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)