.\" Groff Presentation Macros
.\" date: October 5, 2002
.\" version: 2.0
.\" author: Bob Diertens, <bobd@science.uva.nl>
.ig
    Copyright (C) 2001, 2002  Bob Diertens

    This macro package is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This macro package is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this macro package; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
..
.\"*** Initialisation
.\" depending on present.tmac
.if !r .mpresent \{\
'   tm ERROR: no present macros loaded
.   ab "aborted"
.\}
.nr .mpiclink 1
.\" Defaults
.\" *** PIC Links
.\" usage: LINKPIC x y width height label
.\" x,y is the position of the center of the rectangle
.\" used by piclink
.de LINKPIC
.gp-link@set
.nr gp-linkpic*w (\\$3)
.nr gp-linkpic*h (\\$4)
.nr gp-linkpic*x (\\$1)+\\n[.i]+\\n[.o]-\\n[gp-pic*x1]-(\\n[gp-linkpic*w]/2)
.nr gp-linkpic*y 0-(\\$2)+\\n[nl]-\\n[gp-pic*y2]+1v-(\\n[gp-linkpic*h]/2)
\X'ps: exec %%%%LINK \\n[gp-linkpic*x] \\n[gp-linkpic*y] \\n[gp-linkpic*w] \\n[gp-linkpic*h] \\$5'\c
..
.\" define a macro for PIC
.\" usage: LINK name (box|circle|ellipse)
.PS
define LINK {
command "\!.LINKPIC " $2.c.x "i " $2.c.y "i " $2.wid "i " $2.ht "i $1 $3"
}
.PE
.\" Redefine PS so we can define a new PS that first read a comment-line
.\" left by gpic.
.\" The trick to read a comment-line is to define a macro \" and turning
.\" the escape mechanism off.
.\" The macro \" is created and removed every time a PS is encountered, so
.\" this trick does not process other comments and can be used elsewhere.
.rn PS NEWPS
.de PS
.ds gp-ps*w \\$1
.ds gp-ps*h \\$2
.de \\\\"
.ec
.nr gp-pic*x1 (i;\\\\$1)
.nr gp-pic*y1 (i;\\\\$2)
.nr gp-pic*x2 (i;\\\\$3)
.nr gp-pic*y2 (i;\\\\$4)
.NEWPS \\*[gp-ps*w] \\*[gp-ps*h]
.rm \\\\"
.\"ie d\\\\\\\\" .tm removed
.\"el .tm still there
\\..
.\"ie d\\\\" .tm defined
.\"el .tm not defined
.eo
..