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Edit File : easter-egg.rb \| Size : 3.61 KB
require "reline" module IRB class << self class Vec def initialize(x, y, z) @x, @y, @z = x, y, z end attr_reader :x, :y, :z def sub(other) Vec.new(@x - other.x, @y - other.y, @z - other.z) end def dot(other) @xother.x + @yother.y + @zother.z end def cross(other) ox, oy, oz = other.x, other.y, other.z Vec.new(@yoz-@zoy, @zox-@xoz, @xoy-@yox) end def normalize r = Math.sqrt(self.dot(self)) Vec.new(@x / r, @y / r, @z / r) end end class Canvas def initialize((h, w)) @data = (0..h-2).map { [0] w } @scale = [w / 2.0, h-2].min @center = Complex(w / 2, h-2) end def line((x1, y1), (x2, y2)) p1 = Complex(x1, y1) / 2 * @scale + @center p2 = Complex(x2, y2) / 2 * @scale + @center line0(p1, p2) end private def line0(p1, p2) mid = (p1 + p2) / 2 if (p1 - p2).abs < 1 x, y = mid.rect @data[y / 2][x] \|= (y % 2 > 1 ? 2 : 1) else line0(p1, mid) line0(p2, mid) end end def draw @data.each {\|row\| row.fill(0) } yield @data.map {\|row\| row.map {\|n\| " ',;"[n] }.join }.join("\n") end end class RubyModel def initialize @faces = init_ruby_model end 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 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 end private def easter_egg(type = nil) type \|\|= [:logo, :dancing].sample case type when :logo File.open(File.join(__dir__, 'ruby_logo.aa')) do \|f\| require "rdoc" RDoc::RI::Driver.new.page do \|io\| IO.copy_stream(f, io) end end when :dancing begin canvas = Canvas.new(Reline.get_screen_size) Reline::IOGate.set_winch_handler do canvas = Canvas.new(Reline.get_screen_size) end ruby_model = RubyModel.new print "\e[?1049h" 0.step do \|i\| # TODO (0..).each needs Ruby 2.6 or later buff = canvas.draw do ruby_model.render_frame(i) do \|p1, p2\| canvas.line(p1, p2) end end buff[0, 20] = "\e[0mPress Ctrl+C to stop\e[31m\e[1m" print "\e[H" + buff sleep 0.05 end ensure print "\e[0m\e[?1049l" end end end end end IRB.send(:easter_egg, ARGV[0]&.to_sym) if $0 == __FILE__ Back

Edit File : easter-egg.rb | Size : 3.61 KB

require "reline"

module IRB
  class << self
    class Vec
      def initialize(x, y, z)
        @x, @y, @z = x, y, z
      end

attr_reader :x, :y, :z

def sub(other)
        Vec.new(@x - other.x, @y - other.y, @z - other.z)
      end

def dot(other)
        @x*other.x + @y*other.y + @z*other.z
      end

def cross(other)
        ox, oy, oz = other.x, other.y, other.z
        Vec.new(@y*oz-@z*oy, @z*ox-@x*oz, @x*oy-@y*ox)
      end

def normalize
        r = Math.sqrt(self.dot(self))
        Vec.new(@x / r, @y / r, @z / r)
      end
    end

class Canvas
      def initialize((h, w))
        @data = (0..h-2).map { [0] * w }
        @scale = [w / 2.0, h-2].min
        @center = Complex(w / 2, h-2)
      end

def line((x1, y1), (x2, y2))
        p1 = Complex(x1, y1) / 2 * @scale + @center
        p2 = Complex(x2, y2) / 2 * @scale + @center
        line0(p1, p2)
      end

private def line0(p1, p2)
        mid = (p1 + p2) / 2
        if (p1 - p2).abs < 1
          x, y = mid.rect
          @data[y / 2][x] |= (y % 2 > 1 ? 2 : 1)
        else
          line0(p1, mid)
          line0(p2, mid)
        end
      end

def draw
        @data.each {|row| row.fill(0) }
        yield
        @data.map {|row| row.map {|n| " ',;"[n] }.join }.join("\n")
      end
    end

class RubyModel
      def initialize
        @faces = init_ruby_model
      end

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

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
    end

private def easter_egg(type = nil)
      type ||= [:logo, :dancing].sample
      case type
      when :logo
        File.open(File.join(__dir__, 'ruby_logo.aa')) do |f|
          require "rdoc"
          RDoc::RI::Driver.new.page do |io|
            IO.copy_stream(f, io)
          end
        end
      when :dancing
        begin
          canvas = Canvas.new(Reline.get_screen_size)
          Reline::IOGate.set_winch_handler do
            canvas = Canvas.new(Reline.get_screen_size)
          end
          ruby_model = RubyModel.new
          print "\e[?1049h"
          0.step do |i| # TODO (0..).each needs Ruby 2.6 or later
            buff = canvas.draw do
              ruby_model.render_frame(i) do |p1, p2|
                canvas.line(p1, p2)
              end
            end
            buff[0, 20] = "\e[0mPress Ctrl+C to stop\e[31m\e[1m"
            print "\e[H" + buff
            sleep 0.05
          end
        ensure
          print "\e[0m\e[?1049l"
        end
      end
    end
  end
end

IRB.send(:easter_egg, ARGV[0]&.to_sym) if $0 == __FILE__

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