Tkinter画布创建矩形 [英] Tkinter Canvas creating rectangle

问题描述

在python中，我尝试创建一个涉及在画布上创建形状的游戏。例如，我希望在我的画布图像上出现一个红色矩形。当我执行代码时，您看到的矩形的大小约为1像素，但我不确定为什么以及这样的矩形。这是我的代码：

In python, tkinter, I'm trying to make a game that involves creating shapes onto a canvas. For example, I want a red rectangle to appear over my canvas image. When I execute my code, the rectangle you see is about 1 pixel in size, and I'm not sure why and how it got like that. Here's my code:

from tkinter import *
root = Tk()
root.geometry("500x900")
canvas = Canvas(root, width=550, height=820)
canvas.pack()
png = PhotoImage(file = r'example.png') # Just an example
canvas.create_image(0, 0, image = png, anchor = "nw")

a = canvas.create_rectangle(50, 0, 50, 0, fill='red')
canvas.move(a, 20, 20)

希望这可以解决。 / p>

Hope this can be resolved.

推荐答案

create_rectangle 方法采用4个坐标：
canvas.create_rectangle（x1，y1，x2，y2，** kwargs），其中（x1，y1）的坐标为左上角，（x2，y2）的坐标为右下角。但是您给了两次相同的坐标，因此矩形的宽度和高度为零，这就是为什么只能看到一个像素的原因。尝试使用 canvas.create_rectangle（50，0，100，50，fill ='red'），这一次您应该获得侧面50像素的正方形。

The create_rectangle method takes 4 coordinates: canvas.create_rectangle(x1, y1, x2, y2, **kwargs), with (x1,y1) the coordinates of the top left corner and (x2, y2) those of the bottom right corner. But you gave twice the same coordinates so your rectangle has a zero width and height, that's why you can only see a pixel. Try with canvas.create_rectangle(50, 0, 100, 50, fill='red') and this time you should get a square of side 50 pixels.

您可以在此create_rectangle 参数的更多信息。 /web/20181223164027/http://infohost.nmt.edu/tcc/help/pubs/tkinter/web/create_rectangle.html rel = noreferrer>网站。

You can get more details about the arguments of create_rectangle on this website.

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