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#ifndef lint
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static const char RCSid[] = "$Id: mgraph.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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* mgraph.c - routines for plotting graphs from variables.
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*
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* 6/23/86
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*
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* Greg Ward Larson
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*/
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#include <stdio.h>
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#include <string.h>
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#include "meta.h"
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#include "mgvars.h"
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#include "mgraph.h"
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extern char *progname; /* argv[0] */
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extern double goodstep(), floor(), ceil(), sin(), cos();
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static BOUNDS xbounds, ybounds; /* the boundaries for the graph */
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static double period = DEFPERIOD; /* period for polar plot */
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static double axbegin, axsize; /* the mapped x axis boundaries */
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static double aybegin, aysize; /* the mapped y axis boundaries */
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static int npltbl[MAXCUR]; /* plottable points per curve */
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static double lastx, lasty; /* last curve postion */
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static int nplottable; /* number of plottable points */
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static int nplotted; /* number of plotted points */
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static void getbounds(void);
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static void polaraxis(void);
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static void makeaxis(void);
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static void plotcurves(void);
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static void cartaxis(void);
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static void stretchbounds(int c, double x, double y);
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static void boxstring(int xmin, int ymin, int xmax, int ymax,
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char *s, int d, int width, int color);
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static void drawcircle(int x, int y, int r, int typ, int wid, int col);
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static int rconv(double r);
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static int xconv(double x);
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static int yconv(double y);
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static void csymbol(int c, double u, double v);
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static int cmline(int c, int x, int y);
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static void cmsymbol(int c, int x, int y);
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static int inbounds(double x, double y);
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static void climline(int c, double x, double y, double xout, double yout);
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static void nextpoint(register int c, double x, double y);
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static void cline(int c, double u1, double v1, double u2, double v2);
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void
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mgraph(void) /* plot the current graph */
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{
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/* load the symbol file */
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if (gparam[SYMFILE].flags & DEFINED)
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minclude(gparam[SYMFILE].v.s);
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/* check for polar plot */
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if (gparam[PERIOD].flags & DEFINED)
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period = varvalue(gparam[PERIOD].name);
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getbounds(); /* get the boundaries */
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makeaxis(); /* draw the coordinate axis */
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plotcurves(); /* plot the curves */
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mendpage(); /* advance page */
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}
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void
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getbounds(void) /* compute the boundaries */
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{
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int i;
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xbounds.min = gparam[XMIN].flags & DEFINED ?
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varvalue(gparam[XMIN].name) - FTINY :
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FHUGE ;
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xbounds.max = gparam[XMAX].flags & DEFINED ?
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varvalue(gparam[XMAX].name) + FTINY :
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-FHUGE ;
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ybounds.min = gparam[YMIN].flags & DEFINED ?
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varvalue(gparam[YMIN].name) - FTINY :
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FHUGE ;
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ybounds.max = gparam[YMAX].flags & DEFINED ?
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varvalue(gparam[YMAX].name) + FTINY :
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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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npltbl[i] = 0;
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mgcurve(i, stretchbounds);
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nplottable += npltbl[i];
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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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xbounds.step = gparam[XSTEP].flags & DEFINED ?
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varvalue(gparam[XSTEP].name) :
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period > FTINY ?
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DEFPLSTEP*period :
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goodstep(xbounds.max - xbounds.min) ;
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if (!(gparam[XMIN].flags & DEFINED))
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xbounds.min = floor(xbounds.min/xbounds.step) *
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xbounds.step;
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if (!(gparam[XMAX].flags & DEFINED))
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xbounds.max = ceil(xbounds.max/xbounds.step) *
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xbounds.step;
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ybounds.step = gparam[YSTEP].flags & DEFINED ?
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varvalue(gparam[YSTEP].name) :
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period > FTINY ?
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goodstep((ybounds.max - ybounds.min)*1.75) :
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goodstep(ybounds.max - ybounds.min) ;
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if (!(gparam[YMIN].flags & DEFINED))
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ybounds.min = floor(ybounds.min/ybounds.step) *
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ybounds.step;
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if (!(gparam[YMAX].flags & DEFINED))
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ybounds.max = ceil(ybounds.max/ybounds.step) *
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ybounds.step;
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if (gparam[XMAP].flags & DEFINED) {
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axbegin = funvalue(gparam[XMAP].name, 1, &xbounds.min);
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axsize = funvalue(gparam[XMAP].name, 1, &xbounds.max);
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axsize -= axbegin;
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} else {
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axbegin = xbounds.min;
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axsize = xbounds.max;
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axsize -= axbegin;
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}
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if (gparam[YMAP].flags & DEFINED) {
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aybegin = funvalue(gparam[YMAP].name, 1, &ybounds.min);
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aysize = funvalue(gparam[YMAP].name, 1, &ybounds.max);
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aysize -= aybegin;
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} else {
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aybegin = ybounds.min;
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aysize = ybounds.max;
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aysize -= aybegin;
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}
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}
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void
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makeaxis(void) /* draw the coordinate axis */
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{
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char stmp[64];
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if (period > FTINY)
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polaraxis();
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else
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cartaxis();
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/* x axis label */
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if (gparam[XLABEL].flags & DEFINED)
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boxstring(XL_L,XL_D,XL_R,XL_U,gparam[XLABEL].v.s,'r',0,0);
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/* x mapping */
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if (gparam[XMAP].flags & DEFINED) {
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mgtoa(stmp, &gparam[XMAP]);
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boxstring(XM_L,XM_D,XM_R,XM_U,stmp,'r',0,0);
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}
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/* y axis label */
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if (gparam[YLABEL].flags & DEFINED)
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boxstring(YL_L,YL_D,YL_R,YL_U,gparam[YLABEL].v.s,'u',0,0);
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/* y mapping */
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if (gparam[YMAP].flags & DEFINED) {
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mgtoa(stmp, &gparam[YMAP]);
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boxstring(YM_L,YM_D,YM_R,YM_U,stmp,'u',0,0);
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}
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/* title */
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if (gparam[TITLE].flags & DEFINED)
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boxstring(TI_L,TI_D,TI_R,TI_U,gparam[TITLE].v.s,'r',2,0);
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/* subtitle */
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if (gparam[SUBTITLE].flags & DEFINED)
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boxstring(ST_L,ST_D,ST_R,ST_U,gparam[SUBTITLE].v.s,'r',1,0);
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/* legend */
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if (gparam[LEGEND].flags & DEFINED)
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mtext(LT_X, LT_Y, gparam[LEGEND].v.s, CPI, 0);
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}
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void
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polaraxis(void) /* print polar coordinate axis */
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{
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int lw, tstyle, t0, t1;
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double d, d1, ybeg;
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char stmp[64], *fmt, *goodformat();
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/* get tick style */
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if (gparam[TSTYLE].flags & DEFINED)
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tstyle = varvalue(gparam[TSTYLE].name) + 0.5;
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else
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tstyle = DEFTSTYLE;
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/* start of numbering */
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ybeg = ceil(ybounds.min/ybounds.step)*ybounds.step;
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/* theta (x) numbering */
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fmt = goodformat(xbounds.step);
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for (d = 0.0; d < period-FTINY; d += xbounds.step) {
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sprintf(stmp, fmt, d);
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d1 = d*(2*PI)/period;
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t0 = TN_X + TN_R*cos(d1) + .5;
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if (t0 < TN_X)
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t0 -= strlen(stmp)*CWID;
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mtext(t0,(int)(TN_Y+TN_R*sin(d1)+.5),stmp,CPI,0);
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}
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/* radius (y) numbering */
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fmt = goodformat(ybounds.step);
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lw = PL_R+RN_S;
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for (d = ybeg; d <= ybounds.max+FTINY; d += ybounds.step) {
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t0 = rconv(d);
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if (t0 >= lw+RN_S || t0 <= lw-RN_S) {
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sprintf(stmp, fmt, d);
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mtext(RN_X+t0-strlen(stmp)*(CWID/2),RN_Y,stmp,CPI,0);
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lw = t0;
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}
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}
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/* frame */
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if (gparam[FTHICK].flags & DEFINED)
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lw = varvalue(gparam[FTHICK].name) + 0.5;
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else
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lw = DEFFTHICK;
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if (lw-- > 0) {
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drawcircle(PL_X,PL_Y,PL_R,0,lw,0);
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switch (tstyle) {
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case 1: /* outside */
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t0 = 0; t1 = TLEN; break;
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case 2: /* inside */
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t0 = TLEN; t1 = 0; break;
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case 3: /* accross */
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t0 = TLEN/2; t1 = TLEN/2; break;
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default: /* none */
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t0 = t1 = 0; break;
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}
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if (t0 + t1) {
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for (d = 0.0; d < 2*PI-FTINY;
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d += xbounds.step*(2*PI)/period) {
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mline((int)(PL_X+(PL_R-t0)*cos(d)+.5),
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(int)(PL_Y+(PL_R-t0)*sin(d)+.5),
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0, lw, 0);
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mdraw((int)(PL_X+(PL_R+t1)*cos(d)+.5),
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(int)(PL_Y+(PL_R+t1)*sin(d)+.5));
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}
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}
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}
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/* origin */
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if (gparam[OTHICK].flags & DEFINED)
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lw = varvalue(gparam[OTHICK].name) + 0.5;
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else
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lw = DEFOTHICK;
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if (lw-- > 0) {
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mline(PL_X-PL_R,PL_Y,0,lw,0);
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mdraw(PL_X+PL_R,PL_Y);
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mline(PL_X,PL_Y-PL_R,0,lw,0);
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mdraw(PL_X,PL_Y+PL_R);
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if (tstyle > 0)
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for (d = ybeg; d <= ybounds.max+FTINY;
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d += ybounds.step) {
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t0 = rconv(d);
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mline(PL_X+t0,PL_Y-TLEN/2,0,lw,0);
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mdraw(PL_X+t0,PL_Y+TLEN/2);
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mline(PL_X-TLEN/2,PL_Y+t0,0,lw,0);
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mdraw(PL_X+TLEN/2,PL_Y+t0);
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mline(PL_X-t0,PL_Y-TLEN/2,0,lw,0);
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mdraw(PL_X-t0,PL_Y+TLEN/2);
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mline(PL_X-TLEN/2,PL_Y-t0,0,lw,0);
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mdraw(PL_X+TLEN/2,PL_Y-t0);
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}
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}
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/* grid */
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if (gparam[GRID].flags & DEFINED)
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lw = varvalue(gparam[GRID].name);
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else
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lw = DEFGRID;
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if (lw-- > 0) {
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for (d = 0.0; d < PI-FTINY; d += xbounds.step*(2*PI)/period) {
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mline((int)(PL_X+PL_R*cos(d)+.5),
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(int)(PL_Y+PL_R*sin(d)+.5),2,0,0);
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mdraw((int)(PL_X-PL_R*cos(d)+.5),
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(int)(PL_Y-PL_R*sin(d)+.5));
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}
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for (d = ybeg; d <= ybounds.max + FTINY; d += ybounds.step)
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drawcircle(PL_X,PL_Y,rconv(d),2,0,0);
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}
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}
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void
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cartaxis(void) /* print Cartesian coordinate axis */
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{
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| 290 |
int lw, t0, t1, tstyle;
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double d, xbeg, ybeg;
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char stmp[64], *fmt, *goodformat();
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| 293 |
register int i;
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| 294 |
/* get tick style */
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| 295 |
if (gparam[TSTYLE].flags & DEFINED)
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tstyle = varvalue(gparam[TSTYLE].name) + 0.5;
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else
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tstyle = DEFTSTYLE;
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/* start of numbering */
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xbeg = ceil(xbounds.min/xbounds.step)*xbounds.step;
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ybeg = ceil(ybounds.min/ybounds.step)*ybounds.step;
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/* x numbering */
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fmt = goodformat(xbounds.step);
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lw = 2*AX_L-AX_R;
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| 306 |
for (d = xbeg;
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| 307 |
d <= xbounds.max + FTINY;
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d += xbounds.step)
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if ((i = xconv(d)) >= lw+XN_S || i <= lw-XN_S) {
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| 310 |
sprintf(stmp, fmt, d);
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| 311 |
mtext(i-strlen(stmp)*(CWID/2)+XN_X,XN_Y,stmp,CPI,0);
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| 312 |
lw = i;
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| 313 |
}
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| 314 |
/* y numbering */
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| 315 |
fmt = goodformat(ybounds.step);
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| 316 |
lw = 2*AX_D-AX_U;
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| 317 |
for (d = ybeg;
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| 318 |
d <= ybounds.max + FTINY;
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| 319 |
d += ybounds.step)
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| 320 |
if ((i = yconv(d)) >= lw+YN_S || i <= lw-YN_S) {
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| 321 |
sprintf(stmp, fmt, d);
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| 322 |
mtext(YN_X-strlen(stmp)*CWID,i+YN_Y,stmp,CPI,0);
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| 323 |
lw = i;
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| 324 |
}
|
| 325 |
/* frame */
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| 326 |
if (gparam[FTHICK].flags & DEFINED)
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| 327 |
lw = varvalue(gparam[FTHICK].name) + 0.5;
|
| 328 |
else
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| 329 |
lw = DEFFTHICK;
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| 330 |
if (lw-- > 0) {
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| 331 |
mline(AX_L,AX_D,0,lw,0);
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| 332 |
mdraw(AX_R,AX_D);
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| 333 |
mdraw(AX_R,AX_U);
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| 334 |
mdraw(AX_L,AX_U);
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| 335 |
mdraw(AX_L,AX_D);
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| 336 |
switch (tstyle) {
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| 337 |
case 1: /* outside */
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| 338 |
t0 = 0; t1 = TLEN; break;
|
| 339 |
case 2: /* inside */
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| 340 |
t0 = TLEN; t1 = 0; break;
|
| 341 |
case 3: /* accross */
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| 342 |
t0 = TLEN/2; t1 = TLEN/2; break;
|
| 343 |
default: /* none */
|
| 344 |
t0 = t1 = 0; break;
|
| 345 |
}
|
| 346 |
if (t0 + t1) {
|
| 347 |
for (d = xbeg;
|
| 348 |
d <= xbounds.max + FTINY;
|
| 349 |
d += xbounds.step) {
|
| 350 |
i = xconv(d);
|
| 351 |
mline(i,AX_D+t0,0,lw,0);
|
| 352 |
mdraw(i,AX_D-t1);
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| 353 |
mline(i,AX_U-t0,0,lw,0);
|
| 354 |
mdraw(i,AX_U+t1);
|
| 355 |
}
|
| 356 |
for (d = ybeg;
|
| 357 |
d <= ybounds.max + FTINY;
|
| 358 |
d += ybounds.step) {
|
| 359 |
i = yconv(d);
|
| 360 |
mline(AX_L+t0,i,0,lw,0);
|
| 361 |
mdraw(AX_L-t1,i);
|
| 362 |
mline(AX_R-t0,i,0,lw,0);
|
| 363 |
mdraw(AX_R+t1,i);
|
| 364 |
}
|
| 365 |
}
|
| 366 |
}
|
| 367 |
/* origin */
|
| 368 |
if (gparam[OTHICK].flags & DEFINED)
|
| 369 |
lw = varvalue(gparam[OTHICK].name) + 0.5;
|
| 370 |
else
|
| 371 |
lw = DEFOTHICK;
|
| 372 |
if (lw-- > 0) {
|
| 373 |
i = yconv(0.0);
|
| 374 |
if (i >= AX_D && i <= AX_U) {
|
| 375 |
mline(AX_L,i,0,lw,0);
|
| 376 |
mdraw(AX_R,i);
|
| 377 |
if (tstyle > 0)
|
| 378 |
for (d = xbeg; d <= xbounds.max+FTINY;
|
| 379 |
d += xbounds.step) {
|
| 380 |
mline(xconv(d),i+TLEN/2,0,lw,0);
|
| 381 |
mdraw(xconv(d),i-TLEN/2);
|
| 382 |
}
|
| 383 |
}
|
| 384 |
i = xconv(0.0);
|
| 385 |
if (i >= AX_L && i <= AX_R) {
|
| 386 |
mline(i,AX_D,0,lw,0);
|
| 387 |
mdraw(i,AX_U);
|
| 388 |
if (tstyle > 0)
|
| 389 |
for (d = ybeg; d <= ybounds.max+FTINY;
|
| 390 |
d += ybounds.step) {
|
| 391 |
mline(i+TLEN/2,yconv(d),0,lw,0);
|
| 392 |
mdraw(i-TLEN/2,yconv(d));
|
| 393 |
}
|
| 394 |
}
|
| 395 |
}
|
| 396 |
/* grid */
|
| 397 |
if (gparam[GRID].flags & DEFINED)
|
| 398 |
lw = varvalue(gparam[GRID].name);
|
| 399 |
else
|
| 400 |
lw = DEFGRID;
|
| 401 |
if (lw-- > 0) {
|
| 402 |
for (d = xbeg;
|
| 403 |
d <= xbounds.max + FTINY;
|
| 404 |
d += xbounds.step) {
|
| 405 |
i = xconv(d);
|
| 406 |
mline(i,AX_D,2,0,0);
|
| 407 |
mdraw(i,AX_U);
|
| 408 |
}
|
| 409 |
for (d = ybeg;
|
| 410 |
d <= ybounds.max + FTINY;
|
| 411 |
d += ybounds.step) {
|
| 412 |
i = yconv(d);
|
| 413 |
mline(AX_L,i,2,0,0);
|
| 414 |
mdraw(AX_R,i);
|
| 415 |
}
|
| 416 |
}
|
| 417 |
}
|
| 418 |
|
| 419 |
void
|
| 420 |
plotcurves(void) /* plot the curves */
|
| 421 |
{
|
| 422 |
int i, j, k;
|
| 423 |
|
| 424 |
for (i = 0; i < MAXCUR; i++) {
|
| 425 |
nplottable = nplotted = 0;
|
| 426 |
lastx = FHUGE;
|
| 427 |
if (mgcurve(i, nextpoint) > 0 &&
|
| 428 |
cparam[i][CLABEL].flags & DEFINED) {
|
| 429 |
j = (LE_U-LE_D)/MAXCUR;
|
| 430 |
k = LE_U - i*j;
|
| 431 |
mtext(LE_L+(LE_R-LE_L)/8,k+j/3,
|
| 432 |
cparam[i][CLABEL].v.s,CPI,0);
|
| 433 |
cmsymbol(i,LE_L,k);
|
| 434 |
if (cmline(i,LE_L,k) == 0)
|
| 435 |
mdraw(LE_R-(LE_R-LE_L)/4,k);
|
| 436 |
}
|
| 437 |
}
|
| 438 |
}
|
| 439 |
|
| 440 |
void
|
| 441 |
nextpoint( /* plot the next point for c */
|
| 442 |
register int c,
|
| 443 |
double x,
|
| 444 |
double y
|
| 445 |
)
|
| 446 |
{
|
| 447 |
if (inbounds(x, y)) {
|
| 448 |
|
| 449 |
if (!(cparam[c][CNPOINTS].flags & DEFINED) ||
|
| 450 |
nplotted * npltbl[c] <= nplottable *
|
| 451 |
(int)varvalue(cparam[c][CNPOINTS].name) ) {
|
| 452 |
csymbol(c, x, y);
|
| 453 |
nplotted++;
|
| 454 |
}
|
| 455 |
nplottable++;
|
| 456 |
if (lastx != FHUGE)
|
| 457 |
climline(c, x, y, lastx, lasty);
|
| 458 |
|
| 459 |
} else if (inbounds(lastx, lasty)) {
|
| 460 |
|
| 461 |
climline(c, lastx, lasty, x, y);
|
| 462 |
|
| 463 |
}
|
| 464 |
lastx = x;
|
| 465 |
lasty = y;
|
| 466 |
}
|
| 467 |
|
| 468 |
|
| 469 |
void
|
| 470 |
stretchbounds( /* stretch our boundaries */
|
| 471 |
int c,
|
| 472 |
double x,
|
| 473 |
double y
|
| 474 |
)
|
| 475 |
{
|
| 476 |
if (gparam[XMIN].flags & DEFINED &&
|
| 477 |
x < xbounds.min)
|
| 478 |
return;
|
| 479 |
if (gparam[XMAX].flags & DEFINED &&
|
| 480 |
x > xbounds.max)
|
| 481 |
return;
|
| 482 |
if (gparam[YMIN].flags & DEFINED &&
|
| 483 |
y < ybounds.min)
|
| 484 |
return;
|
| 485 |
if (gparam[YMAX].flags & DEFINED &&
|
| 486 |
y > ybounds.max)
|
| 487 |
return;
|
| 488 |
|
| 489 |
if (x < xbounds.min)
|
| 490 |
xbounds.min = x;
|
| 491 |
if (x > xbounds.max)
|
| 492 |
xbounds.max = x;
|
| 493 |
if (y < ybounds.min)
|
| 494 |
ybounds.min = y;
|
| 495 |
if (y > ybounds.max)
|
| 496 |
ybounds.max = y;
|
| 497 |
|
| 498 |
npltbl[c]++;
|
| 499 |
}
|
| 500 |
|
| 501 |
|
| 502 |
#define exp10(x) exp((x)*2.3025850929940456)
|
| 503 |
|
| 504 |
double
|
| 505 |
goodstep( /* determine a good step for the interval */
|
| 506 |
double interval
|
| 507 |
)
|
| 508 |
{
|
| 509 |
static int steps[] = {50, 20, 10, 5, 2, 1};
|
| 510 |
double fact, exp(), log10(), floor();
|
| 511 |
int i;
|
| 512 |
|
| 513 |
if (interval <= FTINY)
|
| 514 |
return(1.0);
|
| 515 |
fact = exp10(floor(log10(interval)))/10;
|
| 516 |
interval /= fact * MINDIVS;
|
| 517 |
for (i = 0; interval < steps[i]; i++)
|
| 518 |
;
|
| 519 |
return(steps[i] * fact);
|
| 520 |
}
|
| 521 |
|
| 522 |
#undef exp10
|
| 523 |
|
| 524 |
|
| 525 |
int
|
| 526 |
xconv( /* convert x to meta coords */
|
| 527 |
double x
|
| 528 |
)
|
| 529 |
{
|
| 530 |
if (gparam[XMAP].flags & DEFINED)
|
| 531 |
x = funvalue(gparam[XMAP].name, 1, &x);
|
| 532 |
x = (x - axbegin)/axsize;
|
| 533 |
return( AX_L + (int)(x*(AX_R-AX_L)) );
|
| 534 |
}
|
| 535 |
|
| 536 |
|
| 537 |
int
|
| 538 |
yconv( /* convert y to meta coords */
|
| 539 |
double y
|
| 540 |
)
|
| 541 |
{
|
| 542 |
if (gparam[YMAP].flags & DEFINED)
|
| 543 |
y = funvalue(gparam[YMAP].name, 1, &y);
|
| 544 |
y = (y - aybegin)/aysize;
|
| 545 |
return( AX_D + (int)(y*(AX_U-AX_D)) );
|
| 546 |
}
|
| 547 |
|
| 548 |
|
| 549 |
void
|
| 550 |
pconv( /* convert theta and radius to meta coords */
|
| 551 |
int *xp,
|
| 552 |
int *yp,
|
| 553 |
double t,
|
| 554 |
double r
|
| 555 |
)
|
| 556 |
{
|
| 557 |
t *= (2.*PI)/period;
|
| 558 |
r = rconv(r);
|
| 559 |
*xp = r*cos(t) + (PL_X+.5);
|
| 560 |
*yp = r*sin(t) + (PL_Y+.5);
|
| 561 |
}
|
| 562 |
|
| 563 |
|
| 564 |
int
|
| 565 |
rconv( /* convert radius to meta coords */
|
| 566 |
double r
|
| 567 |
)
|
| 568 |
{
|
| 569 |
if (gparam[YMAP].flags & DEFINED)
|
| 570 |
r = funvalue(gparam[YMAP].name, 1, &r);
|
| 571 |
|
| 572 |
return((r - aybegin)*PL_R/aysize + .5);
|
| 573 |
}
|
| 574 |
|
| 575 |
|
| 576 |
void
|
| 577 |
boxstring( /* put string in box */
|
| 578 |
int xmin,
|
| 579 |
int ymin,
|
| 580 |
int xmax,
|
| 581 |
int ymax,
|
| 582 |
char *s,
|
| 583 |
int d,
|
| 584 |
int width,
|
| 585 |
int color
|
| 586 |
)
|
| 587 |
{
|
| 588 |
register long size;
|
| 589 |
|
| 590 |
if (d == 'u' || d == 'd') { /* up or down */
|
| 591 |
size = strlen(s)*(xmax-xmin)/ASPECT;
|
| 592 |
size -= ymax-ymin;
|
| 593 |
size /= 2;
|
| 594 |
if (size < 0) { /* center */
|
| 595 |
ymin -= size;
|
| 596 |
ymax += size;
|
| 597 |
}
|
| 598 |
} else { /* left or right */
|
| 599 |
size = strlen(s)*(ymax-ymin)/ASPECT;
|
| 600 |
size -= xmax-xmin;
|
| 601 |
size /= 2;
|
| 602 |
if (size < 0) { /* center */
|
| 603 |
xmin -= size;
|
| 604 |
xmax += size;
|
| 605 |
}
|
| 606 |
}
|
| 607 |
mvstr(xmin, ymin, xmax, ymax, s, d, width, color); /* print */
|
| 608 |
}
|
| 609 |
|
| 610 |
|
| 611 |
char *
|
| 612 |
goodformat( /* return a suitable format string for d */
|
| 613 |
double d
|
| 614 |
)
|
| 615 |
{
|
| 616 |
static char *f[5] = {"%.0f", "%.1f", "%.2f", "%.3f", "%.4f"};
|
| 617 |
double floor();
|
| 618 |
register int i;
|
| 619 |
|
| 620 |
if (d < 0.0)
|
| 621 |
d = -d;
|
| 622 |
if (d > 1e-4 && d < 1e6)
|
| 623 |
for (i = 0; i < 5; i++) {
|
| 624 |
if (d - floor(d+FTINY) <= FTINY)
|
| 625 |
return(f[i]);
|
| 626 |
d *= 10.0;
|
| 627 |
}
|
| 628 |
return("%.1e");
|
| 629 |
}
|
| 630 |
|
| 631 |
|
| 632 |
void
|
| 633 |
drawcircle( /* draw a circle */
|
| 634 |
int x,
|
| 635 |
int y,
|
| 636 |
int r,
|
| 637 |
int typ,
|
| 638 |
int wid,
|
| 639 |
int col
|
| 640 |
)
|
| 641 |
{
|
| 642 |
double d;
|
| 643 |
|
| 644 |
if (r <= 0)
|
| 645 |
return;
|
| 646 |
mline(x+r, y, typ, wid, col);
|
| 647 |
for (d = 2*PI*PL_F; d <= 2*PI+FTINY; d += 2*PI*PL_F)
|
| 648 |
mdraw((int)(x+r*cos(d)+.5), (int)(y+r*sin(d)+.5));
|
| 649 |
}
|
| 650 |
|
| 651 |
|
| 652 |
void
|
| 653 |
climline( /* print line from/to out of bounds */
|
| 654 |
int c,
|
| 655 |
double x,
|
| 656 |
double y,
|
| 657 |
double xout,
|
| 658 |
double yout
|
| 659 |
)
|
| 660 |
{
|
| 661 |
for ( ; ; )
|
| 662 |
if (xout < xbounds.min) {
|
| 663 |
yout = y + (yout - y)*(xbounds.min - x)/(xout - x);
|
| 664 |
xout = xbounds.min;
|
| 665 |
} else if (yout < ybounds.min) {
|
| 666 |
xout = x + (xout - x)*(ybounds.min - y)/(yout - y);
|
| 667 |
yout = ybounds.min;
|
| 668 |
} else if (xout > xbounds.max) {
|
| 669 |
yout = y + (yout - y)*(xbounds.max - x)/(xout - x);
|
| 670 |
xout = xbounds.max;
|
| 671 |
} else if (yout > ybounds.max) {
|
| 672 |
xout = x + (xout - x)*(ybounds.max - y)/(yout - y);
|
| 673 |
yout = ybounds.max;
|
| 674 |
} else {
|
| 675 |
cline(c, x, y, xout, yout);
|
| 676 |
break;
|
| 677 |
}
|
| 678 |
}
|
| 679 |
|
| 680 |
|
| 681 |
void
|
| 682 |
cline( /* print a curve line */
|
| 683 |
int c,
|
| 684 |
double u1,
|
| 685 |
double v1,
|
| 686 |
double u2,
|
| 687 |
double v2
|
| 688 |
)
|
| 689 |
{
|
| 690 |
int x, y;
|
| 691 |
double ustep, vstep;
|
| 692 |
|
| 693 |
if (period > FTINY) { /* polar */
|
| 694 |
if (u1 > u2) {
|
| 695 |
ustep = u1; u1 = u2; u2 = ustep;
|
| 696 |
vstep = v1; v1 = v2; v2 = vstep;
|
| 697 |
}
|
| 698 |
pconv(&x, &y, u1, v1);
|
| 699 |
if (cmline(c, x, y) < 0)
|
| 700 |
return;
|
| 701 |
ustep = period*PL_F;
|
| 702 |
if (u2-u1 > ustep) {
|
| 703 |
vstep = ustep*(v2-v1)/(u2-u1);
|
| 704 |
while ((u1 += ustep) < u2) {
|
| 705 |
v1 += vstep;
|
| 706 |
pconv(&x, &y, u1, v1);
|
| 707 |
mdraw(x, y);
|
| 708 |
}
|
| 709 |
}
|
| 710 |
pconv(&x, &y, u2, v2);
|
| 711 |
mdraw(x, y);
|
| 712 |
} else if (cmline(c, xconv(u1), yconv(v1)) == 0)
|
| 713 |
mdraw(xconv(u2), yconv(v2));
|
| 714 |
}
|
| 715 |
|
| 716 |
|
| 717 |
int
|
| 718 |
cmline( /* start curve line in meta coords */
|
| 719 |
int c,
|
| 720 |
int x,
|
| 721 |
int y
|
| 722 |
)
|
| 723 |
{
|
| 724 |
int lw, lt, col;
|
| 725 |
register VARIABLE *cv;
|
| 726 |
|
| 727 |
cv = cparam[c];
|
| 728 |
if (cv[CLINTYPE].flags & DEFINED)
|
| 729 |
lt = varvalue(cv[CLINTYPE].name);
|
| 730 |
else
|
| 731 |
lt = DEFLINTYPE;
|
| 732 |
if (lt-- <= 0)
|
| 733 |
return(-1);
|
| 734 |
if (cv[CTHICK].flags & DEFINED)
|
| 735 |
lw = varvalue(cv[CTHICK].name);
|
| 736 |
else
|
| 737 |
lw = DEFTHICK;
|
| 738 |
if (lw-- <= 0)
|
| 739 |
return(-1);
|
| 740 |
if (cv[CCOLOR].flags & DEFINED)
|
| 741 |
col = varvalue(cv[CCOLOR].name);
|
| 742 |
else
|
| 743 |
col = DEFCOLOR;
|
| 744 |
if (col-- <= 0)
|
| 745 |
return(-1);
|
| 746 |
mline(x, y, lt, lw, col);
|
| 747 |
return(0);
|
| 748 |
}
|
| 749 |
|
| 750 |
|
| 751 |
void
|
| 752 |
csymbol( /* plot curve symbol */
|
| 753 |
int c,
|
| 754 |
double u,
|
| 755 |
double v
|
| 756 |
)
|
| 757 |
{
|
| 758 |
int x, y;
|
| 759 |
|
| 760 |
if (period > FTINY) {
|
| 761 |
pconv(&x, &y, u, v);
|
| 762 |
cmsymbol(c, x, y);
|
| 763 |
} else
|
| 764 |
cmsymbol(c, xconv(u), yconv(v));
|
| 765 |
}
|
| 766 |
|
| 767 |
|
| 768 |
void
|
| 769 |
cmsymbol( /* print curve symbol in meta coords */
|
| 770 |
int c,
|
| 771 |
int x,
|
| 772 |
int y
|
| 773 |
)
|
| 774 |
{
|
| 775 |
int col, ss;
|
| 776 |
register VARIABLE *cv;
|
| 777 |
|
| 778 |
cv = cparam[c];
|
| 779 |
if (!(cv[CSYMTYPE].flags & DEFINED))
|
| 780 |
return;
|
| 781 |
if (cv[CSYMSIZE].flags & DEFINED)
|
| 782 |
ss = varvalue(cv[CSYMSIZE].name);
|
| 783 |
else
|
| 784 |
ss = DEFSYMSIZE;
|
| 785 |
if (ss <= 0)
|
| 786 |
return;
|
| 787 |
if (cv[CCOLOR].flags & DEFINED)
|
| 788 |
col = varvalue(cv[CCOLOR].name);
|
| 789 |
else
|
| 790 |
col = DEFCOLOR;
|
| 791 |
if (col-- <= 0)
|
| 792 |
return;
|
| 793 |
msegment(x-ss,y-ss,x+ss,y+ss,
|
| 794 |
cv[CSYMTYPE].v.s,'r',0,col);
|
| 795 |
}
|
| 796 |
|
| 797 |
|
| 798 |
int
|
| 799 |
inbounds( /* determine if x and y are within gbounds */
|
| 800 |
double x,
|
| 801 |
double y
|
| 802 |
)
|
| 803 |
{
|
| 804 |
if (x < xbounds.min || x > xbounds.max)
|
| 805 |
return(0);
|
| 806 |
if (y < ybounds.min || y > ybounds.max)
|
| 807 |
return(0);
|
| 808 |
return(1);
|
| 809 |
}
|
