#!/usr/bin/python
# -*- coding: UTF-8 -*-

"""
题目:画图,学用rectangle画方形。  
程序分析:
rectangle(int left, int top, int right, int bottom)
参数说明:(left ,top )为矩形的左上坐标,(right,bottom)
为矩形的右下坐标,两者可确定一个矩形的大小
"""

if __name__ == '__main__':
	from Tkinter import *
	root = Tk()
	root.title('Canvas')
	canvas = Canvas(root,width=400,height=400,bg='yellow')
	x0 = 263
	y0 = 263
	y1 = 275
	x1 = 275
	for i in range(10):
		canvas.create_rectangle(x0,y0,x1,y1)
		x0 -= 5
		y0 -= 5
		x1 += 5
		y1 += 5

	canvas.pack()
	root.mainloop()