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, render: false, z_index: ZOrder::Background) ⇒ Object 



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

def walk!(structure, origin:, dimensions:, freeform: false, render: false, z_index: ZOrder::Background)
  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, z_index: z_index) if @atom_callback

  # implicitly array is rows, nested arrays are columns, doubly-nested arrays are rows, etc
  elsif structure.is_a?(Array)
    walk_rows!(structure, origin: origin, dimensions: dimensions, render: render)

  elsif structure.is_a?(Dedalus::Element)
    offset = structure.offset || [0,0]
    ox,oy = *offset

    # an element *other than* an atom, we need to call #show on it
    margin = structure.margin || 0.0
    x,y = x0 + ox + margin, y0 + oy + 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, z_index: z_index)
    end

    if @element_callback
      @element_callback.call(structure, origin: margin_origin, dimensions: margin_dims, z_index: z_index)
    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)
      structure.layers.each do |layer|
        if layer.freeform?
          if layer.shown.is_a?(Array)
            layer.elements.each_with_index do |layer_element, z_offset|
              walk!(layer_element, origin: pad_origin, dimensions: pad_dims, freeform: true, render: render, z_index: z_index+z_offset)
            end
          else
            walk!(layer.elements, origin: pad_origin, dimensions: pad_dims, freeform: true, render: render, z_index: z_index)
          end
        else
          walk!(layer.elements, origin: pad_origin, dimensions: pad_dims, freeform: false, render: render, z_index: z_index)
        end
      end
    else
      if structure.record? && render
        recorded_image = ImageRepository.lookup_recording(structure.name, structure.width, structure.height, structure.window, force: structure.rerecord?) do
          walk!(structure.shown, origin: [0,0], dimensions: pad_dims, freeform: freeform, render: render)
        end

        ox,oy = *pad_origin
        recorded_image.draw(ox,oy,z_index)
      else
        walk!(structure.shown, origin: pad_origin, dimensions: pad_dims, freeform: freeform, render: render, z_index: z_index)
      end
    end
  end
rescue => ex
  puts "ERROR: Encountered an error with structure of type #{structure.class.name}"
  p ex.message
  p ex.backtrace
  raise ex
end