Planetarium calibrate sketch in ruby-processing

load_libraries :planetarium, :control_panel
include_package 'codeanticode.planetarium'

attr_reader :cube_x, :cube_y, :panel, :hide, :camera, :grid

def setup
  # For the time being, only use square windows  
  size(600, 600, Dome::RENDERER)
  @camera = DomeCamera.new(self)
  @hide = false
  @grid = true
  control_panel do |c|
    c.title = "Control"
    c.look_feel "Metal"
    c.slider    :cube_x,  -width / 2.0 .. width / 2.0, -60.0
    c.slider    :cube_y,  -height / 2.0 .. height / 2.0, 60.0
    @panel = c
  end
end

def mouse_pressed
  @hide = false if hide  # use mouse click to restore control panel
end

# Called five times per frame.
def draw
  unless hide
    @hide = true
    panel.set_visible hide
  end
  face = camera.getFace
  case(face)
  when DomeCamera::POSITIVE_X
  background(240, 59, 31)
  when DomeCamera::NEGATIVE_X
  background(240, 146, 31)
  when DomeCamera::POSITIVE_Y
  background(30, 245, 0)
  when DomeCamera::NEGATIVE_Y
  background(30, 232, 156)
  when DomeCamera::POSITIVE_Z
  background(52, 148, 206)
  when DomeCamera::NEGATIVE_Z
  background(183, 115, 13)
  end

  push_matrix
  translate(width/2, height/2, 300)

  stroke(255)
  noFill

  push_matrix
  translate(cube_x, cube_y, 0)
  sphere_detail(8)
  sphere(30)
  pop_matrix

  lines_amount = 10
  (0 ... lines_amount).each do |i|
    ratio = i/(lines_amount - 1.0)
    line(0, 0, cos(ratio * TWO_PI) * 50, sin(ratio * TWO_PI) * 50)
  end
  pop_matrix
end

def key_pressed
  @grid = !grid
  (grid)? camera.set_mode(Dome::GRID) : camera.set_mode(Dome::NORMAL)
end