MT4j - Multitouch For Java

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MT4j - Multitouch for Java™ - is an open source Java™ framework, created for rapid development of visually rich applications.
MT4j is designed to support different kinds of input devices with a special focus on multi-touch support.

MT4j Features

can be used for 2D, 3D or 2.5D (pseudo-3D) applications
cross-platform - currently tested under Windows 7™, XP™, Vista™, Ubuntu Linux and Mac OSX™
extensible, component based scene graph structure (similar to Java™'s swing framework)
input abstraction layer - support for all sorts of input devices can be easily added
supports the new Windows 7™ Touch features natively and all the compliant multi-touch hardware
supports Apple™'s multi-touch mice and trackpads
supports the TUIO protocol, which is provided by finger and object tracking software such as Reactivision, CCV or Touché
flexible multitouch gesture system - you can define your own multitouch gestures
the most common multitouch gestures are already included and can be registered modularly with any component for a pluggable behaviour changeable at runtime
software or hardware accelerated graphics rendering (using OpenGL)
includes many graphical objects e.g.: rectangles, round rectangles, ellipses, polygons, lines, triangle meshes, spheres, cubes, etc. with support for textures, gradients, fill- and outline color
includes prebuilt UI components e.g.. buttons, text, lists, sliders and a multitouch enabled keyboard
support for loading and fast rendering of vector graphics from Scalable Vector Graphics (SVG) files
supports bitmap and vector fonts (SVG and True Type Fonts)
imports 3D objects from .3ds and .obj files with textures and creates normals for smooth shading
precise picking/selection of all geometric objects in 2D or 3D space - most gestures are supported in 3D
animation support
built on top of Processing, which allows you to use its many features and libraries
test your multitouch application by using one - or even multiple mice connected to your pc (Windows, Linux)
MT4j is open source and released under the GPL License.