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#ifndef lint
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static const char RCSid[] = "$Id: cgraph.c,v 1.1 2003/02/22 02:07:26 greg Exp $";
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#endif
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/*
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* cgraph.c - routines for sending graphs to tty's.
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*
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* Greg Ward
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* 7/7/86
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*/
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#include <stdio.h>
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#include "rterror.h"
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#include "meta.h"
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#include "mgvars.h"
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#define FHUGE 1e10
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#define MAXSIZE 10000 /* Maximum size in characters of output */
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extern char *progname; /* argv[0] */
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static char outcarr[MAXSIZE]; /* character output array */
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static double xmin = XMAX, xmax = XMIN, /* extrema */
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ymin = YMAX, ymax = YMIN;
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static int dwidth, dlength; /* device width and length */
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static int nplottable; /* number of plottable points */
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static void climits(void);
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static void cstretch(int c, double x, double y);
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extern void
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cgraph( /* do a character graph to stdout */
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int width,
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int length
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)
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{
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if (width * length > MAXSIZE) {
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fprintf(stderr, "%s: page too big\n", progname);
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quit(1);
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}
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dwidth = width;
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dlength = length;
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climits(); /* get min & max values */
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cplot(); /* do character plot */
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}
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static void
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climits(void) /* get min & max values */
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{
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int i;
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xmin = gparam[XMIN].flags & DEFINED ?
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varvalue(gparam[XMIN].name) :
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FHUGE ;
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xmax = gparam[XMAX].flags & DEFINED ?
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varvalue(gparam[XMAX].name) :
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-FHUGE ;
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ymin = gparam[YMIN].flags & DEFINED ?
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varvalue(gparam[YMIN].name) :
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FHUGE ;
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ymax = gparam[YMAX].flags & DEFINED ?
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varvalue(gparam[YMAX].name) :
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-FHUGE ;
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nplottable = 0;
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for (i = 0; i < MAXCUR; i++)
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mgcurve(i, cstretch);
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if (nplottable == 0) {
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fprintf(stderr, "%s: no plottable data\n", progname);
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quit(1);
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}
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printf("XMIN= %f XMAX= %f YMIN= %f YMAX= %f\n",
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xmin, xmax, ymin, ymax);
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}
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void
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cstretch( /* stretch our boundaries */
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int c,
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double x,
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double y
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)
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{
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if (gparam[XMIN].flags & DEFINED &&
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x < xmin)
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return;
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if (gparam[XMAX].flags & DEFINED &&
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x > xmax)
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return;
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if (gparam[YMIN].flags & DEFINED &&
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y < ymin)
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return;
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if (gparam[YMAX].flags & DEFINED &&
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y > ymax)
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return;
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if (x < xmin)
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xmin = x;
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if (x > xmax)
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xmax = x;
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if (y < ymin)
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ymin = y;
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if (y > ymax)
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ymax = y;
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nplottable++;
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}
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extern void
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cplot(void) /* do character plot */
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{
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int i, j;
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register char *op;
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for (op = outcarr+dlength*dwidth; op > outcarr; )
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*--op = ' ';
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for (i = 0; i < MAXCUR; i++)
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mgcurve(i, cpoint);
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for (i = 0; i < dlength; i++) {
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for (j = 0; j < dwidth; j++)
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putchar(*op++);
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putchar('\n');
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}
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}
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extern void
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cpoint( /* store a point */
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int c,
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double x,
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double y
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)
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{
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register int ndx;
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if (x < xmin || x > xmax || y < ymin || y > ymax)
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return;
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ndx = (dlength-1)*(1.0 - (y - ymin)/(ymax - ymin)) + 0.5;
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ndx = dwidth*ndx + (dwidth-1)*(x-xmin)/(xmax-xmin) + 0.5;
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if (outcarr[ndx] == ' ')
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outcarr[ndx] = c+'A';
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else if (outcarr[ndx] > '1' && outcarr[ndx] < '9')
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outcarr[ndx]++;
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else if (outcarr[ndx] == '9')
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outcarr[ndx] = '*';
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else if (outcarr[ndx] != '*')
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outcarr[ndx] = '2';
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}
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