ruby-on-rails - 回形针：宽度为 100%，高度为宽度的 60%

Question

如何编写回形针样式以将上传图像的宽度保持在 100%，但仅将高度裁剪为宽度的 60%？

像这样的东西：

has_attached_file :image, :styles => { :cropped => "100%x[60% of height]" }

Answer 1

has_attached_file :image, :styles => after_save :save_image_dimensions

def save_image_dimensions
  geo = Paperclip::Geometry.from_file(image.path)
  self.image_height = (geo.height.to_i * 60)/100 
end

如果您在提取维度上遇到问题，请从下面获得很好的帮助

https://github.com/thoughtbot/paperclip/wiki/Extracting-image-dimensions

请查看此链接以使用回形针裁剪图像

http://viget.com/extend/manual-cropping-with-paperclip

谢谢

Answer 2

has_attached_file :image, :styles => { 
                      :original  => "100x60>",
                      :thumb => Proc.new { |instance| instance.resize }
                    }
  #### End Paperclip ####

  def resize     
     geo = Paperclip::Geometry.from_file(image.to_file(:original))
     height = (geo.width.to_i * 60)/100
     width = geo.width     
     "#{width.round}x#{height.round}!"    
  end  

希望这可以帮助你