v10i098: hpgl -- HPGL for X11, Part02/02
Andrew Gerber
gerber at sushi.Solbourne.COM
Wed Dec 19 13:43:16 AEST 1990
Submitted-by: gerber at sushi.Solbourne.COM (Andrew Gerber)
Posting-number: Volume 10, Issue 98
Archive-name: xhpgl/part02
---- Cut Here and unpack ----
#!/bin/sh
# shar: Shell Archiver (v1.22)
#
# Run the following text with /bin/sh to create:
# parse.c
# pc.xw
# shuttle.uuencoded
# xhpgl.1
#
if test -f parse.c; then echo "File parse.c exists"; else
echo "x - extracting parse.c (Text)"
sed 's/^X//' << 'SHAR_EOF' > parse.c &&
X/*
X * parse.c -- This is a hand-coded HPGL parser, to see if I can get
X * somewhat better performance than the YACC parser gives
X * me.
X *
X * Author : Dieter Muller
X * Ported to X11 & Line Type fixes: Andy Gerber
X * Created : Wed Oct 31 21:13:38 1990
X */
X
X/* Header Files */
X
X#include <stdio.h>
X#include <math.h>
X#include <varargs.h>
X#include <sys/param.h>
X#include <X11/X.h>
X#include <X11/Xlib.h>
X#include <math.h>
X# include "y.tab.h" /* as generated by the original grammar */
X
X/* X windows variables. */
Xextern XColor pen[];
Xextern Window main_window;
Xextern Font text_font;
Xextern XFontStruct *font_info;
Xextern short font_offset;
Xextern GC gc;
Xextern Display *dpy;
Xextern int span_count;
Xextern initialize_plotter();
Xextern int dont_scale; /* should we scale coordinates? Not done if zooming */
Xextern int minWidth,minHeight; /* size of X window for plotting */
X/* Macro Definitions */
X
X/* Variable Definitions */
X
XYYSTYPE yylval;
Xdouble xScale = 1.0;
Xdouble yScale = 1.0;
Xstatic int pushed_token = -1;
X
X/* Function Declarations */
X
Xvoid unget_token ();
Xint next_token ();
Xvoid eat_to_semi ();
Xvoid ignored ();
Xvoid error ();
Xint yywrap ();
Xvoid draw_line ();
Xvoid draw_rectangle();
Xvoid draw_text ();
Xvoid scale_coord ();
Xint get_coord_pair ();
Xvoid coord_list ();
Xvoid yyparse ();
Xvoid line_type_change();
X
X/* pattern definitions for drawing dashed lines */
X/* default |________| */
X/* line 0 | | */
X/* line 1 |_ | */
X/* line 2 |____ | */
X/* line 3 |______ | */
X/* line 4 |______ _| */
X/* line 5 |_____ __| */
X/* line 6 |____ _ _| */
X
Xstatic unsigned char line_types[][6] = {
X {1, 15},
X {1, 15},
X {8, 8},
X {12, 4},
X {13, 1, 1, 1},
X {12, 1, 2, 1},
X {9, 1, 2, 1, 2, 1}
X};
X
Xstatic int line_type_elements[] = {2, 2, 2, 2, 4, 4, 6};
X
X
X/**********************************************************************
X * yyparse () --- Read HPGL statements, drawing the results as we
X * go.
X */
X
Xvoid yyparse ()
X{
X extern FILE * yyin;
X extern YYSTYPE yylval;
X extern char yytext [];
X extern int absolute;
X extern int pen_down;
X extern int is_color;
X extern int cur_pen;
X extern int rectangle;
X
X int token;
X
X while ((token = next_token ()) > 0)
X {
X/* getc(stdin);
X printf("%s", yytext);
X*/
X switch (token)
X {
X case LT:
X line_type_change();
X break;
X case LB:
X draw_text (yylval.sb);
X break;
X case PA:
X absolute = 1;
X coord_list ();
X break;
X case PR:
X absolute = 0;
X coord_list ();
X break;
X case PU:
X pen_down = 0;
X coord_list ();
X break;
X case PD:
X pen_down = 1;
X coord_list ();
X break;
X case EA:
X /* draw a rectangle */
X rectangle = 1;
X coord_list();
X rectangle = 0;
X break;
X case RA:
X /* This is a filled rectangle, not supported */
X rectangle = 1;
X coord_list();
X rectangle = 0;
X break;
X case SP:
X if (is_color)
X {
X cur_pen = pen[yylval.i].pixel;
X XSetForeground(dpy, gc, cur_pen);
X }
X break;
X case SC:
X scale_coord ();
X break;
X case RESET:
X initialize_plotter ();
X break;
X case SEMICOLON:
X break;
X case EAT_TO_SEMI:
X eat_to_semi();
X break;
X default:
X error ("Unexpected token %d, symbol `%s'\n", token, yytext);
X /*NOTREACHED*/
X }
X }
X
X return;
X} /* end of yyparse () */
X
X/**********************************************************************
X * line_type_change() --- change line type
X *
X *
X * Handle getting a LT changes, sees if line type was specified
X */
X
Xvoid line_type_change()
X{
X int token;
X int new_lt;
X int result;
X XGCValues gc_vals;
X new_lt = -1;
X result = 0;
X token = next_token ();
X if (token == DIGIT)
X {
X new_lt = yylval.i;
X token = next_token (token);
X
X if (token != SEMICOLON)
X {
X error ("Unexpected token %d, symbol `%s'\n", token, yytext);
X eat_to_semi();
X }
X result = 1;
X }
X else if (token == SEMICOLON)
X {
X new_lt = -99;
X result = 1;
X }
X
X if (new_lt == -99)
X {
X gc_vals.line_style = LineSolid;
X XChangeGC(dpy, gc, GCLineStyle, &gc_vals);
X }
X else if (new_lt >= 0 && new_lt <= 6)
X {
X gc_vals.line_style = LineOnOffDash;
X XChangeGC(dpy, gc, GCLineStyle, &gc_vals);
X XSetDashes(dpy, gc, 0, line_types[new_lt], line_type_elements[new_lt]);
X }
X
X if (!result)
X {
X unget_token (token);
X eat_to_semi ();
X }
X
X}
X
X/**********************************************************************
X * coord_list () --- Handle parsing an optional list of
X * coordinates.
X *
X * A list of coordinates looks like INT, INT [, INT, INT]. Basically,
X * coordinate pairs separated by commas.
X */
X
Xvoid coord_list ()
X{
X int token;
X
X while (get_coord_pair ())
X {
X token = next_token ();
X if (token != COMMA)
X {
X unget_token (token);
X break;
X }
X }
X
X return;
X} /* end of coord_list () */
X
X/**********************************************************************
X * get_coord_pair () --- Reads a pair of coordinates of the form
X * INTEGER COMMA INTEGER
X *
X * Returns:
X *
X * SUCCESS --- True, if we got a valid pair
X * FAILURE --- False, if something's wrong. We also eat
X * through to the next semi-colon, if any.
X */
X
Xint get_coord_pair ()
X{
X extern int last_x;
X extern int last_y;
X extern int x;
X extern int y;
X extern YYSTYPE yylval;
X extern int absolute;
X extern int pen_down;
X extern double xMin;
X extern double xMax;
X extern double yMin;
X extern double yMax;
X extern double xScale;
X extern double yScale;
X extern int minWidth;
X extern int minHeight;
X extern int rectangle;
X
X int token;
X int result;
X double scratch_x;
X double scratch_y;
X
X result = 0;
X token = next_token ();
X if (token == DIGIT || token == NUMBER)
X {
X if (token == DIGIT) scratch_x = yylval.i;
X else scratch_x = yylval.f;
X
X token = next_token (token);
X if (token == COMMA)
X {
X token = next_token ();
X if (token == DIGIT || token == NUMBER)
X {
X if (token == DIGIT) scratch_y = yylval.i;
X else scratch_y = yylval.f;
X
X last_x = x;
X last_y = y;
X
X if (absolute)
X {
X x = (scratch_x - xMin) * xScale;
X y = (scratch_y - yMin) * yScale;
X }
X else
X {
X x = x + (scratch_x - xMin) * xScale;
X y = minHeight - y + (scratch_y - yMin) * yScale;
X }
X
X y = minHeight - y;
X
X if (pen_down && !rectangle)
X draw_line ();
X else if (rectangle)
X draw_rectangle();
X
X result = 1;
X }
X }
X }
X
X if (!result)
X {
X unget_token (token);
X eat_to_semi ();
X }
X
X return (result);
X} /* end of get_coord_pair () */
X
X/**********************************************************************
X * scale_coord () --- set up new user coordinate boundaries
X *
X * We need two pairs of comma-separated coordinates, a total of four
X * INTEGERs and three COMMAs.
X */
X
Xvoid scale_coord ()
X{
X extern double xMin;
X extern double xMax;
X extern double yMin;
X extern double yMax;
X extern double xScale;
X extern double yScale;
X extern int minWidth;
X extern int minHeight;
X
X double scratch [4];
X int count;
X int token;
X int done;
X int result;
X
X result = 0;
X done = 0;
X count = 0;
X while (!done)
X {
X token = next_token ();
X if (token == DIGIT || token == NUMBER)
X {
X if (token == DIGIT) scratch [count++] = yylval.i;
X else scratch [count++] = yylval.f;
X
X if (count < 4)
X {
X token = next_token ();
X if (token != COMMA) /* die with !result */
X done = 1;
X }
X else
X {
X if (!dont_scale)
X {
X xMin = scratch [0];
X xMax = scratch [1];
X yMin = scratch [2];
X yMax = scratch [3];
X
X xScale = minWidth / (xMax - xMin);
X yScale = minHeight / (yMax - yMin);
X
X /* Make sure x is in proportion to y */
X
X if (yScale < xScale)
X {
X xMax = xMin + minWidth/yScale;
X xScale = minWidth / (xMax - xMin);
X yScale = minHeight / (yMax - yMin);
X }
X else
X {
X yMax = yMin + minHeight/xScale;
X xScale = minWidth / (xMax - xMin);
X yScale = minHeight / (yMax - yMin);
X }
X }
X
X result = 1;
X done = 1;
X }
X }
X }
X
X if (!result)
X {
X unget_token (token);
X eat_to_semi ();
X }
X
X return;
X} /* end of scale_coord () */
X
X/**********************************************************************
X * draw_text () --- Display some text at the current point
X *
X * Arguments:
X *
X * text -i- What to draw.
X */
X
Xvoid draw_text (txt)
Xchar * txt;
X{
X extern int x;
X extern int y;
X XTextItem text;
X
X text.nchars = strlen(txt);
X text.delta = 0;
X text.font = text_font;
X text.chars = txt;
X
X XDrawText(dpy, main_window, gc, x,y-font_offset, &text, 1);
X x += XTextWidth(font_info, txt, text.nchars);
X return;
X} /* end of draw_text () */
X
X/**********************************************************************
X * draw_line () --- Draw a vector between the last coordinate pair
X * and the current one
X */
X
Xvoid draw_line ()
X{
X extern int last_x;
X extern int last_y;
X extern int x;
X extern int y;
X
X/* printf("Draw line %d %d %d %d\n", last_x, last_y, x, y); */
X XDrawLine(dpy, main_window, gc, last_x, last_y, x, y);
X ++span_count;
X return;
X} /* end of draw_line () */
X
X/**********************************************************************
X * draw_line () --- Draw a rectangle between the last coordinate pair
X * and the current one
X */
X
Xvoid draw_rectangle()
X{
X extern int last_x;
X extern int last_y;
X extern int x;
X extern int y;
X
X XDrawLine(dpy, main_window, gc, last_x, last_y, last_x, y);
X XDrawLine(dpy, main_window, gc, last_x, last_y, x, last_y);
X XDrawLine(dpy, main_window, gc, last_x, y, x, y);
X XDrawLine(dpy, main_window, gc, x, last_y, x, y);
X
X span_count = span_count + 4;
X return;
X} /* end of draw_line () */
X
X/**********************************************************************
X * yywrap () --- Pacify yylex()
X *
X * Returns:
X *
X * SUCCESS --- Always true, to indicate EOF
X */
X
Xint yywrap ()
X{
X return (1);
X} /* end of yywrap () */
X
X/**********************************************************************
X * error () --- Handles reporting syntax errors in a reasonably
X * nice way.
X * Arguments:
X *
X * va_alist --- A printf-like set of arguments.
X */
X
Xvoid error (va_alist)
Xva_dcl
X{
X va_list args;
X char * fmt;
X char err_buf [MAXPATHLEN * 2];
X
X va_start (args);
X
X fmt = va_arg (args, char *);
X strcpy (err_buf, "\nSyntax error: ");
X (void) vsprintf (err_buf + strlen (err_buf), fmt, args);
X
X va_end (args);
X
X fflush (stdout);
X fputs (err_buf, stderr);
X
X return;
X} /* end of error () */
X
X/**********************************************************************
X * ignored () --- Handles reporting that we're ignoring something
X * nicely.
X *
X * Arguments:
X *
X * va_alist --- A printf-like set of arguments.
X */
X
Xvoid ignored (va_alist)
Xva_dcl
X{
X va_list args;
X char * fmt;
X char err_buf [MAXPATHLEN * 2];
X
X va_start (args);
X
X fmt = va_arg (args, char *);
X strcpy (err_buf, "\nUnsupported command ignored: ");
X (void) vsprintf (err_buf + strlen (err_buf), fmt, args);
X va_end (args);
X
X fflush (stdout);
X fputs (err_buf, stderr);
X
X return;
X} /* end of ignored () */
X
X/**********************************************************************
X * eat_to_semi () --- Throw away input until we hit EOF or a
X * semi-colon
X */
X
Xvoid eat_to_semi ()
X{
X int token;
X
X while (1)
X {
X token = next_token ();
X if ( token < 0
X || token == SEMICOLON)
X {
X break;
X }
X }
X
X return;
X} /* end of eat_to_semi () */
X
X/**********************************************************************
X * next_token () --- Returns the next token
X */
X
Xint next_token ()
X{
X extern pushed_token;
X
X int token;
X
X if (pushed_token != -1)
X {
X token = pushed_token;
X pushed_token = -1;
X }
X else
X {
X token = yylex ();
X }
X
X return (token);
X} /* end of next_token () */
X
X/**********************************************************************
X * unget_token () --- Push a token back for later examination
X *
X * Arguments:
X *
X * token -i- The token to push back.
X */
X
Xvoid unget_token (token)
Xint token;
X{
X extern int pushed_token;
X
X if (pushed_token != -1)
X {
X error ("Two pushes in a row");
X exit (1);
X }
X
X pushed_token = token;
X
X return;
X} /* end of unget_token () */
X
X
X
X
X
X
X
X
SHAR_EOF
chmod 0644 parse.c || echo "restore of parse.c fails"
set `wc -c parse.c`;Sum=$1
if test "$Sum" != "12859"
then echo original size 12859, current size $Sum;fi
fi
if test -f pc.xw; then echo "File pc.xw exists"; else
echo "x - extracting pc.xw (Text)"
sed 's/^X//' << 'SHAR_EOF' > pc.xw &&
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XPU;PA1740,506;PD;PA1740,544;
XPU;PA1760,506;PD;PA1760,544;
XPU;PA1780,506;PD;PA1780,544;
XPU;PA1800,506;PD;PA1800,544;
XPU;PA1820,506;PD;PA1820,544;
XPU;SP7;PU;PA1846,513;
XPU;LBSLICE 4
XPU;PA0,1389;
XPU;LBPC 11-JUL-89 12:06 Page 1
XPU;SP0;.).(PU;PA0,1439;DF;SP0;.)
SHAR_EOF
chmod 0644 pc.xw || echo "restore of pc.xw fails"
set `wc -c pc.xw`;Sum=$1
if test "$Sum" != "4280"
then echo original size 4280, current size $Sum;fi
fi
if test -f shuttle.uuencoded; then echo "File shuttle.uuencoded exists"; else
echo "x - extracting shuttle.uuencoded (Text)"
sed 's/^X//' << 'SHAR_EOF' > shuttle.uuencoded &&
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X,>$$00 81P4.@ "@
X
Xend
SHAR_EOF
chmod 0666 shuttle.uuencoded || echo "restore of shuttle.uuencoded fails"
set `wc -c shuttle.uuencoded`;Sum=$1
if test "$Sum" != "17714"
then echo original size 17714, current size $Sum;fi
fi
if test -f xhpgl.1; then echo "File xhpgl.1 exists"; else
echo "x - extracting xhpgl.1 (Text)"
sed 's/^X//' << 'SHAR_EOF' > xhpgl.1 &&
X.TH XHPGL 1 "Dec 1990" "Version 2.0"
X.SH NAME
Xxhpgl \- HPGL version 7470a Xwindow display program
X.SH SYNOPSIS
X.B xhpgl
X-cf [color_file] -fn [font] -geom [window geometry] file
X.SH DESCRIPTION
X.I xhpgl
Xis an Xwindow display program that will read a file in HPGL syntax and
Xdisplay it on a X server DISPLAY.
X.I xhpgl
Xis compatible with X11. The HPGL Syntax is restricted to that
Xdescribed in the 7470A manual. Most of the commands are supported,
Xbut some are not (see supported commands).
X
X.I Xhpgl
Xalso has some added features.
X.I Xhpgl
Xsupports up to 8 different pens where the 7470A routine only supports 2.
XThe color/pen assignments are user definable. All pen colors are read from
Xa file called $HOME/.hpcolors. The colors supported are: black, red, green,
Xblue, yellow, cyan, magenta, gold, maroon, turquoise, violet, orange and white.
XThe .hpcolors file is of the form "pen# color". Only pens 1 to 8 are used.
Xan error will occur if a pen number larger than 8 is given. If no color
Xfile is found the program will display a message and use internal values.
XThe -cf color_file option may be used to over-ride the default color file
Xon a case by case bases.
X
XThe text used in
X.I xhpgl
Xis of fixed size. That means that there is no scaling or slanting of text
Xallowed. To help make text more usable
X.I xhpgl
Xwill select a font based on the window size. Also, the -fn
Xoption may be used to specify any user font instead of the default selection.
X
X.I Xhpgl
Xhas simple commands built into it for controlling the display window. 'z' allows
Xthe user to zoom into a portion of the xhpgl display. 'u'
Xunzooms, effectivly quadrupling the area shown. 'o' returns to the
Xoriginal display, 'r' redraws the screen, and 'q' quits the program.
XAll other keys and mouse activity are ignored.
X.SH OPTIONS
X.I xhpgl
Xwill take any font supplied by the user. The -fn parameter is used for this
Xpurpose.
X.I xhpgl
Xwill take only one file in HPGL syntax at a time and display it.
XThe -cf color_file option is used to instruct
X.I xhpgl
Xto use a different color file other than $HOME/.hpcolors.
X
X.SH SUPPORTED COMMANDS
X.I xhpgl
Xwill recognize and execute the following HPGL commands:
XLT, LB, PA, PR, PU, PD, IN, DF, SP, and SC.
XAll others are read and accepted however no action will be taken.
X
X.SH AUTHOR
XOriginal xhpgl program: Randy L. Yach
X.br
XPort to X11: Andrew Gerber (gerber at solbourne.com)
X.br
XParser: Dieter Muller (dworkin at solbourne.com)
SHAR_EOF
chmod 0644 xhpgl.1 || echo "restore of xhpgl.1 fails"
set `wc -c xhpgl.1`;Sum=$1
if test "$Sum" != "2448"
then echo original size 2448, current size $Sum;fi
fi
exit 0
--
dan
----------------------------------------------------
O'Reilly && Associates argv at sun.com / argv at ora.com
Opinions expressed reflect those of the author only.
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