NAME

       pslib 4.0 - A PostScript based plotting library


DESCRIPTION

       pslib was created to make the generation of PostScript page description
       code easier. It is a library that contains a series of tools  that  can
       be  used  to  create plots. The resulting PostScript code is ASCII text
       and can be edited using any text editor. Thus, it  is  fairly  easy  to
       modify a plot file even after it has been created, e.g., to change text
       strings, set new gray shades or colors,  experiment  with  various  pen
       widths,  etc.   pslib is written in C but now includes FORTRAN bindings
       (thanks to John Goff, WHOI) and can therefore be called from both C and
       FORTRAN programs. To use this library, you must link your plotting pro-
       gram with pslib.a. pslib is the core of the GMT SYSTEM and XY  graphics
       programs.  pslib  output  conforms to the Adobe Encapsulated PostScript
       File Specification Version 3.0 (EPSL), and may be used as EPS files and
       inserted  into,  say,  a  Word document on a Mac. See Appendix F in the
       Technical Reference for detailed instructions.

       Before any pslib calls can be issued, the plotting system must be  ini-
       tialized.  This  is  done by calling ps_plotinit, which defines macros,
       sets up the plot-coordinate system, scales, and  [optionally]  opens  a
       file  where all the PostScript code will be written. Normally, the plot
       code is written to stdout. The measure unit for sizes and positions can
       be  set to be centimeter (c), inch (i), or meter (m). When all plotting
       is done, you must terminate the plotting system by calling  ps_plotend.

       pslib  uses the direct color model where red, green, and blue are given
       separately, each must be in the range from 0-255. If red <  0  then  no
       fill  operation  takes  place.   Most plot-items can be plotted with or
       without outlines. If outline is desired (i.e., set to 1),  it  will  be
       drawn  using the current linewidth and pattern. pslib uses highly opti-
       mized macro substitutions and scales the coordinates depending  on  the
       resolution  of  the  hardcopy device so that the output file is kept as
       compact as possible.

       A wide variety of output devices that support PostScript exist, includ-
       ing   laserwriters  (color  or  monochrome)  and  workstations  running
       PostScript based window systems like SUNs OpenWindows. xnews  (part  of
       OpenWindows)  or  ghostscript  (public  domain)  can  be used to create
       rasterfiles at a user-defined resolution (DPI), making it  possible  to
       render  PostScript  on  a  Versatec  and  other  non-PostScript  raster
       devices. Regular SUN rasterfiles created  under  NeWS  from  PostScript
       files  can  be  sent  to  a  variety of color hardcopy units. Check the
       devices available on your network.


FUNCTION CALLS

       The following is a list of available functions and a short  description
       of  what  they  do  and what parameters they expect. All floating point
       variables are expected to be double (i.e., 8 bytes), whereas all  inte-
       gers  are  assumed  to  be  4  bytes  long.  All plotting functions are
       declared as functions returning an int. Currently, the return value  is
       undefined.


              void ps_arc (x, y, radius, angle1, angle2, status)
              double x, y, radius, angle1, angle2;
              int status;
                 Draws  a  circular arc centered on (x,y) from angle angle1 to
                 angle2.  Angles must be given in decimal degrees. If angle1 >
                 angle2,  a  negative  arc  is drawn. status is a value from 0
                 through 3. 1 means set new anchor point, 2 means  stroke  the
                 circle, 3 means both, 0 means none of the above.

              void  ps_axis  (xpos,  ypos, length, startval, stopval, tickval,
              label, annotpointsize, side)
              double xpos, ypos, length, startval, stopval, tickval;
              double annotpointsize, side;
              char *label;
                 Plots an axis with tickmarks, annotation,  and  label.  xpos,
                 ypos, and length are in inches (or cm or meters), annotpoint-
                 size in points (72 points = 1  inch),  else  data  units  are
                 used.  side can be 0, 1, 2, or 3, which selects lower x-axis,
                 right y-axis, upper x-axis,  or  left  y-axis,  respectively.
                 labelpointsize  =  1.5  * annotpointsize.  A negative tickval
                 will reverse the sense of positive direction, e.g.,  to  have
                 the y-axis be positive down.

              void ps_circle (xcenter, ycenter, diameter, rgb, outline)
              double xcenter, ycenter, diameter;
              int rgb[3], outline;
                 Plots a circle and fills it with the specified color. If out-
                 line == 1, the outline will be drawn using current  pen-width
                 and -pattern.

              void ps_clipoff ()
                 Resets  the  clip path to what it was before the last call to
                 ps_clipon.

              void ps_clipon (xarray, yarray, npoints, rgb, flag)
              double xarray[], yarray[];
              int npoints, rgb[3], flag;
                 Sets up a user-definable clip  path.  Plotting  outside  this
                 polygon will be clipped until ps_clipoff is called. If red >=
                 0 the inside of the path is filled with the specified  color.
                 flag  is used to create complex clip paths consisting of sev-
                 eral disconnected regions, and takes on values 0-3. flag =  1
                 means  this  is  the first path in a multi-segment clip path.
                 flag = 2 means this is the last segment. Thus, for  a  single
                 path, flag = 3.

              void  ps_colorimage  (xpos,  ypos, xlength, ylength, buffer, nx,
              ny, depth)
              double xpos, ypos, xlength, ylength;
              unsigned char buffer[];
              int nx, ny, depth;
                 Plots a 1-, 4-, 8-, or 24-bit deep image.  The  pixel  values
                 are  stored  in buffer.  This functions sets up a call to the
                 PostScript colorimage  or  image  operators.   If  -depth  is
                 passed  instead then rgb is converted to cmyk first.  Specify
                 position of lower left corner and size (in inches) of  image.
                 buffer is an unsigned character array in scanline orientation
                 with gray shade or r,g, b values (0 - 255) where 0 is  black,
                 255  is white. depth is number of bits pr pixel (24, 8, 4, or
                 1). nx,ny refers to  the  number  of  pixels  in  image.  The
                 rowlength  of  buffer  must be an integral number of 8/depth.
                 buffer[0] is upper left corner.  E.g.  if  depth  =  4,  then
                 buffer[j]/16  gives  shade  for  pixel[2j-1] and buffer[j]%16
                 (mod 16) gives shade for pixel[2j].  If -nx  is  passed  then
                 the  first  three  bytes  of buffer holds the r/g/b color for
                 pixels that are to be masked out using the PostScript Level 3
                 Color  Mask  method.  See the Adobe Systems PostScript Refer-
                 ence Manual for more details.

              void ps_colortiles (x0, y0, xlength, ylength, buffer, nx, ny)
              double x0, y0, xlength, ylength;
              int nx, ny;
              unsigned char buffer[];
                 Plots a true color image based on individual color tiles. x0,
                 y0  is  the location of the lower left corner of the image in
                 inches. xlength, ylength is the image size in inches.  buffer
                 contains  rgb  triplets  stored as rgbrgbrgb... nx, ny is the
                 image size in pixels.

              void ps_command (text)
              char *text;
                 Writes a raw PostScript  command  to  the  PostScript  output
                 file, e.g. "1 setlinejoin".

              void ps_comment (text)
              char *text;
                 Writes  a  comment (text) to the PostScript output file, e.g.
                 "Start of graph 2".

              void ps_cross (xcenter, ycenter, diameter)
              double xcenter, ycenter, diameter;
                 Plots a cross at the specified point using current  pen-width
                 and -pattern that fits inside a circle of given diameter.

              void ps_diamond (xcenter, ycenter, diameter, rgb, outline)
              double xcenter, ycenter, diameter;
              int rgb[3], outline;
                 Plots  a  diamond  and  fills it with the specified color. If
                 outline == 1, the outline will be drawn  using  current  pen-
                 width  and  -pattern.  The symbol will fit inside a circle of
                 given diameter.

              void ps_ellipse (xcenter, ycenter,  angle,  major,  minor,  rgb,
              outline)
              double xcenter, ycenter, angle, major, minor;
              int rgb[3], outline;
                 Plots  a  ellipse  with  its  major semiaxis rotated by angle
                 degrees and fills it with the specified color. If outline  ==
                 1,  the  outline  will  be  drawn using current pen-width and
                 -pattern.

              void ps_encode_font (font_no)
              int font_no;
                 Will reencode this font using the current encoding vector  if
                 it is not StandardEncoding.

              void ps_flush ()
                 Flushes the output buffer.

              void ps_hexagon (xcenter, ycenter, diameter, rgb, outline)
              double xcenter, ycenter, diameter;
              int rgb[3], outline;
                 Plots  a  hexagon  and  fills it with the specified color. If
                 outline == 1, the outline will be drawn  using  current  pen-
                 width  and  -pattern.  The symbol will fit inside a circle of
                 given diameter.

              void ps_image (xpos, ypos, xlength,  ylength,  buffer,  nx,  ny,
              bits)
              double xpos, ypos, xlength, ylength;
              unsigned char buffer[];
              int nx, ny, bits;
                 Obsolete, simply passes arguments to ps_colorimage.

              void  ps_imagefill (x, y, n, image, imagefile, invert, imagedpi,
              outline, template, r_rgb, b_rgb)
              double x[], y[], x0, y0;
              int n, image, invert,  imagedpi,  outline,  template,  f_rgb[3],
              b_rgb[3];
              char imagefile;
                 Similar  to ps_polygon, but fills the area with an image pat-
                 tern rather than a color or  grayshade.  x  and  y  hold  the
                 arrays of n points. 90 predefined patterns are available (See
                 GMT Appendix E). image gives the image number (1-90). If  set
                 to  0,  imagefile must be the name to the user’s image, which
                 must be stored as a SUN 1-, 8-, or 24-bit  rasterfile.  1-bit
                 images  only:  (i) If invert is TRUE (1), the black and white
                 pixels are interchanged before plotting. (ii) If template  is
                 TRUE  (1),  the set pixels are colored using the RGB combina-
                 tion in f_rgb, while the unset are painted  with  b_rgb.  The
                 unit  size  of the image is controlled by imagedpi. If set to
                 zero, the image is plotted at the device resolution. If  out-
                 line  is TRUE, the current penwidth is used to draw the poly-
                 gon outline.

              void ps_imagemask (xpos, ypos, xlength, ylength, buffer, nx, ny,
              polarity, rgb)
              double xpos, ypos, xlength, ylength;
              unsigned char buffer[];
              int nx, ny, polarity, rgb[3];
                 Plots  a  transparent  1-bit  image  mask using the given rgb
                 color. Specify position of lower left  corner  and  size  (in
                 inches)  of image. buffer is an unsigned character array with
                 8 pixels per byte. nx,ny refers to the number  of  pixels  in
                 image.  The rowlength of buffer must be an integral number of
                 8. buffer[0] is upper left corner. buffer values  are  stored
                 as  columns,  starting at the lower left corner and ending at
                 the upper right corner. If polarity is 0 then the  bits  that
                 are  0 are painted with the rgb color, else the bits that are
                 1 are colored.  See the Adobe  Systems  PostScript  Reference
                 Manual for more details.

              void ps_itriangle (xcenter, ycenter, diameter, rgb, outline)
              double xcenter, ycenter, diameter;
              int rgb[3], outline;
                 Plots  an  inverted and fills it with the specified color. If
                 outline == 1, the outline will be drawn  using  current  pen-
                 width  and  -pattern.  The symbol will fit inside a circle of
                 given diameter.

              void ps_line (xarray, yarray, npoints, type, close, split)
              double xarray[], yarray[];
              int npoints, type, close, split;
                 Draw a continuous line from the positions in the x-y  arrays.
                 If close == 1, the first and last point will automatically be
                 closed by the PostScript driver.  If this is the  first  seg-
                 ment  in a multi-segment path, set type == 1. To end the seg-
                 ments and have the line(s) drawn, set type == 2. Thus, for  a
                 single  segment,  type must be 3. The line is drawn using the
                 current penwidth.  Only if split is TRUE may ps_line use mul-
                 tiple strokes to draw lines longer that MAX_PATH.  ps_polygon
                 will call ps_line with split = FALSE since the path  must  be
                 continuous.   If  split  is  FALSE and the pathlength exceeds
                 MAX_PATH a warning will be issued.

              unsigned char *ps_loadraster (fp,  header,  invert,  monochrome,
              template, f_rgb, b_rgb)
              FILE *fp;
              struct rasterfile *header;
              BOOLEAN invert, monochrome, template;
              int f_rgb[], b_rgb[];
                 Reads  the image contents of the Sun rasterfile pointed to by
                 the open filepointer fp.  The header must first  be  obtained
                 with  ps_read_rasheader.  If invert is TRUE then 1-bit images
                 will be bit-reversed. If monochrome is TRUE then color images
                 are  converted to grayimages using the TV YIQ translation. If
                 template is TRUE then 1-bit images will  be  colorized  using
                 the  for-  and background colors provided in f_rgb and b_rgb.
                 The routine can handle 1-, 8-, 24-, or 32-bit files  in  old,
                 standard, run-length encoded, or RGB-style Sun format.

              void ps_octagon (xcenter, ycenter, diameter, rgb, outline)
              double xcenter, ycenter, diameter;
              int rgb[3], outline;
                 Plots  a  octagon  and  fills it with the specified color. If
                 outline == 1, the outline will be drawn  using  current  pen-
                 width  and  -pattern.  The symbol will fit inside a circle of
                 given diameter.

              void ps_patch (xarray, yarray, npoints, rgb, outline)
              double xarray[], yarray[];
              int npoints, rgb[3], outline;
                 Identical to ps_polygon except polygon must be  <  20  points
                 long and there will be no attempt to shorten the path by dis-
                 carding unnecessary intermediate points along  straight  seg-
                 ments.  Primarily  used  when  painting large number of small
                 polygons and not waste output space.

              void ps_pentagon (xcenter, ycenter, diameter, rgb, outline)
              double xcenter, ycenter, diameter;
              int rgb[3], outline;
                 Plots a pentagon and fills it with the  specified  color.  If
                 outline  ==  1,  the outline will be drawn using current pen-
                 width and -pattern.  The symbol will fit inside a  circle  of
                 given diameter.

              void  ps_pie (xcenter, ycenter, radius, azimuth1, azimuth2, rgb,
              outline)
              double xcenter, ycenter, radius, azimuth1, azimuth2;
              int rgb[3], outline;
                 Plots a sector of a circle and paints it with  the  specified
                 RGB  combination.  If outline == 1, the outline will be drawn
                 using current pen-width and -pattern.

              void ps_plot (xabs, yabs, kpen)
              double xabs, yabs;
              int kpen;
                 Absolute  move  (kpen=3)  or  draw  (kpen=2),  using  current
                 linewidth.  Use (kpen=-2) to make sure the line is stroked.

              void ps_plotend (last_page)
              int last_page;
                 Terminates  the  plotting  sequence  and closes plot file (if
                 other than stdout). If last_page  ==  1,  then  a  PostScript
                 showpage command is issued, which initiates the printing pro-
                 cess on hardcopy devices.

              void ps_plotinit (plotfile, overlay,  mode,  xoff,  yoff,  xscl,
              yscl, ncopies, dpi, unit, pagesize, rgb, encoding, eps)
              char *plotfile, *encoding;
              int overlay, mode, ncopies, dpi, unit;
              double xoff, yoff, xscl, yscl;
              int pagesize[2], rgb[3]; struct EPS * eps;
                 Initializes  the  plotting. If plotfile == NULL (or ""), then
                 output is sent to stdout, else output is  sent  to  plotfile.
                 overlay  should  be  1  only if you plan to append it to some
                 existing PostScript file. mode contains three  flags  in  the
                 three  lowest bits. The lowest bit controls the plot orienta-
                 tion and can be 0 (Landscape) or 1 (Portrait). The next  bit,
                 if  set  to  1,  will re-encode the fonts to include European
                 accented characters using the now-obsolete  GMT3.4  encoding.
                 To use the ISOLatin1 encoding set the 5th bit to 1. The third
                 bit controls the format used to write  PostScript  images:  0
                 means  binary,  1  means hexadecimal. Most printers needs the
                 latter while some can handle binary which are 50% smaller and
                 therefore  execute  faster.   xoff,yoff  are used to move the
                 origin from the default position in the  lower  left  corner.
                 xscl,yscl  are  used to scale the entire plot (Usually set to
                 1.0, 1.0). Set ncopies to get more than 1 copy. dpi sets  the
                 hardcopy  resolution in dots pr units. For optimum plot qual-
                 ity and processing speed, choose dpi to  match  the  intended
                 plotter  resolution.  Examples are 300 for most laserwriters,
                 2540 for Linotype-300, and  ~85  for  SUN  screens.  When  in
                 doubt,  use  300.  unit  can be any of 0 (CM), 1 (INCH), or 2
                 (M), telling the plot system what units are used for distance
                 and  sizes.  Note  that, regardless of choice of unit, dpi is
                 still in dots-pr-inch. pagesize means the physical width  and
                 height of the plotting media in points, (typically 612 by 792
                 for Letter or 595 by 842 for A4 laserwriter plotters. The rgb
                 array   holds   the  color  of  the  page  (usually  white  =
                 255,255,255).  The encoding is the name of a character encod-
                 ing scheme to be used, e.g., Standard, ISOLatin1, ISO-8859-2,
                 etc.  The EPS structure is defined  in  the  pslib.h  include
                 file  and contains information that will make up the comments
                 header of a EPS file.  Programmers who  plan  to  call  pslib
                 routines should read the comments in pslib.h first. Note that
                 the FORTRAN binding does not expect this last argument.

              void ps_plotr (xrel, yrel, kpen)
              double xrel, yrel;
              int kpen;
                 Move (kpen = 3) or draw (kpen = 2) relative to current  point
                 (see  ps_plot).   Use  (kpen=-2)  to  make  sure  the line is
                 stroked.

              void ps_polygon (xarray, yarray, npoints, rgb, outline)
              double xarray[], yarray[];
              int npoints, rgb[3], outline;
                 Creates a colored polygon  from  the  positions  in  the  x-y
                 arrays.   Polygon   will   automatically  be  closed  by  the
                 PostScript driver. If outline == 0, no outline is  drawn.  If
                 outline == 1, the outline is drawn using current penwidth.

              int ps_read_rasheader (fp, header)
              FILE *fp;
              struct rasterfile *header;
                 Using  the  pointer  fp  to  the open file, return the header
                 structure of the Sun rasterfile. This call is portable as  it
                 operates  on  the byte level. Once the header is returned you
                 may obtain the raster image with ps_loadraster.

              void ps_rect (x1, y1, x2, y2, rgb, outline)
              double x1, y1, x2, y2;
              int red, green, blue, outline;
                 Plots a colored rectangle. (x1,y1) and (x2,y2)  are  any  two
                 corners  on a diagonal.  If outline == 1, the outline will be
                 drawn using current pen-width and -pattern.

              void ps_rotatetrans (x, y, angle)
              double x, y, angle;
                 Rotates the coordinate system by angle degrees,  then  trans-
                 lates origin to (x,y).

              void ps_setdash (pattern, offset)
              char *pattern;
              int offset;
                 Changes the current dashpattern. The character string pattern
                 is set to the desired pattern. E.g., "4 2"  and  offset  =  1
                 will plot like:
                      x ---- ---- ----
                 etc,  where  x is starting point (The x is not plotted). That
                 is, the line is made up of a repeating pattern of a  4  units
                 long line and a 2 unit long gap, starting 1 unit after the x.
                 To reset to solid line, specify pattern = NULL ("") and  off-
                 set = 0. Units are in dpi units.

              void ps_setfont (fontnr)
              int fontnr;
                 Changes  the  current font number to fontnr. The fonts avail-
                 able are: 0 = Helvetica, 1 = H. Bold, 2 = H. Oblique, 3 =  H.
                 Bold-Oblique,  4  = Times, 5 = T. Bold, 6 = T. Italic, 7 = T.
                 Bold Italic, 8 = Courier, 9 = C. Bold, 10 = C Oblique, 11 = C
                 Bold  Oblique,  12  =  Symbol,  13  =  AvantGarde-Book,  14 =
                 A.-BookOblique, 15 = A.-Demi, 16 = A.-DemiOblique, 17 = Book-
                 man-Demi,  18 = B.-DemiItalic, 19 = B.-Light, 20 = B.-LightI-
                 talic, 21 =  Helvetica-Narrow,  22  =  H-N-Bold,  23  =  H-N-
                 Oblique,  24  = H-N-BoldOblique, 25 = NewCenturySchlbk-Roman,
                 26 = N.-Italic, 27  =  N.-Bold,  28  =  N.-BoldItalic,  29  =
                 Palatino-Roman,   30   =   P.-Italic,  31  =  P.-Bold,  32  =
                 P.-BoldItalic, 33 = ZapfChancery-MediumItalic, 34 = ZapfDing-
                 bats,  35 = Ryumin-Light-EUC-H, 36 = Ryumin-Light-EUC-V, 37 =
                 GothicBBB-Medium-EUC-H, and 38 =  GothicBBB-Medium-EUC-V.  If
                 fontnr is outside this range, it is set to 0.

              void ps_setformat (n_decimals)
              int n_decimals;
                 Sets number of decimals to be used when writing color or gray
                 values. The default setting of 3 gives 1000 choices per  red,
                 green,  and  blue  value,  which is more than the 255 choices
                 offered by most 24-bit platforms. Choosing a lower value will
                 make  the  output  file  smaller at the expense of less color
                 resolution. Still, a value of 2 gives 100 x 100  x  100  =  1
                 million  colors,  more  than most eyes can distinguish. For a
                 setting of 1, you will have 10 nuances per primary color  and
                 a total of 1000 unique combinations.

              void ps_setline (linewidth)
              int linewidth;
                 Changes  the current linewidth in DPI units. 0 gives thinnest
                 line, but the use of  0  is  implementation-dependent  (Works
                 fine on most laserwriters).

              void ps_setpaint (rgb)
              int rgb[3];
                 Changes the current RGB setting for pens and text.

              void ps_square (xcenter, ycenter, diameter, rgb, outline)
              double xcenter, ycenter, diameter;
              int rgb[3], outline;
                 Plots a square and fills it with the specified color. If out-
                 line == 1, the outline will be drawn using current  pen-width
                 and  -pattern.   The symbol will fit inside a circle of given
                 diameter.

              void ps_star (xcenter, ycenter, diameter, rgb, outline)
              double xcenter, ycenter, diameter;
              int rgb[3], outline;
                 Plots a star and fills it with the specified color.  If  out-
                 line  == 1, the outline will be drawn using current pen-width
                 and -pattern.  The symbol will fit inside a circle  of  given
                 diameter.

              void ps_text (x, y, pointsize, text, angle, justify, form)
              double x, y, pointsize, angle;
              char *text;
              int justify, form;
                 The text is plotted starting at (x,y), and will make an angle
                 with the horizontal. The  point  (x,y)  maps  onto  different
                 points  of  the  textstring by giving various values for jus-
                 tify. It is used as follows:

                           9------------10----------- 11
                           | |
                           5 6 7
                           | |
                           1------------ 2------------ 3
                 The box represents the textstring. E.g., to plot a textstring
                 with  its center of gravity at (x,y), you must use justify ==
                 6. If justify is negative,  then  all  leading  and  trailing
                 blanks   are  stripped  before  plotting.  Certain  character
                 sequences (flags) have special meaning to ps_text. @~ toggles
                 between  current  font  and  the  Mathematical  Symbols font.
                 @%no% sets font to no; @%% resets to starting font.  @- turns
                 subscript on/off, @+ turns superscript on/off, @# turns small
                 caps on/off, and @\ will make a composite  character  of  the
                 following  two character.  Give fontsize in points (72 points
                 = 1 inch). Normally, the text is typed  using  solid  charac-
                 ters.   To  draw outline characters, set form == 1. If point-
                 size is negative it means that the current point has  already
                 been  set  before ps_text was called and that (x,y) should be
                 ignored.

              void ps_textbox (x, y, pointsize, text, angle, justify, outline,
              dx, dy, rgb)
              double x, y, angle, pointsize, dx, dy;
              char *text;
              int justify, outline, rgb[3];
                 This  function is used in conjugation with ps_text when a box
                 surrounding the text string is desired. Taking  most  of  the
                 arguments of ps_text, the user must also specify the color of
                 the resulting rectangle, and whether its  outline  should  be
                 drawn.  More  room between text and rectangle can be obtained
                 by setting dx and dy accordingly.

              void ps_transrotate (x, y, angle)
              double x, y, angle;
                 Translates the origin to (x,y), then rotates  the  coordinate
                 system by angle degrees.

              void ps_triangle (xcenter, ycenter, diameter, rgb, outline)
              double xcenter, ycenter, diameter;
              int rgb[3], outline;
                 Plots  a triangle and paints it with the specified RGB combi-
                 nation. If outline == 1, the outline will be drawn using cur-
                 rent  pen-width  and  -pattern.  The symbol will fit inside a
                 circle of given diameter.

              void ps_vector (xtail, ytail, xtip, ytip, tailwidth, headlength,
              headwidth, headshape, rgb, outline)
              double  xtail,  ytail,  xtip, ytip, tailwidth, headlength, head-
              width, headshape;
              int rgb[3], outline;
                 Draws a vector of size and appearance  as  specified  by  the
                 various parameters. headshape can take on values from 0-1 and
                 specifies how far the intersection point between the base  of
                 a  straight  vector  head and the vector line is moved toward
                 the tip. 0 gives a triangular head, 1.0 gives an arrow shaped
                 head.  If  outline == 1, the outline will be drawn using cur-
                 rent penwidth. Add 8 to outline for a double-headed vector.

              void ps_words  (x,  y,  text,  n_words,  line_space,  par_width,
              par_just, font, font_size, angle, rgb, justify, draw_box, x_off,
              y_off, x_gap, y_gap, boxpen_width,  boxpen_texture,  boxpen_off-
              set,  boxpen_rgb,  vecpen_width,  vecpen_texture, vecpen_offset,
              vecpen_rgb, boxfill_rgb)
              double x, y, line_space, par_width, angle, x_off, y_off,  x_gap,
              y_gap;
              int  n_words,  font, font_size, justify, draw_box, boxpen_width,
              boxpen_offset;
              int boxpen_rgb[3], vecpen_width,  vecpen_offset,  vecpen_rgb[3],
              boxfill_rgb[3];
              char **text, *boxpen_texture, *vecpen_texture;
                 Typesets paragraphs of text. text is an array of the words to
                 typeset, using the given line-spacing  and  paragraph  width.
                 The  whole  text  block  is  positioned  at x, y which is the
                 anchor  point  on  the  box  as  indicated  by  justify  (see
                 ps_text).  The  whole  block is then shifted by x_off, y_off.
                 Inside the box, text is justified left, centered,  right,  or
                 justified  as governed by par_just (lcrj).  draw_box contains
                 4 bit flags pertaining to the surrounding outline box. If on,
                 the  first (lowest) bit draws the box outline. The second bit
                 fills the box interior. The third bit makes the  outline  box
                 have  rounded  corners  (unless x_gap, y_gap, which specifies
                 the padding between the text and the box,  are  zero),  while
                 the  forth  bit  draws a line from the original x, y point to
                 the shifted position.  The  escape  sequences  described  for
                 ps_text  applies  here,  as  well as two additional commands:
                 @;r/g/b; changes the font color (@;; resets it), and  @:size:
                 changes the font size (@:: resets it).


AUTHOR

       Paul  Wessel,  School  of  Ocean and Earth Science and Technology, 1680
       East-West  Road,  Honolulu,  Hawaii  96822,  (808)  956-4778,  Internet
       address: pwessel@hawaii.edu.


BUGS

       Caveat Emptor: The author is not responsible for any disasters, suicide
       attempts, or ulcers caused by correct or incorrect use of pslib. If you
       find bugs, please report them to the author by electronic mail. Be sure
       to provide enough detail so that I can recreate the problem.


RESTRICTIONS

       Due to the finite memory of some output devices like Laserwriters, cer-
       tain  restrictions  due  to  limitations  of the PostScript interpreter
       apply: For now, the arrays passed to ps_clipon and ps_polygon must con-
       tain  less  than  about  1350  points. Also, the buffer array passed to
       ps_image must be able to fit in the available memory. Check the  speci-
       fications  of the hardcopy device you are using.  Note that some Raster
       Image Processors (RIPs) do not support direct color so that the  colors
       you get may not be exactly the ones you wanted. This is a limitation of
       the RIP, not the underlying PostScript code generated by pslib.


REFERENCES

       Adobe Systems Inc., 1990, PostScript  language  reference  manual,  2nd
       edition, Addison-Wesley, (ISBN 0-201-18127-4).



GMT4.0                            1 Oct 2004                          pslib(l)

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