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(maintained) some useful application utilities including render scaling, scene management, & quad warping
C++ Objective-C++ Objective-C Other
Branch: master


OpenFrameworks app utilities

Copyright (c) Dan Wilcox 2011-2013

BSD Simplified License.

For information on usage and redistribution, and for a DISCLAIMER OF ALL WARRANTIES, see the file, "LICENSE.txt," in this distribution.

See Documentation on Github and the OpenFrameworks Forum post.

OpenFrameworks is a cross platform open source toolkit for creative coding in C++.


ofxAppUtils is a set of utilities for OpenFrameworks application development including:

  • ofxApp: an ofBaseApp/ofxiPhoneApp extension with optional screen scaling transformer & scene manager
  • ofxScene: a mini ofBaseApp/ofxiPhoneApp for writing stand alone scenes
  • ofxSceneManager: handles a list of scenes using a std::map
  • ofxTransformer: open gl transformer for origin translation, screen scaling, mirroring, and quad warping
  • ofxQuadWarper: an open gl matrix quad warper (useful for oblique projection mapping)
  • ofxTimer: a simple millis-based timer
  • ofxMovingAverage: a simple linear moving average
  • ofxParticle: a simple time-based particle base class
  • ofxParticleSystem: an auto manager for ofxParticles
  • ofxBitmapString: a stream interface for ofDrawBitmapString

All ofBaseApp & ofxiOSApp callbacks are handled down to the scene level.


To use ofxAppUtils, first you need to download and install Open Frameworks. ofxAppUtils is currently developed against the latest stable version of Open Frameworks on github.

To get a copy of the repository you can download the source from or, alternatively, you can use git clone:

git clone git://

The addon should sit in openFrameworks/addons/ofxAppUtils/.


You will may also need the following addon dependencies:

  • ofxGui: included with OpenFrameworks

To enable the ofxGui transformer panel, include ofxTransformerPanel.h, create an "ofxTransformerPanel" object, and set the transformer in ofxTransformerPanel::setup().

Running the Example Project

The example projects are in the appUtilsExample & appUtilsIOSExample folders.

Project files for the examples are not included so you will need to generate the project files for your operating system and development environment using the OF ProjectGenerator which is included with the OpenFrameworks distribution.

Point the ProjectGenerator to addons/ofxAppUtils, change the project name to the exact name of the example you want to generate (ie appUtilsExample), and make sure to choose ofxAppUtils (& optionally ofxGui for appUtilsExample) from the addons. Hitting "Generate Project" will populate that example with the project files you will need to build it.


Open the Xcode project, select the appUtilsExample-Debug scheme, and hit "Run".


Open the Code::Blocks .cbp and hit F9 to build. Optionally, you can build the example with the Makefile.

To build and run it on the terminal:

make run


An example Visual Studio solution as well as a Codeblocks workspace are included.

Adding ofxAppUtils to an Existing Project


Select ofxAppUtils and other addons used by your project from the available addons in the ProjectGenerator, select the parent folder of your project, and set the exact name of the existing project in the text box. This will overwrite the existing project files with new ones that now include ofxAppUtils.

Note: you will lose any custom settings you've added manually to your project.

Manual Method

Note: These instructions are for manually adding ofxAppUtils to an existing project. You do not need to follow these steps if you use the ProjecGenerator app, except for adding the OFX_APP_UTILS defines.

If you want to add ofxAppUtils to another project, you need to make sure you include the src folders:



  • create a new group "ofxAppUtils"
  • drag these directories from ofxAppUtils into this new group: ofxAppUtils/src
  • you also need to add the following addon dependencies (if you're using them) in a similar manner:
    • ofxGui
  • make sure to remove any of the example folders in the Xcode project tree for any of the addons you've added manually

For Linux (Makefiles & Codeblocks):

  • edit addons.make in your project folder and add the following line to the end of the file:

For Codeblocks (Win):

  • add the ofxAppUtils sources to the project:
    • right-click on your project in the project tree
    • select "Add Files Recursively ..."
    • navigate and choose the ofxAppUtils/src folder
  • add defines, search paths, and libraries to link:
    • right-click on your project in the project tree
    • select "Build options..."
    • make sure the project name is selected in the tree (not release or debug)
    • select the "Compiler settings" tab
    • select the "Search directories" tab, click add the search paths:

For Visual Studio:

  • drag the ofxApputils/src folder onto the project tree
  • right click on the project in the project tree and select Properties
  • set the Configuration to All Configurations
  • add the defines and search paths:
    • add to the search paths in Configuration Properties->C/C++->General->Additonal Include Directories:

Extending Your BaseApp

There are two changes you need to make to extend your app with the ofApputils ofxApp class which handles all the automagic:

  • your base app needs to inherit from ofxApp in your testApp.h
    class testApp : public ofBaseApp { 
    // becomes
    class testApp : public ofxApp { 
  • you need to run your app with the app utils in main.cpp
    ofRunApp(new testApp());
    // becomes
    ofRunAppWithAppUtils(new testApp());

That's it. Check the example testApp::setup() for more info on startup settings.

Note: this is completely optional. You can always handle the transforms etc yourself using an ofxTransformer instance, etc.


Internally, calling ofRunAppWithAppUtils actually creates a wrapper ofBaseApp which then runs the given ofxApp. As a result, calling ofGetAppPtr() does not work correctly as it returns a pointer to the wrapper and not the app itself.

In order to fix this, there is a new function added with ofxAppUtils called ofxGetAppPtr() (note the "x") which returns the correct pointer. If you are porting existing code, make sure to change any ofGetAppPtr() calls to ofxGetAppPtr().


You can help develop ofxAppUtils on GitHub:

Create an account, clone or fork the repo, then request a push/merge.

If you find any bugs or suggestions please log them to GitHub as well.

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