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- #ifndef lint
- static char *RCSid = "$Id: plot3d.c,v 1.15 1995/12/02 21:16:43 drd Exp $";
- #endif
-
-
- /* GNUPLOT - command.c */
- /*
- * Copyright (C) 1986 - 1993 Thomas Williams, Colin Kelley
- *
- * Permission to use, copy, and distribute this software and its documentation
- * for any purpose with or without fee is hereby granted, provided that the
- * above copyright notice appear in all copies and that both that copyright
- * notice and this permission notice appear in supporting documentation.
- *
- * Permission to modify the software is granted, but not the right to distribute
- * the modified code. Modifications are to be distributed as patches to
- * released version.
- *
- * This software is provided "as is" without express or implied warranty.
- *
- *
- * AUTHORS
- *
- * Original Software: Thomas Williams, Colin Kelley.
- *
- * Gnuplot 2.0 additions: Russell Lang, Dave Kotz, John Campbell.
- *
- * Gnuplot 3.0 additions: Gershon Elber and many others.
- *
- * formerly part of command.c
- *
- * There is a mailing list for gnuplot users. Note, however, that the
- * newsgroup
- * comp.graphics.gnuplot
- * is identical to the mailing list (they
- * both carry the same set of messages). We prefer that you read the
- * messages through that newsgroup, to subscribing to the mailing list.
- * (If you can read that newsgroup, and are already on the mailing list,
- * please send a message info-gnuplot-request@dartmouth.edu, asking to be
- * removed from the mailing list.)
- *
- * The address for mailing to list members is
- * info-gnuplot@dartmouth.edu
- * and for mailing administrative requests is
- * info-gnuplot-request@dartmouth.edu
- * The mailing list for bug reports is
- * bug-gnuplot@dartmouth.edu
- * The list of those interested in beta-test versions is
- * info-gnuplot-beta@dartmouth.edu
- */
-
- #include <math.h>
- #include <ctype.h>
- #include <assert.h>
-
- #include "plot.h"
- #include "setshow.h"
- #include "binary.h"
- #ifndef _Windows
- #include "help.h"
- #else
- #define MAXSTR 255
- #endif
-
- #if defined(ATARI) || defined(MTOS)
- #ifdef __PUREC__
- #include <ext.h>
- #include <tos.h>
- #include <aes.h>
- #include <float.h> /* get FLT_MAX */
- #else
- #include <osbind.h>
- #include <aesbind.h>
- #endif /* __PUREC__ */
- #endif /* ATARI || MTOS */
-
- #ifndef STDOUT
- #define STDOUT 1
- #endif
-
-
- #define inrange(z,min,max) ((min<max) ? ((z>=min)&&(z<=max)) : ((z>=max)&&(z<=min)) )
-
-
- /* static prototypes */
-
- static void get_3ddata __P((struct surface_points *this_plot));
- static void print_3dtable __P((int pcount));
- static void eval_3dplots __P((void));
- static void grid_nongrid_data __P((struct surface_points *this_plot));
- static void parametric_3dfixup __P((struct surface_points *start_plot, int *plot_num));
-
- /* the curves/surfaces of the plot */
- struct surface_points *first_3dplot = NULL;
- static struct udft_entry plot_func;
-
-
- extern struct udft_entry *dummy_func;
- extern int datatype[];
- extern char timefmt[];
- extern TBOOLEAN is_3d_plot;
- extern int plot_token;
-
- /* in order to support multiple axes, and to
- * simplify ranging in parametric plots, we use
- * arrays to store some things. For 2d plots,
- * elements are y1=0 x1=1 y2=2 x2=3
- * for 3d, z=0, x=1, y=2
- * these are given symbolic names in plot.h
- */
-
- extern double min_array[AXIS_ARRAY_SIZE], max_array[AXIS_ARRAY_SIZE];
- extern int auto_array[AXIS_ARRAY_SIZE];
- extern TBOOLEAN log_array[AXIS_ARRAY_SIZE];
- extern double base_array[AXIS_ARRAY_SIZE];
- extern double log_base_array[AXIS_ARRAY_SIZE];
-
- /* some file-wide variables to store which axis we are using */
- static int x_axis, y_axis, z_axis;
-
-
- /* info from datafile module */
- extern int df_datum;
- extern int df_line_number;
- extern int df_no_use_specs;
- extern int df_eof;
- extern int df_timecol[];
- extern TBOOLEAN df_binary;
-
- #ifndef min
- #define min(a,b) ((a)>(b) ? (b) : (a))
- #endif
- #define Inc_c_token if (++c_token >= num_tokens) \
- int_error ("Syntax error", c_token);
-
- extern int reverse_range[];
-
- /*
- * IMHO, code is getting too cluttered with repeated chunks of
- * code. Some macros to simplify, I hope.
- *
- * do { } while(0) is comp.lang.c recommendation for complex macros
- * also means that break can be specified as an action, and it will
- *
- */
-
- /* copy scalar data to arrays
- * optimiser should optimise infinite away
- * dont know we have to support ranges [10:-10] - lets reverse
- * it for now, then fix it at the end.
- */
- #define INIT_ARRAYS(axis, min, max, auto, is_log, base, log_base, infinite) \
- do{if ((auto_array[axis]=auto)==0 && max<min) {\
- min_array[axis]=max;\
- max_array[axis]=min; /* we will fix later */ \
- } else { \
- min_array[axis]=(infinite && (auto&1)) ? VERYLARGE : min; \
- max_array[axis]=(infinite && (auto&2)) ? -VERYLARGE : max; \
- } \
- log_array[axis]=is_log; base_array[axis]=base; log_base_array[axis]=log_base;\
- }while(0)
-
- /* handle reversed ranges */
- #define CHECK_REVERSE(axis) \
- do{\
- if (auto_array[axis]==0 && max_array[axis] < min_array[axis]) {\
- double temp=min_array[axis]; min_array[axis]=max_array[axis]; max_array[axis]=temp;\
- reverse_range[axis]=1; \
- } else reverse_range[axis] = (range_flags[axis]&RANGE_REVERSE); \
- }while(0)
-
-
- /* get optional [min:max] */
- #define LOAD_RANGE(axis) \
- do {\
- if (equals(c_token, "[")) { \
- c_token++; \
- auto_array[axis] = load_range(axis,&min_array[axis], &max_array[axis], auto_array[axis]);\
- if (!equals(c_token, "]"))\
- int_error("']' expected", c_token);\
- c_token++;\
- }\
- } while (0)
-
-
- /* store VALUE or log(VALUE) in STORE, set TYPE as appropriate
- * Do OUT_ACTION or UNDEF_ACTION as appropriate
- * adjust range provided type is INRANGE (ie dont adjust y if x is outrange
- * VALUE must not be same as STORE
- */
-
- #define STORE_WITH_LOG_AND_FIXUP_RANGE(STORE, VALUE, TYPE, AXIS, OUT_ACTION, UNDEF_ACTION)\
- do { if (log_array[AXIS]) { if (VALUE<0.0) {TYPE=UNDEFINED; UNDEF_ACTION; break;} \
- else if (VALUE==0.0){STORE=-VERYLARGE; TYPE=OUTRANGE; OUT_ACTION; break;} \
- else { STORE=log(VALUE)/log_base_array[AXIS]; } \
- } else STORE=VALUE; \
- if (TYPE != INRANGE) break; /* dont set y range if x is outrange, for example */ \
- if ( VALUE<min_array[AXIS] ) \
- if (auto_array[AXIS] & 1) min_array[AXIS]=VALUE; else { TYPE=OUTRANGE; OUT_ACTION; break; } \
- if ( VALUE>max_array[AXIS] ) \
- if (auto_array[AXIS] & 2) max_array[AXIS]=VALUE; else { TYPE=OUTRANGE; OUT_ACTION; } \
- } while(0)
-
- /* use this instead empty macro arguments to work around NeXT cpp bug */
- /* if this fails on any system, we might use ((void)0) */
- #define NOOP /* */
-
- /* check axis range is not too small -
- * extend if you can (autoscale), else report error
- */
- #ifdef ANSI_C
- # define STRINGIFY(x) #x
- # define RANGE_MSG(x) #x " range is less than `zero`"
- #else
- # define STRINGIFY(x) "x"
- # define RANGE_MSG(x) "x range is less than `zero`"
- #endif
-
- #define FIXUP_RANGE(AXIS, WHICH) \
- do{if (fabs(max_array[AXIS] - min_array[AXIS]) < zero) \
- if (auto_array[AXIS]) { /* widen range */ \
- fprintf(stderr, "Warning: empty %s range [%g:%g], ", STRINGIFY(WHICH), min_array[AXIS], max_array[AXIS]); \
- if (fabs(min_array[AXIS]) < zero) { \
- if (auto_array[AXIS] & 1) min_array[AXIS] = -1.0; \
- if (auto_array[AXIS] & 2) max_array[AXIS] = 1.0; \
- } else if (max_array[AXIS] < 0) { \
- if (auto_array[AXIS] & 1) min_array[AXIS] *= 1.1; if (auto_array[AXIS] & 2) max_array[AXIS] *= 0.9; \
- } else { if (auto_array[AXIS] & 1) min_array[AXIS] *= 0.9; if (auto_array[AXIS] & 2) max_array[AXIS] *= 1.1; } \
- fprintf(stderr, "adjusting to [%g:%g]\n", min_array[AXIS], max_array[AXIS]); \
- } else int_error(RANGE_MSG(WHICH), c_token); \
- }while(0)
-
- /* check range and take logs of min and max if logscale
- * this also restores min and max for ranges like [10:-10]
- */
-
- #define FIXUP_RANGE_FOR_LOG(AXIS, WHICH) \
- do { if (reverse_range[AXIS]) { \
- double temp = min_array[AXIS]; \
- min_array[AXIS]=max_array[AXIS]; \
- max_array[AXIS]=temp; \
- }\
- if (log_array[AXIS]) { \
- if (min_array[AXIS]<=0.0 || max_array[AXIS]<=0.0) \
- int_error(RANGE_MSG(WHICH), NO_CARET); \
- min_array[AXIS] = log(min_array[AXIS])/log_base_array[AXIS]; \
- max_array[AXIS] = log(max_array[AXIS])/log_base_array[AXIS]; \
- } } while(0)
-
-
-
- /* support for dynamic size of input line */
-
- void plot3drequest()
- /*
- * in the parametric case we would say splot [u= -Pi:Pi] [v= 0:2*Pi] [-1:1]
- * [-1:1] [-1:1] sin(v)*cos(u),sin(v)*cos(u),sin(u) in the non-parametric
- * case we would say only splot [x= -2:2] [y= -5:5] sin(x)*cos(y)
- *
- */
- {
- TBOOLEAN changed;
- int dummy_token0 = -1, dummy_token1 = -1;
-
- is_3d_plot = TRUE;
-
- if (parametric && strcmp(dummy_var[0], "t") == 0) {
- strcpy(dummy_var[0], "u");
- strcpy(dummy_var[1], "v");
- }
- autoscale_lx = autoscale_x;
- autoscale_ly = autoscale_y;
- autoscale_lz = autoscale_z;
-
- if (!term) /* unknown */
- int_error("use 'set term' to set terminal type first", c_token);
-
- if (equals(c_token, "[")) {
- c_token++;
- if (isletter(c_token)) {
- if (equals(c_token + 1, "=")) {
- dummy_token0 = c_token;
- c_token += 2;
- } else {
- /* oops; probably an expression with a variable. */
- /* Parse it as an xmin expression. */
- /* used to be: int_error("'=' expected",c_token); */
- }
- }
- changed = parametric ? load_range(U_AXIS,&umin, &umax, autoscale_lu) : load_range(FIRST_X_AXIS,&xmin, &xmax, autoscale_lx);
- if (!equals(c_token, "]"))
- int_error("']' expected", c_token);
- c_token++;
- /* if (changed) */
- if(parametric)
- /* autoscale_lu = FALSE; */
- autoscale_lu = changed;
- else
- /* autoscale_lx = FALSE; */
- autoscale_lx = changed;
- }
- if (equals(c_token, "[")) {
- c_token++;
- if (isletter(c_token)) {
- if (equals(c_token + 1, "=")) {
- dummy_token1 = c_token;
- c_token += 2;
- } else {
- /* oops; probably an expression with a variable. */
- /* Parse it as an xmin expression. */
- /* used to be: int_error("'=' expected",c_token); */
- }
- }
- changed = parametric ? load_range(V_AXIS,&vmin, &vmax, autoscale_lv) : load_range(FIRST_Y_AXIS,&ymin, &ymax, autoscale_ly);
- if (!equals(c_token, "]"))
- int_error("']' expected", c_token);
- c_token++;
- /* if (changed) */
- if(parametric)
- /* autoscale_lv = FALSE; */
- autoscale_lv = changed;
- else
- /* autoscale_ly = FALSE; */
- autoscale_ly = changed;
- }
-
- if (parametric) {
- if (equals(c_token, "[")) { /* set optional x (parametric) or z ranges */
- c_token++;
- autoscale_lx = load_range(FIRST_X_AXIS,&xmin, &xmax, autoscale_lx);
- if (!equals(c_token, "]"))
- int_error("']' expected", c_token);
- c_token++;
- }
- if (equals(c_token, "[")) { /* set optional y ranges */
- c_token++;
- autoscale_ly = load_range(FIRST_Y_AXIS,&ymin, &ymax, autoscale_ly);
- if (!equals(c_token, "]"))
- int_error("']' expected", c_token);
- c_token++;
- }
- } /* parametric */
-
- if (equals(c_token, "[")) { /* set optional z ranges */
- c_token++;
- autoscale_lz = load_range(FIRST_Z_AXIS,&zmin, &zmax, autoscale_lz);
- if (!equals(c_token, "]"))
- int_error("']' expected", c_token);
- c_token++;
- }
-
- CHECK_REVERSE(FIRST_X_AXIS);
- CHECK_REVERSE(FIRST_Y_AXIS);
- CHECK_REVERSE(FIRST_Z_AXIS);
-
- /* use the default dummy variable unless changed */
- if (dummy_token0 >= 0)
- copy_str(c_dummy_var[0], dummy_token0, MAX_ID_LEN);
- else
- (void) strcpy(c_dummy_var[0], dummy_var[0]);
-
- if (dummy_token1 >= 0)
- copy_str(c_dummy_var[1], dummy_token1, MAX_ID_LEN);
- else
- (void) strcpy(c_dummy_var[1], dummy_var[1]);
-
- eval_3dplots();
- }
-
-
- static void grid_nongrid_data(this_plot)
- struct surface_points *this_plot;
- {
- int i, j, k;
- double x, y, z, w, dx, dy, xmin, xmax, ymin, ymax;
- struct iso_curve *old_iso_crvs = this_plot->iso_crvs;
- struct iso_curve *icrv, *oicrv, *oicrvs;
-
- /* Compute XY bounding box on the original data. */
- xmin = xmax = old_iso_crvs->points[0].x;
- ymin = ymax = old_iso_crvs->points[0].y;
- for (icrv = old_iso_crvs; icrv != NULL; icrv = icrv->next) {
- struct coordinate GPHUGE *points = icrv->points;
-
- for (i = 0; i < icrv->p_count; i++, points++) {
- if (xmin > points->x)
- xmin = points->x;
- if (xmax < points->x)
- xmax = points->x;
- if (ymin > points->y)
- ymin = points->y;
- if (ymax < points->y)
- ymax = points->y;
- }
- }
-
- dx = (xmax - xmin) / (dgrid3d_col_fineness - 1);
- dy = (ymax - ymin) / (dgrid3d_row_fineness - 1);
-
- /* Create the new grid structure, and compute the low pass filtering from
- * non grid to grid structure.
- */
- this_plot->iso_crvs = NULL;
- this_plot->num_iso_read = dgrid3d_col_fineness;
- this_plot->has_grid_topology = TRUE;
- for (i = 0, x = xmin; i < dgrid3d_col_fineness; i++, x += dx) {
- struct coordinate GPHUGE *points;
-
- icrv = iso_alloc(dgrid3d_row_fineness + 1);
- icrv->p_count = dgrid3d_row_fineness;
- icrv->next = this_plot->iso_crvs;
- this_plot->iso_crvs = icrv;
- points = icrv->points;
-
- for (j = 0, y = ymin; j < dgrid3d_row_fineness; j++, y += dy, points++) {
- z = w = 0.0;
-
- for (oicrv = old_iso_crvs; oicrv != NULL; oicrv = oicrv->next) {
- struct coordinate GPHUGE *opoints = oicrv->points;
- for (k = 0; k < oicrv->p_count; k++, opoints++) {
- double dist,
- dist_x = fabs( opoints->x - x ),
- dist_y = fabs( opoints->y - y );
-
- switch (dgrid3d_norm_value) {
- case 1:
- dist = dist_x + dist_y;
- break;
- case 2:
- dist = dist_x * dist_x + dist_y * dist_y;
- break;
- case 4:
- dist = dist_x * dist_x + dist_y * dist_y;
- dist *= dist;
- break;
- case 8:
- dist = dist_x * dist_x + dist_y * dist_y;
- dist *= dist;
- dist *= dist;
- break;
- case 16:
- dist = dist_x * dist_x + dist_y * dist_y;
- dist *= dist;
- dist *= dist;
- dist *= dist;
- break;
- default:
- dist = pow( dist_x, (double)dgrid3d_norm_value ) +
- pow( dist_y, (double)dgrid3d_norm_value );
- break;
- }
-
- /* The weight of this point is inverse proportional
- * to the distance.
- */
- if ( dist == 0.0 )
- #if !defined(AMIGA_SC_6_1) && !defined(__PUREC__)
- dist = VERYLARGE;
- #else /* !AMIGA_SC_6_1 && !__PUREC__ */
- /* Multiplying VERYLARGE by opoints->z below
- * might yield Inf (i.e. a number that can't
- * be represented on the machine). This will
- * result in points->z being set to NaN. It's
- * better to have a pretty large number that is
- * also on the safe side... The numbers that are
- * read by gnuplot are float values anyway, so
- * they can't be bigger than FLT_MAX. So setting
- * dist to FLT_MAX^2 will make dist pretty large
- * with respect to any value that has been read. */
- dist = ((double)FLT_MAX)*((double)FLT_MAX);
- #endif /* !AMIGA_SC_6_1 && !__PUREC__ */
- else
- dist = 1.0 / dist;
-
- z += opoints->z * dist;
- w += dist;
- }
- }
-
- points->x = x;
- points->y = y;
- points->z = z / w;
- points->type = INRANGE;
- }
- }
-
- /* Delete the old non grid data. */
- for (oicrvs = old_iso_crvs; oicrvs != NULL;) {
- oicrv = oicrvs;
- oicrvs = oicrvs->next;
- iso_free(oicrv);
- }
- }
-
- static void get_3ddata(this_plot)
- struct surface_points *this_plot;
- /* this_plot->token is end of datafile spec, before title etc
- * will be moved passed title etc after we return
- */
- {
- int xdatum=0;
- int ydatum=0;
- int i,j;
- double v[3];
- int pt_in_iso_crv=0;
- struct iso_curve *this_iso;
-
- if (mapping3d == MAP3D_CARTESIAN)
- { if (df_no_use_specs == 2)
- int_error("Need 1 or 3 columns for cartesian data", this_plot->token);
- }
- else
- {
- if (df_no_use_specs == 1)
- int_error("Need 2 or 3 columns for polar data", this_plot->token);
- }
-
- this_plot->num_iso_read = 0;
- this_plot->has_grid_topology = TRUE;
-
- /* we ought to keep old memory - most likely case
- * is a replot, so it will probably exactly fit into
- * memory already allocated ?
- */
- if (this_plot->iso_crvs != NULL) {
- struct iso_curve *icrv, *icrvs = this_plot->iso_crvs;
-
- while (icrvs) {
- icrv = icrvs;
- icrvs = icrvs->next;
- iso_free(icrv);
- }
- this_plot->iso_crvs = NULL;
- }
-
- /* data file is already open */
-
- if (df_binary)
- xdatum=df_3dbinary(this_plot);
- else {
- /*{{{ read surface from text file*/
- struct iso_curve *this_iso=iso_alloc(samples);
- struct coordinate GPHUGE *cp;
- double x,y,z;
-
- while ((j=df_readline(v,3)) != DF_EOF) {
- if (j==DF_SECOND_BLANK)
- break; /* two blank lines */
- if (j==DF_FIRST_BLANK) {
- /* one blank line */
- if (pt_in_iso_crv == 0) {
- if (xdatum == 0)
- continue;
- pt_in_iso_crv = xdatum;
- }
- if (xdatum > 0) {
- this_iso->p_count = xdatum;
- this_iso->next = this_plot->iso_crvs;
- this_plot->iso_crvs = this_iso;
- this_plot->num_iso_read++;
-
- if (xdatum != pt_in_iso_crv)
- this_plot->has_grid_topology = FALSE;
-
- this_iso = iso_alloc(pt_in_iso_crv);
- xdatum = 0;
- ydatum++;
- }
- continue;
- }
-
- /* its a data point or undefined */
-
- if (xdatum >= this_iso->p_max) {
- /*
- * overflow about to occur. Extend size of points[] array. We
- * either double the size, or add 1000 points, whichever is a
- * smaller increment. Note i=p_max.
- */
- iso_extend(this_iso,
- xdatum + (xdatum < 1000 ? xdatum : 1000));
- }
-
- cp = this_iso->points + xdatum;
-
- if (j==DF_UNDEFINED) {
- cp->type=UNDEFINED;
- continue;
- }
-
- cp->type=INRANGE; /* unless we find out different */
-
- switch(mapping3d) {
- case MAP3D_CARTESIAN:
- switch(j) {
- case 1:
- x = xdatum;
- y = ydatum;
- z = v[0];
- break;
- case 3:
- x = v[0];
- y = v[1];
- z = v[2];
- break;
- default:
- {
- char msg[80];
- sprintf(msg, "Need 1 or 3 columns - line %d", df_line_number);
- int_error(msg, this_plot->token);
- return; /* avoid gcc -Wuninitialised for x,y,z */
- }
- }
- break;
- case MAP3D_SPHERICAL:
- if (j<2)
- int_error("Need 2 or 3 columns", this_plot->token);
- if (j<3)
- v[2]=1; /* default radius */
- if (angles_format == ANGLES_DEGREES) {
- v[0] *= DEG2RAD; /* Convert to radians. */
- v[1] *= DEG2RAD;
- }
- x = v[2]*cos(v[0]) * cos(v[1]);
- y = v[2]*sin(v[0]) * cos(v[1]);
- z = v[2]*sin(v[1]);
- break;
- case MAP3D_CYLINDRICAL:
- if (j<2)
- int_error("Need 2 or 3 columns", this_plot->token);
- if (j<3)
- v[2]=1; /* default radius */
- if (angles_format == ANGLES_DEGREES) {
- v[0] *= DEG2RAD; /* Convert to radians. */
- }
- x = v[2]*cos(v[0]);
- y = v[2]*sin(v[0]);
- z = v[1];
- break;
- default:
- int_error("Internal error : Unknown mapping type", NO_CARET);
- return;
- }
-
- /* adjust for logscales. Set min/max and point types. store in cp */
- cp->type=INRANGE;
- /* cannot use continue, as macro is wrapped in a loop. I regard this as correct goto use */
- STORE_WITH_LOG_AND_FIXUP_RANGE(cp->x, x, cp->type, x_axis, NOOP, goto come_here_if_undefined );
- STORE_WITH_LOG_AND_FIXUP_RANGE(cp->y, y, cp->type, y_axis, NOOP, goto come_here_if_undefined );
- STORE_WITH_LOG_AND_FIXUP_RANGE(cp->z, z, cp->type, z_axis, NOOP, goto come_here_if_undefined );
-
- /* some may complain, but I regard this as the correct use of goto */
- come_here_if_undefined:
- ++xdatum;
- } /* end of whileloop - end of surface */
-
- if (xdatum > 0) {
- this_plot->num_iso_read++; /* Update last iso. */
- this_iso->p_count = xdatum;
-
- this_iso->next = this_plot->iso_crvs;
- this_plot->iso_crvs = this_iso;
-
- if (xdatum != pt_in_iso_crv)
- this_plot->has_grid_topology = FALSE;
-
- } else {
- iso_free(this_iso); /* Free last allocation. */
- }
-
- if (dgrid3d) grid_nongrid_data(this_plot);
- /*}}}*/
- }
-
- if (this_plot->num_iso_read <= 1)
- this_plot->has_grid_topology = FALSE;
- if (this_plot->has_grid_topology && !hidden3d) {
- struct iso_curve *new_icrvs = NULL;
- int num_new_iso = this_plot->iso_crvs->p_count, len_new_iso = this_plot->num_iso_read;
-
- /* Now we need to set the other direction (pseudo) isolines. */
- for (i = 0; i < num_new_iso; i++) {
- struct iso_curve *new_icrv = iso_alloc(len_new_iso);
-
- new_icrv->p_count = len_new_iso;
-
- for (j = 0, this_iso = this_plot->iso_crvs;
- this_iso != NULL;
- j++, this_iso = this_iso->next) {
- /* copy whole point struct to get type too.
- * wasteful for windows, with padding */
- /* more efficient would be extra pointer to same struct */
- new_icrv->points[j]=this_iso->points[i];
- }
-
- new_icrv->next = new_icrvs;
- new_icrvs = new_icrv;
- }
-
- /* Append the new iso curves after the read ones. */
- for (this_iso = this_plot->iso_crvs;
- this_iso->next != NULL;
- this_iso = this_iso->next);
- this_iso->next = new_icrvs;
- }
-
- }
-
-
-
- static void print_3dtable(pcount)
- int pcount;
- {
- register struct surface_points *this_plot;
- int i, curve,surface;
- struct iso_curve *icrvs;
- struct coordinate GPHUGE *points;
-
- for (surface=0, this_plot=first_3dplot ; surface < pcount;
- this_plot=this_plot->next_sp, surface++){
- fprintf(outfile, "\n#Surface %d of %d surfaces\n", surface, pcount);
- icrvs = this_plot->iso_crvs;
- curve = 0;
-
- if (draw_surface) {
- /* only the curves in one direction */
- while(icrvs && curve < this_plot->num_iso_read){
- fprintf(outfile, "\n#IsoCurve %d, %d points\n#x y z type\n", curve, icrvs->p_count);
- for(i=0, points = icrvs->points; i < icrvs->p_count; i++){
- fprintf(outfile, "%g %g %g %c\n",
- points[i].x,
- points[i].y,
- points[i].z,
- points[i].type == INRANGE ? 'i'
- : points[i].type == OUTRANGE ? 'o'
- : 'u');
- }
- icrvs = icrvs->next;
- curve++;
- }
- putc('\n', outfile);
- }
-
- if (draw_contour) {
- int number=0;
- struct gnuplot_contours *c=this_plot->contours;
- while (c) {
- int count=c->num_pts;
- struct coordinate GPHUGE *p=c->coords;
- if (c->isNewLevel)
- /* dont display count - contour split across chunks */
- /* put # in case user wants to use it for a plot */
- /* double blank line to allow plot ... index ... */
- fprintf(outfile, "\n# Contour %d, label:%s\n", number++, c->label);
- for ( ; --count >= 0 ; ++p)
- fprintf(outfile, "%f %f %f\n", p->x, p->y, p->z);
- putc('\n', outfile); /* blank line between segments of same contour */
- c=c->next;
- }
- }
- }
- fflush(outfile);
- }
-
-
-
- #define SET_DUMMY_RANGE(AXIS) \
- do{\
- if (parametric || polar) { \
- t_min = tmin; t_max = tmax;\
- } else if (log_array[AXIS]) {\
- if (min_array[AXIS] <= 0.0 || max_array[AXIS] <= 0.0)\
- int_error("x/x2 range must be greater than 0 for log scale!", NO_CARET);\
- t_min = log(min_array[AXIS])/log_base_array[AXIS]; t_max = log(max_array[AXIS])/log_base_array[AXIS];\
- } else {\
- t_min = min_array[AXIS]; t_max = max_array[AXIS];\
- }\
- t_step = (t_max - t_min) / (samples - 1); \
- }while(0)
-
-
- /*
- * This parses the splot command after any range specifications. To support
- * autoscaling on the x/z axis, we want any data files to define the x/y
- * range, then to plot any functions using that range. We thus parse the
- * input twice, once to pick up the data files, and again to pick up the
- * functions. Definitions are processed twice, but that won't hurt.
- * div - okay, it doesn't hurt, but every time an option as added for
- * datafiles, code to parse it has to be added here. Change so that
- * we store starting-token in the plot structure.
- */
- static void eval_3dplots()
- {
- register int i, j;
- register struct surface_points *this_plot=NULL, **tp_3d_ptr;
- register int start_token, end_token;
- register int begin_token;
- TBOOLEAN some_data_files = FALSE, some_functions=FALSE;
- int plot_num, line_num, point_num, crnt_param = 0; /* 0=z, 1=y, 2=x */
- char *xtitle;
- char *ytitle;
-
- /* Reset first_3dplot. This is usually done at the end of this function.
- If there is an error within this function, the memory is left allocated,
- since we cannot call sp_free if the list is incomplete */
- first_3dplot=NULL;
-
- /* put stuff into arrays to simplify access */
- INIT_ARRAYS(FIRST_X_AXIS, xmin, xmax, autoscale_lx, is_log_x, base_log_x, log_base_log_x, 0);
- INIT_ARRAYS(FIRST_Y_AXIS, ymin, ymax, autoscale_ly, is_log_y, base_log_y, log_base_log_y, 0);
- INIT_ARRAYS(FIRST_Z_AXIS, zmin, zmax, autoscale_lz, is_log_z, base_log_z, log_base_log_z, 1);
-
- x_axis=FIRST_X_AXIS;
- y_axis=FIRST_Y_AXIS;
- z_axis=FIRST_Z_AXIS;
-
- tp_3d_ptr = &(first_3dplot);
- plot_num = 0;
- line_num = 0; /* default line type */
- point_num = 0; /* default point type */
-
- xtitle = NULL;
- ytitle = NULL;
-
- begin_token = c_token;
-
- /*** First Pass: Read through data files ***/
- /*
- * This pass serves to set the x/yranges and to parse the command, as
- * well as filling in every thing except the function data. That is done
- * after the x/yrange is defined.
- */
- while (TRUE) {
- if (END_OF_COMMAND)
- int_error("function to plt3d expected", c_token);
-
- start_token = c_token;
-
- if (is_definition(c_token)) {
- define();
- } else {
- int specs;
- if (isstring(c_token)) { /* data file to plot */
-
- if (parametric && crnt_param != 0)
- int_error("previous parametric function not fully specified",
- c_token);
-
- if (!some_data_files) {
- if (autoscale_lx & 1) {
- min_array[FIRST_X_AXIS] = VERYLARGE;
- }
- if (autoscale_lx & 2) {
- max_array[FIRST_X_AXIS] = -VERYLARGE;
- }
- if (autoscale_ly & 1) {
- min_array[FIRST_Y_AXIS] = VERYLARGE;
- }
- if (autoscale_ly & 2) {
- max_array[FIRST_Y_AXIS] = -VERYLARGE;
- }
- }
- some_data_files = TRUE;
-
- if (*tp_3d_ptr)
- this_plot = *tp_3d_ptr;
- else { /* no memory malloc()'d there yet */
- /* Allocate enough isosamples and samples */
- this_plot = sp_alloc(0, 0, 0, 0);
- *tp_3d_ptr = this_plot;
- }
-
- this_plot->plot_type = DATA3D;
- this_plot->plot_style = data_style;
-
- specs = df_open(3);
- /* parses all datafile-specific modifiers */
- /* we will load the data after parsing title,with,... */
- this_plot->token = end_token = c_token-1; /* for capture to key */
- /* this_plot->token is temporary, for errors in get_3ddata() */
-
- if (datatype[FIRST_X_AXIS]==TIME)
- {
- if (specs<3)
- int_error("Need full using spec for x time data", c_token);
- df_timecol[0]=1;
- }
-
- if (datatype[FIRST_Y_AXIS]==TIME)
- {
- if (specs<3)
- int_error("Need full using spec for y time data", c_token);
- df_timecol[1]=1;
- }
-
- if (datatype[FIRST_Z_AXIS]==TIME)
- {
- if (specs<3)
- df_timecol[0]=1;
- else
- df_timecol[2]=1;
- }
-
-
- } else { /* function to plot */
- ++plot_num;
- if (parametric) /* Rotate between x/y/z axes */
- crnt_param = (crnt_param + 2) % 3; /* +2 same as -1, but beats -ve problem */
- if (*tp_3d_ptr) {
- this_plot = *tp_3d_ptr;
- if (!hidden3d)
- sp_replace(this_plot, samples_1, iso_samples_1,
- samples_2, iso_samples_2);
- else
- sp_replace(this_plot, iso_samples_1, 0,
- 0, iso_samples_2);
- } else { /* no memory malloc()'d there yet */
- /* Allocate enough isosamples and samples */
- if (!hidden3d)
- this_plot = sp_alloc(samples_1, iso_samples_1,
- samples_2, iso_samples_2);
- else
- this_plot = sp_alloc(iso_samples_1, 0,
- 0, iso_samples_2);
- *tp_3d_ptr = this_plot;
- }
-
- this_plot->plot_type = FUNC3D;
- this_plot->has_grid_topology = TRUE;
- this_plot->plot_style = func_style;
- this_plot->num_iso_read = iso_samples_2;
- dummy_func = &plot_func;
- plot_func.at = temp_at();
- dummy_func=NULL;
- /* ignore it for now */
- some_functions=TRUE;
- end_token = c_token - 1;
- } /* end of IS THIS A FILE OR A FUNC block */
-
- if (this_plot->title) {
- free(this_plot->title);
- this_plot->title=NULL;
- }
-
-
- if (almost_equals(c_token, "t$itle")) {
- if (!isstring(++c_token))
- int_error("Expected title", c_token);
- m_quote_capture(&(this_plot->title), c_token, c_token);
- ++c_token;
- } else if (almost_equals(c_token,"not$itle")) {
- this_plot->title=NULL;
- ++c_token;
- } else {
- m_capture(&(this_plot->title), start_token, end_token);
- }
-
- this_plot->line_type = line_num;
- this_plot->point_type = point_num;
-
- if (almost_equals(c_token, "w$ith")) {
- this_plot->plot_style = get_style();
- }
- if (!equals(c_token, ",") && !END_OF_COMMAND) {
- struct value t;
- this_plot->line_type = (int) real(const_express(&t)) - 1;
- }
- if (!equals(c_token, ",") && !END_OF_COMMAND) {
- struct value t;
- this_plot->point_type = (int) real(const_express(&t)) - 1;
- }
-
-
- if ((this_plot->plot_style == POINTSTYLE) ||
- (this_plot->plot_style == LINESPOINTS) ||
- (this_plot->plot_style == YERRORBARS) ||
- (this_plot->plot_style == XERRORBARS) ||
- (this_plot->plot_style == XYERRORBARS) ||
- (this_plot->plot_style == BOXXYERROR))
- if (crnt_param == 0)
- point_num +=
- 1 + (draw_contour != 0)
- + (hidden3d != 0);
- if (crnt_param == 0)
- line_num += 1 + (draw_contour != 0)
- + (hidden3d != 0);
- }
-
-
- /* now get the data... having to think hard here...
- * first time through, we fill in this_plot. For second
- * surface in file, we have to allocate another surface
- * struct. BUT we may allocate this store only to
- * find that it is merely some blank lines at end of file
- * tp_3d_ptr is still pointing at next field of prev. plot,
- * before : prev_or_first -> this_plot -> possible_preallocated_store
- * tp_3d_ptr--^
- * after : prev_or_first -> first -> second -> last -> possibly_more_store
- * tp_3d_ptr ----^
- * if file is empty, tp_3d_ptr is not moved. this_plot continues
- * to point at allocated storage, but that will be reused later
- */
-
- assert(this_plot == *tp_3d_ptr);
-
- if (this_plot->plot_type == DATA3D) {
- /* remember settings for second surface in file */
- int this_line=this_plot->line_type;
- int this_point=this_plot->point_type;
- int this_style=this_plot->plot_style;
- int this_token=this_plot->token;
- while (!df_eof)
- {
- this_plot = *tp_3d_ptr;
- assert(this_plot != NULL);
-
- /* dont move tp_3d_ptr until we are sure we
- * have read a surface
- */
- this_plot->token=this_token; /* used by get_3ddata() */
- get_3ddata(this_plot);
- this_plot->token=c_token; /* for second pass */
-
- if (this_plot->num_iso_read==0)
- /* probably df_eof, in which case we
- * will leave loop. if not eof, then
- * how come we got no surface ? - retry
- * in neither case do we update tp_3d_ptr
- */
- continue;
-
- /* okay, we have read a surface */
- ++plot_num;
- tp_3d_ptr = &(this_plot->next_sp);
- if (df_eof)
- break;
-
- /* there might be another surface */
- if ( (this_plot=*tp_3d_ptr) != NULL ) {
- if (this_plot->title) {
- free(this_plot->title);
- this_plot->title = NULL;
- }
- } else {
- /* Allocate enough isosamples and samples */
- this_plot = *tp_3d_ptr = sp_alloc(0, 0, 0, 0);
- }
- this_plot->plot_type=DATA3D;
- this_plot->line_type=this_line;
- this_plot->point_type=this_point;
- this_plot->plot_style=this_style;
- }
- df_close();
- } else { /* not a data file */
- tp_3d_ptr = &(this_plot->next_sp);
- this_plot->token = c_token; /* store for second pass */
- }
-
- /* DO NOT USE this_plot AFTER HERE - it may point at an unused data plot */
-
- if (equals(c_token, ","))
- c_token++;
- else
- break;
- }
-
- if (parametric && crnt_param != 0)
- int_error("parametric function not fully specified", NO_CARET);
-
-
- /*** Second Pass: Evaluate the functions ***/
- /*
- * Everything is defined now, except the function data. We expect no
- * syntax errors, etc, since the above parsed it all. This makes the code
- * below simpler. If autoscale_ly, the yrange may still change.
- * - eh ? - z can still change. x/y/z can change if we are parametric ??
- */
-
- if (some_functions) {
-
- /* I've changed the controlled variable in fn plots to u_min etc since
- *it's easier for me to think parametric - 'normal' plot is after all
- * a special case. I was confused about x_min being both minimum of
- * x values found, and starting value for fn plots.
- */
- register double u_min, u_max, u_step, v_min, v_max, v_step;
- double uisodiff, visodiff;
-
- if (!parametric) {
-
- /* give error if xrange badly set from missing datafile error
- * parametric fn can still set ranges
- * if there are no fns, we'll report it later as 'nothing to plot'
- */
-
- if (min_array[FIRST_X_AXIS] == VERYLARGE || max_array[FIRST_X_AXIS] == -VERYLARGE) {
- int_error("x range is invalid", c_token);
- }
- if (min_array[FIRST_Y_AXIS] == VERYLARGE || max_array[FIRST_Y_AXIS] == -VERYLARGE) {
- int_error("y range is invalid", c_token);
- }
-
- /* check that xmin -> xmax is not too small */
- FIXUP_RANGE(FIRST_X_AXIS, x);
- FIXUP_RANGE(FIRST_Y_AXIS, y);
- }
-
- if (parametric && !some_data_files) {
- /* parametric fn can still change x/y range */
- if (autoscale_lx & 1)
- min_array[FIRST_X_AXIS] = VERYLARGE;
- if (autoscale_lx & 2)
- max_array[FIRST_X_AXIS] = -VERYLARGE;
- if (autoscale_ly & 1)
- min_array[FIRST_Y_AXIS] = VERYLARGE;
- if (autoscale_ly & 2)
- max_array[FIRST_Y_AXIS] = -VERYLARGE;
- }
-
-
- if (parametric) {
- u_min=umin;
- u_max=umax;
- v_min=vmin;
- v_max=vmax;
- } else {
- if (is_log_x) {
- if (min_array[FIRST_X_AXIS] <= 0.0 || max_array[FIRST_X_AXIS] <= 0.0)
- int_error("x range must be greater than 0 for log scale!", NO_CARET);
- u_min = log(min_array[FIRST_X_AXIS])/log_base_log_x;
- u_max = log(max_array[FIRST_X_AXIS])/log_base_log_x;
- } else {
- u_min = min_array[FIRST_X_AXIS];
- u_max = max_array[FIRST_X_AXIS];
- }
-
- if (is_log_y) {
- if (min_array[FIRST_Y_AXIS] <= 0.0 || max_array[FIRST_Y_AXIS] <= 0.0)
- int_error("y range must be greater than 0 for log scale!", NO_CARET);
- v_min = log(min_array[FIRST_Y_AXIS])/log_base_log_y;
- v_max = log(max_array[FIRST_Y_AXIS])/log_base_log_y;
- } else {
- v_min = min_array[FIRST_Y_AXIS];
- v_max = max_array[FIRST_Y_AXIS];
- }
- }
-
-
- if (samples_1 < 2 || samples_2 < 2 || iso_samples_1 < 2 || iso_samples_2 < 2)
- int_error("samples or iso_samples < 2. Must be at least 2.", NO_CARET);
-
- if (this_plot && this_plot->has_grid_topology && hidden3d) {
- u_step = (u_max - u_min) / (iso_samples_1 - 1);
- v_step = (v_max - v_min) / (iso_samples_2 - 1);
- } else {
- u_step = (u_max - u_min) / (samples_1 - 1);
- v_step = (v_max - v_min) / (samples_2 - 1);
- }
- uisodiff = (u_max - u_min) / (iso_samples_1 - 1);
- visodiff = (v_max - v_min) / (iso_samples_2 - 1);
-
- this_plot = first_3dplot;
- c_token = begin_token; /* start over */
-
- /* Read through functions */
- while (TRUE) {
- if (is_definition(c_token)) {
- define();
- } else {
- if (!isstring(c_token)) { /* func to plot */
- struct iso_curve *this_iso = this_plot->iso_crvs;
- struct coordinate GPHUGE *points = this_iso->points;
- int num_sam_to_use, num_iso_to_use;
-
- if (parametric)
- crnt_param = (crnt_param + 2) % 3;
- dummy_func = &plot_func;
- plot_func.at = temp_at(); /* reparse function */
- dummy_func=NULL;
- num_iso_to_use = iso_samples_2;
- if (!(this_plot->has_grid_topology && hidden3d))
- num_sam_to_use = samples_1;
- else
- num_sam_to_use = iso_samples_1;
-
- for (j = 0; j < num_iso_to_use; j++) {
- double y = v_min + j * visodiff;
- /* if (is_log_y) PEM fix logscale y axis */
- /* y = pow(log_base_log_y,y); 26-Sep-89 */
- /* parametric => NOT a log quantity (?) */
- (void) Gcomplex(&plot_func.dummy_values[1],
- !parametric && is_log_y ? pow(base_log_y, y) : y,
- 0.0);
-
- for (i = 0; i < num_sam_to_use; i++) {
- double x = u_min + i * u_step;
- struct value a;
- double temp;
-
- /* if (is_log_x) PEM fix logscale x axis */
- /* x = pow(base_log_x,x); 26-Sep-89 */
- /* parametric => NOT a log quantity (?) */
- (void) Gcomplex(&plot_func.dummy_values[0],
- !parametric && is_log_x ? pow(base_log_x, x) : x,
- 0.0);
-
- points[i].x = x;
- points[i].y = y;
-
- evaluate_at(plot_func.at, &a);
-
- if (undefined || (fabs(imag(&a)) > zero)) {
- points[i].type = UNDEFINED;
- continue;
- }
- temp = real(&a);
-
- points[i].type=INRANGE;
- STORE_WITH_LOG_AND_FIXUP_RANGE(points[i].z, temp, points[i].type,
- crnt_param, NOOP, NOOP);
-
- }
- this_iso->p_count = num_sam_to_use;
- this_iso = this_iso->next;
- points = this_iso? this_iso->points: NULL;
- }
-
- if (!(this_plot->has_grid_topology && hidden3d)) {
- num_iso_to_use = iso_samples_1;
- num_sam_to_use = samples_2;
- for (i = 0; i < num_iso_to_use; i++) {
- double x = u_min + i * uisodiff;
- /* if (is_log_x) PEM fix logscale x axis */
- /* x = pow(base_log_x,x); 26-Sep-89 */
- /* if parametric, no logs involved - 3.6 */
- (void) Gcomplex(&plot_func.dummy_values[0],
- (!parametric && is_log_x) ? pow(base_log_x, x) : x,
- 0.0);
-
- for (j = 0; j < num_sam_to_use; j++) {
- double y = v_min + j * v_step;
- struct value a;
- double temp;
- /* if (is_log_y) PEM fix logscale y axis */
- /* y = pow(base_log_y,y); 26-Sep-89 */
- (void) Gcomplex(&plot_func.dummy_values[1],
- (!parametric && is_log_y) ? pow(base_log_y, y) : y,
- 0.0);
-
- points[j].x = x;
- points[j].y = y;
-
- evaluate_at(plot_func.at, &a);
-
- if (undefined || (fabs(imag(&a)) > zero)) {
- points[j].type = UNDEFINED;
- continue;
- }
- temp = real(&a);
-
- points[j].type=INRANGE;
- STORE_WITH_LOG_AND_FIXUP_RANGE(points[j].z, temp, points[j].type,
- crnt_param, NOOP, NOOP);
- }
- this_iso->p_count = num_sam_to_use;
- this_iso = this_iso->next;
- points = this_iso ? this_iso->points : NULL;
- }
- }
- } /* end of ITS A FUNCTION TO PLOT */
- c_token = this_plot->token; /* we saved it from first pass */
-
- do
- this_plot = this_plot->next_sp;
- while (this_plot && this_plot->token == c_token); /* one data file can make several plots */
- }
-
- if (equals(c_token, ","))
- c_token++;
- else
- break;
- }
-
- if (parametric) {
- /* Now actually fix the plot triplets to be single plots. */
- parametric_3dfixup(first_3dplot, &plot_num);
-
- FIXUP_RANGE(FIRST_X_AXIS, x);
- FIXUP_RANGE(FIRST_Y_AXIS, y);
- }
-
- } /* some functions */
-
-
- /* if first_3dplot is NULL, we have no functions or data at all. This can
- happen, if you type "splot x=5", since x=5 is a variable assignment */
-
- if(plot_num == 0 || first_3dplot==NULL) {
- int_error("no functions or data to plot", c_token);
- }
-
- if (min_array[FIRST_X_AXIS] == VERYLARGE ||
- max_array[FIRST_X_AXIS] == -VERYLARGE ||
- min_array[FIRST_Y_AXIS] == VERYLARGE ||
- max_array[FIRST_Y_AXIS] == -VERYLARGE ||
- min_array[FIRST_Z_AXIS] == VERYLARGE ||
- max_array[FIRST_Z_AXIS] == -VERYLARGE)
- int_error("All points undefined", NO_CARET);
-
- FIXUP_RANGE(FIRST_Z_AXIS, z);
-
- FIXUP_RANGE_FOR_LOG(FIRST_X_AXIS, x);
- FIXUP_RANGE_FOR_LOG(FIRST_Y_AXIS, y);
- FIXUP_RANGE_FOR_LOG(FIRST_Z_AXIS, z);
-
- /* last parameter should take plot size into effect...
- * probably needs to be moved to graph3d.c
- * in the meantime, a value of 20 gives same behaviour
- * as 3.5 which will do for the moment
- */
-
- if (xtics) setup_tics(FIRST_X_AXIS, &xticdef, xformat, 20);
- if (ytics) setup_tics(FIRST_Y_AXIS, &yticdef, yformat, 20);
- if (ztics) setup_tics(FIRST_Z_AXIS, &zticdef, zformat, 20);
-
- #define WRITEBACK(axis,min,max) \
- if(range_flags[axis]&RANGE_WRITEBACK) \
- {if (auto_array[axis]&1) min=min_array[axis]; \
- if (auto_array[axis]&2) max=max_array[axis]; \
- }
-
- WRITEBACK(FIRST_X_AXIS,xmin,xmax)
- WRITEBACK(FIRST_Y_AXIS,ymin,ymax)
- WRITEBACK(FIRST_Z_AXIS,zmin,zmax)
-
- if (plot_token != -1) {
- /* note that m_capture also frees the old replot_line */
- m_capture(&replot_line, plot_token, c_token);
- plot_token = -1;
- }
-
- if(plot_num==0 || first_3dplot==NULL) {
- int_error("no functions or data to plot", c_token);
- }
-
- /* Creates contours if contours are to be plotted as well. */
- if (draw_contour) {
- for (this_plot = first_3dplot, i = 0;
- i < plot_num;
- this_plot = this_plot->next_sp, i++) {
- if (this_plot->contours) {
- struct gnuplot_contours *cntr, *cntrs = this_plot->contours;
-
- while (cntrs) {
- cntr = cntrs;
- cntrs = cntrs->next;
- free(cntr->coords);
- free(cntr);
- }
- }
- /* Make sure this one can be contoured. */
- if (!this_plot->has_grid_topology) {
- this_plot->contours = NULL;
- fprintf(stderr,"Notice: cannot contour non grid data!\n");
- /* changed from int_error by recommendation of rkc@xn.ll.mit.edu */
- }
- else if (this_plot->plot_type == DATA3D)
- this_plot->contours = contour(
- this_plot->num_iso_read,
- this_plot->iso_crvs,
- contour_levels, contour_pts,
- contour_kind, contour_order,
- levels_kind, levels_list);
- else
- this_plot->contours = contour(iso_samples_2,
- this_plot->iso_crvs,
- contour_levels, contour_pts,
- contour_kind, contour_order,
- levels_kind, levels_list);
- }
- }
- if (strcmp(term->name, "table") == 0)
- print_3dtable(plot_num);
- else
- do_3dplot(first_3dplot, plot_num);
- sp_free(first_3dplot);
- first_3dplot = NULL;
- }
-
- static void
- parametric_3dfixup(start_plot, plot_num)
- struct surface_points *start_plot;
- int *plot_num;
- /*
- * The hardest part of this routine is collapsing the FUNC plot types in the
- * list (which are gauranteed to occur in (x,y,z) triplets while preserving
- * the non-FUNC type plots intact. This means we have to work our way
- * through various lists. Examples (hand checked):
- * start_plot:F1->F2->F3->NULL ==> F3->NULL
- * start_plot:F1->F2->F3->F4->F5->F6->NULL ==> F3->F6->NULL
- * start_plot:F1->F2->F3->D1->D2->F4->F5->F6->D3->NULL ==>
- * F3->D1->D2->F6->D3->NULL
- */
- {
- /*
- * I initialized *free_list with NULL, because my compiler warns some lines
- * later that it might be uninited. The code however seems to not access that
- * line in that case, but if I'm right, my change is OK and if not, this is a
- * serious bug in the code.
- *
- * x and y ranges now fixed in eval_3dplots
- */
- struct surface_points *xp, *new_list, *free_list = NULL;
- struct surface_points **last_pointer=&new_list;
-
- int i, tlen, surface;
- char *new_title;
-
- /*
- * Ok, go through all the plots and move FUNC3D types together. Note:
- * this originally was written to look for a NULL next pointer, but
- * gnuplot wants to be sticky in grabbing memory and the right number of
- * items in the plot list is controlled by the plot_num variable.
- *
- * Since gnuplot wants to do this sticky business, a free_list of
- * surface_points is kept and then tagged onto the end of the plot list
- * as this seems more in the spirit of the original memory behavior than
- * simply freeing the memory. I'm personally not convinced this sort of
- * concern is worth it since the time spent computing points seems to
- * dominate any garbage collecting that might be saved here...
- */
- new_list = xp = start_plot;
- for (surface = 0; surface < *plot_num; surface++) {
- if (xp->plot_type == FUNC3D) {
- struct surface_points *yp = xp->next_sp;
- struct surface_points *zp = yp->next_sp;
-
- /* Here's a FUNC3D parametric function defined as three parts.
- * Go through all the points and assign the x's and y's from xp and
- * yp to zp. min/max already done
- */
- struct iso_curve *xicrvs = xp->iso_crvs;
- struct iso_curve *yicrvs = yp->iso_crvs;
- struct iso_curve *zicrvs = zp->iso_crvs;
-
- (*plot_num) -= 2;
-
- assert(INRANGE < OUTRANGE && OUTRANGE < UNDEFINED);
-
- while (zicrvs) {
- struct coordinate GPHUGE *xpoints = xicrvs->points, GPHUGE *ypoints = yicrvs->points, GPHUGE *zpoints = zicrvs->points;
- for (i = 0; i < zicrvs->p_count; ++i) {
- zpoints[i].x = xpoints[i].z;
- zpoints[i].y = ypoints[i].z;
- if (zpoints[i].type < xpoints[i].type) zpoints[i].type = xpoints[i].type;
- if (zpoints[i].type < ypoints[i].type) zpoints[i].type = ypoints[i].type;
-
- }
- xicrvs = xicrvs->next;
- yicrvs = yicrvs->next;
- zicrvs = zicrvs->next;
- }
-
- /* Ok, fix up the title to include xp and yp plots. */
- if ((xp->title && xp->title[0] != '\0') ||
- (yp->title && yp->title[0] != '\0')) {
- tlen = (xp->title ? strlen(xp->title) : 0) +
- (yp->title ? strlen(yp->title) : 0) +
- (zp->title ? strlen(zp->title) : 0) + 5;
- new_title = alloc((unsigned long) tlen, "string");
- new_title[0] = 0;
- if (xp->title) {
- strcat(new_title, xp->title);
- strcat(new_title, ", "); /* + 2 */
- }
- if (yp->title) {
- strcat(new_title, yp->title);
- strcat(new_title, ", "); /* + 2 */
- }
- if (zp->title) {
- strcat(new_title, zp->title);
- }
- free(zp->title);
- zp->title = new_title;
- }
-
- /* add xp and yp to head of free list */
- assert(xp->next_sp == yp);
- yp->next_sp = free_list;
- free_list = xp;
-
- /* add zp to tail of new_list */
- *last_pointer = zp;
- last_pointer = &(zp->next_sp);
- xp=zp->next_sp;
- } else { /* its a data plot */
- assert(*last_pointer == xp); /* think this is true ! */
- last_pointer = &(xp->next_sp);
- xp=xp->next_sp;
- }
- }
-
- /* Ok, append free list and write first_plot */
- *last_pointer = free_list;
- first_3dplot=new_list;
- }
-