function triangle_points_plot ( file_name, node_xy, node_show, point_num, ...
  point_xy, point_show )

%*****************************************************************************80
%
%% TRIANGLE_POINTS_PLOT plots a triangle and some points.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    03 October 2006
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Input, string FILE_NAME, the name of the output file.
%
%    Input, real NODE_XY(2,3), the coordinates of the nodes
%    of the triangle.
%
%    Input, integer NODE_SHOW,
%   -1, do not show the triangle, or the nodes.
%    0, show the triangle, do not show the nodes;
%    1, show the triangle and the nodes;
%    2, show the triangle, the nodes and number them.
%
%    Input, integer POINT_NUM, the number of points.
%
%    Input, real POINT_XY(2,POINT_NUM), the coordinates of the
%    points.
%
%    Input, integer POINT_SHOW,
%    0, do not show the points;
%    1, show the points;
%    2, show the points and number them.
%
  node_num = 3;
  x_ps_max = 576;
  x_ps_max_clip = 594;
  x_ps_min = 36;
  x_ps_min_clip = 18;
  y_ps_max = 666;
  y_ps_max_clip = 684;
  y_ps_min = 126;
  y_ps_min_clip = 108;
%
%  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 = max ( max ( node_xy(1,1:node_num) ), ...
                max ( point_xy(1,1:point_num) ) );
  x_min = min ( min ( node_xy(1,1:node_num) ), ...
                min ( point_xy(1,1:point_num) ) );
  x_scale = x_max - x_min;

  x_max = x_max + 0.05 * x_scale;
  x_min = x_min - 0.05 * x_scale;
  x_scale = x_max - x_min;

  y_max = max ( max ( node_xy(2,1:node_num) ), ...
                max ( point_xy(2,1:point_num) ) );
  y_min = min ( min ( node_xy(2,1:node_num) ), ...
                min ( point_xy(2,1:point_num) ) );
  y_scale = y_max - y_min;

  y_max = y_max + 0.05 * y_scale;
  y_min = y_min - 0.05 * y_scale;
  y_scale = y_max - y_min;

  if ( x_scale < y_scale )

    delta = round ( ( x_ps_max - x_ps_min ) ...
      * ( y_scale - x_scale ) / ( 2.0 * 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;

  elseif ( y_scale < x_scale )

    delta = round ( ( y_ps_max - y_ps_min ) ...
      * ( x_scale - y_scale ) / ( 2.0 * 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

  file_unit = fopen ( file_name, 'wt' );

  if ( file_unit < 0 )
    fprintf ( 1, '\n' );
    fprintf ( 1, 'TRIANGLE_POINTS_PLOT - Fatal error!\n' );
    fprintf ( 1, '  Can not open output file.\n' );
    return
  end
  
  fprintf ( file_unit, '%!PS-Adobe-3.0 EPSF-3.0\n' );
  fprintf ( file_unit, '%%Creator: triangulation_order3_plot.f90\n' );
  fprintf ( file_unit, '%%Title: %s\n', file_name );
  fprintf ( file_unit, '%%Pages: 1\n' );

  fprintf ( file_unit, '%%BoundingBox:  %4d  %4d  %4d  %4d\n', ...
    x_ps_min, y_ps_min, x_ps_max, y_ps_max );
  fprintf ( file_unit, '%%Document-Fonts: Times-Roman\n' );
  fprintf ( file_unit, '%%LanguageLevel: 1\n' );
  fprintf ( file_unit, '%%EndComments\n' );
  fprintf ( file_unit, '%%BeginProlog\n' );
  fprintf ( file_unit, '/inch {72 mul} def\n' );
  fprintf ( file_unit, '%%EndProlog\n' );
  fprintf ( file_unit, '%%Page: 1 1\n' );
  fprintf ( file_unit, 'save\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, '%  Set the RGB line color to very light gray.\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, '0.900  0.900  0.900 setrgbcolor\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, '%  Draw a gray border around the page.\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, 'newpath\n' );
  fprintf ( file_unit, '  %4d  %4d  moveto\n', x_ps_min, y_ps_min );
  fprintf ( file_unit, '  %4d  %4d  lineto\n', x_ps_max, y_ps_min );
  fprintf ( file_unit, '  %4d  %4d  lineto\n', x_ps_max, y_ps_max );
  fprintf ( file_unit, '  %4d  %4d  lineto\n', x_ps_min, y_ps_max );
  fprintf ( file_unit, '  %4d  %4d  lineto\n', x_ps_min, y_ps_min );
  fprintf ( file_unit, 'stroke\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, '%  Set the RGB color to black.\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, '0.000  0.000  0.000 setrgbcolor\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, '%  Set the font and its size.\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, '/Times-Roman findfont\n' );
  fprintf ( file_unit, '0.50 inch scalefont\n' );
  fprintf ( file_unit, 'setfont\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, '%  Print a title.\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, '%  210  702  moveto\n' );
  fprintf ( file_unit, '%  (Triangulation)  show\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, '%  Define a clipping polygon.\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, 'newpath\n' );
  fprintf ( file_unit, '  %4d  %4d  moveto\n', x_ps_min_clip, y_ps_min_clip );
  fprintf ( file_unit, '  %4d  %4d  lineto\n', x_ps_max_clip, y_ps_min_clip );
  fprintf ( file_unit, '  %4d  %4d  lineto\n', x_ps_max_clip, y_ps_max_clip );
  fprintf ( file_unit, '  %4d  %4d  lineto\n', x_ps_min_clip, y_ps_max_clip );
  fprintf ( file_unit, '  %4d  %4d  lineto\n', x_ps_min_clip, y_ps_min_clip );
  fprintf ( file_unit, 'clip newpath\n' );
%
%  Draw the nodes.
%
  if ( 1 <= node_show )

    circle_size = 5;

    fprintf ( file_unit, '%\n' );
    fprintf ( file_unit, '%  Draw filled dots at the nodes.\n' );
    fprintf ( file_unit, '%\n' );
    fprintf ( file_unit, '%  Set the RGB color to blue.\n' );
    fprintf ( file_unit, '%\n' );
    fprintf ( file_unit, '0.000  0.150  0.750 setrgbcolor\n' );
    fprintf ( file_unit, '%\n' );

    for node = 1 : 3

      x_ps = round ( ...
        ( ( x_max - node_xy(1,node)         ) * x_ps_min   ...
        + (         node_xy(1,node) - x_min ) * x_ps_max ) ...
        / ( x_max                   - x_min ) );

      y_ps = round ( ...
        ( ( y_max - node_xy(2,node)         ) * y_ps_min   ...
        + (         node_xy(2,node) - y_min ) * y_ps_max ) ...
        / ( y_max                   - y_min ) );

      fprintf ( file_unit, 'newpath  %4d  %4d  %4d  0 360 arc closepath fill\n',...
        x_ps, y_ps, circle_size );

    end

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

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

    for node = 1 : node_num

      x_ps = round ( ...
        ( ( x_max - node_xy(1,node)         ) * x_ps_min   ...
        + (       + node_xy(1,node) - x_min ) * x_ps_max ) ...
        / ( x_max                   - x_min ) );

      y_ps = round ( ...
        ( ( y_max - node_xy(2,node)         ) * y_ps_min   ...
        + (         node_xy(2,node) - y_min ) * y_ps_max ) ...
        / ( y_max                   - y_min ) );

      fprintf ( file_unit, '%4d  %4d  moveto ( %4d ) show\n', x_ps, y_ps+5, node );

    end

  end
%
%  Draw the points.
%
  if ( point_num <= 200 )
    circle_size = 5;
  elseif ( point_num <= 500 )
    circle_size = 4;
  elseif ( point_num <= 1000 )
    circle_size = 3;
  elseif ( point_num <= 5000 )
    circle_size = 2;
  else
    circle_size = 1;
  end

  if ( 1 <= point_show )

    fprintf ( file_unit, '%\n' );
    fprintf ( file_unit, '%  Draw filled dots at the points.\n' );
    fprintf ( file_unit, '%\n' );
    fprintf ( file_unit, '%  Set the RGB color to green.\n' );
    fprintf ( file_unit, '%\n' );
    fprintf ( file_unit, '0.150  0.750  0.000 setrgbcolor\n' );
    fprintf ( file_unit, '%\n' );

    for point = 1 : point_num

      x_ps = round ( ...
        ( ( x_max - point_xy(1,point)         ) * x_ps_min   ...
        + (         point_xy(1,point) - x_min ) * x_ps_max ) ...
        / ( x_max                     - x_min ) );

      y_ps = round ( ...
        ( ( y_max - point_xy(2,point)         ) * y_ps_min   ...
        + (         point_xy(2,point) - y_min ) * y_ps_max ) ...
        / ( y_max                     - y_min ) );

      fprintf ( file_unit, 'newpath  %4d  %4d  %4d  0 360 arc closepath fill\n', ...
        x_ps, y_ps, circle_size );

    end

  end
%
%  Label the points.
%
  if ( 2 <= point_show )

    fprintf ( file_unit, '%\n' );
    fprintf ( file_unit, '%  Label the point:\n' );
    fprintf ( file_unit, '%\n' );
    fprintf ( file_unit, '%  Set the RGB color to darker green.\n' );
    fprintf ( file_unit, '%\n' );
    fprintf ( file_unit, '0.250  0.850  0.000 setrgbcolor\n' );
    fprintf ( file_unit, '/Times-Roman findfont\n' );
    fprintf ( file_unit, '0.20 inch scalefont\n' );
    fprintf ( file_unit, 'setfont\n' );
    fprintf ( file_unit, '%\n' );

    for point = 1 : point_num

      x_ps = round ( ...
        ( ( x_max - point_xy(1,point)         ) * x_ps_min   ...
        + (       + point_xy(1,point) - x_min ) * x_ps_max ) ...
        / ( x_max                     - x_min ) );

      y_ps = round ( ...
        ( ( y_max - point_xy(2,point)         ) * y_ps_min   ...
        + (         point_xy(2,point) - y_min ) * y_ps_max ) ...
        / ( y_max                     - y_min ) );

      fprintf ( file_unit, '%4d  %4d  moveto ( %4d ) show\n', x_ps, y_ps+5, point );

    end

  end
%
%  Draw the triangle.
%
  if ( 0 <= node_show )

    fprintf ( file_unit, '%\n' );
    fprintf ( file_unit, '%  Set the RGB color to red.\n' );
    fprintf ( file_unit, '%\n' );
    fprintf ( file_unit, '0.900  0.200  0.100 setrgbcolor\n' );
    fprintf ( file_unit, '%\n' );
    fprintf ( file_unit, '%  Draw the triangle.\n' );
    fprintf ( file_unit, '%\n' );

    fprintf ( file_unit, 'newpath\n' );

    for i = 1 : 4

      node = i4_wrap ( i, 1, 3 );

      x_ps = round ( ...
        ( ( x_max - node_xy(1,node)         ) * x_ps_min   ...
        + (         node_xy(1,node) - x_min ) * x_ps_max ) ...
        / ( x_max                   - x_min ) );

      y_ps = round ( ...
        ( ( y_max - node_xy(2,node)         ) * y_ps_min   ...
        + (         node_xy(2,node) - y_min ) * y_ps_max ) ...
        / ( y_max                   - y_min ) );

      if ( i == 1 )
        fprintf ( file_unit, '%3d  %3d  moveto\n', x_ps, y_ps );
      else
        fprintf ( file_unit, '%3d  %3d  lineto\n', x_ps, y_ps );
      end

    end

    fprintf ( file_unit, 'stroke\n' );

  end

  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, 'restore  showpage\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, '%  End of page.\n' );
  fprintf ( file_unit, '%\n' );
  fprintf ( file_unit, '%%Trailer\n' );
  fprintf ( file_unit, '%%EOF\n' );

  fclose ( file_unit );

  return
end