Short video demonstrating how to create a customized label with a shader effect in Kivy code.

In this tutorial, we will be creating a Kivy app that uses a Shader Effect to customize the appearance of a Label widget. We will be creating a custom shader effect that will make the label look like it is glowing.

To get started, make sure you have Kivy installed on your system. If you haven’t installed Kivy yet, you can follow the installation instructions on the Kivy website (https://kivy.org/#download).

1. Creating the Kivy app:
   First, create a new Python file for your Kivy app. Let’s call it "shader_label_app.py". In this file, import the necessary modules and classes from Kivy:

from kivy.app import App
from kivy.uix.label import Label
from kivy.core.window import Window
from kivy.graphics import Color, Rectangle
from kivy.lang import Builder

Next, create a custom shader effect class that will be used to modify the appearance of the label. Add the following code to your Python file:

Builder.load_string('''
<CustomLabel>:
    canvas.before:
        Color:
            rgba: 0, .7, 1, 1
        Rectangle:
            size: self.size
            pos: self.pos
''')

class CustomLabel(Label):
    pass

In this code snippet, we are creating a CustomLabel class that inherits from the Label class. Inside this class, we are using Kivy’s builder language to define a shader effect that will give the label a glowing appearance.

1. Adding the custom label to the app:
   Now, let’s create our main app class and add the custom label to it. Update your Python file with the following code:

class ShaderLabelApp(App):
    def build(self):
        return CustomLabel(text='Hello, Kivy!')

In this code snippet, we have created a ShaderLabelApp class that inherits from the App class. In the build method, we are returning an instance of our CustomLabel class with the text ‘Hello, Kivy!’.

1. Running the app:
   To run the app and see the custom shader effect in action, add the following code at the end of your Python file:

if __name__ == '__main__':
    Window.clearcolor = (0, 0, 0, 1)  # Set the background color of the window
    ShaderLabelApp().run()

Now, you can run your Kivy app by executing the Python file. You should see a window with a glowing label that says ‘Hello, Kivy!’. Feel free to customize the shader effect by modifying the Color and Rectangle properties inside the CustomLabel class.

That’s it! You have successfully created a Kivy app that uses a Shader Effect to customize the appearance of a Label widget. I hope you found this tutorial helpful. Happy coding!