-/* -*- Mode: C; tab-width: 4 -*-
- * braid --- draws random color-cyling rotating braids around a circle.
+/* -*- Mode: C; tab-width: 4 -*- */
+/*-
+ * braid --- random braids around a circle and then changes the color in
+ * a rotational pattern
*/
+
#if !defined( lint ) && !defined( SABER )
-static const char sccsid[] = "@(#)braid.c 4.00 97/01/01 xlockmore";
+static const char sccsid[] = "@(#)braid.c 5.00 2000/11/01 xlockmore";
+
#endif
-/*
+/*-
* Copyright (c) 1995 by John Neil.
*
* Permission to use, copy, modify, and distribute this software and its
* other special, indirect and consequential damages.
*
* Revision History:
- * 10-May-97: jwz@jwz.org: turned into a standalone program.
- * 01-Sep-95: color knotted components differently, J. Neil.
- * 29-Aug-95: Written. John Neil <neil@math.idbsu.edu>
+ * 01-Nov-2000: Allocation checks
+ * 10-May-1997: Jamie Zawinski <jwz@jwz.org> compatible with xscreensaver
+ * 01-Sep-1995: color knotted components differently, J. Neil.
+ * 29-Aug-1995: Written. John Neil <neil@math.idbsu.edu>
*/
#ifdef STANDALONE
-# define PROGCLASS "Braid"
-# define HACK_INIT init_braid
-# define HACK_DRAW draw_braid
-# define braid_opts xlockmore_opts
-# define DEFAULTS "*count: 15 \n" \
- "*size: -7 \n" \
- "*cycles: 100 \n" \
- "*delay: 1000 \n" \
- "*ncolors: 64 \n"
-# define UNIFORM_COLORS
-# include "xlockmore.h" /* from the xscreensaver distribution */
-# include "erase.h"
-#else /* !STANDALONE */
-# include "xlock.h" /* from the xlockmore distribution */
-#endif /* !STANDALONE */
-
-ModeSpecOpt braid_opts = {
- 0, NULL, 0, NULL, NULL };
+#define MODE_braid
+#define PROGCLASS "Braid"
+#define HACK_INIT init_braid
+#define HACK_DRAW draw_braid
+#define braid_opts xlockmore_opts
+#define DEFAULTS "*delay: 1000 \n" \
+ "*count: 15 \n" \
+ "*cycles: 100 \n" \
+ "*size: -7 \n" \
+ "*ncolors: 64 \n"
+#define UNIFORM_COLORS
+#include "xlockmore.h"
+#include "erase.h"
+#else /* STANDALONE */
+#include "xlock.h"
+
+#endif /* STANDALONE */
+
+#ifdef MODE_braid
+
+ModeSpecOpt braid_opts =
+{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
+
+#ifdef USE_MODULES
+ModStruct braid_description =
+{"braid", "init_braid", "draw_braid", "release_braid",
+ "refresh_braid", "init_braid", (char *) NULL, &braid_opts,
+ 1000, 15, 100, 1, 64, 1.0, "",
+ "Shows random braids and knots", 0, NULL};
+#endif
#if defined( COLORROUND ) && defined( COLORCOMP )
#undef COLORROUND
#define FLOATRAND(min,max) ((min)+((double) LRAND()/((double) MAXRAND))*((max)-(min)))
typedef struct {
+ int linewidth;
int braidword[MAXLENGTH];
int components[MAXSTRANDS];
int startcomp[MAXLENGTH][MAXSTRANDS];
float max_radius;
float top, bottom, left, right;
int age;
- int color_direction;
+ int color_direction;
} braidtype;
-static braidtype *braids = NULL;
+static braidtype *braids = (braidtype *) NULL;
static int
applyword(braidtype * braid, int string, int position)
void
init_braid(ModeInfo * mi)
{
- Display *display = MI_DISPLAY(mi);
braidtype *braid;
int used[MAXSTRANDS];
int i, count, comp, c;
}
braid = &braids[MI_SCREEN(mi)];
- braid->center_x = MI_WIN_WIDTH(mi) / 2;
- braid->center_y = MI_WIN_HEIGHT(mi) / 2;
+ braid->center_x = MI_WIDTH(mi) / 2;
+ braid->center_y = MI_HEIGHT(mi) / 2;
braid->age = 0;
/* jwz: go in the other direction sometimes. */
braid->color_direction = ((LRAND() & 1) ? 1 : -1);
- XClearWindow(display, MI_WINDOW(mi));
+
+ MI_CLEARWINDOW(mi);
min_length = (braid->center_x > braid->center_y) ?
braid->center_y : braid->center_x;
braid->min_radius = min_length * 0.30;
braid->max_radius = min_length * 0.90;
- if (MI_BATCHCOUNT(mi) < MINSTRANDS)
+ if (MI_COUNT(mi) < MINSTRANDS)
braid->nstrands = MINSTRANDS;
else
braid->nstrands = INTRAND(MINSTRANDS,
- MAX(MIN(MIN(MAXSTRANDS, MI_BATCHCOUNT(mi)),
- (int) ((braid->max_radius - braid->min_radius) / 5.0)), MINSTRANDS));
+ MAX(MIN(MIN(MAXSTRANDS, MI_COUNT(mi)),
+ (int) ((braid->max_radius - braid->min_radius) / 5.0)), MINSTRANDS));
braid->braidlength = INTRAND(MINLENGTH, MIN(MAXLENGTH, braid->nstrands * 6));
for (i = 0; i < braid->braidlength; i++) {
braid->startcolor = (MI_NPIXELS(mi) > 2) ?
(float) NRAND(MI_NPIXELS(mi)) : 0.0;
- /* XSetLineAttributes (display, MI_GC(mi), 2, LineSolid, CapRound,
+ /* XSetLineAttributes (display, MI_GC(mi), 2, LineSolid, CapRound,
JoinRound); */
(void) memset((char *) braid->components, 0, sizeof (braid->components));
}
} while (count > 0);
- {
- int line_width = MI_SIZE(mi);
- if (line_width == 0)
- line_width = -8;
- if (line_width < 0)
- line_width = NRAND(-line_width)+1;
- if (line_width == 1)
- line_width = 0;
- XSetLineAttributes(MI_DISPLAY(mi), MI_GC(mi), line_width,
- LineSolid,
- (line_width <= 3 ? CapButt : CapRound),
- JoinMiter);
- }
-
+ braid->linewidth = MI_SIZE(mi);
+ if (braid->linewidth < 0)
+ braid->linewidth = NRAND(-braid->linewidth) + 1;
+ if (braid->linewidth * braid->linewidth * 8 > MIN(MI_WIDTH(mi), MI_HEIGHT(mi)))
+ braid->linewidth = MIN(1, (int) sqrt((double) MIN(MI_WIDTH(mi), MI_HEIGHT(mi)) / 8));
for (i = 0; i < braid->nstrands; i++)
if (!(braid->components[i] & 1))
braid->components[i] *= -1;
{
Display *display = MI_DISPLAY(mi);
Window window = MI_WINDOW(mi);
- braidtype *braid = &braids[MI_SCREEN(mi)];
- float num_points, t_inc;
+ int num_points = 500;
+ float t_inc;
float theta, psi;
float t, r_diff;
int i, s;
float x_1, y_1, x_2, y_2, r1, r2;
float color, color_use = 0.0, color_inc;
+ braidtype *braid;
- num_points = 500.0;
- theta = (2.0 * M_PI) / (float) (braid->braidlength);
- t_inc = (2.0 * M_PI) / num_points;
- color_inc = (float) MI_NPIXELS(mi) / num_points;
- color_inc *= braid->color_direction;
+ if (braids == NULL)
+ return;
+ braid = &braids[MI_SCREEN(mi)];
+ MI_IS_DRAWN(mi) = True;
+ XSetLineAttributes(display, MI_GC(mi), braid->linewidth,
+ LineSolid,
+ (braid->linewidth <= 3 ? CapButt : CapRound),
+ JoinMiter);
+
+ theta = (2.0 * M_PI) / (float) (braid->braidlength);
+ t_inc = (2.0 * M_PI) / (float) num_points;
+ color_inc = (float) MI_NPIXELS(mi) * braid->color_direction /
+ (float) num_points;
braid->startcolor += SPINRATE * color_inc;
- if (braid->startcolor >= MI_NPIXELS(mi))
+ if (((int) braid->startcolor) >= MI_NPIXELS(mi))
braid->startcolor = 0.0;
r_diff = (braid->max_radius - braid->min_radius) / (float) (braid->nstrands);
for (t = 0.0; t < theta; t += t_inc) {
#ifdef COLORROUND
color += color_inc;
- if (color >= (float) (MI_NPIXELS(mi)))
+ if (((int) color) >= MI_NPIXELS(mi))
color = 0.0;
color_use = color;
#endif
color_use = color + SPINRATE *
braid->components[applywordbackto(braid, s, i)] +
(psi + t) / 2.0 / M_PI * (float) MI_NPIXELS(mi);
- while (color_use >= (float) MI_NPIXELS(mi))
+ while (((int) color_use) >= MI_NPIXELS(mi))
color_use -= (float) MI_NPIXELS(mi);
- while (color_use < 0.0)
+ while (((int) color_use) < 0)
color_use += (float) MI_NPIXELS(mi);
}
#endif
#ifdef COLORROUND
if (MI_NPIXELS(mi) > 2) {
color_use += SPINRATE * color_inc;
- while (color_use >= (float) (MI_NPIXELS(mi)))
+ while (((int) color_use) >= MI_NPIXELS(mi))
color_use -= (float) MI_NPIXELS(mi);
}
#endif
if (MI_NPIXELS(mi) > 2)
XSetForeground(display, MI_GC(mi), MI_PIXEL(mi, (int) color_use));
else
- XSetForeground(display, MI_GC(mi), MI_WIN_WHITE_PIXEL(mi));
+ XSetForeground(display, MI_GC(mi), MI_WHITE_PIXEL(mi));
XDrawLine(display, window, MI_GC(mi),
(int) (x_1), (int) (y_1), (int) (x_2), (int) (y_2));
color_use = color + SPINRATE *
braid->components[applywordbackto(braid, s + 1, i)] +
(psi + t) / 2.0 / M_PI * (float) MI_NPIXELS(mi);
- while (color_use >= (float) MI_NPIXELS(mi))
+ while (((int) color_use) >= MI_NPIXELS(mi))
color_use -= (float) MI_NPIXELS(mi);
- while (color_use < 0.0)
+ while (((int) color_use) < 0)
color_use += (float) MI_NPIXELS(mi);
}
#endif
if (MI_NPIXELS(mi) > 2)
XSetForeground(display, MI_GC(mi), MI_PIXEL(mi, (int) color_use));
else
- XSetForeground(display, MI_GC(mi), MI_WIN_WHITE_PIXEL(mi));
+ XSetForeground(display, MI_GC(mi), MI_WHITE_PIXEL(mi));
XDrawLine(display, window, MI_GC(mi),
(int) (x_1), (int) (y_1), (int) (x_2), (int) (y_2));
color_use = color + SPINRATE *
braid->components[applywordbackto(braid, s, i)] +
(psi + t) / 2.0 / M_PI * (float) MI_NPIXELS(mi);
- while (color_use >= (float) MI_NPIXELS(mi))
+ while (((int) color_use) >= MI_NPIXELS(mi))
color_use -= (float) MI_NPIXELS(mi);
- while (color_use < 0.0)
+ while (((int) color_use) < 0)
color_use += (float) MI_NPIXELS(mi);
}
#endif
#ifdef COLORROUND
if (MI_NPIXELS(mi) > 2) {
color_use += SPINRATE * color_inc;
- while (color_use >= (float) MI_NPIXELS(mi))
+ while (((int) color_use) >= MI_NPIXELS(mi))
color_use -= (float) MI_NPIXELS(mi);
}
#endif
if (MI_NPIXELS(mi) > 2)
XSetForeground(display, MI_GC(mi), MI_PIXEL(mi, (int) color_use));
else
- XSetForeground(display, MI_GC(mi), MI_WIN_WHITE_PIXEL(mi));
+ XSetForeground(display, MI_GC(mi), MI_WHITE_PIXEL(mi));
XDrawLine(display, window, MI_GC(mi),
(int) (x_1), (int) (y_1), (int) (x_2), (int) (y_2));
}
}
}
+ XSetLineAttributes(display, MI_GC(mi), 1, LineSolid, CapNotLast, JoinRound);
if (++braid->age > MI_CYCLES(mi)) {
#ifdef STANDALONE
erase_full_window(MI_DISPLAY(mi), MI_WINDOW(mi));
#endif
- init_braid(mi);
+ init_braid(mi);
}
}
{
if (braids != NULL) {
(void) free((void *) braids);
- braids = NULL;
+ braids = (braidtype *) NULL;
}
}
void
refresh_braid(ModeInfo * mi)
{
- /* Do nothing, it will refresh by itself */
+ MI_CLEARWINDOW(mi);
}
+
+#endif /* MODE_braid */
projects / xscreensaver / blobdiff