1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
|
/* -*- Mode: C; tab-width: 4 -*- */
/* spiral --- spiraling dots */
#if 0
static const char sccsid[] = "@(#)spiral.c 5.00 2000/11/01 xlockmore";
#endif
/*-
* Copyright (c) 1994 by Darrick Brown.
*
* 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:
* 01-Nov-2000: Allocation checks
* 10-May-1997: jwz@jwz.org: turned into a standalone program.
* 24-Jul-1995: Fix to allow cycles not to have an arbitrary value by
* Peter Schmitzberger (schmitz@coma.sbg.ac.at).
* 06-Mar-1995: Finished cleaning up and final testing.
* 03-Mar-1995: Cleaned up code.
* 12-Jul-1994: Written.
*
* Low CPU usage mode.
* Idea based on a graphics demo I saw a *LONG* time ago.
*/
#ifdef STANDALONE
# define MODE_spiral
#define DEFAULTS "*delay: 50000 \n" \
"*count: 40 \n" \
"*cycles: 350 \n" \
"*ncolors: 64 \n" \
"*fpsSolid: true \n" \
# define SMOOTH_COLORS
# define release_spiral 0
# define reshape_spiral 0
# define spiral_handle_event 0
# include "xlockmore.h" /* from the xscreensaver distribution */
#else /* !STANDALONE */
# include "xlock.h" /* from the xlockmore distribution */
#endif /* !STANDALONE */
#ifdef MODE_spiral
ENTRYPOINT ModeSpecOpt spiral_opts =
{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
#ifdef USE_MODULES
ModStruct spiral_description =
{"spiral", "init_spiral", "draw_spiral", (char *) NULL,
"refresh_spiral", "init_spiral", "free_spiral", &spiral_opts,
5000, -40, 350, 1, 64, 1.0, "",
"Shows a helical locus of points", 0, NULL};
#endif
#define MAXTRAIL 512 /* The length of the trail */
#define MAXDOTS 40
#define MINDOTS 1
#define TWOPI (2.0*M_PI) /* for convienence */
#define JAGGINESS 4 /* This sets the "Craziness" of the spiral (I like 4) */
#define SPEED 2.0
/* How many segments to draw per cycle when redrawing */
#define REDRAWSTEP 3
typedef struct {
float hx, hy, ha, hr;
} Traildots;
typedef struct {
Traildots *traildots;
float cx, cy;
float angle;
float radius;
float dr, da;
float dx, dy;
int erase;
int inc;
float colors;
int width, height;
float top, bottom, left, right;
int dots, nlength;
int redrawing, redrawpos;
} spiralstruct;
static spiralstruct *spirals = (spiralstruct *) NULL;
static void draw_dots(ModeInfo * mi, int in);
#define TFX(sp,x) ((int)((x/sp->right)*(float)sp->width))
#define TFY(sp,y) ((int)((y/sp->top)*(float)sp->height))
static void
draw_dots(ModeInfo * mi, int in)
{
float i, inc;
float x, y;
spiralstruct *sp = &spirals[MI_SCREEN(mi)];
inc = TWOPI / (float) sp->dots;
for (i = 0.0; i < TWOPI; i += inc) {
x = sp->traildots[in].hx + COSF(i + sp->traildots[in].ha) *
sp->traildots[in].hr;
y = sp->traildots[in].hy + SINF(i + sp->traildots[in].ha) *
sp->traildots[in].hr;
XDrawPoint(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
TFX(sp, x), TFY(sp, y));
}
}
ENTRYPOINT void
init_spiral(ModeInfo * mi)
{
spiralstruct *sp;
int i;
MI_INIT (mi, spirals);
sp = &spirals[MI_SCREEN(mi)];
#ifdef HAVE_JWXYZ
jwxyz_XSetAntiAliasing (MI_DISPLAY(mi), MI_GC(mi), False);
#endif
sp->width = MI_WIDTH(mi);
sp->height = MI_HEIGHT(mi);
MI_CLEARWINDOW(mi);
/* Init */
sp->nlength = MI_CYCLES(mi);
if (!sp->traildots)
if ((sp->traildots = (Traildots *) malloc(sp->nlength *
sizeof (Traildots))) == NULL) {
return;
}
/* initialize the allocated array */
for (i = 0; i < sp->nlength; i++) {
sp->traildots[i].hx = 0.0;
sp->traildots[i].hy = 0.0;
sp->traildots[i].ha = 0.0;
sp->traildots[i].hr = 0.0;
}
sp->redrawing = 0;
/* keep the window parameters proportional */
sp->top = 10000.0;
sp->bottom = 0;
sp->right = (float) (sp->width) / (float) (sp->height) * (10000.0);
sp->left = 0;
/* assign the initial values */
sp->cx = (float) (5000.0 - NRAND(2000)) / 10000.0 * sp->right;
sp->cy = (float) (5000.0 - NRAND(2000));
sp->radius = (float) (NRAND(200) + 200);
sp->angle = 0.0;
sp->dx = (float) (10 - NRAND(20)) * SPEED;
sp->dy = (float) (10 - NRAND(20)) * SPEED;
sp->dr = (float) ((NRAND(10) + 4) * (1 - (LRAND() & 1) * 2));
sp->da = (float) NRAND(360) / 7200.0 + 0.01;
if (MI_NPIXELS(mi) > 2)
sp->colors = (float) NRAND(MI_NPIXELS(mi));
sp->erase = 0;
sp->inc = 0;
sp->traildots[sp->inc].hx = sp->cx;
sp->traildots[sp->inc].hy = sp->cy;
sp->traildots[sp->inc].ha = sp->angle;
sp->traildots[sp->inc].hr = sp->radius;
sp->inc++;
sp->dots = MI_COUNT(mi);
if (sp->dots < -MINDOTS)
sp->dots = NRAND(sp->dots - MINDOTS + 1) + MINDOTS;
/* Absolute minimum */
if (sp->dots < MINDOTS)
sp->dots = MINDOTS;
}
ENTRYPOINT void
draw_spiral(ModeInfo * mi)
{
Display *display = MI_DISPLAY(mi);
GC gc = MI_GC(mi);
int i, j;
spiralstruct *sp;
if (spirals == NULL)
return;
sp = &spirals[MI_SCREEN(mi)];
if (sp->traildots == NULL)
return;
MI_IS_DRAWN(mi) = True;
if (sp->erase == 1) {
XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
draw_dots(mi, sp->inc);
}
sp->cx += sp->dx;
sp->traildots[sp->inc].hx = sp->cx;
if ((sp->cx > 9000.0) || (sp->cx < 1000.0))
sp->dx *= -1.0;
sp->cy += sp->dy;
sp->traildots[sp->inc].hy = sp->cy;
if ((sp->cy > 9000.0) || (sp->cy < 1000.0))
sp->dy *= -1.0;
sp->radius += sp->dr;
sp->traildots[sp->inc].hr = sp->radius;
if ((sp->radius > 2500.0) && (sp->dr > 0.0))
sp->dr *= -1.0;
else if ((sp->radius < 50.0) && (sp->radius < 0.0))
sp->dr *= -1.0;
/* Randomly give some variations to: */
/* spiral direction (if it is within the boundaries) */
if ((NRAND(3000) < 1 * JAGGINESS) &&
(((sp->cx > 2000.0) && (sp->cx < 8000.0)) &&
((sp->cy > 2000.0) && (sp->cy < 8000.0)))) {
sp->dx = (float) (10 - NRAND(20)) * SPEED;
sp->dy = (float) (10 - NRAND(20)) * SPEED;
}
/* The speed of the change in size of the spiral */
if (NRAND(3000) < 1 * JAGGINESS) {
if (LRAND() & 1)
sp->dr += (float) (NRAND(3) + 1);
else
sp->dr -= (float) (NRAND(3) + 1);
/* don't let it get too wild */
if (sp->dr > 18.0)
sp->dr = 18.0;
else if (sp->dr < 4.0)
sp->dr = 4.0;
}
/* The speed of rotation */
if (NRAND(3000) < 1 * JAGGINESS)
sp->da = (float) NRAND(360) / 7200.0 + 0.01;
/* Reverse rotation */
if (NRAND(3000) < 1 * JAGGINESS)
sp->da *= -1.0;
sp->angle += sp->da;
sp->traildots[sp->inc].ha = sp->angle;
if (sp->angle > TWOPI)
sp->angle -= TWOPI;
else if (sp->angle < 0.0)
sp->angle += TWOPI;
sp->colors += (float) MI_NPIXELS(mi) / ((float) (2 * sp->nlength));
if (sp->colors >= (float) MI_NPIXELS(mi))
sp->colors = 0.0;
if (MI_NPIXELS(mi) > 2)
XSetForeground(display, gc, MI_PIXEL(mi, (int) sp->colors));
else
XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
draw_dots(mi, sp->inc);
sp->inc++;
if (sp->inc > sp->nlength - 1) {
sp->inc -= sp->nlength;
sp->erase = 1;
}
if (sp->redrawing) {
for (i = 0; i < REDRAWSTEP; i++) {
j = (sp->inc - sp->redrawpos + sp->nlength) % sp->nlength;
draw_dots(mi, j);
if (++(sp->redrawpos) >= sp->nlength) {
sp->redrawing = 0;
break;
}
}
}
}
ENTRYPOINT void
free_spiral(ModeInfo * mi)
{
spiralstruct *sp;
if (spirals == NULL)
return;
sp = &spirals[MI_SCREEN(mi)];
if (sp->traildots)
(void) free((void *) sp->traildots);
}
#ifndef STANDALONE
ENTRYPOINT void
refresh_spiral(ModeInfo * mi)
{
spiralstruct *sp;
if (spirals == NULL)
return;
sp = &spirals[MI_SCREEN(mi)];
MI_CLEARWINDOW(mi);
sp->redrawing = 1;
sp->redrawpos = 0;
}
#endif
XSCREENSAVER_MODULE ("Spiral", spiral)
#endif /* MODE_spiral */
|
