1 /* -*- Mode: C; tab-width: 4 -*- */
2 /* fadeplot --- a fading plot of sine squared */
4 #if !defined( lint ) && !defined( SABER )
5 static const char sccsid[] = "@(#)fadeplot.c 5.00 2000/11/01 xlockmore";
10 * Some easy plotting stuff, by Bas van Gaalen, Holland, PD
12 * Copyright (c) 1996 by Charles Vidal
14 * Permission to use, copy, modify, and distribute this software and its
15 * documentation for any purpose and without fee is hereby granted,
16 * provided that the above copyright notice appear in all copies and that
17 * both that copyright notice and this permission notice appear in
18 * supporting documentation.
20 * This file is provided AS IS with no warranties of any kind. The author
21 * shall have no liability with respect to the infringement of copyrights,
22 * trade secrets or any patents by this file or any part thereof. In no
23 * event will the author be liable for any lost revenue or profits or
24 * other special, indirect and consequential damages.
27 * 01-Nov-2000: Allocation checks
28 * 10-May-1997: Compatible with screensaver
29 * 1996: Written by Charles Vidal based on work by Bas van Gaalen
34 #define PROGCLASS "Fadeplot"
35 #define HACK_INIT init_fadeplot
36 #define HACK_DRAW draw_fadeplot
37 #define fadeplot_opts xlockmore_opts
38 #define DEFAULTS "*delay: 30000 \n" \
43 #define UNIFORM_COLORS
44 #include "xlockmore.h" /* in xscreensaver distribution */
45 #else /* STANDALONE */
46 #include "xlock.h" /* in xlockmore distribution */
48 #endif /* STANDALONE */
52 ModeSpecOpt fadeplot_opts =
53 {0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
56 ModStruct fadeplot_description =
57 {"fadeplot", "init_fadeplot", "draw_fadeplot", "release_fadeplot",
58 "refresh_fadeplot", "init_fadeplot", (char *) NULL, &fadeplot_opts,
59 30000, 10, 1500, 1, 64, 0.6, "",
60 "Shows a fading plot of sine squared", 0, NULL};
67 XPoint speed, step, factor, st;
68 int temps, maxpts, nbstep;
77 static fadeplotstruct *fadeplots = (fadeplotstruct *) NULL;
80 free_fadeplot(fadeplotstruct *fp)
82 if (fp->pts != NULL) {
83 (void) free((void *) fp->pts);
84 fp->pts = (XPoint *) NULL;
86 if (fp->stab != NULL) {
87 (void) free((void *) fp->stab);
88 fp->stab = (int *) NULL;
93 initSintab(ModeInfo * mi)
95 fadeplotstruct *fp = &fadeplots[MI_SCREEN(mi)];
99 fp->angles = NRAND(950) + 250;
100 if ((fp->stab = (int *) malloc(fp->angles * sizeof (int))) == NULL) {
104 for (i = 0; i < fp->angles; i++) {
105 x = SINF(2.0 * M_PI * i / fp->angles);
106 fp->stab[i] = (int) (x * ABS(x) * fp->min) + fp->min;
112 init_fadeplot(ModeInfo * mi)
116 if (fadeplots == NULL) {
117 if ((fadeplots = (fadeplotstruct *) calloc(MI_NUM_SCREENS(mi),
118 sizeof (fadeplotstruct))) == NULL)
121 fp = &fadeplots[MI_SCREEN(mi)];
123 fp->width = MI_WIDTH(mi);
124 fp->height = MI_HEIGHT(mi);
125 fp->min = MAX(MIN(fp->width, fp->height) / 2, 1);
132 fp->factor.x = MAX(fp->width / (2 * fp->min), 1);
133 fp->factor.y = MAX(fp->height / (2 * fp->min), 1);
135 fp->nbstep = MI_COUNT(mi);
136 if (fp->nbstep < -MINSTEPS) {
137 fp->nbstep = NRAND(-fp->nbstep - MINSTEPS + 1) + MINSTEPS;
138 } else if (fp->nbstep < MINSTEPS)
139 fp->nbstep = MINSTEPS;
141 fp->maxpts = MI_CYCLES(mi);
145 if (fp->pts == NULL) {
146 if ((fp->pts = (XPoint *) calloc(fp->maxpts, sizeof (XPoint))) ==
152 if (MI_NPIXELS(mi) > 2)
153 fp->pix = NRAND(MI_NPIXELS(mi));
155 if (fp->stab != NULL)
156 (void) free((void *) fp->stab);
163 draw_fadeplot(ModeInfo * mi)
165 Display *display = MI_DISPLAY(mi);
166 Window window = MI_WINDOW(mi);
171 if (fadeplots == NULL)
173 fp = &fadeplots[MI_SCREEN(mi)];
174 if (fp->stab == NULL)
177 MI_IS_DRAWN(mi) = True;
178 XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
179 XDrawPoints(display, window, gc, fp->pts, fp->maxpts, CoordModeOrigin);
181 if (MI_NPIXELS(mi) > 2) {
182 XSetForeground(display, gc, MI_PIXEL(mi, fp->pix));
183 if (++fp->pix >= MI_NPIXELS(mi))
186 XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
189 for (j = 0; j < fp->nbstep; j++) {
190 for (i = 0; i < fp->maxpts / fp->nbstep; i++) {
192 fp->stab[(fp->st.x + fp->speed.x * j + i * fp->step.x) % fp->angles] *
193 fp->factor.x + fp->width / 2 - fp->min;
195 fp->stab[(fp->st.y + fp->speed.y * j + i * fp->step.y) % fp->angles] *
196 fp->factor.y + fp->height / 2 - fp->min;
200 XDrawPoints(display, window, gc, fp->pts, temp, CoordModeOrigin);
202 fp->st.x = (fp->st.x + fp->speed.x) % fp->angles;
203 fp->st.y = (fp->st.y + fp->speed.y) % fp->angles;
205 if ((fp->temps % (fp->angles / 2)) == 0) {
206 fp->temps = fp->temps % fp->angles * 5;
207 if ((fp->temps % (fp->angles)) == 0)
208 fp->speed.y = (fp->speed.y++) % 30 + 1;
209 if ((fp->temps % (fp->angles * 2)) == 0)
210 fp->speed.x = (fp->speed.x) % 20;
211 if ((fp->temps % (fp->angles * 3)) == 0)
212 fp->step.y = (fp->step.y++) % 2 + 1;
218 refresh_fadeplot(ModeInfo * mi)
224 release_fadeplot(ModeInfo * mi)
226 if (fadeplots != NULL) {
229 for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++)
230 free_fadeplot(&fadeplots[screen]);
231 (void) free((void *) fadeplots);
232 fadeplots = (fadeplotstruct *) NULL;
236 #endif /* MODE_fadeplot */