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Kivy Cookbook

Kivy Cookbook

By : Hugo Solis, Solis
2.5 (2)
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Kivy Cookbook

Kivy Cookbook

2.5 (2)
By: Hugo Solis, Solis

Overview of this book

Kivy is an open-source Python library for rapid development of applications that make use of innovative user interfaces, such as multi-touch apps. It is a promising Python framework to develop UI and UX apps in a cross-platform environment, under the Python philosophy. Kivy Cookbook is a practical book that will guide you through the Kivy framework to develop apps and get your apps ready for distribution in App Store and Android devices. You will start off with installing Kivy and building your interfaces. You will learn how to work the accelerometer and create custom events. Then, you will understand how to use the basics, buttons, labels and text inputs and manipulate the widget tree. Next, you will be able to work with manipulating instructions, create an atlas and layouts. Moving on, you will learn packing for Windows and packing for iOS, and use TestDrive. By the end of the book, you will have learnt in detail the relevant features and tools in Kivy and how to create portable packages to distribute your apps in the most used platforms.
Table of Contents (11 chapters)
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10
Index

Working with manipulating instructions


Sometimes, we want to change or update the look of the canvas. This kind of instruction is what we call a manipulating instruction. This recipe will demonstrate the use of these instructions with the help of an ellipse, which could change its size with the change of the screen size without a layout.

Getting ready

We are going to work with a predefined geometric shape in this recipe. You could find a clearer panorama if you had read the second recipe in this chapter. Also, we will trigger an event in the recipe, so you should be clear about Chapter 3, Events, and specifically the recipe Creating custom events.

How to do it…

We will just need a Python file to complete the task in the class of the root widget, and we will use the manipulating instructions by following these steps:

  1. Import the usual Kivy package.

  2. Import the ellipse.

  3. Define the class for the root widget.

  4. Draw the ellipse in the center of the app.

  5. Bind the pos and size with the method update_rect(...

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