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/*
* floatbg.c
* author: Jan Rekers
* purpose: This program slowly changes the color of the root window of X.
*/
#include <X11/Xlib.h>
#include <stdio.h>
#define MaxColor 0xffff
#define MaxTime 0x7fff
#define pi 3.1415926535
#define default_sf_in_hf .25
#define default_s_mid .375
#define default_s_var .125
#define default_v_val .87
char *program_name;
Display *dpy;
int screen;
Window root;
struct hsv { float h,s,v; };
struct rgb { float r,g,b; };
void hsv2rgb(), ticks2hsv();
float sf_in_hf = default_sf_in_hf;
float s_mid = default_s_mid;
float s_var = default_s_var;
float v_val = default_v_val;
unsigned long GetMutableColor();
void SetColor();
long time(), random();
double atof();
usage()
{
fprintf(stderr, "usage: %s [options]\n", program_name);
fprintf(stderr, " where options are:\n");
fprintf(stderr, " -display <display> or -d <display>\n");
fprintf(stderr, " -help\n");
fprintf(stderr, " -value <float> (default %1.2f)\n", default_v_val);
fprintf(stderr, " -satmid <float> (default %1.3f)\n", default_s_mid);
fprintf(stderr, " -satvar <float> (default %1.3f)\n", default_s_var);
fprintf(stderr, " -fase <float> (default %1.2f)\n", default_sf_in_hf);
fprintf(stderr, " value, (satmid-satvar) and (satmid+satvar) must be between 0 and 1\n");
exit(1);
}
main(argc, argv)
int argc;
char **argv;
{
char *display_name = NULL;
unsigned long cmapentry;
register int ticks;
int i;
struct hsv hsv;
struct rgb rgb;
extern char *optarg;
program_name=argv[0];
for (i = 1; i < argc; i++) {
if (!strcmp ("-display", argv[i]) || !strcmp ("-d", argv[i])) {
if (++i>=argc) usage ();
display_name = argv[i];
continue;
}
if (!strcmp("-help", argv[i])) {
usage();
}
if (!strcmp("-value", argv[i])) {
if (++i>=argc) usage();
v_val = atof(argv[i]);
continue;
}
if (!strcmp("-satmid", argv[i])) {
if (++i>=argc) usage();
s_mid = atof(argv[i]);
continue;
}
if (!strcmp("-satvar", argv[i])) {
if (++i>=argc) usage();
s_var = atof(argv[i]);
continue;
}
if (!strcmp("-fase", argv[i])) {
if (++i>=argc) usage();
sf_in_hf = atof(argv[i]);
continue;
}
usage();
}
if ( (v_val < 0) || (v_val > 1) ) usage();
if ( ((s_mid - s_var) < 0) || ((s_mid + s_var) > 1) ) usage();
dpy = XOpenDisplay(display_name);
if (!dpy) {
fprintf(stderr, "%s: unable to open display '%s'\n",
program_name, XDisplayName (display_name));
exit(1);
}
screen = DefaultScreen(dpy);
root = RootWindow(dpy, screen);
srandom( (int)time(0L) );
ticks = (int)random() % MaxTime;
cmapentry = GetMutableColor();
XSetWindowBackground(dpy, root, cmapentry);
XClearWindow(dpy, root);
while ( 1 ) {
ticks2hsv(ticks, &hsv);
hsv2rgb(&hsv, &rgb);
SetColor(cmapentry, &rgb);
XFlush(dpy);
ticks = ticks++ % MaxTime;
sleep(10);
}
}
unsigned long GetMutableColor ()
{
XColor color;
if (XAllocColorCells (dpy, DefaultColormap(dpy,screen),
0, 0, 0, &color.pixel, 1) == NULL) {
fprintf(stderr, "%s: unable to allocate colorcells\n", program_name);
exit(1); }
return(color.pixel);
}
void SetColor (pixel, rgb)
unsigned long pixel;
struct rgb *rgb;
{
XColor color;
int red = (int) MaxColor * rgb->r;
int green = (int) MaxColor * rgb->g;
int blue = (int) MaxColor * rgb->b;
color.red = red; color.green = green; color.blue = blue;
color.pixel = pixel;
color.flags = DoRed|DoGreen|DoBlue;
XStoreColor(dpy, DefaultColormap(dpy,screen), &color);
}
void ticks2hsv (ticks, hsv)
int ticks;
struct hsv *hsv;
{
float s_fase, sin();
hsv->h = ticks % 360;
s_fase = sf_in_hf * (pi / 180) * ticks;
hsv->s = s_mid - (s_var * sin(s_fase));
hsv->v = v_val;
}
void hsv2rgb (hsv, rgb)
struct hsv *hsv;
struct rgb *rgb;
{
int i;
float f, p, q, r, h, v;
v = hsv->v;
if (hsv->s == 0) {
rgb->r = v; rgb->g = v; rgb->b = v; }
else {
h = hsv->h / 60;
i = (int) h;
f = h - i;
p = hsv->v * (1 - hsv->s);
q = hsv->v * (1 - (hsv->s * f));
r = hsv->v * (1 - (hsv->s * (1 - f)));
switch (i) {
case 0: rgb->r = v; rgb->g = r; rgb->b = p; break;
case 1: rgb->r = q; rgb->g = v; rgb->b = p; break;
case 2: rgb->r = p; rgb->g = v; rgb->b = r; break;
case 3: rgb->r = p; rgb->g = q; rgb->b = v; break;
case 4: rgb->r = r; rgb->g = p; rgb->b = v; break;
case 5: rgb->r = v; rgb->g = p; rgb->b = q; break;
}
}
}
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