Class: Ea::Svg::StyleResolver

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

Overview

Translates the parsed style hash (from Ea::Sources::Qea::DiagramStyleParser, or the equivalent for XMI) into SVG-friendly attributes. EA packs colors as integers (e.g. 16777215 = white); we translate to CSS hex.

Constant Summary collapse

DEFAULT_FILL = 
"#ffffff"
DEFAULT_STROKE = 
"#000000"
DEFAULT_FONT_COLOR = 
"#000000"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(style_hash) ⇒ StyleResolver

Returns a new instance of StyleResolver.



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# File 'lib/ea/svg/style_resolver.rb', line 16

def initialize(style_hash)
  @style = style_hash || {}
end

Instance Attribute Details

#style ⇒ Object (readonly)

Returns the value of attribute style.



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# File 'lib/ea/svg/style_resolver.rb', line 14

def style
  @style
end

Instance Method Details

#color_from_ea(raw) ⇒ Object

EA stores colors as decimal integers in BGR byte order (low byte = red, high byte = blue). The high byte may hold alpha in some variants; we treat anything above 0xFFFFFF as opaque.



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# File 'lib/ea/svg/style_resolver.rb', line 53

def color_from_ea(raw)
  return nil if raw.nil? || raw.to_s.empty?

  # Hex strings (e.g. from XMI): passthrough.
  return "##{raw}" if raw.to_s.match?(/\A[0-9a-fA-F]{6}\z/)

  Integer(raw.to_s)
rescue ArgumentError
  nil
else
  # Convert BGR integer → RGB hex.
  value = Integer(raw)
  b = (value >> 16) & 0xff
  g = (value >> 8) & 0xff
  r = value & 0xff
  format("#%02X%02X%02X", r, g, b)
end

#fill_color ⇒ Object 



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# File 'lib/ea/svg/style_resolver.rb', line 20

def fill_color
  color_from_ea(style[:bcol]) || DEFAULT_FILL
end

#font_color ⇒ Object 



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# File 'lib/ea/svg/style_resolver.rb', line 28

def font_color
  color_from_ea(style[:fcol]) || DEFAULT_FONT_COLOR
end

#stroke_color ⇒ Object 



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# File 'lib/ea/svg/style_resolver.rb', line 24

def stroke_color
  color_from_ea(style[:lcol]) || DEFAULT_STROKE
end

#stroke_width ⇒ Object 



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# File 'lib/ea/svg/style_resolver.rb', line 32

def stroke_width
  raw = style[:lwd]
  return 1 if raw.nil? || raw.to_s.empty?

  Integer(raw)
rescue ArgumentError
  1
end

#to_svg_attrs ⇒ Object 



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# File 'lib/ea/svg/style_resolver.rb', line 41

def to_svg_attrs
  {
    fill: fill_color,
    stroke: stroke_color,
    "stroke-width": stroke_width
  }
end