forked from gnuplot/gnuplot-old
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graphics.c
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graphics.c
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#ifndef lint
static char *RCSid = "$Id: graphics.c,v 1.4 1998/05/08 14:34:57 lhecking Exp $";
#endif
/* GNUPLOT - graphics.c */
/*[
* Copyright 1986 - 1993, 1998 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 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"
/* key placement is calculated in boundary, so we need file-wide variables
* To simplify adjustments to the key, we set all these once [depends on
* key_reverse] and use them throughout.
*/
/*{{{ local and global variables*/
static int key_sample_width; /* width of line sample */
static int key_sample_left; /* offset from x for left of line sample */
static int key_sample_right; /* offset from x for right of line sample */
static int key_point_offset; /* offset from x for point sample */
static int key_text_left; /* offset from x for left-justified text */
static int key_text_right; /* offset from x for right-justified text */
static int key_size_left; /* size of left bit of key (text or sample, depends on key_reverse) */
static int key_size_right; /* size of right part of key (including padding) */
/* I think the following should also be static ?? */
static int key_xl, key_xr, key_yt, key_yb; /* boundarys for key field */
static int max_ptitl_len = 0; /* max length of plot-titles (keys) */
static int ktitl_lines = 0; /* no lines in key_title (key header) */
static int ptitl_cnt; /* count keys with len > 0 */
static int key_cols; /* no cols of keys */
static int key_rows, key_col_wth, yl_ref;
/* penalty for doing tics by callback in gen_tics is need for
* global variables to communicate with the tic routines
* Dont need to be arrays for this
*/
static int tic_start, tic_direction, tic_text, rotate_tics, tic_hjust, tic_vjust, tic_mirror;
/* set by tic_callback - how large to draw polar radii */
static double largest_polar_circle;
/* either xformat etc or invented time format
* index with FIRST_X_AXIS etc
* global because used in gen_tics, which graph3d also uses
*/
char ticfmt[8][25];
int timelevel[8];
double ticstep[8];
static int xlablin, x2lablin, ylablin, y2lablin, titlelin, xticlin, x2ticlin;
static int key_entry_height; /* bigger of t->v_size, pointsize*t->v_tick */
static int p_width, p_height; /* pointsize * { t->h_tic | t->v_tic } */
/* there are several things on right of plot - key, y2tics and y2label
* when working out boundary, save posn of y2label for later...
* Same goes for x2label.
* key posn is also stored in key_xl, and tics go at xright
*/
static int ylabel_x, y2label_x, xlabel_y, x2label_y, title_y, time_y, time_x;
static int ylabel_y, y2label_y, xtic_y, x2tic_y, ytic_x, y2tic_x;
/*}}}*/
/*{{{ static fns and local macros*/
static void plot_impulses __PROTO((struct curve_points *plot, int yaxis_x, int xaxis_y));
static void plot_lines __PROTO((struct curve_points *plot));
static void plot_points __PROTO((struct curve_points *plot));
static void plot_dots __PROTO((struct curve_points *plot));
static void plot_bars __PROTO((struct curve_points *plot));
static void plot_boxes __PROTO((struct curve_points *plot, int xaxis_y));
static void plot_vectors __PROTO((struct curve_points *plot));
static void plot_f_bars __PROTO((struct curve_points *plot));
static void plot_c_bars __PROTO((struct curve_points *plot));
static void edge_intersect __PROTO((struct coordinate GPHUGE *points, int i, double *ex, double *ey));
static int two_edge_intersect __PROTO((struct coordinate GPHUGE *points, int i, double *lx, double *ly));
static TBOOLEAN two_edge_intersect_steps __PROTO((struct coordinate GPHUGE *points, int i, double *lx, double *ly));
static void plot_steps __PROTO((struct curve_points *plot)); /* JG */
static void plot_fsteps __PROTO((struct curve_points *plot)); /* HOE */
static void plot_histeps __PROTO((struct curve_points *plot)); /* CAC */
static void histeps_horizontal __PROTO((int *xl, int *yl, double x1, double x2, double y)); /* CAC */
static void histeps_vertical __PROTO((int *xl, int *yl, double x, double y1, double y2)); /* CAC */
static void edge_intersect_steps __PROTO((struct coordinate GPHUGE *points, int i, double *ex, double *ey)); /* JG */
static void edge_intersect_fsteps __PROTO((struct coordinate GPHUGE *points, int i, double *ex, double *ey)); /* HOE */
static TBOOLEAN two_edge_intersect_steps __PROTO((struct coordinate GPHUGE *points, int i, double *lx, double *ly)); /* JG */
static TBOOLEAN two_edge_intersect_fsteps __PROTO((struct coordinate GPHUGE *points, int i, double *lx, double *ly));
static double LogScale __PROTO((double coord, int is_log, double log_base_log, char *what, char *axis));
static double dbl_raise __PROTO((double x, int y));
static void boundary __PROTO((int scaling, struct curve_points *plots, int count));
static double make_tics __PROTO((int axis, int guide));
static int widest_tic; /* widest2d_callback keeps longest so far in here */
static void widest2d_callback __PROTO((int axis, double place, char *text, struct lp_style_type grid));
static void ytick2d_callback __PROTO((int axis, double place, char *text, struct lp_style_type grid));
static void xtick2d_callback __PROTO((int axis, double place, char *text, struct lp_style_type grid));
static void map_position __PROTO((struct position *pos, unsigned int *x, unsigned int *y, char *what));
static void mant_exp __PROTO((double log_base, double x, int scientific, double *m, int *p));
static void gprintf __PROTO((char *dest, char *format, double log_base, double x));
#if defined(sun386) || defined(AMIGA_SC_6_1)
static double CheckLog __PROTO((TBOOLEAN is_log, double base_log, double x));
#endif
/* for plotting error bars */
#define ERRORBARTIC (t->h_tic/2) /* half the width of error bar tic mark */
/*
* The Amiga SAS/C 6.2 compiler moans about macro envocations causing
* multiple calls to functions. I converted these macros to inline
* functions coping with the problem without loosing speed.
* If your compiler supports __inline, you should add it to the
* #ifdef directive
* (MGR, 1993)
*/
#ifdef AMIGA_SC_6_1
GP_INLINE static TBOOLEAN i_inrange(int z,int min,int max)
{
return((min<max) ? ((z>=min)&&(z<=max)) : ((z>=max)&&(z<=min)));
}
GP_INLINE static double f_max(double a,double b)
{
return(GPMAX(a,b));
}
GP_INLINE static double f_min(double a,double b)
{
return(GPMIN(a,b));
}
#else
#define f_max(a,b) GPMAX((a),(b))
#define f_min(a,b) GPMIN((a),(b))
#define i_inrange(z,a,b) inrange((z),(a),(b))
#endif
#define inrange(z,min,max) ((min<max) ? ((z>=min)&&(z<=max)) : ((z>=max)&&(z<=min)) )
/* True if a and b have the same sign or zero (positive or negative) */
#define samesign(a,b) ((a) * (b) >= 0)
/*}}}*/
/*{{{ more variables*/
/* Define the boundary of the plot
* These are computed at each call to do_plot, and are constant over
* the period of one do_plot. They actually only change when the term
* type changes and when the 'set size' factors change.
* - no longer true, for 'set key out' or 'set key under'. also depend
* on tic marks and multi-line labels.
* They are shared with graph3d.c since we want to use its draw_clip_line()
*/
int xleft, xright, ybot, ytop;
/* we make a local copy of the 'key' variable so that if something
* goes wrong, we can switch it off temporarily
*/
static int lkey;
/* First attempt at double axes...
* x_min etc are now accessed from a global array min_array[], max_array[]
* put the scale factors into a similar array
* for convenience in this first attack on double axes, just define x_min etc
* since code already uses x_min, etc Eventually it will be done properly
*/
extern double min_array[], max_array[];
extern int auto_array[];
extern int log_array[];
extern double base_array[], log_base_array[];
static int x_axis=FIRST_X_AXIS, y_axis=FIRST_Y_AXIS; /* current axes */
static double scale[AXIS_ARRAY_SIZE]; /* scale factors for mapping for each axis */
/* BODGES BEFORE I FIX IT UP */
#define x_min min_array[x_axis]
#define x_max max_array[x_axis]
#define y_min min_array[y_axis]
#define y_max max_array[y_axis]
/* And the functions to map from user to terminal coordinates */
#define map_x(x) (int)(xleft+(x-min_array[x_axis])*scale[x_axis]+0.5) /* maps floating point x to screen */
#define map_y(y) (int)(ybot +(y-min_array[y_axis])*scale[y_axis]+0.5) /* same for y */
/* (DFK) Watch for cancellation error near zero on axes labels */
#define SIGNIF (0.01) /* less than one hundredth of a tic mark */
#define CheckZero(x,tic) (fabs(x) < ((tic) * SIGNIF) ? 0.0 : (x))
#define NearlyEqual(x,y,tic) (fabs((x)-(y)) < ((tic) * SIGNIF))
/*}}}*/
/*{{{ CheckLog()*/
/* (DFK) For some reason, the Sun386i compiler screws up with the CheckLog
* macro, so I write it as a function on that machine.
*
* Amiga SAS/C 6.2 thinks it will do too much work calling functions in
* macro arguments twice, thus I inline theese functions. (MGR, 1993)
* If your compiler doesn't handle those macros correctly, you should
* also subscribe here. Even without inlining you gain speed with log plots
*/
#if defined(sun386) || defined(AMIGA_SC_6_1)
GP_INLINE static double
CheckLog(is_log, base_log, x)
TBOOLEAN is_log;
double base_log;
double x;
{
if (is_log)
return(pow(base_log, x));
else
return(x);
}
#else
/* (DFK) Use 10^x if logscale is in effect, else x */
#define CheckLog(is_log, base_log, x) ((is_log) ? pow(base_log, (x)) : (x))
#endif /* sun386 || SAS/C */
/*}}}*/
/*{{{ LogScale()*/
static double
LogScale(coord, is_log, log_base_log, what, axis)
double coord; /* the value */
TBOOLEAN is_log; /* is this axis in logscale? */
double log_base_log; /* if so, the log of its base */
char *what; /* what is the coord for? */
char *axis; /* which axis is this for ("x" or "y")? */
{
if (is_log) {
if (coord <= 0.0) {
char errbuf[100]; /* place to write error message */
(void) sprintf(errbuf,"%s has %s coord of %g; must be above 0 for log scale!",
what, axis, coord);
graph_error(errbuf);
} else
return(log(coord)/log_base_log);
}
return(coord);
}
/*}}}*/
/*{{{ graph_error()*/
/* handle errors during graph-plot in a consistent way */
void graph_error(text)
char *text;
{
multiplot = FALSE;
term_end_plot();
int_error(text, NO_CARET);
}
/*}}}*/
/*{{{ widest2d_callback()*/
/* we determine widest tick label by getting gen_ticks to call this
* routine with every label
*/
static void widest2d_callback(axis, place, text, grid)
int axis;
double place;
char *text;
struct lp_style_type grid;
{
int len=label_width(text, NULL);
if (len>widest_tic)
widest_tic = len;
}
/*}}}*/
/*{{{ boundary()*/
/* borders of plotting area
* computed once on every call to do_plot
*
* The order in which things is done is getting pretty critical:
* ytop depends on title, x2label, ylabels (if no rotated text)
* ybot depends on key, if TUNDER
* once we have these, we can setup the y1 and y2 tics and the
* only then can we calculate xleft and xright
* xright depends also on key TRIGHT
* then we can do x and x2 tics
*
* For set size ratio ..., everything depends on everything else...
* not really a lot we can do about that, so we lose if the plot has to
* be reduced vertically. But the chances are the
* change will not be very big, so the number of tics will not
* change dramatically.
*
* Margin computation redone by Dick Crawford (rccrawford@lanl.gov) 4/98
*/
static void boundary(scaling,plots,count)
TBOOLEAN scaling; /* TRUE if terminal is doing the scaling */
struct curve_points *plots;
int count;
{
int ytlen;
int yticlin=0, y2ticlin=0, timelin=0;
register struct termentry *t = term;
int key_h, key_w;
int can_rotate=(*t->text_angle)(1);
int xtic_textheight; /* height of xtic labels */
int x2tic_textheight; /* height of x2tic labels */
int title_textheight; /* height of title */
int xlabel_textheight; /* height of xlabel */
int x2label_textheight; /* height of x2label */
int timetop_textheight; /* height of timestamp (if at top) */
int timebot_textheight; /* height of timestamp (if at bottom) */
int ylabel_textheight; /* height of (unrotated) ylabel */
int y2label_textheight; /* height of (unrotated) y2label */
int ylabel_textwidth; /* width of (rotated) ylabel */
int y2label_textwidth; /* width of (rotated) y2label */
int timelabel_textwidth; /* width of timestamp */
int ytic_textwidth; /* width of ytic labels */
int y2tic_textwidth; /* width of y2tic labels */
int x2tic_height; /* 0 for tic_in or no x2tics, ticscale*v_tic otherwise */
int xtic_height;
int ytic_width;
int y2tic_width;
/* figure out which rotatable items are to be rotated
* (ylabel and y2label are rotated if possible) */
int vertical_timelabel = can_rotate && timelabel_rotate;
int vertical_xtics = can_rotate && rotate_xtics;
int vertical_x2tics = can_rotate && rotate_x2tics;
int vertical_ytics = can_rotate && rotate_ytics;
int vertical_y2tics = can_rotate && rotate_y2tics;
lkey = key; /* but we may have to disable it later */
xticlin = ylablin = y2lablin = xlablin = x2lablin = titlelin = 0;
/*{{{ count lines in labels and tics*/
if (*title.text) label_width(title.text, &titlelin);
if (*xlabel.text) label_width(xlabel.text, &xlablin);
if (*x2label.text) label_width(x2label.text, &x2lablin);
if (*ylabel.text) label_width(ylabel.text, &ylablin);
if (*y2label.text) label_width(y2label.text, &y2lablin);
if (xtics) label_width(xformat, &xticlin);
if (x2tics) label_width(x2format, &x2ticlin);
if (ytics) label_width(yformat, &yticlin);
if (y2tics) label_width(y2format, &y2ticlin);
if (*timelabel.text) label_width(timelabel.text, &timelin);
/*}}}*/
/*{{{ preliminary ytop calculation
*
* first compute heights of things to be written in the margin /*
/* title */
if(titlelin)
title_textheight = (int)((titlelin + title.yoffset)*(t->v_char));
else
title_textheight = 0;
/* x2label */
if(x2lablin)
x2label_textheight = (int)((x2lablin + x2label.yoffset)*(t->v_char));
else
x2label_textheight = 0;
/* tic labels */
if (x2tics&TICS_ON_BORDER) {
/* ought to consider tics on axes if axis near border */
if(vertical_x2tics) {
/* guess at tic length, since we don't know it yet
--- we'll fix it after the tic labels have been created */
x2tic_textheight = (int)(5*(t->h_char));
} else
x2tic_textheight = (int)((x2ticlin)*(t->v_char));
} else
x2tic_textheight = 0;
/* tics */
if (!tic_in && (x2tics || xtics&TICS_MIRROR) && TICS_ON_BORDER )
x2tic_height = (int)((t->v_tic)*ticscale);
else
x2tic_height = 0;
/* timestamp */
if (*timelabel.text && !timelabel_bottom && !vertical_timelabel)
timetop_textheight = (int)((timelin + timelabel.yoffset)*(t->v_char));
else
timetop_textheight = 0;
/* horizontal ylabel */
if (*ylabel.text && !can_rotate)
ylabel_textheight = (int)((ylablin + ylabel.yoffset)*(t->v_char));
else
ylabel_textheight = 0;
/* horizontal y2label */
if (*y2label.text && !can_rotate)
y2label_textheight = (int)((y2lablin + y2label.yoffset)*(t->v_char));
else
y2label_textheight = 0;
/* compute ytop from the various components
* unless tmargin is explicitly specified */
ytop = (int)((ysize+yoffset) * (t->ymax));
if (tmargin < 0) {
int top_margin = x2label_textheight + title_textheight;
if (timetop_textheight + ylabel_textheight > top_margin)
top_margin = timetop_textheight + ylabel_textheight;
if (y2label_textheight > top_margin)
top_margin = y2label_textheight;
top_margin += x2tic_height + x2tic_textheight;
if (top_margin > x2tic_height) top_margin += (int)(t->v_char);
ytop -= top_margin;
if (ytop == (int)((ysize+yoffset) * (t->ymax))) {
/* make room for the end of rotated ytics or y2tics */
ytop -= (int)((t->h_char)*2);
}
} else
ytop -= (int)((t->v_char)*tmargin);
/* end of preliminary ytop calculation }}}*/
/*{{{ tentative xleft, needed for TUNDER*/
if (lmargin >= 0)
xleft = (int)(xoffset * (t->xmax) + (t->h_char)*lmargin);
else
xleft = (int)(xoffset * (t->xmax) + (t->h_char)*2);
/*}}}*/
/*{{{ tentative xright, needed for TUNDER*/
if (rmargin >= 0)
xright = (int)((xsize+xoffset) * (t->xmax) - (t->h_char)*rmargin);
else
xright = (int)((xsize+xoffset) * (t->xmax) - (t->h_char)*2);
/*}}}*/
/*{{{ preliminary ybot calculation
* first compute heights of labels and tics */
/* tic labels */
if (xtics&TICS_ON_BORDER) {
/* ought to consider tics on axes if axis near border */
if(vertical_xtics) {
/* guess at tic length, since we don't know it yet */
xtic_textheight = (int)((t->h_char)*5);
} else
xtic_textheight = (int)((t->v_char)*(xticlin+1));
} else
xtic_textheight = 0;
/* tics */
if (!tic_in && (xtics || x2tics&TICS_MIRROR) && TICS_ON_BORDER)
xtic_height = (int)((t->v_tic)*ticscale);
else
xtic_height = 0;
/* xlabel */
if(xlablin)
/* offset is subtracted because if . 0, the margin is smaller */
xlabel_textheight = (int)((xlablin - xlabel.yoffset)*(t->v_char));
else
xlabel_textheight = 0;
/* timestamp */
if (*timelabel.text && timelabel_bottom && !vertical_timelabel)
/* offset is subtracted because if . 0, the margin is smaller */
timebot_textheight = (int)((timelin - timelabel.yoffset)*(t->v_char));
else
timebot_textheight = 0;
/* compute ybot from the various components
* unless bmargin is explicitly specified */
ybot = (int)((t->ymax) * yoffset);
if (bmargin < 0) {
ybot += (timebot_textheight > xlabel_textheight ? timebot_textheight : xlabel_textheight) + xtic_height + xtic_textheight;
if (ybot == (t->ymax) * yoffset) {
/* make room for the end of rotated ytics or y2tics */
ybot += (int)((t->h_char)*2);
}
} else
ybot += (int)(bmargin * (t->v_char));
/* end of preliminary ybot calculation }}}*/
#define KEY_PANIC(x) if (x) { lkey=0; goto key_escape; }
if (lkey) {
/*{{{ essential key features*/
p_width = pointsize * t->h_tic;
p_height = pointsize * t->v_tic;
if (key_swidth >= 0 )
key_sample_width= key_swidth*(t->h_char) + p_width;
else
key_sample_width= 0;
key_entry_height = p_height * 1.25 * key_vert_factor;
if (key_entry_height < (t->v_char) )
key_entry_height = (t->v_char)*key_vert_factor;
/* count max_len key and number keys with len > 0 */
max_ptitl_len = find_maxl_keys(plots,count,&ptitl_cnt);
if ( (ytlen = label_width(key_title,&ktitl_lines)) > max_ptitl_len )
max_ptitl_len = ytlen;
if (key_reverse) {
key_sample_left= -key_sample_width;
key_sample_right= 0;
/* if key width is being used, adjust right-justified text */
key_text_left=t->h_char;
key_text_right=(t->h_char)*(max_ptitl_len+1+key_width_fix);
key_size_left=t->h_char - key_sample_left; /* sample left is -ve */
key_size_right=key_text_right;
} else {
key_sample_left= 0;
key_sample_right= key_sample_width;
/* if key width is being used, adjust left-justified text */
key_text_left = -(int)((t->h_char)*(max_ptitl_len+1+key_width_fix));
key_text_right = -(int)(t->h_char);
key_size_left= - key_text_left;
key_size_right=key_sample_right + t->h_char;
}
key_point_offset = (key_sample_left + key_sample_right)/2;
/* advance width for cols */
key_col_wth = key_size_left + key_size_right;
key_rows = ptitl_cnt;
key_cols = 1;
/* calculate rows and cols for key - if something goes wrong,
* the tidiest way out is to set lkey=0, and a goto
*/
if (lkey == -1) {
if (key_vpos == TUNDER ) {
/* maximise no cols, limited by label-length */
key_cols = (int)(xright - xleft)/key_col_wth;
KEY_PANIC(key_cols == 0);
key_rows = (int)(ptitl_cnt+key_cols-1)/key_cols;
KEY_PANIC(key_rows==0);
/* now calculate actual no cols depending on no rows */
key_cols = (int)(ptitl_cnt+key_rows-1)/key_rows;
KEY_PANIC(key_cols==0);
key_col_wth = (int)(xright - xleft)/key_cols;
/* we divide into columns, then centre in column by considering ratio
* of key_left_size to key_right_size
* key_size_left/(key_size_left+key_size_right) * (xright-xleft)/key_cols
* do one integer division to maximise accuracy (hope we dont overflow !)
*/
key_xl = xleft - key_size_left + ((xright-xleft)*key_size_left) / (key_cols*(key_size_left+key_size_right));
key_xr = key_xl + key_col_wth * (key_cols-1) + key_size_left + key_size_right;
key_yb = t->ymax * yoffset;
key_yt = key_yb + key_rows * key_entry_height + ktitl_lines * t->v_char;
ybot += key_entry_height*key_rows + (int)((t->v_char)*(ktitl_lines+1));
} else {
/* maximise no rows, limited by ytop-ybot */
int i = (int)(ytop-ybot-(ktitl_lines+1)*(t->v_char))/key_entry_height;
KEY_PANIC(i==0);
if (ptitl_cnt > i) {
key_cols = (int)(ptitl_cnt+i-1)/i;
/* now calculate actual no rows depending on no cols */
KEY_PANIC(key_cols==0);
key_rows = (int)(ptitl_cnt+key_cols-1)/key_cols;
}
}
/* come here if we detect a division by zero in key calculations */
key_escape:
; /* ansi requires this */
}
/*}}}*/
}
/*{{{ set up y and y2 tics*/
{
/* setup_tics allows max number of tics to be specified
* but users dont like it to change with size and font,
* so we use value of 20, which is 3.5 behaviour.
* Note also that if format is '', yticlin=0, so this gives
* division by zero.
* int guide = (ytop-ybot)/term->v_char;
*/
if (ytics) setup_tics(FIRST_Y_AXIS, &yticdef, yformat, 20 /*(int) (guide/yticlin)*/);
if (y2tics) setup_tics(SECOND_Y_AXIS, &y2ticdef, y2format, 20 /*(int) (guide/y2ticlin)*/);
}
/*}}}*/
/*{{{ recompute xleft based on widths of ytics, ylabel etc
unless it has been explicitly set by lmargin */
/* tic labels */
if ( ytics&TICS_ON_BORDER ) {
if (vertical_ytics)
ytic_textwidth = (int)((t->v_char)*yticlin);
else {
widest_tic=0; /* reset the global variable ... */
/* get gen_tics to call widest2d_callback with all labels
* the latter sets widest_tic to the length of the widest one
* ought to consider tics on axis if axis near border...
*/
gen_tics(FIRST_Y_AXIS, &yticdef, 0, 0, 0.0, widest2d_callback);
ytic_textwidth = (int)((t->h_char)*(widest_tic+2));
}
} else {
ytic_textwidth = 0;
}
/* tics */
if (!tic_in && (ytics || y2tics&TICS_MIRROR) && TICS_ON_BORDER)
ytic_width = (int)((t->h_tic)*ticscale);
else
ytic_width = 0;
/* ylabel */
if (*ylabel.text && can_rotate)
ylabel_textwidth = (int)((ylablin + ylabel.yoffset)*(t->v_char));
else
ylabel_textwidth = 0;
/* timestamp */
if (*timelabel.text && vertical_timelabel)
timelabel_textwidth = (int)((timelin + timelabel.yoffset)*(t->v_char));
else
timelabel_textwidth = 0;
/* compute xleft from the various components
* unless lmargin is explicitly specified */
xleft = (int)((t->xmax) * xoffset);
if (lmargin < 0) {
xleft += (timelabel_textwidth > ylabel_textwidth ? timelabel_textwidth : ylabel_textwidth) + ytic_width + ytic_textwidth;
if (xleft == (t->xmax) * xoffset) {
/* make room for end of xtic or x2tic label */
xleft += (int)((t->h_char)*2);
}
} else
xleft += (int)(lmargin * (t->h_char));
/* end of xleft calculation }}}*/
/*{{{ recompute xright based on widest y2tic. y2labels, key TOUT
unless it has been explicitly set by rmargin */
/* tic labels */
if ( y2tics&TICS_ON_BORDER ) {
if ( vertical_y2tics )
y2tic_textwidth = (int)((t->v_char)*y2ticlin);
else {
widest_tic=0; /* reset the global variable ... */
/* get gen_tics to call widest2d_callback with all labels
* the latter sets widest_tic to the length of the widest one
* ought to consider tics on axis if axis near border...
*/
gen_tics(SECOND_Y_AXIS, &y2ticdef, 0, 0, 0.0, widest2d_callback);
y2tic_textwidth = (int)((t->h_char)*(widest_tic+2));
}
} else {
y2tic_textwidth = 0;
}
/* tics */
if (!tic_in && (y2tics || ytics&TICS_MIRROR) && TICS_ON_BORDER)
y2tic_width = (int)((t->h_tic)*ticscale);
else
y2tic_width = 0;
/* y2label */
if (can_rotate && *y2label.text)
/* offset is subtracted because if . 0, the margin is smaller */
y2label_textwidth = (int)((y2lablin + 1 - y2label.yoffset)*(t->v_char));
else
y2label_textwidth = 0;
/* compute xright from the various components
* unless rmargin is explicitly specified */
xright = (int)((t->xmax) * (xsize + xoffset));
if (rmargin < 0) {
xright -= y2label_textwidth + y2tic_width + y2tic_textwidth;
/* adjust for outside key */
if ( lkey == -1 && key_hpos == TOUT ) {
xright -= key_col_wth*key_cols;
key_xl = xright + (int)(t->h_tic);
}
if (xright == (t->xmax) * (xsize + xoffset)) {
/* make room for end of xtic or x2tic label */
xright -= (int)((t->h_char)*2);
}
} else
xright -= (int)(rmargin * (t->h_char));
/* end of xright calculation }}}*/
if (aspect_ratio != 0.0)
{
double current_aspect_ratio;
if (aspect_ratio < 0 && (max_array[x_axis] - min_array[x_axis]) != 0.0)
{
current_aspect_ratio = - aspect_ratio * (max_array[y_axis]-min_array[y_axis]) / \
(max_array[x_axis]-min_array[x_axis]);
}
else
current_aspect_ratio = aspect_ratio;
/*{{{ set aspect ratio if valid and sensible*/
if (current_aspect_ratio >= 0.01 && current_aspect_ratio <= 100.0) {
double current = ( (double) (ytop-ybot)) / ( (double) (xright-xleft) );
double required= ( current_aspect_ratio * (double) t->v_tic) / ( (double) t->h_tic);
if (current > required) {
/* too tall */
ytop = ybot + required * (xright-xleft);
} else {
int y2 = y2label_x - xright;
xright = xleft + (ytop-ybot)/required;
y2label_x = xright + y2;
}
}
/*}}}*/
}
/*{{{ set up x and x2 tics*/
/* we should base the guide on the width of the xtics, but we cannot
* use widest_tics until tics are set up. Bit of a downer - let us
* assume tics are 5 characters wide
*/
{
/* see equivalent code for ytics above
* int guide = (xright - xleft) / (5*t->h_char);
*/
if (xtics) setup_tics(FIRST_X_AXIS, &xticdef, xformat, 20 /*guide*/);
if (x2tics) setup_tics(SECOND_X_AXIS, &x2ticdef, x2format, 20 /*guide*/);
}
/*}}}*/
/* adjust top and bottom margins for tic label rotation */
if (tmargin < 0 && x2tics&TICS_ON_BORDER && can_rotate && rotate_x2tics) {
widest_tic=0; /* reset the global variable ... */
gen_tics(SECOND_X_AXIS, &x2ticdef, 0, 0, 0.0, widest2d_callback);
x2tic_textheight += (int)((t->h_char)*(widest_tic-4));
ytop -= (int)((t->h_char)*(widest_tic-4));
}
if (bmargin < 0 && xtics&TICS_ON_BORDER && vertical_xtics) {
widest_tic=0; /* reset the global variable ... */
gen_tics(FIRST_X_AXIS, &xticdef, 0, 0, 0.0, widest2d_callback);
xtic_textheight += (int)((t->h_char)*(widest_tic-4));
ybot += (int)((t->h_char)*(widest_tic-4));
}
/* compute coordinates for axis labels, title et al
* (some of these may not be used) */
x2label_y = ytop + x2tic_height + x2tic_textheight + x2label_textheight;
title_y = x2label_y + title_textheight;
ylabel_y = ytop + x2tic_height + x2tic_textheight + ylabel_textheight;
y2label_y = ytop + x2tic_height + x2tic_textheight + y2label_textheight;
xlabel_y = ybot - xtic_height - xtic_textheight + (int)(xlabel.yoffset*(t->v_char));
ylabel_x = xleft - ytic_width - ytic_textwidth;
if (can_rotate && *ylabel.text) {
ylabel_x -= ylabel_textwidth + (int)((ylabel.xoffset)*(t->h_char));
if (vertical_ytics)
ylabel_x -= (int)(t->h_char);
}
y2label_x = xright + y2tic_width + y2tic_textwidth;
if (can_rotate && *y2label.text) {
y2label_x += y2label_textwidth + (int)((y2label.xoffset-2)*(t->h_char));
if (vertical_y2tics)
y2label_x += (int)(t->h_char);
}
if (vertical_timelabel) {
if (timelabel_bottom)
time_y = xlabel_y;
else
time_y = title_y;
} else {
if (timelabel_bottom)
time_y = xlabel_y + (int)(timelabel.yoffset*(t->v_char));
else if (ylabel_textheight > 0)
time_y = ylabel_y + timetop_textheight;
else
time_y = ytop + x2tic_height + x2tic_textheight + timetop_textheight;
}
time_x = xleft - ytic_width - ytic_textwidth;
if (vertical_timelabel) {
time_x -= timelabel_textwidth - (int)(t->h_char);
if (vertical_ytics)
time_x -= (int)(t->h_char);
}
xtic_y = ybot - xtic_height - ( vertical_xtics? (int)(t->h_char) : (int)(t->v_char) );
x2tic_y = ytop + x2tic_height + ( vertical_x2tics? (int)(t->h_char) : x2tic_textheight );
ytic_x = xleft - ytic_width - ( vertical_ytics? ytic_textwidth : (int)(t->h_char) );
y2tic_x = xright + y2tic_width + ( vertical_y2tics? (int)(t->v_char) : (int)(t->h_char) );
/* restore text to horizontal [we tested rotation above] */
(void)(*t->text_angle)(0);
/* needed for map_position() below */
scale[FIRST_Y_AXIS] = (ytop - ybot)/(max_array[FIRST_Y_AXIS] - min_array[FIRST_Y_AXIS]);
scale[FIRST_X_AXIS] = (xright - xleft)/(max_array[FIRST_X_AXIS] - min_array[FIRST_X_AXIS]);
scale[SECOND_Y_AXIS] = (ytop - ybot)/(max_array[SECOND_Y_AXIS] - min_array[SECOND_Y_AXIS]);
scale[SECOND_X_AXIS] = (xright - xleft)/(max_array[SECOND_X_AXIS] - min_array[SECOND_X_AXIS]);
/*{{{ calculate the window in the grid for the key*/
if (lkey==1 || (lkey==-1 && key_vpos != TUNDER)) {
/* calculate space for keys to prevent grid overwrite the keys */
/* do it even if there is no grid, as do_plot will use these to position key */
key_w = key_col_wth*key_cols;
key_h = (ktitl_lines) * t->v_char + key_rows * key_entry_height;
if (lkey == -1) {
if ( key_vpos == TTOP ) {
key_yt = (int) ytop - (t->v_tic);
key_yb = key_yt - key_h;
} else {
key_yb = ybot + (t->v_tic);
key_yt = key_yb + key_h;
}
if ( key_hpos == TLEFT ) {
key_xl = xleft + (t->h_char); /* for Left just */
key_xr = key_xl + key_w;
} else if (key_hpos == TRIGHT) {
key_xr = xright - (t->h_char); /* for Right just */
key_xl = key_xr - key_w;
} else /* TOUT */ {
/* do this here for do_plot() */
/* align right first since rmargin may be manual */
key_xr = (xsize+xoffset) * (t->xmax) - (t->h_char);
key_xl = key_xr - key_w;
}
} else {
unsigned int x,y;
map_position(&key_user_pos, &x, &y, "key");
key_xl = x - key_size_left;
key_xr = key_xl + key_w;
key_yt = y + (ktitl_lines ? t->v_char : key_entry_height)/2;
key_yb = key_yt - key_h;
}
}
/*}}}*/
}
/*}}}*/
/*{{{ dbl_raise()*/
static double dbl_raise(x,y)
double x;
int y;
{
register int i=abs(y);
double val=1.0;
while (--i >= 0)
val *= x;
if (y < 0 ) return (1.0/val);
return(val);
}
/*}}}*/
/*{{{ timetic_fmt()*/
void
timetic_format(axis,amin,amax)
int axis;
double amin, amax;
{
struct tm tmin, tmax;
*ticfmt[axis]=0; /* make sure we strcat to empty string */
ggmtime(&tmin,(double)time_tic_just(timelevel[axis],amin));
ggmtime(&tmax,(double)time_tic_just(timelevel[axis],amax));
/*
if ( tmax.tm_year == tmin.tm_year &&
tmax.tm_mon == tmin.tm_mon &&
tmax.tm_mday == tmin.tm_mday ) {
*/
if ( tmax.tm_year == tmin.tm_year &&
tmax.tm_yday == tmin.tm_yday ) {
/* same day, skip date */
if ( tmax.tm_hour != tmin.tm_hour ) {
strcpy(ticfmt[axis],"%H");
}
if ( timelevel[axis] < 3 ) {
if (strlen(ticfmt[axis]))
strcat(ticfmt[axis],":");
strcat(ticfmt[axis],"%M");
}
if ( timelevel[axis] < 2 ) {
strcat(ticfmt[axis],":%S");
}
} else {
if ( tmax.tm_year != tmin.tm_year ) {
/* different years, include year in ticlabel */
/* check convention, day/month or month/day */
if (strchr(timefmt,'m') < strchr(timefmt,'d')) {
strcpy(ticfmt[axis],"%m/%d/%");
} else {
strcpy(ticfmt[axis],"%d/%m/%");
}
if ( ((int)(tmax.tm_year/100)) != ((int)(tmin.tm_year/100)) ) {
strcat(ticfmt[axis],"Y");
} else {
strcat(ticfmt[axis],"y");
}
} else {
if (strchr(timefmt,'m') < strchr(timefmt,'d')) {
strcpy(ticfmt[axis],"%m/%d");
} else {
strcpy(ticfmt[axis],"%d/%m");
}
}
if ( timelevel[axis] < 4 ) {
strcat(ticfmt[axis],"\n%H:%M");
}
}
}
/*}}}*/
/*{{{ set_tic()*/
/* the guide parameter was intended to allow the number of tics
* to depend on the relative sizes of the plot and the font.
* It is the approximate upper limit on number of tics allowed.
* But it did not go down well with the users.
* A value of 20 gives the same behaviour as 3.5, so that is