Glossary

In ruby everything is an object including numeric values

Processing provides degrees(val) and radians(val) as convenience methods, in ruby-processing Numeric has been extended to provide:-

• val.degrees (eg PI.degrees)
• val.radians (eg 80.radians)

the vanilla processing versions are no longer available since ruby-processing-2.6.0

The Range class has been similary extended to provide the clip method

Usage val = (0...width).clip val where val is the value you want to constrain, this function is used to implement the processing val = constrian(lower, upper, val) functionality (since ruby-processing-2.6.3), although it may be convenient to use clip instead in ruby-processing.

• map1d(val, range_in, range_out) works like processings map(val, start_in, end_in, start_out, end_out) just uses range instead of discrete values. The processing version is also available, and should not get confused with ruby map function.

Library loading

• load_library :vecmath
• load_libraries :fastmath, :vecmath

The load_library and load_libraries are synonyms, it just looks nicer to use the appropriate form. They allow for the easy loading both java and ruby libraries. Libraries can be in adjacent library folder, in the core ruby-processings library folder or the sketchbook/libraries folder (or similar for Mac). You should prefer to use symbol as above but string 'vecmath' is supported. Since ruby-1.9.3 you can load local files with require_relative which might be better in some cases.