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下面的代碼應該創建一個包含「校準」按鈕和畫布的窗口。當點擊「校準」按鈕時，應該在畫布上的隨機位置重新繪製紅點。wxPython：在面板更新上未調用的onPaint事件
取而代之，我看到OnPaint事件在開始時被調用一次，而不是之後。任何想法發生了什麼？
import wx
import datetime
import threading
import random
class frmMain (wx.Frame):
def __init__(self, parent):
wx.Frame.__init__ (self, parent, id = wx.ID_ANY, title = wx.EmptyString, pos = wx.DefaultPosition, size = wx.Size(839,553), style = wx.DEFAULT_FRAME_STYLE|wx.TAB_TRAVERSAL)
self.pos = (300,100)
self.initGUI()
def initGUI(self):
self.SetSizeHintsSz(wx.DefaultSize, wx.DefaultSize)
topSizer = wx.BoxSizer(wx.HORIZONTAL)
buttonsSizer = wx.BoxSizer(wx.VERTICAL)
self.btnCalibrate = wx.Button(self, wx.ID_ANY, u"Calibrate", wx.DefaultPosition, wx.DefaultSize, 0)
buttonsSizer.Add(self.btnCalibrate, 0, wx.ALL, 5)
topSizer.Add(buttonsSizer, 0, wx.LEFT, 5)
sizeCanvas = wx.BoxSizer(wx.VERTICAL)
sizeCanvas.SetMinSize(wx.Size(600,600))
self.panel=wx.Panel(self, size=(600,600))
self.panel.SetBackgroundColour('white')
self.firstpoint=wx.Point(300,300)
self.secondpoint=wx.Point(400,400)
self.panel.Bind(wx.EVT_PAINT, self.onPaint)
sizeCanvas.Add(self.panel, 0, wx.ALIGN_LEFT, 5)
topSizer.Add(sizeCanvas, 1, wx.ALIGN_RIGHT, 5)
self.SetSizer(topSizer)
self.Layout()
self.Centre(wx.BOTH)
# Connect Events
self.btnCalibrate.Bind(wx.EVT_BUTTON, self.StartCalibrate)
self.Show(True)
def onPaint(self,event):
print "lalal"
dc = wx.WindowDC(self.panel)
color = wx.Colour(255,0,0)
b = wx.Brush(color)
dc.SetBrush(b)
dc.DrawCircle(self.pos[0], self.pos[1], 10)
def __del__(self):
pass
def StartCalibrate(self, event):
size = self.GetSize()
self.pos = (random.randrange(0, size[0] - 1, 1), random.randrange(0, size[1] - 1, 1))
print "fixation at %d, %d" % (self.pos[0], self.pos[1])
self.panel.Update()
event.Skip()
if __name__ == "__main__":
app = wx.App()
frmMain(None)
app.MainLoop()