-/* -*- Mode: C; tab-width: 4 -*-
- * tri --- Sierpinski triangle fractal.
- */
+/* -*- Mode: C; tab-width: 4 -*- */
+/* sierpinski --- Sierpinski's triangle fractal */
+
#if !defined( lint ) && !defined( SABER )
-static const char sccsid[] = "@(#)tri.c 4.00 97/01/01 xlockmore";
+static const char sccsid[] = "@(#)sierpinski.c 4.05 97/09/19 xlockmore";
#endif
-/* Copyright (c) 1988-91 by Patrick J. Naughton.
+/* 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,
* other special, indirect and consequential damages.
*
* Revision History:
- * 10-May-97: jwz@netscape.com: turned into a standalone program.
+ * 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_tri
-# define HACK_DRAW draw_tri
-# define tri_opts xlockmore_opts
-# define DEFAULTS "*count: 2000 \n" \
+# 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" \
- "*delay: 400000 \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 tri_opts = {
- 0, NULL, 0, NULL, NULL };
+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 npoints[3];
- unsigned long colors[3];
- XPoint *pointBuffer[3];
- XPoint vertex[3];
-} tristruct;
+ int corners;
+ int npoints[MAXCORNERS];
+ unsigned long colors[MAXCORNERS];
+ XPoint *pointBuffer[MAXCORNERS];
+ XPoint vertex[MAXCORNERS];
+} sierpinskistruct;
-static tristruct *tris = NULL;
+static sierpinskistruct *tris = NULL;
static void
startover(ModeInfo * mi)
{
int j;
- tristruct *tp = &tris[MI_SCREEN(mi)];
+ sierpinskistruct *sp = &tris[MI_SCREEN(mi)];
if (MI_NPIXELS(mi) > 2) {
- tp->colors[0] = (NRAND(MI_NPIXELS(mi)));
- tp->colors[1] = (tp->colors[0] + MI_NPIXELS(mi) / 7 +
- NRAND(2 * MI_NPIXELS(mi) / 7)) % MI_NPIXELS(mi);
- tp->colors[2] = (tp->colors[0] + 4 * MI_NPIXELS(mi) / 7 +
- NRAND(2 * MI_NPIXELS(mi) / 7)) % MI_NPIXELS(mi);
+ 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 < 3; j++) {
- tp->vertex[j].x = NRAND(tp->width);
- tp->vertex[j].y = NRAND(tp->height);
+ for (j = 0; j < sp->corners; j++) {
+ sp->vertex[j].x = NRAND(sp->width);
+ sp->vertex[j].y = NRAND(sp->height);
}
- tp->px = NRAND(tp->width);
- tp->py = NRAND(tp->height);
- tp->time = 0;
+ sp->px = NRAND(sp->width);
+ sp->py = NRAND(sp->height);
+ sp->time = 0;
XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
}
void
-init_tri(ModeInfo * mi)
+init_sierpinski(ModeInfo * mi)
{
- tristruct *tp;
+ sierpinskistruct *sp;
int i;
if (tris == NULL) {
- if ((tris = (tristruct *) calloc(MI_NUM_SCREENS(mi),
- sizeof (tristruct))) == NULL)
+ if ((tris = (sierpinskistruct *) calloc(MI_NUM_SCREENS(mi),
+ sizeof (sierpinskistruct))) == NULL)
return;
}
- tp = &tris[MI_SCREEN(mi)];
+ sp = &tris[MI_SCREEN(mi)];
- tp->width = MI_WIN_WIDTH(mi);
- tp->height = MI_WIN_HEIGHT(mi);
+ sp->width = MI_WIN_WIDTH(mi);
+ sp->height = MI_WIN_HEIGHT(mi);
- tp->total_npoints = MI_BATCHCOUNT(mi);
- if (tp->total_npoints < 1)
- tp->total_npoints = 1;
- for (i = 0; i < 3; i++) {
- if (!tp->pointBuffer[i])
- tp->pointBuffer[i] = (XPoint *) malloc(tp->total_npoints *
+ 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_tri(ModeInfo * mi)
+draw_sierpinski(ModeInfo * mi)
{
Display *display = MI_DISPLAY(mi);
GC gc = MI_GC(mi);
- tristruct *tp = &tris[MI_SCREEN(mi)];
- XPoint *xp[3];
+ 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 < 3; i++)
- xp[i] = tp->pointBuffer[i];
- for (i = 0; i < tp->total_npoints; i++) {
- v = NRAND(3);
- tp->px = (tp->px + tp->vertex[v].x) / 2;
- tp->py = (tp->py + tp->vertex[v].y) / 2;
- xp[v]->x = tp->px;
- xp[v]->y = tp->py;
+ 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]++;
- tp->npoints[v]++;
+ sp->npoints[v]++;
}
- for (i = 0; i < 3; i++) {
+ for (i = 0; i < sp->corners; i++) {
if (MI_NPIXELS(mi) > 2)
- XSetForeground(display, gc, MI_PIXEL(mi, tp->colors[i]));
- XDrawPoints(display, MI_WINDOW(mi), gc, tp->pointBuffer[i], tp->npoints[i],
+ XSetForeground(display, gc, MI_PIXEL(mi, sp->colors[i]));
+ XDrawPoints(display, MI_WINDOW(mi), gc, sp->pointBuffer[i], sp->npoints[i],
CoordModeOrigin);
- tp->npoints[i] = 0;
+ sp->npoints[i] = 0;
}
- if (++tp->time >= MI_CYCLES(mi))
+ if (++sp->time >= MI_CYCLES(mi))
startover(mi);
}
void
-release_tri(ModeInfo * mi)
+release_sierpinski(ModeInfo * mi)
{
if (tris != NULL) {
int screen, i;
for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
- for (i = 0; i < 3; i++)
+ for (i = 0; i < MAXCORNERS; i++)
if (tris[screen].pointBuffer[i] != NULL) {
(void) free((void *) tris[screen].pointBuffer[i]);
}
}
void
-refresh_tri(ModeInfo * mi)
+refresh_sierpinski(ModeInfo * mi)
{
/* Do nothing, it will refresh by itself */
}
projects / xscreensaver / blobdiff