带回形针的水印 [英] watermark with paperclip

问题描述

根据这个例子(http://dimaspriyanto.com/2010/06/08/image-watermarking-with-paperclip/)，我尝试在我上传的每张图片上加水印(目前，我克制自己到大的).

according to this example (http://dimaspriyanto.com/2010/06/08/image-watermarking-with-paperclip/), I try to put a watermark on every picture I upload (for now, I restrain myself to the large one).

你猜怎么着?它不起作用！

And guess what? It doesn't work!

所以在我的图片模型中，我有

So in my picture model, I have

require 'paperclip_processors/watermark'
  has_attached_file :image,
                  :styles => {:medium => "300x300^", :thumb => "150x105^",
                      :large => {
                          :geometry => "460",
                          :watermark_path => ":rails_root/public/images/watermark.png"
                      }
                  },
                  :url => "/images/:style/:id_:style.:extension",
                  :path => ":rails_root/public/images/:style/:id_:style.:extension"

在/lib/paperclip_processors/watermark.rb 中，我有:

and in /lib/paperclip_processors/watermark.rb, I have:

module Paperclip
  class Watermark < Processor

    attr_accessor :current_geometry, :target_geometry, :format, :whiny, :convert_options, :watermark_path, :overlay, :position

    def initialize file, options = {}, attachment = nil
       super
       geometry          = options[:geometry]
       @file             = file
       @crop             = geometry[-1,1] == '#'
       @target_geometry  = Geometry.parse geometry
       @current_geometry = Geometry.from_file @file
       @convert_options  = options[:convert_options]
       @whiny            = options[:whiny].nil? ? true : options[:whiny]
       @format           = options[:format]
       @watermark_path   = options[:watermark_path]
       @position         = options[:position].nil? ? "SouthEast" : options[:position]
       @overlay          = options[:overlay].nil? ? true : false
       @current_format   = File.extname(@file.path)
       @basename         = File.basename(@file.path, @current_format)
     end

      def crop?
        @crop
      end

      def convert_options?
        not @convert_options.blank?
      end

      def make
        dst = Tempfile.new([@basename, @format].compact.join("."))
        dst.binmode

        if watermark_path
          command = "composite"
          params = "-gravity #{@position} #{watermark_path} #{fromfile} #{transformation_command} #{tofile(dst)}"
        else
          command = "convert"
          params = "#{fromfile} #{transformation_command} #{tofile(dst)}"
        end

        begin
          success = Paperclip.run(command, params)
        rescue PaperclipCommandLineError
          raise PaperclipError, "There was an error processing the watermark for #{@basename}" if @whiny
        end

        dst
      end

      def fromfile
        "\"#{ File.expand_path(@file.path) }[0]\""
      end

      def tofile(destination)
        "\"#{ File.expand_path(destination.path) }[0]\""
      end    

      def transformation_command
        scale, crop = @current_geometry.transformation_to(@target_geometry, crop?)
        trans = "-resize \"#{scale}\""
        trans << " -crop \"#{crop}\" +repage" if crop
        trans << " #{convert_options}" if convert_options?
        trans
      end

  end

end

水印在/public/images/中，它不会在此过程中崩溃，我的意思是上传的图片有各种尺寸，但大的是裸体，没有水印.

The watermark is in /public/images/ and it doesn't crash in the process, I mean the pictures are uploaded, in every size but the large one is nude, without the watermark.

有什么想法吗?

推荐答案

这是有效的预处理器(我使用它)https://gist.github.com/2499137

Here's the preprocessor that works (I use it) https://gist.github.com/2499137

以下是您模型的示例代码:

Here's sample code for you model:

has_attached_file :data,
                  :processors => [:watermark],
                  :url  => "/ckeditor_assets/pictures/:id/:style_:basename.:extension",
                  :path => ":rails_root/public/ckeditor_assets/pictures/:id/:style_:basename.:extension",
                  :styles => {
                    :thumb => '118x100#',
                    :content => {
                      :geometry => '700>',
                      :watermark_path => "#{Rails.root}/public/images/watermark.png",
                      :position => 'SouthWest'
                    },
                  }

这篇关于带回形针的水印的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！