Class: Dedalus::ViewTraversal

Inherits:
Object
  • Object
show all
Includes:
Geometer::DimensionHelpers, Geometer::PointHelpers
Defined in:
lib/dedalus/view_traversal.rb

Instance Method Summary collapse

Constructor Details

#initialize(&blk) ⇒ ViewTraversal

Returns a new instance of ViewTraversal.



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# File 'lib/dedalus/view_traversal.rb', line 6

def initialize(&blk)
  instance_eval(&blk)
end

Instance Method Details

#on_atom(&blk) ⇒ Object 



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# File 'lib/dedalus/view_traversal.rb', line 10

def on_atom(&blk)
  @atom_callback = blk
end

#on_element(&blk) ⇒ Object 



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# File 'lib/dedalus/view_traversal.rb', line 18

def on_element(&blk)
  @element_callback = blk
end

#on_molecule(&blk) ⇒ Object 



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# File 'lib/dedalus/view_traversal.rb', line 14

def on_molecule(&blk)
  @molecule_callback = blk
end

#walk!(structure, origin:, dimensions:, freeform: false) ⇒ Object 



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# File 'lib/dedalus/view_traversal.rb', line 22

def walk!(structure, origin:, dimensions:, freeform: false)
  width, height = *dimensions
  height = structure.height if !structure.is_a?(Array) && structure.height
  width = structure.width if !structure.is_a?(Array) && structure.width
  x0, y0 = *origin

  if structure.is_a?(Dedalus::Atom)
    @atom_callback.call(structure, origin: origin, dimensions: dimensions, freeform: freeform) if @atom_callback
  elsif structure.is_a?(Dedalus::Element)
    # an element *other than* an atom, we need to call #show on it
    margin = structure.margin || 0.0
    x,y = x0 + margin, y0 + margin
    margin_origin = [ x, y ]
    margin_dims = [ width - margin*2, height - margin*2 ]

    if structure.is_a?(Dedalus::Molecule) && @molecule_callback
      @molecule_callback.call(structure, origin: margin_origin, dimensions: margin_dims)
    end

    if @element_callback
      @element_callback.call(structure, origin: margin_origin, dimensions: margin_dims)
    end

    pad = structure.padding || 0.0
    pad_origin = [x+pad,y+pad]
    pad_dims = [width - pad*2 - margin*2, height - pad*2 - margin*2 ]

    if structure.is_a?(LayerStack)
      layers = structure.layers
      layers.each do |layer|
        walk!(layer, origin: pad_origin, dimensions: pad_dims, freeform: layer.freeform?)
      end
    else
      walk!(structure.show, origin: pad_origin, dimensions: pad_dims, freeform: freeform)
    end
  elsif structure.is_a?(Array) # we have a set of rows
    walk_rows!(structure, origin: origin, dimensions: dimensions)
  end
end