ENTRYPOINT void
release_fadeplot (ModeInfo * mi)
{
if (fadeplots != NULL) {
int screen;
for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++)
free_fadeplot(&fadeplots[screen]);
(void) free((void *) fadeplots);
fadeplots = (fadeplotstruct *) NULL;
}
}
ENTRYPOINT void
init_fadeplot (ModeInfo * mi)
{
fadeplotstruct *fp;
if (fadeplots == NULL) {
if ((fadeplots = (fadeplotstruct *) calloc(MI_NUM_SCREENS(mi),
sizeof (fadeplotstruct))) == NULL)
return;
}
fp = &fadeplots[MI_SCREEN(mi)];
fp->width = MI_WIDTH(mi);
fp->height = MI_HEIGHT(mi);
fp->min = MAX(MIN(fp->width, fp->height) / 2, 1);
fp->speed.x = 8;
fp->speed.y = 10;
fp->step.x = 1;
fp->step.y = 1;
fp->temps = 0;
fp->factor.x = MAX(fp->width / (2 * fp->min), 1);
fp->factor.y = MAX(fp->height / (2 * fp->min), 1);
fp->nbstep = MI_COUNT(mi);
if (fp->nbstep < -MINSTEPS) {
fp->nbstep = NRAND(-fp->nbstep - MINSTEPS + 1) + MINSTEPS;
} else if (fp->nbstep < MINSTEPS)
fp->nbstep = MINSTEPS;
fp->maxpts = MI_CYCLES(mi);
if (fp->maxpts < 1)
fp->maxpts = 1;
if (fp->pts == NULL) {
if ((fp->pts = (XPoint *) calloc(fp->maxpts, sizeof (XPoint))) ==
NULL) {
free_fadeplot(fp);
return;
}
}
if (MI_NPIXELS(mi) > 2)
fp->pix = NRAND(MI_NPIXELS(mi));
if (fp->stab != NULL)
(void) free((void *) fp->stab);
if (!initSintab(mi))
return;
MI_CLEARWINDOW(mi);
}
static Bool
initSintab(ModeInfo * mi)
{
fadeplotstruct *fp = &fadeplots[MI_SCREEN(mi)];
int i;
float x;
fp->angles = NRAND(950) + 250;
if ((fp->stab = (int *) malloc(fp->angles * sizeof (int))) == NULL) {
free_fadeplot(mi);
return False;
}
for (i = 0; i < fp->angles; i++) {
x = SINF(2.0 * M_PI * i / fp->angles);
fp->stab[i] = (int) (x * ABS(x) * fp->min) + fp->min;
}
return True;
}
