gnuplot-old/src/plot2d.c at 8d534a91c3459d1e57d053e425f42e8e701bd09a · gnuplot/gnuplot-old · GitHub

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#ifndef lint

static char *RCSid = "$Id: plot2d.c,v 1.6 1999/06/02 17:07:35 lhecking Exp $";

#endif

/* GNUPLOT - plot2d.c */

/*[

* 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 complete modified source code. Modifications are to

* be distributed as patches to the released version. Permission to

* distribute binaries produced by compiling modified sources is granted,

* provided you

* 1. distribute the corresponding source modifications from the

* released version in the form of a patch file along with the binaries,

* 2. add special version identification to distinguish your version

* in addition to the base release version number,

* 3. provide your name and address as the primary contact for the

* support of your modified version, and

* 4. retain our contact information in regard to use of the base

* software.

* Permission to distribute the released version of the source code along

* with corresponding source modifications in the form of a patch file is

* granted with same provisions 2 through 4 for binary distributions.

* This software is provided "as is" without express or implied warranty

* to the extent permitted by applicable law.

]*/

#include "plot.h"

#include "setshow.h"

#include "fit.h"

#include "binary.h"

#ifndef _Windows

# include "help.h"

#endif

#ifndef STDOUT

#define STDOUT 1

#endif

/* static prototypes */

void plotrequest __PROTO((void));

void plot3drequest __PROTO((void));

void define __PROTO((void));

static int get_data __PROTO((struct curve_points * this_plot));

static void store2d_point __PROTO((struct curve_points * this_plot, int i, double x, double y, double xlow, double xhigh, double ylow, double yhigh, double width));

static void print_table __PROTO((struct curve_points * first_plot, int plot_num));

static void eval_plots __PROTO((void));

static void parametric_fixup __PROTO((struct curve_points * start_plot, int *plot_num));

/* the curves/surfaces of the plot */

struct curve_points *first_plot = NULL;

static struct udft_entry plot_func;

extern struct udft_entry *dummy_func;

/* jev -- for passing data thru user-defined function */

/* Needed by datafile.c */

struct udft_entry ydata_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.

* Elements are z = 0, y1 = 1, x1 = 2, [z2 =4 ], y2 = 5, x2 = 6

* these are given symbolic names in plot.h

/* Were declared in command.c */

double min_array[AXIS_ARRAY_SIZE], max_array[AXIS_ARRAY_SIZE];

int auto_array[AXIS_ARRAY_SIZE];

TBOOLEAN log_array[AXIS_ARRAY_SIZE];

double base_array[AXIS_ARRAY_SIZE];

double log_base_array[AXIS_ARRAY_SIZE];

/* Deleted from setshow.h and renamed */

extern FILE *gpoutfile;

/* if user specifies [10:-10] we use [-10:10] internally, and swap at end */

int reverse_range[AXIS_ARRAY_SIZE];

/* 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;

#define Inc_c_token if (++c_token >= num_tokens) \

int_error (c_token, "Syntax error");

* 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{auto_array[axis] = auto; \

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(c_token, "']' expected");\

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 range and take logs of min and max if logscale

* this also restores min and max for ranges like [10:-10]

#ifdef HAVE_STRINGIZE

# define LOG_MSG(x) #x " range must be greater than 0 for log scale!"

#else

# define LOG_MSG(x) "x range must be greater than 0 for log scale!"

#endif

#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(NO_CARET, LOG_MSG(WHICH)); \

min_array[AXIS] = log(min_array[AXIS])/log_base_array[AXIS]; \

max_array[AXIS] = log(max_array[AXIS])/log_base_array[AXIS]; \

} \

} while(0)

void plotrequest()

* In the parametric case we can say plot [a= -4:4] [-2:2] [-1:1] sin(a),a**2

* while in the non-parametric case we would say only plot [b= -2:2] [-1:1]

* sin(b)

{

int dummy_token = -1;

if (!term) /* unknown */

int_error(c_token, "use 'set term' to set terminal type first");

is_3d_plot = FALSE;

if (parametric && strcmp(dummy_var[0], "u") == 0)

strcpy(dummy_var[0], "t");

/* initialise the arrays from the 'set' scalars */

INIT_ARRAYS(FIRST_X_AXIS, xmin, xmax, autoscale_x, is_log_x, base_log_x, log_base_log_x, 0);

INIT_ARRAYS(FIRST_Y_AXIS, ymin, ymax, autoscale_y, is_log_y, base_log_y, log_base_log_y, 1);

INIT_ARRAYS(SECOND_X_AXIS, x2min, x2max, autoscale_x2, is_log_x2, base_log_x2, log_base_log_x2, 0);

INIT_ARRAYS(SECOND_Y_AXIS, y2min, y2max, autoscale_y2, is_log_y2, base_log_y2, log_base_log_y2, 1);

min_array[T_AXIS] = tmin;

max_array[T_AXIS] = tmax;

if (equals(c_token, "[")) {

c_token++;

if (isletter(c_token)) {

if (equals(c_token + 1, "=")) {

dummy_token = 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); */

}

} {

int axis = (parametric || polar) ? T_AXIS : FIRST_X_AXIS;

auto_array[axis] = load_range(axis, &min_array[axis], &max_array[axis], auto_array[axis]);

if (!equals(c_token, "]"))

int_error(c_token, "']' expected");

c_token++;

} /* end of scope of 'axis' */

} /* first '[' */

if (parametric || polar) /* set optional x ranges */

LOAD_RANGE(FIRST_X_AXIS);

else {

/* order of t doesn't matter, but x does */

CHECK_REVERSE(FIRST_X_AXIS);

}

LOAD_RANGE(FIRST_Y_AXIS);

CHECK_REVERSE(FIRST_Y_AXIS);

LOAD_RANGE(SECOND_X_AXIS);

CHECK_REVERSE(SECOND_X_AXIS);

LOAD_RANGE(SECOND_Y_AXIS);

CHECK_REVERSE(SECOND_Y_AXIS);

/* use the default dummy variable unless changed */

if (dummy_token >= 0)

copy_str(c_dummy_var[0], dummy_token, MAX_ID_LEN);

else

(void) strcpy(c_dummy_var[0], dummy_var[0]);

eval_plots();

}

/* Use up to 7 columns in data file at once -- originally it was 5 */

#define NCOL 7

/* A quick note about boxes style. For boxwidth auto, we cannot

* calculate widths yet, since it may be sorted, etc. But if

* width is set, we must do it now, before logs of xmin/xmax

* are taken.

* We store -1 in point->z as a marker to mean width needs to be

* calculated, or 0 to mean that xmin/xmax are set correctly

static int get_data(this_plot)

struct curve_points *this_plot;

/* this_plot->token is after datafile spec, for error reporting

* it will later be moved passed title/with/linetype/pointtype

{

double v[NCOL];

int storetoken = this_plot->token;

/* eval_plots has already opened file */

switch (this_plot->plot_style) { /* set maximum columns to scan */

case XYERRORLINES:

case XYERRORBARS:

case BOXXYERROR:

col = 7;

break;

case BOXERROR:

case FINANCEBARS:

case CANDLESTICKS:

col = 5;

break;

case XERRORLINES:

case YERRORLINES:

case XERRORBARS:

case YERRORBARS:

case VECTOR:

col = 4;

break;

case BOXES:

col = 4;

break;

default:

col = 2;

}

if (this_plot->plot_smooth == ACSPLINES)

col = 3;

if (df_no_use_specs > col)

fputs("warning : too many using specs for this style\n", stderr);

i = 0;

while ((j = df_readline(v, col)) != DF_EOF) {

/* j <= col */

if (i >= this_plot->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.

cp_extend(this_plot, i + (i < 1000 ? i : 1000));

}

/* Limitation: No xerrorbars with boxes */

switch (j) {

default:

{

df_close();

int_error(c_token, "internal error : df_readline returned %d : datafile line %d", j, df_line_number);

}

case DF_UNDEFINED:

/* bad result from extended using expression */

this_plot->points[i].type = UNDEFINED;

i++;

continue;

case DF_FIRST_BLANK:

/* break in data, make next point undefined */

this_plot->points[i].type = UNDEFINED;

i++;

continue;

case DF_SECOND_BLANK:

/* second blank line. We dont do anything

* (we did everything when we got FIRST one)

continue;

case 0: /* not blank line, but df_readline couldn't parse it */

{

df_close();

int_error(this_plot->token,

"Bad data on line %d", df_line_number);

}

case 1:

{ /* only one number */

/* x is index, assign number to y */

v[1] = v[0];

v[0] = df_datum;

/* nobreak */

}

case 2:

/* x, y */

/* ylow and yhigh are same as y */

if (this_plot->plot_style == BOXES && boxwidth > 0) {

/* calc width now */

store2d_point(this_plot, i++, v[0], v[1], v[0] - boxwidth / 2, v[0] + boxwidth / 2, v[1], v[1], 0.0);

} else {

/* xlow and xhigh are same as x */

store2d_point(this_plot, i++, v[0], v[1], v[0], v[0], v[1], v[1],

-1.0); /* auto width if boxes, else ignored */

}

break;

case 3:

/* x, y, ydelta OR x, y, xdelta OR x, y, width */

if (this_plot->plot_smooth == ACSPLINES)

store2d_point(this_plot, i++, v[0], v[1], v[0], v[0], v[1], v[1], v[2]);

else

switch (this_plot->plot_style) {

default:

int_warn(storetoken, "This plot style not work with 3 cols. Setting to yerrorbars");

this_plot->plot_style = YERRORBARS;

/* fall through */

case YERRORLINES:

case YERRORBARS:

case BOXERROR: /* x, y, dy */

store2d_point(this_plot, i++, v[0], v[1], v[0], v[0], v[1] - v[2], v[1] + v[2],

-1.0); /* auto width if boxes, else ignored */

break;

case XERRORLINES:

case XERRORBARS:

store2d_point(this_plot, i++, v[0], v[1], v[0] - v[2], v[0] + v[2], v[1], v[1], 0.0);

break;

case BOXES:

/* calculate xmin and xmax here, so that logs are taken if

* if necessary

store2d_point(this_plot, i++, v[0], v[1], v[0] - v[2] / 2, v[0] + v[2] / 2, v[1], v[1], 0.0);

break;

} /*inner switch */

break;

case 4:

/* x, y, ylow, yhigh OR

* x, y, xlow, xhigh OR

* x, y, xdelta, ydelta OR

* x, y, ydelta, width

switch (this_plot->plot_style) {

default:

int_warn(storetoken, "This plot style does not work with 4 cols. Setting to yerrorbars");

this_plot->plot_style = YERRORBARS;

/* fall through */

case YERRORLINES:

case YERRORBARS:

store2d_point(this_plot, i++, v[0], v[1], v[0], v[0], v[2], v[3], -1.0);

break;

case BOXXYERROR: /* x, y, dx, dy */

case XYERRORLINES:

case XYERRORBARS:

store2d_point(this_plot, i++, v[0], v[1], v[0] - v[2], v[0] + v[2], v[1] - v[3], v[1] + v[3], 0.0);

break;

case BOXES: /* x, y, xmin, xmax */

store2d_point(this_plot, i++, v[0], v[1], v[2], v[3], v[1], v[1], 0.0);

break;

case XERRORLINES:

case XERRORBARS:

store2d_point(this_plot, i++, v[0], v[1], v[2], v[3], v[1], v[1], 0.0);

break;

case BOXERROR:

/* x,y, xleft, xright */

store2d_point(this_plot, i++, v[0], v[1], v[0], v[0], v[1] - v[2], v[1] + v[2], 0.0);

break;

case VECTOR:

/* x,y,dx,dy */

store2d_point(this_plot, i++, v[0], v[1], v[0], v[0] + v[2], v[1], v[1] + v[3], -1.0);

break;

} /*inner switch */

break;

case 5:

{ /* x, y, ylow, yhigh, width or x open low high close */

switch (this_plot->plot_style) {

default:

int_warn(storetoken, "Five col. plot style must be boxerrorbars, financebars or candlesticks. Setting to boxerrorbars");

this_plot->plot_style = BOXERROR;

/*fall through */

case BOXERROR: /* x, y, ylow, yhigh, width */

store2d_point(this_plot, i++, v[0], v[1], v[0] - v[4] / 2, v[0] + v[4] / 2, v[2], v[3], 0.0);

break;

case FINANCEBARS:

case CANDLESTICKS:

store2d_point(this_plot, i++, v[0], v[1], v[0], v[0], v[2], v[3], v[4]);

break;

}

break;

}

case 7:

/* same as six columns. Width ignored */

/* eh ? - fall through */

case 6:

/* x, y, xlow, xhigh, ylow, yhigh */

switch (this_plot->plot_style) {

default:

int_warn(storetoken, "This plot style not work with 6 cols. Setting to xyerrorbars");

this_plot->plot_style = XYERRORBARS;

/*fall through */

case XYERRORLINES:

case XYERRORBARS:

case BOXXYERROR:

store2d_point(this_plot, i++, v[0], v[1], v[2], v[3], v[4], v[5], 0.0);

break;

}

} /*switch */

} /*while */

this_plot->p_count = i;

cp_extend(this_plot, i); /* shrink to fit */

df_close();

return i; /* i==0 indicates an 'empty' file */

}

/* called by get_data for each point */

static void store2d_point(this_plot, i, x, y, xlow, xhigh, ylow, yhigh, width)

struct curve_points *this_plot;

int i; /* point number */

double x, y;

double ylow, yhigh;

double xlow, xhigh;

double width; /* -1 means autocalc, 0 means use xmin/xmax */

{

struct coordinate GPHUGE *cp = &(this_plot->points[i]);

int dummy_type = INRANGE; /* sometimes we dont care about outranging */

/* jev -- pass data values thru user-defined function */

/* div -- y is dummy variable 2 - copy value there */

if (ydata_func.at) {

struct value val;

(void) Gcomplex(&ydata_func.dummy_values[0], y, 0.0);

ydata_func.dummy_values[2] = ydata_func.dummy_values[0];

evaluate_at(ydata_func.at, &val);

y = undefined ? 0.0 : real(&val);

(void) Gcomplex(&ydata_func.dummy_values[0], ylow, 0.0);

ydata_func.dummy_values[2] = ydata_func.dummy_values[0];

evaluate_at(ydata_func.at, &val);

ylow = undefined ? 0 : real(&val);

(void) Gcomplex(&ydata_func.dummy_values[0], yhigh, 0.0);

ydata_func.dummy_values[2] = ydata_func.dummy_values[0];

evaluate_at(ydata_func.at, &val);

yhigh = undefined ? 0 : real(&val);

}

dummy_type = cp->type = INRANGE;

if (polar) {

double newx, newy;

if (!(autoscale_r & 2) && y > rmax) {

cp->type = OUTRANGE;

}

if (!(autoscale_r & 1)) {

/* we store internally as if plotting r(t)-rmin */

y -= rmin;

}

newx = y * cos(x * ang2rad);

newy = y * sin(x * ang2rad);

#if 0 /* HBB 981118: added polar errorbars */

/* only lines and points supported with polar */

y = ylow = yhigh = newy;

x = xlow = xhigh = newx;

#else

y = newy;

x = newx;

if (!(autoscale_r & 2) && yhigh > rmax) {

cp->type = OUTRANGE;

}

if (!(autoscale_r & 1)) {

/* we store internally as if plotting r(t)-rmin */

yhigh -= rmin;

}

newx = yhigh * cos(xhigh * ang2rad);

newy = yhigh * sin(xhigh * ang2rad);

yhigh = newy;

xhigh = newx;

if (!(autoscale_r & 2) && ylow > rmax) {

cp->type = OUTRANGE;

}

if (!(autoscale_r & 1)) {

/* we store internally as if plotting r(t)-rmin */

ylow -= rmin;

}

newx = ylow * cos(xlow * ang2rad);

newy = ylow * sin(xlow * ang2rad);

ylow = newy;

xlow = newx;

#endif

}

/* return immediately if x or y are undefined

* we dont care if outrange for high/low.

* BUT if high/low undefined (ie log( < 0 ), no number is stored,

* but graphics.c doesn't know.

* explicitly store -VERYLARGE;

STORE_WITH_LOG_AND_FIXUP_RANGE(cp->x, x, cp->type, this_plot->x_axis, NOOP, return);

STORE_WITH_LOG_AND_FIXUP_RANGE(cp->xlow, xlow, dummy_type, this_plot->x_axis, NOOP, cp->xlow = -VERYLARGE);

STORE_WITH_LOG_AND_FIXUP_RANGE(cp->xhigh, xhigh, dummy_type, this_plot->x_axis, NOOP, cp->xhigh = -VERYLARGE);

STORE_WITH_LOG_AND_FIXUP_RANGE(cp->y, y, cp->type, this_plot->y_axis, NOOP, return);

STORE_WITH_LOG_AND_FIXUP_RANGE(cp->ylow, ylow, dummy_type, this_plot->y_axis, NOOP, cp->ylow = -VERYLARGE);

STORE_WITH_LOG_AND_FIXUP_RANGE(cp->yhigh, yhigh, dummy_type, this_plot->y_axis, NOOP, cp->yhigh = -VERYLARGE);

cp->z = width;

} /* store2d_point */

* print_points: a debugging routine to print out the points of a curve, and

* the curve structure. If curve<0, then we print the list of curves.

#if 0 /* not used */

static char *plot_type_names[4] =

{

"Function", "Data", "3D Function", "3d data"

};

static char *plot_style_names[14] =

{

"Lines", "Points", "Impulses", "LinesPoints", "Dots", "XErrorbars",

"YErrorbars", "XYErrorbars", "BoxXYError", "Boxes", "Boxerror", "Steps",

"FSteps", "Vector",

"XErrorlines", "YErrorlines", "XYErrorlines"

};

static char *plot_smooth_names[5] =

{

"None", "Unique", "CSplines", "ACSplines", "Bezier", "SBezier"

};

static void print_points(curve)

int curve; /* which curve to print */

{

int i;

if (curve < 0) {

for (this_plot = first_plot, i = 0;

this_plot != NULL;

i++, this_plot = this_plot->next_cp) {

printf("Curve %d:\n", i);

if ((int) this_plot->plot_type >= 0 && (int) (this_plot->plot_type) < 4)

printf("Plot type %d: %s\n", (int) (this_plot->plot_type),

plot_type_names[(int) (this_plot->plot_type)]);

else

printf("Plot type %d: BAD\n", (int) (this_plot->plot_type));

if ((int) this_plot->plot_style >= 0 && (int) (this_plot->plot_style) < 14)

printf("Plot style %d: %s\n", (int) (this_plot->plot_style),

plot_style_names[(int) (this_plot->plot_style)]);

else

printf("Plot style %d: BAD\n", (int) (this_plot->plot_style));

if ((int) this_plot->plot_smooth >= 0 && (int) (this_plot->plot_smooth) < 6)

printf("Plot smooth style %d: %s\n", (int) (this_plot->plot_style),

plot_smooth_names[(int) (this_plot->plot_smooth)]);

else

printf("Plot smooth style %d: BAD\n", (int) (this_plot->plot_smooth));

printf("Plot title: '%s'\n", this_plot->title);

printf("Line type %d\n", this_plot->line_type);

printf("Point type %d\n", this_plot->point_type);

printf("max points %d\n", this_plot->p_max);

printf("current points %d\n", this_plot->p_count);

printf("\n");

}

} else {

for (this_plot = first_plot, i = 0;

i < curve && this_plot != NULL;

i++, this_plot = this_plot->next_cp);

if (this_plot == NULL)

printf("Curve %d does not exist; list has %d curves\n", curve, i);

else {

printf("Curve %d, %d points\n", curve, this_plot->p_count);

for (i = 0; i < this_plot->p_count; i++) {

printf("%c x=%g y=%g z=%g xlow=%g xhigh=%g ylow=%g yhigh=%g\n",

this_plot->points[i].type == INRANGE ? 'i'

: this_plot->points[i].type == OUTRANGE ? 'o'

: 'u',

this_plot->points[i].x,

this_plot->points[i].y,

this_plot->points[i].z,

this_plot->points[i].xlow,

this_plot->points[i].xhigh,

this_plot->points[i].ylow,

this_plot->points[i].yhigh);

}

printf("\n");

}

#endif /* not used */

static void print_table(this_plot, plot_num)

struct curve_points *this_plot;

int plot_num;

{

int i, curve;

for (curve = 0; curve < plot_num;

curve++, this_plot = this_plot->next_cp) {

fprintf(gpoutfile, "#Curve %d, %d points\n#x y type\n", curve, this_plot->p_count);

for (i = 0; i < this_plot->p_count; i++) {

fprintf(gpoutfile, "%g %g %c\n",

this_plot->points[i].x,

this_plot->points[i].y,

this_plot->points[i].type == INRANGE ? 'i'

: this_plot->points[i].type == OUTRANGE ? 'o'

: 'u');

}

fputc('\n', gpoutfile);

}

/* two blank lines between plots in table output */

fputc('\n', gpoutfile);

fflush(gpoutfile);

}

* This parses the plot command after any range specifications. To support

* autoscaling on the x axis, we want any data files to define the x 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_plots()

{

int some_functions = 0;

int plot_num, line_num, point_num, xparam = 0;

char *xtitle;

int begin_token = c_token; /* so we can rewind for second pass */

int uses_axis[AXIS_ARRAY_SIZE];

uses_axis[FIRST_X_AXIS] =

uses_axis[FIRST_Y_AXIS] =

uses_axis[SECOND_X_AXIS] =

uses_axis[SECOND_Y_AXIS] = 0;

/* Reset first_plot. 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 cp_free if the list is incomplete. Making sure that

the list structure is always vaild requires some rewriting */

first_plot = NULL;

tp_ptr = &(first_plot);

plot_num = 0;

line_num = 0; /* default line type */

point_num = 0; /* default point type */

xtitle = NULL;

/*** First Pass: Read through data files ***

* This pass serves to set the xrange and to parse the command, as well

* as filling in every thing except the function data. That is done after

* the xrange is defined.

while (TRUE) {

if (END_OF_COMMAND)

int_error(c_token, "function to plot expected");

if (is_definition(c_token)) {

define();

} else {

int x_axis = 0, y_axis = 0;

int specs;

/* for datafile plot, record datafile spec for title */

int start_token = c_token, end_token;

plot_num++;

if (isstring(c_token)) { /* data file to plot */

if (parametric && xparam)

int_error(c_token, "previous parametric function not fully specified");

if (*tp_ptr)

this_plot = *tp_ptr;

else { /* no memory malloc()'d there yet */

this_plot = cp_alloc(MIN_CRV_POINTS);

*tp_ptr = this_plot;

}

this_plot->plot_type = DATA;

this_plot->plot_style = data_style;

this_plot->plot_smooth = NONE;

specs = df_open(NCOL); /* up to NCOL cols */

/* this parses data-file-specific modifiers only */

/* we'll sort points when we know style, if necessary */

if (df_binary)

int_error(c_token, "2d binary files not yet supported");

this_plot->token = end_token = c_token - 1; /* include modifiers in default title */

} else {

/* function to plot */

some_functions = 1;

if (parametric) /* working on x parametric function */

xparam = 1 - xparam;

if (*tp_ptr) {

this_plot = *tp_ptr;

cp_extend(this_plot, samples + 1);

} else { /* no memory malloc()'d there yet */

this_plot = cp_alloc(samples + 1);

*tp_ptr = this_plot;

}

this_plot->plot_type = FUNC;

this_plot->plot_style = func_style;

dummy_func = &plot_func;

plot_func.at = temp_at();

dummy_func = NULL;

/* ignore it for now */

end_token = c_token - 1;

} /* end of IS THIS A FILE OR A FUNC block */

/* deal with smooth */

if (almost_equals(c_token, "s$mooth")) {

if (END_OF_COMMAND)

int_error(c_token, "expecting smooth parameter");

else {

c_token++;

if (almost_equals(c_token, "u$nique"))

this_plot->plot_smooth = UNIQUE;

else if (almost_equals(c_token, "a$csplines"))

this_plot->plot_smooth = ACSPLINES;

else if (almost_equals(c_token, "c$splines"))

this_plot->plot_smooth = CSPLINES;

else if (almost_equals(c_token, "b$ezier"))

this_plot->plot_smooth = BEZIER;

else if (almost_equals(c_token, "s$bezier"))

this_plot->plot_smooth = SBEZIER;

else

int_error(c_token, "expecting 'unique', 'acsplines', 'csplines', 'bezier' or 'sbezier'");

}

this_plot->plot_style = LINES;

c_token++; /* skip format */

}

/* look for axes/axis */

if (almost_equals(c_token, "ax$es") || almost_equals(c_token, "ax$is")) {

if (parametric && xparam)

int_error(c_token, "previous parametric function not fully specified");

if (equals(++c_token, "x1y1")) {

x_axis = FIRST_X_AXIS;

y_axis = FIRST_Y_AXIS;

++c_token;

} else if (equals(c_token, "x2y2")) {

x_axis = SECOND_X_AXIS;

y_axis = SECOND_Y_AXIS;

++c_token;

} else if (equals(c_token, "x1y2")) {

x_axis = FIRST_X_AXIS;

y_axis = SECOND_Y_AXIS;

++c_token;

} else if (equals(c_token, "x2y1")) {

x_axis = SECOND_X_AXIS;

y_axis = FIRST_Y_AXIS;

++c_token;

} else

int_error(c_token, "axes must be x1y1, x1y2, x2y1 or x2y2");

} else {

x_axis = FIRST_X_AXIS;

y_axis = FIRST_Y_AXIS;

}

this_plot->x_axis = x_axis;

this_plot->y_axis = y_axis;

/* we can now do some checks that we deferred earlier */

if (this_plot->plot_type == DATA) {

if (!(uses_axis[x_axis] & 1) && autoscale_lx) {

if (auto_array[x_axis] & 1)

min_array[x_axis] = VERYLARGE;

if (auto_array[x_axis] & 2)

max_array[x_axis] = -VERYLARGE;

}

if (datatype[x_axis] == TIME) {

if (specs < 2)

int_error(c_token, "Need full using spec for x time data");

df_timecol[0] = 1;

}

if (datatype[y_axis] == TIME) {

if (specs < 1)

int_error(c_token, "Need using spec for y time data");

df_timecol[y_axis] = 1; /* need other cols, but I'm lazy */

}

uses_axis[x_axis] |= 1; /* separate record of datafile and func */

uses_axis[y_axis] |= 1;

} else if (!parametric || !xparam) {

/* for x part of a parametric function, axes are possibly wrong */

uses_axis[x_axis] |= 2; /* separate record of data and func */

uses_axis[y_axis] |= 2;

}

if (almost_equals(c_token, "t$itle")) {

if (parametric) {

if (xparam)

int_error(c_token, "\"title\" allowed only after parametric function fully specified");

else if (xtitle != NULL)

xtitle[0] = '\0'; /* Remove default title . */

}

c_token++;

if (isstring(c_token)) {

m_quote_capture(&(this_plot->title), c_token, c_token);

} else {

int_error(c_token, "expecting \"title\" for plot");

}

c_token++;

} else if (almost_equals(c_token, "not$itle")) {

if (xtitle != NULL)

xtitle[0] = '\0';

c_token++;

} else {

m_capture(&(this_plot->title), start_token, end_token);

if (xparam)

xtitle = this_plot->title;

}

if (almost_equals(c_token, "w$ith")) {

if (parametric && xparam)

int_error(c_token, "\"with\" allowed only after parametric function fully specified");

this_plot->plot_style = get_style();

}

/* pick up line/point specs

* - point spec allowed if style uses points, ie style&2 != 0

* - keywords for lt and pt are optional

LP_PARSE(this_plot->lp_properties, 1, this_plot->plot_style & 2,

line_num, point_num);

/* allow old-style syntax too - ignore case lt 3 4 for example */

if (!equals(c_token, ",") && !END_OF_COMMAND) {

struct value t;

this_plot->lp_properties.l_type =

this_plot->lp_properties.p_type = (int) real(const_express(&t)) - 1;

if (!equals(c_token, ",") && !END_OF_COMMAND)

this_plot->lp_properties.p_type = (int) real(const_express(&t)) - 1;

}

if (!xparam) {

if (this_plot->plot_style & 2) /* style includes points */

++point_num;

++line_num;

}

if (this_plot->plot_type == DATA) {

/* actually get the data now */

if ( get_data(this_plot) == 0) {

/* am: not a single line of data (point to be more precise)

has been found. So don't issue a misleading warning like

"x range is invalid" but stop here! */

int_error(c_token, "no data point found in specified file");

}

/* sort */

switch (this_plot->plot_smooth) { /* sort and average, if */

case UNIQUE: /* the style requires */

case CSPLINES:

case ACSPLINES:

case SBEZIER:

sort_points(this_plot);

cp_implode(this_plot);

break;

default:

; /* keep gcc -Wall happy */

}

switch (this_plot->plot_smooth) { /* create new data set */

case SBEZIER: /* by evaluation of */

case BEZIER: /* interpolation routines */

case ACSPLINES:

case CSPLINES:

gen_interp(this_plot);

View remainder of file in raw view

gnuplot-old/src/plot2d.c at 8d534a91c3459d1e57d053e425f42e8e701bd09a · gnuplot/gnuplot-old · GitHub

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