wxPython实现画图板

#coding:GBK
'''
Created on 2012-3-22
@author: cWX53049
'''
import wx
import time
from bsddb.test.test_pickle import cPickle
import os
 
_formatStr="%Y-%m-%d %H:%M:%S"
 
class SkethWindow(wx.Window):
 
 
 def __init__(self,parent,ID):
  wx.Window.__init__(self,parent,ID)
  self.SetBackgroundColour("White")
  self.color="Black"
  self.thickness=1
  self.pen=wx.Pen(self.color,self.thickness,wx.SOLID)#创建一个pen
  self.lines=[]
  self.curLine=[]
  self.pos=(0,0)
  self.InitBuffer()
  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_SIZE, self.OnSize)
  self.Bind(wx.EVT_IDLE,self.OnIdle)
  self.Bind(wx.EVT_PAINT, self.OnPaint)
 def InitBuffer(self):
  size = self.GetClientSize()
  self.buffer=wx.EmptyBitmap(size.width,size.height)
  dc = wx.BufferedDC(None,self.buffer)
  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=[] 
  self.pos=event.GetPositionTuple()#得到鼠标的位置
  self.CaptureMouse()#捕获鼠标
 def OnLeftUp(self,event):
  if self.HasCapture():
   self.lines.append((self.color,
        self.thickness,
        self.curLine))
   self.curLine=[]
   self.ReleaseMouse()#释放鼠标
 def OnMotion(self,event):
  if event.Dragging() and event.LeftIsDown():#确定是否在拖动
   dc = wx.BufferedDC(wx.ClientDC(self),self.buffer)#创建另一个
   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#处理一个resize事件
 def OnIdle(self,event):
  if self.reInitBuffer:
   self.InitBuffer()
   self.Refresh()
 def OnPaint(self,event):
  wx.BufferedPaintDC(self,self.buffer)
 def DrawLines(self,dc):
  for colur,thickness,line in self.lines:
   pen = wx.Pen(colur,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 SkethFrame(wx.Frame):
 def __init__(self,parent):
  self.title="绘画窗体"
  wx.Frame.__init__(self,parent,-1,self.title,size=(500,500))
  self.sketh=SkethWindow(self,-1)
  self.InitStatusBar()
  self.sketh.Bind(wx.EVT_MOTION, self.showPosition)
  self.initMenuBar()
  self.wildcard="Sketch file(*.sketch)|All files(*.*)|*.*"
  self.fileName=""
  
 def OnNew(self,event):
  pass
 def OnOpen(self,event):
  pass
 def OnSave(self,event):
  if not self.fileName:
   self.OnSaveAs(event)
  else:
   self.SaveFile()
   
 def SaveFile(self):
  if self.fileName:
   data = self.sketh.GetLinesData()
   f = open(self.fileName,'w') 
   cPickle.dump(data, f)
   f.close()
 def OnSaveAs(self,event):
  dlf = wx.FileDialog(self,"Sketch file",os.getcwd(),style=wx.SAVE|wx.OVERWRITE_PROMPT)
  if dlf.ShowModal()==wx.ID_OK:
   fileName = dlf.GetPath()
   if not os.path.splitext(fileName)[1]:
    fileName=fileName+'.sketch'
    self.fileName=fileName 
    self.SaveFile()
  self.SetTitle(self.title+'--'+self.fileName)
  dlf.Destroy()      
 def OnColor(self,event):
  pass
 def OnCloseWindow(self,event):
  self.Destroy() 
 def menuData(self):
  return [("&File",(
     ("&New","New Sketch file",self.OnNew),
     ("&Open","open sketch file",self.OnOpen),
     ("&Save","save sktech file",self.OnSave),
     ("","",""),
     ("&Color",(
     ("&Black","",self.OnColor,wx.ITEM_RADIO),
     ("&Red","",self.OnColor,wx.ITEM_RADIO),
     ("&Red","",self.OnColor,wx.ITEM_RADIO),
     ("&Blue","",self.OnColor,wx.ITEM_RADIO))),
     ("","",""),
     ("&Quit","quit sketch ",self.OnCloseWindow)))] 
 
 def initMenuBar(self):
  menuBar=wx.MenuBar()
  for eachMenu in self.menuData():
   eachMenuLabel = eachMenu[0]
   eachMenuItems = eachMenu[1]
   menuBar.Append(self.createMenu(eachMenuItems),eachMenuLabel)
  self.SetMenuBar(menuBar)  
  
 def createMenu(self,menuData):
  menu = wx.Menu()
  for eachMenu in menuData:
   if len(eachMenu)==2:
    label = eachMenu[0]
    subBar =self.createMenu(eachMenu[1]) 
    menu.AppendMenu(wx.NewId(),label,subBar)
   else:
    self.createMenuItem(menu,*eachMenu)
  return menu
 
 def createMenuItem(self,menu,label,status,handler,kind=wx.ITEM_NORMAL):
  if not label:
   menu.AppendSeparator()
   return
  menuItem=menu.Append(-1,label,status,kind)
  self.Bind(wx.EVT_MENU,handler,menuItem)  
   
   
 def InitStatusBar(self):
  self.statusBar=self.CreateStatusBar()
  self.statusBar.SetFieldsCount(4)
  self.statusBar.SetStatusWidths([-1,-2,-2,-2])
  self.timer=wx.Timer(self)
  self.Bind(wx.EVT_TIMER, self.updateTime, self.timer)
  self.timer.Start(1000)
  self.statusBar.SetStatusText("Time is %s"%time.strftime(_formatStr,time.localtime()),3)
  self.statusBar.SetStatusText("Pos (0,0)",1)
  self.statusBar.SetStatusText("Cur Line 0",2)
  self.statusBar.SetStatusText("Lines 0" ,3)
  
  
 def showPosition(self,event):
  self.statusBar.SetStatusText("Pos %s"%str(event.GetPositionTuple()),0)
  self.statusBar.SetStatusText("Cur Line %s"%len(self.sketh.curLine),1)
  self.statusBar.SetStatusText("Lines %s"%len(self.sketh.lines),2)
  event.Skip() 
   
 def updateTime(self,event):
  self.statusBar.SetStatusText("Time is %s"%time.strftime(_formatStr,time.localtime()),3)
   
   
if __name__=="__main__":
 app = wx.PySimpleApp(False)
 frame=SkethFrame(None)
 frame.Center()
 frame.Show(True)
 app.MainLoop()