Class: GridGenerator::SquareOne::ElementFactory

Inherits:
Object
  • Object
show all
Defined in:
lib/grid_generator/square_one/element_factory.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(x:, y:, units:, shape:, offset:, colour:, opacity:) ⇒ ElementFactory

Returns a new instance of ElementFactory.



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# File 'lib/grid_generator/square_one/element_factory.rb', line 7

def initialize(x: , y:, units:, shape:, offset:, colour:, opacity:)
  @x, @y = x, y
  @units = units
  @shape = shape
  @offset = offset
  @colour = colour
  @opacity = opacity
end

Instance Attribute Details

#colour ⇒ Object (readonly)

Returns the value of attribute colour.



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# File 'lib/grid_generator/square_one/element_factory.rb', line 16

def colour
  @colour
end

#offset ⇒ Object (readonly)

Returns the value of attribute offset.



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# File 'lib/grid_generator/square_one/element_factory.rb', line 16

def offset
  @offset
end

#opacity ⇒ Object (readonly)

Returns the value of attribute opacity.



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# File 'lib/grid_generator/square_one/element_factory.rb', line 16

def opacity
  @opacity
end

#shape ⇒ Object (readonly)

Returns the value of attribute shape.



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# File 'lib/grid_generator/square_one/element_factory.rb', line 16

def shape
  @shape
end

#units ⇒ Object (readonly)

Returns the value of attribute units.



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# File 'lib/grid_generator/square_one/element_factory.rb', line 16

def units
  @units
end

#x ⇒ Object (readonly)

Returns the value of attribute x.



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# File 'lib/grid_generator/square_one/element_factory.rb', line 16

def x
  @x
end

#y ⇒ Object (readonly)

Returns the value of attribute y.



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# File 'lib/grid_generator/square_one/element_factory.rb', line 16

def y
  @y
end

Instance Method Details

#base_points ⇒ Object 



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# File 'lib/grid_generator/square_one/element_factory.rb', line 18

def base_points
  case shape
  when :edge
    [
      Matrix.column_vector([x+half_face_size-half_edge_width, y]),
      Matrix.column_vector([x+half_face_size+half_edge_width, y]),
      Matrix.column_vector([x+half_face_size, y+half_face_size])
    ]
  when :corner
    [
      Matrix.column_vector([x+half_face_size+half_edge_width, y]),
      Matrix.column_vector([x+face_size, y]),
      Matrix.column_vector([x+face_size, y+half_face_size-half_edge_width]),
      Matrix.column_vector([x+half_face_size, y+half_face_size])
    ] 
  when :middle
    [
      Matrix.column_vector([x+half_face_size+half_edge_width, y]),
      Matrix.column_vector([x+face_size, y]),
      Matrix.column_vector([x+face_size, y+face_size]),
      Matrix.column_vector([x+half_face_size-half_edge_width, y+face_size])
    ] 
  when :middle_flipped
    @base_points ||= [
      Matrix.column_vector([x+half_face_size-half_edge_width, y]),
      Matrix.column_vector([x+face_size, y]),
      Matrix.column_vector([x+face_size, y+face_size]),
      Matrix.column_vector([x+half_face_size+half_edge_width, y+face_size])
    ] 
  else
    raise ArgumentError, "unknown face shape: #{edge}"
  end
end

#build ⇒ Object 



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# File 'lib/grid_generator/square_one/element_factory.rb', line 84

def build
  GridGenerator::BaseElement.new(points: points, colour: colour, opacity: opacity)
end

#face_size ⇒ Object 



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# File 'lib/grid_generator/square_one/element_factory.rb', line 64

def face_size
  @face_size ||= 3 * units
end

#half_edge_width ⇒ Object 



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# File 'lib/grid_generator/square_one/element_factory.rb', line 56

def half_edge_width 
  @half_edge_width ||= half_face_size * Math.tan(Math::PI/12) 
end

#half_face_size ⇒ Object 



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# File 'lib/grid_generator/square_one/element_factory.rb', line 60

def half_face_size 
  @half_face_size ||= face_size / 2 
end

#offset_radians ⇒ Object 



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# File 'lib/grid_generator/square_one/element_factory.rb', line 52

def offset_radians
  offset*Math::PI/6
end

#points ⇒ Object 



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# File 'lib/grid_generator/square_one/element_factory.rb', line 80

def points
  base_points.map { |p| (rotation_matrix * (p - rotation_point)) + rotation_point }
end

#rotation_matrix ⇒ Object 



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# File 'lib/grid_generator/square_one/element_factory.rb', line 72

def rotation_matrix
  @rotation_matrix ||= Matrix[
    [Math.cos(offset_radians), -1*Math.sin(offset_radians)], 
    [Math.sin(offset_radians), Math.cos(offset_radians)]
  ]
end

#rotation_point ⇒ Object 



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# File 'lib/grid_generator/square_one/element_factory.rb', line 68

def rotation_point
  Matrix.column_vector([x+half_face_size, y+half_face_size])
end