Animation in Kivy

Implementation in Kivy

Follow these steps to use Animation:

• Create an object for animation.
• On a Widget, use the Animation object.

To use animation, we must first import the Animation from kivy.animation module.

Syntax:

from kivy.animation import Animation

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Run Code

Let's look at an example to grasp its implementation better.

Code 1

Here's a basic demonstration of using the Animation in a Kivy application. After writing the code in an editor, save the file using the .py extension.

Filename: animations.py

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.lang import Builder
from kivy.animation import Animation

# Designate Our .kv design file 
Builder.load_file('animations.kv')

class MyLayout(Widget):
def animate_it(self, widget, *args):
# Defining the Animation 
anim = Animation(
background_color=(0,0,1,1),
duration=1)

#Second animation
anim += Animation(
size_hint = (1,1))

#Third animation
anim += Animation(
size_hint = (.5,.5))

anim += Animation(
pos_hint = {"center_x": 0.1})

anim += Animation(
pos_hint = {"center_x": 0.5})

# Starting The Animation
anim.start(widget)

# Create a callback
anim.bind(on_complete = self.my_callback)

def my_callback(self, *args):
self.ids.my_label.text = "Amazing!! Look At that!"

class AnimationApp(App):
def build(self):
return MyLayout()

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

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Run Code

Writing everything in the same code leads to a jumbled mess that is difficult to understand by others. Hence we are using another file animations.kv, which enables us to build our widget tree in a declarative manner and helps to call back widget properties properly.

Filename: animations.kv

Code 2

<MyLayout>
BoxLayout:
orientation: "vertical"
size: root.width, root.height

padding: 30
spacing: 20

Label:
id: my_label
text: "Welcome Ninja!"
font_size: 30

Button:
text: "Press Me to see Magic!"
font_size: 30
size_hint: .5, .5
pos_hint: {"center_x": 0.5}

on_release: root.animate_it(self)

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Run Code

Steps to run code

To run our program, consider the following steps:

Step 1: Open the Anaconda Prompt and enter the correct path to our kivy programme.

Step 2: Use the following command and press Enter to run the programme.

Python file_name.py (Example: animations.py)

Output

Frequently Asked Questions

What is Callback in kivy?

We must bind callbacks to events to use them. Our callbacks will be called with the parameters relevant to that specific event when the event is dispatched. Any python callable can be used as a callback, but it must accept the arguments that the event sends. 

What exactly is KivyMD?

KivyMD is a set of Material Design widgets for use with Kivy, a mobile app development platform. It's comparable to the Kivy framework, but with a more appealing user interface.

Is Kivy Native?

Kivy is compatible with Linux, Windows, OS X, Android, iOS, and the Raspberry Pi. The same code will execute on all supported systems. Most inputs, protocols, and devices are supported natively, including WM Touch, WM Pen, Mac OS X Trackpad and Magic Mouse, Mtdev, Linux Kernel HID, and TUIO.

Is Kivy a frontend or backend application?

Kivy is a Python-based library that may be used to create the app's frontend. Kivy can be used as a frontend library, and Python can be used for the backend.

Conclusion

This article extensively discussed Animationin Kivy, its Implementation, and the steps to run the code using the Anaconda command prompt. Check out the article on the 19 best Python frameworks to know more about different Python frameworks.

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