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Home > Mobile > Cross Platform Mobile Development > Kivy Cookbook
Kivy Cookbook
Kivy Cookbook

Kivy Cookbook: Enhance your skills in developing multi-touch applications with Kivy

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Kivy Cookbook

Chapter 2. Input, Motion, and Touch

In this chapter, we will cover:

  • Using the mouse
  • Evolving to the touchscreen
  • Working with the accelerometer
  • Using the gyroscope
  • The Differences between the touch and motion events
  • Recognizing touch shapes
  • Detecting multitapping
  • Grabbing touch events
  • Recording gestures

Introduction

The Kivy framework is able to handle most common types of input and actions such as mouse, touchscreen, accelerometer, and gyroscope that will be reviewed in this chapter. It handles the native multitouch protocols on the following platforms: Tuio, WM_Touch, MacMultitouchSupport, MT Protocol A/B, and Android.

The class of all input events is motion event. It generates two kinds of events; one of them is touch events—a motion event that contains at least an x and y position. All the touch events are dispatched across the widget tree. The no-touch events are the rest. The accelerometer is a continuous event, without position. It never starts or stops. These events are not dispatched across the widget tree.

Using the mouse

This recipe will teach you how to use the first kind of input, probably the most used, the mouse. We will consider the mouse input as a touch event, so the (x, y) position of the touch (0-1 range) will be scaled to the window size (width/height) and dispatched to the following:

  • on_touch_down: An event is fired when a touch down event is initiated. Subsequently, the respective widget's on_touch_down() method is called.
  • on_touch_move: An event is fired when a touch event moves (changes location). Subsequently, the respective widget's on_touch_move() method is called.
  • on_touch_up: An event is fired when a down event is released (terminated). Subsequently, the respective widget's on_touch_up() method is called.

Getting ready

In this recipe, we will use the Kv language for the design of the widgets, so you will need to be familiar with the language or have completed the previous chapter. Also, this recipe will use the common Button widget for reference.

How to do it...

Evolving to the touchscreen

In this recipe, we are evolving to the touchscreen. Here, you will see the basic differences between the mouse and the touchscreen. This will give us more options than with the mouse device.

Getting ready

For this recipe, we will use the Kv language for the design of the widgets, so make sure that you are confident with it and refresh your knowledge if necessary. Also, this recipe will use the common button and label widgets for reference. Obviously, to get more benefit, a touchscreen device is useful to run the code.

How to do it…

Perform the following steps:

  1. In the KV file, declare the button and the label:
    <MyW>:
    Button:
        id: button1
        text: 'Hello'
    Label:
        id: label1
        pos: 100, 100
        text: 'My label before press the screen'
  2. In the class of the widget in the Python code, we need to override the method on_touch_down
  3. Change the button text with the information in touch.button
  4. Change the label text...

Working with the accelerometer

Nowadays, it is common that mobile devices are equipped with an accelerometer. Thereby, it is relevant to consider this input to develop fancy apps. The accelerometer is one kind of event that is considered as a no-touch event because it has neither start nor an end, it is always providing information.

Getting ready

In this recipe, we will use the Kv language for the design of the widgets, so, again, you will need to be familiar with the Kv language. Also, this recipe will use the common button and label widgets for reference. Obviously, to get more benefit, a device with an accelerometer is useful to run the code.

It is necessary to install a package for the use of the accelerometer in any mobile device; there is a way to deal with every specific device, but we do not have to reinvent the wheel. Let's use a Plyer package, which is an effort from many of the Kivy developers. To install the package from the shell, use:

$ sudo pip plyer install

Here where we...

Using the gyroscope

Mobile devices today also have a gyroscope. The gyroscope is considered as a no-touch event. This kind of event does not have a start or an end; it is always providing information.

Getting ready

For this recipe, we will use the Kv language for the design of the widgets. Also, this recipe will use the common button and label widgets for reference. Obviously, to run the code of this recipe properly, a device with a gyroscope is necessary.

It is necessary to install a package to use the gyroscope with any mobile device. While there is a way to deal with specific devices, we do not have to reinvent the wheel. Let's use the plyer package, which is an effort from many of the Kivy developers. To install the package from the shell, use:

$ sudo pip plyer install

How to do it…

To complete this recipe, follow these steps:

  1. In the KV file, define the four labels and the button:
    <Acce>:
    Label:
        id: label1
        pos: 150, 300
        text: 'X: '

...

The differences between the touch and motion events

There is a key difference between touch and motion events. A motion event is a continuous succession of many touch events. However, we also know that a touch event always has the pos profile, namely position information. The motion event, however, is not dispatched throughout the widget tree.

Getting ready

In this recipe, we will use the Kv language for the design of the widgets, so we assume that the reader is familiar with the Kv language or did the lecture of the first chapter. Also, this recipe will use the common button widget for reference.

How to do it…

Use this recipe and follow these steps:

  1. First, in the KV file, define a button:
    <MyW>:
    Button:
        id: button1
        pos: 0,0
        text: 'Hello'
  2. In the class of the widget in the Python code, we need to override the method on_touch_move.
  3. Change the button's position with the information in touch.pos:
    import kivy
kivy.require('1.9.0') 

from...

Introduction

The Kivy framework is able to handle most common types of input and actions such as mouse, touchscreen, accelerometer, and gyroscope that will be reviewed in this chapter. It handles the native multitouch protocols on the following platforms: Tuio, WM_Touch, MacMultitouchSupport, MT Protocol A/B, and Android.

The class of all input events is motion event. It generates two kinds of events; one of them is touch events—a motion event that contains at least an x and y position. All the touch events are dispatched across the widget tree. The no-touch events are the rest. The accelerometer is a continuous event, without position. It never starts or stops. These events are not dispatched across the widget tree.

Using the mouse

This recipe will teach you how to use the first kind of input, probably the most used, the mouse. We will consider the mouse input as a touch event, so the (x, y) position of the touch (0-1 range) will be scaled to the window size (width/height) and dispatched to the following:

  • on_touch_down: An event is fired when a touch down event is initiated. Subsequently, the respective widget's on_touch_down() method is called.

  • on_touch_move: An event is fired when a touch event moves (changes location). Subsequently, the respective widget's on_touch_move() method is called.

  • on_touch_up: An event is fired when a down event is released (terminated). Subsequently, the respective widget's on_touch_up() method is called.

Getting ready

In this recipe, we will use the Kv language for the design of the widgets, so you will need to be familiar with the language or have completed the previous chapter. Also, this recipe will use the common Button widget for reference.

How to do it…

Follow the steps...

Evolving to the touchscreen

In this recipe, we are evolving to the touchscreen. Here, you will see the basic differences between the mouse and the touchscreen. This will give us more options than with the mouse device.

Getting ready

For this recipe, we will use the Kv language for the design of the widgets, so make sure that you are confident with it and refresh your knowledge if necessary. Also, this recipe will use the common button and label widgets for reference. Obviously, to get more benefit, a touchscreen device is useful to run the code.

How to do it…

Perform the following steps:

  1. In the KV file, declare the button and the label:

    <MyW>:
    Button:
        id: button1
        text: 'Hello'
    Label:
        id: label1
        pos: 100, 100
        text: 'My label before press the screen'

  2. In the class of the widget in the Python code, we need to override the method on_touch_down

  3. Change the button text with the information in touch.button

  4. Change the label text with the information in...

Working with the accelerometer

Nowadays, it is common that mobile devices are equipped with an accelerometer. Thereby, it is relevant to consider this input to develop fancy apps. The accelerometer is one kind of event that is considered as a no-touch event because it has neither start nor an end, it is always providing information.

Getting ready

In this recipe, we will use the Kv language for the design of the widgets, so, again, you will need to be familiar with the Kv language. Also, this recipe will use the common button and label widgets for reference. Obviously, to get more benefit, a device with an accelerometer is useful to run the code.

It is necessary to install a package for the use of the accelerometer in any mobile device; there is a way to deal with every specific device, but we do not have to reinvent the wheel. Let's use a Plyer package, which is an effort from many of the Kivy developers. To install the package from the shell, use:

$ sudo pip plyer install

Here where we are...

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Page 1 of 11

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Description

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.

What you will learn

  • Access widgets defined inside Kv language in your Python code Handle Kivy events to control widgets, touches, the mouse, the keyboard, and animations Recognize touch shapes and detecting multi-tapping Create custom events and declare properties Organizing your layouts while working with the ActionBar Store and retrieve the coordinate space context Create your own shader and render in a framebuffer Leverage Factory objects, multi-touch in iOS and multi-touch in Android

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Aug 21, 2015
Length: 246 pages
Edition : 1st
Language : English
ISBN-13 : 9781783987399
Category :
Mobile
Languages :
Python
Concepts :
Cross Platform Mobile Development
Tools :
Kivy

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Product Details

Publication date : Aug 21, 2015
Length: 246 pages
Edition : 1st
Language : English
ISBN-13 : 9781783987399
Category :
Mobile
Languages :
Python
Concepts :
Cross Platform Mobile Development
Tools :
Kivy

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Table of Contents

10 Chapters
1. Kivy and the Kv Language Chevron down icon Chevron up icon
1. Kivy and the Kv Language
Introduction
Installing Kivy
Building your interfaces
Declaring properties within a class
Relating Python code and the Kv language
Referencing widgets
Accessing widgets defined inside the Kv language in your Python code
Reusing styles in multiple widgets
Designing with the Kv language
Running your code
Using Kivy garden
2. Input, Motion, and Touch Chevron down icon Chevron up icon
2. Input, Motion, and Touch
Introduction
Using the mouse
Evolving to the touchscreen
Working with the accelerometer
Using the gyroscope
The differences between the touch and motion events
Recognizing touch shapes
Detecting multitapping
Grabbing touch events
Recording gestures
3. Events Chevron down icon Chevron up icon
3. Events
Introduction
Scheduling a one-time event
Scheduling a repetitive event
Triggering events
Defining widget events
Creating custom events
Attaching callbacks
Declaring a property
Compounding properties
4. Widgets Chevron down icon Chevron up icon
4. Widgets
Introduction
Using the basics: buttons, labels, and text inputs
Manipulating the widget tree
Traversing the tree
Using swappable widgets
Organizing with layouts
Using FloatLayout
Using BoxLayout
Using GridLayout
Using StackLayout
Using RelativeLayout
Using AnchorLayout
Working with ActionBar
5. Graphics – Canvas and Instructions Chevron down icon Chevron up icon
5. Graphics – Canvas and Instructions
Introduction
Separating with the screen manager
Using drawing instructions
Using context instructions
Working with manipulating instructions
Rotating, translating, and scaling the canvas
Modifying with multitouching
Storing and retrieving the coordinate space context
Introducing animations
6. Advanced Graphics – Shaders and Rendering Chevron down icon Chevron up icon
6. Advanced Graphics – Shaders and Rendering
Introduction
Using Carousel
Creating and using Atlas
Creating layouts
Editing shaders
Creating widgets
Creating your own shader
Rendering in a Framebuffer
Optimizing graphics
7. The API in Detail Chevron down icon Chevron up icon
7. The API in Detail
Introduction
Getting to know the API
Using the asynchronous data loader
Logging objects
Parsing
Applying utils
Leveraging the factory object
Working with audio
Working with video
Working with a camera
Using spelling
Adding effects
Advanced text manipulation
8. Packaging our Apps for PC Chevron down icon Chevron up icon
8. Packaging our Apps for PC
Introduction
Packaging for Windows
Including multimedia for Windows
Running apps in Windows
Packaging for Mac OS
Including multimedia for Mac OS
Running apps in Mac OS
Packaging for Linux
Including multimedia for Linux
Running apps in Linux
9. Kivy for Mobile Devices Chevron down icon Chevron up icon
9. Kivy for Mobile Devices
Introduction
Packaging for iOS
Resizing the screen into iOS
Leveraging mobile features in iOS
Preparing for the App Store
Packaging for Android
Resizing the screen into Android
Leveraging mobile features in Android
Index Chevron down icon Chevron up icon
Index

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Customer reviews

Rating distribution
Full star icon Full star icon Half star icon Empty star icon Empty star icon 2.5
(2 Ratings)
5 star 0%
4 star 50%
3 star 0%
2 star 0%
1 star 50%
SL Sep 10, 2015
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
This book covers Kivy for Python programmation language. Kivy helps you build graphical interfaces that run on all PC platforms and also on android and IOS. http://kivy.org/The cookbook format is quite convenient because it gives several recipes from extremely basic to more advanced ones. From launching a "hello world" app to packaging your app for distribution.So it's a good purchase and it was worth reading it.
Amazon Verified review Amazon
jooster Sep 07, 2017
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
I cannot recommend this book. Though the format fits my work/learning style, the example code is riddled with errors, problems and omissions. Right of the bat, the very first example (hello world) does not work as described. The remainder of the book is an exercise in frustration. I (tried to) made it through several examples before moving onto something else.
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About the authors

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Profile icon Hugo Solis
Hugo Solis
Hugo Solis is an assistant professor in the physics department at the University of Costa Rica. In the same institution, he collaborates with CITIC and CICIMA. His current research interests include computational cosmology, complexity, and the infl uence of hydrogen on material properties. He has wide experience in languages, including C/C++ and Python for scientifi c programming and visualization. He is a member of the Free Software Foundation and has contributed code to some free software projects. He has also been a technical reviewer for Mastering Object-oriented Python, Kivy: Interactive Applications in Python, and Learning Object-Oriented Programming by Packt Publishing. Currently, he is in charge of the IFT, a Costa Rican scientifi c nonprofi t organization for the multidisciplinary practice of physics (http://iftucr.org).
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Profile icon Solis
Solis
Hugo Solis is an assistant professor in the physics department at the University of Costa Rica. In the same institution, he collaborates with CITIC and CICIMA. His current research interests include computational cosmology, complexity, and the infl uence of hydrogen on material properties. He has wide experience in languages, including C/C++ and Python for scientifi c programming and visualization. He is a member of the Free Software Foundation and has contributed code to some free software projects. He has also been a technical reviewer for Mastering Object-oriented Python, Kivy: Interactive Applications in Python, and Learning Object-Oriented Programming by Packt Publishing. Currently, he is in charge of the IFT, a Costa Rican scientifi c nonprofi t organization for the multidisciplinary practice of physics (http://iftucr.org).
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Where there is an eBook version of a title available, you can buy it from the book details for that title. Add either the standalone eBook or the eBook and print book bundle to your shopping cart. Your eBook will show in your cart as a product on its own. After completing checkout and payment in the normal way, you will receive your receipt on the screen containing a link to a personalised PDF download file. This link will remain active for 30 days. You can download backup copies of the file by logging in to your account at any time.

If you already have Adobe reader installed, then clicking on the link will download and open the PDF file directly. If you don't, then save the PDF file on your machine and download the Reader to view it.

Please Note: Packt eBooks are non-returnable and non-refundable.

Packt eBook and Licensing When you buy an eBook from Packt Publishing, completing your purchase means you accept the terms of our licence agreement. Please read the full text of the agreement. In it we have tried to balance the need for the ebook to be usable for you the reader with our needs to protect the rights of us as Publishers and of our authors. In summary, the agreement says:

  • You may make copies of your eBook for your own use onto any machine
  • You may not pass copies of the eBook on to anyone else
How can I make a purchase on your website? Chevron down icon Chevron up icon

If you want to purchase a video course, eBook or Bundle (Print+eBook) please follow below steps:

  1. Register on our website using your email address and the password.
  2. Search for the title by name or ISBN using the search option.
  3. Select the title you want to purchase.
  4. Choose the format you wish to purchase the title in; if you order the Print Book, you get a free eBook copy of the same title. 
  5. Proceed with the checkout process (payment to be made using Credit Card, Debit Cart, or PayPal)
Where can I access support around an eBook? Chevron down icon Chevron up icon
  • If you experience a problem with using or installing Adobe Reader, the contact Adobe directly.
  • To view the errata for the book, see www.packtpub.com/support and view the pages for the title you have.
  • To view your account details or to download a new copy of the book go to www.packtpub.com/account
  • To contact us directly if a problem is not resolved, use www.packtpub.com/contact-us
What eBook formats do Packt support? Chevron down icon Chevron up icon

Our eBooks are currently available in a variety of formats such as PDF and ePubs. In the future, this may well change with trends and development in technology, but please note that our PDFs are not Adobe eBook Reader format, which has greater restrictions on security.

You will need to use Adobe Reader v9 or later in order to read Packt's PDF eBooks.

What are the benefits of eBooks? Chevron down icon Chevron up icon
  • You can get the information you need immediately
  • You can easily take them with you on a laptop
  • You can download them an unlimited number of times
  • You can print them out
  • They are copy-paste enabled
  • They are searchable
  • There is no password protection
  • They are lower price than print
  • They save resources and space
What is an eBook? Chevron down icon Chevron up icon

Packt eBooks are a complete electronic version of the print edition, available in PDF and ePub formats. Every piece of content down to the page numbering is the same. Because we save the costs of printing and shipping the book to you, we are able to offer eBooks at a lower cost than print editions.

When you have purchased an eBook, simply login to your account and click on the link in Your Download Area. We recommend you saving the file to your hard drive before opening it.

For optimal viewing of our eBooks, we recommend you download and install the free Adobe Reader version 9.