Скачать или смотреть Create a Rectangle in the Background Using Python Tkinter

Discover how to easily arrange rectangles in the background in Python Tkinter, ensuring that your design elements appear in the correct order.
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This video is based on the question https://stackoverflow.com/q/66210542/ asked by the user 'Soda' ( https://stackoverflow.com/u/13883245/ ) and on the answer https://stackoverflow.com/a/66210600/ provided by the user 'TheLizzard' ( https://stackoverflow.com/u/11106801/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Rectangle in the Background with Python Tkinter

When working with graphics in Python Tkinter, you might encounter situations where you want a particular rectangle to sit behind others. This is common when creating layered designs in a canvas. But how can you ensure the desired rectangle stays in the background? Let’s dive into solving this problem effectively!

The Problem: Layering Rectangles

In Tkinter, when you create multiple shapes, they are drawn in the order they are created. For example, if you draw three rectangles, the last one drawn will be on top of the previous two. This can make it tricky if you want one of the shapes to be behind the others. Let's look at the rectangles defined in the problem:

[[See Video to Reveal this Text or Code Snippet]]

In this example, rectangle_3_lowest is created last, meaning it will overlap rectangle_1 and rectangle_2, which is not the desired outcome.

The Solution: Using the lower() Method

Fortunately, Tkinter provides a simple way to change the stacking order of shapes on the canvas. By using the canvas.lower() method, you can position a rectangle behind others even after it has been created. Here’s how you can achieve that:

Step-by-Step Implementation

Import Tkinter: Start by importing the Tkinter library.

Create the Main Window: Set up a basic Tkinter window.

Create the Canvas: Add a canvas widget where your rectangles will be drawn.

Draw the Rectangles: Create your rectangles in the desired colours.

Layer the Rectangles: Use the lower() method to position your rectangle behind the others.

Example Code

Here's the complete code you can use:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

Importing Tkinter: import tkinter as tk imports the necessary library for creating GUI apps.

Creating the Window: root = tk.Tk() initializes the main application window.

Creating the Canvas: canvas = tk.Canvas(root) sets up a canvas for drawing shapes.

Adding Rectangles: Each create_rectangle call adds a new rectangle. Notice how rectangle_3_lowest is created last.

Lowering the Rectangle: canvas.lower(rectangle_3_lowest) effectively moves this rectangle to the back of the stacking order, ensuring it doesn't obstruct the view of rectangle_1 and rectangle_2.

Conclusion

Now you know how to effectively arrange your rectangles in Tkinter so that one can sit behind the others, regardless of the order in which they were created. The use of the lower() method is a powerful feature of the Tkinter canvas that enhances your ability to manage graphical elements and create engaging user interfaces.

If you have any further questions or need examples on specific UI components in Tkinter, feel free to reach out. Happy coding!