1 /* -*- Mode: C; tab-width: 4 -*- */
2 /* fadeplot --- a fading plot of sine squared */
5 static const char sccsid[] = "@(#)fadeplot.c 5.00 2000/11/01 xlockmore";
9 * Some easy plotting stuff, by Bas van Gaalen, Holland, PD
11 * Copyright (c) 1996 by Charles Vidal
13 * Permission to use, copy, modify, and distribute this software and its
14 * documentation for any purpose and without fee is hereby granted,
15 * provided that the above copyright notice appear in all copies and that
16 * both that copyright notice and this permission notice appear in
17 * supporting documentation.
19 * This file is provided AS IS with no warranties of any kind. The author
20 * shall have no liability with respect to the infringement of copyrights,
21 * trade secrets or any patents by this file or any part thereof. In no
22 * event will the author be liable for any lost revenue or profits or
23 * other special, indirect and consequential damages.
26 * 01-Nov-2000: Allocation checks
27 * 10-May-1997: Compatible with screensaver
28 * 1996: Written by Charles Vidal based on work by Bas van Gaalen
33 #define PROGCLASS "Fadeplot"
34 #define HACK_INIT init_fadeplot
35 #define HACK_DRAW draw_fadeplot
36 #define fadeplot_opts xlockmore_opts
37 #define DEFAULTS "*delay: 30000 \n" \
42 #define UNIFORM_COLORS
43 #include "xlockmore.h" /* in xscreensaver distribution */
44 #else /* STANDALONE */
45 #include "xlock.h" /* in xlockmore distribution */
47 #endif /* STANDALONE */
51 ModeSpecOpt fadeplot_opts =
52 {0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
55 ModStruct fadeplot_description =
56 {"fadeplot", "init_fadeplot", "draw_fadeplot", "release_fadeplot",
57 "refresh_fadeplot", "init_fadeplot", (char *) NULL, &fadeplot_opts,
58 30000, 10, 1500, 1, 64, 0.6, "",
59 "Shows a fading plot of sine squared", 0, NULL};
66 XPoint speed, step, factor, st;
67 int temps, maxpts, nbstep;
76 static fadeplotstruct *fadeplots = (fadeplotstruct *) NULL;
79 free_fadeplot(fadeplotstruct *fp)
81 if (fp->pts != NULL) {
82 (void) free((void *) fp->pts);
83 fp->pts = (XPoint *) NULL;
85 if (fp->stab != NULL) {
86 (void) free((void *) fp->stab);
87 fp->stab = (int *) NULL;
92 initSintab(ModeInfo * mi)
94 fadeplotstruct *fp = &fadeplots[MI_SCREEN(mi)];
98 fp->angles = NRAND(950) + 250;
99 if ((fp->stab = (int *) malloc(fp->angles * sizeof (int))) == NULL) {
103 for (i = 0; i < fp->angles; i++) {
104 x = SINF(2.0 * M_PI * i / fp->angles);
105 fp->stab[i] = (int) (x * ABS(x) * fp->min) + fp->min;
111 init_fadeplot(ModeInfo * mi)
115 if (fadeplots == NULL) {
116 if ((fadeplots = (fadeplotstruct *) calloc(MI_NUM_SCREENS(mi),
117 sizeof (fadeplotstruct))) == NULL)
120 fp = &fadeplots[MI_SCREEN(mi)];
122 fp->width = MI_WIDTH(mi);
123 fp->height = MI_HEIGHT(mi);
124 fp->min = MAX(MIN(fp->width, fp->height) / 2, 1);
131 fp->factor.x = MAX(fp->width / (2 * fp->min), 1);
132 fp->factor.y = MAX(fp->height / (2 * fp->min), 1);
134 fp->nbstep = MI_COUNT(mi);
135 if (fp->nbstep < -MINSTEPS) {
136 fp->nbstep = NRAND(-fp->nbstep - MINSTEPS + 1) + MINSTEPS;
137 } else if (fp->nbstep < MINSTEPS)
138 fp->nbstep = MINSTEPS;
140 fp->maxpts = MI_CYCLES(mi);
144 if (fp->pts == NULL) {
145 if ((fp->pts = (XPoint *) calloc(fp->maxpts, sizeof (XPoint))) ==
151 if (MI_NPIXELS(mi) > 2)
152 fp->pix = NRAND(MI_NPIXELS(mi));
154 if (fp->stab != NULL)
155 (void) free((void *) fp->stab);
162 draw_fadeplot(ModeInfo * mi)
164 Display *display = MI_DISPLAY(mi);
165 Window window = MI_WINDOW(mi);
170 if (fadeplots == NULL)
172 fp = &fadeplots[MI_SCREEN(mi)];
173 if (fp->stab == NULL)
176 MI_IS_DRAWN(mi) = True;
177 XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
178 XDrawPoints(display, window, gc, fp->pts, fp->maxpts, CoordModeOrigin);
180 if (MI_NPIXELS(mi) > 2) {
181 XSetForeground(display, gc, MI_PIXEL(mi, fp->pix));
182 if (++fp->pix >= MI_NPIXELS(mi))
185 XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
188 for (j = 0; j < fp->nbstep; j++) {
189 for (i = 0; i < fp->maxpts / fp->nbstep; i++) {
191 fp->stab[(fp->st.x + fp->speed.x * j + i * fp->step.x) % fp->angles] *
192 fp->factor.x + fp->width / 2 - fp->min;
194 fp->stab[(fp->st.y + fp->speed.y * j + i * fp->step.y) % fp->angles] *
195 fp->factor.y + fp->height / 2 - fp->min;
199 XDrawPoints(display, window, gc, fp->pts, temp, CoordModeOrigin);
201 fp->st.x = (fp->st.x + fp->speed.x) % fp->angles;
202 fp->st.y = (fp->st.y + fp->speed.y) % fp->angles;
204 if ((fp->temps % (fp->angles / 2)) == 0) {
205 fp->temps = fp->temps % fp->angles * 5;
206 if ((fp->temps % (fp->angles)) == 0)
207 fp->speed.y = (fp->speed.y++) % 30 + 1;
208 if ((fp->temps % (fp->angles * 2)) == 0)
209 fp->speed.x = (fp->speed.x) % 20;
210 if ((fp->temps % (fp->angles * 3)) == 0)
211 fp->step.y = (fp->step.y++) % 2 + 1;
217 refresh_fadeplot(ModeInfo * mi)
223 release_fadeplot(ModeInfo * mi)
225 if (fadeplots != NULL) {
228 for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++)
229 free_fadeplot(&fadeplots[screen]);
230 (void) free((void *) fadeplots);
231 fadeplots = (fadeplotstruct *) NULL;
235 #endif /* MODE_fadeplot */