Class: Ea::Svg::EaEmitter::Markers

Inherits:
Object
  • Object
show all
Defined in:
lib/ea/svg/ea_emitter/markers.rb

Overview

Emits marker <polygon> and <path> elements per connector, matching EA's encoding rules. Returns an Array of Layer structs bucketed by marker style.

Layer style keys:

- :diamond_filled  → 4-pt <polygon>, black fill
- :triangle_open   → 3-pt <polygon>, white fill
- :arrow           → 3-pt <path>, no fill (shares style with
connector lines — same stroke, no fill)

Default mode (grouped: true) consolidates all markers of the same style into ONE <g>. Pass grouped: false for per-connector grouping.

Defined Under Namespace

Classes: Entry

Constant Summary collapse

DIAMOND_HALF_W = 
5
DIAMOND_HALF_H = 
10
TRI_HALF_BASE = 
6
TRI_HEIGHT = 
11
ARROW_HALF_BASE = 
6
ARROW_HEIGHT = 
11

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(diagram, model_index:, canvas: nil, grouped: true, stroke_width: 2) ⇒ Markers

Returns a new instance of Markers.



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# File 'lib/ea/svg/ea_emitter/markers.rb', line 29

def initialize(diagram, model_index:, canvas: nil, grouped: true, stroke_width: 2)
  @diagram = diagram
  @model_index = model_index
  @canvas = canvas
  @grouped = grouped
  @stroke_width = stroke_width
end

Instance Attribute Details

#canvas ⇒ Object (readonly)

Returns the value of attribute canvas.



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# File 'lib/ea/svg/ea_emitter/markers.rb', line 27

def canvas
  @canvas
end

#diagram ⇒ Object (readonly)

Returns the value of attribute diagram.



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# File 'lib/ea/svg/ea_emitter/markers.rb', line 27

def diagram
  @diagram
end

#grouped ⇒ Object (readonly)

Returns the value of attribute grouped.



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# File 'lib/ea/svg/ea_emitter/markers.rb', line 27

def grouped
  @grouped
end

#model_index ⇒ Object (readonly)

Returns the value of attribute model_index.



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# File 'lib/ea/svg/ea_emitter/markers.rb', line 27

def model_index
  @model_index
end

#stroke_width ⇒ Object (readonly)

Returns the value of attribute stroke_width.



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# File 'lib/ea/svg/ea_emitter/markers.rb', line 27

def stroke_width
  @stroke_width
end

Instance Method Details

#count_for(connector) ⇒ Object

Backwards-compatible API: count of marker bodies emitted.



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# File 'lib/ea/svg/ea_emitter/markers.rb', line 63

def count_for(connector)
  return 0 if connector.hidden
  return 0 unless connector.waypoints&.any? { |w| w.position }

  entries_for(connector).size
end

#layers ⇒ Object 



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# File 'lib/ea/svg/ea_emitter/markers.rb', line 37

def layers
  entries = visible_connectors.flat_map { |c| entries_for(c) }
  return [] if entries.empty?

  if grouped
    entries.group_by(&:style_key).map do |key, grouped_entries|
      # EA emits ONE marker per connector regardless of
      # anchor overlap. Verified against plateau Bridge
      # diagram: 9 generalizations fanning from the same
      # parent anchor produce 9 distinct triangle polygons
      # at the same coordinates. The earlier "dedup by
      # anchor" hypothesis is disproven by reference SVGs.
      Layer.new(style_key: key,
                style: style_for(key),
                body: grouped_entries.map(&:body).join("\n  "))
    end
  else
    entries.map { |e| Layer.new(style_key: e.style_key, style: style_for(e.style_key), body: e.body) }
  end
end

#render ⇒ Object 



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# File 'lib/ea/svg/ea_emitter/markers.rb', line 58

def render
  layers.map(&:to_svg).join("\n")
end