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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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|
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|
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#include <stdio.h> |
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|
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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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|
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|
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#define FHUGE 1e10 |
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|
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#define MAXSIZE 10000 /* Maximum size in characters of output */ |
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|
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extern char *progname; /* argv[0] */ |
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|
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static char outcarr[MAXSIZE]; /* character output array */ |
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|
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static double xmin = XMAX, xmax = XMIN, /* extrema */ |
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ymin = YMAX, ymax = YMIN; |
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|
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static int dwidth, dlength; /* device width and length */ |
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|
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static int nplottable; /* number of plottable points */ |
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|
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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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|
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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nplottable++; |
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} |
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|
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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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|
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for (op = outcarr+dlength*dwidth; op > outcarr; ) |
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*--op = ' '; |
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|
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for (i = 0; i < MAXCUR; i++) |
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mgcurve(i, cpoint); |
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|
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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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|
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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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|
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if (x < xmin || x > xmax || y < ymin || y > ymax) |
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return; |
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|
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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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|
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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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} |
