/*

Copyright (c) 1991 X Consortium

Permission is hereby granted, free of charge, to any person obtaining

a copy of this software and associated documentation files (the

"Software"), to deal in the Software without restriction, including

without limitation the rights to use, copy, modify, merge, publish,

distribute, sublicense, and/or sell copies of the Software, and to

permit persons to whom the Software is furnished to do so, subject to

the following conditions:

The above copyright notice and this permission notice shall be included

in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR

OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall

not be used in advertising or otherwise to promote the sale, use or

other dealings in this Software without prior written authorization

from the X Consortium.

*/

/*

* Eyes.c

*

* a widget which follows the mouse around

*/

#ifdef HAVE_CONFIG_H

# include "config.h"

#endif

# include <X11/Xos.h>

# include <stdio.h>

# include <X11/IntrinsicP.h>

# include <X11/StringDefs.h>

# include <X11/Xmu/Converters.h>

# include "EyesP.h"

# include <math.h>

# include <X11/extensions/shape.h>

# include <X11/Xlibint.h>

# include <stdlib.h>

#if (defined(SVR4) || defined(SYSV) && defined(i386))

extern double hypot(double, double);

#endif

#define offset(field) XtOffsetOf(EyesRec, eyes.field)

#define goffset(field) XtOffsetOf(WidgetRec, core.field)

static XtResource resources[] = {

{XtNwidth, XtCWidth, XtRDimension, sizeof(Dimension),

goffset(width), XtRImmediate, (XtPointer) 150},

{XtNheight, XtCHeight, XtRDimension, sizeof(Dimension),

goffset(height), XtRImmediate, (XtPointer) 100},

{XtNforeground, XtCForeground, XtRPixel, sizeof(Pixel),

offset(pixel[PART_PUPIL]), XtRString, XtDefaultForeground},

{XtNoutline, XtCForeground, XtRPixel, sizeof(Pixel),

offset(pixel[PART_OUTLINE]), XtRString, XtDefaultForeground},

{XtNcenterColor, XtCBackground, XtRPixel, sizeof (Pixel),

offset(pixel[PART_CENTER]), XtRString, XtDefaultBackground},

{XtNreverseVideo, XtCReverseVideo, XtRBoolean, sizeof (Boolean),

offset (reverse_video), XtRImmediate, (XtPointer) FALSE},

{XtNbackingStore, XtCBackingStore, XtRBackingStore, sizeof (int),

offset (backing_store), XtRString, "default"},

{XtNshapeWindow, XtCShapeWindow, XtRBoolean, sizeof (Boolean),

offset (shape_window), XtRImmediate, (XtPointer) TRUE},

{XtNdistance, XtCBoolean, XtRBoolean, sizeof(Boolean),

offset(distance), XtRImmediate, (XtPointer) FALSE },

};

#undef offset

#undef goffset

# define EYE_X(n) ((n) * 2.0)

# define EYE_Y(n) (0.0)

# define EYE_OFFSET (0.5) /* padding between eyes */

# define EYE_THICK (0.125) /* thickness of eye rim */

# define BALL_DIAM (0.2)

# define BALL_PAD (0.175)

# define EYE_DIAM (2.0 - (EYE_THICK + EYE_OFFSET) * 2)

# define BALL_DIST ((EYE_DIAM - BALL_DIAM) / 2.0 - BALL_PAD)

# define W_MIN_X (-1.0 + EYE_OFFSET)

# define W_MAX_X (3.0 - EYE_OFFSET)

# define W_MIN_Y (-1.5 + EYE_OFFSET)

# define W_MAX_Y (1.5 - EYE_OFFSET)

# define TPOINT_NONE (-1000) /* special value meaning "not yet set" */

# define TPointEqual(a, b) ((a).x == (b).x && (a).y == (b).y)

# define XPointEqual(a, b) ((a).x == (b).x && (a).y == (b).y)

# define AngleBetween(A, A0, A1) (A0 <= A1 ? A0 <= A && A <= A1 : \

A0 <= A || A <= A1)

static int delays[] = { 50, 100, 200, 400, 0 };

static void ClassInitialize(void)

{

XtAddConverter( XtRString, XtRBackingStore, XmuCvtStringToBackingStore,

NULL, 0 );

}

WidgetClass eyesWidgetClass = (WidgetClass) &eyesClassRec;

/* ARGSUSED */

static void Initialize (

Cardinal *num_args)

{

EyesWidget w = (EyesWidget)gnew;

XtGCMask valuemask;

XGCValues myXGCV;

int shape_event_base, shape_error_base;

/*

* set the colors if reverse video; these are the colors used:

*

* background - paper white

* foreground - text, ticks black

* border - border black (foreground)

*

* This doesn't completely work since the parent has already made up a

* border. Sigh.

*/

if (w->eyes.reverse_video) {

Pixel fg = w->eyes.pixel[PART_PUPIL];

Pixel bg = w->core.background_pixel;

if (w->core.border_pixel == fg)

w->core.border_pixel = bg;

if (w->eyes.pixel[PART_OUTLINE] == fg)

w->eyes.pixel[PART_OUTLINE] = bg;

if (w->eyes.pixel[PART_CENTER] == bg)

w->eyes.pixel[PART_CENTER] = fg;

w->eyes.pixel[PART_PUPIL] = bg;

w->core.background_pixel = fg;

}

myXGCV.foreground = w->eyes.pixel[PART_PUPIL];

myXGCV.background = w->core.background_pixel;

valuemask = GCForeground | GCBackground;

w->eyes.gc[PART_PUPIL] = XtGetGC(gnew, valuemask, &myXGCV);

myXGCV.foreground = w->eyes.pixel[PART_OUTLINE];

valuemask = GCForeground | GCBackground;

w->eyes.gc[PART_OUTLINE] = XtGetGC(gnew, valuemask, &myXGCV);

myXGCV.foreground = w->eyes.pixel[PART_CENTER];

myXGCV.background = w->eyes.pixel[PART_PUPIL];

valuemask = GCForeground | GCBackground;

w->eyes.gc[PART_CENTER] = XtGetGC(gnew, valuemask, &myXGCV);

w->eyes.update = 0;

/* wait for Realize to add the timeout */

w->eyes.interval_id = 0;

w->eyes.pupil[0].x = w->eyes.pupil[1].x = TPOINT_NONE;

w->eyes.pupil[0].y = w->eyes.pupil[1].y = TPOINT_NONE;

w->eyes.mouse.x = w->eyes.mouse.y = TPOINT_NONE;

if (w->eyes.shape_window && !XShapeQueryExtension (XtDisplay (w),

&shape_event_base,

&shape_error_base))

w->eyes.shape_window = False;

w->eyes.shape_mask = 0;

w->eyes.gc[PART_SHAPE] = NULL;

}

static void

drawEllipse(EyesWidget w, enum EyesPart part,

double centerx, double centery,

double oldx, double oldy,

double diam)

{

const TRectangle tpos = {

centerx - diam/2.0,

centery - diam/2.0,

diam, diam };

TRectangle pos;

Trectangle(&w->eyes.t, &tpos, &pos);

if (part == PART_CLEAR) {

XFillRectangle(XtDisplay(w), XtWindow(w),

w->eyes.gc[PART_CENTER],

(int)pos.x, (int)pos.y,

(int)pos.width+2, (int)pos.height+2);

return;

}

if (oldx != TPOINT_NONE || oldy != TPOINT_NONE)

drawEllipse(w, PART_CLEAR, oldx, oldy,

TPOINT_NONE, TPOINT_NONE, diam);

XFillRectangle(XtDisplay(w),

part == PART_SHAPE ? w->eyes.shape_mask : XtWindow(w),

w->eyes.gc[part],

(int)(pos.x + 0.5), (int)(pos.y + 0.5),

(int)(pos.width + 0.0), (int)(pos.height + 0.0));

/*

XFillArc(XtDisplay(w),

part == PART_SHAPE ? w->eyes.shape_mask : XtWindow(w),

w->eyes.gc[part],

(int)(pos.x + 0.5), (int)(pos.y + 0.5),

(int)(pos.width + 0.0), (int)(pos.height + 0.0),

90*64, 360*64);

*/

}

static void

eyeLiner(EyesWidget w,

Boolean draw,

int num)

{

drawEllipse(w, draw ? PART_OUTLINE : PART_SHAPE,

EYE_X(num), EYE_Y(num),

TPOINT_NONE, TPOINT_NONE,

EYE_DIAM + 2.0*EYE_THICK);

if (draw) {

drawEllipse(w, PART_CENTER, EYE_X(num), EYE_Y(num),

TPOINT_NONE, TPOINT_NONE,

EYE_DIAM);

}

}

static TPoint computePupil (

int num,

TPoint mouse,

const TRectangle *screen)

{

double cx, cy;

double dist;

double angle;

double dx, dy;

double cosa, sina;

TPoint ret;

cx = EYE_X(num); dx = mouse.x - cx;

cy = EYE_Y(num); dy = mouse.y - cy;

if (dx == 0 && dy == 0);

else {

angle = atan2 ((double) dy, (double) dx);

cosa = cos (angle);

sina = sin (angle);

dist = BALL_DIST;

if (screen)

{

/* use distance mapping */

double x0, y0, x1, y1;

double a[4];

x0 = screen->x - cx;

y0 = screen->y - cy;

x1 = x0 + screen->width;

y1 = y0 + screen->height;

a[0] = atan2(y0, x0);

a[1] = atan2(y1, x0);

a[2] = atan2(y1, x1);

a[3] = atan2(y0, x1);

if (AngleBetween(angle, a[0], a[1]))

{

/* left */

dist *= dx / x0;

}

else if (AngleBetween(angle, a[1], a[2]))

{

/* bottom */

dist *= dy / y1;

}

else if (AngleBetween(angle, a[2], a[3]))

{

/* right */

dist *= dx / x1;

}

else if (AngleBetween(angle, a[3], a[0]))

{

/* top */

dist *= dy / y0;

}

if (dist > BALL_DIST)

dist = BALL_DIST;

}

if (dist > hypot ((double) dx, (double) dy)) {

cx += dx;

cy += dy;

} else {

cx += dist * cosa;

cy += dist * sina;

}

}

ret.x = cx;

ret.y = cy;

return ret;

}

static void computePupils (

EyesWidget w,

TPoint mouse,

TPoint pupils[2])

{

TRectangle screen, *sp = NULL;

if (w->eyes.distance) {

Window r, cw;

int x, y;

r = RootWindowOfScreen(w->core.screen);

XTranslateCoordinates(XtDisplay(w), XtWindow(w), r, 0, 0, &x, &y, &cw);

screen.x = Tx(-x, -y, &w->eyes.t);

screen.y = Ty(-x, -y, &w->eyes.t);

screen.width = Twidth (w->core.screen->width, w->core.screen->height,

&w->eyes.t);

screen.height = Theight(w->core.screen->width, w->core.screen->height,

&w->eyes.t);

sp = &screen;

}

pupils[0] = computePupil (0, mouse, sp);

pupils[1] = computePupil (1, mouse, sp);

}

static void

eyeBall(EyesWidget w,

Boolean draw,

TPoint *old,

int num)

{

drawEllipse(w, draw ? PART_PUPIL : PART_CLEAR,

w->eyes.pupil[num].x, w->eyes.pupil[num].y,

old ? old->x : TPOINT_NONE, old ? old->y : TPOINT_NONE,

BALL_DIAM);

}

static void repaint_window (EyesWidget w)

{

if (XtIsRealized ((Widget) w)) {

eyeLiner (w, TRUE, 0);

eyeLiner (w, TRUE, 1);

computePupils (w, w->eyes.mouse, w->eyes.pupil);

eyeBall (w, TRUE, NULL, 0);

eyeBall (w, TRUE, NULL, 1);

}

}

static void

drawEye(EyesWidget w, TPoint newpupil, int num)

{

XPoint xnewpupil, xpupil;

xpupil.x = Xx(w->eyes.pupil[num].x, w->eyes.pupil[num].y, &w->eyes.t);

xpupil.y = Xy(w->eyes.pupil[num].x, w->eyes.pupil[num].y, &w->eyes.t);

xnewpupil.x = Xx(newpupil.x, newpupil.y, &w->eyes.t);

xnewpupil.y = Xy(newpupil.x, newpupil.y, &w->eyes.t);

if (

!XPointEqual(xpupil, xnewpupil)) {

TPoint oldpupil = w->eyes.pupil[num];

w->eyes.pupil[num] = newpupil;

eyeBall (w, TRUE, &oldpupil, num);

}

}

static void

drawEyes(EyesWidget w, TPoint mouse)

{

TPoint newpupil[2];

int num;

if (TPointEqual (mouse, w->eyes.mouse)) {

if (delays[w->eyes.update + 1] != 0)

++w->eyes.update;

return;

}

computePupils (w, mouse, newpupil);

for (num = 0; num < 2; num ++) {

drawEye(w, newpupil[num], num);

}

w->eyes.mouse = mouse;

w->eyes.update = 0;

}

static void draw_it_core(EyesWidget w)

{

Window rep_root, rep_child;

int rep_rootx, rep_rooty;

unsigned int rep_mask;

int dx, dy;

TPoint mouse;

Display *dpy = XtDisplay (w);

Window win = XtWindow (w);

XQueryPointer (dpy, win, &rep_root, &rep_child,

&rep_rootx, &rep_rooty, &dx, &dy, &rep_mask);

mouse.x = Tx(dx, dy, &w->eyes.t);

mouse.y = Ty(dx, dy, &w->eyes.t);

drawEyes(w, mouse);

}

/* ARGSUSED */

static void draw_it (

XtPointer client_data,

XtIntervalId *id) /* unused */

{

EyesWidget w = (EyesWidget)client_data;

if (XtIsRealized((Widget)w)) {

draw_it_core(w);

}

w->eyes.interval_id =

XtAppAddTimeOut(XtWidgetToApplicationContext((Widget) w),

delays[w->eyes.update], draw_it, (XtPointer)w);

} /* draw_it */

static void Resize (Widget gw)

{

EyesWidget w = (EyesWidget) gw;

XGCValues xgcv;

Widget parent;

Display *dpy = XtDisplay (w);

int x, y;

if (XtIsRealized (gw))

{

XClearWindow (dpy, XtWindow (w));

SetTransform (&w->eyes.t,

0, w->core.width,

w->core.height, 0,

W_MIN_X, W_MAX_X,

W_MIN_Y, W_MAX_Y);

if (w->eyes.shape_window) {

w->eyes.shape_mask = XCreatePixmap (dpy, XtWindow (w),

w->core.width, w->core.height, 1);

if (!w->eyes.gc[PART_SHAPE])

w->eyes.gc[PART_SHAPE] = XCreateGC (dpy, w->eyes.shape_mask,

0, &xgcv);

XSetForeground (dpy, w->eyes.gc[PART_SHAPE], 0);

XFillRectangle (dpy, w->eyes.shape_mask, w->eyes.gc[PART_SHAPE],

0, 0, w->core.width, w->core.height);

XSetForeground (dpy, w->eyes.gc[PART_SHAPE], 1);

eyeLiner (w, FALSE, 0);

eyeLiner (w, FALSE, 1);

x = y = 0;

for (parent = (Widget) w; XtParent (parent); parent = XtParent (parent)) {

x += parent->core.x + parent->core.border_width;

x += parent->core.y + parent->core.border_width;

}

XShapeCombineMask (XtDisplay (parent), XtWindow (parent), ShapeBounding,

x, y, w->eyes.shape_mask, ShapeSet);

XFreePixmap (dpy, w->eyes.shape_mask);

}

}

}

static void Realize (

Widget gw,

XtValueMask *valueMask,

XSetWindowAttributes *attrs)

{

EyesWidget w = (EyesWidget)gw;

if (w->eyes.backing_store != Always + WhenMapped + NotUseful) {

attrs->backing_store = w->eyes.backing_store;

*valueMask |= CWBackingStore;

}

XtCreateWindow( gw, (unsigned)InputOutput, (Visual *)CopyFromParent,

*valueMask, attrs );

Resize (gw);

w->eyes.interval_id =

XtAppAddTimeOut(XtWidgetToApplicationContext(gw),

delays[w->eyes.update], draw_it, (XtPointer)gw);

}

static void Destroy (Widget gw)

{

EyesWidget w = (EyesWidget)gw;

int i;

if (w->eyes.interval_id)

XtRemoveTimeOut (w->eyes.interval_id);

for (i = 0; i < PART_MAX; i ++)

XtReleaseGC(gw, w->eyes.gc[i]);

}

/* ARGSUSED */

static void Redisplay(

Widget gw,

XEvent *event,

Region region)

{

EyesWidget w;

w = (EyesWidget) gw;

w->eyes.pupil[0].x = TPOINT_NONE;

w->eyes.pupil[0].y = TPOINT_NONE;

w->eyes.pupil[1].x = TPOINT_NONE;

w->eyes.pupil[1].y = TPOINT_NONE;

(void) repaint_window ((EyesWidget)gw);

}

/* ARGSUSED */

static Boolean SetValues (

Cardinal *num_args)

{

return( FALSE );

}

EyesClassRec eyesClassRec = {

{ /* core fields */

/* superclass */ &widgetClassRec,

/* class_name */ "Eyes",

/* size */ sizeof(EyesRec),

/* class_initialize */ ClassInitialize,

/* class_part_initialize */ NULL,

/* class_inited */ FALSE,

/* initialize */ Initialize,

/* initialize_hook */ NULL,

/* realize */ Realize,

/* actions */ NULL,

/* num_actions */ 0,

/* resources */ resources,

/* num_resources */ XtNumber(resources),

/* xrm_class */ NULLQUARK,

/* compress_motion */ TRUE,

/* compress_exposure */ TRUE,

/* compress_enterleave */ TRUE,

/* visible_interest */ FALSE,

/* destroy */ Destroy,

/* resize */ Resize,

/* expose */ Redisplay,

/* set_values */ SetValues,

/* set_values_hook */ NULL,

/* set_values_almost */ NULL,

/* get_values_hook */ NULL,

/* accept_focus */ NULL,

/* version */ XtVersion,

/* callback_private */ NULL,

/* tm_table */ NULL,

/* query_geometry */ XtInheritQueryGeometry,

}

};