gnuplot/src/boundary.c at 5.5 · gnuplot/gnuplot · GitHub

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/* GNUPLOT - boundary.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 "graphics.h"

#include "boundary.h"

#include "alloc.h"

#include "axis.h"

#include "misc.h"

#include "plot2d.h"

#include "pm3d.h" /* for is_plot_with_palette */

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

/*{{{ local variables */

static int xlablin, x2lablin, ylablin, y2lablin, titlelin, xticlin, x2ticlin;

/*{{{ local and global variables */

static int key_sample_width; /* width of line sample */

static int key_sample_height; /* sample itself; does not scale with "set key spacing" */

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_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 key_xleft; /* Amount of space on the left required by the key */

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

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

static int key_width; /* calculate once, then everyone uses it */

static int key_height; /* ditto */

static int key_title_height; /* nominal number of lines * character height */

static int key_title_extra; /* allow room for subscript/superscript */

static int key_title_ypos; /* offset from key->bounds.ytop */

static int time_y, time_x;

int title_x, title_y; /* Used by boundary and by 2D graphics */

* These quantities are needed in do_plot() e.g. for histogtram title layout

int key_entry_height; /* bigger of t->v_char, t->v_tic */

int key_point_offset; /* offset from x for point sample */

int ylabel_x, y2label_x, xlabel_y, x2label_y;

int x2label_yoffset;

int ylabel_y, y2label_y, xtic_y, x2tic_y, ytic_x, y2tic_x;

int key_rows;

int key_cols;

int key_count;

static int key_col_wth, yl_ref;

static int xl, yl;

/*{{{ boundary() */

/* borders of plotting area

* computed once on every call to do_plot

* The order in which things are done has become critical:

* plot_bounds.ytop depends on title, x2label

* 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

void

boundary(struct curve_points *plots, int count)

{

int yticlin = 0, y2ticlin = 0;

legend_key *key = &keyT;

struct termentry *t = term;

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

int xtic_textheight=0; /* height of xtic labels */

int x2tic_textheight=0; /* height of x2tic labels */

int title_textheight=0; /* height of title */

int xlabel_textheight=0; /* height of xlabel */

int x2label_textheight=0; /* height of x2label */

int ylabel_textwidth=0; /* width of (rotated) ylabel */

int y2label_textwidth=0; /* width of (rotated) y2label */

int timelabel_textwidth=0; /* width of timestamp */

int timelabel_textheight=0; /* height of timestamp */

int ytic_textwidth=0; /* width of ytic labels */

int y2tic_textwidth=0; /* width of y2tic labels */

int x2tic_height=0; /* 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=0;

int ytic_width=0;

int y2tic_width=0;

int ttic_textheight=0; /* vertical clearance for ttics */

/* 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;

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);

/*}}} */

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

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

/* Title placement has been reworked for 5.4

* NOTE: title_textheight is _not_ the height of the title!

* It is the amount of space reserved for the title above the plot.

* A negative offset greater than the number of title lines means

* that the title will appear inside the boundary and no extra space

* needs to be reserved for it above the plot.

title_textheight = 0;

if (titlelin) {

title_textheight = t->v_char; /* Gap of one normal line height */

if (title.font)

t->set_font(title.font);

title_y = titlelin * t->v_char;

if ((titlelin + title.offset.y) > 0)

title_textheight += titlelin * t->v_char;

if (title.font)

t->set_font("");

title_y += 0.5 * t->v_char; /* Approximate same placement as version 5.2 */

}

/* Extra space at the top for spiderplot axis label */

if (spiderplot)

title_textheight += 1.5 * t->v_char;

/* x2label */

if (x2lablin) {

double tmpx, tmpy;

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

&tmpx, &tmpy, "x2label");

if (axis_array[SECOND_X_AXIS].label.font)

t->set_font(axis_array[SECOND_X_AXIS].label.font);

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

x2label_yoffset = tmpy;

if (axis_array[SECOND_X_AXIS].label.font)

t->set_font("");

} 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 */

x2tic_textheight = (int) (x2ticlin * t->v_char);

} else

x2tic_textheight = 0;

/* tics */

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

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

if (axis_array[SECOND_X_AXIS].tic_in)

x2tic_height = -x2tic_height;

} else

x2tic_height = 0;

/* Polar (theta) tic labels need space at top and bottom of plot */

if (THETA_AXIS.ticmode) {

/* FIXME: Really 5% of polar grid radius, but we don't know that yet */

ttic_textheight = 2. * t->v_char;

}

/* timestamp */

if (timelabel.text) {

int timelin;

timelabel_textwidth = label_width(timelabel.text, &timelin);

if (vertical_timelabel) {

timelabel_textheight = timelabel_textwidth * t->v_char;

timelabel_textwidth = (timelin + 1.5) * t->h_char;

timelabel.place.y = 0;

} else {

timelabel_textheight = timelin * t->v_char;

timelabel_textwidth = timelabel_textwidth * t->h_char;

/* save textheight for use in do_key_bounds() */

timelabel.place.y = timelabel_textheight;

}

/* ylabel placement */

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

if (can_rotate && axis_array[FIRST_Y_AXIS].label.rotate != 0) {

ylabel_textwidth = ylablin * t->v_char;

} else {

/* Trying to estimate this length caused more problems than it solved.

* For one thing it comes out wrong for text passed to TeX terminals.

* Assume the common case is roughly 3 character widths and let the

* user adjust lmargin and offset for longer non-rotated ylabels.

ylabel_textwidth = 3 * t->h_char;

}

/* y2label placement */

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

if (can_rotate && axis_array[SECOND_Y_AXIS].label.rotate != 0) {

y2label_textwidth = y2lablin * t->v_char;

if (!axis_array[SECOND_Y_AXIS].ticmode)

y2label_textwidth += 0.5 * t->v_char;

} else {

/* See above. Estimating true text length causes problems */

y2label_textwidth = 3 * t->h_char;

}

/* compute plot_bounds.ytop from the various components

* unless tmargin is explicitly specified

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

/* Sanity check top and bottom margins, in case the user got confused */

if (bmargin.scalex == screen && tmargin.scalex == screen)

if (bmargin.x > tmargin.x) {

double tmp = bmargin.x;

bmargin.x = tmargin.x;

tmargin.x = tmp;

}

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 = title_textheight;

if (x2label_textheight + x2label_yoffset > 0)

top_margin += x2label_textheight;

if (timelabel_textheight > top_margin && !timelabel_bottom && !vertical_timelabel)

top_margin = timelabel_textheight;

top_margin += x2tic_textheight;

top_margin += t->v_char;

if (x2tic_height > 0)

top_margin += x2tic_height;

top_margin += ttic_textheight;

plot_bounds.ytop -= top_margin;

if (plot_bounds.ytop == (int)(0.5 + (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) {

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;

/* 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 (!vertical_timelabel && timelabel_bottom && timelabel_textheight > 0)

plot_bounds.ybot += timelabel_textheight;

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);

}

if (spiderplot) /* Extra space at the bottom for spiderplot axis label */

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

/* Last chance for better estimate of space required for ttic labels */

/* It is too late to go back and adjust positions relative to ytop */

if (ttic_textheight > 0) {

ttic_textheight = 0.05 * (plot_bounds.ytop - plot_bounds.ybot);

plot_bounds.ybot += ttic_textheight;

}

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

/* Determine the size and position of the key box */

if (key->visible) {

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

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

do_key_layout(key);

}

/* Adjust range of dependent axes y and y2 */

if (nonlinear(&axis_array[FIRST_Y_AXIS]))

extend_primary_ticrange(&axis_array[FIRST_Y_AXIS]);

if (nonlinear(&axis_array[SECOND_Y_AXIS]))

extend_primary_ticrange(&axis_array[SECOND_Y_AXIS]);

setup_tics(&axis_array[FIRST_Y_AXIS], 20);

setup_tics(&axis_array[SECOND_Y_AXIS], 20);

/* Adjust color axis limits if necessary. */

if (is_plot_with_palette()) {

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

if (color_box.where != SMCOLOR_BOX_NO)

setup_tics(&axis_array[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(&axis_array[FIRST_Y_AXIS], widest_tic_callback);

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

}

} else if (axis_array[FIRST_Y_AXIS].label.text) {

/* substitutes for extra space added to left of ytix labels */

ytic_textwidth = 2 * (t->h_char);

} 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;

if (lmargin.x < 0) {

/* Auto-calculation */

int space_to_left = key_xleft;

if (space_to_left < timelabel_textwidth && vertical_timelabel)

space_to_left = timelabel_textwidth;

if (space_to_left < ylabel_textwidth)

space_to_left = ylabel_textwidth;

plot_bounds.xleft = xoffset * t->xmax;

plot_bounds.xleft += space_to_left;

plot_bounds.xleft += ytic_width + ytic_textwidth;

if (plot_bounds.xleft - ytic_width - ytic_textwidth < 0)

plot_bounds.xleft = ytic_width + ytic_textwidth;

if (plot_bounds.xleft < t->xmax * xoffset + t->h_char * 2)

plot_bounds.xleft = t->xmax * xoffset + 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(&axis_array[SECOND_Y_AXIS], 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;

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

axis_set_scale_and_range(&axis_array[FIRST_X_AXIS], plot_bounds.xleft, plot_bounds.xright);

while (tic) {

if (tic->label) {

double xx;

int length = estimate_strlen(tic->label, NULL)

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

* term->h_char;

if (inrange(tic->position,

axis_array[FIRST_X_AXIS].set_min,

axis_array[FIRST_X_AXIS].set_max)) {

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

xx = map_x(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/4) {

xtic_textwidth = term->xmax/4;

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;

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

if (rmargin.scalex != screen) {

if (is_plot_with_colorbox()) {

#define COLORBOX_SCALE 0.100

#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);

}

color_box.xoffset = 0;

}

if (rmargin.x < 0) {

color_box.xoffset = plot_bounds.xright;

plot_bounds.xright -= y2tic_width + y2tic_textwidth;

if (y2label_textwidth > 0)

plot_bounds.xright -= y2label_textwidth;

if (plot_bounds.xright > (xsize+xoffset)*(t->xmax-1) - (t->h_char * 2))

plot_bounds.xright = (xsize+xoffset)*(t->xmax-1) - (t->h_char * 2);

color_box.xoffset -= plot_bounds.xright;

/* 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 -= 1.0 * 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

setup_tics(&axis_array[FIRST_X_AXIS], 20);

setup_tics(&axis_array[SECOND_X_AXIS], 20);

/* Make sure that if polar grid is shown on a cartesian axis plot */

/* the rtics match up with the primary x tics. */

if (R_AXIS.ticmode && (polar || raxis)) {

if (bad_axis_range(&R_AXIS) || (!polar && R_AXIS.min != 0)) {

set_explicit_range(&R_AXIS, 0.0, X_AXIS.max);

R_AXIS.min = 0;

R_AXIS.max = axis_array[FIRST_X_AXIS].max;

int_warn(NO_CARET, "resetting rrange");

}

setup_tics(&axis_array[POLAR_AXIS], 10);

/* If setup_tics extends rrange to next tic then the previous

* x/y range limits from polar_range_fiddling are out of date.

polar_range_fiddling(&axis_array[FIRST_X_AXIS], &axis_array[FIRST_Y_AXIS]);

}

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

if (aspect_ratio != 0.0) {

double current_aspect_ratio;

double current, required;

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;

if (current_aspect_ratio < 0.005 || current_aspect_ratio > 2000.0)

int_warn(NO_CARET, "extreme aspect ratio");

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

/ ((double) (plot_bounds.xright - plot_bounds.xleft));

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

/* Fixed borders take precedence over centering */

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 {

/* too wide */

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 {

plot_bounds.xleft += (old_width - new_width) / 2;

plot_bounds.xright -= (old_width - new_width) / 2;

}

/* Calculate space needed for tic label rotation.

* If [tb]margin is auto, move the plot boundary.

* Otherwise use textheight to adjust placement of various titles.

if (axis_array[SECOND_X_AXIS].ticmode & TICS_ON_BORDER && vertical_x2tics) {

/* Assuming left justified tic labels. Correction below if they aren't */

double projection = sin((double)axis_array[SECOND_X_AXIS].tic_rotate*DEG2RAD);

if (axis_array[SECOND_X_AXIS].tic_pos == RIGHT)

projection *= -1;

else if (axis_array[SECOND_X_AXIS].tic_pos == CENTRE)

projection = 0.5*fabs(projection);

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

gen_tics(&axis_array[SECOND_X_AXIS], widest_tic_callback);

if (tmargin.x < 0) /* Undo original estimate */

plot_bounds.ytop += x2tic_textheight;

/* Adjust spacing for rotation */

if (projection > 0.0)

x2tic_textheight += (int) (t->h_char * (widest_tic_strlen)) * projection;

if (tmargin.x < 0)

plot_bounds.ytop -= x2tic_textheight;

}

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

double projection;

/* This adjustment will happen again in axis_output_tics but we need it now */

if (axis_array[FIRST_X_AXIS].tic_rotate == TEXT_VERTICAL

&& !axis_array[FIRST_X_AXIS].manual_justify)

axis_array[FIRST_X_AXIS].tic_pos = RIGHT;

if (axis_array[FIRST_X_AXIS].tic_rotate == 90)

projection = -1.0;

else if (axis_array[FIRST_X_AXIS].tic_rotate == TEXT_VERTICAL)

projection = -1.0;

else

projection = -sin((double)axis_array[FIRST_X_AXIS].tic_rotate*DEG2RAD);

if (axis_array[FIRST_X_AXIS].tic_pos == RIGHT)

projection *= -1;

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

gen_tics(&axis_array[FIRST_X_AXIS], widest_tic_callback);

if (bmargin.x < 0)

plot_bounds.ybot -= xtic_textheight;

if (projection > 0.0)

xtic_textheight = (int) (t->h_char * widest_tic_strlen) * projection

+ t->v_char;

if (bmargin.x < 0)

plot_bounds.ybot += xtic_textheight;

}

* Notwithstanding all these fancy calculations,

* plot_bounds.ytop must always be above plot_bounds.ybot

if (plot_bounds.ytop < plot_bounds.ybot) {

int i = plot_bounds.ytop;

plot_bounds.ytop = plot_bounds.ybot;

plot_bounds.ybot = i;

FPRINTF((stderr,"boundary: Big problems! plot_bounds.ybot > plot_bounds.ytop\n"));

}

/* compute coordinates for axis labels, title etc */

x2label_y = plot_bounds.ytop + x2label_textheight;

x2label_y += 0.5 * t->v_char;

if (x2label_textheight + x2label_yoffset >= 0) {

x2label_y += 1.5 * x2tic_textheight;

/* Adjust for the tics themselves */

if (x2tic_height > 0)

x2label_y += x2tic_height;

}

title_x = (plot_bounds.xleft + plot_bounds.xright) / 2;

/* title_y was previously set to the actual title height.

* Further corrections to this placement only if it is above the plot

title_y += plot_bounds.ytop;

if (titlelin + title.offset.y > 0) {

title_y += x2tic_textheight;

title_y += ttic_textheight;

if (x2label_y + x2label_yoffset > plot_bounds.ytop)

title_y += x2label_textheight;

if (x2tic_height > 0)

title_y += x2tic_height;

}

/* Shift upward by 0.2 line to allow for descenders in xlabel text */

xlabel_y = plot_bounds.ybot - xtic_height - xtic_textheight - xlabel_textheight

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

xlabel_y -= ttic_textheight;

ylabel_x = plot_bounds.xleft - ytic_width - ytic_textwidth;

ylabel_x -= ylabel_textwidth/2;

y2label_x = plot_bounds.xright + y2tic_width + y2tic_textwidth;

y2label_x += y2label_textwidth/2;

/* Nov 2016 - simplify placement of timestamp

* Stamp the same place on the page regardless of plot margins

if (vertical_timelabel) {

time_x = 1.5 * term->h_char;

if (timelabel_bottom)

time_y = term->v_char;

else

time_y = term->ymax - term->v_char;

} else {

time_x = 1.0 * term->h_char;

if (timelabel_bottom)

time_y = timelabel_textheight - 0.5 * term->v_char;

else

time_y = term->ymax;

}

xtic_y = plot_bounds.ybot - xtic_height

- (int) (vertical_xtics ? t->h_char : t->v_char);

x2tic_y = plot_bounds.ytop + (x2tic_height > 0 ? x2tic_height : 0)

+ (vertical_x2tics ? (int) t->h_char : t->v_char);

ytic_x = plot_bounds.xleft - ytic_width

- (vertical_ytics

? (ytic_textwidth - (int) t->v_char)

: (int) t->h_char);

y2tic_x = plot_bounds.xright + y2tic_width

+ (int) (vertical_y2tics ? t->v_char : t->h_char);

/* restore text to horizontal [we tested rotation above] */

(void) (*t->text_angle) (0);

/* needed for map_position() below */

axis_set_scale_and_range(&axis_array[FIRST_X_AXIS], plot_bounds.xleft, plot_bounds.xright);

axis_set_scale_and_range(&axis_array[SECOND_X_AXIS], plot_bounds.xleft, plot_bounds.xright);

axis_set_scale_and_range(&axis_array[FIRST_Y_AXIS], plot_bounds.ybot, plot_bounds.ytop);

axis_set_scale_and_range(&axis_array[SECOND_Y_AXIS], plot_bounds.ybot, plot_bounds.ytop);

/* Calculate limiting bounds of the key */

do_key_bounds(key);

/* Set default clipping to the plot boundary */

clip_area = &plot_bounds;

/* Sanity checks */

if (plot_bounds.xright < plot_bounds.xleft

|| plot_bounds.ytop < plot_bounds.ybot)

int_warn(NO_CARET, "Terminal canvas area too small to hold plot."

"\n\t Check plot boundary and font sizes.");

}

/*}}} */

void

do_key_bounds(legend_key *key)

{

struct termentry *t = term;

double dx, dy;

key_height = key_title_height + key_title_extra

+ key_rows * key_entry_height + key->height_fix * key_entry_height;

if (key->user_width.x == 0)

key_width = key_col_wth * key_cols;

if (key->user_width.x > 0) {

if (key->user_width.scalex == screen)

key_width = key->user_width.x * (double)(t->xmax-1);

else if (key->user_width.scalex == graph)

key_width = key->user_width.x * (plot_bounds.xright - plot_bounds.xleft);

}

/* Key inside plot boundaries */

if (key->region == GPKEY_AUTO_INTERIOR_LRTBC

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

if (key->vpos == JUST_TOP) {

key->bounds.ytop = plot_bounds.ytop - t->v_tic;

key->bounds.ybot = key->bounds.ytop - key_height;

} else if (key->vpos == JUST_BOT) {

key->bounds.ybot = plot_bounds.ybot + t->v_tic;

key->bounds.ytop = key->bounds.ybot + key_height;

} else /* (key->vpos == JUST_CENTRE) */ {

key->bounds.ybot = ((plot_bounds.ybot + plot_bounds.ytop) - key_height) / 2;

key->bounds.ytop = ((plot_bounds.ybot + plot_bounds.ytop) + key_height) / 2;

}

if (key->hpos == LEFT) {

key->bounds.xleft = plot_bounds.xleft + t->h_char;

key->bounds.xright = key->bounds.xleft + key_width;

} else if (key->hpos == RIGHT) {

key->bounds.xright = plot_bounds.xright - t->h_char;

key->bounds.xleft = key->bounds.xright - key_width;

} else /* (key->hpos == CENTER) */ {

key->bounds.xleft = ((plot_bounds.xright + plot_bounds.xleft) - key_width) / 2;

key->bounds.xright = ((plot_bounds.xright + plot_bounds.xleft) + key_width) / 2;

}

/* Key outside plot boundaries */

} else if (key->region == GPKEY_AUTO_EXTERIOR_LRTBC || key->region == GPKEY_AUTO_EXTERIOR_MARGIN) {

/* Vertical alignment */

if (key->margin == GPKEY_TMARGIN) {

/* align top first since tmargin may be manual */

key->bounds.ytop = (ysize + yoffset) * t->ymax - t->v_tic;

key->bounds.ybot = key->bounds.ytop - key_height;

} else if (key->margin == GPKEY_BMARGIN) {

/* align bottom first since bmargin may be manual */

key->bounds.ybot = yoffset * t->ymax + t->v_tic;

if (timelabel.rotate == 0 && timelabel_bottom && timelabel.place.y > 0)

key->bounds.ybot += (int)(timelabel.place.y);

key->bounds.ytop = key->bounds.ybot + key_height;

} else {

if (key->vpos == JUST_TOP) {

/* align top first since tmargin may be manual */

key->bounds.ytop = plot_bounds.ytop;

key->bounds.ybot = key->bounds.ytop - key_height;

} else if (key->vpos == JUST_CENTRE) {

key->bounds.ybot = ((plot_bounds.ybot + plot_bounds.ytop) - key_height) / 2;

key->bounds.ytop = ((plot_bounds.ybot + plot_bounds.ytop) + key_height) / 2;

} else {

/* align bottom first since bmargin may be manual */

key->bounds.ybot = plot_bounds.ybot;

key->bounds.ytop = key->bounds.ybot + key_height;

}

/* Horizontal alignment */

if (key->margin == GPKEY_LMARGIN) {

/* align left first since lmargin may be manual */

key->bounds.xleft = xoffset * t->xmax + t->h_char;

key->bounds.xright = key->bounds.xleft + key_width;

} else if (key->margin == GPKEY_RMARGIN) {

/* align right first since rmargin may be manual */

key->bounds.xright = (xsize + xoffset) * (t->xmax-1) - t->h_char;

key->bounds.xleft = key->bounds.xright - key_width;

} else {

if (key->hpos == LEFT) {

/* align left first since lmargin may be manual */

key->bounds.xleft = plot_bounds.xleft;

key->bounds.xright = key->bounds.xleft + key_width;

} else if (key->hpos == CENTRE) {

key->bounds.xleft = ((plot_bounds.xright + plot_bounds.xleft) - key_width) / 2;

key->bounds.xright = ((plot_bounds.xright + plot_bounds.xleft) + key_width) / 2;

} else {

/* align right first since rmargin may be manual */

key->bounds.xright = plot_bounds.xright;

key->bounds.xleft = key->bounds.xright - key_width;

}

/* Key at explicit position specified by user */

} else {

int x, y;

/* FIXME!!!

* pm 22.1.2002: if key->user_pos.scalex or scaley == first_axes or second_axes,

* then the graph scaling is not yet known and the box is positioned incorrectly;

* you must do "replot" to avoid the wrong plot ... bad luck if output does not

* go to screen

map_position(&key->user_pos, &x, &y, "key");

/* Here top, bottom, left, right refer to the alignment with respect to point. */

key->bounds.xleft = x;

if (key->hpos == CENTRE)

key->bounds.xleft -= key_width/2;

else if (key->hpos == RIGHT)

key->bounds.xleft -= key_width;

key->bounds.xright = key->bounds.xleft + key_width;

key->bounds.ytop = y;

if (key->vpos == JUST_CENTRE)

key->bounds.ytop += key_height/2;

else if (key->vpos == JUST_BOT)

key->bounds.ytop += key_height;

key->bounds.ybot = key->bounds.ytop - key_height;

}

/* Regardless of how the key was nominally positioned,

* the result can be manually tweaked by "set key offset dx, dy"

map_position_r(&key->offset, &dx, &dy, "key");

key->bounds.ytop += dy;

key->bounds.ybot += dy;

key->bounds.xleft += dx;

key->bounds.xright += dx;

}

/* Calculate positioning of components that make up the key box */

void

do_key_layout(legend_key *key)

{

struct termentry *t = term;

TBOOLEAN key_panic = FALSE;

/* If there is a separate font for the key, use it for space calculations. */

if (key->font)

t->set_font(key->font);

/* Is it OK to initialize these here rather than in do_plot? */

key_count = 0;

key_xleft = 0;

xl = yl = 0;

if (key->swidth >= 0) {

key_sample_width = key->swidth * t->h_char + t->h_tic;

} else {

key_sample_width = 0;

}

key_sample_height = GPMAX( 1.25 * t->v_tic, t->v_char );

key_entry_height = key_sample_height * key->vert_factor;

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

View remainder of file in raw view

gnuplot/src/boundary.c at 5.5 · gnuplot/gnuplot · GitHub

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