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<title>PSLIB</title>
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<h1 align=center>PSLIB</h1>
<a href="#NAME">NAME</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#FUNCTION CALLS">FUNCTION CALLS</a><br>
<a href="#AUTHOR">AUTHOR</a><br>
<a href="#BUGS">BUGS</a><br>
<a href="#REFERENCES">REFERENCES</a><br>
<hr>
<a name="NAME"></a>
<h2>NAME</h2>
<p style="margin-left:11%; margin-top: 1em">pslib 4.3
− A <i>PostScript</i> based plotting library</p>
<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
<p style="margin-left:11%; margin-top: 1em"><b>pslib</b>
was created to make the generation of <i>PostScript</i> page
description code easier. It is a library that contains a
series of tools that can be used to create plots. The
resulting <i>PostScript</i> 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. <b>pslib</b> 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 program with pslib.a. <b>pslib</b> is the core of
the <b><A HREF="GMT.html">GMT</A></b> graphics programs. <b>pslib</b> output
conforms to the Adobe Encapsulated <i>PostScript</i> 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.</p>
<p style="margin-left:11%; margin-top: 1em">Before any
<b>pslib</b> calls can be issued, the plotting system must
be initialized. This is done by calling <b>ps_plotinit</b>
(or <b>ps_plotinit_hires</b>), which defines macros, sets up
the plot-coordinate system, scales, and [optionally] opens a
file where all the <i>PostScript</i> code will be written.
Normally, the plot code is written to <i>stdout</i>. 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
<b>ps_plotend</b>.</p>
<p style="margin-left:11%; margin-top: 1em"><b>pslib</b>
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. <b>pslib</b> uses highly
optimized 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.</p>
<p style="margin-left:11%; margin-top: 1em">A wide variety
of output devices that support <i>PostScript</i> exist,
including laserwriters (color or monochrome) and
workstations running <i>PostScript</i> based window systems
like Sun’s 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 <i>PostScript</i> on a Versatec and other
non-<i>PostScript</i> raster devices. Regular Sun
rasterfiles created under NeWS from <i>PostScript</i> files
can be sent to a variety of color hardcopy units. Check the
devices available on your network.</p>
<p style="margin-left:11%; margin-top: 1em">The
<b>pslib</b> is now fully 64-bit compliant. However, only a
few function parameters are affected by this (such as the
number of point in an array which can now be a 64-bit
integer). These few parameters are here given the type
<b>long</b> to distinguish them from <b>int</b>. Note that
under standard 32-bit compilation they are equivalent. Users
of this library under 64-bit mode must make sure they pass
proper <b>long</b> variables (under Unix flavors) or
<b>__int64</b> under Windows 64.</p>
<a name="FUNCTION CALLS"></a>
<h2>FUNCTION CALLS</h2>
<p style="margin-left:11%; margin-top: 1em">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 <b>double</b> (i.e., 8
bytes), whereas all integers are assumed to be 4 bytes long.
All plotting functions are declared as functions returning
an int. Currently, the return value is undefined.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_arc</b> (<i>x, y, radius, angle1, angle2, status</i>)
<b><br>
double</b> <i>x, y, radius, angle1, angle2</i>; <b><br>
int</b> <i>status</i>;</p>
<p style="margin-left:26%;">Draws a circular arc centered
on (<i>x,y</i>) from angle <i>angle1</i> to <i>angle2</i>.
Angles must be given in decimal degrees. If angle1 >
angle2, a negative arc is drawn. <i>status</i> 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.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_axis</b> (<i>xpos, ypos, length, startval, stopval,
tickval, label, annotpointsize, side</i>) <b><br>
double</b> <i>xpos, ypos, length, startval, stopval,
tickval</i>; <b><br>
double</b> <i>annotpointsize, side</i>; <b><br>
char</b> <i>*label</i>;</p>
<p style="margin-left:26%;">Plots an axis with tickmarks,
annotation, and label. <i>xpos, ypos</i>, and <i>length</i>
are in inches (or cm or meters), <i>annotpointsize</i> in
points (72 points = 1 inch), else data units are used.
<i>side</i> 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 * <i>annotpointsize</i>.
A negative <i>tickval</i> will reverse the sense of positive
direction, e.g., to have the y-axis be positive down.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_bitimage</b> (<i>xpos, ypos, xlength, ylength, buffer,
nx, ny, invert, f_rgb, b_rgb</i>) <b><br>
double</b> <i>xpos, ypos, xlength, ylength</i>; <b><br>
unsigned char</b> <i>buffer[]</i>; <b><br>
int</b> <i>nx, ny, invert, f_rgb[3], b_rgb[3]</i>;</p>
<p style="margin-left:26%;">Plots a 1-bit image using the
given foreground color <i>f_rgb</i> and background color
<i>b_rgb</i>. Specify position of lower left corner and size
(in inches) of image. <i>buffer</i> is an unsigned character
array with 8 pixels per byte. <i>nx,ny</i> refers to the
number of pixels in image. The rowlength of <i>buffer</i>
must be an integral number of 8. <i>buffer</i>[0] is upper
left corner. <i>buffer</i> values are stored as columns,
starting at the lower left corner and ending at the upper
right corner. If <i>invert</i> is 0 then the bits that are 1
are painted with the foreground color, while bits that are 0
are painted with the backgound color. If <i>invert</i> is 1,
foreground and background are switched. To get a partly
transparent image, set the first index of the foreground or
background color to -1, i.e. f_rgb[0]=-1 or b_rgb[0]=1. See
the Adobe Systems <i>PostScript</i> Reference Manual for
more details.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_circle</b> (<i>xcenter, ycenter, diameter, rgb,
outline</i>) <b><br>
double</b> <i>xcenter, ycenter, diameter</i>; <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Plots a circle and fills it
with the specified color. If <i>outline</i> == 1, the
outline will be drawn using current pen-width and
-pattern.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_clipoff</b> ()</p>
<p style="margin-left:26%;">Resets the clip path to what it
was before the last call to <b>ps_clipon</b>.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_clipon</b> (<i>xarray, yarray, npoints, rgb, flag</i>)
<b><br>
double</b> <i>xarray[], yarray[]</i>; <b><br>
long</b> <i>npoints</i>; <b><br>
int</b> <i>rgb[3], flag</i>;</p>
<p style="margin-left:26%;">Sets up a user-definable clip
path. Plotting outside this polygon will be clipped until
<b>ps_clipoff</b> is called. If <i>red</i> >= 0 the
inside of the path is filled with the specified color.
<i>flag</i> is used to create complex clip paths consisting
of several disconnected regions, and takes on values 0-3.
<i>flag</i> = 1 means this is the first path in a
multi-segment clip path. <i>flag</i> = 2 means this is the
last segment. Thus, for a single path, <i>flag</i> = 3.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_colorimage</b> (<i>xpos, ypos, xlength, ylength,
buffer, nx, ny, depth</i>) <b><br>
double</b> <i>xpos, ypos, xlength, ylength</i>; <b><br>
unsigned char</b> <i>buffer[]</i>; <b><br>
int</b> <i>nx, ny, depth</i>;</p>
<p style="margin-left:26%;">Plots a 1-, 2-, 4-, 8-, or
24-bit deep image. This functions sets up a call to the
<i>PostScript</i> colorimage or image operators. <i>xpos,
ypos, xlength, ylength</i> specify the position of lower
left corner and size (in inches) of image. The pixel values
are stored in <i>buffer</i>, an unsigned character array in
scanline orientation with gray shade or r/g/b values (0 -
255) where 0 is black, 255 is white. <i>buffer[0]</i> is
upper left corner. <i>depth</i> is number of bits per pixel
(24, 8, 4, 2, or 1). <i>nx,ny</i> refers to the number of
pixels in image. The rowlength of <i>buffer</i> must be an
integral number of 8/<i>depth</i>. E.g. if <i>depth</i> = 4,
then <i>buffer[j]</i>/16 gives shade for pixel[2j-1] and
<i>buffer[j]</i>%16 (mod 16) gives shade for pixel[2j]. When
<i>-depth</i> is passed instead then "hardware"
interpolation of the image is requested. If <i>-nx</i> is
passed with 8- or 24-bit images then the first one or three
bytes of <i>buffer</i> holds the gray or r/g/b color for
pixels that are to be masked out using the <i>PostScript</i>
Level 3 Color Mask method. See the Adobe Systems
<i>PostScript</i> Reference Manual for more details.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_colortiles</b> (<i>x0, y0, xlength, ylength, buffer,
nx, ny</i>) <b><br>
double</b> <i>x0, y0, xlength, ylength</i>; <b><br>
int</b> <i>nx, ny</i>; <b><br>
unsigned char</b> <i>buffer[]</i>;</p>
<p style="margin-left:26%;">Plots a true color image based
on individual color tiles. <i>x0, y0</i> is the location of
the lower left corner of the image in inches. <i>xlength,
ylength</i> is the image size in inches. <i>buffer</i>
contains rgb triplets stored as rgbrgbrgb... <i>nx, ny</i>
is the image size in pixels.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_command</b> (<i>text</i>) <b><br>
char</b> <i>*text</i>;</p>
<p style="margin-left:26%;">Writes a raw <i>PostScript</i>
command to the <i>PostScript</i> output file, e.g. "1
setlinejoin".</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_comment</b> (<i>text</i>) <b><br>
char</b> <i>*text</i>;</p>
<p style="margin-left:26%;">Writes a comment (<i>text</i>)
to the <i>PostScript</i> output file, e.g. "Start of
graph 2".</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_cross</b> (<i>xcenter, ycenter, diameter</i>) <b><br>
double</b> <i>xcenter, ycenter, diameter</i>;</p>
<p style="margin-left:26%;">Plots a cross (x) at the
specified point using current pen-width and -pattern that
fits inside a circle of given diameter. No fill
possible.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_diamond</b> (<i>xcenter, ycenter, diameter, rgb,
outline</i>) <b><br>
double</b> <i>xcenter, ycenter, diameter</i>; <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Plots a diamond and fills it
with the specified color. If <i>outline</i> == 1, the
outline will be drawn using current pen-width and -pattern.
The symbol will fit inside a circle of given diameter.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_ellipse</b> (<i>xcenter, ycenter, angle, major, minor,
rgb, outline</i>) <b><br>
double</b> <i>xcenter, ycenter, angle, major, minor</i>;
<b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Plots a ellipse with its major
axis rotated by <i>angle</i> degrees and fills it with the
specified color. If <i>outline</i> == 1, the outline will be
drawn using current pen-width and -pattern.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_encode_font</b> (<i>font_no</i>) <b><br>
int</b> <i>font_no</i>;</p>
<p style="margin-left:26%;">Will reencode this font using
the current encoding vector if it is not
StandardEncoding.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_epsimage</b> (<i>xpos, ypos, xlength, ylength, buffer,
size, nx, ny, ox, oy</i>) <b><br>
double</b> <i>xpos, ypos, xlength, ylength</i>; <b><br>
unsigned char</b> <i>buffer[]</i>; <b><br>
int</b> <i>size, nx, ny, ox, oy</i>;</p>
<p style="margin-left:26%;">Plots an Encapsulated
<i>PostScript</i> (EPS) image. The EPS file is stored in
<i>buffer</i> and has <i>size</i> bytes. This functions
simply includes the image in the <i>PostScript</i> output
stream within an appropriate wrapper. Specify position of
lower left corner and size (in inches) of image.
<i>nx,ny,ox,oy</i> refers to the width, height and origin
(lower left corner) of the BoundingBox.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_flush</b> ()</p>
<p style="margin-left:26%;">Flushes the output buffer.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_hexagon</b> (<i>xcenter, ycenter, diameter, rgb,
outline</i>) <b><br>
double</b> <i>xcenter, ycenter, diameter</i>; <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Plots a hexagon and fills it
with the specified color. If <i>outline</i> == 1, the
outline will be drawn using current pen-width and -pattern.
The symbol will fit inside a circle of given diameter.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_image</b> (<i>xpos, ypos, xlength, ylength, buffer,
nx, ny, bits</i>) <b><br>
double</b> <i>xpos, ypos, xlength, ylength</i>; <b><br>
unsigned char</b> <i>buffer[]</i>; <b><br>
int</b> <i>nx, ny, bits</i>;</p>
<p style="margin-left:26%;">Obsolete, simply passes
arguments to <b>ps_colorimage</b>.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_imagefill</b> (<i>x, y, n, image, imagefile, invert,
dpi, outline, f_rgb, b_rgb</i>) <b><br>
double</b> <i>x[], y[], x0, y0</i>; <b><br>
int</b> <i>n, image, invert, dpi, outline, f_rgb[3],
b_rgb[3]</i>; <b><br>
char</b> <i>imagefile</i>;</p>
<p style="margin-left:26%;">Similar to <b>ps_polygon</b>,
but fills the area with an image pattern rather than a color
or grayshade. <i>x</i> and <i>y</i> hold the arrays of
<i>n</i> points. 90 predefined patterns are available (See
<b><A HREF="GMT.html">GMT</A></b> Appendix E). <i>image</i> gives the image number
(1-90). If set to 0, <i>imagefile</i> must be the name to
the user’s image, which must be stored as a Sun 1-,
8-, or 24-bit rasterfile. <br>
1-bit images only: (i) The set pixels (1) are colored using
the RGB combination in <i>f_rgb</i>, while the unset pixels
(0) are painted with <i>b_rgb</i>. Set the f_rgb[0] to -1 to
make set pixels transparent. Set b_rgb[0] to -1 to make the
unset pixels transparent. (ii) If <i>invert</i> is TRUE (1),
the set and unset pixels are interchanged before plotting.
<br>
The unit size of the image is controlled by <i>dpi</i> (in
dots-per-inch). If set to zero, the image is plotted at the
device resolution. If <i>outline</i> is TRUE, the current
penwidth is used to draw the polygon outline.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_itriangle</b> (<i>xcenter, ycenter, diameter, rgb,
outline</i>) <b><br>
double</b> <i>xcenter, ycenter, diameter</i>; <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Plots an inverted and fills it
with the specified color. If <i>outline</i> == 1, the
outline will be drawn using current pen-width and -pattern.
The symbol will fit inside a circle of given diameter.</p>
<p style="margin-left:22%; margin-top: 1em">long
<b>ps_line</b> (<i>xarray, yarray, npoints, type, close,
dummy</i>) <b><br>
double</b> <i>xarray[], yarray[]</i>; <b><br>
long</b> <i>npoints</i>; <b><br>
int</b> <i>type, close, dummy</i>;</p>
<p style="margin-left:26%;">Draw a continuous line from the
positions in the x-y arrays. If <i>close</i> == 1, the first
and last point will automatically be closed by the
<i>PostScript</i> driver. If this is the first segment in a
multi-segment path, set <i>type</i> == 1. To end the
segments and have the line(s) drawn, set <i>type</i> == 2.
Thus, for a single segment, <i>type</i> must be 3. The line
is drawn using the current penwidth. The <i>dummy</i> is an
obsolete parameter no longer used internally.</p>
<p style="margin-left:22%; margin-top: 1em">unsigned char
<b>*ps_load_image</b> (<i>fp, header</i>) <b><br>
FILE</b> <i>*fp</i>; <b><br>
struct imageinfo</b> <i>*header</i>;</p>
<p style="margin-left:26%;">Reads the image contents of the
EPS file or Sun rasterfile pointed to by the open
filepointer <i>fp</i>. The routine can handle Encapsulated
<i>PostScript</i> files or 1-, 8-, 24-, or 32-bit
rasterfiles in old, standard, run-length encoded, or
RGB-style Sun format.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_octagon</b> (<i>xcenter, ycenter, diameter, rgb,
outline</i>) <b><br>
double</b> <i>xcenter, ycenter, diameter</i>; <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Plots a octagon and fills it
with the specified color. If <i>outline</i> == 1, the
outline will be drawn using current pen-width and -pattern.
The symbol will fit inside a circle of given diameter.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_patch</b> (<i>xarray, yarray, npoints, rgb,
outline</i>) <b><br>
double</b> <i>xarray[], yarray[]</i>; <b><br>
long</b> <i>npoints</i>; <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Identical to <b>ps_polygon</b>
except polygon must be < 20 points long and there will be
no attempt to shorten the path by discarding unnecessary
intermediate points along straight segments. Primarily used
when painting large number of small polygons and not waste
output space. If more than 20 points are given we pass the
buck to <b>ps_polygon</b>.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_pentagon</b> (<i>xcenter, ycenter, diameter, rgb,
outline</i>) <b><br>
double</b> <i>xcenter, ycenter, diameter</i>; <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Plots a pentagon and fills it
with the specified color. If <i>outline</i> == 1, the
outline will be drawn using current pen-width and -pattern.
The symbol will fit inside a circle of given diameter.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_pie</b> (<i>xcenter, ycenter, radius, azimuth1,
azimuth2, rgb, outline</i>) <b><br>
double</b> <i>xcenter, ycenter, radius, azimuth1,
azimuth2</i>; <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Plots a sector of a circle and
paints it with the specified RGB combination. If
<i>outline</i> == 1, the outline will be drawn using current
pen-width and -pattern.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_plot</b> (<i>xabs, yabs, kpen</i>) <b><br>
double</b> <i>xabs, yabs</i>; <b><br>
int</b> <i>kpen;</i></p>
<p style="margin-left:26%;">Absolute move (<i>kpen</i>=3)
or draw (<i>kpen=</i>2), using current linewidth. Use
(<i>kpen=</i>-2) to make sure the line is stroked.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_plotend</b> (<i>last_page</i>) <b><br>
int</b> <i>last_page</i>;</p>
<p style="margin-left:26%;">Terminates the plotting
sequence and closes plot file (if other than <i>stdout</i>).
If <i>last_page</i> == 1, then a <i>PostScript</i> showpage
command is issued, which initiates the printing process on
hardcopy devices.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_plotinit</b> (<i>plotfile, overlay, mode, xoff, yoff,
xscl, yscl, ncopies, dpi, unit, pagesize, rgb, encoding,
eps</i>) <b><br>
char</b> <i>*plotfile, *encoding;</i> <b><br>
int</b> <i>overlay, mode, ncopies, dpi, unit</i>; <b><br>
double</b> <i>xoff, yoff, xscl, yscl</i>; <b><br>
int</b> <i>pagesize[2], rgb[3]</i>; <b>struct EPS *</b>
<i>eps</i>;</p>
<p style="margin-left:26%;">Initializes the plotting. If
<i>plotfile</i> == NULL (or ""), then output is
sent to <i>stdout</i>, else output is sent to
<i>plotfile</i>. <i>overlay</i> should be 1 only if you plan
to append it to some existing <i>PostScript</i> file.
<i>mode</i> contains three flags in the three lowest bits.
The lowest bit controls the plot orientation 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 <b><A HREF="GMT.html">GMT</A></b> 3.4 encoding. To use the
ISOLatin1 encoding set the 5th bit to 1. The third bit
controls the format used to write <i>PostScript</i> 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. <i>xoff,yoff</i> are used to
move the origin from the default position in the lower left
corner. <i>xscl,yscl</i> are used to scale the entire plot
(Usually set to 1.0, 1.0). Set <i>ncopies</i> to get more
than 1 copy. <i>dpi</i> sets the hardcopy resolution in dots
pr units. For optimum plot quality and processing speed,
choose <i>dpi</i> 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. <i>unit</i> 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. <i>pagesize</i> 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 <i>rgb</i> array holds the color of the page (usually
white = 255,255,255). The <i>encoding</i> is the name of a
character encoding 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.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_plotinit_hires</b> (<i>plotfile, overlay, mode, xoff,
yoff, xscl, yscl, ncopies, dpi, unit, pagesize, rgb,
encoding, eps</i>) <b><br>
char</b> <i>*plotfile, *encoding;</i> <b><br>
int</b> <i>overlay, mode, ncopies, dpi, unit, rgb[3]</i>;
<b><br>
double</b> <i>xoff, yoff, xscl, yscl</i>; <b><br>
double</b> <i>pagesize[2]</i>; <b>struct EPS *</b>
<i>eps</i>;</p>
<p style="margin-left:26%;">Same as <b>ps_plotinit</b> but
expects the page size to be given in double precision
points.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_plotr</b> (<i>xrel, yrel, kpen</i>) <b><br>
double</b> <i>xrel, yrel</i>; <b><br>
int</b> <i>kpen</i>;</p>
<p style="margin-left:26%;">Move (<i>kpen</i> = 3) or draw
(<i>kpen</i> = 2) relative to current point (see
<b>ps_plot</b>). Use (<i>kpen=</i>-2) to make sure the line
is stroked.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_plus</b> (<i>xcenter, ycenter, diameter</i>) <b><br>
double</b> <i>xcenter, ycenter, diameter</i>;</p>
<p style="margin-left:26%;">Plots a plus (+) at the
specified point using current pen-width and -pattern that
fits inside a circle of given diameter. No fill
possible.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_point</b> (<i>xcenter, ycenter, diameter</i>) <b><br>
double</b> <i>xcenter, ycenter, diameter</i>;</p>
<p style="margin-left:26%;">Plots a point (dot) using
current pen with given diameter. Note the linecap setting
must first be set to 1 for this function to work.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_polygon</b> (<i>xarray, yarray, npoints, rgb,
outline</i>) <b><br>
double</b> <i>xarray[], yarray[]</i>; <b><br>
long</b> <i>npoints</i>; <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Creates a colored polygon from
the positions in the x-y arrays. Polygon will automatically
be closed by the <i>PostScript</i> driver. If <i>outline</i>
== 0, no outline is drawn. If <i>outline</i> == 1, the
outline is drawn using current penwidth.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_rect</b> (<i>x1, y1, x2, y2, rgb, outline</i>) <b><br>
double</b> <i>x1, y1, x2, y2</i>; <br>
int <i>rgb[3], outline;</i></p>
<p style="margin-left:26%;">Plots a colored rectangle.
(<i>x1,y1)</i> and (<i>x2,y2</i>) are any two corners on a
diagonal. If <i>outline</i> == 1, the outline will be drawn
using current pen-width and -pattern.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_rotaterect</b> (<i>x, y, angle, xsize, ysize, rgb,
outline</i>) <b><br>
double</b> <i>x, y, angle, xsize, ysize</i>; <br>
int <i>rgb[3], outline;</i></p>
<p style="margin-left:26%;">Plots a colored rectangle
rotated <i>angle</i> degrees from baseline. (<i>x,y)</i> is
the center and (<i>xsize,ysize</i>) are the dimensions. If
<i>outline</i> == 1, the outline will be drawn using current
pen-width and -pattern.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_rotatetrans</b> (<i>x, y, angle</i>) <b><br>
double</b> <i>x, y, angle</i>;</p>
<p style="margin-left:26%;">Rotates the coordinate system
by <i>angle</i> degrees, then translates origin to
(<i>x,y</i>).</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_segment</b> (<i>x0, y0, x1, y1</i>) <b><br>
double</b> <i>x0, y0, x1, y1;</i></p>
<p style="margin-left:26%;">Draws a line segment between
the two points using current pen attributes.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_setdash</b> (<i>pattern, offset</i>) <b><br>
char</b> <i>*pattern;</i> <b><br>
int</b> <i>offset;</i></p>
<p style="margin-left:26%;">Changes the current
dashpattern. The character string <i>pattern</i> is set to
the desired pattern. E.g., "4 2" and <i>offset</i>
= 1 will plot like:</p>
<p style="margin-left:34%;">x ---- ---- ----</p>
<p style="margin-left:26%;">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 <i>pattern</i> = NULL ("") and
<i>offset</i> = 0. Units are in dpi units.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_setfill</b> (<i>rgb, outline</i>) <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Sets the current fill color and
whether or not outline is needed for symbols.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_setfont</b> (<i>fontnr</i>) <b><br>
int</b> <i>fontnr</i>;</p>
<p style="margin-left:26%;">Changes the current font number
to <i>fontnr</i>. The fonts available 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 = Bookman-Demi, 18 = B.-DemiItalic, 19
= B.-Light, 20 = B.-LightItalic, 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 = ZapfDingbats, 35 = Ryumin-Light-EUC-H, 36 =
Ryumin-Light-EUC-V, 37 = GothicBBB-Medium-EUC-H, and 38 =
GothicBBB-Medium-EUC-V. If <i>fontnr</i> is outside this
range, it is set to 0.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_setformat</b> (<i>n_decimals</i>) <b><br>
int</b> <i>n_decimals</i>;</p>
<p style="margin-left:26%;">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.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_setline</b> (<i>linewidth</i>) <b><br>
int</b> <i>linewidth</i>;</p>
<p style="margin-left:26%;">Changes the current linewidth
in DPI units. 0 gives thinnest line, but the use of 0 is
implementation-dependent (Works fine on most
laserwriters).</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_setlinecap</b> (<i>cap</i>) <b><br>
int</b> <i>cap</i>;</p>
<p style="margin-left:26%;">Changes the current linecap. 0
gives butt cap [Default], 1 gives round, and 2 gives
square.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_setlinejoin</b> (<i>join</i>) <b><br>
int</b> <i>join</i>;</p>
<p style="margin-left:26%;">Changes the current linejoin. 0
gives mitered [Default], 1 gives round, and 2 gives bevel
joins.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_setmiterlimit</b> (<i>limit</i>) <b><br>
int</b> <i>limit</i>;</p>
<p style="margin-left:26%;">Changes the current miter
limit. 0 gives default miter, other values are the cutoff-,
acute- angle when mitering takes place.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_setpaint</b> (<i>rgb</i>) <b><br>
int</b> <i>rgb[3]</i>;</p>
<p style="margin-left:26%;">Changes the current RGB setting
for pens and text.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_square</b> (<i>xcenter, ycenter, diameter, rgb,
outline</i>) <b><br>
double</b> <i>xcenter, ycenter, diameter</i>; <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Plots a square and fills it
with the specified color. If <i>outline</i> == 1, the
outline will be drawn using current pen-width and -pattern.
The symbol will fit inside a circle of given diameter.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_star</b> (<i>xcenter, ycenter, diameter, rgb,
outline</i>) <b><br>
double</b> <i>xcenter, ycenter, diameter</i>; <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Plots a star and fills it with
the specified color. If <i>outline</i> == 1, the outline
will be drawn using current pen-width and -pattern. The
symbol will fit inside a circle of given diameter.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_text</b> (<i>x, y, pointsize, text, angle, justify,
form</i>) <b><br>
double</b> <i>x, y, pointsize, angle</i>; <b><br>
char</b> <i>*text</i>; <b><br>
int</b> <i>justify, form</i>;</p>
<p style="margin-left:26%;">The <i>text</i> is plotted
starting at (<i>x,y</i>), and will make an <i>angle</i> with
the horizontal. The point (<i>x,y</i>) maps onto different
points of the textstring by giving various values for
<i>justify</i>. It is used as follows:</p>
<p style="margin-left:42%; margin-top: 1em">9------------10-----------
11 <br>
| | <br>
5 6 7 <br>
| | <br>
1------------ 2------------ 3</p>
<p style="margin-left:26%;">The box represents the
textstring. E.g., to plot a textstring with its center of
gravity at (<i>x,y</i>), you must use <i>justify</i> == 6.
If <i>justify</i> 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. @%<i>no</i>% sets font to <i>no</i>; @%% 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.
@;<i>r/g/b</i>; changes the font color (@;; resets it),
@:<i>size</i>: changes the font size (@:: resets it), and @_
toggles underline on/off. Give fontsize in points (72 points
= 1 inch). Normally, the text is typed using solid
characters. To draw outline characters, set <i>form</i> ==
1. If <i>pointsize</i> is negative it means that the current
point has already been set before <b>ps_text</b> was called
and that (<i>x,y</i>) should be ignored.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_textbox</b> (<i>x, y, pointsize, text, angle, justify,
outline, dx, dy, rgb</i>) <b><br>
double</b> <i>x, y, angle, pointsize, dx, dy</i>; <b><br>
char</b> <i>*text</i>; <b><br>
int</b> <i>justify, outline, rgb[3]</i>;</p>
<p style="margin-left:26%;">This function is used in
conjugation with <b>ps_text</b> when a box surrounding the
text string is desired. Taking most of the arguments of
<b>ps_text</b>, 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 <i>dx</i> and <i>dy</i> accordingly.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_transrotate</b> (<i>x, y, angle</i>) <b><br>
double</b> <i>x, y, angle</i>;</p>
<p style="margin-left:26%;">Translates the origin to
(<i>x,y</i>), then rotates the coordinate system by
<i>angle</i> degrees.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_triangle</b> (<i>xcenter, ycenter, diameter, rgb,
outline</i>) <b><br>
double</b> <i>xcenter, ycenter, diameter</i>; <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Plots a triangle and paints it
with the specified RGB combination. If <i>outline</i> == 1,
the outline will be drawn using current pen-width and
-pattern. The symbol will fit inside a circle of given
diameter.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_vector</b> (<i>xtail, ytail, xtip, ytip, tailwidth,
headlength, headwidth, headshape, rgb, outline</i>) <b><br>
double</b> <i>xtail, ytail, xtip, ytip, tailwidth,
headlength, headwidth, headshape</i>; <b><br>
int</b> <i>rgb[3], outline</i>;</p>
<p style="margin-left:26%;">Draws a vector of size and
appearance as specified by the various parameters.
<i>headshape</i> 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 <i>outline</i> == 1, the outline will be drawn
using current penwidth. Add 8 to <i>outline</i> for a
double-headed vector.</p>
<p style="margin-left:22%; margin-top: 1em">void
<b>ps_words</b> (<i>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_offset, boxpen_rgb, vecpen_width,
vecpen_texture, vecpen_offset, vecpen_rgb, boxfill_rgb</i>)
<b><br>
double</b> <i>x, y, line_space, par_width, angle, x_off,
y_off, x_gap, y_gap</i>; <b><br>
long</b> <i>n_words</i>; <b><br>
int</b> <i>font, font_size, justify, draw_box, boxpen_width,
boxpen_offset</i>; <b><br>
int</b> <i>boxpen_rgb[3], vecpen_width, vecpen_offset,
vecpen_rgb[3], boxfill_rgb[3]</i>; <b><br>
char</b> <i>**text, *boxpen_texture,
*vecpen_texture</i>;</p>
<p style="margin-left:26%;">Typesets paragraphs of text.
<i>text</i> is an array of the words to typeset, using the
given line-spacing and paragraph width. The whole text block
is positioned at <i>x, y</i> which is the anchor point on
the box as indicated by <i>justify</i> (see ps_text). The
whole block is then shifted by <i>x_off, y_off</i>. Inside
the box, text is justified left, centered, right, or
justified as governed by <i>par_just</i> (lcrj).
<i>draw_box</i> 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
<i>x_gap, y_gap</i>, which specifies the padding between the
text and the box, are zero), while the forth bit draws a
line from the original <i>x, y</i> point to the shifted
position. The escape sequences described for ps_text applies
as well.</p>
<a name="AUTHOR"></a>
<h2>AUTHOR</h2>
<p style="margin-left:11%; margin-top: 1em">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.</p>
<a name="BUGS"></a>
<h2>BUGS</h2>
<p style="margin-left:11%; margin-top: 1em">Caveat Emptor:
The author is <b>not</b> responsible for any disasters,
suicide attempts, or ulcers caused by correct <b>or</b>
incorrect use of <b>pslib</b>. 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.</p>
<a name="REFERENCES"></a>
<h2>REFERENCES</h2>
<p style="margin-left:11%; margin-top: 1em">Adobe Systems
Inc., 1990, <i>PostScript</i> language reference manual, 2nd
edition, Addison-Wesley, (ISBN 0-201-18127-4).</p>
<hr>
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