Python实例讲解 -- tkinter canvas (设置背景图片及文字)
先来一个绘图：
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# create a canvas on top of a blank bitmap# any canvas drawings can now be saved to a standard image file# tested with Python27 and wxPython28 by vegaseat 05jan2011import wxclass MyFrame(wx.Frame): def __init__(self, parent=None, id=-1, title=None): wx.Frame.__init__(self, parent, id, title, size=(380,400)) self.statbmp = wx.StaticBitmap(self) self.draw_image() self.save_image() def draw_image(self): # select the width and height of the blank bitmap # should fit the client frame w, h = 340, 340 # create the blank bitmap as a draw background draw_bmp = wx.EmptyBitmap(w, h) # create the canvas on top of the draw_bmp canvas_dc = wx.MemoryDC(draw_bmp) # fill the canvas white canvas_dc.SetBrush(wx.Brush('white')) canvas_dc.Clear() # draw a bunch of circles ... # pen colour canvas_dc.SetPen(wx.Pen('red', 1)) # fill colour canvas_dc.SetBrush(wx.Brush('yellow')) for x in range(10, 180, 10): y = x r = x canvas_dc.DrawCircle(x, y, r) # now put the canvas drawing into a bitmap to display it # remember the canvas is on top of the draw_bmp self.statbmp.SetBitmap(draw_bmp) def save_image(self): """save the drawing""" finished_image = self.statbmp.GetBitmap() #finished_image.SaveFile("mydrawing.png", wx.BITMAP_TYPE_PNG) finished_image.SaveFile("mydrawing.jpg", wx.BITMAP_TYPE_JPEG)app = wx.App(0)MyFrame(title='canvas draw and save').Show()app.MainLoop()# help(wx.PaintDC)??
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