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
|
/* -*- Mode: C; tab-width: 4 -*- */
/* fadeplot --- a fading plot of sine squared */
#if 0
static const char sccsid[] = "@(#)fadeplot.c 5.00 2000/11/01 xlockmore";
#endif
/*-
* Some easy plotting stuff, by Bas van Gaalen, Holland, PD
*
* Copyright (c) 1996 by Charles Vidal
*
* 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: Compatible with screensaver
* 1996: Written by Charles Vidal based on work by Bas van Gaalen
*/
#ifdef STANDALONE
# define MODE_fadeplot
# define DEFAULTS "*delay: 30000 \n" \
"*count: 10 \n" \
"*cycles: 1500 \n" \
"*ncolors: 64 \n" \
"*fpsSolid: true \n" \
"*ignoreRotation: True \n" \
# define BRIGHT_COLORS
# define UNIFORM_COLORS
# define release_fadeplot 0
# define fadeplot_handle_event 0
# include "xlockmore.h" /* in xscreensaver distribution */
#else /* STANDALONE */
# include "xlock.h" /* in xlockmore distribution */
#endif /* STANDALONE */
#ifdef MODE_fadeplot
ENTRYPOINT ModeSpecOpt fadeplot_opts =
{0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
#ifdef USE_MODULES
ModStruct fadeplot_description =
{"fadeplot", "init_fadeplot", "draw_fadeplot", (char *) NULL,
"refresh_fadeplot", "init_fadeplot", "free_fadeplot", &fadeplot_opts,
30000, 10, 1500, 1, 64, 0.6, "",
"Shows a fading plot of sine squared", 0, NULL};
#endif
#define MINSTEPS 1
typedef struct {
XPoint speed, step, factor, st;
int temps, maxpts, nbstep;
int min;
int width, height;
int pix;
int angles;
int *stab;
XPoint *pts;
} fadeplotstruct;
static fadeplotstruct *fadeplots = (fadeplotstruct *) NULL;
ENTRYPOINT void
free_fadeplot(ModeInfo * mi)
{
fadeplotstruct *fp = &fadeplots[MI_SCREEN(mi)];
if (fp->pts != NULL) {
(void) free((void *) fp->pts);
fp->pts = (XPoint *) NULL;
}
if (fp->stab != NULL) {
(void) free((void *) fp->stab);
fp->stab = (int *) NULL;
}
}
static Bool
initSintab(ModeInfo * mi)
{
fadeplotstruct *fp = &fadeplots[MI_SCREEN(mi)];
int i;
float x;
fp->angles = NRAND(950) + 250;
if ((fp->stab = (int *) malloc(fp->angles * sizeof (int))) == NULL) {
free_fadeplot(mi);
return False;
}
for (i = 0; i < fp->angles; i++) {
x = SINF(2.0 * M_PI * i / fp->angles);
fp->stab[i] = (int) (x * ABS(x) * fp->min) + fp->min;
}
return True;
}
ENTRYPOINT void
init_fadeplot (ModeInfo * mi)
{
fadeplotstruct *fp;
MI_INIT (mi, fadeplots);
fp = &fadeplots[MI_SCREEN(mi)];
fp->width = MI_WIDTH(mi);
fp->height = MI_HEIGHT(mi);
fp->min = MAX(MIN(fp->width, fp->height) / 2, 1);
fp->speed.x = 8;
fp->speed.y = 10;
fp->step.x = 1;
fp->step.y = 1;
fp->temps = 0;
fp->factor.x = MAX(fp->width / (2 * fp->min), 1);
fp->factor.y = MAX(fp->height / (2 * fp->min), 1);
fp->nbstep = MI_COUNT(mi);
if (fp->nbstep < -MINSTEPS) {
fp->nbstep = NRAND(-fp->nbstep - MINSTEPS + 1) + MINSTEPS;
} else if (fp->nbstep < MINSTEPS)
fp->nbstep = MINSTEPS;
fp->maxpts = MI_CYCLES(mi);
if (fp->maxpts < 1)
fp->maxpts = 1;
if (fp->pts == NULL) {
if ((fp->pts = (XPoint *) calloc(fp->maxpts, sizeof (XPoint))) ==
NULL) {
free_fadeplot(mi);
return;
}
}
if (MI_NPIXELS(mi) > 2)
fp->pix = NRAND(MI_NPIXELS(mi));
if (fp->stab != NULL)
(void) free((void *) fp->stab);
if (!initSintab(mi))
return;
MI_CLEARWINDOW(mi);
}
ENTRYPOINT void
draw_fadeplot (ModeInfo * mi)
{
Display *display = MI_DISPLAY(mi);
Window window = MI_WINDOW(mi);
GC gc = MI_GC(mi);
int i, j, temp;
fadeplotstruct *fp;
if (fadeplots == NULL)
return;
fp = &fadeplots[MI_SCREEN(mi)];
if (fp->stab == NULL)
return;
MI_IS_DRAWN(mi) = True;
XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
XDrawPoints(display, window, gc, fp->pts, fp->maxpts, CoordModeOrigin);
if (MI_NPIXELS(mi) > 2) {
XSetForeground(display, gc, MI_PIXEL(mi, fp->pix));
if (++fp->pix >= MI_NPIXELS(mi))
fp->pix = 0;
} else
XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
temp = 0;
for (j = 0; j < fp->nbstep; j++) {
for (i = 0; i < fp->maxpts / fp->nbstep; i++) {
fp->pts[temp].x =
fp->stab[(fp->st.x + fp->speed.x * j + i * fp->step.x) % fp->angles] *
fp->factor.x + fp->width / 2 - fp->min;
fp->pts[temp].y =
fp->stab[(fp->st.y + fp->speed.y * j + i * fp->step.y) % fp->angles] *
fp->factor.y + fp->height / 2 - fp->min;
temp++;
}
}
XDrawPoints(display, window, gc, fp->pts, temp, CoordModeOrigin);
fp->st.x = (fp->st.x + fp->speed.x) % fp->angles;
fp->st.y = (fp->st.y + fp->speed.y) % fp->angles;
fp->temps++;
if ((fp->temps % (fp->angles / 2)) == 0) {
fp->temps = fp->temps % fp->angles * 5;
if ((fp->temps % (fp->angles)) == 0)
fp->speed.y = (fp->speed.y + 1) % 30 + 1;
if ((fp->temps % (fp->angles * 2)) == 0)
fp->speed.x = (fp->speed.x) % 20;
if ((fp->temps % (fp->angles * 3)) == 0)
fp->step.y = (fp->step.y + 1) % 2 + 1;
MI_CLEARWINDOW(mi);
}
}
ENTRYPOINT void
reshape_fadeplot(ModeInfo * mi, int width, int height)
{
fadeplotstruct *fp = &fadeplots[MI_SCREEN(mi)];
fp->width = width;
fp->height = height;
fp->min = MAX(MIN(fp->width, fp->height) / 2, 1);
fp->factor.x = MAX(fp->width / (2 * fp->min), 1);
fp->factor.y = MAX(fp->height / (2 * fp->min), 1);
}
#ifndef STANDALONE
ENTRYPOINT void
refresh_fadeplot (ModeInfo * mi)
{
}
#endif
XSCREENSAVER_MODULE ("FadePlot", fadeplot)
#endif /* MODE_fadeplot */
|
