Class: Paperclip::Geometry

Inherits:
Object
  • Object
show all
Defined in:
lib/paperclip/geometry.rb

Overview

Defines the geometry of an image.

Constant Summary collapse

EXIF_ROTATED_ORIENTATION_VALUES = 
[5, 6, 7, 8]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(width = nil, height = nil, modifier = nil) ⇒ Geometry

Gives a Geometry representing the given height and width



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# File 'lib/paperclip/geometry.rb', line 10

def initialize(width = nil, height = nil, modifier = nil)
  if width.is_a?(Hash)
    options = width
    @height = options[:height].to_f
    @width = options[:width].to_f
    @modifier = options[:modifier]
    @orientation = options[:orientation].to_i
  else
    @height = height.to_f
    @width  = width.to_f
    @modifier = modifier
  end
end

Instance Attribute Details

#height ⇒ Object

Returns the value of attribute height.



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# File 'lib/paperclip/geometry.rb', line 5

def height
  @height
end

#modifier ⇒ Object

Returns the value of attribute modifier.



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# File 'lib/paperclip/geometry.rb', line 5

def modifier
  @modifier
end

#width ⇒ Object

Returns the value of attribute width.



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# File 'lib/paperclip/geometry.rb', line 5

def width
  @width
end

Class Method Details

.from_file(file) ⇒ Object

Extracts the Geometry from a file (or path to a file)



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# File 'lib/paperclip/geometry.rb', line 25

def self.from_file(file)
  GeometryDetector.new(file).make
end

.parse(string) ⇒ Object

Extracts the Geometry from a “WxH,O” string Where W is the width, H is the height, and O is the EXIF orientation



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# File 'lib/paperclip/geometry.rb', line 32

def self.parse(string)
  GeometryParser.new(string).make
end

Instance Method Details

#aspect ⇒ Object

The aspect ratio of the dimensions.



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# File 'lib/paperclip/geometry.rb', line 60

def aspect
  width / height
end

#auto_orient ⇒ Object

Swaps the height and width if necessary



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# File 'lib/paperclip/geometry.rb', line 37

def auto_orient
  if EXIF_ROTATED_ORIENTATION_VALUES.include?(@orientation)
    @height, @width = @width, @height
    @orientation -= 4
  end
end

#horizontal? ⇒ Boolean

True if the dimensions represent a horizontal rectangle

Returns:

  • (Boolean) 


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# File 'lib/paperclip/geometry.rb', line 50

def horizontal?
  height < width
end

#inspect ⇒ Object

Same as to_s



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# File 'lib/paperclip/geometry.rb', line 84

def inspect
  to_s
end

#larger ⇒ Object

Returns the larger of the two dimensions



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# File 'lib/paperclip/geometry.rb', line 65

def larger
  [height, width].max
end

#resize_to(geometry) ⇒ Object

resize to a new geometry

Examples:

Paperclip::Geometry.new(150, 150).resize_to('50x50!')
#=> Paperclip::Geometry(50, 50)

Parameters:

  • geometry (String) —

    the Paperclip geometry definition to resize to



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# File 'lib/paperclip/geometry.rb', line 112

def resize_to(geometry)
  new_geometry = Paperclip::Geometry.parse geometry
  case new_geometry.modifier
  when '!', '#'
    new_geometry
  when '>'
    if new_geometry.width >= self.width && new_geometry.height >= self.height
      self
    else
      scale_to new_geometry
    end
  when '<'
    if new_geometry.width <= self.width || new_geometry.height <= self.height
      self
    else
      scale_to new_geometry
    end
  else
    scale_to new_geometry
  end
end

#smaller ⇒ Object

Returns the smaller of the two dimensions



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# File 'lib/paperclip/geometry.rb', line 70

def smaller
  [height, width].min
end

#square? ⇒ Boolean

True if the dimensions represent a square

Returns:

  • (Boolean) 


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# File 'lib/paperclip/geometry.rb', line 45

def square?
  height == width
end

#to_s ⇒ Object

Returns the width and height in a format suitable to be passed to Geometry.parse



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# File 'lib/paperclip/geometry.rb', line 75

def to_s
  s = ""
  s << width.to_i.to_s if width > 0
  s << "x#{height.to_i}" if height > 0
  s << modifier.to_s
  s
end

#transformation_to(dst, crop = false) ⇒ Object

Returns the scaling and cropping geometries (in string-based ImageMagick format) neccessary to transform this Geometry into the Geometry given. If crop is true, then it is assumed the destination Geometry will be the exact final resolution. In this case, the source Geometry is scaled so that an image containing the destination Geometry would be completely filled by the source image, and any overhanging image would be cropped. Useful for square thumbnail images. The cropping is weighted at the center of the Geometry.



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# File 'lib/paperclip/geometry.rb', line 95

def transformation_to dst, crop = false
  if crop
    ratio = Geometry.new( dst.width / self.width, dst.height / self.height )
    scale_geometry, scale = scaling(dst, ratio)
    crop_geometry         = cropping(dst, ratio, scale)
  else
    scale_geometry        = dst.to_s
  end

  [ scale_geometry, crop_geometry ]
end

#vertical? ⇒ Boolean

True if the dimensions represent a vertical rectangle

Returns:

  • (Boolean) 


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# File 'lib/paperclip/geometry.rb', line 55

def vertical?
  height > width
end