class IRB::RubyModel - RDoc Documentation

# class IRB::RubyModel

### Public Class Methods

new() click to toggle source

    # File lib/irb/easter-egg.rb, line 63
    def initialize
      @faces = init_ruby_model
    end

### Public Instance Methods

init_ruby_model() click to toggle source

    # File lib/irb/easter-egg.rb, line 67
    def init_ruby_model
      cap_vertices    = (0..5).map {|i| Vec.new(*Complex.polar(1,  i        * Math::PI / 3).rect, 1) }
      middle_vertices = (0..5).map {|i| Vec.new(*Complex.polar(2, (i + 0.5) * Math::PI / 3).rect, 0) }
      bottom_vertex   = Vec.new(0, 0, -2)

      faces = [cap_vertices]
      6.times do |j|
        i = j-1
        faces << [cap_vertices[i], middle_vertices[i], cap_vertices[j]]
        faces << [cap_vertices[j], middle_vertices[i], middle_vertices[j]]
        faces << [middle_vertices[i], bottom_vertex, middle_vertices[j]]
      end

      faces
    end

render_frame(i) { |p1, p2| ... } click to toggle source

    # File lib/irb/easter-egg.rb, line 83
    def render_frame(i)
      angle = i / 10.0
      dir = Vec.new(*Complex.polar(1, angle).rect, Math.sin(angle)).normalize
      dir2 = Vec.new(*Complex.polar(1, angle - Math::PI/2).rect, 0)
      up = dir.cross(dir2)
      nm = dir.cross(up)
      @faces.each do |vertices|
        v0, v1, v2, = vertices
        if v1.sub(v0).cross(v2.sub(v0)).dot(dir) > 0
          points = vertices.map {|p| [nm.dot(p), up.dot(p)] }
          (points + [points[0]]).each_cons(2) do |p1, p2|
            yield p1, p2
          end
        end
      end
    end