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


6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 6

def initialize(value, container_dimensions, object_dimensions)
  values = (value || "xMidYMid meet").strip.split(/\s+/)
  @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, @height = [w_container, 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, @height = [h_container * object_ratio, 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

#alignObject (readonly)

Returns the value of attribute align


3
4
5
# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 3

def align
  @align
end

#deferObject (readonly)

Returns the value of attribute defer


3
4
5
# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 3

def defer
  @defer
end

#heightObject (readonly)

Returns the value of attribute height


4
5
6
# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 4

def height
  @height
end

#widthObject (readonly)

Returns the value of attribute width


4
5
6
# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 4

def width
  @width
end

#xObject (readonly)

Returns the value of attribute x


4
5
6
# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 4

def x
  @x
end

#yObject (readonly)

Returns the value of attribute y


4
5
6
# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 4

def y
  @y
end

Instance Method Details

#inspectObject


54
55
56
# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 54

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

#meet?Boolean

Returns:

  • (Boolean)

50
51
52
# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 50

def meet?
  @meet_or_slice != "slice"
end

#slice?Boolean

Returns:

  • (Boolean)

46
47
48
# File 'lib/prawn/svg/calculators/aspect_ratio.rb', line 46

def slice?
  @meet_or_slice == "slice"
end