Class: Laser::Cutter::Notching::PathGenerator

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/laser-cutter/notching/path_generator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(edge) ⇒ PathGenerator

This class generates lines that zigzag between two lines: the outside line, and the inside line of a single edge. Edge class encapsulates both of them with additional properties.



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# File 'lib/laser-cutter/notching/path_generator.rb', line 47

def initialize(edge)
  @edge = edge
end

Instance Attribute Details

#edge ⇒ Object

Returns the value of attribute edge.



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# File 'lib/laser-cutter/notching/path_generator.rb', line 42

def edge
  @edge
end

Instance Method Details

#add_boxes_when_in(dim_index, direction, k) ⇒ Object 



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# File 'lib/laser-cutter/notching/path_generator.rb', line 118

def add_boxes_when_in(dim_index, direction, k)
  v1 = k * direction * shift_vector(1, dim_index)
  v2 = k * direction * shift_vector(2, dim_index)
  p1 = edge.inside.p1.plus(v1)
  coords = []
  coords[d_index_along] = edge.inside.p1[d_index_along]
  coords[d_index_across] = edge.outside.p1[d_index_across]
  p2 = Geometry::Point[*coords]
  r1 = Geometry::Rect[p1, p2]

  p1 = edge.inside.p2.plus(v2)
  coords = []
  coords[d_index_along] = edge.inside.p2[d_index_along]
  coords[d_index_across] = edge.outside.p2[d_index_across]
  p2 = Geometry::Point[*coords]
  r2 = Geometry::Rect[p1, p2]
  lines = [r1, r2].map(&:sides).flatten
  lines << Geometry::Line[edge.inside.p1.plus(v1), edge.inside.p1.clone]
  lines << Geometry::Line[edge.inside.p2.plus(v2), edge.inside.p2.clone]
  lines
end

#add_corners_when_out(dim_index, direction, k) ⇒ Object 



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# File 'lib/laser-cutter/notching/path_generator.rb', line 140

def add_corners_when_out(dim_index, direction, k)
  v1 = direction * k * shift_vector(1, dim_index)
  v2 = direction * k * shift_vector(2, dim_index)
  p1 = edge.inside.p1.plus(v1)
  coords = []
  coords[d_index_along] = edge.outside.p1[d_index_along]
  coords[d_index_across] = edge.inside.p1[d_index_across]
  p2 = Geometry::Point[*coords]
  r1 = Geometry::Rect[p1, p2]

  p1 = edge.inside.p2.plus(v2)
  coords = []
  coords[d_index_along] = edge.outside.p2[d_index_along]
  coords[d_index_across] = edge.inside.p2[d_index_across]
  p2 = Geometry::Point[*coords]
  r2 = Geometry::Rect[p1, p2]
  lines = [r1, r2].map(&:sides).flatten
  lines << Geometry::Line[edge.inside.p1.plus(v1), edge.inside.p1.clone]
  lines << Geometry::Line[edge.inside.p2.plus(v2), edge.inside.p2.clone]
  lines
end

#adjust_for_kerf(vertices, direction) ⇒ Object 



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# File 'lib/laser-cutter/notching/path_generator.rb', line 79

def adjust_for_kerf(vertices, direction)
  if kerf?
    point = vertices.pop
    point = corners ? point.plus(2 * direction * shift_vector(1)) : point
    vertices << point
  end
end

#corner_box_sides ⇒ Object 



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# File 'lib/laser-cutter/notching/path_generator.rb', line 87

def corner_box_sides
  boxes = []
  extra_lines = []
  sides = []

  # These two boxes occupy the corners of the 3D box. They do not match
  # in width to our notches because they are usually merged with them.
  # It's just an aesthetic choice I guess.
  boxes << Geometry::Rect[edge.inside.p1.clone, edge.outside.p1.clone]
  boxes << Geometry::Rect[edge.inside.p2.clone, edge.outside.p2.clone]

  if kerf?
    if adjust_corners
      if first_notch_out?
        k = 2
        direction = -1
        dim_index = 1
        extra_lines << add_corners_when_out(dim_index, direction, k)
      else
        k = -2
        direction = 1
        dim_index = 0
        extra_lines << add_boxes_when_in(dim_index, direction, k)
      end
    end
  end
  sides = boxes.flatten.map(&:relocate!).map(&:sides)
  sides << extra_lines if !extra_lines.empty?
  sides.flatten
end

#d_index_across ⇒ Object 



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# File 'lib/laser-cutter/notching/path_generator.rb', line 179

def d_index_across
  (d_index_along + 1) % 2
end

#d_index_along ⇒ Object

0 = X, 1 = Y



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# File 'lib/laser-cutter/notching/path_generator.rb', line 175

def d_index_along
  (edge.inside.p1.x == edge.inside.p2.x) ? 1 : 0
end

#direction_across ⇒ Object 



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# File 'lib/laser-cutter/notching/path_generator.rb', line 187

def direction_across
  (edge.inside.p1.coords.[](d_index_across) < edge.outside.p1.coords.[](d_index_across)) ? 1 : -1
end

#direction_along ⇒ Object 



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# File 'lib/laser-cutter/notching/path_generator.rb', line 183

def direction_along
  (edge.inside.p1.coords.[](d_index_along) < edge.inside.p2.coords.[](d_index_along)) ? 1 : -1
end

#generate ⇒ Object

Calculates a notched path that flows between the outer edge of the box (outside_line) and inner (inside_line). Relative location of these lines also defines the direction and orientation of the box, and hence the notches.

We always want to create a symmetric path that has a notch in the middle (for center_out = true) or dip in the middle (center_out = false)



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# File 'lib/laser-cutter/notching/path_generator.rb', line 57

def generate
  shifts = define_shifts
  vertices = []
  lines = []

  if corners
    lines << corner_box_sides
  end

  point = starting_point

  vertices << point
  adjust_for_kerf(vertices,-1) if adjust_corners && !first_notch_out?
  shifts.each do |shift|
    point = shift.next_point_after point
    vertices << point
  end
  adjust_for_kerf(vertices, 1) if adjust_corners && !first_notch_out?
  lines << create_lines(vertices)
  lines.flatten
end

#shift_vector(index, dim_shift = 0) ⇒ Object 



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# File 'lib/laser-cutter/notching/path_generator.rb', line 162

def shift_vector(index, dim_shift = 0)
  shift = []
  shift[(d_index_across + dim_shift) % 2] = 0
  shift[(d_index_along + dim_shift) % 2] = kerf / 2.0 * edge.send("v#{index}".to_sym).[]((d_index_along + dim_shift) % 2)
  Vector.[](*shift)
end

#starting_point ⇒ Object 



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# File 'lib/laser-cutter/notching/path_generator.rb', line 170

def starting_point
  edge.inside.p1.clone # start
end