Source Code 1994 March/Source_Code_CD-ROM_Walnut_Creek_March_1994.iso/compsrcs/misc/volume31/plotfoil/part01

Text File | 1992-07-13 | 55.3 KB | 1,621 lines

Newsgroups: comp.sources.misc
From: [e-mail] ("Shamim Zvonko Mohamed")
Subject:  v31i028: plotfoil - Plot curves (airfoils) using PostScript, Part01/03
Message-ID: <csm-v31i028=[e-mail]>
X-Md4-Signature: 6188e82fc3cf6208d15973797431874a
Date: Mon, 13 Jul 1992 21:00:11 GMT
Approved: [e-mail]

Submitted-by: [e-mail] ("Shamim Zvonko Mohamed")
Posting-number: Volume 31, Issue 28
Archive-name: plotfoil/part01
Environment: UNIX,VMS,DOS,SGI,Sun,PC

This is a program that reads in airfoil data and generates PostScript code
that will plot the airfoil on a PS printer. It interpolates between points
and can understand the two most popular formats for airfoil data (sample data
is included). It has various options for chord size, spar locations, sheeting
allowances, and can also do multi-page plots (e.g. chord size > 11 inches).
It has run on every system that I could find with a C compiler. The code
generated has also printed on every PS printer I've tried. The README has
details.

Shamim Mohamed / {uunet,noao,cmcl2..}!arizona!shamim / [e-mail]
---
#! /bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
#        "End of archive 1 (of 3)."
# Contents:  plotfoil plotfoil/COPYING plotfoil/README
#   plotfoil/airfoils plotfoil/makefile plotfoil/makefile.dos
#   plotfoil/makefile.vms plotfoil/plotfoil.1 plotfoil/plotfoil.c
#   plotfoil/spline.c
# Wrapped by sham@gilamonster on Thu Jul  9 14:52:00 1992
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test ! -d 'plotfoil' ; then
    echo shar: Creating directory \"'plotfoil'\"
    mkdir 'plotfoil'
fi
if test -f 'plotfoil/COPYING' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'plotfoil/COPYING'\"
else
echo shar: Extracting \"'plotfoil/COPYING'\" \(18054 characters\)
sed "s/^X//" >'plotfoil/COPYING' <<'END_OF_FILE'
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END_OF_FILE
if test 18054 -ne `wc -c <'plotfoil/COPYING'`; then
    echo shar: \"'plotfoil/COPYING'\" unpacked with wrong size!
fi
# end of 'plotfoil/COPYING'
fi
if test -f 'plotfoil/README' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'plotfoil/README'\"
else
echo shar: Extracting \"'plotfoil/README'\" \(2041 characters\)
sed "s/^X//" >'plotfoil/README' <<'END_OF_FILE'
X
Copyright 1992 Shamim P. Mohamed
X
This is the "plotfoil" package (V2.1) for plotting airfoil sections from data.
It generates PostScript, does interpolation, spars, templates and allowances
for sheeting.  For more info on the formats supported and options, see the
comments in plotfoil.man.  The PostScript generated is quite vanilla, and
should print on any printer. Some printers may run out of memory trying to
print multi-page plots with lots of data. If that happens, recompile plotfoil
with -DSAVEMEM, which may help. Otherwise, your only hope is either find
another printer or try removing some of the input data.
X
The PostScript is sent to standard output. Use redirection or a pipe to send
it to the printer.
X
This program runs on all the Unix platforms I've tried, i.e. Sun3, Sun4
X(SparcStation 1, 1+, 2, LSC, SLX), SGI (personal Iris and 4D systems), NeXT,
Sequent Symmetry, VAX/BSD. It also runs on MS-DOS (AT, PS/2 50, 70, 80; MS C
compiler, Turbo C++) and VMS (VAX, DEC4000). It has worked on the following
printers: Apple LaserWriters (Plus, II and NTX), NEC LC890, LC890XL, HP
LaserJet, QMS PS2000 and PS2200, NeWSprint/SPARCprinter, DEC LN03
Scriptprinter.
X
Please send any changes to me. This program is distributed under the terms of
the Gnu General Public License Version 2 as published by the Free Software
XFoundation. You can give away copies of this program to whoever you like, as
long as you provide them with source code and all the copyright notices and
licences stay with it. Also, if you make any changes to this program, the same
conditions apply to the modified version so that we can all benefit from them.
X(And please send me those changes!) See the file COPYING for more details.
X
X(The airfoil data are not covered by this license; they are in the public
domain)
X
Shamim Mohamed
[e-mail]                      Dept. of Computer Science
X{uunet,cmcl2,noao,...}!arizona!shamim       University of Arizona
May 1992                                Tucson, AZ 85721
X
Voice: [phone]
XFax:   [phone]
END_OF_FILE
if test 2041 -ne `wc -c <'plotfoil/README'`; then
    echo shar: \"'plotfoil/README'\" unpacked with wrong size!
fi
# end of 'plotfoil/README'
fi
if test ! -d 'plotfoil/airfoils' ; then
    echo shar: Creating directory \"'plotfoil/airfoils'\"
    mkdir 'plotfoil/airfoils'
fi
if test -f 'plotfoil/makefile' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'plotfoil/makefile'\"
else
echo shar: Extracting \"'plotfoil/makefile'\" \(329 characters\)
sed "s/^X//" >'plotfoil/makefile' <<'END_OF_FILE'
X#
X# Makefile for plotfoil
X#
X
X#CC = gcc
X#CFLAGS = -g -O
X
CFLAGS = -O
X
plotfoil : plotfoil.o spline.o
X    $(CC) $(CFLAGS) -o plotfoil plotfoil.o spline.o -lm
X
lint :
X    lint plotfoil.c spline.c
X
clean :
X    -rm *.o *~
X    -rm -i plotfoil
X
dist :
X    (cd ..; tar cvf p plotfoil; compress p; uuencode plotfoil.tar.Z <p.Z >plotfoil-2.1)
X    rm ../p.Z
END_OF_FILE
if test 329 -ne `wc -c <'plotfoil/makefile'`; then
    echo shar: \"'plotfoil/makefile'\" unpacked with wrong size!
fi
# end of 'plotfoil/makefile'
fi
if test -f 'plotfoil/makefile.dos' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'plotfoil/makefile.dos'\"
else
echo shar: Extracting \"'plotfoil/makefile.dos'\" \(390 characters\)
sed "s/^X//" >'plotfoil/makefile.dos' <<'END_OF_FILE'
X#
X# Makefile for DOS version of plotfoil
X#
X# This make file is appropriate for Microsoft C Version 6.00A
X# and Microsoft NMAKE.
X#
X# Just type "nmake /f makefile.dos" to build the program.
X#
X# Andrew Patrick, [e-mail]
X
plotfoil.exe : plotfoil.obj spline.obj
X    link +plotfoil+spline,plotfoil;
X
plotfoil.obj: plotfoil.c
X    cl /c plotfoil.c
X
spline.obj: spline.c
X    cl /c spline.c
X
END_OF_FILE
if test 390 -ne `wc -c <'plotfoil/makefile.dos'`; then
    echo shar: \"'plotfoil/makefile.dos'\" unpacked with wrong size!
fi
# end of 'plotfoil/makefile.dos'
fi
if test -f 'plotfoil/makefile.vms' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'plotfoil/makefile.vms'\"
else
echo shar: Extracting \"'plotfoil/makefile.vms'\" \(330 characters\)
sed "s/^X//" >'plotfoil/makefile.vms' <<'END_OF_FILE'
X#
X# Makefile for VMS systems.
X# Harm Munk ([e-mail])
X#
X
plotfoil : plotfoil.obj spline.obj
X        link/exe=plotfoil.exe plotfoil.obj,spline.obj
X
plotfoil.obj : plotfoil.c
X        cc plotfoil
X
spline.obj : spline.c
X        cc spline.c
X
clean :
X        delete/noconfirm/nolog plotfoil.obj;*,spline.obj;*,plotfoil.exe;*
X
END_OF_FILE
if test 330 -ne `wc -c <'plotfoil/makefile.vms'`; then
    echo shar: \"'plotfoil/makefile.vms'\" unpacked with wrong size!
fi
# end of 'plotfoil/makefile.vms'
fi
if test -f 'plotfoil/plotfoil.1' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'plotfoil/plotfoil.1'\"
else
echo shar: Extracting \"'plotfoil/plotfoil.1'\" \(6731 characters\)
sed "s/^X//" >'plotfoil/plotfoil.1' <<'END_OF_FILE'
X.\" plotfoil.1l 2/17/92
X.TH plotfoil 1l "Feb. 1992"
X.SH NAME
X\fBplotfoil\fP \- generate a PostScript plot of airfoil data.
X.SH SYNTAX
X\fBplotfoil\fP [\fIoptions\fP] [\fIfilename...\fP]
X.SH DESCRIPTION
This program plots (in PostScript) airfoil sections (well, actually any section
that is not smoothly closed). It can also allow for spars,
sheeting, and prints registration marks that are aligned with the L.E. and T.E.
It uses Bezier splines to interpolate between
data points, with an option to use straight lines instead.
X.SH OVERVIEW
Plotfoil reads airfoil data and generates PostScript code that when printed on
a PostScript printer will deliver a plot of the airfoil section along with
spars (if any). The bounds of
the section are also drawn, with crosses, and these can be used for
registration of the ribs or templates. If the plot is going to be larger than
one page, it will be spread over as many pages as are required.
X.PP
PostScript is a printer language for describing printed pages. Printers that
accept PostScript include the Apple LaserWriters, QMS PS- series printers,
DataProducts LZR-2665 and 2660 and the Linotronic 100 and 300 typesetters.
PostScript is a trademark of Adobe Systems Incorporated.
X.PP
Bezier splines are used to calculate interpolating curves between the points.
In some case the process may not deliver a smooth curve, and you will
have to use the straight-line plot option (\fB\-s\fP).
X.PP
The program can also account for sheeting. If the wing you are building is to
be sheeted, the ribs you need have to be inset from the required surface
by the thickness of the sheet. When this option is used, you will notice that
two curves are actually plotted. The inner curve is the one to use for ribs.
X(The outer can be used if you are building a jig or saddle that will be
sheeted.) The airfoil
outline is plotted with a dotted line.
X.SH OPTIONS
X.IP \fB\-c\fR
Sets the chord of the section to plot. The argument is the chord, in units of
either mm, cm or inches. The units are specified by a
trailing `m', `c', or `i',
with the default of mm being used if unspecified.
X.IP \fB\-s\fR
This flag indicates that for \fIx\fP values of greater than 2.5%,
straight lines
should be used to join the points. This results in a PostScript file which is
probably just as good but should print in less time. The limit (2.5%) can be
changed with the \fB-l\fP option.
X.IP \fB\-l\fR
This option changes the limit used with the \fB-s\fP option. It takes the
percentage-chord as argument.
X.IP \fB\-i\fR
This option draws the section inset by the specified amount, which is what you
would use if the wing you are building is sheeted. The units default to those
used for the chord.
X.IP \fB\-sp\fP
This option adds a spar to the plot. It takes two arguments, the offset
X(expressed as a percentage of the chord) and the thickness of the spar
X(default units:
same as used for the chord). This option can be used multiple times to
draw more than one spar. Also, 0-thickness spars can be used to draw vertical
lines on the plot.
X.IP \fB\-th\fR
This option sets the height of the template outline, measured from the chord
line. The default is 0.
X.IP \fB\-tl\fR
X.IP \fB\-tt\fR
These options set the horizontal extents of the template. The value specified
is the distance of the edge of the template from the {leading, trailing} edge.
The units default to those specified while setting the chord. The default
value is 0.
X.IP
If any of \fB\-th\fR, \fB\-tl\fR or \fB\-tt\fR is used, a template will be
drawn.
X.IP \fB\-h\fR
Prints some help information.
X.IP \fB\-o\fR
Writes the output to the specified file.
X.SH INPUT FORMATS
There are two formats for input data, distinguished by how coordinates are
specified. The first line of the file is taken to be the name of the section
and is printed along with the plot.
X.PP
All the \fIx\fP values have to be positive, with 0 being the L.E. and the
max value
being the T.E. The \fIx\fP values don't have to be in the range [0, 1] anymore,
but can be [0, \fIa\fP].
X.PP
This is the first format:
X   SD-8020
X   1.0 0
X   0.9 0.011
X   0.85 0.02
X   ...
X   1.0 0
X.br
Note: it starts at \fIx\fP=1.0 (the trailing edge), goes around
and ends again at the
T.E. This is the format used by the sections in Soartech 8.
X.PP
This is the second format:
X   Clark YH
X   0 0 0
X   0.0125 0.0409 -0.0183
X   0.025 .0529 -.0271
X   ...
X   1.0 0 0
X.br
This starts at the L.E. and ends at the T.E., with the columns being the upper
and lower ordinate values. This is the format that most of the NACA sections
were published in.
X.SH EXAMPLES
This command:
X.IP
plotfoil -c 20c -i 2m -sp 32 0.2 sd8020 | lpr
X.LP
will plot the SD-8020 section with a chord of 20cm, with a sheeting allowance
of 2mm, and a spar 2mm wide at 32% chord. The name of the section and the
sheeting allowance are also printed.
X.IP
plotfoil -c 8.5i -i 0.125 -s -l 10 clarkYH | lpr
X.LP
will plot the Clark YH with a chord of 8.5 inches. Only the area from the L.E.
to 10% back will interpolated with splines, and from 10% to the T.E.; straight
lines will be used to connect the points. A sheeting allowance of 0.125" (1/8")
will also be drawn.
X.SH DISTRIBUTION
X\fBplotfoil\fP is free; anyone may redistribute copies of it to anyone
under the terms stated in the Gnu General Public License version 2, a
copy of which should accompany each copy of plotfoil. See the file ``COPYING''
in the source area. If you do not have this file, a copy may be obtained from:
X   Free Software Foundation
X   1000 Mass Ave.
X   Cambridge, MA 02138
X.br
or from the author.
X.LP
Also, if you make any changes to this program and re-distribute it, the same
conditions apply to the modified version so that we can all benefit from
it. And please send me those changes!
X.SH AUTHOR
Shamim Mohamed ([e-mail])
X.br
Dept of Computer Science
X.br
University of Arizona
X.br
Tucson, AZ 85721
X.SH BUGS
On some printers, there may be a stack overflow if the plot is on more than one
page and there are more than a certain number of coordinate values. If this
happens, first try compiling with -DSAVEMEM and run again, then try
X.IP
a) finding another printer, or
X.IP
b) removing some of the airfoil data.
X.LP
In the latter case you may still get satisfactory results because of the
smooth interpolation used.
X.PP
Since the program doesn't know how big the printer page size is, it can get
confused. This should only err conservatively, like producing an extra blank
page on a multi-page plot. As long as the page is higher than about 11 inches
X(27 cm) everything should be fine.
X.PP
I don't know of any other bugs right now,
but please send all bug reports to me. Include
version number and the exact details (input files, command-line options  etc.),
please.
END_OF_FILE
if test 6731 -ne `wc -c <'plotfoil/plotfoil.1'`; then
    echo shar: \"'plotfoil/plotfoil.1'\" unpacked with wrong size!
fi
# end of 'plotfoil/plotfoil.1'
fi
if test -f 'plotfoil/plotfoil.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'plotfoil/plotfoil.c'\"
else
echo shar: Extracting \"'plotfoil/plotfoil.c'\" \(17198 characters\)
sed "s/^X//" >'plotfoil/plotfoil.c' <<'END_OF_FILE'
X/*
X * Copyright 1992 Shamim P. Mohamed
X *
X * This program is free software; you can redistribute it and/or modify
X * it under the terms of the GNU General Public License as published by
X * the Free Software Foundation; either version 2 of the License, or
X * (at your option) any later version.
X *
X * This program is distributed in the hope that it will be useful,
X * but WITHOUT ANY WARRANTY; without even the implied warranty of
X * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
X * GNU General Public License for more details.
X *
X * You should have received a copy of the GNU General Public License
X * along with this program; if not, write to the Free Software
X * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
X *
X * Author:
X * [e-mail]
X * Shamim Mohamed
X * Dept. of Computer Science
X * University of Arizona
X *
X * ---------------------------------------------------------------------------
X *
X * Plots airfoils (or indeed any section)
X * ---------------------------------------------------------------------------
X * There are two formats for input data. Here are examples of each:
X *
X * Input formats:
X *    1 Title
X *    1.0    0
X *    0.9    0.011
X *    0.85    0.02
X *    ...
X *    1.0    0
X * This should start at the trailing edge (x = 1.0), follow a surface to the
X * LE (x = 0), and continue back to the TE (assuming the LE is smooth).
X * Or:
X *    2 Title
X *    0        0    0
X *    .0125    .0409   -.0183
X *    .025    .0529    -.0271
X *    ...
X *    1.0    0    0
X * The values go across the foil from LE (x = 0) to TE (x = 1).
X *
X * Remember: the digit in the first line ("1" or "2") is important!
X *
X * ---------------------------------------------------------------------------
X * Options:
X *    -c : Chord size (trailing c, m or i represents cm, mm or in)
X *    -s : Use straight line approximation for x values > limit
X *    -l : The limit used in -s (default: 0.025)
X *    -i : Draw allowance for sheeting, of i units (units are same as chord)
X *    -t?: Draw template
X *    -spar : Draw spar
X *    -h : help
X *
X * Try: plotfoil -c 200m -i 2 file
X * (means chord = 200mm, with allowance for a 2mm skin)
X *
X */
X
X#include <stdio.h>
X#include <math.h>
X#include <string.h>
X
X#define streq(a, b)   (strcmp((a),(b)) == 0)
X
X#define MAXPOINTS 100
X#define MAX_SPARS  10
X
X/* output scaling etc. */
X#define SCALE  10000       /* size of the field (output)        */
X#define RADIUS    10       /* radius of circles denoting points */
X#define TXTSIZ    20       /* size to be used for text          */
X
static int sflag, iflag, tflag, nsheets, nspars=0;
static float c = 1.0, s_limit = 0.025;
X
extern void interpolate();
X
void init_output(), put_line(), put_curve(), put_title(), end_output(),
X   draw_template(), draw_spar(), end_lines(), draw_double_line(), get_value(),
X   do_scaling(), process();
X
typedef struct {
X   double x, y;
X} point;
X
typedef struct {
X   float raw_value, scale, pts;
X   char *units;
X} value;
X
typedef struct {
X   float offset;
X   value thick;
X} spar_desc;
X
static value
X   chord = {100.0, 2.834, 283.4, "mm"},
X   sheeting = {0.0, 1.0, 0.0, ""},
X   templ_h = {0.0, 1.0, 0.0, ""},
X   templ_le = {0.0, 1.0, 0.0, ""},
X   templ_te = {0.0, 1.0, 0.0, ""};
X
spar_desc spars[MAX_SPARS];
X
static FILE *fout = stdout;
X
main(argc, argv)
int argc;
char *argv[];
X{
X   char *pointfile = "";
X   int ch, i, n, k, qflag=0;
X   char cont, *p;
X   FILE *fp, *get_file();
X   int argp = 1;
X
X   while(argc > argp) {
X      p = argv[argp];
X      if(*p == '-' && *(p+1) != 0) {
X     switch (*(p+1)) {
X     case 'l':
X        sscanf(argv[++argp], "%f", &s_limit);
X        s_limit /= 100.0;
X        break;
X     case 's':
X        if(*(p+2) == 'p') {
X           sscanf(argv[++argp], "%f", &spars[nspars].offset);
X           get_value(argv[++argp], &spars[nspars].thick);
X           spars[nspars].offset /= 100.0;
X           nspars++;
X        }
X        else
X           sflag++;
X        break;
X     case 'q': qflag++; break;
X     case 'i':
X        iflag++;
X        get_value(argv[++argp], &sheeting);
X        break;
X     case 'c':
X        get_value(argv[++argp], &chord);
X        break;
X     case 't':
X        tflag++;
X        switch (*(p+2)) {
X        case 'h':
X           get_value(argv[++argp], &templ_h);
X           break;
X        case 't':
X           get_value(argv[++argp], &templ_te);
X           break;
X        case 'l':
X           get_value(argv[++argp], &templ_le);
X           break;
X        default:
X           break;
X        }
X        break;
X     case 'o':
X        if((fout = fopen(argv[++argp], "w")) == NULL) {
X           fprintf(stderr, "Could not open \"%s\" for writing!\n");
X           fout = stdout;
X        }
X        break;
X     case '-':
X        goto done_opts;
X     default:
X        fprintf(stderr,
X            "\nUsage: %s [-hqs] [-c<n>[cim]] [-l<n>] [-i<n>] [-sp <offset> <thickness>] [-tt <n>] [-th <n>] [-tl <n>] [-o outfile] [files]\n",
X            argv[0]);
X        fputs("   -h : Print this message\n", stderr);
X        fputs("   -q : Skip the copyright message at startup\n", stderr);
X        fputs("   -s : Use straight-line segments for x > s_limit\n",
X          stderr);
X        fputs("These take arguments:\n", stderr);
X        fputs("   -c : Set chord size. A trailing unit can be ", stderr);
X        fputs("specified:\n        c = cm, i = inches, m = mm (default)\n",
X          stderr);
X        fputs("   -l : Set s_limit to n (default is 0.025)\n", stderr);
X        fputs("   -i : Draw sheeting allowance of n units (units same as chord)\n", stderr);
X        fputs("   -sp: Draw a spar at offset of specified thickness\n",
X          stderr);
X        fputs("   -t.: Draw template outlines of specified size\n",
X          stderr);
X        fputs("   -o : Write output to file\n", stderr);
X        fputs("\nA good place to start is:\n", stderr);
X        fprintf(stderr, " %s -c 200m file1\n\n", argv[0]);
X        exit(1);
X     }
X      }
X      else
X     break;
X      argp++;
X   }
X
X done_opts:
X
X   if(!qflag) {
X      fputs("Plotfoil v2.1, Copyright 1992 Shamim Mohamed. This is", stderr);
X      fputs(" free software\nand is freely distributable under", stderr);
X      fputs(" certain conditions. See\nthe file \"COPYING\" in the", stderr);
X      fputs(" source area for details.\n", stderr);
X   }
X
X
X   if(*chord.units == '\0') {
X      chord.units = "mm";
X      chord.scale = 2.834;
X   }
X   do_scaling(&chord, 0);
X   do_scaling(&sheeting, &chord);
X   do_scaling(&templ_h, &chord);
X   do_scaling(&templ_te, &chord);
X   do_scaling(&templ_le, &chord);
X   for(i = 0; i < nspars; i++)
X      do_scaling(&spars[i].thick, &chord);
X
X   nsheets = (chord.pts+templ_te.pts+templ_le.pts)/720 + 1;
X
X   if(argp >= argc)
X      process(stdin, "<stdin>");
X   else
X      for (; argp < argc; argp++) {
X         if((fp = fopen(argv[argp], "r")) == NULL) {
X            fprintf(stderr, "%s: can't open \"%s\"\n", argv[0], argv[argp]);
X            continue;
X         }
X         process(fp, argv[argp]);
X         close(fp);
X      }
X
X   exit(0);
X}
X
void get_value(s, val)
char *s;
value *val;
X{
X   char c;
X
X   if(sscanf(s, "%f%c", &val->raw_value, &c) == 1) {
X      val->scale = 1.0;
X      val->units = "";
X   }
X   else
X      switch((int)c) {
X      case 'i': val->scale = 72.0; val->units = "\""; break;
X      case 'c': val->scale = 28.34; val->units = "cm"; break;
X      case 'm':
X      default:
X     val->units = "mm";
X     val->scale = 2.834; break;
X      }
X   val->pts = val->raw_value * val->scale;
X}
void do_scaling(val, master)
value *val, *master;
X{
X   if(val->units[0] == '\0' && master) {
X      val->units = master->units;
X      val->scale = master->scale;
X   }
X   val->pts = val->raw_value * val->scale;
X}
X
float U[MAXPOINTS], L[MAXPOINTS], X[MAXPOINTS], Y[MAXPOINTS];
char title[100];
X
void process(fp, f)
XFILE *fp;
char *f;
X{
X   float x, upper, lower, minx, maxx;
X   int i, n, bar;
X   char temp_buf[BUFSIZ];
X
X   init_output();
X   /* fmt_type = fgetc(fp); (void) fgetc(fp); */
X   fgets(title, 100, fp);
X   put_title(title);
X   (void) fgets(temp_buf, BUFSIZ, fp);
X   n = sscanf(temp_buf, "%f %f %f", &x, &upper, &lower);
X   if(n == 2) {
X      /* It's a straight x-y file, starting at the T.E. */
X      minx = maxx = X[0] = x; Y[0] = upper;
X      i = 1;
X
X      while((n = fscanf(fp, "%f %f", &x, &upper)) != EOF && n == 2) {
X         X[i] = x; Y[i] = upper;
X     if(minx > x) minx = x; if(maxx < x) maxx = x;
X         i++;
X      }
X      if(n != EOF && n != 2) {
X     fprintf(stderr, "Invalid input in \"%s\" (line %d)\n", f, i+2);
X     return;
X      }
X      if(X[0] != X[i-1] || Y[0] != Y[i-1]) {
X     fprintf(stderr,
X        "Invalid input: data does not start and end at the same point.\n");
X     return;
X      }
X      if(minx < 0.0) {
X     fprintf(stderr, "Error: x values cannot be negative.\n");
X     return;
X      }
X      if(maxx == 0.0) {
X     fprintf(stderr, "Error: no x values?\n");
X     return;
X      }
X      plot_points(-i, maxx);
X   }
X   else if(n == 3) {
X      minx = maxx = X[0] = x; U[0] = upper; L[0] = lower;
X      i = 1;
X
X      while((n = fscanf(fp, "%f %f %f", &x, &upper, &lower)) != EOF && n == 3){
X         X[i] = x; U[i] = upper; L[i] = lower;
X     if(minx > x) minx = x; if(maxx < x) maxx = x;
X         i++;
X      }
X      if(n != EOF && n != 3) {
X     fprintf(stderr, "Invalid input in \"%s\" (line %d)\n", f, i+2);
X     return;
X      }
X      if(minx < 0.0) {
X     fprintf(stderr, "Error: x values cannot be negative.\n");
X     return;
X      }
X      if(maxx == 0.0) {
X     fprintf(stderr, "Error: no x values?\n");
X     return;
X      }
X
X      plot_points(i, maxx);
X   }
X   else
X      fprintf(stderr, "Invalid input in \"%s\" (line 2)\n", f);
X}
X
static float upperx, uppery, lowerx, lowery;
X
X/* Misc. math. */
double sqr(x)
double x;
X{
X   return x*x;
X}
X
X/*
X * The Bezier part:
X */
X
X#define px(i) (points[(i)].x)
X#define py(i) (points[(i)].y)
X
point points[MAXPOINTS];
X
plot_points(n, maxx)
int n;
float maxx;
X{
X
X   int i, j, npoints = 0;
X   double m1, m2, m, l, p2x, p2y, p3x, p3y;
X   double d = 3.0, e = 0.2;
X   void init_lines(), put_curve();
X
X   /* first, collect all the points into one array points: */
X   if(n < 0) {
X      n = -n;
X      for(i = n - 1; i >= 0; i--, npoints++) {
X         px(npoints) = X[i]/maxx;
X         py(npoints) = Y[i]/maxx;
X      }
X   }
X   else {
X      for(i = n - 1; i >= 0; i--, npoints++) {
X         px(npoints) = X[i]/maxx;
X         py(npoints) = L[i]/maxx;
X      }
X      for(i = 1; i < n; i++, npoints++) {
X         px(npoints) = X[i]/maxx;
X         py(npoints) = U[i]/maxx;
X      }
X   }
X
X   if(tflag) {
X      draw_template(templ_h.pts, templ_le.pts, templ_te.pts);
X   }
X
X   for(i = 0; i < nspars; i++)
X      draw_spar(spars[i].offset, spars[i].thick.pts, points, npoints);
X
X   i = 0;
X   if(sflag) {
X      /* In the region s_limit to 100%, use straight lines to plot */
X      i = 1;
X      init_lines(px(0), py(0));
X      while(px(i) > s_limit && px(i) < 1.0) {
X         put_line(px(i), py(i));
X         i++;
X      }
X      i--;
X
X      for(j = i+1; px(j) <= s_limit && px(j) <= 1.0; j++)
X     ;
X
X      interpolate(points+i, j-i-1, d, e, init_lines, put_curve);
X
X      i = j;
X      /* Finish off rest i.e. 2.5% to 100% with straight lines */
X      for(;;) {
X     put_line(px(i), py(i));
X     if(px(i++) >= 1.0) break;
X      }
X   }
X   else
X      interpolate(points, npoints, d, e, init_lines, put_curve);
X
X   end_output();
X}
X
void draw_spar(offset, thick, points, n)
float offset, thick;
point *points;
int n;
X{
X   float upper, lower;
X   int i;
X
X   i = 0;
X   while(i < n) {
X      if(offset >= points[i].x) {
X     upper = points[i].y +
X        (points[i].y - points[i-1].y)/(points[i].x - points[i-1].x)*
X           (points[i].x - offset);
X     break;
X      }
X      i++;
X   }
X   while(i < n) {
X      if(offset <= points[i].x) {
X     lower = points[i].y +
X        (points[i].y - points[i-1].y)/(points[i].x - points[i-1].x)*
X           (points[i].x - offset);
X     break;
X      }
X      i++;
X   }
X
X   draw_double_line(offset, upper, offset, lower, thick);
X
X}
X
X/* ========================= PostScript routines =========================== */
X
void init_output()
X{
X   fputs("%!\n% Created by Plotfoil 2.0\n", fout);
X   fprintf(fout, "%%%%Orientation: Landscape\n");
X   fputs("/S {stroke} bind def /L {lineto} bind def /M {moveto} bind def\n",
X     fout);
X   fputs("/X {moveto 10 0 rmoveto -20 0 rlineto 10 0 rmoveto\n", fout);
X   fputs("    0 10 rmoveto 0 -20 rlineto 0 10 rmoveto} bind def\n", fout);
X   fputs("/drawbbox {4 dict begin\n", fout);
X   fputs("   /y2 exch def /x2 exch def /y1 exch def /x1 exch def\n", fout);
X   fputs("   x1 y1 X x1 y2 X x2 y2 X x2 y1 X\n", fout);
X   fputs("end} bind def\n", fout);
X   fputs("/drawrect {4 dict begin newpath\n", fout);
X   fputs("   /y2 exch def /x2 exch def /y1 exch def /x1 exch def\n", fout);
X   fputs("   x1 y1 moveto x1 y2 lineto x2 y2 lineto x2 y1 lineto closepath\n",
X     fout);
X   fputs("   stroke\nend} bind def\n", fout);
X   fputs("/landscape {newpath clippath pathbbox pop exch pop add 0 translate\n",
X     fout);
X   fputs("90 rotate newpath} bind def\n", fout);
X
X   fputs("/C {curveto} bind def\n", fout);
X   if(nsheets > 1) {
X      fputs("/plarge { /ii exch def /jj exch def /bproc exch def 0 1 ii\n",
X        fout);
X      fputs("1 sub { /i exch def 0 1 jj 1 sub { /j exch def newpath lm\n",
X        fout);
X      fputs("bm moveto 0 pht rlineto pwt 0 rlineto 0 pht neg rlineto\n", fout);
X      fputs("closepath gsave 0 setlinewidth stroke grestore clip gsave\n",
X        fout);
X      fputs("pwt j mul neg pht i mul neg translate bproc showpage\n", fout);
X      fputs("grestore } for } for } def newpath clippath pathbbox\n", fout);
X      fputs("1 sub /top exch def 1 sub /right exch def 1 add /bm exch def\n",
X        fout);
X      fputs("1 add /lm exch def /pwt right lm sub def /pht top bm sub def\n",
X        fout);
X      fputs("newpath\n", fout);
X   }
X}
X
void put_curve(x1, y1, x2, y2, x3, y3)
double x1, y1, x2, y2, x3, y3;
X{
X   x1 *= chord.pts; y1 *= chord.pts; x2 *= chord.pts; y2 *= chord.pts;
X   x3 *= chord.pts; y3 *= chord.pts;
X   fprintf(fout, "%.2f %.2f %.2f %.2f %.2f %.2f C\n", x1, y1, x2, y2, x3, y3);
X}
X
void init_lines(x, y)
double x, y;
X{
X   x *= chord.pts;
X   y *= chord.pts;
X#ifdef SAVEMEM
X   if(nsheets > 1)
X      fprintf(fout, "newpath } def /buildpath { %.2f %.2f M\n", x, y);
X   else
X      fprintf(fout, "newpath %.2f %.2f M\n", x, y);
X#else
X   fprintf(fout, "newpath %.2f %.2f M\n", x, y);
X#endif
X}
X
void put_line(x, y)
double x, y;
X{
X   fprintf(fout, "%.2f %.2f L\n", x*chord.pts, y*chord.pts);
X}
X
void end_lines()
X{
X   fputs("stroke\n", fout);
X}
X
void draw_double_line(x1, y1, x2, y2, spacing)
float x1, y1, x2, y2, spacing;
X{
X   fprintf(fout, "%.2f %.2f M %.2f %.2f L\n",
X       x1*chord.pts, y1*chord.pts, x2*chord.pts, y2*chord.pts);
X   if(spacing >= 1.0) {
X      fprintf(fout,
X          "gsave gsave %.1f setlinewidth 0 setgray stroke\n", spacing);
X      fprintf(fout,
X          "grestore %.1f setlinewidth 1 setgray stroke grestore newpath\n",
X          spacing-0.5);
X   }
X   else
X      fputs("stroke\n", fout);
X}
X
void draw_template(h, le, te)
float h, te, le;
X{
X   fprintf(fout, "-%.2f -%.2f %.2f %.2f drawrect\n", le, h, te+chord.pts, h);
X}
X
char *ftoa(x)
float x;
X{
X   static char buf[25];
X   char *p;
X   sprintf(buf, "%f", x);
X
X   p = buf; while(*p) p++;
X   p--;
X   while(*p == '0') p--;
X   if(*p == '.') p--;
X   p[1] = 0;
X   return buf;
X}
X
void put_title(s)
char *s;
X{
X   char *p;
X   int i;
X   float y;
X
X   p = s;
X   while(*p != '\n' && *p != '\0') p++;
X   *p = '\0';
X
X   fputs("gsave landscape\n", fout);
X   fprintf(fout,
X       "/Times-Roman findfont 30 scalefont setfont 50 130 M (%s) show\n",
X      s);
X   fputs("/Times-Roman findfont 11 scalefont setfont\n", fout);
X   y = 110.0;
X   fprintf(fout, "50 %.4g M (Chord: %.3g%s) show\n",y, chord.raw_value, chord.units);
X   y -= 13.4;
X   if(iflag) {
X      fprintf(fout, "50 %.4g M (with %.3g%s sheeting allowance) show\n", y,
X             sheeting.raw_value, sheeting.units);
X      y -= 13.4;
X   }
X
X   if(tflag) {
X      fprintf(fout, "50 %.4g M (template: height %.3g%s", y,
X         templ_h.raw_value, templ_h.units);
X      fprintf(fout, ", %.3g%s at LE,", templ_le.raw_value, templ_le.units);
X      fprintf(fout, " %.3g%s at TE) show\n", templ_te.raw_value,
X          templ_te.units);
X      y -= 13.4;
X   }
X   for(i = 0; i < nspars; i++, y -= 13.4)
X      fprintf(fout,
X          "50 %.4g M (Spar at %.3g %% chord, thickness %.3g%s) show\n",
X          y, spars[i].offset*100, spars[i].thick.raw_value,
X          spars[i].thick.units);
X   fputs("grestore newpath\n", fout);
X#ifdef SAVEMEM
X   if(nsheets > 1)
X      fputs("/setup {\n", fout);
X#else
X   if(nsheets > 1) putc('{', fout);
X#endif
X   fprintf(fout,
X       "0.1 setlinewidth landscape %.4g 300 translate\n", templ_le.pts+30);
X}
X
void end_output()
X{
X#ifdef SAVEMEM
X   if(nsheets > 1) fputs("} def /trail {", fout);
X#endif
X   if(iflag) {
X      fputs("gsave gsave gsave\n", fout);
X      fprintf(fout, "0 setgray %.4g setlinewidth stroke\n", sheeting.pts*2);
X      fprintf(fout, "grestore %.4g setlinewidth 1 setgray\n",
X          sheeting.pts*2-0.5);
X      fputs("stroke grestore [2 4] 0 setdash stroke grestore\n", fout);
X   }
X   else
X      fputs("gsave stroke grestore\n", fout);
X
X   fputs("pathbbox newpath drawbbox stroke\n", fout);
X   fprintf(fout,
X       "gsave .8 setgray %.4g 0 moveto %.4g 0 lineto stroke grestore\n",
X       -templ_le.pts, chord.pts+templ_te.pts);
X#ifdef SAVEMEM
X   if(nsheets > 1) fputs("} def {setup buildpath trail\n", fout);
X#endif
X   if(nsheets > 1)
X      fprintf(fout, "} 1 %d plarge\n", nsheets);
X   else
X      fputs("showpage\n", fout);
X}
X
END_OF_FILE
if test 17198 -ne `wc -c <'plotfoil/plotfoil.c'`; then
    echo shar: \"'plotfoil/plotfoil.c'\" unpacked with wrong size!
fi
# end of 'plotfoil/plotfoil.c'
fi
if test -f 'plotfoil/spline.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'plotfoil/spline.c'\"
else
echo shar: Extracting \"'plotfoil/spline.c'\" \(4617 characters\)
sed "s/^X//" >'plotfoil/spline.c' <<'END_OF_FILE'
X
X/*
X * Code to generate bezier control points to interpolate between points.
X * Copyright Shamim Mohamed 1991
X *
X * This program is free software; you can redistribute it and/or modify
X * it under the terms of the GNU General Public License as published by
X * the Free Software Foundation; either version 2 of the License, or
X * (at your option) any later version.
X *
X * This program is distributed in the hope that it will be useful,
X * but WITHOUT ANY WARRANTY; without even the implied warranty of
X * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
X * GNU General Public License for more details.
X *
X * You should have received a copy of the GNU General Public License
X * along with this program; if not, write to the Free Software
X * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
X *
X * [e-mail]
X * Shamim Mohamed
X * Dept of Computer Science
X * University of Arizona
X * Tucson, AZ 85721
X *
X * --------------------------------------------------------------------------
X *
X * Inputs: an array of points, the number of points, two fudge-factors,
X * and two procedures that are called for moveto and curveto. I use d = 3.0
X * and e = 0.2. d controls the slope of the curve depending on the neighbours
X * (it's not prob. worth futzing with it) and e controls the shape of the ends
X * of the curve. Experimenting with e may be fruitful.
X * This is NOT an approximation algorithm. Given n points, it ALWAYS generates
X * n-1 splines that pass through all the given points. For some sort of
X * optimum approximation, see the paper in "Graphics Gems", Klossner ed. (It's
X * the last source-code in the Appendix.)
X *
X * The callback procedures can be something like:
X * void moveto(x, y)
X * double x, y;
X * {
X *    printf("%g %g moveto\n", x, y);
X * }
X * void curveto(x1, y1, x2, y2, x3, y3)
X * double x, y;
X * {
X *    printf("%g %g %g %g %g curveto\n", x1, y1, x2, y2, x3, y3);
X * }
X *
X */
X
X
X#include <stdio.h>
X#include <math.h>
X
X#define MAXPOINTS 100
X#define sqr(a) ((a)*(a))
X
typedef struct {
X   double x, y;
X} point;
X
point cp[MAXPOINTS], cpp[MAXPOINTS];
double l[MAXPOINTS];
X
void interpolate(p, npoints, d, e, moveto, curveto)
point *p;
int npoints;
double d, e;
void (*moveto)(), (*curveto)();
X{
X   int i;
X   point slope_prev, slope_next;
X
X   l[1] = sqrt(sqr(p[0].x-p[1].x)+sqr(p[0].y-p[1].y));
X   slope_prev.x = p[1].x - p[0].x;
X   slope_prev.y = p[1].y - p[0].y;
X   for(i = 1; i < npoints-1; i++) {
X      point slope;
X      double m;
X
X      l[i+1] = sqrt(sqr(p[i].x-p[i+1].x)+sqr(p[i].y-p[i+1].y));
X
X      slope_next.x = p[i+1].x - p[i].x;
X      slope_next.y = p[i+1].y - p[i].y;
X
X      /*
X       * Slope of the curve at this point is the weighted ave. of
X       * straight-line slopes to neighbours (weighted by length of chord)
X       */
X
X      slope.x = slope_prev.x * l[i+1] + slope_next.x * l[i];
X      slope.y = slope_prev.y * l[i+1] + slope_next.y * l[i];
X
X      slope_prev = slope_next;
X
X      /*
X       * Alternative method:
X       * Parameters:
X       *  a 0     Higher number makes curve tighter. -1<a<1.
X       *  b .1    Higher number makes sharp curves tighter
X       *          and broad curves less tight. -1<b<1
X       *
X       * Given points A B and C, bezier control points for B are aligned along
X       * a line that is perpendicular to the line the bisects the angle ABC.
X       * The distance of the control points from B is determined by the
X       * following formula that was found by trial and error is has no
X       * particular theory behind it:
X       * Distance of control point from B towards A =
X       *    (1/2)*(distance between A and B)*
X       *       (cos(ABC)^(a*b + a + b))(b + 2(1-b)(1-a)/(3-a))
X       * (Timothy van Zandt <[e-mail]>)
X       * My opinion: one has to take an inverse cosine and raise it to a
X       * fractional power, and the results are very close to my simpler
X       * algorithm, so I don't think it's worth it.
X       */
X
X      /* Now we have slope: m is for the normalisation. */
X      m = sqrt(sqr(slope.x)+sqr(slope.y));
X      cp[i].x = p[i].x - l[i]*slope.x/(d*m);
X      cp[i].y = p[i].y - l[i]*slope.y/(d*m);
X      cpp[i].x = p[i].x + l[i+1]*slope.x/(d*m);
X      cpp[i].y = p[i].y + l[i+1]*slope.y/(d*m);
X   }
X   cpp[0].x = (e*cp[1].x + p[0].x)/(1+e);
X   cpp[0].y = (e*cp[1].y + p[0].y)/(1+e);
X   cp[npoints-1].x = (e*cpp[npoints-2].x + p[npoints-1].x)/(1+e);
X   cp[npoints-1].y = (e*cpp[npoints-2].y + p[npoints-1].y)/(1+e);
X
X   (*moveto)(p[0].x, p[0].y);
X   for(i = 1; i < npoints; i++)
X      (*curveto)(cpp[i-1].x, cpp[i-1].y, cp[i].x, cp[i].y, p[i].x, p[i].y);
X}
X
END_OF_FILE
if test 4617 -ne `wc -c <'plotfoil/spline.c'`; then
    echo shar: \"'plotfoil/spline.c'\" unpacked with wrong size!
fi
# end of 'plotfoil/spline.c'
fi
echo shar: End of archive 1 \(of 3\).
cp /dev/null ark1isdone
MISSING=""
for I in 1 2 3 ; do
    if test ! -f ark${I}isdone ; then
    MISSING="${MISSING} ${I}"
    fi
done
if test "${MISSING}" = "" ; then
    echo You have unpacked all 3 archives.
    rm -f ark[1-9]isdone
else
    echo You still need to unpack the following archives:
    echo "        " ${MISSING}
fi
##  End of shell archive.
exit 0

exit 0 # Just in case...