+++ /dev/null
-/* -*- Mode: C; tab-width: 4 -*- */
-/* sierpinski --- Sierpinski's triangle fractal */
-
-#if !defined( lint ) && !defined( SABER )
-static const char sccsid[] = "@(#)sierpinski.c 4.05 97/09/19 xlockmore";
-#endif
-
-/* Copyright (c) 1996 by Desmond Daignault
- *
- * 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.
- *
- * Revision History:
- * 18-Sep-97: 3D version Antti Kuntsi <kuntsi@iki.fi>.
- * 20-May-97: Changed the name tri to sierpinski for more compatiblity
- * 10-May-97: jwz@jwz.org: turned into a standalone program.
- * 05-Sep-96: Desmond Daignault Datatimes Incorporated
- * <tekdd@dtol.datatimes.com> .
- */
-
-#ifdef STANDALONE
-# define PROGCLASS "Sierpinski"
-# define HACK_INIT init_sierpinski
-# define HACK_DRAW draw_sierpinski
-# define sierpinski_opts xlockmore_opts
-# define DEFAULTS "*delay: 400000 \n" \
- "*count: 2000 \n" \
- "*cycles: 100 \n" \
- "*ncolors: 64 \n"
-# define BRIGHT_COLORS
-# include "xlockmore.h" /* from the xscreensaver distribution */
-#else /* !STANDALONE */
-# include "xlock.h" /* from the xlockmore distribution */
-#endif /* !STANDALONE */
-
-ModeSpecOpt sierpinski_opts =
-{0, NULL, 0, NULL, NULL};
-
-#define MAXCORNERS 4
-
-typedef struct {
- int width, height;
- int time;
- int px, py;
- int total_npoints;
- int corners;
- int npoints[MAXCORNERS];
- unsigned long colors[MAXCORNERS];
- XPoint *pointBuffer[MAXCORNERS];
- XPoint vertex[MAXCORNERS];
-} sierpinskistruct;
-
-static sierpinskistruct *tris = NULL;
-
-static void
-startover(ModeInfo * mi)
-{
- int j;
- sierpinskistruct *sp = &tris[MI_SCREEN(mi)];
-
- if (MI_NPIXELS(mi) > 2) {
- if (sp->corners == 3) {
- sp->colors[0] = (NRAND(MI_NPIXELS(mi)));
- sp->colors[1] = (sp->colors[0] + MI_NPIXELS(mi) / 7 +
- NRAND(2 * MI_NPIXELS(mi) / 7 + 1)) % MI_NPIXELS(mi);
- sp->colors[2] = (sp->colors[0] + 4 * MI_NPIXELS(mi) / 7 +
- NRAND(2 * MI_NPIXELS(mi) / 7 + 1)) % MI_NPIXELS(mi);
- } else if (sp->corners == 4) {
- sp->colors[0] = (NRAND(MI_NPIXELS(mi)));
- sp->colors[1] = (sp->colors[0] + MI_NPIXELS(mi) / 7 +
- NRAND(MI_NPIXELS(mi) / 7 + 1)) % MI_NPIXELS(mi);
- sp->colors[2] = (sp->colors[0] + 3 * MI_NPIXELS(mi) / 7 +
- NRAND(MI_NPIXELS(mi) / 7 + 1)) % MI_NPIXELS(mi);
- sp->colors[3] = (sp->colors[0] + 5 * MI_NPIXELS(mi) / 7 +
- NRAND(MI_NPIXELS(mi) / 7 + 1)) % MI_NPIXELS(mi);
- } else {
- (void) fprintf(stderr, "colors not set for %d corners\n", sp->corners);
- }
- }
- for (j = 0; j < sp->corners; j++) {
- sp->vertex[j].x = NRAND(sp->width);
- sp->vertex[j].y = NRAND(sp->height);
- }
- sp->px = NRAND(sp->width);
- sp->py = NRAND(sp->height);
- sp->time = 0;
- XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
-}
-
-void
-init_sierpinski(ModeInfo * mi)
-{
- sierpinskistruct *sp;
- int i;
-
- if (tris == NULL) {
- if ((tris = (sierpinskistruct *) calloc(MI_NUM_SCREENS(mi),
- sizeof (sierpinskistruct))) == NULL)
- return;
- }
- sp = &tris[MI_SCREEN(mi)];
-
- sp->width = MI_WIN_WIDTH(mi);
- sp->height = MI_WIN_HEIGHT(mi);
-
- sp->total_npoints = MI_BATCHCOUNT(mi);
- if (sp->total_npoints < 1)
- sp->total_npoints = 1;
- sp->corners = MI_SIZE(mi);
- if (sp->corners < 3 || sp->corners > 4) {
- sp->corners = (LRAND() & 1) + 3;
- }
- for (i = 0; i < sp->corners; i++) {
- if (!sp->pointBuffer[i])
- sp->pointBuffer[i] = (XPoint *) malloc(sp->total_npoints *
- sizeof (XPoint));
- }
- startover(mi);
-}
-
-void
-draw_sierpinski(ModeInfo * mi)
-{
- Display *display = MI_DISPLAY(mi);
- GC gc = MI_GC(mi);
- sierpinskistruct *sp = &tris[MI_SCREEN(mi)];
- XPoint *xp[MAXCORNERS];
- int i = 0, v;
-
- if (MI_NPIXELS(mi) <= 2)
- XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
- for (i = 0; i < sp->corners; i++)
- xp[i] = sp->pointBuffer[i];
- for (i = 0; i < sp->total_npoints; i++) {
- v = NRAND(sp->corners);
- sp->px = (sp->px + sp->vertex[v].x) / 2;
- sp->py = (sp->py + sp->vertex[v].y) / 2;
- xp[v]->x = sp->px;
- xp[v]->y = sp->py;
- xp[v]++;
- sp->npoints[v]++;
- }
- for (i = 0; i < sp->corners; i++) {
- if (MI_NPIXELS(mi) > 2)
- XSetForeground(display, gc, MI_PIXEL(mi, sp->colors[i]));
- XDrawPoints(display, MI_WINDOW(mi), gc, sp->pointBuffer[i], sp->npoints[i],
- CoordModeOrigin);
- sp->npoints[i] = 0;
- }
- if (++sp->time >= MI_CYCLES(mi))
- startover(mi);
-}
-
-void
-release_sierpinski(ModeInfo * mi)
-{
- if (tris != NULL) {
- int screen, i;
-
- for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
- for (i = 0; i < MAXCORNERS; i++)
- if (tris[screen].pointBuffer[i] != NULL) {
- (void) free((void *) tris[screen].pointBuffer[i]);
- }
- }
- (void) free((void *) tris);
- tris = NULL;
- }
-}
-
-void
-refresh_sierpinski(ModeInfo * mi)
-{
- /* Do nothing, it will refresh by itself */
-}
projects / xscreensaver / blobdiff