Create Python Games and Mobile Apps with Kivy Course

Kivy is an open-source Python framework for developing multi-touch applications. It is highly recommended for beginners who are interested in creating games and mobile apps with Python.

In this tutorial, we will cover the basics of Kivy and guide you through creating your first game or mobile app using this framework.

1. Setting Up Kivy:
   First, you need to install Kivy on your system. You can do this by running the following command in your terminal:

pip install kivy

After installing Kivy, you can start creating your game or mobile app.

1. Creating a Basic App:
   Let’s start by creating a basic app using Kivy. Create a new Python file and import the necessary modules:

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.label import Label

Next, create a class for your app by subclassing the App class:

class MyApp(App):
    def build(self):
        return Label(text='Hello, World!')

Finally, run your app using the run method:

if __name__ == '__main__':
    MyApp().run()

When you run your app, you should see a window with the text "Hello, World!" displayed.

1. Adding Widgets:
   Kivy provides a wide range of built-in widgets that you can use to create interactive user interfaces. Let’s add a button to our app:

class MyApp(App):
    def build(self):
        button = Button(text='Click Me!')
        button.bind(on_press=self.on_button_click)

        return button

    def on_button_click(self, instance):
        print('Button Clicked!')

In this code snippet, we created a Button widget and bound a function to its on_press event. When the button is clicked, the on_button_click function will be called and the message "Button Clicked!" will be printed to the console.

1. Creating a Game:
   Now that you have learned the basics of Kivy, let’s create a simple game using this framework. We will create a game where the player has to click on moving targets.

Create a new Python file and import the necessary modules:

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.button import Button
from kivy.clock import Clock
from random import randint

Next, create a class for your game by subclassing the App class:

class TargetGame(App):
    def build(self):
        self.targets = []

        self.target_widget = Widget()
        self.add_target()

        Clock.schedule_interval(self.update, 1.0 / 60.0)
        return self.target_widget

In this code snippet, we created a class called TargetGame and defined a build method to create the game window. We also created a Widget called target_widget to hold the moving targets.

Next, let’s implement the add_target method to add a new target to the game:

def add_target(self):
    target = Button(text='Target')
    target.pos = (randint(0, self.target_widget.width), randint(0, self.target_widget.height))

    target.bind(on_press=self.on_target_click)

    self.targets.append(target)
    self.target_widget.add_widget(target)

In this code snippet, we created a new Button widget and randomly assigned its position within the game window. We also bound a function to the on_press event of the target button.

Finally, let’s implement the update and on_target_click methods to update the targets’ positions and handle target clicks, respectively:

def update(self, dt):
    for target in self.targets:
        target.pos = (target.x + randint(-10, 10), target.y + randint(-10, 10))

def on_target_click(self, instance):
    self.target_widget.remove_widget(instance)
    self.targets.remove(instance)
    self.add_target()

In the update method, we iterate over all targets and update their positions by adding a random value to their current position. In the on_target_click method, we remove the clicked target from the game and add a new target.

1. Conclusion:
   In this tutorial, we covered the basics of Kivy and demonstrated how to create a simple game using this framework. Kivy provides a powerful set of tools for developing interactive applications and games with Python.

I hope this tutorial has inspired you to explore Kivy further and develop your own games and mobile apps. Happy coding!