program main

!*****************************************************************************80
!
!! MAIN is the main program for TRIANGULATION_PLOT.
!
!  Discussion:
!
!    TRIANGULATION_PLOT plots a triangulated set of nodes.
!
!  Modified:
!
!    21 March 2005
!
!  Author:
!
!    John Burkardt
!
!  Usage:
!
!    triangulation_plot node_file tri_file
!
  implicit none

  integer arg_num
  integer dim_num
  integer iarg
  integer iargc
  character ( len = 256 ) :: input_node_filename = ' '
  character ( len = 256 ) :: input_triangulation_filename = ' '
  integer node_num
  integer node_show
  real ( kind = 8 ), allocatable, dimension ( :, : ) :: node_xy
  character ( len = 256 ) :: output_filename = ' '
  integer triangle_num
  integer triangle_order
  integer, allocatable, dimension ( :, : ) :: triangle_node
  integer triangle_show

  call timestamp ( )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TRIANGULATION_PLOT'
  write ( *, '(a)' ) '  FORTRAN90 version'
  write ( *, '(a)' ) '  Read a node dataset of NODE_NUM points in 2 dimensions.'
  write ( *, '(a)' ) '  Read an associated triangulation dataset of '
  write ( *, '(a)' ) '  TRIANGLE_NUM triangles in a triangulation of order'
  write ( *, '(a)' ) '  TRIANGLE_ORDER = 3 or 6 .'
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Make an EPS plot of the triangulated data.'
!
!  Get the number of command line arguments.
!
  arg_num = iargc ( )
!
!  If at least one command line argument, it's the node file name.
!
  if ( 1 <= arg_num ) then

    iarg = 1
    call getarg ( iarg, input_node_filename )

  else

    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'TRIANGULATION_PLOT:'
    write ( *, '(a)' ) '  Please enter the name of the node file.'

    read ( *, '(a)' ) input_node_filename

  end if
!
!  If at least two command line arguments, the second is the triangulation file.
!
  if ( 2 <= arg_num ) then

    iarg = 2

    call getarg ( iarg, input_triangulation_filename )

  else

    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'TRIANGULATION_PLOT:'
    write ( *, '(a)' ) '  Please enter the name of the triangulation file.'

    read ( *, '(a)' ) input_triangulation_filename

  end if

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Enter the option for showing the nodes:'
  write ( *, '(a)' ) '  0: do not show the nodes;'
  write ( *, '(a)' ) '  1:        show the nodes;'
  write ( *, '(a)' ) '  2:        show the nodes, and label them.'

  read ( *, * ) node_show

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Enter the option for showing the triangles:'
  write ( *, '(a)' ) '  0: do not show the triangles;'
  write ( *, '(a)' ) '  1:        show the triangles;'
  write ( *, '(a)' ) '  2:        show the triangles, and label them.'

  read ( *, * ) triangle_show
!
!  Need to create the output file name from the input filename.
!
  output_filename = input_node_filename
  call file_name_ext_swap ( output_filename, 'eps' )

  call dtable_header_read (  input_node_filename, dim_num, node_num )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Read the header of "' &
    // trim ( input_node_filename ) //'".'
  write ( *, '(a)' ) ' '
  write ( *, '(a,i8)' ) '  Spatial dimension DIM_NUM = ', dim_num
  write ( *, '(a,i8)' ) '  Number of nodes NODE_NUM  = ', node_num

  allocate ( node_xy(1:dim_num,1:node_num) )

  call dtable_data_read ( input_node_filename, dim_num, node_num, node_xy )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Read the data in "' &
    // trim ( input_node_filename ) //'".'

  call r8mat_transpose_print_some ( dim_num, node_num, node_xy, 1, 1, 5, 5, &
    '  5 by 5 portion of data read from file:' )
!
!  Read the triangulation data.
!
  call itable_header_read ( input_triangulation_filename, triangle_order, &
    triangle_num )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Read the header of "' &
    // trim ( input_triangulation_filename ) //'".'
  write ( *, '(a)' ) ' '
  write ( *, '(a,i8)' ) '  Triangle order TRIANGLE_ORDER = ', triangle_order
  write ( *, '(a,i8)' ) '  Number of triangles TRIANGLE_NUM  = ', triangle_num

  allocate ( triangle_node(1:triangle_order,1:triangle_num) )

  call itable_data_read ( input_triangulation_filename, triangle_order, &
    triangle_num, triangle_node )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Read the data in "' &
    // trim ( input_triangulation_filename ) //'".'

  call i4mat_transpose_print_some ( triangle_order, triangle_num, &
    triangle_node, 1, 1, 5, 5, '  5 by 5 portion of data read from file:' )
!
!  Create the output file.
!
  if ( triangle_order == 3 ) then

    call triangulation_order3_plot ( output_filename, node_num, node_xy, &
      triangle_num, triangle_node, node_show, triangle_show )

  else if ( triangle_order == 6 ) then

    call triangulation_order6_plot ( output_filename, node_num, node_xy, &
      triangle_num, triangle_node, node_show, triangle_show )

  end if

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Created the EPS file "' &
    // trim ( output_filename ) //'".'

  deallocate ( node_xy )
  deallocate ( triangle_node )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TRIANGULATION_PLOT'
  write ( *, '(a)' ) '  Normal end of execution.'

  write ( *, '(a)' ) ' '
  call timestamp ( )

  stop
end
subroutine ch_cap ( c )

!*****************************************************************************80
!
!! CH_CAP capitalizes a single character.
!
!  Modified:
!
!    19 July 1998
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input/output, character C, the character to capitalize.
!
  implicit none

  character c
  integer itemp

  itemp = ichar ( c )

  if ( 97 <= itemp .and. itemp <= 122 ) then
    c = char ( itemp - 32 )
  end if

  return
end
function ch_eqi ( c1, c2 )

!*****************************************************************************80
!
!! CH_EQI is a case insensitive comparison of two characters for equality.
!
!  Examples:
!
!    CH_EQI ( 'A', 'a' ) is .TRUE.
!
!  Modified:
!
!    28 July 2000
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character C1, C2, the characters to compare.
!
!    Output, logical CH_EQI, the result of the comparison.
!
  implicit none

  logical ch_eqi
  character c1
  character c1_cap
  character c2
  character c2_cap

  c1_cap = c1
  c2_cap = c2

  call ch_cap ( c1_cap )
  call ch_cap ( c2_cap )

  if ( c1_cap == c2_cap ) then
    ch_eqi = .true.
  else
    ch_eqi = .false.
  end if

  return
end
subroutine ch_to_digit ( c, digit )

!*****************************************************************************80
!
!! CH_TO_DIGIT returns the integer value of a base 10 digit.
!
!  Example:
!
!     C   DIGIT
!    ---  -----
!    '0'    0
!    '1'    1
!    ...  ...
!    '9'    9
!    ' '    0
!    'X'   -1
!
!  Modified:
!
!    04 August 1999
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character C, the decimal digit, '0' through '9' or blank
!    are legal.
!
!    Output, integer DIGIT, the corresponding integer value.  If C was
!    'illegal', then DIGIT is -1.
!
  implicit none

  character c
  integer digit

  if ( lge ( c, '0' ) .and. lle ( c, '9' ) ) then

    digit = ichar ( c ) - 48

  else if ( c == ' ' ) then

    digit = 0

  else

    digit = -1

  end if

  return
end
subroutine dtable_data_read ( input_filename, m, n, table )

!*****************************************************************************80
!
!! DTABLE_DATA_READ reads data from a double precision table file.
!
!  Discussion:
!
!    The file may contain more than N points, but this routine will
!    return after reading N of them.
!
!  Modified:
!
!    07 September 2004
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) INPUT_FILENAME, the name of the input file.
!
!    Input, integer M, the spatial dimension.
!
!    Input, integer N, the number of points.
!
!    Output, real ( kind = 8 ) TABLE(M,N), the table data.
!
  implicit none

  integer m
  integer n

  integer i
  integer ierror
  character ( len = * ) input_filename
  integer input_unit
  integer ios
  character ( len = 255 ) line
  real ( kind = 8 ) table(m,n)
  real ( kind = 8 ) x(m)

  call get_unit ( input_unit )

  open ( unit = input_unit, file = input_filename, status = 'old', &
    iostat = ios )

  if ( ios /= 0 ) then
    ierror = 1
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'DTABLE_DATA_READ - Fatal error!'
    write ( *, '(a)' ) '  Could not open the input file: ' // &
      trim ( input_filename )
    stop
  end if

  i = 0

  do while ( i < n )

    read ( input_unit, '(a)', iostat = ios ) line

    if ( ios /= 0 ) then
      ierror = i
      exit
    end if

    if ( line(1:1) == '#' .or. len_trim ( line ) == 0 ) then
      cycle
    end if

    call s_to_r8vec ( line, m, x, ierror )

    if ( ierror /= 0 ) then
      cycle
    end if

    i = i + 1

    table(1:m,i) = x(1:m)

  end do

  close ( unit = input_unit )

  return
end
subroutine dtable_header_read ( input_filename, m, n )

!*****************************************************************************80
!
!! DTABLE_HEADER_READ reads the header from a double precision table file.
!
!  Modified:
!
!    07 September 2004
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) INPUT_FILENAME, the name of the input file.
!
!    Output, integer M, spatial dimension.
!
!    Output, integer N, the number of points. 
!
  implicit none

  character ( len = * ) input_filename
  integer m
  integer n

  call file_column_count ( input_filename, m )

  if ( m <= 0 ) then
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'DTABLE_HEADER_READ - Fatal error!'
    write ( *, '(a)' ) '  There was some kind of I/O problem while trying'
    write ( *, '(a)' ) '  to count the number of data columns in'
    write ( *, '(a)' ) '  the file "' // trim ( input_filename ) // '".'
    stop
  end if

  call file_row_count ( input_filename, n )

  if ( n <= 0 ) then
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'DTABLE_HEADER_READ - Fatal error!'
    write ( *, '(a)' ) '  There was some kind of I/O problem while trying'
    write ( *, '(a)' ) '  to count the number of data rows in'
    write ( *, '(a)' ) '  the file "' // trim ( input_filename ) // '".'
    stop
  end if

  return
end
subroutine file_column_count ( input_filename, column_num )

!*****************************************************************************80
!
!! FILE_COLUMN_COUNT counts the number of columns in the first line of a file.
!
!  Discussion:
!
!    The file is assumed to be a simple text file.
!
!    Most lines of the file is presumed to consist of COLUMN_NUM words,
!    separated by spaces.  There may also be some blank lines, and some 
!    comment lines,
!    which have a "#" in column 1.
!
!    The routine tries to find the first non-comment non-blank line and
!    counts the number of words in that line.
!
!    If all lines are blanks or comments, it goes back and tries to analyze
!    a comment line.
!
!  Modified:
!
!    21 June 2001
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) INPUT_FILENAME, the name of the file.
!
!    Output, integer COLUMN_NUM, the number of columns in the file.
!
  implicit none

  integer column_num
  logical got_one
  character ( len = * ) input_filename
  integer input_unit
  integer ios
  character ( len = 256 ) line
!
!  Open the file.
!
  call get_unit ( input_unit )

  open ( unit = input_unit, file = input_filename, status = 'old', &
    form = 'formatted', access = 'sequential', iostat = ios )

  if ( ios /= 0 ) then
    column_num = -1
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'FILE_COLUMN_COUNT - Fatal error!'
    write ( *, '(a)' ) '  Could not open the file:'
    write ( *, '(a)' ) '    ' // trim ( input_filename )
    return
  end if
!
!  Read one line, but skip blank lines and comment lines.
!
  got_one = .false.

  do

    read ( input_unit, '(a)', iostat = ios ) line

    if ( ios /= 0 ) then
      exit
    end if

    if ( len_trim ( line ) == 0 ) then
      cycle
    end if

    if ( line(1:1) == '#' ) then
      cycle
    end if

    got_one = .true.
    exit

  end do

  if ( .not. got_one ) then

    rewind ( input_unit )

    do

      read ( input_unit, '(a)', iostat = ios ) line

      if ( ios /= 0 ) then
        exit
      end if

      if ( len_trim ( line ) == 0 ) then
        cycle
      end if

      got_one = .true.
      exit

    end do

  end if

  close ( unit = input_unit )

  if ( .not. got_one ) then
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'FILE_COLUMN_COUNT - Warning!'
    write ( *, '(a)' ) '  The file does not seem to contain any data.'
    column_num = -1
    return
  end if

  call s_word_count ( line, column_num )

  return
end
subroutine file_name_ext_get ( file_name, i, j )

!*****************************************************************************80
!
!! FILE_NAME_EXT_GET determines the "extension" of a file name.
!
!  Definition:
!
!    The "extension" of a filename is the string of characters
!    that appears after the LAST period in the name.  A file
!    with no period, or with a period as the last character
!    in the name, has a "null" extension.
!
!  Note:
!
!    Blanks are unusual in filenames.  This routine ignores all
!    trailing blanks, but will treat initial or internal blanks
!    as regular characters acceptable in a file name.
!
!  Examples:
!
!    FILE_NAME   I  J
!
!    bob.for     4  7
!    N.B.C.D     6  7
!    Naomi.      6  6
!    Arthur      0  0
!    .com        1  1
!
!  Modified:
!
!    17 July 1998
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) FILE_NAME, a file name to be examined.
!
!    Output, integer I, J, the indices of the first and last characters
!    in the file extension.
!
!    If no period occurs in FILE_NAME, then
!      I = J = 0;
!    Otherwise,
!      I is the position of the LAST period in FILE_NAME, and J is the
!      position of the last nonblank character following the period.
!
  implicit none

  character ( len = * ) file_name
  integer i
  integer j
  integer s_index_last

  i = s_index_last ( file_name, '.' )

  if ( i /= 0 ) then

    j = len_trim ( file_name )

  else

    j = 0

  end if

  return
end
subroutine file_name_ext_swap ( file_name, ext )

!*****************************************************************************80
!
!! FILE_NAME_EXT_SWAP replaces the current "extension" of a file name.
!
!  Definition:
!
!    The "extension" of a filename is the string of characters
!    that appears after the LAST period in the name.  A file
!    with no period, or with a period as the last character
!    in the name, has a "null" extension.
!
!  Examples:
!
!          Input           Output
!    ================     =========
!    FILE_NAME    EXT     FILE_NAME
!
!    bob.for      obj     bob.obj
!    bob.bob.bob  txt     bob.bob.txt
!    bob          yak     bob.yak
!
!  Modified:
!
!    09 August 1999
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input/output, character ( len = * ) FILE_NAME, a file name.
!    On output, the extension of the file has been changed.
!
!    Input, character ( len = * ) EXT, the extension to be used on the output
!    copy of FILE_NAME, replacing the current extension if any.
!
  implicit none

  character ( len = * ) ext
  character ( len = * ) file_name
  integer i
  integer j
  integer len_max
  integer len_name

  len_max = len ( file_name )
  len_name = len_trim ( file_name )

  call file_name_ext_get ( file_name, i, j )

  if ( i == 0 ) then

    if ( len_max < len_name + 1 ) then
      return
    end if

    len_name = len_name + 1
    file_name(len_name:len_name) = '.'
    i = len_name + 1

  else

    i = i + 1
    file_name(i:j) = ' '

  end if

  file_name(i:) = ext

  return
end
subroutine file_row_count ( input_filename, row_num )

!*****************************************************************************80
!
!! FILE_ROW_COUNT counts the number of row records in a file.
!
!  Discussion:
!
!    It does not count lines that are blank, or that begin with a
!    comment symbol '#'.
!
!  Modified:
!
!    06 March 2003
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) INPUT_FILENAME, the name of the input file.
!
!    Output, integer ROW_NUM, the number of rows found.
!
  implicit none

  integer bad_num
  integer comment_num
  integer ierror
  character ( len = * ) input_filename
  integer input_unit
  integer ios
  character ( len = 100 ) line
  integer record_num
  integer row_num

  call get_unit ( input_unit )

  open ( unit = input_unit, file = input_filename, status = 'old', &
    iostat = ios )

  if ( ios /= 0 ) then
    row_num = -1;
    ierror = 1
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'FILE_ROW_COUNT - Fatal error!'
    write ( *, '(a)' ) '  Could not open the input file: ' // &
      trim ( input_filename )
    stop
  end if

  comment_num = 0
  row_num = 0
  record_num = 0
  bad_num = 0

  do

    read ( input_unit, '(a)', iostat = ios ) line

    if ( ios /= 0 ) then
      ierror = record_num
      exit
    end if

    record_num = record_num + 1

    if ( line(1:1) == '#' ) then
      comment_num = comment_num + 1
      cycle
    end if

    if ( len_trim ( line ) == 0 ) then
      comment_num = comment_num + 1
      cycle
    end if

    row_num = row_num + 1

  end do

  close ( unit = input_unit )

  return
end
subroutine get_unit ( iunit )

!*****************************************************************************80
!
!! GET_UNIT returns a free FORTRAN unit number.
!
!  Discussion:
!
!    A "free" FORTRAN unit number is an integer between 1 and 99 which
!    is not currently associated with an I/O device.  A free FORTRAN unit
!    number is needed in order to open a file with the OPEN command.
!
!    If IUNIT = 0, then no free FORTRAN unit could be found, although
!    all 99 units were checked (except for units 5, 6 and 9, which
!    are commonly reserved for console I/O).
!
!    Otherwise, IUNIT is an integer between 1 and 99, representing a
!    free FORTRAN unit.  Note that GET_UNIT assumes that units 5 and 6
!    are special, and will never return those values.
!
!  Modified:
!
!    18 September 2005
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Output, integer IUNIT, the free unit number.
!
  implicit none

  integer i
  integer ios
  integer iunit
  logical lopen

  iunit = 0

  do i = 1, 99

    if ( i /= 5 .and. i /= 6 .and. i /= 9 ) then

      inquire ( unit = i, opened = lopen, iostat = ios )

      if ( ios == 0 ) then
        if ( .not. lopen ) then
          iunit = i
          return
        end if
      end if

    end if

  end do

  return
end
function i4_modp ( i, j )

!*****************************************************************************80
!
!! I4_MODP returns the nonnegative remainder of I4 division.
!
!  Formula:
!
!    If
!      NREM = I4_MODP ( I, J )
!      NMULT = ( I - NREM ) / J
!    then
!      I = J * NMULT + NREM
!    where NREM is always nonnegative.
!
!  Comments:
!
!    The MOD function computes a result with the same sign as the
!    quantity being divided.  Thus, suppose you had an angle A,
!    and you wanted to ensure that it was between 0 and 360.
!    Then mod(A,360) would do, if A was positive, but if A
!    was negative, your result would be between -360 and 0.
!
!    On the other hand, I4_MODP(A,360) is between 0 and 360, always.
!
!  Examples:
!
!        I     J     MOD  I4_MODP    Factorization
!
!      107    50       7       7    107 =  2 *  50 + 7
!      107   -50       7       7    107 = -2 * -50 + 7
!     -107    50      -7      43   -107 = -3 *  50 + 43
!     -107   -50      -7      43   -107 =  3 * -50 + 43
!
!  Modified:
!
!    02 March 1999
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, integer I, the number to be divided.
!
!    Input, integer J, the number that divides I.
!
!    Output, integer I4_MODP, the nonnegative remainder when I is
!    divided by J.
!
  implicit none

  integer i
  integer i4_modp
  integer j

  if ( j == 0 ) then
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'I4_MODP - Fatal error!'
    write ( *, '(a,i8)' ) '  I4_MODP ( I, J ) called with J = ', j
    stop
  end if

  i4_modp = mod ( i, j )

  if ( i4_modp < 0 ) then
    i4_modp = i4_modp + abs ( j )
  end if

  return
end
function i4_wrap ( ival, ilo, ihi )

!*****************************************************************************80
!
!! I4_WRAP forces an I4 to lie between given limits by wrapping.
!
!  Example:
!
!    ILO = 4, IHI = 8
!
!    I  I4_WRAP
!
!    -2     8
!    -1     4
!     0     5
!     1     6
!     2     7
!     3     8
!     4     4
!     5     5
!     6     6
!     7     7
!     8     8
!     9     4
!    10     5
!    11     6
!    12     7
!    13     8
!    14     4
!
!  Modified:
!
!    15 July 2000
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, integer IVAL, an integer value.
!
!    Input, integer ILO, IHI, the desired bounds for the integer value.
!
!    Output, integer I4_WRAP, a "wrapped" version of IVAL.
!
  implicit none

  integer i4_modp
  integer i4_wrap
  integer ihi
  integer ilo
  integer ival
  integer wide

  wide = ihi + 1 - ilo

  if ( wide == 0 ) then
    i4_wrap = ilo
  else
    i4_wrap = ilo + i4_modp ( ival-ilo, wide )
  end if

  return
end
subroutine i4mat_transpose_print_some ( m, n, a, ilo, jlo, ihi, jhi, title )

!*****************************************************************************80
!
!! I4MAT_TRANSPOSE_PRINT_SOME prints some of the transpose of an I4MAT.
!
!  Discussion:
!
!    An I4MAT is a rectangular array of integer values.
!
!  Modified:
!
!    09 February 2005
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, integer M, N, the number of rows and columns.
!
!    Input, integer A(M,N), an M by N matrix to be printed.
!
!    Input, integer ILO, JLO, the first row and column to print.
!
!    Input, integer IHI, JHI, the last row and column to print.
!
!    Input, character ( len = * ) TITLE, an optional title.
!
  implicit none

  integer, parameter :: incx = 10
  integer m
  integer n

  integer a(m,n)
  character ( len = 8 ) ctemp(incx)
  integer i
  integer i2
  integer i2hi
  integer i2lo
  integer ihi
  integer ilo
  integer inc
  integer j
  integer j2hi
  integer j2lo
  integer jhi
  integer jlo
  character ( len = * ) title

  if ( 0 < len_trim ( title ) ) then
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) trim ( title )
  end if

  do i2lo = max ( ilo, 1 ), min ( ihi, m ), incx

    i2hi = i2lo + incx - 1
    i2hi = min ( i2hi, m )
    i2hi = min ( i2hi, ihi )

    inc = i2hi + 1 - i2lo

    write ( *, '(a)' ) ' '

    do i = i2lo, i2hi
      i2 = i + 1 - i2lo
      write ( ctemp(i2), '(i8)' ) i
    end do

    write ( *, '(''  Row '',10a8)' ) ctemp(1:inc)
    write ( *, '(a)' ) '  Col'
    write ( *, '(a)' ) ' '

    j2lo = max ( jlo, 1 )
    j2hi = min ( jhi, n )

    do j = j2lo, j2hi

      do i2 = 1, inc

        i = i2lo - 1 + i2

        write ( ctemp(i2), '(i8)' ) a(i,j)

      end do

      write ( *, '(i5,1x,10a8)' ) j, ( ctemp(i), i = 1, inc )

    end do

  end do

  write ( *, '(a)' ) ' '

  return
end
subroutine itable_data_read ( input_filename, m, n, table )

!*****************************************************************************80
!
!! ITABLE_DATA_READ reads data from an integer table file.
!
!  Discussion:
!
!    The file may contain more than N points, but this routine
!    will return after reading N points.
!
!  Modified:
!
!    08 October 2003
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) INPUT_FILENAME, the name of the input file.
!
!    Input, integer M, the spatial dimension.
!
!    Input, integer N, the number of points.  
!
!    Output, integer TABLE(M,N), the table data.
!
  implicit none

  integer m
  integer n

  integer i
  integer ierror
  character ( len = * ) input_filename
  integer input_unit
  integer ios
  character ( len = 255 ) line
  integer table(m,n)
  integer x(m)

  call get_unit ( input_unit )

  open ( unit = input_unit, file = input_filename, status = 'old', &
    iostat = ios )

  if ( ios /= 0 ) then
    ierror = 1
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'ITABLE_DATA_READ - Fatal error!'
    write ( *, '(a)' ) '  Could not open the input file: ' // &
      trim ( input_filename )
    stop
  end if

  i = 0

  do while ( i < n )

    read ( input_unit, '(a)', iostat = ios ) line

    if ( ios /= 0 ) then
      ierror = i
      exit
    end if

    if ( line(1:1) == '#' .or. len_trim ( line ) == 0 ) then
      cycle
    end if

    call s_to_i4vec ( line, m, x, ierror )

    if ( ierror /= 0 ) then
      cycle
    end if

    i = i + 1

    table(1:m,i) = x(1:m)

  end do

  close ( unit = input_unit )

  return
end
subroutine itable_header_read ( input_filename, m, n )

!*****************************************************************************80
!
!! ITABLE_HEADER_READ reads the header from an integer table file.
!
!  Modified:
!
!    04 June 2004
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) INPUT_FILENAME, the name of the input file.
!
!    Output, integer M, spatial dimension.
!
!    Output, integer N, the number of points. 
!
  implicit none

  character ( len = * ) input_filename
  integer m
  integer n

  call file_column_count ( input_filename, m )

  if ( m <= 0 ) then
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'ITABLE_HEADER_READ - Fatal error!'
    write ( *, '(a)' ) '  There was some kind of I/O problem while trying'
    write ( *, '(a)' ) '  to count the number of data columns in'
    write ( *, '(a)' ) '  the file "' // trim ( input_filename ) // '".'
    stop
  end if

  call file_row_count ( input_filename, n )

  if ( n <= 0 ) then
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'ITABLE_HEADER_READ - Fatal error!'
    write ( *, '(a)' ) '  There was some kind of I/O problem while trying'
    write ( *, '(a)' ) '  to count the number of data rows in'
    write ( *, '(a)' ) '  the file "' // trim ( input_filename ) // '".'
    stop
  end if

  return
end
subroutine r8mat_transpose_print_some ( m, n, a, ilo, jlo, ihi, jhi, title )

!*****************************************************************************80
!
!! R8MAT_TRANSPOSE_PRINT_SOME prints some of an R8MAT, transposed.
!
!  Discussion:
!
!    An R8MAT is a two dimensional matrix of double precision real values.
!
!  Modified:
!
!    14 June 2004
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, integer M, N, the number of rows and columns.
!
!    Input, real ( kind = 8 ) A(M,N), an M by N matrix to be printed.
!
!    Input, integer ILO, JLO, the first row and column to print.
!
!    Input, integer IHI, JHI, the last row and column to print.
!
!    Input, character ( len = * ) TITLE, an optional title.
!
  implicit none

  integer, parameter :: incx = 5
  integer m
  integer n

  real ( kind = 8 ) a(m,n)
  character ( len = 14 ) ctemp(incx)
  integer i
  integer i2
  integer i2hi
  integer i2lo
  integer ihi
  integer ilo
  integer inc
  integer j
  integer j2hi
  integer j2lo
  integer jhi
  integer jlo
  character ( len = * ) title

  if ( 0 < len_trim ( title ) ) then
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) trim ( title )
  end if

  do i2lo = max ( ilo, 1 ), min ( ihi, m ), incx

    i2hi = i2lo + incx - 1
    i2hi = min ( i2hi, m )
    i2hi = min ( i2hi, ihi )

    inc = i2hi + 1 - i2lo

    write ( *, '(a)' ) ' '

    do i = i2lo, i2hi
      i2 = i + 1 - i2lo
      write ( ctemp(i2), '(i8,6x)' ) i
    end do

    write ( *, '(''  Row   '',5a14)' ) ctemp(1:inc)
    write ( *, '(a)' ) '  Col'
    write ( *, '(a)' ) ' '

    j2lo = max ( jlo, 1 )
    j2hi = min ( jhi, n )

    do j = j2lo, j2hi

      do i2 = 1, inc
        i = i2lo - 1 + i2
        write ( ctemp(i2), '(g14.6)' ) a(i,j)
      end do

      write ( *, '(i5,1x,5a14)' ) j, ( ctemp(i), i = 1, inc )

    end do

  end do

  write ( *, '(a)' ) ' '

  return
end
function s_index_last ( s, sub )

!*****************************************************************************80
!
!! S_INDEX_LAST finds the LAST occurrence of a given substring.
!
!  Discussion:
!
!    It returns the location in the string at which the substring SUB is
!    first found, or 0 if the substring does not occur at all.
!
!    The routine is also trailing blank insensitive.  This is very
!    important for those cases where you have stored information in
!    larger variables.  If S is of length 80, and SUB is of
!    length 80, then if S = 'FRED' and SUB = 'RED', a match would
!    not be reported by the standard FORTRAN INDEX, because it treats
!    both variables as being 80 characters long!  This routine assumes that
!    trailing blanks represent garbage!
!
!    This means that this routine cannot be used to find, say, the last
!    occurrence of a substring 'A ', since it assumes the blank space
!    was not specified by the user, but is, rather, padding by the
!    system.  However, as a special case, this routine can properly handle
!    the case where either S or SUB is all blanks.
!
!  Modified:
!
!    14 April 1999
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) S, the string to be searched.
!
!    Input, character ( len = * ) SUB, the substring to search for.
!
!    Output, integer S_INDEX_LAST.  0 if SUB does not occur in
!    the string.  Otherwise S_INDEX_LAST = I, where S(I:I+LENS-1) = SUB,
!    where LENS is the length of SUB, and is the last place
!    this happens.
!
  implicit none

  integer i
  integer j
  integer llen1
  integer llen2
  character ( len = * ) s
  integer s_index_last
  character ( len = * ) sub

  s_index_last = 0

  llen1 = len_trim ( s )
  llen2 = len_trim ( sub )
!
!  In case S or SUB is blanks, use LEN
!
  if ( llen1 == 0 ) then
    llen1 = len ( s )
  end if

  if ( llen2 == 0 ) then
    llen2 = len ( sub )
  end if

  if ( llen1 < llen2 ) then
    return
  end if

  do j = 1, llen1+1-llen2

    i = llen1 + 2 - llen2 - j

    if ( s(i:i+llen2-1) == sub ) then
      s_index_last = i
      return
    end if

  end do

  return
end
subroutine s_to_i4 ( s, ival, ierror, length )

!*****************************************************************************80
!
!! S_TO_I4 reads an I4 from a string.
!
!  Modified:
!
!    28 June 2000
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) S, a string to be examined.
!
!    Output, integer IVAL, the integer value read from the string.
!    If the string is blank, then IVAL will be returned 0.
!
!    Output, integer IERROR, an error flag.
!    0, no error.
!    1, an error occurred.
!
!    Output, integer LENGTH, the number of characters of S used to make IVAL.
!
  implicit none

  character c
  integer i
  integer ierror
  integer isgn
  integer istate
  integer ival
  integer length
  character ( len = * ) s

  ierror = 0
  istate = 0
  isgn = 1
  ival = 0

  do i = 1, len_trim ( s )

    c = s(i:i)
!
!  Haven't read anything.
!
    if ( istate == 0 ) then

      if ( c == ' ' ) then

      else if ( c == '-' ) then
        istate = 1
        isgn = -1
      else if ( c == '+' ) then
        istate = 1
        isgn = + 1
      else if ( lle ( '0', c ) .and. lle ( c, '9' ) ) then
        istate = 2
        ival = ichar ( c ) - ichar ( '0' )
      else
        ierror = 1
        return
      end if
!
!  Have read the sign, expecting digits.
!
    else if ( istate == 1 ) then

      if ( c == ' ' ) then

      else if ( lle ( '0', c ) .and. lle ( c, '9' ) ) then
        istate = 2
        ival = ichar ( c ) - ichar ( '0' )
      else
        ierror = 1
        return
      end if
!
!  Have read at least one digit, expecting more.
!
    else if ( istate == 2 ) then

      if ( lle ( '0', c ) .and. lle ( c, '9' ) ) then
        ival = 10 * ival + ichar ( c ) - ichar ( '0' )
      else
        ival = isgn * ival
        length = i - 1
        return
      end if

    end if

  end do
!
!  If we read all the characters in the string, see if we're OK.
!
  if ( istate == 2 ) then
    ival = isgn * ival
    length = len_trim ( s )
  else
    ierror = 1
    length = 0
  end if

  return
end
subroutine s_to_i4vec ( s, n, ivec, ierror )

!*****************************************************************************80
!
!! S_TO_I4VEC reads an I4VEC from a string.
!
!  Modified:
!
!    08 October 2003
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) S, the string to be read.
!
!    Input, integer N, the number of values expected.
!
!    Output, integer IVEC(N), the values read from the string.
!
!    Output, integer IERROR, error flag.
!    0, no errors occurred.
!    -K, could not read data for entries -K through N.
!
  implicit none

  integer n

  integer i
  integer ierror
  integer ilo
  integer ivec(n)
  integer length
  character ( len = * ) s

  i = 0

  ilo = 1

  do while ( i < n )

    i = i + 1

    call s_to_i4 ( s(ilo:), ivec(i), ierror, length )

    if ( ierror /= 0 ) then
      ierror = -i
      exit
    end if

    ilo = ilo + length

  end do

  return
end
subroutine s_to_r8 ( s, dval, ierror, length )

!*****************************************************************************80
!
!! S_TO_R8 reads an R8 from a string.
!
!  Discussion:
!
!    The routine will read as many characters as possible until it reaches
!    the end of the string, or encounters a character which cannot be
!    part of the number.
!
!    Legal input is:
!
!       1 blanks,
!       2 '+' or '-' sign,
!       2.5 blanks
!       3 integer part,
!       4 decimal point,
!       5 fraction part,
!       6 'E' or 'e' or 'D' or 'd', exponent marker,
!       7 exponent sign,
!       8 exponent integer part,
!       9 exponent decimal point,
!      10 exponent fraction part,
!      11 blanks,
!      12 final comma or semicolon,
!
!    with most quantities optional.
!
!  Examples:
!
!    S                 DVAL
!
!    '1'               1.0
!    '     1   '       1.0
!    '1A'              1.0
!    '12,34,56'        12.0
!    '  34 7'          34.0
!    '-1E2ABCD'        -100.0
!    '-1X2ABCD'        -1.0
!    ' 2E-1'           0.2
!    '23.45'           23.45
!    '-4.2E+2'         -420.0
!    '17d2'            1700.0
!    '-14e-2'         -0.14
!    'e2'              100.0
!    '-12.73e-9.23'   -12.73 * 10.0**(-9.23)
!
!  Modified:
!
!    07 September 2004
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) S, the string containing the
!    data to be read.  Reading will begin at position 1 and
!    terminate at the end of the string, or when no more
!    characters can be read to form a legal real.  Blanks,
!    commas, or other nonnumeric data will, in particular,
!    cause the conversion to halt.
!
!    Output, real ( kind = 8 ) DVAL, the value read from the string.
!
!    Output, integer IERROR, error flag.
!    0, no errors occurred.
!    1, 2, 6 or 7, the input number was garbled.  The
!    value of IERROR is the last type of input successfully
!    read.  For instance, 1 means initial blanks, 2 means
!    a plus or minus sign, and so on.
!
!    Output, integer LENGTH, the number of characters read
!    to form the number, including any terminating
!    characters such as a trailing comma or blanks.
!
  implicit none

  logical ch_eqi
  character c
  real ( kind = 8 ) dval
  integer ierror
  integer ihave
  integer isgn
  integer iterm
  integer jbot
  integer jsgn
  integer jtop
  integer length
  integer nchar
  integer ndig
  real ( kind = 8 ) rbot
  real ( kind = 8 ) rexp
  real ( kind = 8 ) rtop
  character ( len = * ) s

  nchar = len_trim ( s )

  ierror = 0
  dval = 0.0D+00
  length = -1
  isgn = 1
  rtop = 0
  rbot = 1
  jsgn = 1
  jtop = 0
  jbot = 1
  ihave = 1
  iterm = 0

  do

    length = length + 1

    if ( nchar < length+1 ) then
      exit
    end if

    c = s(length+1:length+1)
!
!  Blank character.
!
    if ( c == ' ' ) then

      if ( ihave == 2 ) then

      else if ( ihave == 6 .or. ihave == 7 ) then
        iterm = 1
      else if ( 1 < ihave ) then
        ihave = 11
      end if
!
!  Comma.
!
    else if ( c == ',' .or. c == ';' ) then

      if ( ihave /= 1 ) then
        iterm = 1
        ihave = 12
        length = length + 1
      end if
!
!  Minus sign.
!
    else if ( c == '-' ) then

      if ( ihave == 1 ) then
        ihave = 2
        isgn = -1
      else if ( ihave == 6 ) then
        ihave = 7
        jsgn = -1
      else
        iterm = 1
      end if
!
!  Plus sign.
!
    else if ( c == '+' ) then

      if ( ihave == 1 ) then
        ihave = 2
      else if ( ihave == 6 ) then
        ihave = 7
      else
        iterm = 1
      end if
!
!  Decimal point.
!
    else if ( c == '.' ) then

      if ( ihave < 4 ) then
        ihave = 4
      else if ( 6 <= ihave .and. ihave <= 8 ) then
        ihave = 9
      else
        iterm = 1
      end if
!
!  Scientific notation exponent marker.
!
    else if ( ch_eqi ( c, 'E' ) .or. ch_eqi ( c, 'D' ) ) then

      if ( ihave < 6 ) then
        ihave = 6
      else
        iterm = 1
      end if
!
!  Digit.
!
    else if (  ihave < 11 .and. lle ( '0', c ) .and. lle ( c, '9' ) ) then

      if ( ihave <= 2 ) then
        ihave = 3
      else if ( ihave == 4 ) then
        ihave = 5
      else if ( ihave == 6 .or. ihave == 7 ) then
        ihave = 8
      else if ( ihave == 9 ) then
        ihave = 10
      end if

      call ch_to_digit ( c, ndig )

      if ( ihave == 3 ) then
        rtop = 10.0D+00 * rtop + real ( ndig, kind = 8 )
      else if ( ihave == 5 ) then
        rtop = 10.0D+00 * rtop + real ( ndig, kind = 8 )
        rbot = 10.0D+00 * rbot
      else if ( ihave == 8 ) then
        jtop = 10 * jtop + ndig
      else if ( ihave == 10 ) then
        jtop = 10 * jtop + ndig
        jbot = 10 * jbot
      end if
!
!  Anything else is regarded as a terminator.
!
    else
      iterm = 1
    end if
!
!  If we haven't seen a terminator, and we haven't examined the
!  entire string, go get the next character.
!
    if ( iterm == 1 ) then
      exit
    end if

  end do
!
!  If we haven't seen a terminator, and we have examined the
!  entire string, then we're done, and LENGTH is equal to NCHAR.
!
  if ( iterm /= 1 .and. length+1 == nchar ) then
    length = nchar
  end if
!
!  Number seems to have terminated.  Have we got a legal number?
!  Not if we terminated in states 1, 2, 6 or 7!
!
  if ( ihave == 1 .or. ihave == 2 .or. ihave == 6 .or. ihave == 7 ) then
    ierror = ihave
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'S_TO_R8 - Serious error!'
    write ( *, '(a)' ) '  Illegal or nonnumeric input:'
    write ( *, '(a)' ) '    ' // trim ( s )
    return
  end if
!
!  Number seems OK.  Form it.
!
  if ( jtop == 0 ) then
    rexp = 1.0D+00
  else
    if ( jbot == 1 ) then
      rexp = 10.0D+00 ** ( jsgn * jtop )
    else
      rexp = 10.0D+00 ** ( real ( jsgn * jtop, kind = 8 ) &
        / real ( jbot, kind = 8 ) )
    end if
  end if

  dval = real ( isgn, kind = 8 ) * rexp * rtop / rbot

  return
end
subroutine s_to_r8vec ( s, n, rvec, ierror )

!*****************************************************************************80
!
!! S_TO_R8VEC reads an R8VEC from a string.
!
!  Modified:
!
!    07 September 2004
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) S, the string to be read.
!
!    Input, integer N, the number of values expected.
!
!    Output, real ( kind = 8 ) RVEC(N), the values read from the string.
!
!    Output, integer IERROR, error flag.
!    0, no errors occurred.
!    -K, could not read data for entries -K through N.
!
  implicit none

  integer n

  integer i
  integer ierror
  integer ilo
  integer lchar
  real ( kind = 8 ) rvec(n)
  character ( len = * ) s

  i = 0

  ilo = 1

  do while ( i < n )

    i = i + 1

    call s_to_r8 ( s(ilo:), rvec(i), ierror, lchar )

    if ( ierror /= 0 ) then
      ierror = -i
      exit
    end if

    ilo = ilo + lchar

  end do

  return
end
subroutine s_word_count ( s, nword )

!*****************************************************************************80
!
!! S_WORD_COUNT counts the number of "words" in a string.
!
!  Modified:
!
!    14 April 1999
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) S, the string to be examined.
!
!    Output, integer NWORD, the number of "words" in the string.
!    Words are presumed to be separated by one or more blanks.
!
  implicit none

  logical blank
  integer i
  integer lens
  integer nword
  character ( len = * ) s

  nword = 0
  lens = len ( s )

  if ( lens <= 0 ) then
    return
  end if

  blank = .true.

  do i = 1, lens

    if ( s(i:i) == ' ' ) then
      blank = .true.
    else if ( blank ) then
      nword = nword + 1
      blank = .false.
    end if

  end do

  return
end
subroutine timestamp ( )

!*****************************************************************************80
!
!! TIMESTAMP prints the current YMDHMS date as a time stamp.
!
!  Example:
!
!    May 31 2001   9:45:54.872 AM
!
!  Modified:
!
!    15 March 2003
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    None
!
  implicit none

  character ( len = 40 ) string

  call timestring ( string )

  write ( *, '(a)' ) trim ( string )

  return
end
subroutine timestring ( string )

!*****************************************************************************80
!
!! TIMESTRING writes the current YMDHMS date into a string.
!
!  Example:
!
!    STRING = 'May 31 2001   9:45:54.872 AM'
!
!  Modified:
!
!    15 March 2003
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Output, character ( len = * ) STRING, contains the date information.
!    A character length of 40 should always be sufficient.
!
  implicit none

  character ( len = 8 ) ampm
  integer d
  character ( len = 8 ) date
  integer h
  integer m
  integer mm
  character ( len = 9 ), parameter, dimension(12) :: month = (/ &
    'January  ', 'February ', 'March    ', 'April    ', &
    'May      ', 'June     ', 'July     ', 'August   ', &
    'September', 'October  ', 'November ', 'December ' /)
  integer n
  integer s
  character ( len = * ) string
  character ( len = 10 ) time
  integer values(8)
  integer y
  character ( len = 5 ) zone

  call date_and_time ( date, time, zone, values )

  y = values(1)
  m = values(2)
  d = values(3)
  h = values(5)
  n = values(6)
  s = values(7)
  mm = values(8)

  if ( h < 12 ) then
    ampm = 'AM'
  else if ( h == 12 ) then
    if ( n == 0 .and. s == 0 ) then
      ampm = 'Noon'
    else
      ampm = 'PM'
    end if
  else
    h = h - 12
    if ( h < 12 ) then
      ampm = 'PM'
    else if ( h == 12 ) then
      if ( n == 0 .and. s == 0 ) then
        ampm = 'Midnight'
      else
        ampm = 'AM'
      end if
    end if
  end if

  write ( string, '(a,1x,i2,1x,i4,2x,i2,a1,i2.2,a1,i2.2,a1,i3.3,1x,a)' ) &
    trim ( month(m) ), d, y, h, ':', n, ':', s, '.', mm, trim ( ampm )

  return
end
subroutine triangulation_order3_plot ( file_name, node_num, node_xy, &
  triangle_num, triangle_node, node_show, triangle_show )

!*****************************************************************************80
!
!! TRIANGULATION_ORDER3_PLOT plots a 3-node triangulation of a pointset.
!
!  Discussion:
!
!    The triangulation is most usually a Delaunay triangulation,
!    but this is not necessary.
!
!  Modified:
!
!    26 September 2006
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) FILE_NAME, the name of the output file.
!
!    Input, integer NODE_NUM, the number of points.
!
!    Input, real ( kind = 8 ) NODE_XY(2,NODE_NUM), the nodes.
!
!    Input, integer TRIANGLE_NUM, the number of triangles.
!
!    Input, integer TRIANGLE_NODE(3,TRIANGLE_NUM), lists, for each triangle,
!    the indices of the points that form the vertices of the triangle.
!
!    Input, integer NODE_SHOW,
!    0, do not show nodes;
!    1, show nodes;
!    2, show nodes and label them.
!
!    Input, integer TRIANGLE_SHOW,
!    0, do not show triangles;
!    1, show triangles;
!    2, show triangles and label them.
!
  implicit none

  integer node_num
  integer triangle_num

  real ( kind = 8 ) ave_x
  real ( kind = 8 ) ave_y
  character ( len = 40 ) date_time
  integer :: circle_size
  integer delta
  integer e
  character ( len = * ) file_name
  integer file_unit
  integer i
  integer i4_wrap
  integer ios
  integer node
  integer node_show
  real ( kind = 8 ) node_xy(2,node_num)
  character ( len = 40 ) string
  integer triangle
  integer triangle_node(3,triangle_num)
  integer triangle_show
  real ( kind = 8 ) x_max
  real ( kind = 8 ) x_min
  integer x_ps
  integer :: x_ps_max = 576
  integer :: x_ps_max_clip = 594
  integer :: x_ps_min = 36
  integer :: x_ps_min_clip = 18
  real ( kind = 8 ) x_scale
  real ( kind = 8 ) y_max
  real ( kind = 8 ) y_min
  integer y_ps
  integer :: y_ps_max = 666
  integer :: y_ps_max_clip = 684
  integer :: y_ps_min = 126
  integer :: y_ps_min_clip = 108
  real ( kind = 8 ) y_scale

  call timestring ( date_time )
!
!  We need to do some figuring here, so that we can determine
!  the range of the data, and hence the height and width
!  of the piece of paper.
!
  x_max = maxval ( node_xy(1,1:node_num) )
  x_min = minval ( node_xy(1,1:node_num) )
  x_scale = x_max - x_min

  x_max = x_max + 0.05D+00 * x_scale
  x_min = x_min - 0.05D+00 * x_scale
  x_scale = x_max - x_min

  y_max = maxval ( node_xy(2,1:node_num) )
  y_min = minval ( node_xy(2,1:node_num) )
  y_scale = y_max - y_min

  y_max = y_max + 0.05D+00 * y_scale
  y_min = y_min - 0.05D+00 * y_scale
  y_scale = y_max - y_min

  if ( x_scale < y_scale ) then

    delta = nint ( real ( x_ps_max - x_ps_min, kind = 8 ) &
      * ( y_scale - x_scale ) / ( 2.0D+00 * y_scale ) )

    x_ps_max = x_ps_max - delta
    x_ps_min = x_ps_min + delta

    x_ps_max_clip = x_ps_max_clip - delta
    x_ps_min_clip = x_ps_min_clip + delta

    x_scale = y_scale

  else if ( y_scale < x_scale ) then

    delta = nint ( real ( y_ps_max - y_ps_min, kind = 8 ) &
      * ( x_scale - y_scale ) / ( 2.0D+00 * x_scale ) )

    y_ps_max      = y_ps_max - delta
    y_ps_min      = y_ps_min + delta

    y_ps_max_clip = y_ps_max_clip - delta
    y_ps_min_clip = y_ps_min_clip + delta

    y_scale = x_scale

  end if

  call get_unit ( file_unit )

  open ( unit = file_unit, file = file_name, status = 'replace', &
    iostat = ios )

  if ( ios /= 0 ) then
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'TRIANGULATION_ORDER3_PLOT - Fatal error!'
    write ( *, '(a)' ) '  Can not open output file.'
    return
  end if

  write ( file_unit, '(a)' ) '%!PS-Adobe-3.0 EPSF-3.0'
  write ( file_unit, '(a)' ) '%%Creator: triangulation_order3_plot.f90'
  write ( file_unit, '(a)' ) '%%Title: ' // trim ( file_name )
  write ( file_unit, '(a)' ) '%%CreationDate: ' // trim ( date_time )
  write ( file_unit, '(a)' ) '%%Pages: 1'
  write ( file_unit, '(a,i3,2x,i3,2x,i3,2x,i3)' ) '%%BoundingBox: ', &
    x_ps_min, y_ps_min, x_ps_max, y_ps_max
  write ( file_unit, '(a)' ) '%%Document-Fonts: Times-Roman'
  write ( file_unit, '(a)' ) '%%LanguageLevel: 1'
  write ( file_unit, '(a)' ) '%%EndComments'
  write ( file_unit, '(a)' ) '%%BeginProlog'
  write ( file_unit, '(a)' ) '/inch {72 mul} def'
  write ( file_unit, '(a)' ) '%%EndProlog'
  write ( file_unit, '(a)' ) '%%Page: 1 1'
  write ( file_unit, '(a)' ) 'save'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  Set the RGB line color to very light gray.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '0.900  0.900  0.900 setrgbcolor'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  Draw a gray border around the page.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) 'newpath'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', x_ps_min, y_ps_min, ' moveto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', x_ps_max, y_ps_min, ' lineto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', x_ps_max, y_ps_max, ' lineto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', x_ps_min, y_ps_max, ' lineto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', x_ps_min, y_ps_min, ' lineto'
  write ( file_unit, '(a)' ) 'stroke'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  Set the RGB color to black.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '0.000  0.000  0.000 setrgbcolor'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  Set the font and its size.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '/Times-Roman findfont'
  write ( file_unit, '(a)' ) '0.50 inch scalefont'
  write ( file_unit, '(a)' ) 'setfont'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  Print a title.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  210  702  moveto'
  write ( file_unit, '(a)' ) '%  (Triangulation)  show'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  Define a clipping polygon.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) 'newpath'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', &
    x_ps_min_clip, y_ps_min_clip, ' moveto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', &
    x_ps_max_clip, y_ps_min_clip, ' lineto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', &
    x_ps_max_clip, y_ps_max_clip, ' lineto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', &
    x_ps_min_clip, y_ps_max_clip, ' lineto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', &
    x_ps_min_clip, y_ps_min_clip, ' lineto'
  write ( file_unit, '(a)' ) 'clip newpath'
!
!  Draw the nodes.
!
  if ( node_num <= 200 ) then
    circle_size = 5
  else if ( node_num <= 500 ) then
    circle_size = 4
  else if ( node_num <= 1000 ) then
    circle_size = 3
  else if ( node_num <= 5000 ) then
    circle_size = 2
  else
    circle_size = 1
  end if

  if ( 1 <= node_show ) then
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Draw filled dots at the nodes.'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Set the RGB color to blue.'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '0.000  0.150  0.750 setrgbcolor'
    write ( file_unit, '(a)' ) '%'

    do node = 1, node_num

      x_ps = int ( &
        ( ( x_max - node_xy(1,node)         ) * real ( x_ps_min, kind = 8 )   &
        + (         node_xy(1,node) - x_min ) * real ( x_ps_max, kind = 8 ) ) &
        / ( x_max                   - x_min ) )

      y_ps = int ( &
        ( ( y_max - node_xy(2,node)         ) * real ( y_ps_min, kind = 8 )   &
        + (         node_xy(2,node) - y_min ) * real ( y_ps_max, kind = 8 ) ) &
        / ( y_max                   - y_min ) )

      write ( file_unit, '(a,i4,2x,i4,2x,i4,2x,a)' ) 'newpath ', x_ps, y_ps, &
        circle_size, '0 360 arc closepath fill'

    end do

  end if
!
!  Label the nodes.
!
  if ( 2 <= node_show ) then

    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Label the nodes:'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Set the RGB color to darker blue.'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '0.000  0.250  0.850 setrgbcolor'
    write ( file_unit, '(a)' ) '/Times-Roman findfont'
    write ( file_unit, '(a)' ) '0.20 inch scalefont'
    write ( file_unit, '(a)' ) 'setfont'
    write ( file_unit, '(a)' ) '%'

    do node = 1, node_num

      x_ps = int ( &
        ( ( x_max - node_xy(1,node)         ) * real ( x_ps_min, kind = 8 )   &
        + (       + node_xy(1,node) - x_min ) * real ( x_ps_max, kind = 8 ) ) &
        / ( x_max                   - x_min ) )

      y_ps = int ( &
        ( ( y_max - node_xy(2,node)         ) * real ( y_ps_min, kind = 8 )   &
        + (         node_xy(2,node) - y_min ) * real ( y_ps_max, kind = 8 ) ) &
        / ( y_max                   - y_min ) )

      write ( string, '(i4)' ) node
      string = adjustl ( string )

      write ( file_unit, '(i4,2x,i4,a)' ) x_ps, y_ps+5, &
        ' moveto (' // trim ( string ) // ') show'

    end do

  end if
!
!  Draw the triangles.
!
  if ( 1 <= triangle_show ) then
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Set the RGB color to red.'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '0.900  0.200  0.100 setrgbcolor'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Draw the triangles.'
    write ( file_unit, '(a)' ) '%'

    do triangle = 1, triangle_num

      write ( file_unit, '(a)' ) 'newpath'

      do i = 1, 4

        e = i4_wrap ( i, 1, 3 )

        node = triangle_node(e,triangle)

        x_ps = int ( &
          ( ( x_max - node_xy(1,node)         ) * real ( x_ps_min, kind = 8 )   &
          + (         node_xy(1,node) - x_min ) * real ( x_ps_max, kind = 8 ) ) &
          / ( x_max                   - x_min ) )

        y_ps = int ( &
          ( ( y_max - node_xy(2,node)         ) * real ( y_ps_min, kind = 8 )   &
          + (         node_xy(2,node) - y_min ) * real ( y_ps_max, kind = 8 ) ) &
          / ( y_max                   - y_min ) )

        if ( i == 1 ) then
          write ( file_unit, '(i3,2x,i3,2x,a)' ) x_ps, y_ps, ' moveto'
        else
          write ( file_unit, '(i3,2x,i3,2x,a)' ) x_ps, y_ps, ' lineto'
        end if

      end do

      write ( file_unit, '(a)' ) 'stroke'

    end do

  end if
!
!  Label the triangles.
!
  if ( 2 <= triangle_show ) then

    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Label the triangles:'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Set the RGB color to darker red.'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '0.950  0.250  0.150 setrgbcolor'
    write ( file_unit, '(a)' ) '/Times-Roman findfont'
    write ( file_unit, '(a)' ) '0.20 inch scalefont'
    write ( file_unit, '(a)' ) 'setfont'
    write ( file_unit, '(a)' ) '%'

    do triangle = 1, triangle_num

      ave_x = 0.0D+00
      ave_y = 0.0D+00

      do i = 1, 3

        node = triangle_node(i,triangle)

        ave_x = ave_x + node_xy(1,node)
        ave_y = ave_y + node_xy(2,node)

      end do

      ave_x = ave_x / 3.0D+00
      ave_y = ave_y / 3.0D+00

      x_ps = int ( &
        ( ( x_max - ave_x         ) * real ( x_ps_min, kind = 8 )   &
        + (       + ave_x - x_min ) * real ( x_ps_max, kind = 8 ) ) &
        / ( x_max         - x_min ) )

      y_ps = int ( &
        ( ( y_max - ave_y         ) * real ( y_ps_min, kind = 8 )   &
        + (         ave_y - y_min ) * real ( y_ps_max, kind = 8 ) ) &
        / ( y_max         - y_min ) )

      write ( string, '(i4)' ) triangle
      string = adjustl ( string )

      write ( file_unit, '(i4,2x,i4,a)' ) x_ps, y_ps, ' moveto (' &
        // trim ( string ) // ') show'

    end do

  end if

  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) 'restore  showpage'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  End of page.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%%Trailer'
  write ( file_unit, '(a)' ) '%%EOF'
  close ( unit = file_unit )

  return
end
subroutine triangulation_order6_plot ( file_name, node_num, node_xy, triangle_num, &
  triangle_node, node_show, triangle_show )

!*****************************************************************************80
!
!! TRIANGULATION_ORDER6_PLOT plots a 6-node triangulation of a pointset.
!
!  Discussion:
!
!    The triangulation is most usually a Delaunay triangulation,
!    but this is not necessary.
!
!    In a six node triangulation, it is assumed that nodes 1, 2, and 3
!    are the vertices of the triangles, and that nodes 4, 5, and 6
!    lie between 1 and 2, 2 and 3, and 3 and 1 respectively.
!
!  Modified:
!
!    26 September 2006
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, character ( len = * ) FILE_NAME, the name of the output file.
!
!    Input, integer NODE_NUM, the number of points.
!
!    Input, real ( kind = 8 ) NODE_XY(2,NODE_NUM), the nodes.
!
!    Input, integer TRIANGLE_NUM, the number of triangles.
!
!    Input, integer TRIANGLE_NODE(6,TRIANGLE_NUM), lists, for each triangle,
!    the indices of the points that form the vertices of the triangle.
!
!    Input, integer NODE_SHOW,
!    0, do not show nodes;
!    1, show nodes;
!    2, show nodes and label them.
!
!    Input, integer TRIANGLE_SHOW,
!    0, do not show triangles;
!    1, show triangles;
!    2, show triangles and label them.
!
!  Local parameters:
!
!    Integer CIRCLE_SIZE, controls the size of the circles depicting
!    the nodes.  Currently set to 5.  3 is pretty small, and 1 is
!    barely visible.
!
  implicit none

  integer node_num
  integer triangle_num

  real ( kind = 8 ) ave_x
  real ( kind = 8 ) ave_y
  character ( len = 40 ) date_time
  integer :: circle_size
  integer delta
  character ( len = * ) file_name
  integer file_unit
  integer i
  integer ios
  integer node
  integer node_show
  real ( kind = 8 ) node_xy(2,node_num)
  character ( len = 40 ) string
  integer triangle
  integer triangle_node(6,triangle_num)
  integer triangle_show
  real ( kind = 8 ) x_max
  real ( kind = 8 ) x_min
  integer x_ps
  integer :: x_ps_max = 576
  integer :: x_ps_max_clip = 594
  integer :: x_ps_min = 36
  integer :: x_ps_min_clip = 18
  real ( kind = 8 ) x_scale
  real ( kind = 8 ) y_max
  real ( kind = 8 ) y_min
  integer y_ps
  integer :: y_ps_max = 666
  integer :: y_ps_max_clip = 684
  integer :: y_ps_min = 126
  integer :: y_ps_min_clip = 108
  real ( kind = 8 ) y_scale

  call timestring ( date_time )
!
!  We need to do some figuring here, so that we can determine
!  the range of the data, and hence the height and width
!  of the piece of paper.
!
  x_max = maxval ( node_xy(1,1:node_num) )
  x_min = minval ( node_xy(1,1:node_num) )
  x_scale = x_max - x_min

  x_max = x_max + 0.05D+00 * x_scale
  x_min = x_min - 0.05D+00 * x_scale
  x_scale = x_max - x_min

  y_max = maxval ( node_xy(2,1:node_num) )
  y_min = minval ( node_xy(2,1:node_num) )
  y_scale = y_max - y_min

  y_max = y_max + 0.05D+00 * y_scale
  y_min = y_min - 0.05D+00 * y_scale
  y_scale = y_max - y_min

  if ( x_scale < y_scale ) then

    delta = nint ( real ( x_ps_max - x_ps_min, kind = 8 ) &
      * ( y_scale - x_scale ) / ( 2.0D+00 * y_scale ) )

    x_ps_max = x_ps_max - delta
    x_ps_min = x_ps_min + delta

    x_ps_max_clip = x_ps_max_clip - delta
    x_ps_min_clip = x_ps_min_clip + delta

    x_scale = y_scale

  else if ( y_scale < x_scale ) then

    delta = nint ( real ( y_ps_max - y_ps_min, kind = 8 ) &
      * ( x_scale - y_scale ) / ( 2.0D+00 * x_scale ) )

    y_ps_max      = y_ps_max - delta
    y_ps_min      = y_ps_min + delta

    y_ps_max_clip = y_ps_max_clip - delta
    y_ps_min_clip = y_ps_min_clip + delta

    y_scale = x_scale

  end if
!
!  Open the file.
!
  call get_unit ( file_unit )

  open ( unit = file_unit, file = file_name, status = 'replace', &
    iostat = ios )

  if ( ios /= 0 ) then
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'TRIANGULATION_ORDER6_PLOT - Fatal error!'
    write ( *, '(a)' ) '  Can not open output file.'
    return
  end if
!
!  Write the header.
!
  write ( file_unit, '(a)' ) '%!PS-Adobe-3.0 EPSF-3.0'
  write ( file_unit, '(a)' ) '%%Creator: triangulation_order6_plot.f90'
  write ( file_unit, '(a)' ) '%%Title: ' // trim ( file_name )
  write ( file_unit, '(a)' ) '%%CreationDate: ' // trim ( date_time )
  write ( file_unit, '(a)' ) '%%Pages: 1'
  write ( file_unit, '(a,i3,2x,i3,2x,i3,2x,i3)' ) '%%BoundingBox: ', &
    x_ps_min, y_ps_min, x_ps_max, y_ps_max
  write ( file_unit, '(a)' ) '%%Document-Fonts: Times-Roman'
  write ( file_unit, '(a)' ) '%%LanguageLevel: 1'
  write ( file_unit, '(a)' ) '%%EndComments'
  write ( file_unit, '(a)' ) '%%BeginProlog'
  write ( file_unit, '(a)' ) '/inch {72 mul} def'
  write ( file_unit, '(a)' ) '%%EndProlog'
  write ( file_unit, '(a)' ) '%%Page: 1 1'
  write ( file_unit, '(a)' ) 'save'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  Set the RGB line color to very light gray.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '0.900  0.900  0.900 setrgbcolor'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  Draw a gray border around the page.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) 'newpath'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', x_ps_min, y_ps_min, ' moveto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', x_ps_max, y_ps_min, ' lineto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', x_ps_max, y_ps_max, ' lineto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', x_ps_min, y_ps_max, ' lineto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', x_ps_min, y_ps_min, ' lineto'
  write ( file_unit, '(a)' ) 'stroke'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  Set the RGB line color to black.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '0.000  0.000  0.000 setrgbcolor'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  Set the font and its size.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '/Times-Roman findfont'
  write ( file_unit, '(a)' ) '0.50 inch scalefont'
  write ( file_unit, '(a)' ) 'setfont'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  Print a title.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  210  702  moveto'
  write ( file_unit, '(a)' ) '%  (Triangulation)  show'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  Define a clipping polygon.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) 'newpath'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', &
    x_ps_min_clip, y_ps_min_clip, ' moveto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', &
    x_ps_max_clip, y_ps_min_clip, ' lineto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', &
    x_ps_max_clip, y_ps_max_clip, ' lineto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', &
    x_ps_min_clip, y_ps_max_clip, ' lineto'
  write ( file_unit, '(a,i3,2x,i3,2x,a)' ) '  ', &
    x_ps_min_clip, y_ps_min_clip, ' lineto'
  write ( file_unit, '(a)' ) 'clip newpath'
!
!  Draw the nodes.
!
  if ( node_num <= 200 ) then
    circle_size = 5
  else if ( node_num <= 500 ) then
    circle_size = 4
  else if ( node_num <= 1000 ) then
    circle_size = 3
  else if ( node_num <= 5000 ) then
    circle_size = 2
  else
    circle_size = 1
  end if

  if ( 1 <= node_show ) then

    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Draw filled dots at the nodes.'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Set the RGB color to blue.'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '0.000  0.150  0.750 setrgbcolor'
    write ( file_unit, '(a)' ) '%'

    do node = 1, node_num

      x_ps = int ( &
        ( ( x_max - node_xy(1,node)         ) * real ( x_ps_min, kind = 8 )   &
        + (         node_xy(1,node) - x_min ) * real ( x_ps_max, kind = 8 ) ) &
        / ( x_max                   - x_min ) )

      y_ps = int ( &
        ( ( y_max - node_xy(2,node)         ) * real ( y_ps_min, kind = 8 )   &
        + (         node_xy(2,node) - y_min ) * real ( y_ps_max, kind = 8 ) ) &
        / ( y_max                   - y_min ) )

      write ( file_unit, '(a,i4,2x,i4,2x,i4,2x,a)' ) 'newpath ', x_ps, y_ps, &
        circle_size, '0 360 arc closepath fill'

    end do

  end if
!
!  Label the nodes.
!
  if ( 2 <= node_show ) then

    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Label the nodes:'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Set the RGB color to darker blue.'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '0.100  0.250  0.850 setrgbcolor'
    write ( file_unit, '(a)' ) '/Times-Roman findfont'
    write ( file_unit, '(a)' ) '0.20 inch scalefont'
    write ( file_unit, '(a)' ) 'setfont'

    do node = 1, node_num

      x_ps = int ( &
        ( ( x_max - node_xy(1,node)         ) * real ( x_ps_min, kind = 8 )   &
        + (       + node_xy(1,node) - x_min ) * real ( x_ps_max, kind = 8 ) ) &
        / ( x_max                   - x_min ) )

      y_ps = int ( &
        ( ( y_max - node_xy(2,node)         ) * real ( y_ps_min, kind = 8 )   &
        + (         node_xy(2,node) - y_min ) * real ( y_ps_max, kind = 8 ) ) &
        / ( y_max                   - y_min ) )

      write ( string, '(i4)' ) node
      string = adjustl ( string )

      write ( file_unit, '(i4,2x,i4,a)' ) x_ps, y_ps+5, &
        ' moveto (' // trim ( string ) // ') show'

    end do

  end if
!
!  Draw the triangles.
!
  if ( 1 <= triangle_show ) then
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Set the RGB color to red.'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '0.900  0.200  0.100 setrgbcolor'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Draw the triangles.'
    write ( file_unit, '(a)' ) '%'

    do triangle = 1, triangle_num

      write ( file_unit, '(a)' ) 'newpath'

      node = triangle_node(6,triangle)

      x_ps = int ( &
        ( ( x_max - node_xy(1,node)         ) * real ( x_ps_min, kind = 8 )   &
        + (         node_xy(1,node) - x_min ) * real ( x_ps_max, kind = 8 ) ) &
        / ( x_max                   - x_min ) )

      y_ps = int ( &
        ( ( y_max - node_xy(2,node)         ) * real ( y_ps_min, kind = 8 )   &
        + (         node_xy(2,node) - y_min ) * real ( y_ps_max, kind = 8 ) ) &
        / ( y_max                   - y_min ) )

      write ( file_unit, '(i3,2x,i3,2x,a)' ) x_ps, y_ps, ' moveto'

      do i = 1, 3

        node = triangle_node(i,triangle)

        x_ps = int ( &
          ( ( x_max - node_xy(1,node)         ) * real ( x_ps_min, kind = 8 )   &
          + (         node_xy(1,node) - x_min ) * real ( x_ps_max, kind = 8 ) ) &
          / ( x_max                   - x_min ) )

        y_ps = int ( &
          ( ( y_max - node_xy(2,node)         ) * real ( y_ps_min, kind = 8 )   &
          + (         node_xy(2,node) - y_min ) * real ( y_ps_max, kind = 8 ) ) &
          / ( y_max                   - y_min ) )

        write ( file_unit, '(i3,2x,i3,2x,a)' ) x_ps, y_ps, ' lineto'

        node = triangle_node(i+3,triangle)

        x_ps = int ( &
          ( ( x_max - node_xy(1,node)         ) * real ( x_ps_min, kind = 8 )   &
          + (         node_xy(1,node) - x_min ) * real ( x_ps_max, kind = 8 ) ) &
          / ( x_max                   - x_min ) )

        y_ps = int ( &
          ( ( y_max - node_xy(2,node)         ) * real ( y_ps_min, kind = 8 )   &
          + (         node_xy(2,node) - y_min ) * real ( y_ps_max, kind = 8 ) ) &
          / ( y_max                   - y_min ) )

        write ( file_unit, '(i3,2x,i3,2x,a)' ) x_ps, y_ps, ' lineto'

      end do

      write ( file_unit, '(a)' ) 'stroke'

    end do

  end if
!
!  Label the triangles.
!
  if ( 2 <= triangle_show ) then

    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Label the triangles:'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '%  Set the RGB color to darker red.'
    write ( file_unit, '(a)' ) '%'
    write ( file_unit, '(a)' ) '0.950  0.250  0.150 setrgbcolor'
    write ( file_unit, '(a)' ) '/Times-Roman findfont'
    write ( file_unit, '(a)' ) '0.20 inch scalefont'
    write ( file_unit, '(a)' ) 'setfont'

    do triangle = 1, triangle_num

      ave_x = 0.0D+00
      ave_y = 0.0D+00

      do i = 1, 6

        node = triangle_node(i,triangle)

        ave_x = ave_x + node_xy(1,node)
        ave_y = ave_y + node_xy(2,node)

      end do

      ave_x = ave_x / 6.0D+00
      ave_y = ave_y / 6.0D+00

      x_ps = int ( &
        ( ( x_max - ave_x         ) * real ( x_ps_min, kind = 8 )   &
        + (       + ave_x - x_min ) * real ( x_ps_max, kind = 8 ) ) &
        / ( x_max         - x_min ) )

      y_ps = int ( &
        ( ( y_max - ave_y         ) * real ( y_ps_min, kind = 8 )   &
        + (         ave_y - y_min ) * real ( y_ps_max, kind = 8 ) ) &
        / ( y_max         - y_min ) )

      write ( string, '(i4)' ) triangle
      string = adjustl ( string )

      write ( file_unit, '(i4,2x,i4,a)' ) x_ps, y_ps, ' moveto (' &
        // trim ( string ) // ') show'

    end do

  end if

  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) 'restore  showpage'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%  End of page.'
  write ( file_unit, '(a)' ) '%'
  write ( file_unit, '(a)' ) '%%Trailer'
  write ( file_unit, '(a)' ) '%%EOF'
  close ( unit = file_unit )

  return
end