Python实例讲解 -- tkinter canvas (设置背景图片及文字)

先来一个绘图：

from Tkinter import *  
  
master = Tk()  
  
w = Canvas(master, width=200, height=100)  
w.pack()  
  
w.create_line(0, 0, 200, 100)  
w.create_line(0, 100, 200, 0, fill="red", dash=(4, 4))  
  
w.create_rectangle(50, 25, 150, 75, fill="blue")  
  
mainloop()

tk 默认处理图片格式为gif 处理其他格式的图片，否则需要下载image的mod，见附件

    # -*- coding:utf-8 -*-  
    # file: TkinterCanvas.py  
    #  
    import Tkinter         # 导入Tkinter模块  
    from PIL import Image, ImageTk  
      
    root = Tkinter.Tk()  
    canvas = Tkinter.Canvas(root,  
        width = 500,      # 指定Canvas组件的宽度  
        height = 600,      # 指定Canvas组件的高度  
        bg = 'white')      # 指定Canvas组件的背景色  
    #im = Tkinter.PhotoImage(file='img.gif')     # 使用PhotoImage打开图片  
    image = Image.open("img.jpg")  
    im = ImageTk.PhotoImage(image)  
      
    canvas.create_image(300,50,image = im)      # 使用create_image将图片添加到Canvas组件中  
    canvas.create_text(302,77,       # 使用create_text方法在坐标（302，77）处绘制文字  
       text = 'Use Canvas'      # 所绘制文字的内容  
       ,fill = 'gray')       # 所绘制文字的颜色为灰色  
    canvas.create_text(300,75,  
       text = 'Use Canvas',  
       fill = 'blue')  
    canvas.pack()         # 将Canvas添加到主窗口  
    root.mainloop()  

参看： http://effbot.org/tkinterbook/canvas.htm#when-to-use

wxpython 的canvas

    # 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  05jan2011  
      
    import wx  
      
    class 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)