#!/usr/bin/env ruby
##################################################
=begin
= NAME

gpview - quick viewer for the values of a variable specified by a gtool4-type URL. 


(1) for 1-dimensional variable, make line plot.
(2) for 2-dimensional variable, make contour/tone plot.
(3) for 3/more-dimensional variable, make contour/tone plot, 
    select first 2D. possible to make animation.
    
= USAGE

The first command form is 

    % gpview [options] gturl1 gturl2 gturl3 ...

where the format of the gturl is

    path[@|/]varname[,dimname=pos1[:pos2[:thinning_intv]][,dimname=...]]

The second commnad form is 

    % gpview --var url [options] gtfile1 gtfile2 ...

where the format of the url is 

    varname[,dimname=pos1[:pos2[:thinning_intv]][,dimname=...]]

= OPTIONS

if you want to know more description, please read

  http://ruby.gfd-dennou.org/products/gphys/doc/gpview.html

== GLOBAL OPTIONS

:--help: 
  print this message. 

:--var url:
  set the variable name and slicing parameters.

:--wsn [1-4]:
  set work staion number. each number represent output device:
  1 : X window.
  2 : PS file. (named dcl.ps) 
  3 : Tcl/Tk file.
  4 : GTK Windows (depend on dcl-5.3)

:--clrmap [1-]:
  set colormap to draw tone/contour.

:--itr [1-4,5-7,10-15,20-23,30-33]:
  set axis scale. default is 1.
  1 : linear scale for x/y axis 
  2 : linear scale for x , log scale for y axis
  3 : log scale for x , linear scale for y axis
  4 : log scale for x/y axis

:--similar [simfac,vxoff,vyoff]:
  (for 5<=itr<=7) set similarity parameters which are fed in DCL.grssim. 

:--map_axis [uxc,uyc,rot]:
  (for 10<=itr<=33) set mapping parameters which are fed in DCL.umpcnt. 

:--map_radius <radius>:
  (for itr>=20) set clipping radius (degree) around the tangential point. 
  Deafault=90.

:--xcoord [xcoord]
  name of x-coordinate (use for associate coordinates)

:--ycoord [ycoord]
  name of y-coordinate (use for associate coordinates)

:--title:
  set title of figure

:--aspect <aspect>:
  set aspect ratio of Viewport. default is 2.0.

:--noannotate:
  not draw annotations. 

:--animate/anim <dim>:
  plot animation along <dim>. <dim> must be name of dimension. 

:--alternate, --Ga: 
  enable to backing store.

:--nowait, --Gw:
  not wait for any actions if animate 

:--reverse, --Gr:
  plot animation reversible if animate

:--smooth, --Gaw:
  equal to --anlternate && --nowait

:--exch:
  exchange(transpose) x/y axis.

:--mean <dim>:
  mean along axis <dim>. 

:--stddev <dim>:
  standard deviation along axis <dim>.

:--eddy <dim>:
  deviation from mean along axis <dim>. 

:--diff:
  calculate the difference of two variables.
  you must provide two gturls whose size and dimension are same.  

:--m, --map <map_type>: 
  plot map. itr number must be set.  this option is neglect if itr
  number is 1-4.  abailable map type is coast_world, border_world,
  plate_world, state_usa, coast_japan, pref_japan

:--operation <math_func>: 
  operation of the specified math function on the data.
  <math_func> should be a math function with one argument 
  such as log10, sqrt, sin, etc.

:--time_ax [nil|false|h|ymd]: 
  specify type of calendar-type time axis: 
    nil   (=> auto slection)
    false (=> do not use the time axis even if 
              the units of the axis is a time one with since field)
    "h"   (=> like nil, but always use the hour-resolving datetime_ax method
              in dclext_datetime_ax.rb)
    "ymd" (=> like "h" but for y-m-d type using DCL.uc[xy]acl)

:-xx:yyyy=value:
  specify Dennou Club Library internal variable. 
  'xx' is a package name prefix of DCL (eg. sg=>sgpack).
  'yy' is a variable name of DCL.
  'value' is a value of the DCL variable.

== LINE/MARK OPTIONS

:--line:
  make line plot forced. (about first 1D)

:--mark:
  make mark plot forced. (about first 1D)

:--index:
  set DCL line index, which set the color/thickness of the line
  primitive. please see DCL documents.

:--type:
  set line type.

:--range [min:max]
  set min/max value for line plot. min or max must be set.

:--overplot
  set number of lines on each figure.

:--overplot_color, --Opc
  multiple lines are distinguished with color rather than line type.
  
== CONTOUR/TONE OPTIONS

:--shade:
  make contour and tone plot.

:--noshade:
  make contour plot, without tone.

:--nocont:
  make tone plot, without contour.

:--range [min:max]:
  set min/max value for contour/tone plot. min or max must be set.

:--crange:
  set min/max value for contour plot. this is more dominant than --range

:--srange:
  set min/max value for tone plot. this is more dominant than --interval/int

:--interval,--int [num]: 
  set interval value for contour/tone plot. set the number of lines if
  you set negative value.

:--cint:
  set interval value for contour plot. this is more dominant 
  than --interval/int

:--sint:               
  set interval value for tone plot. this is more dominant than --interval/int.
                           
:--levels:             
  set values of contour/tone levels. 

:--clevels:            
  set values of contour levels. 

:--slevels:           
  set tone of contour levels. 

:--patterns:           
  set each patterns for tone plot. 

:--tone [a|e|f|b|c]:
  set tone subroutine:
    a (=> tone routine is selected automatically depending on the datasize)
    e (=> DCL.uetone is used)
    f (=> DCL.uetonf is used)
    b (=> DCL.uetonb is used)
    c (=> DCL.uetonc is used)

:--nocolorbar:         
  do not draw color bar

:--nozero:             
  do not draw zero contour

:--udsfmt [strings]:
  change contour label format. see UDCNTR/DCL manual for the format.

== EXAMPLES

For a single GPhys variable, 

    % gpview data.nc@temp
    % gpview data.nc@temp,lon=130:150,lat=0:90:2
    % gpview --nocont data.nc@temp,lon=130:150,lat=0    
    % gpview --noshade data.nc@temp,lon=130:150,lat=0    
    % gpview --mean lon data.nc@temp,lon=130:150,lat=0
    % gpview --exch data.nc@temp,lon=130:150,lat=0
    % gpview --animate lon data.nc@temp,lon=130:150
    % gpview --animate lon --alternate data.nc@temp
    % gpview --smooth lon data.nc@temp,lon=130:150
    % gpview --levels 0,10,20,30 --pattern 30999,40999,50999,60999,70999 data.nc@temp
    % gpview --overplot=3 --anim t data.nc@temp,lon=0
    % gpview --mark data.nc@temp,lon=0,lat=0
    % gpview --operation log10 data.nc@temp,lon=0
    % gpview --time_ax false data.nc@temp,lon=0,lat=0

Example to set DCL internal variable,
    % gpview -ud:lmsg=false --itr 5 --exch data.nc@temp,lon=0

For multiple GPhys variables, 
    % gpview data1.nc@temp data2.nc@temp
    % gpview data1.nc@temp,lon=130:150 data2.nc@temp,lon=150:170
    % gpview --overplot=3 --anim t data.nc@temp,lon=0 data.nc@temp,lon=10
    % gpview --var temp,lon=130:150 data?.nc 
    % gpview --anim t --var temp,lon=130:150 data*.nc 


== HISTORY

  2004/12/14  D Tsukahara && T Horinouti(parse_gturl)
  2005/01/08  D Tsukahara (add option --exch and able to invalid value)
  2005/01/09  D Tsukahara (add option --animate, smooth, alternate, index )
  2005/01/10  D Tsukahara (transpose axis with attr "positive:down" ,
                           abailable loopsense_flag. )
  2005/01/10  D Tsukahara (implement GGraph::color_bar, and margin_info, 
                           which file name, date, and toolname. )
  2005/01/11  D Tsukahara ( 1. write document about OPTIONS. 
                            2. add many options. more info please see document. )
  2005/01/23  S Takehiro  (add option --similar, map_axis)
  2005/02/09  D Tsukahara && M Nakano (add option --reverse, --Gr, --map)
  2005/02/10  D Tsukahara (change option parser (getopts => getoptlong))
  2005/02/24  D Tsukahara (apply --range for line plot)
  2005/06/15  S Takehiro (add option --levels, --clevels, --slevels, --patterns)
  2005/06/17  S Takehiro (missing_value attribute setting removed)
  2005/06/22  S Takehiro (debug, clipping control added to GGraph::annotate)
  2005/06/23  S Takehiro (debug, option --title implemented)
  2005/07/15  S Takehiro (option --noannotate implemented)
  2005/08/07  S Takehiro (option --overplot implemented)
  2005/08/09  S Takehiro && T Horinouchi (add option --help and help function.
                                            URL information corrected. )
  2005/08/23  S Takehiro (multiple Gphys variables plotting 
                           and option --var implemented)
  2005/08/23  S Takehiro (common methods to gp* command moved to gpcommon.rb)
  2005/10/30  S Takehiro (option --animate recoverd)
  2005/10/31  S Takehiro (option --smooth bug fixed)
  2006/03/07  M Nakano (option --int bug fixed)
  2007/10/03  S Takehiro (option --nocolorbar implemented)
  2008/04/03  S Takehiro (option --nozero implemented)
  2008/12/14  S Takehiro (option --mark implemented)
  2010/03/10  Y SASAKI (change help block into RD format)
  2011/01/14  T Tanigawa && S Takehiro (option --operation implemented)
  2011/11/04  S Takehiro (option --time_ax implemented)
  2011/11/20  S Takehiro (option --eddy implemented)
  2012/02/19  S Takehiro (description for gturl format updated)
  2013/01/29  T Tanigawa && S Takehiro (calculation of aspect ratio 
                                        of viewport improved)
  2013/01/29  S Nishizawa && S Takehiro (sequential operation implemented)
  2014/02/21  Y Naito && S Takehiro (implement DCL internal variable setting,
                                     add option --udsfmt)
  2014/02/21  S Noda && S Takehiro (add option --stddev)
  2014/02/23  S Takehiro (option --tonf is changed to --tone)
  2014/03/05  S Takehiro (add option --map_radius)
  2014/03/10  Y Kawai && S Takehiro (setting labels for contours)
  2014/04/06  S Takehiro (option --map_radius bug fix)
  2014/06/27  S Nishizawa && S Takehiro (add options --xcoord, --ycoord)
  2014/11/28  H Kashimura && S Takehiro (add option --diff, --tone bug fix)
  2014/11/28  Y O Takahashi && S Takehiro (add option --overplot_color, --Opc)

=end
#################################################
require "getoptlong"        # for option_parse
require "numru/ggraph"      # ggraph library
require "numru/gphys/gpcommon"

include NumRu

#####################################################
## Default param.

VIEWPORT = [0.15,0.85,0.2,0.55]
URLfmt = "path[@|/]varname[,dimname=pos1[:pos2[:thinning_intv]][,dimname=...]]"

#####################################################
def GGraph::annotate(str_ary)
  lclip = DCL.sgpget('lclip')
  DCL.sgpset('lclip',nil)
  lnum = 0
  str_ary.each{ |str|lnum += 1 }
    charsize = 0.7 * DCL.uzpget('rsizec1')
  dvx = 0.01
  dvy = charsize*1.5
  raise TypeError,"Array expected" if ! str_ary.is_a?(Array)
  vxmin,vxmax,vymin,vymax = DCL.sgqvpt
  vx = 0.70
  vy = 0.045 + (lnum-1)*dvy
  str_ary.each{|str|
    DCL::sgtxzv(vx,vy,str,charsize,0,-1,1)
    vy -= dvy
  }
  DCL.sgpset('lclip',lclip)
  nil
end

def each_along_dims(gphys, loopdim)

  raise ArgumentError,"1st argument must be an GPhys." if !gphys.is_a?(GPhys)
  if loopdim.is_a?(String)
    dimname = loopdim
  elsif
    if loopdim < 0 
      dimname = gphys.coord(gphys.rank + loopdim).name
    else
      dimname = gphys.coord(loopdim).name
    end
  else
    raise ArgumentError,"loopdims must consist of Integer and/or String"
  end

  loopdim_na = gphys.coord(dimname).val                      # get coord ary
  loopdim_na = loopdim_na[-1..0] if $OPT_reverse || $OPT_Gr  # reverse  
  loopdim_na.each { |x|
    yield( gphys.cut(dimname=>x) )
  }
end


def draw_setup

  # set missing value
  DCLExt.gl_set_params('lmiss'=>true)

  # fontsize
  DCL.sgpset('lcntl', false)
#  DCL.uzfact(0.7)
  DCL.sgpset('lfull', true)               # use full area in the window
  DCL.sgpset('lfprop',true)               # use proportional font
  DCL.uscset('cyspos', 'B' )              # move unit y axis
  
  # viewport size
  GGraph.set_fig('viewport'=>$VIEWPORT)
  GGraph.set_fig( 'itr'=>($OPT_itr == nil) ? 1 : $OPT_itr.to_i )
  GGraph.set_fig("xrev"=>"units:mb,units:hPa,units:millibar,positive:down",  
                 "yrev"=>"units:mb,units:hPa,units:millibar,positive:down") 

  # set options
  min_range,  max_range  = __split_range($OPT_range)
  min_crange, max_crange = __split_range($OPT_crange)
  min_srange, max_srange = __split_range($OPT_srange)
  GGraph.set_linear_contour_options(
                                    'int' => ( $OPT_cint   || $OPT_interval || $OPT_int ),
                                    'min' => ( min_crange  || min_range ),
                                    'max' => ( max_crange  || max_range )
                                    )
  GGraph.set_linear_tone_options(
                                    'int' => ( $OPT_sint   || $OPT_interval || $OPT_int ),
                                    'min' => ( min_srange  || min_range ),
                                    'max' => ( max_srange  || max_range )
                                 )

  if ( $OPT_clevels || $OPT_levels )
    $OPT_label=($OPT_clevels || $OPT_levels).split(',')
    $OPT_clevels=($OPT_clevels || $OPT_levels).split(',').map!{|v| v.to_f }
  end

  if ( $OPT_slevels || $OPT_levels )
    $OPT_slevels=($OPT_slevels||$OPT_levels).split(',').map!{|v| v.to_f }
  end

  if ( $OPT_patterns )
    $OPT_patterns=$OPT_patterns.split(',').map!{|v| v.to_f }
  end

  # similar projection
  if ($OPT_similar)
    if /([\d\-.]*),([\d\-.]*),([\d\-.]*)/ =~ $OPT_similar
      similar=[$1.to_f,$2.to_f,$3.to_f]
    elsif /([\d\-.]*),([\d\-.]*)/ =~ $OPT_similar
      similar=[$1.to_f,$2.to_f,0]
    elsif /([\d\-.]*)/ =~ $OPT_similar
      similar=[$1.to_f,0,0]
    end
    GGraph.set_fig('similar'=>similar)
  end

  # similar projection
  if ($OPT_map_axis)
    if /([\d\-.]*),([\d\-.]*),([\d\-.]*)/ =~ $OPT_map_axis
      map_axis=[$1.to_f,$2.to_f,$3.to_f]
    elsif /([\d\-.]*),([\d\-.]*)/ =~ $OPT_map_axis
      map_axis=[$1.to_f,$2.to_f,0]
    elsif /([\d\-.]*)/ =~ $OPT_similar
      map_axis=[$1.to_f,0,0]
    end
    GGraph.set_fig('map_axis'=>map_axis)
  end

  # clipping parameter
  if ( $OPT_map_radius )
    map_radius=$OPT_map_radius.to_f
  else
    map_radius=90.0
  end
  GGraph.set_fig('map_radius'=>map_radius)

  # map
  if ( $OPT_m || $OPT_map)
    map_type = "coast_world"     if $OPT_m
    map_type = $OPT_map          if $OPT_map
    GGraph::set_map(map_type=>true)
  end

  # time axis 
  if ($OPT_time_ax)
    $OPT_time_ax = false if $OPT_time_ax == "false"
    GGraph.set_axes('time_ax'=>$OPT_time_ax)
  end

end

def draw(gp, draw_flag)

  # draw hontai
  case draw_flag
  when "line"
    if ( $Overplot == 1 ) 
      GGraph.line(gp, 
                  true,
                  "title"=>$OPT_title,
                  "index"=>($OPT_index||1),
                  "type" =>($OPT_type ||1),
                  "exchange"=>$OPT_exch,
                  "annotate"=>$annotate,
                  "min" => __split_range($OPT_range)[0],
                  "max" => __split_range($OPT_range)[1]
                  )
    elsif ( $OPT_overplot_color || $OPT_Opc )
      GGraph.line(gp, 
                  false,
                  "title"=>$OPT_title,
                  "index"=>($OPT_index.to_i+$Overplot*10),
                  "type" =>($OPT_type ||1),
                  "exchange"=>$OPT_exch,
                  "annotate"=>$annotate,
                  "min" => __split_range($OPT_range)[0],
                  "max" => __split_range($OPT_range)[1]
                  )
    else
      GGraph.line(gp, 
                  false,
                  "title"=>$OPT_title,
                  "index"=>($OPT_index||1),
                  "type" =>($OPT_type ||$Overplot),
                  "exchange"=>$OPT_exch,
                  "annotate"=>$annotate,
                  "min" => __split_range($OPT_range)[0],
                  "max" => __split_range($OPT_range)[1]
                  )
    end
    if ( $Overplot < $Overplot_max )
      $Overplot += 1
    else
      $Overplot = 1 
    end

  when "mark"
    if ( $Overplot == 1 ) 
      GGraph.mark(gp, 
                  true,
                  "title"=>$OPT_title,
                  "index"=>($OPT_index||1),
                  "type" =>($OPT_type ||1),
                  "exchange"=>$OPT_exch,
                  "annotate"=>$annotate,
                  "min" => __split_range($OPT_range)[0],
                  "max" => __split_range($OPT_range)[1]
                  )
    else
      GGraph.mark(gp, 
                  false,
                  "title"=>$OPT_title,
                  "index"=>($OPT_index||1),
                  "type" =>($OPT_type ||$Overplot),
                  "exchange"=>$OPT_exch,
                  "annotate"=>$annotate,
                  "min" => __split_range($OPT_range)[0],
                  "max" => __split_range($OPT_range)[1]
                  )
    end
    if ( $Overplot < $Overplot_max )
      $Overplot += 1
    else
      $Overplot = 1 
    end

  when "full"
    GGraph.tone(gp,
                true, 
                "title"=>$OPT_title,
                "annotate"=>$annotate,
                "transpose"=>$OPT_exch,
                "levels"=>$OPT_slevels,
                "patterns"=>$OPT_patterns,
                "auto"=>$auto,
                "tonf"=>$tonf,
                "tonb"=>$tonb,
                "tonc"=>$tonc,
                "xcoord"=>$OPT_xcoord,
                "ycoord"=>$OPT_ycoord
                )
    GGraph.contour(gp, 
		   false,
		   "transpose"=>$OPT_exch,
		   "levels"=>$OPT_clevels,
		   "nozero"=>$OPT_nozero,
                   "label"=>$OPT_label,
                   "xcoord"=>$OPT_xcoord,
                   "ycoord"=>$OPT_ycoord
		   )
  when "nocont"
    GGraph.tone(gp,
                true, 
                "title"=>$OPT_title,
                "annotate"=>$annotate,
                "transpose"=>$OPT_exch,
                "levels"=>$OPT_slevels,
                "patterns"=>$OPT_patterns,
                "auto"=>$auto,
                "tonf"=>$tonf,
                "tonb"=>$tonb,
                "tonc"=>$tonc,
                "xcoord"=>$OPT_xcoord,
                "ycoord"=>$OPT_ycoord
                )
  when "noshade"
    mj = DCL.udpget('indxmj')
    mn = DCL.udpget('indxmn')
    GGraph.contour(gp, 
                   true, 
                   "title"    =>$OPT_title,
                   "annotate"=>$annotate,
		   "transpose"=>$OPT_exch,
                   "levels"=>$OPT_clevels, 
                   "nozero"=>$OPT_nozero,
                   "label"=>$OPT_label,
                   "xcoord"=>$OPT_xcoord,
                   "ycoord"=>$OPT_ycoord
                   )
  end

  # color bar
  if ( ( draw_flag == "full") || ( draw_flag == "nocont") ) && $colorbar
    GGraph::color_bar(
                      "left"      => true,
                      "landscape" => true
                      )
  end

end


def set_vpsize( default_vp, aspect=2.0 )

  raise "#{aspect} must be a positive Numeric" if (aspect.to_f <= 0.0)
  aspect = aspect.to_f

  # default viewport
  x0 = default_vp[0]; x1 = default_vp[1]
  y0 = default_vp[2]; y1 = default_vp[3]
  # viewport size
  hlength =   x1 - x0
  vlength =   y1 - y0
  # center grid of viewport
  cen_of_vp = [ x0 + hlength/2.0, y0 + vlength/2.0  ] 

  if aspect <= hlength / vlength
    hlength = vlength * aspect
    x0 = cen_of_vp[0] - hlength/2.0
    x1 = cen_of_vp[0] + hlength/2.0
  else
    vlength = hlength / aspect     
    y0 = cen_of_vp[1] - vlength/2.0
    y1 = cen_of_vp[1] + vlength/2.0
  end  

  return [ x0, x1, y0, y1 ]

end

def __split_range(range)

  if /(.*):(.*)/ =~ range
    if $1 == ""
      min = nil
    else
      min = $1.to_f
    end
    if $2 == ""
      max = nil
    else
      max = $2.to_f
    end
  elsif range == nil
    min = max = nil
  else
    raise "invalid range: variable subset specification error. split range with ':'\n\n"
  end
  
  return min, max
end

def check_dclopts

  indices = []
    ARGV.each_index{|i|
    if /^-(.)(.):(.*)=(.*)/ =~ ARGV[i]
      indices << i
    end
    }

  dclopts = []
    indices.reverse_each{|i|
    dclopts << ARGV[i]
    ARGV.slice!(i)
    }

  dclopts.each{|opt|
    pkg = opt[1..2]
    name = opt[4..-1].split('=')[0]
    value = opt[4..-1].split('=')[1]
    dcl_set_params(pkg,name,value)
  }
  
end

def dcl_set_params(pkg,name,value)

  set = 'stx'
  case name
  when /^c/i
    eval( "DCL.#{pkg}c#{set}(name,value.to_s)" )
  when /^l/i
    if /(.*)(T|t)(.*)/ =~ value
      eval( "DCL.#{pkg}l#{set}(name,true)" )
    else
    if /(.*)(F|f)(.*)/ =~ value
      eval( "DCL.#{pkg}l#{set}(name,false)" )
    else
      raise "value of logical parameter must include 't' or 'f'"
    end
    end
  when /^[i-n]/i
    eval( "DCL.#{pkg}i#{set}(name,value.to_i)" )
  else
    eval( "DCL.#{pkg}r#{set}(name,value.to_f)" )
  end
  
end

#####################################################
###++++++           Main Routine            ++++++###

## options for DCL
check_dclopts

## parse options
parser = GetoptLong.new
parser.set_options(
                   ###    global option   ###
                   ['--var',                      GetoptLong::REQUIRED_ARGUMENT],
                   ['--wsn',                      GetoptLong::REQUIRED_ARGUMENT],
                   ['--clrmap',                   GetoptLong::REQUIRED_ARGUMENT],
                   ['--itr',                      GetoptLong::REQUIRED_ARGUMENT],
                   ['--similar',                  GetoptLong::REQUIRED_ARGUMENT],
                   ['--map_axis',                 GetoptLong::REQUIRED_ARGUMENT],
                   ['--map_radius',               GetoptLong::REQUIRED_ARGUMENT],
                   ['--xcoord',                   GetoptLong::REQUIRED_ARGUMENT],
                   ['--ycoord',                   GetoptLong::REQUIRED_ARGUMENT],
                   ['--title',                    GetoptLong::REQUIRED_ARGUMENT],
                   ['--aspect',                   GetoptLong::REQUIRED_ARGUMENT],
                   ['--anim',                     GetoptLong::REQUIRED_ARGUMENT],
                   ['--animate',                  GetoptLong::REQUIRED_ARGUMENT],
                   ['--noannotate',               GetoptLong::NO_ARGUMENT],
                   ['--alternate',                GetoptLong::NO_ARGUMENT],
                   ['--Ga',                       GetoptLong::NO_ARGUMENT],
                   ['--nowait',                   GetoptLong::NO_ARGUMENT],
                   ['--Gw',                       GetoptLong::NO_ARGUMENT],
                   ['--smooth',                   GetoptLong::NO_ARGUMENT],
                   ['--Gaw',                      GetoptLong::NO_ARGUMENT],
                   ['--exch',                     GetoptLong::NO_ARGUMENT],
                   ['--reverse',                  GetoptLong::NO_ARGUMENT],
                   ['--Gr',                       GetoptLong::NO_ARGUMENT],
                   ['--mean',                     GetoptLong::REQUIRED_ARGUMENT],
                   ['--stddev',                   GetoptLong::REQUIRED_ARGUMENT
],
                   ['--eddy',                     GetoptLong::REQUIRED_ARGUMENT],
                   ['--diff',                     GetoptLong::NO_ARGUMENT],                   
                   ['--map',                      GetoptLong::REQUIRED_ARGUMENT],
                   ['--m',                        GetoptLong::NO_ARGUMENT],
                   ['--operation',                GetoptLong::REQUIRED_ARGUMENT],
                   ['--time_ax',                  GetoptLong::REQUIRED_ARGUMENT],
                   ###     line/mark option    ###
                   ['--line',                     GetoptLong::NO_ARGUMENT],
                   ['--mark',                     GetoptLong::NO_ARGUMENT],
                   ['--index',                    GetoptLong::REQUIRED_ARGUMENT],
                   ['--type',                     GetoptLong::REQUIRED_ARGUMENT],
                   ['--overplot',                 GetoptLong::REQUIRED_ARGUMENT],
                   ['--overplot_color',           GetoptLong::NO_ARGUMENT],
                   ['--Opc',                      GetoptLong::NO_ARGUMENT],
                   ### tone or cont option ###
                   ['--nocont',                   GetoptLong::NO_ARGUMENT],
                   ['--noshade',                  GetoptLong::NO_ARGUMENT],
                   ['--range',                    GetoptLong::REQUIRED_ARGUMENT],
                   ['--crange',                   GetoptLong::REQUIRED_ARGUMENT],
                   ['--srange',                   GetoptLong::REQUIRED_ARGUMENT],
                   ['--interval',                 GetoptLong::REQUIRED_ARGUMENT],
                   ['--int',                      GetoptLong::REQUIRED_ARGUMENT],
                   ['--cint',                     GetoptLong::REQUIRED_ARGUMENT],
                   ['--sint',                     GetoptLong::REQUIRED_ARGUMENT],
                   ['--levels',                   GetoptLong::REQUIRED_ARGUMENT],
                   ['--clevels',                  GetoptLong::REQUIRED_ARGUMENT],
                   ['--slevels',                  GetoptLong::REQUIRED_ARGUMENT],
                   ['--patterns',                 GetoptLong::REQUIRED_ARGUMENT],
                   ['--tone',                     GetoptLong::REQUIRED_ARGUMENT],
                   ['--udsfmt',                   GetoptLong::REQUIRED_ARGUMENT],
                   ['--nocolorbar',               GetoptLong::NO_ARGUMENT],
                   ['--nozero',                   GetoptLong::NO_ARGUMENT],
                   ['--help',                     GetoptLong::NO_ARGUMENT]
#                   ['--version',                  GetoptLong::NO_ARGUMENT]  # to be defined
                   )
begin
  parser.each_option do |name, arg|
    eval "$OPT_#{name.sub(/^--/, '').gsub(/-/, '_')} = '#{arg}'"  # strage option value to $OPT_val
  end
rescue
  help
  raise
end

## Print out help message
if ($OPT_help)
  help 
  exit(1)
end

## set some figure option
DCL::swlset('lwait', false) if ($OPT_nowait    || $OPT_Gw || $OPT_smooth || $OPT_Gaw)
                                           # set wait or nowait
DCL::swlset('lalt',  true)  if ($OPT_alternate || $OPT_Ga || $OPT_smooth || $OPT_Gaw)
                                           # set backing store option
if ($OPT_noannotate)
  $annotate = false 
else
  $annotate = true
end

$Overplot_max = ( $OPT_overplot.to_i || 1 )
$Overplot = 1

if ($OPT_nocolorbar)
  $colorbar = false 
else
  $colorbar = true
end

if ($OPT_tone) 
  case $OPT_tone
  when "a"
    $auto, $tonf, $tonb, $tonc = true,false,false,false
  when "e"
    $auto, $tonf, $tonb, $tonc = false,false,false,false
  when "f"
    $auto, $tonf, $tonb, $tonc = false,true,false,false
  when "b"
    $auto, $tonf, $tonb, $tonc = false,false,true,false
  when "c"
    $auto, $tonf, $tonb, $tonc = false,false,false,true
  else
    raise "The value of option --tone should be 'a','e','f','b' or 'c'."
  end
else
  $auto, $tonf, $tonb, $tonc = true,false,false,false
end

## decide VIEWPORT
$VIEWPORT = set_vpsize( VIEWPORT, ($OPT_aspect||2.0) )

## tune the size of axis parameters.
DCL.uzfact(0.7)

## set the format of contour labels.
udsfmt = ($OPT_udsfmt||DCL.udqfmt())
DCL.udsfmt(udsfmt)

## draw figure
loopdim   = ( $OPT_animate || $OPT_anim ) 
loopdim = loopdim.to_i if loopdim.to_i.to_s == loopdim

### set colormap
DCL.sgscmn($OPT_clrmap||1)
## open work station
DCL.gropn($OPT_wsn||4)

## open netcdf variables

while ARGV[0] do
  gturl = ARGV[0]
  gturl = gturl+'@'+$OPT_var if $OPT_var

  gp = GPhys::IO.open_gturl(gturl)
  print "  Reading #{gturl}\n"
  ARGV.shift 

  ## for case of calculating difference of two gphys object
  if ($OPT_diff)
    raise "--diff option must be used with even numbers (2, 4, 6,...) of gturls" if ARGV[0] == nil
    prev_gturl = gturl
    gturl = ARGV[0]
    gturl = gturl+'@'+$OPT_var if $OPT_var
    print "  Reading #{gturl}\n"
    gp = gp - GPhys::IO.open_gturl(gturl)
    print "  Taking difference: #{prev_gturl} - #{gturl}\n"
    gturl = prev_gturl+" - "+gturl
    ARGV.shift 
  end
  
  ## mean along any axis
  if ($OPT_mean)
    dims_mean = ($OPT_mean).split(/\s*,\s*/)
    dims_mean = dims_mean.map{|dim| dim.to_i.to_s == dim ? dim.to_i : dim}
  end

  ## standard deviation along any axis
  if ($OPT_stddev)
    dims_stddev = ($OPT_stddev).split(/\s*,\s*/)
    dims_stddev = dims_stddev.map{|dim| dim.to_i.to_s == dim ? dim.to_i : dim}
  end

  ## deviation from mean along any axis
  if ($OPT_eddy)
    dims_eddy = ($OPT_eddy).split(/\s*,\s*/)
    dims_eddy = dims_eddy.map{|dim| dim.to_i.to_s == dim ? dim.to_i : dim}
  end

  GGraph.margin_info($0, gturl) if $annotate  # draw margin infomation
  draw_setup                                  # determine figure kind


  kind_of_fig = nil
  proc = Proc.new do |g|
      ## mean along any axis
      if ($OPT_mean)
        dims_mean.each{|dim|
          g = g.mean(dim)
        }
      end

      ## standard deviation along any axis
      if ($OPT_stddev)
        dims_stddev.each{|dim|
          g = g.stddev(dim)
        }
      end

      ## deviation from mean along any axis
      if ($OPT_eddy)
        dims_eddy.each{|dim|
          g = g.eddy(dim)
        }
      end

      ## operation of a mathematical function
      if ($OPT_operation)
        eval "g = g.#{$OPT_operation}"
      end

      # judge draw kind
      unless kind_of_fig
        gp_rank = g.rank
        if ($OPT_mark)
          kind_of_fig = "mark"
        elsif ($OPT_line || gp_rank == 1)
          kind_of_fig = "line"
        elsif (!$OPT_line && gp_rank >= 2) && !$OPT_noshade && $OPT_nocont 
          kind_of_fig = "nocont"
        elsif (!$OPT_line && gp_rank >= 2) && $OPT_noshade && !$OPT_nocont 
          kind_of_fig = "noshade"
        elsif (!$OPT_line && gp_rank >= 2) && !$OPT_noshade && !$OPT_nocont
          kind_of_fig = "full"
        end
      end  

      draw(g, kind_of_fig)
  end

  if loopdim           # animation
    each_along_dims(gp, loopdim){|gp_subset|
      proc.call(gp_subset)
    }
  else
    proc.call(gp)
  end

end

DCL.grcls