module AttachmentSaver::Processors::Image::Operations
Public Instance Methods
scales the image proportionately to fit over the given width and height (as for scale_to_cover
), then crops the image to the given width & height. yields this image itself if it is already the appropriate size.
# File lib/processors/image.rb, line 207 def cover_and_crop(new_width, new_height, &block) scale_to_cover(new_width, new_height) do |scaled| return block.call(scaled) if new_width == scaled.width && new_height == scaled.height scaled.crop_to(new_width || width, new_height || height, &block) end end
keeps proportions, as for scale_to_fit
, but only ever makes images bigger. yields this image itself if it is already within the given dimensions or if the scaled dimensions would be smaller than the current dimensions. this is one of the operations specified by the *magick geometry strings, but IMHO it's not particularly useful as it doesn't establish any particularly helpful postconditions; consider whether scale_to_cover
would be more appropriate.
# File lib/processors/image.rb, line 182 def expand_to_fit(new_width, new_height, &block) new_width, new_height = scale_dimensions_to_fit(new_width, new_height) return block.call(self) if new_width <= width && new_height <= height squish(new_width, new_height, &block) end
scales the image by the given factors.
# File lib/processors/image.rb, line 145 def scale_by(width_factor, height_factor, &block) squish(width*width_factor, height*height_factor, &block) end
calculates the appropriate dimensions for scale_to_fit.
# File lib/processors/image.rb, line 150 def scale_dimensions_to_fit(new_width, new_height) raise ArgumentError, "must supply the width and/or height" if new_width.nil? && new_height.nil? if new_height.nil? || (!new_width.nil? && height*new_width < width*new_height) return [new_width, height*new_width/width] else return [width*new_height/height, new_height] end end
scales the image proportionately so that it fits over the given width and height (ie. one dimension will be equal to the given dimension, and the other dimension will be larger than the given other dimension). either (but not both) of the new width & height may be nil, in which case the image will be scaled solely based on the other parameter (in this case the result is the same as using scale_to_fit
). yields this image itself if it is already the appropriate size.
# File lib/processors/image.rb, line 194 def scale_to_cover(new_width, new_height, &block) raise ArgumentError, "must supply the width and/or height" if new_width.nil? && new_height.nil? if new_height.nil? || (!new_width.nil? && height*new_width > width*new_height) squish(new_width, height*new_width/width, &block) else squish(width*new_height/height, new_height, &block) end end
scales the image proportionately so that it fits within the given width and height (ie. one dimension will be equal to the given dimension, and the other dimension will be smaller than the given other dimension). either (but not both) of the new width & height may be nil, in which case the image will be scaled solely based on the other parameter. yields this image itself if it is already the appropriate size.
# File lib/processors/image.rb, line 164 def scale_to_fit(new_width, new_height, &block) squish(*scale_dimensions_to_fit(new_width, new_height), &block) end
keeps proportions, as for scale_to_fit
, but only ever makes images smaller. yields this image itself if it is already within the given dimensions.
# File lib/processors/image.rb, line 170 def shrink_to_fit(new_width, new_height, &block) new_width, new_height = scale_dimensions_to_fit(new_width, new_height) return block.call(self) if new_width >= width && new_height >= height squish(new_width, new_height, &block) end
squishes the image to the given width and height, without preserving the aspect ratio. yields this image itself if it is already the given size.
# File lib/processors/image.rb, line 139 def squish(new_width, new_height, &block) return block.call(self) if new_width == width && new_height == height resize_to(new_width.to_i, new_height.to_i, &block) end