Class: Refinery::ThumbnailDimensions

Inherits:
Object
  • Object
show all
Defined in:
app/models/refinery/thumbnail_dimensions.rb

Defined Under Namespace

Classes: Geometry

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(geometry, original_width, original_height) ⇒ ThumbnailDimensions

Returns a new instance of ThumbnailDimensions.



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 6

def initialize(geometry, original_width, original_height)
  @geometry = Geometry.new(geometry)

  @original_width = original_width.to_f
  @original_height = original_height.to_f

  process
end

Instance Attribute Details

#geometry ⇒ Object

Returns the value of attribute geometry.



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 4

def geometry
  @geometry
end

#height ⇒ Object

Returns the value of attribute height.



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 4

def height
  @height
end

#original_height ⇒ Object

Returns the value of attribute original_height.



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 4

def original_height
  @original_height
end

#original_width ⇒ Object

Returns the value of attribute original_width.



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 4

def original_width
  @original_width
end

#width ⇒ Object

Returns the value of attribute width.



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 4

def width
  @width
end

Instance Method Details

#crop ⇒ Object 



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 45

def crop
  @width = geometry.width
  @height = geometry.height
end

#original_dimensions ⇒ Object 



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 40

def original_dimensions
  @width = original_width
  @height = original_height
end

#process ⇒ Object 



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 15

def process
  if valid_geometry && resize_geometry && resize_necessary
    scale
  elsif valid_geometry && !resize_geometry
    crop
  else
    original_dimensions
  end
end

#resize_geometry ⇒ Object 



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 29

def resize_geometry
  ::Dragonfly::ImageMagick::Processors::Thumb::RESIZE_GEOMETRY === geometry.geometry
end

#resize_necessary ⇒ Object 



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 33

def resize_necessary
  !geometry.custom? ||
      (geometry.custom? &&
        (original_width > geometry.width ||
          original_height > geometry.height))
end

#scale ⇒ Object 



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 50

def scale
  # Try scaling with width factor first. (wf = width factor)
  wf_width = geometry.width.round
  wf_height = (original_height * geometry.width / original_width).round

  # Scale with height factor (hf = height factor)
  hf_width = (original_width * geometry.height / original_height).round
  hf_height = geometry.height.round

  # Take the highest value that doesn't exceed either axis limit.
  use_wf = wf_width > 0 && wf_width <= geometry.width && wf_height <= geometry.height
  if use_wf && hf_width <= geometry.width && hf_height <= geometry.height
    use_wf = wf_width * wf_height > hf_width * hf_height
  end

  if use_wf
    @width = wf_width
    @height = wf_height
  else
    @width = hf_width
    @height = hf_height
  end
end

#thumb_geometry ⇒ Object 



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 74

def thumb_geometry
  Regexp.union(::Dragonfly::ImageMagick::Processors::Thumb::RESIZE_GEOMETRY,
               ::Dragonfly::ImageMagick::Processors::Thumb::CROPPED_RESIZE_GEOMETRY,
               ::Dragonfly::ImageMagick::Processors::Thumb::CROP_GEOMETRY)
end

#valid_geometry ⇒ Object 



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# File 'app/models/refinery/thumbnail_dimensions.rb', line 25

def valid_geometry
  (original_width * original_height > 0) && thumb_geometry === geometry.geometry
end