帮助使用Tkinter创建Python类 [英] Help Creating Python Class with Tkinter

问题描述

如何创建一个名为矩形的类，我可以将坐标和颜色传递给它，并填充这些颜色？

How do I create a class called rectangle that I can pass it the coordinates and a color and have it fill those one?

from Tkinter import *
master = Tk()

w = Canvas(master, width=300, height=300)
w.pack()

class rectangle():

    def make(self, ulx, uly, lrx, lry, color):
        self.create_rectangle(ulx, uly, lrx, lry, fill=color)


rect1 = rectangle()
rect1.make(0,0,100,100,'blue')

mainloop()

推荐答案

这里有一种方法。首先，要在Tk Canvas上绘制矩形，您需要调用Canvas的 create_rectangle 方法。我还使用 __ init __ 方法来存储矩形的属性，这样您只需要将Canvas对象作为参数传递给矩形的 draw ）方法。

Here is one way of doing it. First, to draw the rectangle on the Tk Canvas you need to call the create_rectangle method of the Canvas. I also use the __init__ method to store the attributes of the rectangle so that you only need to pass the Canvas object as a parameter to the rectangle's draw() method.

from Tkinter import *

class Rectangle():
    def __init__(self, coords, color):
        self.coords = coords
        self.color = color

    def draw(self, canvas):
        """Draw the rectangle on a Tk Canvas."""
        canvas.create_rectangle(*self.coords, fill=self.color)

master = Tk()
w = Canvas(master, width=300, height=300)
w.pack()

rect1 = Rectangle((0, 0, 100, 100), 'blue')
rect1.draw(w)

mainloop()

EDIT

回答您的问题： * c $ c> self.coords ？

Answering your question: what is the * in front of self.coords?

要在Tk Canvas上创建一个矩形，可以调用 create_rectangle 方法如下。

To create a rectangle on a Tk Canvas you call the create_rectangle method as follows.

Canvas.create_rectangle(x0, y0, x1, y1, option, ...)

因此每个协调器（ x0 ， y0 等）是方法的个别参数。但是，我已经将Rectangle类的coords存储在一个单独的4元组中。我可以将这个单一的元组传递给方法调用，并在它前面放置一个 * 将它解包到四个单独的坐标值。

So each of the coords (x0, y0, etc) are indiviual paramaters to the method. However, I have stored the coords of the Rectangle class in a single 4-tuple. I can pass this single tuple into the method call and putting a * in front of it will unpack it into four separate coordinate values.

如果我有 self.coords =（0,0,1,1），则 create_rectangle（* self.coords）将以 create_rectangle（0，0，1，1）结束，而不是 create_rectangle（（0，0，1， 1））。请注意第二个版本中的内部括号。

If I have self.coords = (0, 0, 1, 1), then create_rectangle(*self.coords) will end up as create_rectangle(0, 0, 1, 1), not create_rectangle((0, 0, 1, 1)). Note the inner set of parentheses in the second version.

Python文档在 unpacking argument lists 。

The Python documentation discusses this in unpacking argument lists.

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