ArcBall functionality for processing (ruby versions) as gem

Example Usage

The sketch class need to to inherit from PApplet to work and self should return such an instance. The following is a propane example. Drag mouse to rotate. Hold down 'x', 'y' or 'z' keys to constrain axis of rotation, mouse-wheel to zoom.

class ArcBallBox < Propane::App
  ############################
  # Use mouse drag to rotate
  # the arcball. Use mousewheel
  # to zoom. Hold down x, y, z
  # to constrain rotation axis.
  ############################
  def setup
    sketch_title 'Arcball Box'
    Processing::ArcBall.init self, 300, 300
    fill 180
  end
  def draw
    background 50
    box 300, 300, 300
  end
  def settings
    size 600, 600, P3D
    smooth 8
  end
end
ArcBallBox.new

Since version 0.0.2, you can also fix rotation to one axis at initialization

require 'arcball'
def setup
  size(600, 600, P3D)
  smooth(8)
  Processing::ArcBall.constrain self #, :zaxis # default constrains to y-axis
  fill 180
end
def draw
  background(50)
  box(300, 300, 300)
end