-/* -*- Mode: C; tab-width: 4 -*-
- * lightning --- fractal lightning bolts.
- */
+/* -*- Mode: C; tab-width: 4 -*- */
+/* lightning --- fractal lightning bolds */
+
#if !defined( lint ) && !defined( SABER )
-static const char sccsid[] = "@(#)lightning.c 4.00 97/01/01 xlockmore";
+static const char sccsid[] = "@(#)lightning.c 5.00 2000/11/01 xlockmore";
+
#endif
-/* Copyright (c) 1996 by Keith Romberg <kromberg@saxe.com>.
+/*-
+ * Copyright (c) 1996 by Keith Romberg <kromberg@saxe.com>
*
* 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@jwz.org: turned into a standalone program.
- * 14-Jul-96: Cleaned up code.
- * 27-Jun-96: Written and submitted by Keith Romberg <kromberg@saxe.com>.
+ * 01-Nov-2000: Allocation checks
+ * 10-May-1997: Compatible with xscreensaver
+ * 14-Jul-1996: Cleaned up code.
+ * 27-Jun-1996: Written and submitted by Keith Romberg <kromberg@saxe.com>.
*/
#ifdef STANDALONE
-# define PROGCLASS "Lightning"
-# define HACK_INIT init_lightning
-# define HACK_DRAW draw_lightning
-# define lightning_opts xlockmore_opts
-# define DEFAULTS "*delay: 10000 \n" \
- "*ncolors: 200 \n"
-# define BRIGHT_COLORS
-# include "xlockmore.h" /* from the xscreensaver distribution */
-#else /* !STANDALONE */
-# include "xlock.h" /* from the xlockmore distribution */
-#endif /* !STANDALONE */
-
-ModeSpecOpt lightning_opts = {
- 0, NULL, 0, NULL, NULL };
-
-/*---------------------------- defines -------------------------------*/
+#define MODE_lightning
+#define PROGCLASS "Lightning"
+#define HACK_INIT init_lightning
+#define HACK_DRAW draw_lightning
+#define lightning_opts xlockmore_opts
+#define DEFAULTS "*delay: 10000 \n"
+#define BRIGHT_COLORS
+#include "xlockmore.h" /* in xscreensaver distribution */
+#else /* STANDALONE */
+#include "xlock.h" /* in xlockmore distribution */
+#endif /* STANDALONE */
+
+#ifdef MODE_lightning
+
+ModeSpecOpt lightning_opts =
+{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
+
+#ifdef USE_MODULES
+ModStruct lightning_description =
+{"lightning", "init_lightning", "draw_lightning", "release_lightning",
+ "refresh_lightning", "init_lightning", (char *) NULL, &lightning_opts,
+ 10000, 1, 1, 1, 64, 0.6, "",
+ "Shows Keith's fractal lightning bolts", 0, NULL};
+
+#endif
#define BOLT_NUMBER 4
#define BOLT_ITERATION 4
int give_it_hell;
int draw_time;
int stage;
+ int busyLoop;
unsigned long color;
} Storm;
-static Storm *Helga = NULL;
+static Storm *Helga = (Storm *) NULL;
/*------------------- function prototypes ----------------------------*/
static int flashing_strike(void);
static void flash_duration(int *start, int *end, int total_duration);
static void random_storm(Storm * st);
-static void generate(XPoint A, XPoint B, int iter, XPoint * verts, int *index);
+static void generate(XPoint A, XPoint B, int iter, XPoint * verts, int *vert_index);
static void create_fork(Fork * f, XPoint start, XPoint end, int level);
static void first_strike(Lightning bolt, ModeInfo * mi);
static void level2_strike(Lightning bolt, ModeInfo * mi);
static int storm_active(Storm * st);
-static void update_bolt(Lightning * bolt, int time);
+static void update_bolt(Lightning * bolt, int time_now);
static void wiggle_bolt(Lightning * bolt);
static void wiggle_line(XPoint * p, int number, int wiggle_amount);
}
static void
-generate(XPoint A, XPoint B, int iter, XPoint * verts, int *index)
+generate(XPoint A, XPoint B, int iter, XPoint * verts, int *vert_index)
{
XPoint mid;
mid.y = (A.y + B.y) / 2 + NRAND(HEIGHT_VARIATION) - HEIGHT_VARIATION / 2;
if (!iter) {
- verts[*index].x = mid.x;
- verts[*index].y = mid.y;
- (*index)++;
+ verts[*vert_index].x = mid.x;
+ verts[*vert_index].y = mid.y;
+ (*vert_index)++;
return;
}
- generate(A, mid, iter - 1, verts, index);
- generate(mid, B, iter - 1, verts, index);
+ generate(A, mid, iter - 1, verts, vert_index);
+ generate(mid, B, iter - 1, verts, vert_index);
}
/*------------------------------------------------------------------------*/
/*------------------------------------------------------------------------*/
static void
-update_bolt(Lightning * bolt, int time)
+update_bolt(Lightning * bolt, int time_now)
{
wiggle_bolt(bolt);
if ((bolt->wiggle_amount == 0) && (bolt->wiggle_number > 2))
bolt->wiggle_number = 0;
- if (((time % 3) == 0))
+ if (((time_now % 3) == 0))
bolt->wiggle_amount++;
- if (((time >= bolt->delay_time) && (time < bolt->flash_begin)) ||
- (time > bolt->flash_stop))
+ if (((time_now >= bolt->delay_time) && (time_now < bolt->flash_begin)) ||
+ (time_now > bolt->flash_stop))
bolt->visible = 1;
else
bolt->visible = 0;
- if (time == bolt->delay_time)
+ if (time_now == bolt->delay_time)
bolt->strike_level = FIRST_LEVEL_STRIKE;
- else if (time == (bolt->delay_time + 1))
+ else if (time_now == (bolt->delay_time + 1))
bolt->strike_level = LEVEL_ONE_STRIKE;
- else if ((time > (bolt->delay_time + 1)) &&
- (time <= (bolt->delay_time + bolt->flash_begin - 2)))
+ else if ((time_now > (bolt->delay_time + 1)) &&
+ (time_now <= (bolt->delay_time + bolt->flash_begin - 2)))
bolt->strike_level = LEVEL_TWO_STRIKE;
- else if (time == (bolt->delay_time + bolt->flash_begin - 1))
+ else if (time_now == (bolt->delay_time + bolt->flash_begin - 1))
bolt->strike_level = LEVEL_ONE_STRIKE;
- else if (time == (bolt->delay_time + bolt->flash_stop + 1))
+ else if (time_now == (bolt->delay_time + bolt->flash_stop + 1))
bolt->strike_level = LEVEL_ONE_STRIKE;
else
bolt->strike_level = LEVEL_TWO_STRIKE;
GC gc = MI_GC(mi);
int i;
- XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
+ XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
XDrawLine(display, window, gc,
bolt.end1.x, bolt.end1.y, bolt.middle[0].x, bolt.middle[0].y);
draw_line(mi, bolt.middle, BOLT_VERTICIES, gc, 0);
if (MI_NPIXELS(mi) > 2) /* color */
XSetForeground(display, gc, MI_PIXEL(mi, st->color));
else
- XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
+ XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
XDrawLine(display, window, gc,
bolt.end1.x - 1, bolt.end1.y, bolt.middle[0].x - 1, bolt.middle[0].y);
draw_line(mi, bolt.middle, BOLT_VERTICIES, gc, -1);
static int
distance(XPoint a, XPoint b)
{
- return ((int) sqrt((a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y)));
+ return ((int) sqrt((double) (a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y)));
}
/*------------------------------------------------------------------------*/
if (MI_NPIXELS(mi) > 2)
XSetForeground(display, gc, MI_PIXEL(mi, st->color));
else
- XSetForeground(display, gc, MI_WIN_WHITE_PIXEL(mi));
+ XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
XDrawLine(display, window, gc,
bolt.end1.x - 2, bolt.end1.y, bolt.middle[0].x - 2, bolt.middle[0].y);
draw_line(mi, bolt.middle, BOLT_VERTICIES, gc, -2);
}
st = &Helga[MI_SCREEN(mi)];
- st->scr_width = MI_WIN_WIDTH(mi);
- st->scr_height = MI_WIN_HEIGHT(mi);
+ st->scr_width = MI_WIDTH(mi);
+ st->scr_height = MI_HEIGHT(mi);
st->multi_strike = setup_multi_strike();
random_storm(st);
void
draw_lightning(ModeInfo * mi)
{
- Storm *st = &Helga[MI_SCREEN(mi)];
int i;
+ Storm *st;
+ if (Helga == NULL)
+ return;
+ st = &Helga[MI_SCREEN(mi)];
+ MI_IS_DRAWN(mi) = True;
switch (st->stage) {
case 0:
- XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
+ MI_IS_DRAWN(mi) = False;
+ MI_CLEARWINDOW(mi);
+ MI_IS_DRAWN(mi) = True;
+
st->color = NRAND(MI_NPIXELS(mi));
st->draw_time = 0;
if (storm_active(st))
st->stage++;
else
- st->stage = 3;
+ st->stage = 4;
break;
case 1:
for (i = 0; i < st->multi_strike; i++) {
update_bolt(&(st->bolts[i]), st->draw_time);
}
st->draw_time++;
- XFlush(MI_DISPLAY(mi));
- MI_PAUSE(mi) = 60000;
st->stage++;
+ st->busyLoop = 0;
break;
case 2:
- XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
+ if (++st->busyLoop > 6) {
+ st->stage++;
+ st->busyLoop = 0;
+ }
+ break;
+ case 3:
+ MI_IS_DRAWN(mi) = False;
+ MI_CLEARWINDOW(mi);
+ MI_IS_DRAWN(mi) = True;
+
if (storm_active(st))
st->stage = 1;
else
st->stage++;
break;
- case 3:
- MI_PAUSE(mi) = 1000000;
+ case 4:
+ if (++st->busyLoop > 100) {
+ st->busyLoop = 0;
+ }
init_lightning(mi);
break;
}
{
if (Helga != NULL) {
(void) free((void *) Helga);
- Helga = NULL;
+ Helga = (Storm *) NULL;
}
}
{
/* Do nothing, it will refresh by itself */
}
+
+#endif /* MODE_lightning */
projects / xscreensaver / blobdiff