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+#!/bin/sh -
+#
+# $Id: tpic2pdftex,v 1.94 2007/01/14 19:05:32 hahe Exp $
+#
+# Experimental awk-script for conversion of tpic \specials as produced
+# by (groff-)pic into pdfTeX \pdfliteral sections for further processing
+# by pdftex.
+#
+# Usage:
+# $ pic -t somefile.pic | tpic2pdftex > somefile.tex
+#
+# Process somefile.tex by pdftex/pdflatex.
+#
+# tpic \special desciption see e. g.:
+# Goossens, Rahtz, Mittelbach: The LaTeX Graphics Companion,
+# Addison-Wesley, 1997, pp. 464.
+#
+# Bugs:
+# Spline curve shapes not fully authentic (unknown algorithm).
+# Bounding box does not care for line thickness (groff pic feature).
+# Splines might be outside bounding box.
+#
+# Copyright (C) 2002--2004 by Hartmut Henkel
+#
+# This program 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 program 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 program; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+# The author may be contacted via the e-mail address
+#
+# hartmut_henkel@gmx.de
+#
+# NEWS:
+# 14 Jan. 2007 - make it executable shell script, calling awk
+# 16 Dec. 2004 - Replaced // {print} by {print} (some AWKs did choke)
+# 09 Apr. 2004 - Locale check: Decimal point in float numbers?
+# 30 Oct. 2003 - Replaced print statements by printf to avoid
+# underflow numbers like 1e-14 in \pdfliterals. Remove trailing
+# zeroes of floating point numbers.
+# 02 May 2003 - Lines starting with \ allow TeX insertions,
+# e. g. of pdfTeX \pdfliteral{}
+# 29 Apr. 2003 - Changed for pic of groff 1.19
+# 16 Mar. 2003 - Bug corrected: Dashed lines shorter than minimum
+# dash-pause length now drawn solid.
+# 11 Nov. 2002 - Spline drawing improved: First half of first and last
+# half of last spline segments are drawn by straight lines.
+# 28 Nov. 2002 - Arc and circle drawing cleaned up. Full circle is now
+# drawn by 4 Bezier curves, as is common use. Arcs split evenly into
+# Bezier curves, to minimize max. error.
+# 02 Dec. 2002 - Experimental pic (groff > 1.18.1) with improved
+# vertical picture positioning supported.
+# 04 Dec. 2002 - Experiment with modified pic (\vtop -> \vbox),
+# Formula for Bezier constant c reduced.
+#
+########################################################################
+
+AWK=${AWK:-gawk}
+export LANG="C"
+
+AWKPROG='
+# begin of awk input file
+
+function qprintf(a) {
+ gsub(/0* /," ", a); # trailing zeroes in %f
+ gsub(/\. /," ", a); # orphaned decimal dots
+ gsub(/0*]/,"]", a); # trailing zeroes in brackets
+ gsub(/0X/,"0", a); # guard integer zeroes
+ gsub(/-0 /,"0 ", a); # correct -0 to 0
+ print a;
+}
+
+function startpdfliteral() {
+ if (pdfliteral == 0) {
+ print "\\pdfliteral{";
+ printf("q [] 0 d %d J %d j\n", linecap, linejoin); # no qprintf!
+ qprintf(sprintf("%f w", linethickness * wscale));
+ }
+ pdfliteral = 1;
+}
+
+function stoppdfliteral() {
+ if (pdfliteral == 1) {
+ print "Q";
+ print "}%";
+ }
+ pdfliteral = 0;
+}
+
+########################################################################
+
+BEGIN{
+ wscale = 72.0 / 1000;
+ tpicmode = 0;
+ pdfliteral = 0;
+ pointbuf = 0;
+ filled = 0;
+ fillval = 0;
+ linecap = 1;
+ linejoin = 1;
+ defaultlinethickness = 8;
+ drawarc = 0;
+ pi = atan2(0, -1);
+ if (match(sprintf("%f", 0.5), /\./) == 0) {
+ print "ERROR: Floating point numbers miss decimal point. Do"
+ print " export LANG=\"C\""
+ print "before calling awk."
+ print "ERROR: Floating point numbers miss decimal point. Do" > "/dev/stderr"
+ print " export LANG=\"C\"" > "/dev/stderr"
+ print "before calling awk." > "/dev/stderr"
+ exit 1;
+ }
+}
+
+########################################################################
+
+# the following expression triggers tpic processing for pic <= 1.18.1
+
+/^\\setbox\\graph=\\vtop{/ {
+ pdfliteral = 0;
+ tpicmode = 1;
+ linethickness = defaultlinethickness;
+}
+
+# the following expression triggers tpic processing for pic = 1.19
+
+/^\\expandafter\\setbox\\csname graph\\endcsname/ {
+ pdfliteral = 0;
+ tpicmode = 1;
+ linethickness = defaultlinethickness;
+}
+
+# TeX parts end \pdfliteral, and also TeX parts embedded in .PS ... .PE
+# section end \pdfliteral
+
+/^ *\\graphtemp|^ *\\rlap|^ *\\advance|^\\|^ *\\hbox/ {
+ if(tpicmode == 1)
+ stoppdfliteral();
+}
+
+/^}%/ {
+ if(tpicmode == 1)
+ tpicmode = 0;
+}
+
+########################################################################
+
+# all specials handling
+
+/^ *\\special/ {
+ if(tpicmode == 1)
+ startpdfliteral();
+}
+
+# <pn> set pen size
+
+/^ *\\special{pn/ {
+ gsub(/[{}]/, " ");
+ linethickness = $3 + 0;
+ qprintf(sprintf("%f w", linethickness * wscale));
+ next;
+}
+
+# <pa> add point to path
+
+/^ *\\special{pa/ {
+ gsub(/[{}]/, " ");
+ x[pointbuf] = $3 + 0;
+ y[pointbuf] = $4 + 0;
+ pointbuf++;
+ next;
+}
+
+# <fp> print path as straight lines
+
+/^ *\\special{fp/ {
+ if (filled == 1)
+ qprintf(sprintf("q %f g", 1 - fillval));
+ qprintf(sprintf("%f %f m", x[0] * wscale, -y[0] * wscale));
+ for (i = 1; i < pointbuf; i++)
+ qprintf(sprintf("%f %f l", x[i] * wscale, -y[i] * wscale));
+ if (filled == 1)
+ print "B Q";
+ else
+ print "S";
+ pointbuf = 0;
+ filled = 0;
+ next;
+}
+
+# <da> print path as straight dashed lines
+
+/^ *\\special{da/ {
+ gsub(/[{}]/, " ");
+ don = ($3 + 0) * 1000;
+ if (filled == 1) {
+ qprintf(sprintf("q %f g", 1 - fillval));
+ qprintf(sprintf("%f %f m", x[0] * wscale, -y[0] * wscale));
+ for (i = 1; i < pointbuf; i++)
+ qprintf(sprintf("%f %f l", x[i] * wscale, -y[i] * wscale));
+ print "f Q";
+ }
+ for (i = 1; i < pointbuf; i++) {
+ dx = x[i] - x[i - 1];
+ dy = y[i] - y[i - 1];
+ len = sqrt(dx * dx + dy * dy);
+ non = int(0.5 * len / don + 0.75);
+ noff = non - 1;
+ lon = don * non;
+ loff = len - lon;
+ if(noff > 0) {
+ doff = loff / noff;
+ qprintf(sprintf("q [%f %f] 0X d", don * wscale, doff * wscale));
+ } else {
+ print "q [] 0 d";
+ }
+ qprintf(sprintf("%f %f m", x[i - 1] * wscale, -y[i - 1] * wscale));
+ qprintf(sprintf("%f %f l", x[i] * wscale, -y[i] * wscale));
+ print "S Q";
+ }
+ pointbuf = 0;
+ filled = 0;
+ next;
+}
+
+# <dt> print path as straight dotted lines
+
+/^ *\\special{dt/ {
+ gsub(/[{}]/, " ");
+ dt = ($3 + 0) * 1000;
+ if (filled == 1) {
+ qprintf(sprintf("q %f g", 1 - fillval));
+ qprintf(sprintf("%f %f m", x[0] * wscale, -y[0] * wscale));
+ for (i = 1; i < pointbuf; i++)
+ qprintf(sprintf("%f %f l", x[i] * wscale, -y[i] * wscale));
+ print "f Q";
+ }
+ for (i = 1; i < pointbuf; i++) {
+ dx = x[i] - x[i - 1];
+ dy = y[i] - y[i - 1];
+ len = sqrt(dx * dx + dy * dy);
+ dl = int (len / dt + 0.5);
+ if (!dl)
+ dtl = len;
+ else
+ dtl = len / dl;
+ qprintf(sprintf("q [0X %f] 0X d", dtl * wscale));
+ qprintf(sprintf("%f %f m", x[i - 1] * wscale, -y[i - 1] * wscale));
+ qprintf(sprintf("%f %f l", x[i] * wscale, -y[i] * wscale));
+ print "S Q";
+ }
+ pointbuf = 0;
+ filled = 0;
+ next;
+}
+
+# <ip> like <fp>, but path actually not drawn
+
+/^ *\\special{ip/ {
+ if (filled == 1)
+ qprintf(sprintf("q %f g", 1 - fillval));
+ qprintf(sprintf("%f %f m", x[0] * wscale, -y[0] * wscale));
+ for (i = 1; i < pointbuf; i++)
+ qprintf(sprintf("%f %f l", x[i] * wscale, -y[i] * wscale));
+ if (filled == 1)
+ print "f Q";
+ else
+ print "f";
+ pointbuf = 0;
+ filled = 0;
+ next;
+}
+
+# <sp> like <fp>, but path printed as splines
+
+/^ *\\special{sp/ {
+ gsub(/[{}]/, " ");
+ don = ($3 + 0) * 1000;
+ a = 0.68; # fudge, visually optimized
+ x[pointbuf] = x[pointbuf - 1];
+ y[pointbuf] = y[pointbuf - 1];
+
+ if (don > 0)
+ qprintf(sprintf("q [%f] 0X d", don * wscale));
+ if (don < 0)
+ qprintf(sprintf("q [0X %f] 0X d", -don * wscale));
+
+ qprintf(sprintf("%f %f m", x[0] * wscale, -y[0] * wscale));
+
+ if(pointbuf < 3)
+ qprintf(sprintf("%f %f l", x[pointbuf - 1] * wscale, -y[pointbuf - 1] * wscale));
+ else {
+ qprintf(sprintf("%f %f l", 0.5 * (x[0] + x[1]) * wscale, \
+ -0.5 * (y[0] + y[1]) * wscale)); # start straight, see cstr116.ps
+ for (i = 1; i < pointbuf - 1; i++)
+ qprintf(sprintf("%f %f %f %f %f %f c", \
+ (a * x[i] + (1 - a) * 0.5 * (x[i] + x[i - 1])) * wscale, \
+ -(a * y[i] + (1 - a) * 0.5 * (y[i] + y[i - 1])) * wscale, \
+ (a * x[i] + (1 - a) * 0.5 * (x[i] + x[i + 1])) * wscale, \
+ -(a * y[i] + (1 - a) * 0.5 * (y[i] + y[i + 1])) * wscale, \
+ 0.5 * (x[i] + x[i + 1]) * wscale, -0.5 * (y[i] + y[i + 1]) * wscale));
+ qprintf(sprintf("%f %f l", x[pointbuf - 1] * wscale, -y[pointbuf - 1] * wscale));
+ }
+ if (filled == 1) {
+ qprintf(sprintf("q %f g", 1 - fillval));
+ print "B Q";
+ }
+ else
+ print "S";
+ if (don != 0)
+ print "Q";
+ pointbuf = 0;
+ filled = 0;
+ next;
+}
+
+# <sh> prepare shading of object interior
+
+/^ *\\special{sh/ {
+ gsub(/[{}]/, " ");
+ fillval = $3 + 0;
+ filled = 1;
+ next;
+}
+
+# <ar> draw arc
+# <ia> like <ar>, but arc actually not drawn
+
+/^ *\\special{ar/ {
+ drawarc = 1;
+}
+
+/^ *\\special{ar|^ *\\special{ia/ {
+ gsub(/[{}]/, " ");
+ xc = $3 + 0;
+ yc = $4 + 0;
+ rx = $5 + 0;
+ ry = $6 + 0;
+ s = $7 + 0;
+ e = $8 + 0;
+ if (e - s > 2 * pi) e = s + 2 * pi;
+ if (s - e > 2 * pi) e = s - 2 * pi;
+ curvespercircle = 4; # max. number Bezier curves per circle
+ phi_max = 1.001 * 2 * pi / curvespercircle;
+ if (e > s)
+ imax = int ((e - s) / phi_max) + 1;
+ else
+ imax = int ((s - e) / phi_max) + 1;
+ phi = (e - s) / imax;
+
+ # parameter for Bezier control vectors, c(90 deg.) = 0.55228...:
+ c = 4 * (1 - cos(0.5 * phi)) / (3 * sin(0.5 * phi));
+
+ x0 = rx * cos(s) + xc;
+ y0 = ry * sin(s) + yc;
+ qprintf(sprintf("%f %f m", x0 * wscale, -y0 * wscale));
+ for (i = 0; i < imax; i++) {
+ x1 = x0 - rx * c * sin(s + i * phi);
+ y1 = y0 + ry * c * cos(s + i * phi);
+ x3 = rx * cos(s + (i + 1) * phi) + xc;
+ y3 = ry * sin(s + (i + 1) * phi) + yc;
+ x2 = x3 + rx * c * sin(s + (i + 1) * phi);
+ y2 = y3 - ry * c * cos(s + (i + 1) * phi);
+ qprintf(sprintf("%f %f %f %f %f %f c", x1 * wscale, -y1 * wscale, \
+ x2 * wscale, -y2 * wscale, x3 * wscale, -y3 * wscale));
+ x0 = x3;
+ y0 = y3;
+ }
+ if(drawarc == 1) {
+ if (filled == 1) {
+ qprintf(sprintf("h q %f g", 1 - fillval));
+ print "B Q";
+ }
+ else
+ print "S";
+ } else {
+ if (filled == 1) {
+ qprintf(sprintf("h q %f g", 1 - fillval));
+ print "f Q";
+ }
+ else
+ print "f";
+ }
+ filled = 0;
+ drawarc = 0;
+ next;
+}
+
+########################################################################
+
+{print}
+
+########################################################################
+'
+# end of awk input file
+
+$AWK "$AWKPROG" "$@"