Class: Prawn::SVG::Calculators::AspectRatio

Inherits:
Object
  • Object
show all
Defined in:
lib/prawn/svg/calculators/aspect_ratio.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(value, container_dimensions, object_dimensions) ⇒ AspectRatio

Returns a new instance of AspectRatio.



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# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 6

def initialize(value, container_dimensions, object_dimensions)
  values = (value || 'xMidYMid meet').split
  @x = @y = 0

  if values.first == 'defer'
    @defer = true
    values.shift
  end

  @align, @meet_or_slice = values

  w_container, h_container = container_dimensions
  w_object,    h_object    = object_dimensions

  container_ratio = w_container / h_container.to_f
  object_ratio    = w_object / h_object.to_f

  if @align == 'none'
    @width, @height = container_dimensions
  else
    matches = @align.to_s.strip.match(/\Ax(Min|Mid|Max)Y(Min|Mid|Max)\z/i) || [nil, 'Mid', 'Mid']

    if (container_ratio > object_ratio) == slice?
      @width = w_container
      @height = w_container / object_ratio
      @y = case matches[2].downcase
           when 'min' then 0
           when 'mid' then (h_container - (w_container / object_ratio)) / 2
           when 'max' then h_container - (w_container / object_ratio)
           end
    else
      @width = h_container * object_ratio
      @height = h_container
      @x = case matches[1].downcase
           when 'min' then 0
           when 'mid' then (w_container - (h_container * object_ratio)) / 2
           when 'max' then w_container - (h_container * object_ratio)
           end
    end
  end
end

Instance Attribute Details

#align ⇒ Object (readonly)

Returns the value of attribute align.



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# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 3

def align
  @align
end

#defer ⇒ Object (readonly)

Returns the value of attribute defer.



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# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 3

def defer
  @defer
end

#height ⇒ Object (readonly)

Returns the value of attribute height.



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# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 4

def height
  @height
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 4

def width
  @width
end

#x ⇒ Object (readonly)

Returns the value of attribute x.



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# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 4

def x
  @x
end

#y ⇒ Object (readonly)

Returns the value of attribute y.



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# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 4

def y
  @y
end

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 56

def inspect
  "[AspectRatio: #{@width},#{@height} offset #{@x},#{@y}]"
end

#meet? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 52

def meet?
  @meet_or_slice != 'slice'
end

#slice? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 48

def slice?
  @meet_or_slice == 'slice'
end