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Kivy - Interactive Applications and Games in Python

By : Roberto Ulloa

3.7 (10)

Kivy - Interactive Applications and Games in Python

3.7 (10)

By: Roberto Ulloa

Overview of this book

If you are a Python developer who wants to create exciting and dynamic UI/UX applications that are compatible with multiple platforms, then this is the book for you. No prior experience with Kivy is required, although you should be familiar with Python and have a fair understanding of software engineering concepts such as inheritance, classes, and instances.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. GUI Basics – Building an Interface

1. GUI Basics – Building an Interface

Basic interface – Hello World!

Basic widgets – labels and buttons

Layouts

Embedding layouts

PageLayout – swiping pages

Our project – Comic Creator

Summary

2. Graphics – the Canvas

2. Graphics – the Canvas

Understanding the canvas

Drawing basic shapes

Adding images, colors, and backgrounds

Structuring graphic instructions

Rotating, translating, and scaling the coordinate space

Comic Creator: PushMatrix and PopMatrix

Summary

3. Widget Events – Binding Actions

3. Widget Events – Binding Actions

Attributes, ID, and root

Basic widget events – dragging the stickman

Localizing coordinates – adding stickmen

Binding and unbinding events – sizing limbs and heads

Binding events in the Kivy language

Creating your own events – the magical properties

Kivy and its properties

Summary

4. Improving the User Experience

4. Improving the User Experience

ScreenManager – selecting colors for the figures

Color control on the canvas – coloring figures

StencilView – limiting the drawing space

Scatter – multi-touching to drag, rotate, and scale

Recording gestures – line, circle, and cross

Recognizing gestures – drawing with the finger

Behaviors – enhancing widget's functionality

Style – decorating the interface

Factory – replacing a vertex instruction

Summary

5. Invaders Revenge – an Interactive Multi-touch Game

5. Invaders Revenge – an Interactive Multi-touch Game

Invaders Revenge – an animated multi-touch game

Atlas – An efficient management of images

Boom – simple sound effects

Ammo – simple animation

Invader – transitions for animations

Dock – automatic binding in the Kivy language

Fleet – infinite concatenation of animations

Scheduling events with the clock

Shooter – multi-touch control

Invasion – moving the shooter with the keyboard

Combining animations with '+' and '&'

Summary

6. Kivy Player – a TED Video Streamer

6. Kivy Player – a TED Video Streamer

Video – play, pause, and stop

AsyncImage – creating a cover for the video

Subtitles – tracking the video progression

Control bar – adding buttons to control the video

Slider – including a progression bar

Animation – hiding a widget

Kivy inspector – debugging interfaces

ActionBar – a responsive bar

LoadDialog – displaying a directory of files

ScrollView – displaying a list of videos

Search – query the TED Developer API

Summary

Index

Index

Drawing basic shapes

Before starting, let's introduce the Python code that we will reuse in all the examples of this chapter:

1. # File name: drawing.py
2. from kivy.app import App
3. from kivy.uix.relativelayout import RelativeLayout
4. 
5. class DrawingSpace(RelativeLayout):
6.     pass
7. 
8. class DrawingApp(App):
9.     def build(self):
10.         return DrawingSpace()
11. 
12. if __name__=="__main__":
13.     DrawingApp().run()

We created the subclass DrawingSpace from RelativeLayout. It could have been inherited from any Widget but using RelativeLayout is generally a good choice for graphics because we usually want to draw inside the widget, and that means relative to its position.

Let's start with the canvas. There are basically two types of instructions that we can add to a canvas: vertex instructions and context instructions.

Note

The vertex instructions inherit from the VertexInstruction base class, and allow us to draw vector shapes in the coordinate space.

The...

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