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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 "$AWKPROG" "$@"
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