wxPython FloatCanvas 事件绑定

Question

我正在使用 Python 3.6 和 wxPython 4.1.0 gtk3 (phoenix) wxWidgets 3.1.4。 在我尝试 plot 的每 4 行绑定 function 有一个延迟，大约 12 行后程序崩溃。 通常，我的代码使用网格来输入线条的点，但附加的代码会在单击 Draw 按钮后生成数据，效果完全相同。 第 4 行的延迟约为 2.5 秒，通常需要约 1 秒到 plot 一行。 我已经为绑定调用尝试了两个函数，一个使用事件，另一个调用 object。 如果有人知道解决方法，请告诉我。

import time
import string
import wx
from wx.lib.floatcanvas import NavCanvas, FloatCanvas
import wx.lib.colourdb


class InputForm(wx.Frame):
    '''set up the form and draw axis'''
    def __init__(self):
        super(InputForm, self).__init__(None, wx.ID_ANY, title='Plot Lines', size=(1300, 830))

        # set dictionary of points; key node letter, value tuple of point,
        self.pts = {}

        # create the form level sizer
        Main_Sizer = wx.BoxSizer(wx.HORIZONTAL)

        # add the sizer for the left side widgets
        sizerL = wx.BoxSizer(wx.VERTICAL)
        # add the grid and then set it ot he left panel

        btnsizer = wx.BoxSizer(wx.HORIZONTAL)
        drw = wx.Button(self, -1, "Draw\nLines")
        btnsizer.Add(drw, 0, wx.ALL|wx.ALIGN_CENTER, 5)

        # bind the button events to handlers
        self.Bind(wx.EVT_BUTTON, self.OnDraw, drw)

        sizerL.Add((10, 20))
        sizerL.Add(btnsizer, 1, wx.ALIGN_CENTER)

        # add the draw panel
        rght = NavCanvas.NavCanvas(self,
                                   ProjectionFun=None,
                                   Debug=0,
                                   BackgroundColor="LIGHT GREY",
                                   )
        self.Canvas = rght.Canvas

        self.InitCanvas()

        Main_Sizer.Add(sizerL, 0, wx.EXPAND)
        Main_Sizer.Add((10, 10))
        Main_Sizer.Add(rght, 1, wx.EXPAND)
        self.SetSizer(Main_Sizer)

    def InitCanvas(self):
        # add the x & y axis
        self.Canvas.AddLine([(0, 0), (0, 5)], LineWidth=2, LineColor='Yellow')
        self.Canvas.AddLine([(0, 0), (5, 0)], LineWidth=2, LineColor='Green')
        origin = self.Canvas.AddScaledTextBox('origin', (0, 0),
                                              Color='blue',
                                              Size=.5,
                                              PadSize=0,
                                              Width=None,
                                              LineColor=None,
                                              Family=wx.MODERN,
                                              Position='tr',
                                              Alignment='bottom',
                                              InForeground=True)
        # first Bind of node to EvtLeftDown
        origin.Bind(FloatCanvas.EVT_FC_LEFT_DOWN,
                    lambda evt, selctEnd='Origin':
                    self.EvtLeftDown(evt, 'Origin'))

        wx.CallAfter(self.Canvas.ZoomToBB)

    def OnDraw(self, evt):
        pts1 = (0, 0)
        
        x = [i for i in range(5, 30, 2)]
        y = x[::-1]
        pts2 = [(x[i], y[i]) for i in range(0, len(x))]
        alph = string.ascii_uppercase

        LnLbls = [alph[i] for i in range(0, len(x))]

        New_EndPt = True
        n = 0
        for pt in pts2:
            points = []
            points.append(pts1)
            points.append(pt)
            LnLbl = LnLbls[n]
            New_EndPt = True
            n += 1
            self.DrawLine(points, LnLbl, New_EndPt)

    def DrawLine(self, points, LnLbl, New_EndPt):
        '''Draws the line object as specified in the VarifyData() function'''

        # label the end point of the line in lower case
        if New_EndPt is True:
            new_end = self.Canvas.AddScaledTextBox(LnLbl.lower(), tuple(points[1]),
                                                   Color='black',
                                                   Size=.5,
                                                   PadSize=.2,
                                                   Width=None,
                                                   LineColor=None,
                                                   Family=wx.MODERN,
                                                   Position='cc',
                                                   Alignment='bottom',
                                                   InForeground=True)

            new_end.Bind(FloatCanvas.EVT_FC_LEFT_DOWN,
                         lambda evt, selctEnd=LnLbl.lower():
                         self.EvtLeftDown(evt, selctEnd))

        # define the new line
        self.Canvas.AddLine(points, LineWidth=2, LineColor='red')
        # add the new line to the list of lines

        self.Canvas.AddPoint(tuple(points[1]), 'black', 8)

        # locate the center of the new line for the label location
        lncntr = ((int(points[0][0])+int(points[1][0]))//2,
                  (int(points[0][1])+int(points[1][1]))//2)

        # place the new line lable
        new_line = self.Canvas.AddScaledTextBox(LnLbl, lncntr,
                                                Color='red',
                                                Size=.5,
                                                PadSize=None,
                                                Width=None,
                                                LineColor=None,
                                                Family=wx.MODERN,
                                                Position='tc',
                                                Alignment='bottom',
                                                InForeground=True)
        new_line.Name = LnLbl

        tic = time.perf_counter()
        new_line.Bind(FloatCanvas.EVT_FC_LEFT_DOWN, self.ObjLeftDown)
        toc = time.perf_counter()
        print(f'time to execute BIND function for DrawLine line 136 = {toc-tic:0.2f}')

        wx.CallAfter(self.Canvas.ZoomToBB)

    def ObjLeftDown(self, object):
        lbl = object.Name

        if lbl == 'Origin':
            self.Node(lbl)
        elif 65 <= ord(lbl) <= 90:
            print('you have selected line ', lbl)
        elif 97 <= ord(lbl) <= 122:
            print('you have selected node ', lbl)

    def EvtLeftDown(self, evt, lbl):
        if lbl == 'Origin':
            print('you have selected the origin')
        elif 97 <= ord(lbl) <= 122:
            print('you have selected node ', lbl)

# Run the program
if __name__ == "__main__":
    app = wx.App(False)
    frame = InputForm()
    frame.Center()
    frame.Show()
    app.MainLoop()

Answer 1

通过对您的代码进行细微调整，我无法复制您所指的delays 。
无论我重新画线多少次，时间总是在大致相同的时间范围内。
绑定是针对不同的对象，它只是将一个事件绑定到 object，所以我怀疑这是问题所在。

import time
import string
import wx
from wx.lib.floatcanvas import NavCanvas, FloatCanvas
import wx.lib.colourdb


class InputForm(wx.Frame):
    '''set up the form and draw axis'''
    def __init__(self):
        super(InputForm, self).__init__(None, wx.ID_ANY, title='Plot Lines', size=(1300, 830))

        # set dictionary of points; key node letter, value tuple of point,
        self.pts = {}
        self.draw_repetitions = 0
        # create the form level sizer
        Main_Sizer = wx.BoxSizer(wx.HORIZONTAL)

        # add the sizer for the left side widgets
        sizerL = wx.BoxSizer(wx.VERTICAL)
        # add the grid and then set it ot he left panel

        btnsizer = wx.BoxSizer(wx.HORIZONTAL)
        drw = wx.Button(self, -1, "Draw\nLines")
        btnsizer.Add(drw, 0, wx.ALL|wx.ALIGN_CENTER, 5)

        # bind the button events to handlers
        self.Bind(wx.EVT_BUTTON, self.OnDraw, drw)

        sizerL.Add((10, 20))
        sizerL.Add(btnsizer, 1, wx.ALIGN_CENTER)

        # add the draw panel
        self.rght = NavCanvas.NavCanvas(self,
                                   ProjectionFun=None,
                                   Debug=0,
                                   BackgroundColor="LIGHT GREY",
                                   )
        #self.Canvas = self.rght.Canvas

        self.InitCanvas()

        Main_Sizer.Add(sizerL, 0, wx.EXPAND)
        Main_Sizer.Add((10, 10))
        Main_Sizer.Add(self.rght, 1, wx.EXPAND)
        self.SetSizer(Main_Sizer)

    def InitCanvas(self):
        # add the x & y axis
        self.Canvas = self.rght.Canvas
        self.Canvas.ClearAll()
        self.Canvas.AddLine([(0, 0), (0, 5)], LineWidth=2, LineColor='Yellow')
        self.Canvas.AddLine([(0, 0), (5, 0)], LineWidth=2, LineColor='Green')
        origin = self.Canvas.AddScaledTextBox('origin', (0, 0),
                                              Color='blue',
                                              Size=.5,
                                              PadSize=0,
                                              Width=None,
                                              LineColor=None,
                                              Family=wx.MODERN,
                                              Position='tr',
                                              Alignment='bottom',
                                              InForeground=True)
        # first Bind of node to EvtLeftDown
        origin.Bind(FloatCanvas.EVT_FC_LEFT_DOWN,
                    lambda evt, selctEnd='Origin':
                    self.EvtLeftDown(evt, 'Origin'))

        wx.CallAfter(self.Canvas.ZoomToBB)

    def OnDraw(self, evt):
        self.InitCanvas()
        pts1 = (0, 0)
        
        x = [i for i in range(5, 30, 2)]
        y = x[::-1]
        pts2 = [(x[i], y[i]) for i in range(0, len(x))]
        alph = string.ascii_uppercase

        LnLbls = [alph[i] for i in range(0, len(x))]

        New_EndPt = True
        n = 0
        for pt in pts2:
            points = []
            points.append(pts1)
            points.append(pt)
            LnLbl = LnLbls[n]
            New_EndPt = True
            n += 1
            self.DrawLine(points, LnLbl, New_EndPt)

    def DrawLine(self, points, LnLbl, New_EndPt):
        '''Draws the line object as specified in the VarifyData() function'''
        self.draw_repetitions += 1
        # label the end point of the line in lower case
        if New_EndPt is True:
            new_end = self.Canvas.AddScaledTextBox(LnLbl.lower(), tuple(points[1]),
                                                   Color='black',
                                                   Size=.5,
                                                   PadSize=.2,
                                                   Width=None,
                                                   LineColor=None,
                                                   Family=wx.MODERN,
                                                   Position='cc',
                                                   Alignment='bottom',
                                                   InForeground=True)

            new_end.Bind(FloatCanvas.EVT_FC_LEFT_DOWN,
                         lambda evt, selctEnd=LnLbl.lower():
                         self.EvtLeftDown(evt, selctEnd))

        # define the new line
        self.Canvas.AddLine(points, LineWidth=2, LineColor='red')
        # add the new line to the list of lines

        self.Canvas.AddPoint(tuple(points[1]), 'black', 8)

        # locate the center of the new line for the label location
        lncntr = ((int(points[0][0])+int(points[1][0]))//2,
                  (int(points[0][1])+int(points[1][1]))//2)

        # place the new line lable
        new_line = self.Canvas.AddScaledTextBox(LnLbl, lncntr,
                                                Color='red',
                                                Size=.5,
                                                PadSize=None,
                                                Width=None,
                                                LineColor=None,
                                                Family=wx.MODERN,
                                                Position='tc',
                                                Alignment='bottom',
                                                InForeground=True)
        new_line.Name = LnLbl

        tic = time.perf_counter()
        new_line.Bind(FloatCanvas.EVT_FC_LEFT_DOWN, self.ObjLeftDown)
        toc = time.perf_counter()
        print(f'time to execute BIND function for DrawLine line ',LnLbl, toc-tic)
        print(f'Draw repetitions ',self.draw_repetitions)

       # wx.CallAfter(self.Canvas.ZoomToBB)
        self.Canvas.ZoomToBB()

    def ObjLeftDown(self, object):
        lbl = object.Name

        if lbl == 'Origin':
            self.Node(lbl)
            print(dir(self.Node))
        elif 65 <= ord(lbl) <= 90:
            print('you have selected line ', lbl)
        elif 97 <= ord(lbl) <= 122:
            print('you have selected node ', lbl)

    def EvtLeftDown(self, evt, lbl):
        if lbl == 'Origin':
            print('you have selected the origin')
        elif 97 <= ord(lbl) <= 122:
            print('you have selected node ', lbl)
#        try:
#            evt.Skip()
#        except:
#            pass

# Run the program
if __name__ == "__main__":
    app = wx.App(False)
    frame = InputForm()
    frame.Center()
    frame.Show()
    app.MainLoop()

Answer 2

TL;DR ：作为一种解决方法，不要在 venv 中通过 pip 安装 wxpython，而是安装 ubuntu ZEFE90A8E604A7C840E88D03A6gtF6B7D8Z python3-wxk 。

我面临着你遇到的同样的问题——至少我认为这是同样的问题——并且在某种程度上能够解决它。 运行 Saxony 的 Rolf 在答案中提供的代码，程序在尝试绘制第 12 条左右的线时会冻结几分钟。 然而，几分钟后，我至少得到了一个例外：

    Traceback (most recent call last):
  File "/bug_test.py", line 92, in OnDraw
    self.DrawLine(points, LnLbl, New_EndPt)
  File "/bug_test.py", line 138, in DrawLine
    new_line.Bind(FloatCanvas.EVT_FC_LEFT_DOWN, self.ObjLeftDown)
  File "/env/lib/python3.8/site-packages/wx/lib/floatcanvas/FCObjects.py", line 236, in Bind
    self.HitColor = next(self._Canvas.HitColorGenerator)
StopIteration

对我来说，这看起来像是命中颜色的生成问题。 我猜生成它的迭代器由于某种原因无法提供足够的命中颜色，因此几乎永远运行。 虽然很有趣，但这无助于解决问题。 离开我的虚拟环境有帮助。 最初，我在 venv 中运行所有内容，并通过 pip 安装了 wxpython。 当我离开 venv 并通过 ubuntu package python3-wxgtk4.0 安装 wxpython 时，一切都按预期工作。 所以这是我找到的解决方法。 尽管如此，venv内部的问题仍然存在。 我怀疑它可能与通过 pip 安装有关，它从源代码构建 wxpython。