How to create a multi-page PDF-file with Gnuplot?
I make a dozen of plots with Gnuplot on Mac via ruby-gnuplot. If I re-run my ruby script, then the number of open windows with the plots doubles. If I could just output all these plots in a PDF opened in Preview, then the file would be automatically updated after every re-run and I don't need to bother closing the numerous windows.
Currently I can achieve this only with one plot per PDF-file开发者_JAVA技巧:
Gnuplot.open do |gp|
Gnuplot::Plot.new(gp) do |plot|
plot.arbitrary_lines << "set terminal pdf \n set output 'figures.pdf'"
# ...
end
end
How can I make a single PDF with all my figures by Gnuplot?
Hmm, at least on gnuplot for UN*x, multipage output for postscript and PDF always was the default - as long as you don't either change the terminal type nor reassign the output file, everything you plot ends up on a new page.
I.e. you do:
set terminal pdf
set output "multipageplot.pdf"
plot x, x*x
plot sin(x), cos(x)
set output ""
and you end up with two pages in the PDF file, one containing line/parabola, the other sine/cosine.
To clarify: The important thing is to issue all the plot
commands in sequence, without changing the output file nor changing the terminal type. Gnuplot won't append to an existing PDF file.
I make thousands of plots with ruby-gnuplot and use a gem called prawn to compile them into a pdf. The following is a code snippet using prawn, that includes some useful features:
require 'prawn'
def create_pdf
toy_catalogue = @toy_catalogue
full_output_filename ||= "#{output_path}/#{pre-specified_filename_string}"
Prawn::Document.generate(full_output_filename, :page_layout => :portrait, :margin => 5, :skip_page_creation => false, :page_size => [595, 1000]) do
toy_catalogue.each do |toy|
start_new_page
image toy[:plan_view], :at => [0,900], :width => 580
image toy[:front_view], :at => [0, 500], :width => 585
font_size(20) { draw_text toy[:name], :at => [5, 920] }
draw_text "production_date = #{toy[:date]}", :at => [420, 930]
end
end
end
That should be easy enough to adapt to your purposes.
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