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module Fleximage
module Operator
# Crops the image without doing any resizing first. The operation crops from the :+from+ coordinate,
# and returns an image of size :+size+ down and right from there.
#
# image.crop(options = {})
#
# Use the following keys in the +options+ hash:
#
# * +gravity+: Select gravity for the crop. Default is :top_left (Magick::NorthWestGravity)
# Choose from GRAVITITES constant defined in base.rb.
# * +from+: coorinates for the upper left corner of resulting image.
# * +size+: The size of the resulting image, going down and to the right of the :+from+ coordinate.
#
# size and from options are *required*.
#
# Example:
#
# @photo.operate do |image|
# image.crop(
# :from => '100x50',
# :size => '500x350'
# )
# end
#
# or
#
# @photo.operate do |image|
# image.crop(
# :gravity => :center,
# :from => '100x50',
# :size => '500x350'
# )
# end
class Crop < Operator::Base
def operate(options = {})
options = options.symbolize_keys
options.reverse_merge!(:gravity => :top_left)
# required integer keys
[:from, :size].each do |key|
raise ArgumentError, ":#{key} must be included in crop options" unless options[key]
options[key] = size_to_xy(options[key])
end
# width and height must not be zero
options[:size].each do |dimension|
raise ArgumentError, ":size must not be zero for X or Y" if dimension.zero?
end
# crop
@image.crop!(symbol_to_gravity(options[:gravity]), options[:from][0], options[:from][1], options[:size][0], options[:size][1], true)
end
end
end
end
Version data entries
14 entries across 14 versions & 4 rubygems