Module: Alchemy::Picture::Transformations

Extended by:
ActiveSupport::Concern
Included in:
Alchemy::PictureVariant
Defined in:
app/models/alchemy/picture/transformations.rb

Overview

This concern can extend classes that expose image_file, image_file_width and image_file_height. It provides methods for cropping and resizing.

Instance Method Summary collapse

Instance Method Details

#crop(size, crop_from = nil, crop_size = nil, upsample = false) ⇒ Object

Returns the rendered cropped image. Tries to use the crop_from and crop_size parameters. When they can’t be parsed, it just crops from the center.



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# File 'app/models/alchemy/picture/transformations.rb', line 17

def crop(size, crop_from = nil, crop_size = nil, upsample = false)
  raise "No size given!" if size.empty?

  render_to = inferred_sizes_from_string(size)
  if crop_from && crop_size
    top_left = point_from_string(crop_from)
    crop_dimensions = inferred_sizes_from_string(crop_size)
    xy_crop_resize(render_to, top_left, crop_dimensions, upsample)
  else
    center_crop(render_to, upsample)
  end
end

#crop_size? ⇒ Boolean

Returns true if the class we’re included in has a meaningful crop_size attribute

Returns:

  • (Boolean) 


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# File 'app/models/alchemy/picture/transformations.rb', line 44

def crop_size?
  respond_to?(:crop_size) && !crop_size.nil? && !crop_size.empty?
end

#render_size? ⇒ Boolean

Returns true if the class we’re included in has a meaningful render_size attribute

Returns:

  • (Boolean) 


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# File 'app/models/alchemy/picture/transformations.rb', line 38

def render_size?
  respond_to?(:render_size) && render_size.present?
end

#resize(size, upsample = false) ⇒ Object

Returns the rendered resized image using imagemagick directly.



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# File 'app/models/alchemy/picture/transformations.rb', line 32

def resize(size, upsample = false)
  image_file.thumbnail(upsample ? size : "#{size}>")
end