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)