wxPython: 简单的绘图例子

一个绘图的例子：

#!/usr/bin/env python
# -*- coding: utf-8 -*-

'''
    Function:绘图
    Input：NONE
    Output: NONE
    author: socrates
    blog:http://www.cnblogs.com/dyx1024/
    date:2012-07-11
'''  

import wx

class PaintWindow(wx.Window):
        def __init__(self, parent, id):
            wx.Window.__init__(self, parent, id)
            self.SetBackgroundColour("Red")
            self.color = "Green"
            self.thickness = 10
        
            #创建一个画笔
            self.pen = wx.Pen(self.color, self.thickness, wx.SOLID)
            self.lines = []
            self.curLine = []
            self.pos = (0, 0)
            self.InitBuffer()
        
            #连接事件
            self.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
            self.Bind(wx.EVT_LEFT_UP, self.OnLeftUp)
            self.Bind(wx.EVT_MOTION, self.OnMotion)
            self.Bind(wx.EVT_SIZE, self.OnSize)
            self.Bind(wx.EVT_IDLE, self.OnIdle)
            self.Bind(wx.EVT_PAINT, self.OnPaint)
        
        def InitBuffer(self):
            size = self.GetClientSize()
            
            #创建缓存的设备上下文
            self.buffer = wx.EmptyBitmap(size.width, size.height)
            dc = wx.BufferedDC(None, self.buffer)
            
            #使用设备上下文
            dc.SetBackground(wx.Brush(self.GetBackgroundColour()))
            dc.Clear()
            self.DrawLines(dc)
            self.reInitBuffer = False
            
        def GetLinesData(self):
            return self.lines[:]
        
        def SetLinesData(self, lines):
            self.lines = lines[:]
            self.InitBuffer()
            self.Refresh()
            
        def OnLeftDown(self, event):
            self.curLine = []
            
            #获取鼠标位置
            self.pos = event.GetPositionTuple()
            self.CaptureMouse()
            
        def OnLeftUp(self, event):
            if self.HasCapture():
                self.lines.append((self.color,
                                   self.thickness,
                                   self.curLine))
                self.curLine = []
                self.ReleaseMouse()
                
        def OnMotion(self, event):
            if event.Dragging() and event.LeftIsDown():
                dc = wx.BufferedDC(wx.ClientDC(self), self.buffer)
                self.drawMotion(dc, event)
            event.Skip()
        
        def drawMotion(self, dc, event):
            dc.SetPen(self.pen)
            newPos = event.GetPositionTuple()
            coords = self.pos + newPos
            self.curLine.append(coords)
            dc.DrawLine(*coords)
            self.pos = newPos
            
        def OnSize(self, event):
            self.reInitBuffer = True
        
        def OnIdle(self, event):
            if self.reInitBuffer:
                self.InitBuffer()
                self.Refresh(False)
        
        def OnPaint(self, event):
            dc = wx.BufferedPaintDC(self, self.buffer)
            
        def DrawLines(self, dc):
            for colour, thickness, line in self.lines:
                pen = wx.Pen(colour, thickness, wx.SOLID)
                dc.SetPen(pen)
                for coords in line:
                    dc.DrawLine(*coords)
        
        def SetColor(self, color):
            self.color = color
            self.pen = wx.Pen(self.color, self.thickness, wx.SOLID)
            
        def SetThickness(self, num):
            self.thickness = num
            self.pen = wx.Pen(self.color, self.thickness, wx.SOLID)
            
class PaintFrame(wx.Frame):
    def __init__(self, parent):
        wx.Frame.__init__(self, parent, -1, "Panit Frame", size = (800, 600))
        self.paint = PaintWindow(self, -1)
        
if __name__ == '__main__':
    app = wx.PySimpleApp()
    frame = PaintFrame(None)
    frame.Show(True)
    app.MainLoop()            
            
        
        
        

测试：