usagi.rb

require "rubygems"
require "opengl"
require "glut"

include GL, Glut

MARGIN = 10
WIDTH  = 34
HEIGHT = 12
SCALE  = 15

LINE_WIDTH = 3

TOTAL_W = WIDTH  + MARGIN * 2
TOTAL_H = HEIGHT + MARGIN * 2

class Kanji
  def initialize(lines)
    @lines = lines
  end

  def draw
    @lines.each { |line|
      GL.Begin LINES
      Vertex3f   (line.x1 + MARGIN) * 2 / TOTAL_W.to_f - 1.0,
               - (line.y1 + MARGIN) * 2 / TOTAL_H.to_f + 1.0,
                 0.0
      Vertex3f   (line.x2 + MARGIN) * 2 / TOTAL_W.to_f - 1.0,
               - (line.y2 + MARGIN) * 2 / TOTAL_H.to_f + 1.0,
                 0.0
      GL.End
    }
  end
end

class Line
  attr_reader :x1, :y1, :x2, :y2

  def initialize(x1, y1, x2, y2)
    @x1, @y1, @x2, @y2, = x1, y1, x2, y2
  end
end

l00 = Line.new(3, 0, 3, 1)
l01 = Line.new(1, 1, 5, 1)
l02 = Line.new(2, 1, 2, 3)
l03 = Line.new(4, 1, 4, 3)
l04 = Line.new(0, 3, 6, 3)
l05 = Line.new(3, 3, 3, 6)
l06 = Line.new(1, 4, 5, 4)
c1  = Kanji.new([l00, l01, l02, l03, l04, l05, l06])

l07 = Line.new(10, 0,  6,  3  )
l08 = Line.new( 6, 3,  6,  9  )
l09 = Line.new( 6, 9, 10,  6  )
l10 = Line.new(10, 3, 10,  9  )
l11 = Line.new(10, 9,  6, 12  )
l12 = Line.new(12, 3, 12, 12  )
l13 = Line.new(12, 3, 16,  3  )
l14 = Line.new(16, 3, 16,  9  )
l15 = Line.new(16, 9, 14, 10.5)
c2  = Kanji.new([l07, l08, l09, l10, l11, l12, l13, l14, l15])

l16 = Line.new(19, 0, 16, 3)
l17 = Line.new(19, 0, 22, 3)
l18 = Line.new(18, 2, 20, 2)
l19 = Line.new(17, 3, 21, 3)
l20 = Line.new(19, 0, 19, 6)
l21 = Line.new(18, 5, 19, 6)
l22 = Line.new(20, 5, 19, 6)
l23 = Line.new(16, 6, 22, 6)
c3  = Kanji.new([l16, l17, l18, l19, l20, l21, l22, l23])

l24 = Line.new(22, 2, 28, 2)
l25 = Line.new(25, 0, 25, 6)
l26 = Line.new(25, 2, 22, 5)
l27 = Line.new(25, 2, 28, 5)
c4  = Kanji.new([l24, l25, l26, l27])

l28 = Line.new(16, 9, 22,  9)
l29 = Line.new(19, 6, 19, 12)
c5  = Kanji.new([l28, l29])

l30 = Line.new(25   ,  6, 25,  8)
l31 = Line.new(22   ,  8, 28,  8)
l32 = Line.new(25   ,  8, 22, 12)
l33 = Line.new(24.25,  9, 27,  9)
l34 = Line.new(27   ,  9, 27, 12)
l35 = Line.new(27   , 12, 26, 11)
c6  = Kanji.new([l30, l31, l32, l33, l34, l35])

l36 = Line.new(28  ,  7   , 34,  7   )
l37 = Line.new(30  ,  6.5 , 30,  7.5 )
l38 = Line.new(32  ,  6.5 , 32,  7.5 )
l39 = Line.new(30  ,  8   , 30,  9.5 )
l40 = Line.new(30  ,  8   , 32,  8   )
l41 = Line.new(32  ,  8   , 32,  9.5 )
l42 = Line.new(30  ,  8.75, 32,  8.75)
l43 = Line.new(30  ,  9.5 , 32,  9.5 )
l44 = Line.new(28  , 10   , 34, 10   )
l45 = Line.new(30.5,  9.5 , 28, 12   )
l46 = Line.new(31.5,  9.5 , 34, 12   )
l47 = Line.new(30  , 10.5 , 30, 12   )
l48 = Line.new(30  , 10.5 , 32, 10.5 )
l49 = Line.new(32  , 10.5 , 32, 12   )
l50 = Line.new(30  , 11.25, 32, 11.25)
l51 = Line.new(30  , 12   , 32, 12   )
c7  = Kanji.new([l36, l37, l38, l39, l40, l41, l42, l43,
                 l44, l45, l46, l47, l48, l49, l50, l51])

display = proc {
  Clear(GL::COLOR_BUFFER_BIT)
  Color3f 1.0, 1.0, 1.0
  LineWidth(LINE_WIDTH)

  [c1, c2, c3, c4, c5, c6, c7].each(&:draw)

  glutSwapBuffers
}

timer = proc {
  Rotate(1.0, 0.0, 1.0, 0.0)
  Rotate(1.0, 0.0, 0.0, 0.2)
  glutPostRedisplay
  glutTimerFunc(100, timer, 0)
}

glutInit
glutInitWindowSize(*[WIDTH, HEIGHT].map { |e| (e + MARGIN * 2) * SCALE })
glutCreateWindow("Usagi")

glClearColor(0.0, 0.0, 0.0, 0.0)

glutDisplayFunc(display)
glutTimerFunc(100, timer, 0)

Enable(GL_LINE_SMOOTH);
Enable(GL_BLEND);
BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

glutMainLoop