math_demo_two

Updated random-graphics by TricksterGuy (aka Brandon Whitehead) from an early version of ruby-processing to propane (a standalone version of ruby-processing for propane-3.3.6 and using jruby-9.1.15.0). The original was done as a CS exercise (CS3451 project 5 Georgia Tech), using an early version of ruby-processing-0.8 (released 19 Apr 2008), at which time the processing guys had not implemented PVector¹ and there wasn't the Vec2D class which was available with later version of ruby-processing (and hence JRubyArt and propane) so Brandon implemented his own Vector class. Here we make use propane Vec2D class and extend it to add functionality required by Brandons code. Since recent versions of processing the export to Applet is no longer available, however running this app is a simple as installing jruby and the following:-

jgem install propane
jruby random-graphics.rb

Or creating a gem and installing locally:-

rake # to create gem and run tests
jgem install math_demo_two-1.0-java.gem
math_demo_two # then run

It was Brandons idea to do the implementation in ruby-processing, Jarek having produced skeleton code in processing for students to follow (quite a brave choice at the time). Today many people rely on some version of John Lloyds Quickhull3D in java in processing sketches to create meshes. Such as Lee Byron mesh processing or toxiclibs by Karsten Schmidt. You can access toxiclibs in propane and JRubyArt by installing the gem.

Another feature not available with early versions of ruby-processing is the load_library function that facilitates the use of ruby or java libraries in your sketches. Here we create the geometry library, so that we can separate the sketch file from the supporting files.

1:PVector could not be used instead of Vector because it is confused as to whether it is a 2D vector or a 3D vector see its cross product implementation