/* xscreensaver, Copyright (c) 2007-2014 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.
*
* cwaves -- languid sinusoidal colors.
*/
#include "screenhack.h"
#include <stdio.h>
#include "ximage-loader.h"
#define BELLRAND(n) ((frand((n)) + frand((n)) + frand((n))) / 3)
typedef struct {
double scale;
double offset;
double delta;
} wave;
typedef struct {
Display *dpy;
Window window;
XWindowAttributes xgwa;
GC gc;
int delay;
int scale;
int ncolors;
XColor *colors;
int nwaves;
wave *waves;
int debug_p;
} state;
static void *
cwaves_init (Display *dpy, Window window)
{
int i;
XGCValues gcv;
state *st = (state *) calloc (1, sizeof (*st));
st->dpy = dpy;
st->window = window;
XGetWindowAttributes (st->dpy, st->window, &st->xgwa);
st->debug_p = get_boolean_resource (dpy, "debug", "Boolean");
st->scale = get_integer_resource (dpy, "scale", "Integer");
if (st->scale <= 0) st->scale = 1;
st->ncolors = get_integer_resource (dpy, "ncolors", "Integer");
if (st->ncolors < 4) st->ncolors = 4;
st->colors = (XColor *) malloc (sizeof(*st->colors) * (st->ncolors+1));
make_smooth_colormap (st->xgwa.screen, st->xgwa.visual, st->xgwa.colormap,
st->colors, &st->ncolors,
True, 0, False);
st->gc = XCreateGC (st->dpy, st->window, 0, &gcv);
st->delay = get_integer_resource (dpy, "delay", "Integer");
st->nwaves = get_integer_resource (dpy, "nwaves", "Integer");
st->waves = (wave *) calloc (st->nwaves, sizeof(*st->waves));
for (i = 0; i < st->nwaves; i++)
{
st->waves[i].scale = frand(0.03) + 0.005;
st->waves[i].offset = frand(M_PI);
st->waves[i].delta = (BELLRAND(2)-1) / 15.0;
}
return st;
}
static unsigned long
cwaves_draw (Display *dpy, Window window, void *closure)
{
state *st = (state *) closure;
int i, x;
for (i = 0; i < st->nwaves; i++)
st->waves[i].offset += st->waves[i].delta;
for (x = 0; x < st->xgwa.width; x += st->scale)
{
double v = 0;
int j;
for (i = 0; i < st->nwaves; i++)
v += cos ((x * st->waves[i].scale) - st->waves[i].offset);
v /= st->nwaves;
j = st->ncolors * (v/2 + 0.5);
if (j < 0 || j >= st->ncolors) abort();
XSetForeground (st->dpy, st->gc, st->colors[j].pixel);
XFillRectangle (st->dpy, st->window, st->gc,
x, 0, st->scale, st->xgwa.height);
}
if (st->debug_p)
{
int wh = (st->xgwa.height / (st->nwaves + 1)) * 0.9;
int i;
XSetLineAttributes (st->dpy, st->gc, 2, LineSolid, CapRound, JoinRound);
XSetForeground (st->dpy, st->gc, BlackPixelOfScreen (st->xgwa.screen));
for (i = 0; i < st->nwaves; i++)
{
int y = st->xgwa.height * i / (st->nwaves + 1);
int ox = -1, oy = -1;
for (x = 0; x < st->xgwa.width; x += st->scale)
{
int yy;
double v = 0;
v = cos ((x * st->waves[i].scale) - st->waves[i].offset);
v /= 2;
yy = y + wh/2 + (wh * v);
if (ox == -1)
ox = x, oy = yy;
XDrawLine (st->dpy, st->window, st->gc, ox, oy, x, yy);
ox = x;
oy = yy;
}
}
{
int y = st->xgwa.height * i / (st->nwaves + 1);
int ox = -1, oy = -1;
for (x = 0; x < st->xgwa.width; x += st->scale)
{
int yy;
double v = 0;
for (i = 0; i < st->nwaves; i++)
v += cos ((x * st->waves[i].scale) - st->waves[i].offset);
v /= st->nwaves;
v /= 2;
yy = y + wh/2 + (wh * v);
if (ox == -1)
ox = x, oy = yy;
XDrawLine (st->dpy, st->window, st->gc, ox, oy, x, yy);
ox = x;
oy = yy;
}
}
}
return st->delay;
}
static void
cwaves_reshape (Display *dpy, Window window, void *closure,
unsigned int w, unsigned int h)
{
state *st = (state *) closure;
XGetWindowAttributes (st->dpy, st->window, &st->xgwa);
}
static Bool
cwaves_event (Display *dpy, Window window, void *closure, XEvent *event)
{
state *st = (state *) closure;
if (screenhack_event_helper (dpy, window, event))
{
make_smooth_colormap (st->xgwa.screen, st->xgwa.visual,
st->xgwa.colormap,
st->colors, &st->ncolors,
True, 0, False);
return True;
}
return False;
}
static void
cwaves_free (Display *dpy, Window window, void *closure)
{
}
static const char *cwaves_defaults [] = {
".background: black",
".foreground: white",
"*ncolors: 600",
"*nwaves: 15",
"*scale: 2",
"*debug: False",
"*delay: 20000",
#ifdef HAVE_MOBILE
"*ignoreRotation: True",
#endif
0
};
static XrmOptionDescRec cwaves_options [] = {
{ "-delay", ".delay", XrmoptionSepArg, 0 },
{ "-waves", ".nwaves", XrmoptionSepArg, 0 },
{ "-colors", ".ncolors", XrmoptionSepArg, 0 },
{ "-scale", ".scale", XrmoptionSepArg, 0 },
{ "-debug", ".debug", XrmoptionNoArg, "True" },
{ 0, 0, 0, 0 }
};
XSCREENSAVER_MODULE ("CWaves", cwaves)
