Class: ODFWriter::Image

Inherits:
Field
  • Object
show all
Defined in:
lib/odf_writer/image.rb

Overview

Image: replace images

Constant Summary collapse

IMAGE_DIR_NAME =

constants

"Pictures"

Constants inherited from Field

Field::DELIMITERS

Instance Attribute Summary

Attributes inherited from Field

#name

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Field

#field, #initialize, #value

Constructor Details

This class inherits a constructor from ODFWriter::Field

Class Method Details

.unique_image_names(doc) ⇒ Object

def



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# File 'lib/odf_writer/image.rb', line 90

def self.unique_image_names(doc)
  nodes   = doc.xpath("//draw:frame[@draw:name='#{@name}']")
  padding = Math.log10(nodes.length).to_i + 1 if nodes.present?
  nodes.each_with_index do |node, i|
    num = "%.#{padding}i" % i
    node.attribute('name').value = "IMAGE_#{num}_" + node.attribute('name').value
  end
end

Instance Method Details

#replace!(doc, manifest, template, item = nil) ⇒ Object

replace!



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# File 'lib/odf_writer/image.rb', line 45

def replace!(doc, manifest, template, item=nil )

  image_data = value(item)
  
  if image_data = is_image?(image_data) 
    
    # find placeholder image
    nodes = find_image_nodes( doc )
    return if nodes.blank?
    
    # find manifest
    man = manifest.xpath("//manifest:manifest") rescue nil
    return if man.blank?
    
    # each placeholder image
    nodes.each do |node|
    
      # create unique filename for image in .odt file
      path = ::File.join(IMAGE_DIR_NAME, "#{SecureRandom.hex(20).upcase}#{::File.extname(image_data[:filename])}")
      mime = Rack::Mime.mime_type(File.extname(image_data[:filename]))
      
      # set path and mime type of placeholder image
      node.attribute('href').value = path
      if node.attribute('mime-type').present?
        node.attribute('mime-type').value = mime
      else
        node.set_attribute('mime-type', mime)
      end
      
      # set width and height of placeholder image
      parent = node.parent
      if parent.name == "frame"
        width  = parent.attribute('width').value
        height = parent.attribute('height').value
        parent.attribute('height').value = recalc_height(:x => image_data[:width], :y => image_data[:height], :newx => width, :newy => height)
      end
      
      # add image to .odt file
      add_image_file( image_data[:bytes], path, mime, doc, man, template )
      
    end
  end
  
end