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#ifndef lint
static char *RCSid() { return RCSid("$Id: gadgets.c,v 1.80.2.2 2014/05/03 03:51:08 sfeam Exp $"); }
#endif
/* GNUPLOT - gadgets.c */
/*[
* Copyright 2000, 2004 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 "gadgets.h"
#include "command.h"
#include "graph3d.h" /* for map3d_position_r() */
#include "graphics.h"
#include "plot3d.h" /* For is_plot_with_palette() */
#include "pm3d.h"
/* This file contains mainly a collection of global variables that
* used to be in 'set.c', where they didn't really belong. They
* describe the status of several parts of the gnuplot plotting engine
* that are used by both 2D and 3D plots, and thus belong neither to
* graphics.c nor graph3d.c, alone. This is not a very clean solution,
* but better than mixing internal status and the user interface as we
* used to have it, in set.c and setshow.h */
legend_key keyT = DEFAULT_KEY_PROPS;
/* Description of the color box associated with CB_AXIS */
color_box_struct color_box; /* initialized in init_color() */
color_box_struct default_color_box = {SMCOLOR_BOX_DEFAULT, 'v', 1, LT_BLACK, LAYER_FRONT, 0,
{screen, screen, screen, 0.90, 0.2, 0.0},
{screen, screen, screen, 0.05, 0.6, 0.0},
{0,0,0,0} };
/* The graph box, in terminal coordinates, as calculated by boundary()
* or boundary3d(): */
BoundingBox plot_bounds;
/* The bounding box for the entire drawable area of current terminal */
BoundingBox canvas;
/* The bounding box against which clipping is to be done */
BoundingBox *clip_area = &plot_bounds;
/* 'set size', 'set origin' setttings */
float xsize = 1.0; /* scale factor for size */
float ysize = 1.0; /* scale factor for size */
float zsize = 1.0; /* scale factor for size */
float xoffset = 0.0; /* x origin */
float yoffset = 0.0; /* y origin */
float aspect_ratio = 0.0; /* don't attempt to force it */
int aspect_ratio_3D = 0; /* 2 will put x and y on same scale, 3 for z also */
/* EAM Augest 2006 -
redefine margin as t_position so that absolute placement is possible */
/* space between left edge and plot_bounds.xleft in chars (-1: computed) */
t_position lmargin = DEFAULT_MARGIN_POSITION;
/* space between bottom and plot_bounds.ybot in chars (-1: computed) */
t_position bmargin = DEFAULT_MARGIN_POSITION;
/* space between right egde and plot_bounds.xright in chars (-1: computed) */
t_position rmargin = DEFAULT_MARGIN_POSITION;
/* space between top egde and plot_bounds.ytop in chars (-1: computed) */
t_position tmargin = DEFAULT_MARGIN_POSITION;
/* File descriptor for output during 'set table' mode */
FILE *table_outfile = NULL;
TBOOLEAN table_mode = FALSE;
/* Pointer to the start of the linked list of 'set label' definitions */
struct text_label *first_label = NULL;
/* Pointer to first 'set linestyle' definition in linked list */
struct linestyle_def *first_linestyle = NULL;
struct linestyle_def *first_perm_linestyle = NULL;
/* Pointer to first 'set style arrow' definition in linked list */
struct arrowstyle_def *first_arrowstyle = NULL;
/* set arrow */
struct arrow_def *first_arrow = NULL;
#ifdef EAM_OBJECTS
/* Pointer to first object instance in linked list */
struct object *first_object = NULL;
#endif
/* 'set title' status */
text_label title = EMPTY_LABELSTRUCT;
/* 'set timelabel' status */
text_label timelabel = EMPTY_LABELSTRUCT;
int timelabel_rotate = FALSE;
int timelabel_bottom = TRUE;
/* flag for polar mode */
TBOOLEAN polar = FALSE;
/* zero threshold, may _not_ be 0! */
double zero = ZERO;
/* Status of 'set pointsize' and 'set pointintervalbox' commands */
double pointsize = 1.0;
double pointintervalbox = 1.0;
/* set border */
int draw_border = 31; /* The current settings */
int user_border = 31; /* What the user last set explicitly */
int border_layer = 1;
# define DEFAULT_BORDER_LP { 0, LT_BLACK, 0, 0, 1.0, 1.0, FALSE, BLACK_COLORSPEC }
struct lp_style_type border_lp = DEFAULT_BORDER_LP;
const struct lp_style_type default_border_lp = DEFAULT_BORDER_LP;
const struct lp_style_type background_lp = {0, LT_BACKGROUND, 0, 0, 1.0, 0.0, FALSE, BACKGROUND_COLORSPEC};
/* set clip */
TBOOLEAN clip_lines1 = TRUE;
TBOOLEAN clip_lines2 = FALSE;
TBOOLEAN clip_points = FALSE;
/* set samples */
int samples_1 = SAMPLES;
int samples_2 = SAMPLES;
/* set angles */
double ang2rad = 1.0; /* 1 or pi/180, tracking angles_format */
enum PLOT_STYLE data_style = POINTSTYLE;
enum PLOT_STYLE func_style = LINES;
TBOOLEAN parametric = FALSE;
/* If last plot was a 3d one. */
TBOOLEAN is_3d_plot = FALSE;
#ifdef VOLATILE_REFRESH
/* Flag to signal that the existing data is valid for a quick refresh */
int refresh_ok = 0; /* 0 = no; 2 = 2D ok; 3 = 3D ok */
/* FIXME: do_plot should be able to figure this out on its own! */
int refresh_nplots = 0;
#endif
/* Flag to show that volatile input data is present */
TBOOLEAN volatile_data = FALSE;
fill_style_type default_fillstyle = { FS_EMPTY, 100, 0, DEFAULT_COLORSPEC } ;
#ifdef EAM_OBJECTS
/* Default rectangle style - background fill, black border */
struct object default_rectangle = DEFAULT_RECTANGLE_STYLE;
struct object default_circle = DEFAULT_CIRCLE_STYLE;
struct object default_ellipse = DEFAULT_ELLIPSE_STYLE;
#endif
/* filledcurves style options */
filledcurves_opts filledcurves_opts_data = EMPTY_FILLEDCURVES_OPTS;
filledcurves_opts filledcurves_opts_func = EMPTY_FILLEDCURVES_OPTS;
/* Prefer line styles over plain line types */
TBOOLEAN prefer_line_styles = FALSE;
histogram_style histogram_opts = DEFAULT_HISTOGRAM_STYLE;
boxplot_style boxplot_opts = DEFAULT_BOXPLOT_STYLE;
/* WINDOWID to be filled by terminals running on X11 (x11, wxt, qt, ...) */
int current_x11_windowid = 0;
/*****************************************************************/
/* Routines that deal with global objects defined in this module */
/*****************************************************************/
/* Clipping to the bounding box: */
/* Test a single point to be within the BoundingBox.
* Sets the returned integers 4 l.s.b. as follows:
* bit 0 if to the left of xleft.
* bit 1 if to the right of xright.
* bit 2 if below of ybot.
* bit 3 if above of ytop.
* 0 is returned if inside.
*/
int
clip_point(unsigned int x, unsigned int y)
{
int ret_val = 0;
if (!clip_area)
return 0;
if ((int)x < clip_area->xleft)
ret_val |= 0x01;
if ((int)x > clip_area->xright)
ret_val |= 0x02;
if ((int)y < clip_area->ybot)
ret_val |= 0x04;
if ((int)y > clip_area->ytop)
ret_val |= 0x08;
return ret_val;
}
/* Clip the given line to drawing coords defined by BoundingBox.
* This routine uses the cohen & sutherland bit mapping for fast clipping -
* see "Principles of Interactive Computer Graphics" Newman & Sproull page 65.
*/
void
draw_clip_line(int x1, int y1, int x2, int y2)
{
struct termentry *t = term;
if (!clip_line(&x1, &y1, &x2, &y2))
/* clip_line() returns zero --> segment completely outside
* bounding box */
return;
(*t->move) (x1, y1);
(*t->vector) (x2, y2);
}
void
draw_clip_arrow( int sx, int sy, int ex, int ey, int head)
{
struct termentry *t = term;
/* Don't draw head if the arrow itself is clipped */
if (clip_point(sx,sy))
head &= ~BACKHEAD;
if (clip_point(ex,ey))
head &= ~END_HEAD;
clip_line(&sx, &sy, &ex, &ey);
/* Call terminal routine to draw the clipped arrow */
(*t->arrow)((unsigned int)sx, (unsigned int)sy,
(unsigned int)ex, (unsigned int)ey, head);
}
/* Clip the given line to drawing coords defined by BoundingBox.
* This routine uses the cohen & sutherland bit mapping for fast clipping -
* see "Principles of Interactive Computer Graphics" Newman & Sproull page 65.
* Return 0: entire line segment is outside bounding box
* 1: entire line segment is inside bounding box
* -1: line segment has been clipped to bounding box
*/
int
clip_line(int *x1, int *y1, int *x2, int *y2)
{
/* Apr 2014: This algorithm apparently assumed infinite precision
* integer arithmetic. It was failing when passed coordinates that
* were hugely out of bounds because tests for signedness of the
* form (dx * dy > 0) would overflow rather than correctly evaluating
* to (sign(dx) == sign(dy)). Worse yet, the numerical values are
* used to determine which end of the segment to update.
* This is now addressed by making dx and dy (double) rather than (int)
* but it might be better to hard-code the sign tests.
*/
double dx, dy;
int x, y, x_intr[4], y_intr[4], count, pos1, pos2;
int x_max, x_min, y_max, y_min;
pos1 = clip_point(*x1, *y1);
pos2 = clip_point(*x2, *y2);
if (!pos1 && !pos2)
return 1; /* segment is totally in */
if (pos1 & pos2)
return 0; /* segment is totally out. */
/* Here part of the segment MAY be inside. test the intersection
* of this segment with the 4 boundaries for hopefully 2 intersections
* in. If none are found segment is totaly out.
* Under rare circumstances there may be up to 4 intersections (e.g.
* when the line passes directly through at least one corner). In
* this case it is sufficient to take any 2 intersections (e.g. the
* first two found).
*/
count = 0;
dx = *x2 - *x1;
dy = *y2 - *y1;
/* Find intersections with the x parallel bbox lines: */
if (dy != 0) {
x = (clip_area->ybot - *y2) * dx / dy + *x2; /* Test for clip_area->ybot boundary. */
if (x >= clip_area->xleft && x <= clip_area->xright) {
x_intr[count] = x;
y_intr[count++] = clip_area->ybot;
}
x = (clip_area->ytop - *y2) * dx / dy + *x2; /* Test for clip_area->ytop boundary. */
if (x >= clip_area->xleft && x <= clip_area->xright) {
x_intr[count] = x;
y_intr[count++] = clip_area->ytop;
}
}
/* Find intersections with the y parallel bbox lines: */
if (dx != 0) {
y = (clip_area->xleft - *x2) * dy / dx + *y2; /* Test for clip_area->xleft boundary. */
if (y >= clip_area->ybot && y <= clip_area->ytop) {
x_intr[count] = clip_area->xleft;
y_intr[count++] = y;
}
y = (clip_area->xright - *x2) * dy / dx + *y2; /* Test for clip_area->xright boundary. */
if (y >= clip_area->ybot && y <= clip_area->ytop) {
x_intr[count] = clip_area->xright;
y_intr[count++] = y;
}
}
if (count < 2)
return 0;
if (*x1 < *x2) {
x_min = *x1;
x_max = *x2;
} else {
x_min = *x2;
x_max = *x1;
}
if (*y1 < *y2) {
y_min = *y1;
y_max = *y2;
} else {
y_min = *y2;
y_max = *y1;
}
if (pos1 && pos2) { /* Both were out - update both */
/* EAM Sep 2008 - preserve direction of line segment */
if ((dx*(x_intr[1]-x_intr[0]) < 0)
|| (dy*(y_intr[1]-y_intr[0]) < 0)) {
*x1 = x_intr[1];
*y1 = y_intr[1];
*x2 = x_intr[0];
*y2 = y_intr[0];
} else {
*x1 = x_intr[0];
*y1 = y_intr[0];
*x2 = x_intr[1];
*y2 = y_intr[1];
}
} else if (pos1) { /* Only x1/y1 was out - update only it */
/* Nov 2010: When clip_line() and draw_clip_line() were consolidated in */
/* 2000, the test below was the only point of difference between them. */
/* Unfortunately, the wrong version was kept. Now I change it back. */
/* The effect of the wrong version (>= rather than >) was that a line */
/* from ymin to ymax+eps was clipped to ymin,ymin rather than ymin,ymax */
if (dx * (*x2 - x_intr[0]) + dy * (*y2 - y_intr[0]) > 0) {
*x1 = x_intr[0];
*y1 = y_intr[0];
} else {
*x1 = x_intr[1];
*y1 = y_intr[1];
}
} else { /* Only x2/y2 was out - update only it */
/* Same difference here, again */
if (dx * (x_intr[0] - *x1) + dy * (y_intr[0] - *y1) > 0) {
*x2 = x_intr[0];
*y2 = y_intr[0];
} else {
*x2 = x_intr[1];
*y2 = y_intr[1];
}
}
if (*x1 < x_min || *x1 > x_max || *x2 < x_min || *x2 > x_max || *y1 < y_min || *y1 > y_max || *y2 < y_min || *y2 > y_max)
return 0;
return -1;
}
/* Two routines to emulate move/vector sequence using line drawing routine. */
static unsigned int move_pos_x, move_pos_y;
void
clip_move(unsigned int x, unsigned int y)
{
move_pos_x = x;
move_pos_y = y;
}
void
clip_vector(unsigned int x, unsigned int y)
{
draw_clip_line(move_pos_x, move_pos_y, x, y);
move_pos_x = x;
move_pos_y = y;
}
/* Common routines for setting text or line color from t_colorspec */
void
apply_pm3dcolor(struct t_colorspec *tc, const struct termentry *t)
{
/* Replace colorspec with that of the requested line style */
struct lp_style_type style;
if (tc->type == TC_LINESTYLE) {
lp_use_properties(&style, tc->lt);
tc = &style.pm3d_color;
}
if (tc->type == TC_DEFAULT) {
(*t->linetype)(LT_BLACK);
return;
}
if (tc->type == TC_LT) {
if (t->set_color)
t->set_color(tc);
else
(*t->linetype)(tc->lt);
return;
}
if (tc->type == TC_RGB && t->set_color) {
t->set_color(tc);
return;
}
if (!is_plot_with_palette() || !t->set_color) {
(*t->linetype)(LT_BLACK);
return;
}
switch (tc->type) {
case TC_Z: set_color(cb2gray(z2cb(tc->value))); break;
case TC_CB: set_color(cb2gray(tc->value)); break;
case TC_FRAC: set_color(sm_palette.positive == SMPAL_POSITIVE ?
tc->value : 1-tc->value);
break;
}
}
void
reset_textcolor(const struct t_colorspec *tc, const struct termentry *t)
{
if (tc->type != TC_DEFAULT)
(*t->linetype)(LT_BLACK);
}
void
default_arrow_style(struct arrow_style_type *arrow)
{
static const struct lp_style_type tmp_lp_style = DEFAULT_LP_STYLE_TYPE;
arrow->tag = -1;
arrow->layer = 0;
arrow->lp_properties = tmp_lp_style;
arrow->head = 1;
arrow->head_length = 0.0;
arrow->head_lengthunit = first_axes;
arrow->head_angle = 15.0;
arrow->head_backangle = 90.0;
arrow->head_filled = 0;
}
void
free_labels(struct text_label *label)
{
struct text_label *temp;
char *master_font = label->font;
/* Labels generated by 'plot with labels' all use the same font */
if (master_font)
free(master_font);
while (label) {
if (label->text)
free(label->text);
if (label->font && label->font != master_font)
free(label->font);
temp=label->next;
free(label);
label = temp;
}
}
void
get_offsets(
struct text_label *this_label,
struct termentry *t,
int *htic, int *vtic)
{
if (this_label->lp_properties.pointflag) {
*htic = (pointsize * t->h_tic * 0.5);
*vtic = (pointsize * t->v_tic * 0.5);
} else {
*htic = 0;
*vtic = 0;
}
if (is_3d_plot) {
int htic2, vtic2;
map3d_position_r(&(this_label->offset), &htic2, &vtic2, "get_offsets");
*htic += htic2;
*vtic += vtic2;
} else {
double htic2, vtic2;
map_position_r(&(this_label->offset), &htic2, &vtic2, "get_offsets");
*htic += (int)htic2;
*vtic += (int)vtic2;
}
}
/*
* Write one label, with all the trimmings.
* This routine is used for both 2D and 3D plots.
*/
void
write_label(unsigned int x, unsigned int y, struct text_label *this_label)
{
int htic, vtic;
int justify = JUST_TOP; /* This was the 2D default; 3D had CENTRE */
apply_pm3dcolor(&(this_label->textcolor),term);
ignore_enhanced(this_label->noenhanced);
get_offsets(this_label, term, &htic, &vtic);
if (this_label->rotate && (*term->text_angle) (this_label->rotate)) {
write_multiline(x + htic, y + vtic, this_label->text,
this_label->pos, justify, this_label->rotate,
this_label->font);
(*term->text_angle) (0);
} else {
write_multiline(x + htic, y + vtic, this_label->text,
this_label->pos, justify, 0, this_label->font);
}
/* write_multiline() clips text to on_page; do the same for any point */
if (this_label->lp_properties.pointflag && on_page(x,y)) {
term_apply_lp_properties(&this_label->lp_properties);
(*term->point) (x, y, this_label->lp_properties.p_type);
/* the default label color is that of border */
term_apply_lp_properties(&border_lp);
}
ignore_enhanced(FALSE);
}
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