Class: VisualisationUtils::GnuPlotTool

Inherits:
Object
  • Object
show all
Defined in:
lib/visualisation-utils.rb

Overview

Wraps the gnu plot invocation and basic scaffold for shared options around output format.

Instance Method Summary collapse

Constructor Details

#initialize(opts) ⇒ GnuPlotTool 



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# File 'lib/visualisation-utils.rb', line 22

def initialize(opts)
    @title = opts[:title] || ""
    @opts = opts
    @debug = opts[:debug]

    if (! system 'which gnuplot')
        STDERR.puts("This utility depends on gnuplot. Please install gnuplot using your favourite package manager.")
        exit(1)
    end

    font = @opts[:font] || "Helvetica"
    font_size = @opts[:font_size ] || "12"

    @extra_header = @opts[:extra_header] || ""

    dimensions=@opts[:dimensions] || "1200,800"

    if (@opts[:outfile])
        filename = @opts[:outfile]
        extension = filename.gsub(/[^.]*\./, "")
        if (extension == "png")
            @terminal="    set term pngcairo font '\#{font},\#{font_size}' \#{@opts[:transparent]?\"transparent\":\"\"} size \#{dimensions}\n    set output '\#{filename}'\n"
        elsif (extension == "eps")
            @terminal="    set term epscairo size \#{dimensions} font '\#{font},\#{font_size}'\n    set output '\#{filename}'\n"
        elsif (extension == "pdf")
            @terminal="    set term pdfcairo size 22cm,14cm font '\#{font},\#{font_size}'\n    set output '\#{filename}'\n"
        elsif (extension == "svg")
            @terminal="    set term svg size \#{dimensions} font '\#{font},\#{font_size}'\n    set output '\#{filename}'\n"
        else
            throw "Unknown output format '.#{extension}'."
        end
    end
end

Instance Method Details

#debug? ⇒ Boolean 



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# File 'lib/visualisation-utils.rb', line 68

def debug?
    @debug
end

#plot(script) ⇒ Object 



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# File 'lib/visualisation-utils.rb', line 72

def plot(script)
    plot_file_name="/tmp/plot-"+`date  "+%s"`.strip+".plt"
    full_script="\#{@terminal}\n        set title \"\#{@title}\"\n\n        \#{@extra_header}\n\n        \#{script}\n"

    if (debug?)
        STDERR.puts "plot file " + plot_file_name
    end

    File.open(plot_file_name, "w") { |f| f.write(full_script) }

    persistent_opt = @opts[:outfile] ? "" : "-p"

    `gnuplot #{persistent_opt} #{plot_file_name}`

end