gnuplot-old/src/graphics.c at gnuplot-4-4-alpha · gnuplot/gnuplot-old · GitHub

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#ifndef lint

static char *RCSid() { return RCSid("$Id: graphics.c,v 1.302 2009/05/13 03:49:48 sfeam Exp $"); }

#endif

/* GNUPLOT - graphics.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.

]*/

/* Daniel Sebald: added plot_image_or_update_axes() routine for images.

* (5 November 2003)

#include "graphics.h"

#include "color.h"

#include "pm3d.h"

#include "plot.h"

#include "alloc.h"

#include "axis.h"

#include "command.h"

#include "misc.h"

#include "gp_time.h"

#include "gadgets.h"

/* FIXME HBB 20010822: this breaks the plan of disentangling graphics

* and plot2d, because each #include's the other's header: */

#include "plot2d.h" /* for boxwidth */

#include "term_api.h"

#include "util.h"

/* Externally visible/modifiable status variables */

/* 'set offset' --- artificial buffer zone between coordinate axes and

* the area actually covered by the data */

t_position loff = {first_axes, 0.0};

t_position roff = {first_axes, 0.0};

t_position toff = {first_axes, 0.0};

t_position boff = {first_axes, 0.0};

/* set bars */

double bar_size = 1.0;

int bar_layer = LAYER_FRONT;

/* 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) */

static int max_ptitl_len = 0; /* max length of plot-titles (keys) */

static double ktitl_lines = 0; /* no lines in key->title (key header) */

static int ptitl_cnt; /* count keys with len > 0 */

static int key_rows, key_col_wth, yl_ref;

/* set by tic_callback - how large to draw polar radii */

static double largest_polar_circle;

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.

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;

/*}}} */

/* Status information for stacked histogram plots */

static struct coordinate GPHUGE *stackheight = NULL; /* top of previous row */

static int stack_count; /* points actually used */

static void place_histogram_titles __PROTO((void));

/*{{{ static fns and local macros */

static void recheck_ranges __PROTO((struct curve_points * plot));

static void plot_border __PROTO((void));

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_filledcurves __PROTO((struct curve_points * plot));

static void finish_filled_curve __PROTO((int, gpiPoint *, struct curve_points *));

static void plot_betweencurves __PROTO((struct curve_points * plot));

static void fill_missing_corners __PROTO((gpiPoint *corners, int *points, int exit, int reentry, int updown, int leftright));

static void fill_between __PROTO((double, double, double, double, double, double, double, double, struct curve_points *));

static TBOOLEAN bound_intersect __PROTO((struct coordinate GPHUGE * points, int i, double *ex, double *ey, filledcurves_opts *filledcurves_options));

static gpiPoint *fill_corners __PROTO((int, unsigned int, unsigned int, unsigned int, unsigned int));

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 place_labels __PROTO((struct text_label * listhead, int layer, TBOOLEAN clip));

static void place_arrows __PROTO((int layer));

static void place_grid __PROTO((void));

static int edge_intersect __PROTO((struct coordinate GPHUGE * points, int i, double *ex, double *ey));

static TBOOLEAN 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 void boundary __PROTO((struct curve_points * plots, int count));

/* HBB 20010118: these should be static, but can't --- HP-UX assembler bug */

void ytick2d_callback __PROTO((AXIS_INDEX, double place, char *text, struct lp_style_type grid));

void xtick2d_callback __PROTO((AXIS_INDEX, double place, char *text, struct lp_style_type grid));

int histeps_compare __PROTO((SORTFUNC_ARGS p1, SORTFUNC_ARGS p2));

static void get_arrow __PROTO((struct arrow_def* arrow, int* sx, int* sy, int* ex, int* ey));

static void map_position_double __PROTO((struct position* pos, double* x, double* y, const char* what));

static int find_maxl_keys __PROTO((struct curve_points *plots, int count, int *kcnt));

static void do_key_sample __PROTO((struct curve_points *this_plot, legend_key *key,

char *title, struct termentry *t, int xl, int yl));

static TBOOLEAN check_for_variable_color __PROTO((struct curve_points *plot, struct coordinate *point));

#ifdef EAM_OBJECTS

static void plot_circles __PROTO((struct curve_points *plot));

static void do_rectangle __PROTO((int dimensions, t_object *this_object, int style));

#endif

/* for plotting error bars

* half the width of error bar tic mark

#define ERRORBARTIC GPMAX((t->h_tic/2),1)

/* For tracking exit and re-entry of bounding curves that extend out of plot */

/* these must match the bit values returned by clip_point(). */

#define LEFT_EDGE 1

#define RIGHT_EDGE 2

#define BOTTOM_EDGE 4

#define TOP_EDGE 8

#define clip_fill ((plot->filledcurves_options.closeto == FILLEDCURVES_CLOSED) || clip_lines2)

* 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 losing 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

/* True if a and b have the same sign or zero (positive or negative) */

#define samesign(a,b) ((a) * (b) >= 0)

/*}}} */

/*{{{ more variables */

/* we make a local copy of the 'key' variable so that if something

* goes wrong, we can switch it off temporarily

static TBOOLEAN lkey;

/*}}} */

static int

find_maxl_keys(struct curve_points *plots, int count, int *kcnt)

{

int mlen, len, curve, cnt;

struct curve_points *this_plot;

mlen = cnt = 0;

this_plot = plots;

for (curve = 0; curve < count; this_plot = this_plot->next, curve++) {

if (this_plot->title && !this_plot->title_is_suppressed) {

ignore_enhanced(this_plot->title_no_enhanced);

len = estimate_strlen(this_plot->title);

if (len != 0) {

cnt++;

if (len > mlen)

mlen = len;

}

ignore_enhanced(FALSE);

}

/* Check for new histogram here and save space for divider */

if (this_plot->plot_style == HISTOGRAMS

&& this_plot->histogram_sequence == 0 && cnt > 1)

cnt++;

/* Check for column-stacked histogram with key entries */

if (this_plot->plot_style == HISTOGRAMS && this_plot->labels) {

text_label *key_entry = this_plot->labels->next;

for (; key_entry; key_entry=key_entry->next) {

cnt++;

len = key_entry->text ? estimate_strlen(key_entry->text) : 0;

if (len > mlen)

mlen = len;

}

if (kcnt != NULL)

*kcnt = cnt;

return (mlen);

}

/*{{{ boundary() */

/* borders of plotting area

* computed once on every call to do_plot

* The order in which things is done is getting pretty critical:

* plot_bounds.ytop depends on title, x2label, ylabels (if no rotated text)

* plot_bounds.ybot depends on key, if "under"

* once we have these, we can setup the y1 and y2 tics and the

* only then can we calculate plot_bounds.xleft and plot_bounds.xright

* plot_bounds.xright depends also on key RIGHT

* 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(struct curve_points *plots, int count)

{

int yticlin = 0, y2ticlin = 0, timelin = 0;

legend_key *key = &keyT;

struct termentry *t = term;

int key_h, key_w;

/* FIXME HBB 20000506: this line is the reason for the 'D0,1;D1,0'

* bug in the HPGL terminal: we actually carry out the switch of

* text orientation, just for finding out if the terminal can do

* that. *But* we're not in graphical mode, yet, so this call

* yields undesirable results */

int can_rotate = (*t->text_angle) (TEXT_VERTICAL);

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_textwidth=0; /* amount by which the xtic label protrude to the right */

int xtic_height;

int ytic_width;

int y2tic_width;

int key_cols = 1; /* # columns of keys */

/* figure out which rotatable items are to be rotated

* (ylabel and y2label are rotated if possible) */

int vertical_timelabel = can_rotate ? timelabel_rotate : 0;

int vertical_xtics = can_rotate ? axis_array[FIRST_X_AXIS].tic_rotate : 0;

int vertical_x2tics = can_rotate ? axis_array[SECOND_X_AXIS].tic_rotate : 0;

int vertical_ytics = can_rotate ? axis_array[FIRST_Y_AXIS].tic_rotate : 0;

int vertical_y2tics = can_rotate ? axis_array[SECOND_Y_AXIS].tic_rotate : 0;

TBOOLEAN shift_labels_to_border = FALSE;

lkey = key->visible; /* 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 (axis_array[FIRST_X_AXIS].label.text)

label_width(axis_array[FIRST_X_AXIS].label.text, &xlablin);

/* This should go *inside* label_width(), but it messes up the key title */

/* Imperfect check for subscripts or superscripts */

if ((term->flags & TERM_ENHANCED_TEXT) && axis_array[FIRST_X_AXIS].label.text

&& strpbrk(axis_array[FIRST_X_AXIS].label.text, "_^"))

xlablin++;

if (axis_array[SECOND_X_AXIS].label.text)

label_width(axis_array[SECOND_X_AXIS].label.text, &x2lablin);

if (axis_array[FIRST_Y_AXIS].label.text)

label_width(axis_array[FIRST_Y_AXIS].label.text, &ylablin);

if (axis_array[SECOND_Y_AXIS].label.text)

label_width(axis_array[SECOND_Y_AXIS].label.text, &y2lablin);

if (axis_array[FIRST_X_AXIS].ticmode) {

label_width(axis_array[FIRST_X_AXIS].formatstring, &xticlin);

/* Reserve room for user tic labels even if format of autoticks is "" */

if (xticlin == 0 && axis_array[FIRST_X_AXIS].ticdef.def.user)

xticlin = 1;

}

if (axis_array[SECOND_X_AXIS].ticmode)

label_width(axis_array[SECOND_X_AXIS].formatstring, &x2ticlin);

if (axis_array[FIRST_Y_AXIS].ticmode)

label_width(axis_array[FIRST_Y_AXIS].formatstring, &yticlin);

if (axis_array[SECOND_Y_AXIS].ticmode)

label_width(axis_array[SECOND_Y_AXIS].formatstring, &y2ticlin);

if (timelabel.text)

label_width(timelabel.text, &timelin);

/*}}} */

/*{{{ preliminary plot_bounds.ytop calculation */

/* first compute heights of things to be written in the margin */

/* title */

if (titlelin) {

double tmpx, tmpy;

map_position_r(&(title.offset), &tmpx, &tmpy, "boundary");

title_textheight = (int) ((titlelin + 1) * (t->v_char) + tmpy);

} else

title_textheight = 0;

/* x2label */

if (x2lablin) {

double tmpx, tmpy;

map_position_r(&(axis_array[SECOND_X_AXIS].label.offset),

&tmpx, &tmpy, "boundary");

x2label_textheight = (int) (x2lablin * t->v_char + tmpy);

if (!axis_array[SECOND_X_AXIS].ticmode)

x2label_textheight += 0.5 * t->v_char;

} else

x2label_textheight = 0;

/* tic labels */

if (axis_array[SECOND_X_AXIS].ticmode & 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 (!axis_array[SECOND_X_AXIS].tic_in

&& ((axis_array[SECOND_X_AXIS].ticmode & TICS_ON_BORDER)

|| ((axis_array[FIRST_X_AXIS].ticmode & TICS_MIRROR)

&& (axis_array[FIRST_X_AXIS].ticmode & TICS_ON_BORDER))))

x2tic_height = (int) (t->v_tic * axis_array[SECOND_X_AXIS].ticscale);

else

x2tic_height = 0;

/* timestamp */

if (timelabel.text && !timelabel_bottom) {

double tmpx, tmpy;

map_position_r(&(timelabel.offset), &tmpx, &tmpy, "boundary");

timetop_textheight = (int) ((timelin + 2) * t->v_char + tmpy);

} else

timetop_textheight = 0;

/* horizontal ylabel */

if (axis_array[FIRST_Y_AXIS].label.text && !can_rotate) {

double tmpx, tmpy;

map_position_r(&(axis_array[FIRST_Y_AXIS].label.offset),

&tmpx, &tmpy, "boundary");

ylabel_textheight = (int) (ylablin * t->v_char + tmpy);

} else

ylabel_textheight = 0;

/* horizontal y2label */

if (axis_array[SECOND_Y_AXIS].label.text && !can_rotate) {

double tmpx, tmpy;

map_position_r(&(axis_array[SECOND_Y_AXIS].label.offset),

&tmpx, &tmpy, "boundary");

y2label_textheight = (int) (y2lablin * t->v_char + tmpy);

} else

y2label_textheight = 0;

/* compute plot_bounds.ytop from the various components

* unless tmargin is explicitly specified */

plot_bounds.ytop = (int) (0.5 + (ysize + yoffset) * (t->ymax-1));

if (tmargin.scalex == screen) {

/* Specified as absolute position on the canvas */

plot_bounds.ytop = (tmargin.x) * (float)(t->ymax-1);

} else if (tmargin.x >=0) {

/* Specified in terms of character height */

plot_bounds.ytop -= (int)(tmargin.x * (float)t->v_char + 0.5);

} else {

/* Auto-calculation of space required */

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;

/* x2tic_height and x2tic_textheight are computed as only the

* relevant heights, but they nonetheless need a blank

* space above them */

if (top_margin > x2tic_height)

top_margin += (int) t->v_char;

plot_bounds.ytop -= top_margin;

if (plot_bounds.ytop >= (ysize + yoffset) * (t->ymax-1)) {

/* make room for the end of rotated ytics or y2tics */

plot_bounds.ytop -= (int) (t->h_char * 2);

}

/* end of preliminary plot_bounds.ytop calculation }}} */

/*{{{ preliminary plot_bounds.xleft, needed for "under" */

if (lmargin.scalex == screen)

plot_bounds.xleft = lmargin.x * (float)t->xmax;

else

plot_bounds.xleft = xoffset * t->xmax

+ t->h_char * (lmargin.x >= 0 ? lmargin.x : 1);

/*}}} */

/*{{{ tentative plot_bounds.xright, needed for "under" */

if (rmargin.scalex == screen)

plot_bounds.xright = rmargin.x * (float)(t->xmax - 1);

else

plot_bounds.xright = (xsize + xoffset) * (t->xmax - 1)

- t->h_char * (rmargin.x >= 0 ? rmargin.x : 2);

/*}}} */

/*{{{ preliminary plot_bounds.ybot calculation

* first compute heights of labels and tics */

/* tic labels */

shift_labels_to_border = FALSE;

if (axis_array[FIRST_X_AXIS].ticmode & TICS_ON_AXIS) {

/* FIXME: This test for how close the axis is to the border does not match */

/* the tests in axis_output_tics(), and assumes FIRST_Y_AXIS. */

if (!inrange(0.0, axis_array[FIRST_Y_AXIS].min, axis_array[FIRST_Y_AXIS].max))

shift_labels_to_border = TRUE;

if (0.05 > fabs( axis_array[FIRST_Y_AXIS].min

/ (axis_array[FIRST_Y_AXIS].max - axis_array[FIRST_Y_AXIS].min)))

shift_labels_to_border = TRUE;

}

if ((axis_array[FIRST_X_AXIS].ticmode & TICS_ON_BORDER)

|| shift_labels_to_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 (!axis_array[FIRST_X_AXIS].tic_in

&& ((axis_array[FIRST_X_AXIS].ticmode & TICS_ON_BORDER)

|| ((axis_array[SECOND_X_AXIS].ticmode & TICS_MIRROR)

&& (axis_array[SECOND_X_AXIS].ticmode & TICS_ON_BORDER))))

xtic_height = (int) (t->v_tic * axis_array[FIRST_X_AXIS].ticscale);

else

xtic_height = 0;

/* xlabel */

if (xlablin) {

double tmpx, tmpy;

map_position_r(&(axis_array[FIRST_X_AXIS].label.offset),

&tmpx, &tmpy, "boundary");

/* offset is subtracted because if > 0, the margin is smaller */

/* textheight is inflated by 0.2 to allow descenders to clear bottom of canvas */

xlabel_textheight = (((float)xlablin + 0.2) * t->v_char - tmpy);

if (!axis_array[FIRST_X_AXIS].ticmode)

xlabel_textheight += 0.5 * t->v_char;

} else

xlabel_textheight = 0;

/* timestamp */

if (timelabel.text && timelabel_bottom) {

/* && !vertical_timelabel)

* DBT 11-18-98 resize plot for vertical timelabels too !

double tmpx, tmpy;

map_position_r(&(timelabel.offset), &tmpx, &tmpy, "boundary");

/* offset is subtracted because if . 0, the margin is smaller */

timebot_textheight = (int) (timelin * t->v_char - tmpy);

} else

timebot_textheight = 0;

/* compute plot_bounds.ybot from the various components

* unless bmargin is explicitly specified */

plot_bounds.ybot = yoffset * (float)t->ymax;

if (bmargin.scalex == screen) {

/* Absolute position for bottom of plot */

plot_bounds.ybot = bmargin.x * (float)t->ymax;

} else if (bmargin.x >= 0) {

/* Position based on specified character height */

plot_bounds.ybot += bmargin.x * (float)t->v_char + 0.5;

} else {

plot_bounds.ybot += xtic_height + xtic_textheight;

if (xlabel_textheight > 0)

plot_bounds.ybot += xlabel_textheight;

if (timebot_textheight > 0)

plot_bounds.ybot += timebot_textheight;

/* HBB 19990616: round to nearest integer, required to escape

* floating point inaccuracies */

if (plot_bounds.ybot == (int) (t->ymax * yoffset)) {

/* make room for the end of rotated ytics or y2tics */

plot_bounds.ybot += (int) (t->h_char * 2);

}

/* end of preliminary plot_bounds.ybot calculation }}} */

if (lkey) {

TBOOLEAN key_panic = FALSE;

/*{{{ 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;

/* HBB 20020122: safeguard to prevent division by zero later */

if (key_entry_height == 0)

key_entry_height = 1;

/* Count max_len key and number keys with len > 0 */

max_ptitl_len = find_maxl_keys(plots, count, &ptitl_cnt);

/* Key title length and height */

if (key->title) {

int ytlen, ytheight;

ytlen = label_width(key->title, &ytheight);

ytlen -= key->swidth + 2;

/* EAM FIXME */

if ((ytlen > max_ptitl_len) && (key->stack_dir != GPKEY_HORIZONTAL))

max_ptitl_len = ytlen;

ktitl_lines = (int)ytheight;

}

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 (key->stack_dir == GPKEY_HORIZONTAL) {

/* maximise no cols, limited by label-length */

key_cols = (int) (plot_bounds.xright - plot_bounds.xleft) / key_col_wth;

/* EAM Dec 2004 - Rather than turn off the key, try to squeeze */

if (key_cols == 0) {

key_cols = 1;

key_panic = TRUE;

key_col_wth = (plot_bounds.xright - plot_bounds.xleft);

}

key_rows = (int) (ptitl_cnt + key_cols - 1) / key_cols;

/* now calculate actual no cols depending on no rows */

key_cols = (key_rows == 0) ? 1

: (int) (ptitl_cnt + key_rows - 1) / key_rows;

if (key_cols == 0) {

key_cols = 1;

key_panic = TRUE;

}

} else {

/* maximise no rows, limited by plot_bounds.ytop-plot_bounds.ybot */

int i = (int) (plot_bounds.ytop - plot_bounds.ybot - key->height_fix * t->v_char

- (ktitl_lines + 1) * t->v_char)

/ key_entry_height;

if (i == 0) {

i = 1;

key_panic = TRUE;

}

if (ptitl_cnt > i) {

key_cols = (int) (ptitl_cnt + i - 1) / i;

/* now calculate actual no rows depending on no cols */

if (key_cols == 0) {

key_cols = 1;

key_panic = TRUE;

}

key_rows = (int) (ptitl_cnt + key_cols - 1) / key_cols;

}

/* adjust for outside key, leave manually set margins alone */

if ((key->region == GPKEY_AUTO_EXTERIOR_LRTBC && (key->vpos != JUST_CENTRE || key->hpos != CENTRE))

|| key->region == GPKEY_AUTO_EXTERIOR_MARGIN) {

int more = 0;

if (key->margin == GPKEY_BMARGIN && bmargin.x < 0) {

more = key_entry_height * key_rows + (int) (t->v_char * (ktitl_lines + 1))

+ (int) (key->height_fix * t->v_char);

if (plot_bounds.ybot + more > plot_bounds.ytop)

key_panic = TRUE;

else

plot_bounds.ybot += more;

} else if (key->margin == GPKEY_TMARGIN && tmargin.x < 0) {

more = key_entry_height * key_rows + (int) (t->v_char * (ktitl_lines + 1))

- (int) (key->height_fix * t->v_char);

if (plot_bounds.ytop - more < plot_bounds.ybot)

key_panic = TRUE;

else

plot_bounds.ytop -= more;

} else if (key->margin == GPKEY_LMARGIN && lmargin.x < 0) {

more = key_col_wth * key_cols;

if (plot_bounds.xleft + more > plot_bounds.xright)

key_panic = TRUE;

else

plot_bounds.xleft += more;

} else if (key->margin == GPKEY_RMARGIN && rmargin.x < 0) {

more = key_col_wth * key_cols;

if (plot_bounds.xright - more < plot_bounds.xleft)

key_panic = TRUE;

else

plot_bounds.xright -= more;

}

/* warn if we had to punt on key size calculations */

if (key_panic)

int_warn(NO_CARET, "Warning - difficulty fitting plot titles into key");

/*}}} */

}

/*{{{ set up y and y2 tics */

setup_tics(FIRST_Y_AXIS, 20);

setup_tics(SECOND_Y_AXIS, 20);

/*}}} */

/* Adjust color axis limits if necessary. */

if (is_plot_with_palette()) {

set_cbminmax();

axis_checked_extend_empty_range(COLOR_AXIS, "All points of color axis undefined.");

setup_tics(COLOR_AXIS, 20);

}

/*{{{ recompute plot_bounds.xleft based on widths of ytics, ylabel etc

unless it has been explicitly set by lmargin */

/* tic labels */

shift_labels_to_border = FALSE;

if (axis_array[FIRST_Y_AXIS].ticmode & TICS_ON_AXIS) {

/* FIXME: This test for how close the axis is to the border does not match */

/* the tests in axis_output_tics(), and assumes FIRST_X_AXIS. */

if (!inrange(0.0, axis_array[FIRST_X_AXIS].min, axis_array[FIRST_X_AXIS].max))

shift_labels_to_border = TRUE;

if (0.1 > fabs( axis_array[FIRST_X_AXIS].min

/ (axis_array[FIRST_X_AXIS].max - axis_array[FIRST_X_AXIS].min)))

shift_labels_to_border = TRUE;

}

if ((axis_array[FIRST_Y_AXIS].ticmode & TICS_ON_BORDER)

|| shift_labels_to_border) {

if (vertical_ytics)

/* HBB: we will later add some white space as part of this, so

* reserve two more rows (one above, one below the text ...).

* Same will be done to similar calc.'s elsewhere */

ytic_textwidth = (int) (t->v_char * (yticlin + 2));

else {

widest_tic_strlen = 0; /* reset the global variable ... */

/* get gen_tics to call widest_tic_callback with all labels

* the latter sets widest_tic_strlen to the length of the widest

* one ought to consider tics on axis if axis near border...

gen_tics(FIRST_Y_AXIS, /* 0, */ widest_tic_callback);

ytic_textwidth = (int) (t->h_char * (widest_tic_strlen + 2));

}

} else {

ytic_textwidth = 0;

}

/* tics */

if (!axis_array[FIRST_Y_AXIS].tic_in

&& ((axis_array[FIRST_Y_AXIS].ticmode & TICS_ON_BORDER)

|| ((axis_array[SECOND_Y_AXIS].ticmode & TICS_MIRROR)

&& (axis_array[SECOND_Y_AXIS].ticmode & TICS_ON_BORDER))))

ytic_width = (int) (t->h_tic * axis_array[FIRST_Y_AXIS].ticscale);

else

ytic_width = 0;

/* ylabel */

if (axis_array[FIRST_Y_AXIS].label.text && can_rotate) {

double tmpx, tmpy;

map_position_r(&(axis_array[FIRST_Y_AXIS].label.offset),

&tmpx, &tmpy, "boundary");

ylabel_textwidth = (int) (ylablin * (t->v_char) - tmpx);

if (!axis_array[FIRST_Y_AXIS].ticmode)

ylabel_textwidth += 0.5 * t->v_char;

} else

/* this should get large for NEGATIVE ylabel.xoffsets DBT 11-5-98 */

ylabel_textwidth = 0;

/* timestamp */

if (timelabel.text && vertical_timelabel) {

double tmpx, tmpy;

map_position_r(&(timelabel.offset), &tmpx, &tmpy, "boundary");

timelabel_textwidth = (int) ((timelin + 1.5) * t->v_char - tmpx);

} else

timelabel_textwidth = 0;

if (lmargin.x < 0) {

/* Auto-calculation */

double tmpx, tmpy;

plot_bounds.xleft += (timelabel_textwidth > ylabel_textwidth

? timelabel_textwidth : ylabel_textwidth)

+ ytic_width + ytic_textwidth;

/* make sure plot_bounds.xleft is wide enough for a negatively

* x-offset horizontal timestamp

map_position_r(&(timelabel.offset), &tmpx, &tmpy, "boundary");

if (!vertical_timelabel

&& plot_bounds.xleft - ytic_width - ytic_textwidth < -(int) (tmpx))

plot_bounds.xleft = ytic_width + ytic_textwidth - (int) (tmpx);

if (plot_bounds.xleft == (int) (t->xmax * xoffset)) {

/* make room for end of xtic or x2tic label */

plot_bounds.xleft += (int) (t->h_char * 2);

}

/* DBT 12-3-98 extra margin just in case */

plot_bounds.xleft += 0.5 * t->h_char;

}

/* Note: we took care of explicit 'set lmargin foo' at line 492 */

/* end of plot_bounds.xleft calculation }}} */

/*{{{ recompute plot_bounds.xright based on widest y2tic. y2labels, key "outside"

unless it has been explicitly set by rmargin */

/* tic labels */

if (axis_array[SECOND_Y_AXIS].ticmode & TICS_ON_BORDER) {

if (vertical_y2tics)

y2tic_textwidth = (int) (t->v_char * (y2ticlin + 2));

else {

widest_tic_strlen = 0; /* reset the global variable ... */

/* get gen_tics to call widest_tic_callback with all labels

* the latter sets widest_tic_strlen to the length of the widest

* one ought to consider tics on axis if axis near border...

gen_tics(SECOND_Y_AXIS, /* 0, */ widest_tic_callback);

y2tic_textwidth = (int) (t->h_char * (widest_tic_strlen + 2));

}

} else {

y2tic_textwidth = 0;

}

/* EAM May 2009

* Check to see if any xtic labels are so long that they extend beyond

* the right boundary of the plot. If so, allow extra room in the margin.

* If the labels are too long to fit even with a big margin, too bad.

if (axis_array[FIRST_X_AXIS].ticdef.def.user) {

struct ticmark *tic = axis_array[FIRST_X_AXIS].ticdef.def.user;

int maxrightlabel = plot_bounds.xright;

while (tic) {

if (tic->label) {

double xx;

int length = estimate_strlen(tic->label)

* cos(DEG2RAD * (double)(axis_array[FIRST_X_AXIS].tic_rotate))

* term->h_char;

/* We don't really know the plot layout yet, but try for an estimate */

AXIS_SETSCALE(FIRST_X_AXIS, plot_bounds.xleft, plot_bounds.xright);

axis_set_graphical_range(FIRST_X_AXIS, plot_bounds.xleft, plot_bounds.xright);

xx = axis_log_value_checked(FIRST_X_AXIS, tic->position, "xtic");

xx = AXIS_MAP(FIRST_X_AXIS, xx);

xx += (axis_array[FIRST_X_AXIS].tic_rotate) ? length : length /2;

if (maxrightlabel < xx)

maxrightlabel = xx;

}

tic = tic->next;

}

xtic_textwidth = maxrightlabel - plot_bounds.xright;

if (xtic_textwidth > term->xmax/2) {

xtic_textwidth = term->xmax/2;

int_warn(NO_CARET, "difficulty making room for xtic labels");

}

/* tics */

if (!axis_array[SECOND_Y_AXIS].tic_in

&& ((axis_array[SECOND_Y_AXIS].ticmode & TICS_ON_BORDER)

|| ((axis_array[FIRST_Y_AXIS].ticmode & TICS_MIRROR)

&& (axis_array[FIRST_Y_AXIS].ticmode & TICS_ON_BORDER))))

y2tic_width = (int) (t->h_tic * axis_array[SECOND_Y_AXIS].ticscale);

else

y2tic_width = 0;

/* y2label */

if (can_rotate && axis_array[SECOND_Y_AXIS].label.text) {

double tmpx, tmpy;

map_position_r(&(axis_array[SECOND_Y_AXIS].label.offset),

&tmpx, &tmpy, "boundary");

y2label_textwidth = (int) (y2lablin * t->v_char + tmpx);

if (!axis_array[SECOND_Y_AXIS].ticmode)

y2label_textwidth += 0.5 * t->v_char;

} else

y2label_textwidth = 0;

/* Make room for the color box if needed. */

if (rmargin.scalex != screen) {

if (is_plot_with_colorbox()) {

#define COLORBOX_SCALE 0.125

#define WIDEST_COLORBOX_TICTEXT 3

if ((color_box.where != SMCOLOR_BOX_NO) && (color_box.where != SMCOLOR_BOX_USER)) {

plot_bounds.xright -= (int) (plot_bounds.xright-plot_bounds.xleft)*COLORBOX_SCALE;

plot_bounds.xright -= (int) ((t->h_char) * WIDEST_COLORBOX_TICTEXT);

}

if (rmargin.x < 0) {

plot_bounds.xright -= y2tic_width + y2tic_textwidth;

if (y2label_textwidth > 0)

plot_bounds.xright -= y2label_textwidth;

if (plot_bounds.xright == (int) (0.5 + (t->xmax - 1) * (xsize + xoffset))) {

/* make room for end of xtic or x2tic label */

plot_bounds.xright -= (int) (t->h_char * 2);

}

/* EAM 2009 - protruding xtic labels */

if (term->xmax - plot_bounds.xright < xtic_textwidth)

plot_bounds.xright = term->xmax - xtic_textwidth;

/* DBT 12-3-98 extra margin just in case */

plot_bounds.xright -= 0.5 * t->h_char;

}

/* Note: we took care of explicit 'set rmargin foo' at line 502 */

}

/* end of plot_bounds.xright calculation }}} */

/*{{{ 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

/* HBB 20001205: moved this block to before aspect_ratio is

* applied: setup_tics may extend the ranges, which would distort

* the aspect ratio */

setup_tics(FIRST_X_AXIS, 20);

setup_tics(SECOND_X_AXIS, 20);

/* Modify the bounding box to fit the aspect ratio, if any was

* given. */

if (aspect_ratio != 0.0) {

double current_aspect_ratio;

if (aspect_ratio < 0

&& (X_AXIS.max - X_AXIS.min) != 0.0

) {

current_aspect_ratio = - aspect_ratio

* fabs((Y_AXIS.max - Y_AXIS.min) / (X_AXIS.max - X_AXIS.min));

} else

current_aspect_ratio = aspect_ratio;

/* Set aspect ratio if valid and sensible */

/* EAM Mar 2008 - fixed borders take precedence over centering */

if (current_aspect_ratio >= 0.01 && current_aspect_ratio <= 100.0) {

double current = ((double) (plot_bounds.ytop - plot_bounds.ybot))

/ (plot_bounds.xright - plot_bounds.xleft);

double required = (current_aspect_ratio * t->v_tic) / t->h_tic;

if (current > required) {

/* too tall */

int old_height = plot_bounds.ytop - plot_bounds.ybot;

int new_height = required * (plot_bounds.xright - plot_bounds.xleft);

if (bmargin.scalex == screen)

plot_bounds.ytop = plot_bounds.ybot + new_height;

else if (tmargin.scalex == screen)

plot_bounds.ybot = plot_bounds.ytop - new_height;

else {

plot_bounds.ybot += (old_height - new_height) / 2;

plot_bounds.ytop -= (old_height - new_height) / 2;

}

} else {

int old_width = plot_bounds.xright - plot_bounds.xleft;

int new_width = (plot_bounds.ytop - plot_bounds.ybot) / required;

if (lmargin.scalex == screen)

plot_bounds.xright = plot_bounds.xleft + new_width;

else if (rmargin.scalex == screen)

plot_bounds.xleft = plot_bounds.xright - new_width;

else {

View remainder of file in raw view

gnuplot-old/src/graphics.c at gnuplot-4-4-alpha · gnuplot/gnuplot-old · GitHub

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