Class: TaskJuggler::Painter::Group

Inherits:
Object
  • Object
show all
Includes:
Primitives, SVGSupport
Defined in:
lib/taskjuggler/Painter/Group.rb

Overview

The Group can be used to group Elements together and define common attributes in a single place.

Constant Summary

Constants included from Primitives

Primitives::FillAndStrokeAttrs, Primitives::FillAttrs, Primitives::StrokeAttrs, Primitives::TextAttrs

Instance Method Summary collapse

Methods included from SVGSupport

#valuesToSVG

Methods included from Primitives

#circle, #color, #ellipse, #group, #line, #points, #polyline, #rect, #text

Constructor Details

#initialize(values, &block) ⇒ Group

Returns a new instance of Group.



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# File 'lib/taskjuggler/Painter/Group.rb', line 28

def initialize(values, &block)
  @attributes = [
    :fill, :font_family, :font_size, :stroke, :stroke_width
  ]
  values.each do |k, v|
    unless @attributes.include?(k)
      raise ArgumentError, "Unsupported attribute #{k}. " +
                           "Use one of #{@attributes.join(', ')}."
    end
  end

  @values = values
  @elements = []

  if block
    if block.arity == 1
      # This is the traditional case where self is passed to the block.
      # All Primitives methods now must be prefixed with the block
      # variable to call them.
      yield self
    else
      # In order to have the primitives easily available in the block,
      # we use instance_eval to switch self to this object. But this
      # makes the methods of the original self no longer accessible. We
      # work around this by saving the original self and using
      # method_missing to delegate the method call to the original self.
      @originalSelf = eval('self', block.binding)
      instance_eval(&block)
    end
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object

Delegator to @originalSelf.



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# File 'lib/taskjuggler/Painter/Group.rb', line 61

def method_missing(method, *args, &block)
  @originalSelf.send(method, *args, &block)
end

Instance Method Details

#to_svg ⇒ Object

Convert the Group into an XMLElement tree using SVG syntax.



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# File 'lib/taskjuggler/Painter/Group.rb', line 66

def to_svg
  XMLElement.new('g', valuesToSVG) do
    @elements.map { |el| el.to_svg }
  end
end