Class: Webgen::Tag::TikZ

Inherits:
Object
  • Object
show all
Includes:
Base, WebsiteAccess
Defined in:
lib/webgen/tag/tikz.rb

Overview

This tag allows the creation and inclusion of complex graphics using the PGF/TikZ library of LaTeX. You will need a current LaTeX distribution and the convert utility from ImageMagick.

Constant Summary collapse

LATEX_TEMPLATE = 
<<EOF
\\nonstopmode \\documentclass{article} \\usepackage{tikz} \\pagestyle{empty}
<% if param('tag.tikz.libraries') %>
\\usetikzlibrary{<%= param('tag.tikz.libraries').join(',') %>}
<% end %>
\\begin{document}
<% if param('tag.tikz.opts') %>
\\begin{tikzpicture}[<%= param('tag.tikz.opts') %>]
<% else %>
\\begin{tikzpicture}
<% end %>
<%= body %>
\\end{tikzpicture}
\\end{document}
EOF

Instance Method Summary collapse

Methods included from WebsiteAccess

included, website

Methods included from Base

#create_tag_params, #param, #set_params

Methods included from Loggable

#log, #puts

Instance Method Details

#call(tag, body, context) ⇒ Object

Create a graphic from the commands in the body of the tag.



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# File 'lib/webgen/tag/tikz.rb', line 33

def call(tag, body, context)
  path = param('tag.tikz.path')
  path = Webgen::Common.absolute_path(path, context.ref_node.parent.absolute_lcn)

  mem_handler = website.cache.instance('Webgen::SourceHandler::Memory')
  src_path = context.ref_node.node_info[:src]
  parent = website.blackboard.invoke(:create_directories, context.ref_node.tree.root, File.dirname(path), src_path)
  params = @params

  node = website.blackboard.invoke(:create_nodes, parent.tree, parent.absolute_lcn,
                                   Webgen::Path.new(path, src_path), mem_handler) do |node_parent, node_path|
    mem_handler.create_node(node_parent, node_path, context.ref_node.absolute_lcn) do |pic_node|
      set_params(params)
      document = ERB.new(LATEX_TEMPLATE).result(binding)
      pic_path = compile(document, File.extname(path), context)
      set_params(nil)
      if pic_path
        io = Webgen::Path::SourceIO.new { File.open(pic_path, 'rb') }
      else
        pic_node.flag(:dirty)
        nil
      end
    end
  end.first
  attrs = param('tag.tikz.img_attr').collect {|name,value| "#{name.to_s}=\"#{value}\"" }.sort.unshift('').join(' ')
  "<img src=\"#{context.dest_node.route_to(node)}\"#{attrs} />"
end