在wxpython中有没有一个程序可以让用户选择绘制他想要的任何形状？

import wx

class MyFrame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, title="绘制任意形状示例")
        self.Bind(wx.EVT_PAINT, self.on_paint)
        self.shapes = []

    def on_paint(self, event):
        dc = wx.PaintDC(self)
        gc = wx.GraphicsContext.Create(dc)

        for shape in self.shapes:
            if shape['type'] == 'line':
                gc.SetPen(wx.Pen(shape['color'], shape['thickness']))
                gc.StrokeLine(shape['start'], shape['end'])
            elif shape['type'] == 'rectangle':
                gc.SetPen(wx.Pen(shape['color'], shape['thickness']))
                gc.StrokeRectangle(shape['pos'], shape['size'])
            elif shape['type'] == 'circle':
                gc.SetPen(wx.Pen(shape['color'], shape['thickness']))
                gc.StrokeEllipse(shape['pos'], shape['size'])
            elif shape['type'] == 'polygon':
                gc.SetPen(wx.Pen(shape['color'], shape['thickness']))
                gc.StrokeLines(shape['points'])

    def add_shape(self, shape):
        self.shapes.append(shape)
        self.Refresh()

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

app = MyApp()
app.MainLoop()