.png

提前致谢.

Answer 1

正如我在评论中所说,我不认为图形画布刷新是你的问题,事实上我认为它正在做它应该做的事情(基于它的最后状态重新绘制自己[即它在你的子图中]) .我认为你的问题更多的是wxFrame没有刷新.

解决这个问题的最简单方法是让它在"清除"事件上调整大小.就像是:

def on_button_clear(self, evt):
    if self.subframe_opened:
        self.subframe.Close()
    self.figure.set_canvas(self.figurecanvas)
    self.axe.clear()
    self.figurecanvas.draw()  
    self.SetSize((self.Size[0],self.figurecanvas.Size[1]))

设置的大小将导致框架及其包含的所有控件被重绘.

也就是说,我认为在两个图形扫描之间分享你的身材是危险的.通过点击/调整不同组合的内容,我能够产生一些严重的错误.有时,当子框架关闭时,您的图形将被垃圾收集,使其无法用于主框架.