Class: Ea::Svg::Renderer

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

Overview

Renders an Ea::Model::Diagram into a standalone SVG string. Coordinates come straight from the umldi (UML Diagram Interchange) content captured by the source adapter: DiagramElement bounds and DiagramConnector waypoints.

The renderer walks the diagram once, computes the union bounding box, and emits SVG in the same coordinate space (no y-flip; SVG's +y is down, same as EA's pixel space).

Constant Summary collapse

DEFAULT_PADDING = 
20

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(diagram, model_index: {}, padding: DEFAULT_PADDING) ⇒ Renderer

Returns a new instance of Renderer.



20
21
22
23
24
 
# File 'lib/ea/svg/renderer.rb', line 20

def initialize(diagram, model_index: {}, padding: DEFAULT_PADDING)
  @diagram = diagram
  @model_index = model_index
  @options = { padding: padding }
end

Instance Attribute Details

#diagram ⇒ Object (readonly)

Returns the value of attribute diagram.



18
19
20
 
# File 'lib/ea/svg/renderer.rb', line 18

def diagram
  @diagram
end

#model_index ⇒ Object (readonly)

Returns the value of attribute model_index.



18
19
20
 
# File 'lib/ea/svg/renderer.rb', line 18

def model_index
  @model_index
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



18
19
20
 
# File 'lib/ea/svg/renderer.rb', line 18

def options
  @options
end

Instance Method Details

#render ⇒ Object 



26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
 
# File 'lib/ea/svg/renderer.rb', line 26

def render
  bounds = BoundsCalculator.new(diagram).compute
  padded = pad(bounds)

  <<~SVG
    <?xml version="1.0" encoding="UTF-8"?>
    <svg xmlns="http://www.w3.org/2000/svg"
         viewBox="#{padded.x} #{padded.y} #{padded.width} #{padded.height}"
         width="#{padded.width}" height="#{padded.height}"
         font-family="sans-serif">
      <rect x="#{padded.x}" y="#{padded.y}"
            width="#{padded.width}" height="#{padded.height}"
            fill="white"/>
      #{render_elements}
      #{render_connectors}
    </svg>
  SVG
end