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Home > Programming > GUI Application Development > OpenFrameworks Essentials
OpenFrameworks Essentials
OpenFrameworks Essentials

OpenFrameworks Essentials: Create stunning, interactive openFrameworks-based applications with this fast-paced guide

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OpenFrameworks Essentials

Chapter 2. Creating Your First openFrameworks Project

In the previous chapter, we installed openFrameworks and learned how to build and run its example projects. It's time to start our own project! So, in this chapter, we are going to develop a sketch of the video synthesizer and explore the basics of 2D graphics with openFrameworks.

We will cover the following topics:

  • Creating a new project with Project Generator
  • openFrameworks project's structure
  • Setting up screen size and frame rate
  • Drawing geometric primitives, such as lines, triangles, and circles
  • Drawing patterns from geometric primitives

Creating and running a new project

Let's create a new openFrameworks project. The simplest way to do this is to use the Project Generator wizard included in openFrameworks for OS X, Windows, Linux, and iOS.

Note

Another way to create a new project is to copy any openFrameworks example to the apps/myApps folder (or any other subfolder of the apps folder) and use it from scratch for your project. The first thing you would need to do after copying is rename the project; please see the documentation of your IDE for details on how to do this.

Creating a project

To create a project, follow these steps:

  1. Run Project Generator : Open the ProjectGenerator_osx folder (in OS X), ProjectGenerator (in Windows), or apps/projectGenerator (in Linux) and run the executable named projectGenerator.

    Tip

    In Linux, Project Generator needs to be built before running; see the details on building a project in the Running your first example section of Chapter 1, Getting Started with openFrameworks.

    You will see the...

Discovering the project's code structure

Open the project's VideoSynth folder and find the src folder there. It contains the project's source code files, as shown in the following screenshot:

Discovering the project's code structure

The project's folder contents (the center column) and its source code files placed in the src folder (the right column)

There are three source files:

  • main.cpp: This file contains the code to initiate a window and run the app. We will leave it unchanged.
  • ofApp.h: This file is a declaration of the ofApp application class, which consists of a declaration of the functions, such as setup(), update(), draw(), and some others. Currently, we do not need to add anything there.
  • ofApp.cpp: This file contains definitions of declared functions. This is the file we will edit right now.

The following functions, declared in the ofApp class, are called by the openFrameworks engine:

  • setup(): This function is called once at the beginning of the application execution. This is the place to implement a project...

Setting up the screen

The very first thing to code is to set up the global attributes: the project's window title, screen size, rendering frame rate, and background color. To achieve this, add the following lines to the ofApp::setup() function's body in the ofApp.cpp file:

ofSetWindowTitle( "Video synth" );
ofSetWindowShape( 1280, 720 );
ofSetFrameRate( 60 );
ofBackground( ofColor::white );

Tip

Downloading the example code

You can download the example code files from your account at http://www.packtpub.com for all the Packt Publishing books you have purchased. If you purchased this book elsewhere, you can visit http://www.packtpub.com/support and register to have the files e-mailed directly to you.

This code consists of calling four openFrameworks functions, which set the window title to Video synth, the project's drawing area size with width of 1280 pixels and height of 720 pixels, the frame rate to 60 Hz, and the white background, respectively.

Note

All openFrameworks...

Centering the coordinate system

By default, in openFrameworks (and in most computer programs dealing with 2D graphics), the center of the screen coordinate system is placed in the top-left corner of the screen. The horizontal axis is directed to the right and the vertical axis is directed downwards. The measurement unit is the pixel.

For a screen with size 1280 × 720 pixels, the top-left corner has the coordinates (0, 0) and the bottom-right corner has the coordinates (1280-1, 720-1) = (1279, 719), as shown in the following screenshot:

Centering the coordinate system

This shows the default coordinate system

We are planning to implement generative graphics, which is situated around the screen center. To make the code easier, it's a good approach to move the coordinate system origin to the screen center by adding the following lines to the ofApp::draw() function:

ofPushMatrix();
ofTranslate( ofGetWidth() / 2, ofGetHeight() / 2 );
//----
//...       We will place our drawing code here
//----
ofPopMatrix();

The ofPushMatrix...

A simple drawing

The simplest thing that can be drawn with openFrameworks is a geometric primitive such as a line, rectangle, or circle. Before drawing, we should set the drawing color using the ofSetColor function and then draw primitives using commands such as ofLine, ofRect, ofTriangle, and ofCircle (they draw a line, rectangle, triangle, and circle respectively). Let's consider setting the color and then drawing functions in detail.

Setting drawing color

The ofSetColor function switches the drawing color to a specified color. There are several overloaded versions of this function:

  • The most universal form lets us explicitly specify the red, green, blue, and alpha (opaqueness) components of the color:
    ofSetColor( 255, 0, 0, 255 );

    The arguments are integers from 0 to 255, which correspond to red, green, or blue color components and alpha color components. In our example, we will get the red opaque color because the red component is maximal, the blue and green components are zero, and...

Geometric patterns

The idea of creating a picture by repeatedly drawing several geometric primitives and shifting, rotating, or resizing them in small amounts is known from ancient times. The resultant picture is called a geometric pattern.

Tip

Ethnic ornaments are exciting examples of geometric patterns. Check Google's image search results on the geometric pattern and ethnic ornament to boost your creativity on the topic.

Creating geometric patterns with a computer is super easy, and it's a must-have feature of any video synthesizer. In the rest of the chapter, we will implement a simple but powerful pattern's type in detail, which we call a stripe pattern.

The stripe pattern

A stripe pattern is formed by drawing the geometric primitives repeatedly, placing their centers along some (invisible) curve, such as a straight line, a curved line, or even a spiral. We will call this curve a base curve.

Tip

The reason of naming is that the resultant figure sometimes resembles a stripe.

A...

Summary

In this chapter, we created a new project and set up its screen size and frame rate. Also, you learned the basics of 2D graphics with openFrameworks by drawing geometric primitives and stripe patterns.

The project we built is a sketch of the video synthesizer. In the next chapter, we will enhance it by adding GUI, which lets us change drawing parameters interactively.

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Description

If you are a programmer, visual artist, or designer with experience in creative coding, and want to use openFrameworks to create fun, stunning, and interactive applications, this is the book for you. Basic knowledge of programming languages, such as C++, Java, Python, or JavaScript, will be enough to proceed with the book.

What you will learn

  • Install openFrameworks and create a new project Generate 2D and 3D graphics Mix images and videos and process them with shaders Add GUI controls and adjust them from external devices and apps using the OSC protocol Control parameters with a timer, Perlin noise, and sound and text files Use the Arduino to control your application Build a video synthesizer project Run your project on iOS, Android, and Raspberry Pi devices

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Publication date : Apr 23, 2015
Length: 206 pages
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Language : English
ISBN-13 : 9781784390532
Category :
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Concepts :
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Table of Contents

12 Chapters
1. Getting Started with openFrameworks Chevron down icon Chevron up icon
1. Getting Started with openFrameworks
What is openFrameworks?
Installing openFrameworks
Running your first example
The video synthesizer application
Summary
2. Creating Your First openFrameworks Project Chevron down icon Chevron up icon
2. Creating Your First openFrameworks Project
Creating and running a new project
Discovering the project's code structure
Setting up the screen
Centering the coordinate system
A simple drawing
Geometric patterns
Summary
3. Adding a GUI and Handling Keyboard Events Chevron down icon Chevron up icon
3. Adding a GUI and Handling Keyboard Events
Creating a GUI using the ofxGui addon
Implementing a simple GUI panel with sliders
Implementing the autosave feature
Creating groups of controls
Implementing a checkbox, a color selector, and a 2D slider
Handling keyboard events
Implementing the matrix pattern generator
Summary
4. Working with Raster Graphics – Images, Videos, and Shaders Chevron down icon Chevron up icon
4. Working with Raster Graphics – Images, Videos, and Shaders
Raster images in openFrameworks
Drawing an image file
Playing a video file
Grabbing a live video from a camera
Mixing layers using additive blending
Creating the video effect with a shader
Summary
5. Creating 3D Graphics Chevron down icon Chevron up icon
5. Creating 3D Graphics
Introduction to 3D graphics with openFrameworks
Drawing a wireframe sphere
Creating a camera
Drawing a solid sphere
Texturing the sphere
Mixing 2D and 3D with the GUI
Deforming a sphere
Summary
6. Animating Parameters Chevron down icon Chevron up icon
6. Animating Parameters
Using time values for a parameter's automation
Using the level of sound for a parameter's automation
Capturing sound from a sound card's input and measuring its level
Reading data from a text file
Controlling automation
Summary
7. Distributed and Physical Computing with Networking and Arduino Chevron down icon Chevron up icon
7. Distributed and Physical Computing with Networking and Arduino
Distributed computing with networking
Networking in openFrameworks
Implementing the OSC messages receiver
Creating an OSC sender with openFrameworks
Creating OSC senders with TouchOSC, Python, and Max/MSP
Physical computing with Arduino
Programming an Arduino board
Summary
8. Deploying the Project on iOS, Android, and Raspberry Pi Chevron down icon Chevron up icon
8. Deploying the Project on iOS, Android, and Raspberry Pi
Running the project on an iOS device
Deploying the project on an iOS device
Running the project on an Android device
Running the project on Raspberry Pi
Summary
9. Further Resources Chevron down icon Chevron up icon
9. Further Resources
Enhancing the video synthesizer project
Getting more information on openFrameworks
Debugging and speeding up your code
Summary
A. Video Synthesizer Reference Chevron down icon Chevron up icon
A. Video Synthesizer Reference
The desktop version
iOS and Android versions
Raspberry Pi version
Summary
B. openFrameworks Quick Reference Chevron down icon Chevron up icon
B. openFrameworks Quick Reference
Application
2D drawing
The GUI
Multimedia and other classes
Mathematical, timer, and conversion functions
Summary
Index Chevron down icon Chevron up icon
Index

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Amazon Customer Aug 30, 2021
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I am not a programmer, though I have a bit of basic programming experience. This book is clear enough so that I can understand it and I can try out all the examples and use them as a basis for my own experiments.
Amazon Verified review Amazon
Yoichi Nagashima Jun 03, 2015
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At first, I again strongly recommend to read the first book of the author "openFrameworks Essentials" for people who want to expand the possibility in designing interactive multimedia. I enjoyed that first book as my first experience about the openFrameworks. And I understood that openFrameworks can realize the same great projects like Max/MSP/jitter or Processing, but the final application is "standard", not as special environments : this is the open source culture, of course.This second book is presented by the author and a video artist. The author Denis Perevalov is a enthusiastic and sincere scientist, and he has collaborated with many artists in many projects. If you search his name in YouTube or in Vineo, you will enjoy many amazing interactive multimedia projects. Though I had thought that the title of this book "Essentials" means the advanced level from the first book, I understand this more thin book is rather practical version for students. The first book is a textbook, and this second book is the manual to develop an exciting "Video Synthesizer" for amazing VJ performance.In Processing website, Arduino website and Raspberry Pi website, there are standard "Tutorial" page for beginners. We are overwhelmed by the texts introducing many knowledges in an orderly manner, and fear that we cannot do anything before we do not master all of them. This is a problem of "text book" generally. On the contrary, this new book presents the "Video Synthesizer Structure" at the beginning. We can overview of the whole project constructed by each modules of openFrameworks, and we can study/test/arrange any part of them in response to our own request.The traditional education in design was "learn, then produce". But 21st-century design education is "producing with study", because we can get huge knowledges/know-hows by Internet and the system works realtime. This culture "Sketching" (Sketching in Hardware) expands by the open source culture in the world. We can be happy all by the open source culture and Internet - this book informs us the happy future in design, I think. I want to recommend with confidence this book to my students and research/design/education communities.
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Cameren Aug 30, 2015
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Step by step instructions to create a video synthesizer work really well. Great introduction into openFrameworks.
Amazon Verified review Amazon
Dolores Joya May 13, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book covers a build up of project work which is closer to a real application of the knowledge. Denis covers a lot of the more sought after techniques in this book. I've read Denis Perevalov's first book Mastering openFramewoks: Creative Coding Demystified and was quickly on my feet with OpenFrameworks. I did a little research and discovered he has taught this subject for several years and his teaching style comes through. I would read openFrameworks Essentials to get the feel of building a full project and read Mastering OpenFrameworks for a walk-thru or reference for what OpenFrameworks can do.
Amazon Verified review Amazon
cloud_canvas Aug 08, 2015
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I cannot praise this book highly enough. The project you build looks awesome, and the extent they take you to with adding all kinds of common hooks into it (LFOs for modulation, OSC hooks, reading serial values from a microcontroller) are incredibly useful for every type of creative coding project... these are things that I need to do all the time.Make sure to save a zip of your project at the end of Chapter 3 like they tell you to do. Even though it only comprises about 40 pages towards the end of the book, there's a final sprint of executing a diminutive version of the final project on literally every single platform that oF can handle that's exhilarating!This book covers everything it should in the best way possible with the most satisfying result. I am VERY impressed, and I can't wait to tie into the authors' other openFrameworks book.
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About the author

Profile icon Denis Perevalov
Denis Perevalov
Denis Perevalov is a lecturer and programmer from Ekaterinburg, Russia. He teaches creating interactive media projects at Ekaterinburg Academy of Contemporary Art, and teaches 3D graphics at Ural Federal University. Also he is scientist the Krasovsky Institute of Mathematics and Mechanics.
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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.