class Prawn::SVG::Calculators::AspectRatio

Attributes

align[R]
defer[R]
height[R]
width[R]
x[R]
y[R]

Public Class Methods

new(value, container_dimensions, object_dimensions) click to toggle source
# 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

Public Instance Methods

inspect() click to toggle source
# File lib/prawn/svg/calculators/aspect_ratio.rb, line 56
def inspect
  "[AspectRatio: #{@width},#{@height} offset #{@x},#{@y}]"
end
meet?() click to toggle source
# File lib/prawn/svg/calculators/aspect_ratio.rb, line 52
def meet?
  @meet_or_slice != 'slice'
end
slice?() click to toggle source
# File lib/prawn/svg/calculators/aspect_ratio.rb, line 48
def slice?
  @meet_or_slice == 'slice'
end