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How to Do Animation in kivy

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by aryaman@openweaver.com dot icon Updated: Sep 13, 2023

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Kivy is a Python library and programming language. It helps make cross-platform applications, especially ones with graphical user interfaces (GUIs).


Developers make apps for computers, phones, and other devices that people can enjoy. Kivy is a strong tool for making apps with many widgets and animations. Developers can use it to create many different types of applications.  

Kivy has different animation choices:

  • 2D animations: Basic animations that make flat objects move, resize, or rotate.  
  • Complex Transitions: These are animations. It makes widgets move smoothly between different states for an exciting experience.  
  • Kivy3DGUI: Kivy3DGUI, a part of Kivy, lets developers make 3D animations and interactions.  

Kivy has many animation tools for different needs and levels of complexity. These tools include:  

  • Animation Frames: You need to make frames for each frame using widget properties.  
  • Animation Object: You can add transitions to widget properties for a set time.  
  • AnimationTransition: Exploring different transition functions to control the animation's timing and easing.  

To create an animation in Kivy, developers typically follow these steps:  

  • Design the Scene: Plan the visual layout and widget hierarchy required for the spirit.  
  • Define Animation: Use a tool to specify how widgets move, scale, or transform.  
  • Add Final Touches: Make the animation settings perfect. Adjust duration, looping, and transition functions to add final touches.  

Tips for Animating with Kivy:  

  • Use simple animation tools: Create basic animations with the Animation object. 
  • Manage Multiple Animations: Use the Clock's schedule_interval() method to synchronize multiple animations.  
  • Optimize Performance: To make your device faster, use fewer widgets that move. Only update them when necessary.  

To optimize animations for mobile devices, consider the following:  

  • Reduce File Size: Compress images and assets to minimize the app's file size.  
  • Control Frame Rate: You can adjust the frame rate of animations to balance how they look and perform.  
  • Use Hardware Acceleration: Leverage Kivy's hardware acceleration capabilities to enhance animation performance.  

You can share Kivy animations through various means: 

  • Web Galleries: Publish animations on personal websites or web galleries to showcase work.  
  • Social Media: To reach more people, share animations on YouTube, Instagram, and Twitter.  

   

Kivy is a flexible and effective tool for making animations. You can create basic 2D transitions or advanced 3D interactions. Developers can design attractive and interactive applications using animation tools and widgets. Kivy works on many platforms and devices, making it popular for interactive animations. Kivy is a useful tool for energy and GUI programming. You can use it in open-source projects, mobile apps, and online showcases. Its simplicity and versatility make it valuable.  

CODE

Kivy custom animation functions

PythondotLines of Code : 61dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
from kivy.animation import Animation
from kivy.app import App
from kivy.uix.button import Button

class TestApp(App):
    def animate(self, instance):
        animation = Animation(pos=(200, 200), t='in_cubic')
        animation += Animation(pos=(400, 400), t='out_sine')
        animation.start(instance)

    def build(self):
        button = Button(size_hint=(None, None), text='plop',
                        on_press=self.animate)
        return button

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

from kivy.animation import Animation, AnimationTransition
from kivy.app import App
from kivy.uix.button import Button


def in_cubic_out_sine(progress):
    return AnimationTransition.in_cubic(progress) if progress < 0.5 else AnimationTransition.out_sine(progress)

class TestApp(App):
    def animate(self, instance):
        animation = Animation(pos=(200, 200), t=in_cubic_out_sine)
        animation.start(instance)

    def build(self):
        button = Button(size_hint=(None, None), text='plop',
                        on_press=self.animate)
        return button

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

from kivy.animation import Animation
from kivy.app import App
from kivy.uix.button import Button

from math import cos, sin, pi, exp

def custom_animation(progress):
    return 1 - exp(-progress**2)*cos(progress*pi)**3

class TestApp(App):
    def animate(self, instance):
        animation = Animation(pos=(200, 200), t=custom_animation)
        animation.start(instance)

    def build(self):
        button = Button(size_hint=(None, None), text='plop',
                        on_press=self.animate)
        return button

if __name__ == '__main__':
    TestApp().run()
  1. Copy the code using the "Copy" button above, and paste it into a Python file in your IDE.
  2. Modify the code appropriately.
  3. Run the file to check the output.


I hope you found this helpful. I have added the link to dependent libraries and version information in the following sections.

Dependent Libraries

kivyby kivy

Python doticonstar image 15962 doticonVersion:2.2.0doticon
License: Permissive (MIT)

Open source UI framework written in Python, running on Windows, Linux, macOS, Android and iOS

Support
    Quality
      Security
        License
          Reuse

            kivyby kivy

            Python doticon star image 15962 doticonVersion:2.2.0doticon License: Permissive (MIT)

            Open source UI framework written in Python, running on Windows, Linux, macOS, Android and iOS
            Support
              Quality
                Security
                  License
                    Reuse

                      Environment Tested

                      I tested this solution in the following versions. Be mindful of changes when working with other versions.

                      1. The solution is created in Python3.11.
                      2. The solution is tested on kivy 2.2.1 version.

                      FAQ 

                      1. Which programming language uses Kivy to create animations?  

                      The programming language used to create animations with Kivy is Python. Kivy is a Python framework that has tools and widgets for GUI programming. It also has animation capabilities. Python's simplicity and readability make it great for creating interactive animations with Kivy.  

                         

                      2. How do you develop an application that uses Kivy animation?  

                      To develop an application that uses Kivy animation, you need to follow these steps:  

                      a. Install Kivy: Make sure you have Kivy installed in your Python environment.  

                      b. Import Kivy Modules: Import the required modules to use the Kivy library in your Python code.  

                      c. Design the Interface: Create the visual layout of your application using Kivy widgets.  

                      d. Define Animation Logic: You can control how widgets move, change size, and rotate.  

                      e. Bind Animation to Events: Connect animations to button presses or screen transitions.  

                      f. Run the Application: To watch your animations, open the Kivy app with Python.  

                         

                      3. How can I use the Button widget in a Kivy animation?  

                      To make interactive user interfaces in Kivy animations, use the Button widget. It's engaging and fun. When you add animations to the button, it shows visual feedback when the user presses it. You can make the button look different when clicked by using the Animation class. This makes the user experience more interesting.  

                         

                      4. What is the animate method, and how does it work in Kivy?  

                      Kivy's animation method is a convenient way to animate widget properties. This is a feature in the Animation class. You can choose a widget, its properties, values, and how long the animation lasts. Using the animate method makes the widget look graceful as the spirit moves and changes it. It goes from the initial state to the specified target values over a set duration. You can easily make smooth and pretty animations in Kivy using this method.  

                         

                      5. How can I use BoxLayout to create complex animations with Kivy?  

                      To make advanced animations with Kivy, arrange widgets flexibly and dynamically using BoxLayout. BoxLayout arranges child widgets either horizontally or vertically. You can choose how to distribute and align the widgets within the layout. You can make widgets slide, fade, or resize together by using BoxLayout and animations. You can change the BoxLayout's size to show or hide its child widgets. This creates cool and interesting animations in your Kivy app.  

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