Class: GnuplotRB::Terminal

Inherits:
Object
  • Object
show all
Includes:
ErrorHandling
Defined in:
lib/gnuplotrb/staff/terminal.rb

Overview

Overview

Terminal keeps open pipe to gnuplot process, cares about naming in-memory datablocks (just indexing with sequential integers). All the output to gnuplot handled by this class. Terminal also handles options passed to gnuplot as ‘set key value’.

Constant Summary collapse

OPTION_ORDER = 
[:term, :output, :multiplot, :timefmt, :xrange]

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ErrorHandling

#check_errors

Constructor Details

#initialize(persist: false) {|_self| ... } ⇒ Terminal

Overview

Creates new Terminal connected with gnuplot. Uses Settings::gnuplot_path to find gnuplot executable. Each time you create Terminal it starts new gnuplot subprocess which is closed after GC deletes linked Terminal object.

Arguments

  • persist - gnuplot’s -persist option

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/gnuplotrb/staff/terminal.rb', line 31

def initialize(persist: false)
  @cmd = Settings.gnuplot_path
  @current_datablock = 0
  @cmd += ' -persist' if persist
  @cmd += ' 2>&1'
  stream = IO.popen(@cmd, 'w+')
  handle_stderr(stream)
  ObjectSpace.define_finalizer(self, proc { Terminal.close_arg(stream) })
  @in = stream
  yield(self) if block_given?
end

Class Method Details

.close_arg(stream) ⇒ Object

Close given gnuplot pipe



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# File 'lib/gnuplotrb/staff/terminal.rb', line 15

def close_arg(stream)
  stream.puts
  stream.puts 'exit'
  Process.waitpid(stream.pid)
end

Instance Method Details

#<<(item) ⇒ Object

Overview

Short way to plot Datablock, Plot or Splot object. Other items will be just piped out to gnuplot.



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# File 'lib/gnuplotrb/staff/terminal.rb', line 120

def <<(item)
  if item.is_a? Plottable
    item.plot(self)
  else
    stream_print(item.to_s)
  end
  self
end

#close ⇒ Object

Overview

Send gnuplot command to turn it off and for its Process to quit. Closes pipe so Terminal object should not be used after #close call.



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# File 'lib/gnuplotrb/staff/terminal.rb', line 163

def close
  check_errors
  Terminal.close_arg(@in)
end

#options_hash_to_string(options) ⇒ Object

Overview

Converts given options to gnuplot format; for val1, .. , optN: valN it returns

set opt1 val1
..
set optN valN
Arguments

  • options - hash of options to convert



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# File 'lib/gnuplotrb/staff/terminal.rb', line 75

def options_hash_to_string(options)
  result = ''
  options.sort_by { |key, _| OPTION_ORDER.find_index(key) || -1 }.each do |key, value|
    if value
      result += "set #{OptionHandling.option_to_string(key, value)}\n"
    else
      result += "unset #{key}\n"
    end
  end
  result
end

#replot(**options) ⇒ Object

Overview

Call replot on gnuplot. This will execute last plot once again with rereading data.



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# File 'lib/gnuplotrb/staff/terminal.rb', line 151

def replot(**options)
  set(options)
  stream_puts('replot')
  unset(options.keys)
  sleep 0.01 until File.size?(options[:output]) if options[:output]
  self
end

#set(options) ⇒ Object

Overview

Applies given options to current gnuplot instance; for val1, .. , optN: valN it will output to gnuplot

set opt1 val1
..
set optN valN
Arguments

options - hash of options to set

Examples
set({term: ['qt', size: [100, 100]]})
#=> outputs to gnuplot: "set term qt size 100,100\n"



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# File 'lib/gnuplotrb/staff/terminal.rb', line 99

def set(options)
  OptionHandling.validate_terminal_options(options)
  stream_puts(options_hash_to_string(options))
end

#store_datablock(data) ⇒ Object

Overview

Outputs datablock to this gnuplot terminal.

Arguments

  • data - data stored in datablock

Examples
data = "1 1\n2 4\n3 9"
Terminal.new.store_datablock(data)
#=> returns '$DATA1'
#=> outputs to gnuplot:
#=>   $DATA1 << EOD
#=>   1 1
#=>   2 4
#=>   3 9
#=>   EOD



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# File 'lib/gnuplotrb/staff/terminal.rb', line 58

def store_datablock(data)
  name = "$DATA#{@current_datablock += 1}"
  stream_puts "#{name} << EOD"
  stream_puts data
  stream_puts 'EOD'
  name
end

#stream_print(command) ⇒ Object

Overview

Just prints command to gnuplot pipe and returns self to allow chaining.



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# File 'lib/gnuplotrb/staff/terminal.rb', line 141

def stream_print(command)
  check_errors
  @in.print(command)
  self
end

#stream_puts(command) ⇒ Object

Overview

Just puts command to gnuplot pipe and returns self to allow chaining.



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# File 'lib/gnuplotrb/staff/terminal.rb', line 133

def stream_puts(command)
  stream_print("#{command}\n")
end

#unset(*options) ⇒ Object

Overview

Unset some options

Arguments

  • *options - Array of options need to unset



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# File 'lib/gnuplotrb/staff/terminal.rb', line 109

def unset(*options)
  options.flatten
         .sort_by { |key| OPTION_ORDER.find_index(key) || -1 }
         .each { |key| stream_puts "unset #{OptionHandling.string_key(key)}" }
  self
end