C++ (Cpp) INTRAND Examples

Example #1

File: lissie.c Project: sev-/xscreensaver

static void
initlissie(ModeInfo * mi, lissiestruct * lissie)
{
	lissstruct *lp = &lisses[MI_SCREEN(mi)];
	int         size = MI_SIZE(mi);
	int         i;

	if (MI_NPIXELS(mi) > 2)
		lissie->color = NRAND(MI_NPIXELS(mi));
	else
		lissie->color = MI_WHITE_PIXEL(mi);
	/* Initialize parameters */
	if (size < -MINSIZE)
		lissie->ri = NRAND(MIN(-size, MAX(MINSIZE,
		   MIN(lp->width, lp->height) / 4)) - MINSIZE + 1) + MINSIZE;
	else if (size < MINSIZE) {
		if (!size)
			lissie->ri = MAX(MINSIZE, MIN(lp->width, lp->height) / 4);
		else
			lissie->ri = MINSIZE;
	} else
		lissie->ri = MIN(size, MAX(MINSIZE, MIN(lp->width, lp->height) / 4));
	lissie->xi = INTRAND(lp->width / 4 + lissie->ri,
			     lp->width * 3 / 4 - lissie->ri);
	lissie->yi = INTRAND(lp->height / 4 + lissie->ri,
			     lp->height * 3 / 4 - lissie->ri);
	lissie->rx = INTRAND(lp->width / 4,
		   MIN(lp->width - lissie->xi, lissie->xi)) - 2 * lissie->ri;
	lissie->ry = INTRAND(lp->height / 4,
		  MIN(lp->height - lissie->yi, lissie->yi)) - 2 * lissie->ri;
	lissie->len = INTRAND(MINLISSIELEN, MAXLISSIELEN - 1);
	lissie->pos = 0;

	lissie->redrawing = 0;

	lissie->tx = FLOATRAND(0, 2 * M_PI);
	lissie->ty = FLOATRAND(0, 2 * M_PI);
	lissie->dtx = FLOATRAND(MINDT, MAXDT);
	lissie->dty = FLOATRAND(MINDT, MAXDT);

	for (i = 0; i < MAXLISSIELEN; i++)
		lissie->loc[i].x = lissie->loc[i].y = 0;
	/* Draw lissie */
	drawlissie(mi, lissie);
}

Example #2

File: braid.c Project: HorseloverFat/xscreensaver

ENTRYPOINT void
init_braid(ModeInfo * mi)
{
	braidtype  *braid;
	int         used[MAXSTRANDS];
	int         i, count, comp, c;
	float       min_length;

	if (braids == NULL) {
		if ((braids = (braidtype *) calloc(MI_NUM_SCREENS(mi),
						sizeof (braidtype))) == NULL)
			return;
	}
	braid = &braids[MI_SCREEN(mi)];

	braid->center_x = MI_WIDTH(mi) / 2;
	braid->center_y = MI_HEIGHT(mi) / 2;
	braid->age = 0;

	/* jwz: go in the other direction sometimes. */
	braid->color_direction = ((LRAND() & 1) ? 1 : -1);

#ifndef STANDALONE
	MI_CLEARWINDOW(mi);
#endif

	min_length = (braid->center_x > braid->center_y) ?
		braid->center_y : braid->center_x;
	braid->min_radius = min_length * 0.30;
	braid->max_radius = min_length * 0.90;

	if (MI_COUNT(mi) < MINSTRANDS)
		braid->nstrands = MINSTRANDS;
	else
		braid->nstrands = INTRAND(MINSTRANDS,
				       MAX(MIN(MIN(MAXSTRANDS, MI_COUNT(mi)),
					       (int) ((braid->max_radius - braid->min_radius) / 5.0)), MINSTRANDS));
	braid->braidlength = INTRAND(MINLENGTH, MIN(MAXLENGTH, braid->nstrands * 6));

	for (i = 0; i < braid->braidlength; i++) {
		braid->braidword[i] =
			INTRAND(1, braid->nstrands - 1) * (INTRAND(1, 2) * 2 - 3);
		if (i > 0)
			while (braid->braidword[i] == -braid->braidword[i - 1])
				braid->braidword[i] = INTRAND(1, braid->nstrands - 1) * (INTRAND(1, 2) * 2 - 3);
	}

	while (braid->braidword[0] == -braid->braidword[braid->braidlength - 1])
		braid->braidword[braid->braidlength - 1] =
			INTRAND(1, braid->nstrands - 1) * (INTRAND(1, 2) * 2 - 3);

	do {
		(void) memset((char *) used, 0, sizeof (used));
		count = 0;
		for (i = 0; i < braid->braidlength; i++)
			used[ABS(braid->braidword[i])]++;
		for (i = 0; i < braid->nstrands; i++)
			count += (used[i] > 0) ? 1 : 0;
		if (count < braid->nstrands - 1) {
			braid->braidword[braid->braidlength] =
				INTRAND(1, braid->nstrands - 1) * (INTRAND(1, 2) * 2 - 3);
			while (braid->braidword[braid->braidlength] ==
			       -braid->braidword[braid->braidlength - 1] &&
			       braid->braidword[0] == -braid->braidword[braid->braidlength])
				braid->braidword[braid->braidlength] =
					INTRAND(1, braid->nstrands - 1) * (INTRAND(1, 2) * 2 - 3);
			braid->braidlength++;
		}
	} while (count < braid->nstrands - 1 && braid->braidlength < MAXLENGTH);

	braid->startcolor = (MI_NPIXELS(mi) > 2) ?
		(float) NRAND(MI_NPIXELS(mi)) : 0.0;
	/* XSetLineAttributes (display, MI_GC(mi), 2, LineSolid, CapRound,
	   JoinRound); */

	(void) memset((char *) braid->components, 0, sizeof (braid->components));
	c = 1;
	comp = 0;
	braid->components[0] = 1;
	do {
		i = comp;
		do {
			i = applyword(braid, i, 0);
			braid->components[i] = braid->components[comp];
		} while (i != comp);
		count = 0;
		for (i = 0; i < braid->nstrands; i++)
			if (braid->components[i] == 0)
				count++;
		if (count > 0) {
			for (comp = 0; braid->components[comp] != 0; comp++);
			braid->components[comp] = ++c;
		}
	} while (count > 0);

	braid->linewidth = MI_SIZE(mi);

	if (braid->linewidth < 0)
		braid->linewidth = NRAND(-braid->linewidth) + 1;
	if (braid->linewidth * braid->linewidth * 8 > MIN(MI_WIDTH(mi), MI_HEIGHT(mi)))
       braid->linewidth = MIN(1, (int) sqrt((double) MIN(MI_WIDTH(mi), MI_HEIGHT(mi)) / 8));
	for (i = 0; i < braid->nstrands; i++)
		if (!(braid->components[i] & 1))
			braid->components[i] *= -1;
}