gnuplot-old/src/gadgets.c at axis_branch_base · gnuplot/gnuplot-old · GitHub

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#ifndef lint

static char *RCSid() { return RCSid("gadgets.c,v 1.1.3.1 2000/05/03 21:47:15 hbb Exp"); }

#endif

/* GNUPLOT - gadgets.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 "gadgets.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 */

/* Control variables for the 'key' */

t_key_flag key = KEY_AUTO_PLACEMENT; /* default position */

struct position key_user_pos; /* user specified position for key */

/* horizontal auto-positioning: left/right/'out' */

t_key_horizontal_position key_hpos = TRIGHT;

/* vertical auto-positioning: top/bottom/below */

t_key_vertical_position key_vpos = TTOP;

/* alignment of key labels: left/right */

t_key_sample_positioning key_just = JRIGHT;

TBOOLEAN key_reverse = FALSE; /* reverse text & sample ? */

/* FIXME HBB 20000521: these initial values should be accessible

* separately, as defaults for unset.c */

double key_swidth = 4.0;

double key_vert_factor = 1.0;

double key_width_fix = 0.0;

char key_title[MAX_LINE_LEN+1] = "";

#define DEFAULT_KEYBOX_LP { 0, -3, 0, 1.0, 1.0 } /* -3 = no linetype */

const struct lp_style_type default_keybox_lp = DEFAULT_KEYBOX_LP;

struct lp_style_type key_box = DEFAULT_KEYBOX_LP;

/* The graph box, in terminal coordinates, as calculated by boundary()

* or boundary3d(): */

/* FIXME HBB 20000521: should probably be unsigned... */

int xleft, xright, ybot, ytop;

/* '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 */

/* space between left edge and xleft in chars (-1: computed) */

int lmargin = -1;

/* space between bottom and ybot in chars (-1: computed) */

int bmargin = -1;

/* space between right egde and xright in chars (-1: computed) */

int rmargin = -1;

/* space between top egde and ytop in chars (-1: computed) */

int tmargin = -1;

/* 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;

/* set arrow */

struct arrow_def *first_arrow = NULL;

/* 'set title' status */

label_struct title = EMPTY_LABELSTRUCT;

/* 'set timelabel' status */

label_struct 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' command */

double pointsize = 1.0;

/* set border */

struct lp_style_type border_lp = { 0, -2, 0, 1.0, 1.0 };

int draw_border = 31;

/* set clip */

TBOOLEAN clip_lines1 = TRUE;

TBOOLEAN clip_lines2 = FALSE;

/* FIXME HBB 20000521: clip_points is only used by 2D plots. This may

* well constitute a yet unknown bug... */

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;

TBOOLEAN suppressMove = FALSE; /* to prevent moveto while drawing contours */

/*****************************************************************/

/* Routines that deal with global objects defined in this module */

/*****************************************************************/

/* Clipping to the bounding box: */

/* Test a single point to be within the xleft,xright,ybot,ytop bbox.

* 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 above of ytop.

* bit 3 if below of ybot.

* 0 is returned if inside.

int

clip_point(x, y)

unsigned int x, y;

{

int ret_val = 0;

if (x < xleft)

ret_val |= 0x01;

if (x > xright)

ret_val |= 0x02;

if (y < ybot)

ret_val |= 0x04;

if (y > ytop)

ret_val |= 0x08;

return ret_val;

}

/* Clip the given line to drawing coords defined as xleft,xright,ybot,ytop.

* This routine uses the cohen & sutherland bit mapping for fast clipping -

* see "Principles of Interactive Computer Graphics" Newman & Sproull page 65.

/* FIXME HBB 20000522: The parameter type has to become unsigned int */

void

draw_clip_line(x1, y1, x2, y2)

int x1, y1, x2, y2;

{

#if defined(ATARI) || defined(MTOS)

/* HBB 20000522: why would this test be particular to ATARIs? And

* what was the bug this is supposed to fix? */

if (x1 < 0 || x2 < 0 || y1 < 0 || y2 < 0)

return; /* temp bug fix */

#endif

/* HBB 20000522: I've made this routine use the clippling in

* clip_line(), in a movement to reduce code duplication. There

* was one very small difference between these two routines. See

* clip_line() for a comment about it, at the relevant place. */

if (!clip_line(&x1,&x2,&y1,&y2))

/* clip_line() returns zero --> segment completely outside

* bounding box */

return;

/* HBB 20000617: there was a design error, here. By nature, this

* is a 2D routine. It should never have to check for hidden3d

* related variables, or call the hidden3d routine

* draw_line_hidden, like this. I've thrown this out. */

/* FIXME HBB 20000522: I strongly doubt this can work as

* advertised. It's supposed to allow for continuous contour

* curves, but as soon as the contour curve moves outside the

* boundary, you get overpainting instead, as the contour curve

* walks along the border. Or worse artefacts. */

if (!suppressMove)

(*t->move) (x1, y1);

(*t->vector) (x2, y2);

}

/* And text clipping routine. */

void

clip_put_text(x, y, str)

unsigned int x, y;

char *str;

{

if (clip_point(x, y))

return;

(*t->put_text) (x, y, str);

}

/* seems sensible to put the justification in here too..? */

void

clip_put_text_just(x, y, str, just)

unsigned int x, y;

char *str;

enum JUSTIFY just;

{

if (clip_point(x, y))

return;

if (!(*t->justify_text) (just)) {

assert(CENTRE == 1 && RIGHT == 2);

x -= (t->h_char * strlen(str) * just) / 2;

}

(*t->put_text) (x, y, str);

}

/* Clip the given line to drawing coords defined as xleft,xright,ybot,ytop.

* This routine uses the cohen & sutherland bit mapping for fast clipping -

* see "Principles of Interactive Computer Graphics" Newman & Sproull page 65.

/* FIXME HBB 20000521: the parameters of this routine should become

* unsigned ints. */

int

clip_line(x1, y1, x2, y2)

int *x1, *y1, *x2, *y2;

{

int x, y, dx, dy, 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 = (ybot - *y2) * dx / dy + *x2; /* Test for ybot boundary. */

if (x >= xleft && x <= xright) {

x_intr[count] = x;

y_intr[count++] = ybot;

}

x = (ytop - *y2) * dx / dy + *x2; /* Test for ytop boundary. */

if (x >= xleft && x <= xright) {

x_intr[count] = x;

y_intr[count++] = ytop;

}

/* Find intersections with the y parallel bbox lines: */

if (dx != 0) {

y = (xleft - *x2) * dy / dx + *y2; /* Test for xleft boundary. */

if (y >= ybot && y <= ytop) {

x_intr[count] = xleft;

y_intr[count++] = y;

}

y = (xright - *x2) * dy / dx + *y2; /* Test for xright boundary. */

if (y >= ybot && y <= ytop) {

x_intr[count] = 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 */

*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 */

/* This is about the only real difference between this and

* draw_clip_line(): it compares for '>0', here */

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(x, y)

unsigned int x, y;

{

move_pos_x = x;

move_pos_y = y;

}

void

clip_vector(x, y)

unsigned int x, y;

{

draw_clip_line(move_pos_x, move_pos_y, x, y);

move_pos_x = x;

move_pos_y = y;

}

gnuplot-old/src/gadgets.c at axis_branch_base · gnuplot/gnuplot-old · GitHub

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