awk script tpic2pdftex

git-svn-id: svn://tug.org/texlive/trunk@3470 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 408 insertions, 0 deletions

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+#!/bin/sh -
+#
+# $Id: tpic2pdftex,v 1.93 2007/01/14 13:55:43 hahe Exp hahe $
+#
+# Experimental awk-script for conversion of tpic \specials as produced
+# by (groff-)pic into pdfTeX \pdfliteral sections for further processing
+# by pdftex.
+#
+# Usage:
+#   $ export LANG="C"
+#   $ 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 "$AWKPROG" "$@"