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

sm702

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)