Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
159 lines (137 sloc) 4.597 kb
module Paperclip
# Defines the geometry of an image.
class Geometry
attr_accessor :height, :width, :modifier
EXIF_ROTATED_ORIENTATION_VALUES = [5, 6, 7, 8]
# Gives a Geometry representing the given height and width
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
# Extracts the Geometry from a file (or path to a file)
def self.from_file(file)
GeometryDetector.new(file).make
end
# Extracts the Geometry from a "WxH,O" string
# Where W is the width, H is the height,
# and O is the EXIF orientation
def self.parse(string)
GeometryParser.new(string).make
end
# Swaps the height and width if necessary
def auto_orient
if EXIF_ROTATED_ORIENTATION_VALUES.include?(@orientation)
@height, @width = @width, @height
@orientation -= 4
end
end
# True if the dimensions represent a square
def square?
height == width
end
# True if the dimensions represent a horizontal rectangle
def horizontal?
height < width
end
# True if the dimensions represent a vertical rectangle
def vertical?
height > width
end
# The aspect ratio of the dimensions.
def aspect
width / height
end
# Returns the larger of the two dimensions
def larger
[height, width].max
end
# Returns the smaller of the two dimensions
def smaller
[height, width].min
end
# Returns the width and height in a format suitable to be passed to Geometry.parse
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
# Same as to_s
def inspect
to_s
end
# 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.
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
# resize to a new geometry
# @param geometry [String] the Paperclip geometry definition to resize to
# @example
# Paperclip::Geometry.new(150, 150).resize_to('50x50!')
# #=> Paperclip::Geometry(50, 50)
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
private
def scaling dst, ratio
if ratio.horizontal? || ratio.square?
[ "%dx" % dst.width, ratio.width ]
else
[ "x%d" % dst.height, ratio.height ]
end
end
def cropping dst, ratio, scale
if ratio.horizontal? || ratio.square?
"%dx%d+%d+%d" % [ dst.width, dst.height, 0, (self.height * scale - dst.height) / 2 ]
else
"%dx%d+%d+%d" % [ dst.width, dst.height, (self.width * scale - dst.width) / 2, 0 ]
end
end
# scale to the requested geometry and preserve the aspect ratio
def scale_to(new_geometry)
scale = [new_geometry.width.to_f / self.width.to_f , new_geometry.height.to_f / self.height.to_f].min
Paperclip::Geometry.new((self.width * scale).round, (self.height * scale).round)
end
end
end
Jump to Line
Something went wrong with that request. Please try again.