/* sierpinski --- Sierpinski's triangle fractal */
#if !defined( lint ) && !defined( SABER )
-static const char sccsid[] = "@(#)sierpinski.c 4.05 97/09/19 xlockmore";
+static const char sccsid[] = "@(#)sierpinski.c 5.00 2000/11/01 xlockmore";
+
#endif
-/* Copyright (c) 1996 by Desmond Daignault
+/*-
+ * 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,
* event will the author be liable for any lost revenue or profits or
* other special, indirect and consequential damages.
*
+ * Dots initially appear where they "should not". Later they get
+ * "focused". This is correct behavior.
+ *
* 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
+ * 01-Nov-2000: Allocation checks
+ * 18-Sep-1997: 3D version Antti Kuntsi <kuntsi@iki.fi>.
+ * 20-May-1997: Changed the name tri to sierpinski for more compatiblity
+ * 10-May-1997: Jamie Zawinski <jwz@jwz.org> compatible with xscreensaver
+ * 05-Sep-1996: 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 */
+#define MODE_sierpinski
+#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" /* in xscreensaver distribution */
+#else /* STANDALONE */
+#include "xlock.h" /* in xlockmore distribution */
+#endif /* STANDALONE */
+
+#ifdef MODE_sierpinski
ModeSpecOpt sierpinski_opts =
-{0, NULL, 0, NULL, NULL};
+{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
+
+#ifdef USE_MODULES
+ModStruct sierpinski_description =
+{"sierpinski", "init_sierpinski", "draw_sierpinski", "release_sierpinski",
+ "refresh_sierpinski", "init_sierpinski", (char *) NULL, &sierpinski_opts,
+ 400000, 2000, 100, 1, 64, 1.0, "",
+ "Shows Sierpinski's triangle", 0, NULL};
+
+#endif
#define MAXCORNERS 4
int time;
int px, py;
int total_npoints;
- int corners;
+ int corners;
int npoints[MAXCORNERS];
unsigned long colors[MAXCORNERS];
XPoint *pointBuffer[MAXCORNERS];
XPoint vertex[MAXCORNERS];
} sierpinskistruct;
-static sierpinskistruct *tris = NULL;
+static sierpinskistruct *tris = (sierpinskistruct *) NULL;
static void
startover(ModeInfo * mi)
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 +
+ 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 +
+ 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);
- }
+ } 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->px = NRAND(sp->width);
sp->py = NRAND(sp->height);
sp->time = 0;
- XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
+
+ MI_CLEARWINDOW(mi);
+}
+
+static void
+free_sierpinski(sierpinskistruct *sp)
+{
+ int corner;
+
+ for (corner = 0; corner < MAXCORNERS; corner++)
+ if (sp->pointBuffer[corner] != NULL) {
+ (void) free((void *) sp->pointBuffer[corner]);
+ sp->pointBuffer[corner] = (XPoint *) NULL;
+ }
}
void
init_sierpinski(ModeInfo * mi)
{
- sierpinskistruct *sp;
int i;
+ sierpinskistruct *sp;
if (tris == NULL) {
if ((tris = (sierpinskistruct *) calloc(MI_NUM_SCREENS(mi),
}
sp = &tris[MI_SCREEN(mi)];
- sp->width = MI_WIN_WIDTH(mi);
- sp->height = MI_WIN_HEIGHT(mi);
+ sp->width = MI_WIDTH(mi);
+ sp->height = MI_HEIGHT(mi);
- sp->total_npoints = MI_BATCHCOUNT(mi);
+ sp->total_npoints = MI_COUNT(mi);
if (sp->total_npoints < 1)
sp->total_npoints = 1;
- sp->corners = MI_SIZE(mi);
+ sp->corners = MI_SIZE(mi);
if (sp->corners < 3 || sp->corners > 4) {
- sp->corners = (LRAND() & 1) + 3;
+ sp->corners = (int) (LRAND() & 1) + 3;
}
for (i = 0; i < sp->corners; i++) {
if (!sp->pointBuffer[i])
- sp->pointBuffer[i] = (XPoint *) malloc(sp->total_npoints *
- sizeof (XPoint));
+ if ((sp->pointBuffer[i] = (XPoint *) malloc(sp->total_npoints *
+ sizeof (XPoint))) == NULL) {
+ free_sierpinski(sp);
+ return;
+ }
}
startover(mi);
}
{
Display *display = MI_DISPLAY(mi);
GC gc = MI_GC(mi);
- sierpinskistruct *sp = &tris[MI_SCREEN(mi)];
XPoint *xp[MAXCORNERS];
- int i = 0, v;
+ int i, v;
+ sierpinskistruct *sp;
+
+ if (tris == NULL)
+ return;
+ sp = &tris[MI_SCREEN(mi)];
+ if (sp->pointBuffer[0] == NULL)
+ return;
+ MI_IS_DRAWN(mi) = True;
if (MI_NPIXELS(mi) <= 2)
- XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
+ XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
for (i = 0; i < sp->corners; i++)
xp[i] = sp->pointBuffer[i];
for (i = 0; i < sp->total_npoints; i++) {
release_sierpinski(ModeInfo * mi)
{
if (tris != NULL) {
- int screen, i;
+ int screen;
- 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]);
- }
- }
+ for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++)
+ free_sierpinski(&tris[screen]);
(void) free((void *) tris);
- tris = NULL;
+ tris = (sierpinskistruct *) NULL;
}
}
void
refresh_sierpinski(ModeInfo * mi)
{
- /* Do nothing, it will refresh by itself */
+ MI_CLEARWINDOW(mi);
}
+
+#endif /* MODE_sierpinski */
projects / xscreensaver / blobdiff