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
32 # define MODE_fadeplot
33 # define DEFAULTS "*delay: 30000 \n" \
37 "*fpsSolid: true \n" \
38 "*ignoreRotation: True \n" \
40 # define BRIGHT_COLORS
41 # define UNIFORM_COLORS
42 # define release_fadeplot 0
43 # define fadeplot_handle_event 0
44 # include "xlockmore.h" /* in xscreensaver distribution */
45 #else /* STANDALONE */
46 # include "xlock.h" /* in xlockmore distribution */
47 #endif /* STANDALONE */
51 ENTRYPOINT ModeSpecOpt fadeplot_opts =
52 {0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
55 ModStruct fadeplot_description =
56 {"fadeplot", "init_fadeplot", "draw_fadeplot", (char *) NULL,
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(ModeInfo * mi)
81 fadeplotstruct *fp = &fadeplots[MI_SCREEN(mi)];
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 MI_INIT (mi, fadeplots, free_fadeplot);
117 fp = &fadeplots[MI_SCREEN(mi)];
119 fp->width = MI_WIDTH(mi);
120 fp->height = MI_HEIGHT(mi);
121 fp->min = MAX(MIN(fp->width, fp->height) / 2, 1);
128 fp->factor.x = MAX(fp->width / (2 * fp->min), 1);
129 fp->factor.y = MAX(fp->height / (2 * fp->min), 1);
131 fp->nbstep = MI_COUNT(mi);
132 if (fp->nbstep < -MINSTEPS) {
133 fp->nbstep = NRAND(-fp->nbstep - MINSTEPS + 1) + MINSTEPS;
134 } else if (fp->nbstep < MINSTEPS)
135 fp->nbstep = MINSTEPS;
137 fp->maxpts = MI_CYCLES(mi);
141 if (fp->pts == NULL) {
142 if ((fp->pts = (XPoint *) calloc(fp->maxpts, sizeof (XPoint))) ==
148 if (MI_NPIXELS(mi) > 2)
149 fp->pix = NRAND(MI_NPIXELS(mi));
151 if (fp->stab != NULL)
152 (void) free((void *) fp->stab);
159 draw_fadeplot (ModeInfo * mi)
161 Display *display = MI_DISPLAY(mi);
162 Window window = MI_WINDOW(mi);
167 if (fadeplots == NULL)
169 fp = &fadeplots[MI_SCREEN(mi)];
170 if (fp->stab == NULL)
173 MI_IS_DRAWN(mi) = True;
174 XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
175 XDrawPoints(display, window, gc, fp->pts, fp->maxpts, CoordModeOrigin);
177 if (MI_NPIXELS(mi) > 2) {
178 XSetForeground(display, gc, MI_PIXEL(mi, fp->pix));
179 if (++fp->pix >= MI_NPIXELS(mi))
182 XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
185 for (j = 0; j < fp->nbstep; j++) {
186 for (i = 0; i < fp->maxpts / fp->nbstep; i++) {
188 fp->stab[(fp->st.x + fp->speed.x * j + i * fp->step.x) % fp->angles] *
189 fp->factor.x + fp->width / 2 - fp->min;
191 fp->stab[(fp->st.y + fp->speed.y * j + i * fp->step.y) % fp->angles] *
192 fp->factor.y + fp->height / 2 - fp->min;
196 XDrawPoints(display, window, gc, fp->pts, temp, CoordModeOrigin);
197 fp->st.x = (fp->st.x + fp->speed.x) % fp->angles;
198 fp->st.y = (fp->st.y + fp->speed.y) % fp->angles;
200 if ((fp->temps % (fp->angles / 2)) == 0) {
201 fp->temps = fp->temps % fp->angles * 5;
202 if ((fp->temps % (fp->angles)) == 0)
203 fp->speed.y = (fp->speed.y + 1) % 30 + 1;
204 if ((fp->temps % (fp->angles * 2)) == 0)
205 fp->speed.x = (fp->speed.x) % 20;
206 if ((fp->temps % (fp->angles * 3)) == 0)
207 fp->step.y = (fp->step.y + 1) % 2 + 1;
214 reshape_fadeplot(ModeInfo * mi, int width, int height)
216 fadeplotstruct *fp = &fadeplots[MI_SCREEN(mi)];
219 fp->min = MAX(MIN(fp->width, fp->height) / 2, 1);
220 fp->factor.x = MAX(fp->width / (2 * fp->min), 1);
221 fp->factor.y = MAX(fp->height / (2 * fp->min), 1);
225 refresh_fadeplot (ModeInfo * mi)
229 XSCREENSAVER_MODULE ("FadePlot", fadeplot)
231 #endif /* MODE_fadeplot */