Class: Paperclip::Document::Processors::Sketcher

Inherits:
Paperclip::Document::Processor show all
Defined in:
lib/paperclip/document/processors/sketcher.rb

Overview

This processor extract first page as thumbnail

Instance Attribute Summary collapse

Attributes inherited from Paperclip::Document::Processor

#instance, #tmp_dir

Instance Method Summary collapse

Methods inherited from Paperclip::Document::Processor

#basename, #file_path

Constructor Details

#initialize(file, options = {}, attachment = nil) ⇒ Sketcher

Returns a new instance of Sketcher.



10
11
12
13
14
15
16
17
18
19
 
# File 'lib/paperclip/document/processors/sketcher.rb', line 10

def initialize(file, options = {}, attachment = nil)
  super(file, options, attachment)
  @format  = (options[:format] || :jpg).to_sym
  unless [:jpg, :png].include?(@format)
    raise Paperclip::Error, "Valid format must be specified"
  end
  unless @size = options[:size]
    @density = (options[:density] || 150).to_f
  end
end

Instance Attribute Details

#density ⇒ Object

Returns the value of attribute density.



8
9
10
 
# File 'lib/paperclip/document/processors/sketcher.rb', line 8

def density
  @density
end

#format ⇒ Object

Returns the value of attribute format.



8
9
10
 
# File 'lib/paperclip/document/processors/sketcher.rb', line 8

def format
  @format
end

Instance Method Details

#make ⇒ Object

Extract the page



22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
 
# File 'lib/paperclip/document/processors/sketcher.rb', line 22

def make
  destination_path = tmp_dir.to_s
  options = {:output => destination_path, :pages => [1], :format => [@format]}
  if @size
    options[:size] = @size
  elsif @density
    options[:density] = @density
  end
  begin
    Docsplit.extract_images(file_path.to_s, options)
  rescue
    raise Paperclip::Error, "There was an error extracting the first thumbnail from #{basename}"
  end
  return File.open(File.join(destination_path, basename + "_1.#{@format}"))
end