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/* -*- Mode: C; tab-width: 4 -*- */
/* vines --- vine fractals */
#if !defined( lint ) && !defined( SABER )
static const char sccsid[] = "@(#)vines.c 4.07 97/11/24 xlockmore";
#endif
/*-
* Copyright (c) 1997 by Tracy Camp campt@hurrah.com
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation.
*
* This file is provided AS IS with no warranties of any kind. The author
* shall have no liability with respect to the infringement of copyrights,
* trade secrets or any patents by this file or any part thereof. In no
* event will the author be liable for any lost revenue or profits or
* other special, indirect and consequential damages.
*
* If you make a modification I would of course appreciate a copy.
*
* Revision History:
* 11-Jul-97: David Hansen <dhansen@metapath.com>
* Changed names to vines and modified draw loop
* to honor batchcount so vines can be grown or
* plotted.
* 10-May-97: Compatible with xscreensaver
* 21-Mar-97: David Hansen <dhansen@metapath.com>
* Updated mode to draw complete patterns on every
* iteration instead of growing the vine. Also made
* adjustments to randomization and changed variable
* names to make logic easier to follow.
*/
/*-
* This was modifed from a 'screen saver' that a friend and I
* wrote on our TI-8x calculators in high school physics one day
* Basically another geometric pattern generator, this ones claim
* to fame is a pseudo-fractal looking vine like pattern that creates
* nifty whorls and loops.
*/
#ifdef STANDALONE
#define PROGCLASS "Vines"
#define HACK_INIT init_vines
#define HACK_DRAW draw_vines
#define vines_opts xlockmore_opts
#define DEFAULTS "*delay: 200000 \n" \
"*count: 0 \n" \
"*ncolors: 64 \n" \
"*eraseSpeed: 400 \n" \
"*eraseMode: -1 \n"
#include "xlockmore.h" /* in xscreensaver distribution */
#else /* STANDALONE */
#include "xlock.h" /* in xlockmore distribution */
#endif /* STANDALONE */
ModeSpecOpt vines_opts =
{0, NULL, 0, NULL, NULL};
#ifdef USE_MODULES
ModStruct vines_description =
{"vines", "init_vines", "draw_vines", "release_vines",
"refresh_vines", "init_vines", NULL, &vines_opts,
200000, 0, 1, 1, 64, 1.0, "",
"Shows fractals", 0, NULL};
#endif
typedef struct {
int a;
int x1;
int y1;
int x2;
int y2;
int i;
int length;
int iterations;
int constant;
int ang;
int centerx;
int centery;
} vinestruct;
static vinestruct *vines = NULL;
void
refresh_vines(ModeInfo * mi)
{
MI_CLEARWINDOW(mi);
} /* refresh_vines */
void
init_vines(ModeInfo * mi)
{
vinestruct *fp;
if (vines == NULL) {
if ((vines = (vinestruct *) calloc(MI_NUM_SCREENS(mi),
sizeof (vinestruct))) == NULL) {
return;
}
}
fp = &vines[MI_SCREEN(mi)];
fp->i = 0;
fp->length = 0;
fp->iterations = 30 + NRAND(100);
MI_CLEARWINDOW(mi);
} /* init_vines */
void
draw_vines(ModeInfo * mi)
{
vinestruct *fp = &vines[MI_SCREEN(mi)];
Display *display = MI_DISPLAY(mi);
GC gc = MI_GC(mi);
int count;
MI_IS_DRAWN(mi) = True;
if (fp->i >= fp->length) {
if (--(fp->iterations) == 0) {
init_vines(mi);
}
fp->centerx = NRAND(MI_WIDTH(mi));
fp->centery = NRAND(MI_HEIGHT(mi));
fp->ang = 60 + NRAND(720);
fp->length = 100 + NRAND(3000);
fp->constant = fp->length * (10 + NRAND(10));
fp->i = 0;
fp->a = 0;
fp->x1 = 0;
fp->y1 = 0;
fp->x2 = 1;
fp->y2 = 0;
if (MI_NPIXELS(mi) > 2)
XSetForeground(display, gc, MI_PIXEL(mi, NRAND(MI_NPIXELS(mi))));
else
XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
}
count = fp->i + MI_COUNT(mi);
if ((count <= fp->i) || (count > fp->length))
count = fp->length;
while (fp->i < count) {
XDrawLine(display, MI_WINDOW(mi), gc,
fp->centerx + (fp->x1 / fp->constant),
fp->centery - (fp->y1 / fp->constant),
fp->centerx + (fp->x2 / fp->constant),
fp->centery - (fp->y2 / fp->constant));
fp->a += (fp->ang * fp->i);
fp->x1 = fp->x2;
fp->y1 = fp->y2;
fp->x2 += (int) (fp->i * ((cos(fp->a) * 360) / (2 * M_PI)));
fp->y2 += (int) (fp->i * ((sin(fp->a) * 360) / (2 * M_PI)));
fp->i++;
}
} /* draw_vines */
void
release_vines(ModeInfo * mi)
{
if (vines != NULL) {
(void) free((void *) vines);
vines = NULL;
}
} /* release_vines */
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