Скачать или смотреть Creating a Resizable Rectangle in Tkinter with Checkbuttons and Sliders

Learn how to create an interactive `rectangle` in Tkinter using checkbuttons and sliders to adjust its height and width dynamically!
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This video is based on the question https://stackoverflow.com/q/71423393/ asked by the user 'Baloo' ( https://stackoverflow.com/u/18428699/ ) and on the answer https://stackoverflow.com/a/71427136/ provided by the user 'acw1668' ( https://stackoverflow.com/u/5317403/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Resizable Rectangle in Tkinter with Checkbuttons and Sliders

Tkinter is a powerful GUI toolkit in Python, enabling developers to create interactive desktop applications. One common scenario is creating shapes on a canvas and adjusting their properties dynamically using sliders and buttons. In this guide, we will tackle the question of how to create a rectangle on a canvas, and how to make it resizable using sliders.

Let’s dive into the problem and its solution!

The Problem

In the original attempt to create a rectangle, the rectangle was not accessible outside the function that created it, making it impossible to adjust its dimensions with sliders. The code snippet given was:

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

The rectangle created inside the rect() function could not be reached by the width and height adjustment functions. This led to sliders not functioning as intended.

The Solution: Making the Rectangle Resizable

To solve this problem, we need to modify the code in such a way that the rectangle can be referenced globally. Here’s how we can achieve that:

Step 1: Define a Global Rectangle Variable

First, we will define a global variable to store the rectangle object. This allows us to access the rectangle object in other functions.

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

Step 2: Modify the Rectangle Creation Function

In our rect() function, we will check whether the checkbox is selected, and if so, create the rectangle. If the checkbox is unchecked, we will delete the rectangle. Here’s an updated version of the rect() function:

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

Step 3: Update Width and Height Functions

We will modify the width() and height() functions so that they only execute if the rectangle exists. Here’s how they look after modifications:

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

Step 4: Complete Code

After the modifications, the complete code now looks like this:

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

Conclusion

Now, you can see how easy it is to create a resizable rectangle with a checkbutton and sliders in Tkinter. By using a global variable, we were able to successfully access and modify the rectangle outside of its creation function.

Feel free to experiment with this code by changing the colors or adding more shapes. Happy coding!