/* xscreensaver, Copyright (c) 1992-2011 Jamie Zawinski <jwz@jwz.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
/* wormhole:
* Animation of moving through a wormhole. Based on my own code written
* a few years ago.
* author: Jon Rafkind <jon@rafkind.com>
* date: 1/19/04
*/
#include <math.h>
#include "screenhack.h"
#ifndef debug
#define debug printf("File:%s Line:%d\n", __FILE__, __LINE__ );
#endif
typedef struct STAR{
int x, y;
int calc_x, calc_y;
int Z;
int center_x, center_y;
} star;
typedef struct STARLINE{
star begin, end;
} starline;
/*
typedef struct RGBHANDLE{
XColor mine;
unsigned short rwant, gwant, bwant;
} RGBHandle;
*/
typedef struct COLORCHANGER{
XColor * shade;
int min, max;
int shade_use;
int shade_max;
int min_want;
/* RGBHandle handle_begin, handle_end; */
} color_changer;
typedef struct WORMHOLE{
int diameter;
int diameter_change;
int actualx, actualy;
double virtualx, virtualy;
double speed;
int ang;
int want_ang;
int want_x, want_y;
int max_Z;
int addStar;
int spiral;
color_changer changer;
starline ** stars;
int num_stars; /* top of array we are using */
XColor black;
Pixmap work;
} wormhole;
struct state {
Display *dpy;
Window window;
int SCREEN_X, SCREEN_Y;
int z_speed;
int make_stars;
int delay;
wormhole worm;
GC gc;
Colormap cmap;
};
/*inline*/ static int rnd( int q )
{
if (q < 1) q = 1;
return random() % q;
}
static int gang( int x1, int y1, int x2, int y2 )
{
int tang = 0;
if ( x1 == x2 ) {
if ( y1 < y2 )
tang = 90;
else
tang = 270;
} else if ( y1 == y2 ) {
if ( x1 < x2 )
tang = 0;
else
tang = 180;
} else {
tang = (int)(0.5+atan2( -(y2-y1), x2 - x1 ) * 180.0 / M_PI );
}
while ( tang < 0 )
tang += 360;
return tang % 360;
}
static void blend_palette( XColor * pal, int max, XColor * sc, XColor * ec )
{
int q;
int sc_r = sc->red;
int sc_g = sc->green;
int sc_b = sc->blue;
int ec_r = ec->red;
int ec_g = ec->green;
int ec_b = ec->blue;
for ( q = 0; q < max; q++ ) {
float j = (float)( q ) / (float)( max );
int f_r = (int)( 0.5 + (float)( sc_r ) + (float)( ec_r-sc_r ) * j );
int f_g = (int)( 0.5 + (float)( sc_g ) + (float)( ec_g-sc_g ) * j );
int f_b = (int)( 0.5 + (float)( sc_b ) + (float)( ec_b-sc_b ) * j );
/* pal[q] = makecol( f_r, f_g, f_b ); */
pal[q].red = f_r;
pal[q].blue = f_b;
pal[q].green = f_g;
}
}
/*
static void initHandle( RGBHandle * handle )
{
handle->mine.red = rnd( 65536 );
handle->mine.green = rnd( 65536 );
handle->mine.blue = rnd( 65536 );
handle->rwant = rnd( 65536 );
handle->gwant = rnd( 65536 );
handle->bwant = rnd( 65536 );
}
*/
static void initXColor( XColor * color )
{
color->red = rnd( 50000 ) + 10000;
color->blue = rnd( 50000 ) + 10000;
color->green = rnd( 50000 ) + 10000;
}
static void initColorChanger( struct state *st, color_changer * ch )
{
int q;
XColor old_color, new_color;
ch->shade_max = 2048;
ch->shade_use = 128;
ch->min = 0;
ch->max = ch->shade_use;
ch->min_want = rnd( ch->shade_max - ch->shade_use );
ch->shade = (XColor *)malloc( sizeof(XColor) * ch->shade_max );
memset( ch->shade, 0, sizeof(XColor) * ch->shade_max );
initXColor( &old_color );
initXColor( &new_color );
for ( q = 0; q < ch->shade_max; q += ch->shade_use ){
blend_palette( ch->shade + q, ch->shade_use, &old_color, &new_color );
old_color = new_color;
initXColor( &new_color );
}
for ( q = 0; q < ch->shade_max; q++ )
XAllocColor( st->dpy, st->cmap, &( ch->shade[q] ) );
/*
initHandle( &(ch->handle_begin) );
initHandle( &(ch->handle_end) );
ch->shade = (XColor *)malloc( sizeof(XColor) * MAX_COLORS );
ch->max = MAX_COLORS;
memset( ch->shade, 0, sizeof(XColor) * ch->max );
blend_palette( ch->shade, ch->max, &(ch->handle_begin.mine), &(ch->handle_end.mine) );
for ( q = 0; q < ch->max; q++ )
XAllocColor( st->dpy, *cmap, &( ch->shade[q] ) );
*/
}
/*
static void changeColor( unsigned short * col, unsigned short * change, int min, int max )
{
int RGB_GO_BLACK = 30;
if ( *col < *change ) *col++;
if ( *col > *change ) *col--;
if ( *col == *change ){
if ( rnd( RGB_GO_BLACK ) == rnd( RGB_GO_BLACK ) )
*change = 0;
else *change = rnd(max-min) + min;
}
}
*/
/*
static void moveRGBHandle( RGBHandle * handle, int min, int max )
{
unsigned short * want[ 3 ];
int q;
int cy = 0;
want[0] = &(handle->rwant);
want[1] = &(handle->gwant);
want[2] = &(handle->bwant);
for ( q = 0; q < 10; q++ ){
changeColor( &( handle->mine.red ), &handle->rwant, min, max );
changeColor( &( handle->mine.green ), &handle->gwant, min, max );
changeColor( &( handle->mine.blue ), &handle->bwant, min, max );
}
for ( q = 0; q < 3; q++ )
cy = cy || (*(want[q]) >= min && *(want[q]) <= max);
if ( !cy ) *(want[rnd(3)]) = rnd(max-min)+min;
cy = 1;
for ( q = 0; q < 3; q++ )
cy = cy && *(want[q]) == 0;
if ( cy ) *(want[rnd(3)]) = rnd(max-min)+min;
if ( rnd( 30 ) == rnd( 30 ) )
*(want[rnd(3)]) = rnd(max-min)+min;
}
*/
static void moveColorChanger( color_changer * ch )
{
/* int q; */
if ( ch->min < ch->min_want ){
ch->min++;
ch->max++;
}
if ( ch->min > ch->min_want ) {
ch->min--;
ch->max--;
}
if ( ch->min == ch->min_want )
ch->min_want = rnd( ch->shade_max - ch->shade_use );
/*
for ( q = 0; q < ch->max; q++ )
XFreeColors( st->dpy, *cmap, &( ch->shade[q].pixel ), 1, 0 );
moveRGBHandle( &( ch->handle_begin ), 5000, 65500 );
moveRGBHandle( &( ch->handle_end ), 5000, 65500 );
blend_palette( ch->shade, ch->max, &(ch->handle_begin.mine), &(ch->handle_end.mine) );
for ( q = 0; q < ch->max; q++ )
XAllocColor( st->dpy, *cmap, &( ch->shade[q] ) );
*/
}
static void destroyColorChanger( struct state *st, color_changer * ch )
{
int q;
for ( q = 0; q < ch->max; q++ )
XFreeColors( st->dpy, st->cmap, &( ch->shade[q].pixel ), 1, 0 );
free( ch->shade );
}
static void resizeWormhole( struct state *st, wormhole * worm )
{
XWindowAttributes attr;
XGetWindowAttributes( st->dpy, st->window, &attr );
st->cmap = attr.colormap;
st->SCREEN_X = attr.width;
st->SCREEN_Y = attr.height;
# ifndef HAVE_JWXYZ /* Don't second-guess Quartz's double-buffering */
XFreePixmap( st->dpy, worm->work );
worm->work = XCreatePixmap( st->dpy, st->window, st->SCREEN_X, st->SCREEN_Y, attr.depth );
# endif
}
static void initWormhole( struct state *st, wormhole * worm, Display * display, Window win )
{
int i;
XWindowAttributes attr;
XGetWindowAttributes( st->dpy, st->window, &attr );
st->cmap = attr.colormap;
st->SCREEN_X = attr.width;
st->SCREEN_Y = attr.height;
# ifdef HAVE_JWXYZ /* Don't second-guess Quartz's double-buffering */
worm->work = st->window;
# else
worm->work = XCreatePixmap( st->dpy, st->window, st->SCREEN_X, st->SCREEN_Y, attr.depth );
# endif
worm->diameter = rnd( 10 ) + 15;
worm->diameter_change = rnd( 10 ) + 15;
/* worm->actualx = rnd( attr.width );
worm->actualy = rnd( attr.height ); */
worm->actualx = attr.width / 2;
worm->actualy = attr.height / 2;
worm->virtualx = worm->actualx;
worm->virtualy = worm->actualy;
worm->speed = (float)st->SCREEN_X / 180.0;
/* z_speed = SCREEN_X / 120; */
worm->spiral = 0;
worm->addStar = st->make_stars;
worm->want_x = rnd( attr.width - 50 ) + 25;
worm->want_y = rnd( attr.height - 50 ) + 25;
worm->want_ang = gang( worm->actualx, worm->actualy, worm->want_x, worm->want_y );
worm->ang = worm->want_ang;
worm->max_Z = 600;
worm->black.red = 0;
worm->black.green = 0;
worm->black.blue = 0;
XAllocColor( st->dpy, st->cmap, &worm->black );
initColorChanger( st, &(worm->changer) );
worm->num_stars = 64;
worm->stars = (starline **)calloc(sizeof(starline *), worm->num_stars);
for ( i = 0; i < worm->num_stars; i++ ) {
if (worm->stars[i]) free (worm->stars[i]);
worm->stars[i] = NULL;
}
}
static void destroyWormhole( struct state *st, wormhole * worm )
{
int i;
destroyColorChanger( st, &(worm->changer));
if (worm->work != st->window) {
XFreePixmap( st->dpy, worm->work );
worm->work = 0;
}
for (i = 0; i < worm->num_stars; i++)
if (worm->stars[i]) free(worm->stars[i]);
free(worm->stars);
}
static double Cos( int a )
{
return cos( a * 180.0 / M_PI );
}
static double Sine( int a )
{
return sin( a * 180.0 / M_PI );
}
static void calcStar( star * st )
{
if ( st->center_x == 0 || st->center_y == 0 ){
st->Z = 0;
return;
}
if ( st->Z <= 0 ){
st->calc_x = (st->x << 10) / st->center_x;
st->calc_y = (st->y << 10) / st->center_y;
} else {
st->calc_x = (st->x << 10 ) / st->Z + st->center_x;
st->calc_y = (st->y << 10 ) / st->Z + st->center_y;
}
}
static void initStar( star * st, int Z, int ang, wormhole * worm )
{
st->x = Cos( ang ) * worm->diameter;
st->y = Sine( ang ) * worm->diameter;
st->center_x = worm->actualx;
st->center_y = worm->actualy;
st->Z = Z;
calcStar( st );
}
static void addStar( wormhole * worm )
{
starline * star_new;
starline ** xstars;
int old_stars;
int q;
int ang;
star_new = (starline *)malloc( sizeof( starline ) );
ang = rnd( 360 );
initStar( &star_new->begin, worm->max_Z, ang, worm );
initStar( &star_new->end, worm->max_Z+rnd(6)+4, ang, worm );
for ( q = 0; q < worm->num_stars; q++ ){
if ( worm->stars[q] == NULL ){
worm->stars[q] = star_new;
return;
}
}
old_stars = worm->num_stars;
worm->num_stars = worm->num_stars << 1;
xstars = (starline **)malloc( sizeof(starline *) * worm->num_stars );
for ( q = 0; q < worm->num_stars; q++ )
xstars[q] = NULL;
for ( q = 0; q < old_stars; q++ )
if ( worm->stars[q] != NULL ) xstars[q] = worm->stars[q];
free( worm->stars );
worm->stars = xstars;
worm->stars[ old_stars ] = star_new;
}
static int moveStar( struct state *st, starline * stl )
{
stl->begin.Z -= st->z_speed;
stl->end.Z -= st->z_speed;
calcStar( &stl->begin );
calcStar( &stl->end );
return ( stl->begin.Z <= 0 || stl->end.Z <= 0 );
}
static int dist( int x1, int y1, int x2, int y2 )
{
int xs, ys;
xs = x1-x2;
ys = y1-y2;
return (int)sqrt( xs*xs + ys*ys );
}
static void moveWormhole( struct state *st, wormhole * worm )
{
int q;
double dx, dy;
/* int x1, y1, x2, y2; */
int min_dist = 100;
int find = 0;
dx = Cos( worm->ang ) * worm->speed;
dy = Sine( worm->ang ) * worm->speed;
worm->virtualx += dx;
worm->virtualy += dy;
worm->actualx = (int)worm->virtualx;
worm->actualy = (int)worm->virtualy;
if ( worm->spiral ){
if ( worm->spiral % 5 == 0 )
worm->ang = (worm->ang + 1 ) % 360;
worm->spiral--;
if ( worm->spiral <= 0 ) find = 1;
} else {
if ( dist( worm->actualx, worm->actualy, worm->want_x, worm->want_y ) < 20 )
find = 1;
if ( rnd( 20 ) == rnd( 20 ) )
find = 1;
if ( worm->actualx < min_dist ){
worm->actualx = min_dist;
worm->virtualx = worm->actualx;
find = 1;
}
if ( worm->actualy < min_dist ){
worm->actualy = min_dist;
worm->virtualy = worm->actualy;
find = 1;
}
if ( worm->actualx > st->SCREEN_X - min_dist ){
worm->actualx = st->SCREEN_X - min_dist;
worm->virtualx = worm->actualx;
find = 1;
}
if ( worm->actualy > st->SCREEN_Y - min_dist ){
worm->actualy = st->SCREEN_Y - min_dist;
worm->virtualy = worm->actualy;
find = 1;
}
if ( rnd( 500 ) == rnd( 500 ) ) worm->spiral = rnd( 30 ) + 50;
}
if ( find ){
worm->want_x = rnd( st->SCREEN_X - min_dist * 2 ) + min_dist;
worm->want_y = rnd( st->SCREEN_Y - min_dist * 2 ) + min_dist;
worm->ang = gang( worm->actualx, worm->actualy, worm->want_x, worm->want_y );
}
/* worm->ang = ( worm->ang + 360 + rnd( 30 ) - 15 ) % 360; */
/*
if ( worm->ang < worm->want_ang ) worm->ang++;
if ( worm->ang > worm->want_ang ) worm->ang--;
if ( worm->ang == worm->want_ang && rnd( 3 ) == rnd( 3 ) ) worm->want_ang = rnd( 360 );
*/
/*
if ( rnd( 25 ) == rnd( 25 ) ){
x1 = worm->actualx;
y1 = worm->actualy;
x2 = SCREEN_X / 2 + rnd( 20 ) - 10;
y2 = SCREEN_Y / 2 + rnd( 20 ) - 10;
worm->want_ang = gang(x1,y1,x2,y2);
}
*/
/*
if ( worm->actualx < min_dist || worm->actualx > SCREEN_X - min_dist || worm->actualy < min_dist || worm->actualy > SCREEN_Y - min_dist ){
x1 = worm->actualx;
y1 = worm->actualy;
x2 = SCREEN_X / 2 + rnd( 20 ) - 10;
y2 = SCREEN_Y / 2 + rnd( 20 ) - 10;
/ * worm->ang = gang( worm->actualx, worm->actualy, SCREEN_X/2+rnd(20)-10, SCREEN_Y/2+rnd(20)-10 ); * /
worm->ang = gang( x1, y1, x2, y2 );
worm->want_ang = worm->ang;
/ * printf("Angle = %d\n", worm->ang ); * /
if ( worm->actualx < min_dist )
worm->actualx = min_dist;
if ( worm->actualx > SCREEN_X - min_dist )
worm->actualx = SCREEN_X - min_dist;
if ( worm->actualy < min_dist )
worm->actualy = min_dist;
if ( worm->actualy > SCREEN_Y - min_dist )
worm->actualy = SCREEN_Y - min_dist;
worm->virtualx = worm->actualx;
worm->virtualy = worm->actualy;
}
*/
for ( q = 0; q < worm->num_stars; q++ ){
if ( worm->stars[q] != NULL ){
if ( moveStar( st, worm->stars[q] ) ){
free( worm->stars[q] );
worm->stars[q] = NULL;
}
}
}
moveColorChanger( &worm->changer );
if ( worm->diameter < worm->diameter_change )
worm->diameter++;
if ( worm->diameter > worm->diameter_change )
worm->diameter--;
if ( rnd( 30 ) == rnd( 30 ) )
worm->diameter_change = rnd( 35 ) + 5;
for ( q = 0; q < worm->addStar; q++ )
addStar( worm );
}
static XColor * getColorShade( color_changer * ch )
{
return ch->shade + ch->min;
}
static void drawWormhole( struct state *st, wormhole * worm )
{
int i;
int color;
int z;
starline * current;
XColor * xcol;
XColor * shade;
XSetForeground( st->dpy, st->gc, worm->black.pixel );
XFillRectangle( st->dpy, worm->work, st->gc, 0, 0, st->SCREEN_X, st->SCREEN_Y );
for ( i = 0; i < worm->num_stars; i++ )
if ( worm->stars[i] != NULL ){
current = worm->stars[i];
z = current->begin.Z;
color = z * worm->changer.shade_use / worm->max_Z;
shade = getColorShade( &worm->changer );
/* xcol = &worm->changer.shade[ color ]; */
xcol = &shade[ color ];
XSetForeground( st->dpy, st->gc, xcol->pixel );
/* XDrawLine( st->dpy, st->window, *gc, current->begin.calc_x, current->begin.calc_y, current->end.calc_x, current->end.calc_y ); */
XDrawLine( st->dpy, worm->work, st->gc, current->begin.calc_x, current->begin.calc_y, current->end.calc_x, current->end.calc_y );
}
if (worm->work != st->window)
XCopyArea( st->dpy, worm->work, st->window, st->gc, 0, 0, st->SCREEN_X, st->SCREEN_Y, 0, 0 );
}
/*
static void eraseWormhole( Display * display, Window * st->window, wormhole * worm ){
starline * current;
int i;
XColor * xcol;
for ( i = 0; i < worm->num_stars; i++ )
if ( worm->stars[i] != NULL ){
xcol = &worm->black;
current = worm->stars[i];
XSetForeground( st->dpy, *gc, xcol->pixel );
XDrawLine( st->dpy, st->window, *gc, current->begin.calc_x, current->begin.calc_y, current->end.calc_x, current->end.calc_y );
}
}
*/
static void *
wormhole_init (Display *dpy, Window window)
{
struct state *st = (struct state *) calloc (1, sizeof(*st));
XGCValues gcv;
XWindowAttributes attr;
st->dpy = dpy;
st->window = window;
st->delay = get_integer_resource(st->dpy, "delay", "Integer" );
st->make_stars = get_integer_resource(st->dpy, "stars", "Integer" );
st->z_speed = get_integer_resource(st->dpy, "zspeed", "Integer" );
initWormhole( st, &st->worm, st->dpy, st->window );
st->gc = XCreateGC( st->dpy, st->window, 0, &gcv );
XGetWindowAttributes( st->dpy, st->window, &attr );
st->cmap = attr.colormap;
return st;
}
static unsigned long
wormhole_draw (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
moveWormhole( st, &st->worm );
drawWormhole( st, &st->worm );
return st->delay;
}
static void
wormhole_reshape (Display *dpy, Window window, void *closure,
unsigned int w, unsigned int h)
{
struct state *st = (struct state *) closure;
resizeWormhole( st, &st->worm );
}
static Bool
wormhole_event (Display *dpy, Window window, void *closure, XEvent *event)
{
return False;
}
static void
wormhole_free (Display *dpy, Window window, void *closure)
{
struct state *st = (struct state *) closure;
destroyWormhole (st, &st->worm);
XFreeGC (dpy, st->gc);
free (st);
}
static const char *wormhole_defaults [] = {
".lowrez: true",
".background: Black",
".foreground: #E9967A",
"*delay: 10000",
"*zspeed: 10",
"*stars: 20",
#ifdef HAVE_MOBILE
"*ignoreRotation: True",
#endif
0
};
static XrmOptionDescRec wormhole_options [] = {
{ "-delay", ".delay", XrmoptionSepArg, 0 },
{ "-zspeed", ".zspeed", XrmoptionSepArg, 0 },
{ "-stars", ".stars", XrmoptionSepArg, 0 },
{ 0, 0, 0, 0 }
};
XSCREENSAVER_MODULE ("Wormhole", wormhole)
