Pythagoras is a collection of geometry classes, the implementations of which were adapted from the Apache Harmony project. The Pythagoras library aims to provide performant, portable geometry routines for projects that cannot make use of java.awt.geom (for example for use in GWT projects or Android projects).

Design

Some restructuring of the java.awt.geom classes was undertaken to meet certain design goals.

The library supports garbage creation avoidance for applications which are sensitive to garbage collection pauses, like video games. For example, in cases where entities return a Rectangle containing their bounds, a corresponding method exists which accepts a Rectangle into which to write the bounds.
The library attempts to minimize the size of its instances, by avoiding the inclusion of any fields that are not essential to the function of a particular geometry entity. Thus no cached hash codes or cached computed bounds are maintained.
Helper methods associated with a given geometric primitive are separated into a separate utility class for that primitive. For example line-related primitives are in a class named Lines.
The library is specialized on the primitive types rather than attempting to support all types in a single class hierarchy. pythagoras.f and pythagoras.d provide essentially the same functionality using 32-bit and 64-bit floating point values throughout. pythagoras.i is specialized on int and contains none of the curved geometry classes. It is targeted toward applications that need "pixel geometry".

Documentation

API documentation is available.

Maven artifact

Pythagoras can be obtained via Maven Central: com.samskivert:pythagoras:1.0. Or you can download the pre-built jar file.

License

Pythagoras is released under the Apache License, Version 2.0 which can be found in the LICENSE file and at http://www.apache.org/licenses/LICENSE-2.0 on the web.