Module: AkatsukiFace

Defined in:
lib/ext/projector/projector.rb

Constant Summary collapse

SCALE =

body size: 1040mm 1450mm 1400mm

Vector[1040.0/1450.0, 1.0, 1400.0/1450.0, 1.0]
FACES = 
[
  {
    'label' => 'loof',
    'angle' => -90.0, 'axis' => Vector[1.0, 0.0, 0.0, 1.0],
    'texture' => [0.00, 0.00, 0.25, 0.50], # left, top, width, height
  },
  {
    'label' => 'front',
    'angle' => 0.0, 'axis' => Vector[0.0, 1.0, 0.0, 1.0],
    'texture' => [0.00, 0.50, 0.25, 0.50],
  },
  {
    'label' => 'floor',
    'angle' => +90.0, 'axis' => Vector[1.0, 0.0, 0.0, 1.0],
    'texture' => [0.25, 0.00, 0.25, 0.50],
  },
  {
    'label' => 'right',
    'angle' => +90.0, 'axis' => Vector[0.0, 1.0, 0.0, 1.0],
    'texture' => [0.25, 0.50, 0.25, 0.50],
  },
  {
    'label' => 'back',
    'angle' => +180.0, 'axis' => Vector[0.0, 1.0, 0.0, 1.0],
    'texture' => [0.50, 0.50, 0.25, 0.50],
  },
  {
    'label' => 'left',
    'angle' => +270.0, 'axis' => Vector[0.0, 1.0, 0.0, 1.0],
    'texture' => [0.75, 0.50, 0.25, 0.50],
  },
]
MESH =

divide MESH x MESH rectangles per a FACE

2
VERTEXS =

the modeling unit: right-hand 3d object coordinates

[
  Vector[0.0, 0.0, +1.0, 1.0], # left bottom
  Vector[1.0, 0.0, +1.0, 1.0], # right bottom
  Vector[1.0, 1.0, +1.0, 1.0], # right top
  Vector[0.0, 1.0, +1.0, 1.0], # left top
]
TEXTURES =

the texture unit: left-hand 2d Gtk::DrawingArea coordinates

[
  Vector[0.0, 1.0], # left bottom
  Vector[1.0, 1.0], # right bottom
  Vector[1.0, 0.0], # right top
  Vector[0.0, 0.0], # left top
]

Class Method Summary collapse

Class Method Details

.create ⇒ Object 



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# File 'lib/ext/projector/projector.rb', line 73

def create
  scale = Matrix3d::scale(SCALE)
  divide = MESH.to_f
  FACES.inject([]) do |list, face|
    transform = scale * Matrix3d::rotate(face['angle'], face['axis'])
    (0 ... MESH).to_a.product((0 ... MESH).to_a).each do |part|
      x, y = part.map{|i| i.to_f }
      v = VERTEXS.map {|c|
        transform * Vector[
          (c[0] + x) * 2.0 / divide - 1.0,
          (c[1] + divide - 1.0 - y) * 2.0 / divide - 1.0,
          c[2],
          c[3]
        ]
      }
      t = TEXTURES.map {|c|
        left, top, width, height = face['texture']
        Vector[
          (c[0] + x) * width / divide + left,
          (c[1] + y) * height / divide + top
        ]
      }

      # to keep simple calculations on S^{-1},
      # we assume s1 - s0 = (s00, 0.0), s2 - s0 = (0.0, s11)
      # left-bottom triangle counterclockwise
      #   (left, bottom) -> (right, bottom) -> (left, top)
      list.push({
        'vertex' => [0, 1, 3].map {|i| v[i] },
        'texture' => [0, 1, 3].map {|i| t[i] },
      })
      # right-top triangle counterclockwise
      #   (right, top) -> (left, top) -> (right, bottom)
      list.push({
        'vertex' => [2, 3, 1].map {|i| v[i] },
        'texture' => [2, 3, 1].map {|i| t[i] },
      })
    end
    list
  end
end