如何使用类在 tkinter 画布上绘制多边形? [英] How to draw a polygon on a tkinter canvas using a class?

问题描述

from tkinter import*

root = Tk()
shape = Canvas(root)

class GUI():
    def __init__(self):
        pass

    def create_polygon(self, points, colour, posit):
        try:
            shape.delete(self.poly)
        except:
            pass
        self.poly = shape.create_polygon(points, colour, posit)
        self.poly.shape.grid(column=posit[0],row=posit[1])

polygon = GUI()
polygon.create_polygon([150,75,225,0,300,75,225,150],'yellow',[1,2])

我是使用 tkinter 和类的新手，但我想创建一个非常简单的类来创建正多边形.这个程序中的代码应该删除以前创建的任何多边形，然后在调用程序时继续创建一个新的多边形，但我不断收到一个我不明白的错误.另外你会如何去画一个六边形?

I'm new to using tkinter and classes but I want to make a very simple class to create a regular polygon. The code in this program should delete any polygon previously made and then proceed to make a new polygon when the program is called but I keep getting an error that I don't understand. Also how would you go about drawing a hexagon instead?

Traceback (most recent call last):
  File "//xsvr-02/Students/10SAMP_Al/HW/polygon creator.py", line 19, in <module>
polygon.create_polygon([150,75,225,0,300,75,225,150],'yellow',[1,2])
 File "//xsvr-02/Students/10SAMP_Al/HW/polygon creator.py", line 15, in create_polygon
self.poly = shape.create_polygon(points, colour, posit)
 File "C:\Python34\lib\tkinter\__init__.py", line 2305, in create_polygon
return self._create('polygon', args, kw)
File "C:\Python34\lib\tkinter\__init__.py", line 2287, in _create
*(args + self._options(cnf, kw))))
_tkinter.TclError: wrong # coordinates: expected an even number, got 11

推荐答案

只是调用参数错误.

如果您想更改代码，此解决方案可以为您提供帮助.

If you want to change your code, this solution can help you.

类 GUI 只是继承自 Canvas，并没有实现任何东西.

Class GUI just inherits from Canvas and doesn't implement anything.

from Tkinter import*

root = Tk()

class GUI(Canvas):
    '''inherits Canvas class (all Canvas methodes, attributes will be accessible)
       You can add your customized methods here.
    '''
    def __init__(self,master,*args,**kwargs):
        Canvas.__init__(self, master=master, *args, **kwargs)

polygon = GUI(root)
polygon.create_polygon([150,75,225,0,300,75,225,150],     outline='gray', 
            fill='gray', width=2)

polygon.pack()
root.mainloop()

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