--- /dev/null
+/* -*- Mode: C; tab-width: 4 -*-
+ * fadeplot.c --- some easy plotting stuff, by Bas van Gaalen, Holland, PD
+ */
+#if !defined( lint ) && !defined( SABER )
+static const char sccsid[] = "@(#)fadeplot.c 4.04 97/07/26 xlockmore";
+#endif
+
+/* Converted for xlock by Charles Vidal
+ * See xlock.c for copying information.
+ *
+ * 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.
+ */
+
+/*-
+ 1) Not random enough, i.e. always same starting position.
+ 2) Needs to be less flashy
+ */
+
+#ifdef STANDALONE
+# define PROGCLASS "Fadeplot"
+# define HACK_INIT init_fadeplot
+# define HACK_DRAW draw_fadeplot
+# define fadeplot_opts xlockmore_opts
+# define DEFAULTS "*count: 10 \n" \
+ "*delay: 30000 \n" \
+ "*cycles: 1500 \n" \
+ "*ncolors: 64 \n"
+# define BRIGHT_COLORS
+# define UNIFORM_COLORS
+# include "xlockmore.h" /* from the xscreensaver distribution */
+#else /* STANDALONE */
+# include "xlock.h" /* from the xlockmore distribution */
+#endif /* STANDALONE */
+
+ModeSpecOpt fadeplot_opts = {
+ 0, NULL, 0, NULL, NULL };
+
+#define MINSTEPS 1
+#define ANGLES 1000
+
+typedef struct {
+ XPoint speed, step, factor, st;
+ int temps, maxpts, nbstep;
+ int min;
+ int width, height;
+ int pix;
+ int stab[ANGLES];
+ XPoint *pts;
+} fadeplotstruct;
+
+static fadeplotstruct *fadeplots = NULL;
+
+static void
+initSintab(ModeInfo * mi)
+{
+ fadeplotstruct *fp = &fadeplots[MI_SCREEN(mi)];
+ int i;
+ float x;
+
+ for (i = 0; i < ANGLES; i++) {
+ x = SINF(i * 2 * M_PI / ANGLES);
+ fp->stab[i] = (int) (x * ABS(x) * fp->min) + fp->min;
+ }
+}
+
+void
+init_fadeplot(ModeInfo * mi)
+{
+ fadeplotstruct *fp;
+
+ if (fadeplots == NULL) {
+ if ((fadeplots = (fadeplotstruct *) calloc(MI_NUM_SCREENS(mi),
+ sizeof (fadeplotstruct))) == NULL)
+ return;
+ }
+ fp = &fadeplots[MI_SCREEN(mi)];
+
+ fp->width = MI_WIN_WIDTH(mi);
+ fp->height = MI_WIN_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_BATCHCOUNT(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)
+ fp->pts = (XPoint *) calloc(fp->maxpts, sizeof (XPoint));
+ if (MI_NPIXELS(mi) > 2)
+ fp->pix = NRAND(MI_NPIXELS(mi));
+
+ initSintab(mi);
+
+ XClearWindow(MI_DISPLAY(mi), MI_WINDOW(mi));
+}
+
+void
+draw_fadeplot(ModeInfo * mi)
+{
+ fadeplotstruct *fp = &fadeplots[MI_SCREEN(mi)];
+ Display *display = MI_DISPLAY(mi);
+ Window window = MI_WINDOW(mi);
+ GC gc = MI_GC(mi);
+ int i, j;
+ long temp;
+
+ XSetForeground(display, gc, MI_WIN_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_WIN_WHITE_PIXEL(mi));
+
+ for (temp = fp->nbstep - 1; temp >= 0; temp--) {
+ j = temp;
+ for (i = 0; i < fp->maxpts / fp->nbstep; i++) {
+ fp->pts[temp * i + i].x =
+ fp->stab[(fp->st.x + fp->speed.x * j + i * fp->step.x) % ANGLES] *
+ fp->factor.x + fp->width / 2 - fp->min;
+ fp->pts[temp * i + i].y =
+ fp->stab[(fp->st.y + fp->speed.y * j + i * fp->step.y) % ANGLES] *
+ fp->factor.y + fp->height / 2 - fp->min;
+ }
+ }
+ XDrawPoints(display, window, gc, fp->pts, fp->maxpts, CoordModeOrigin);
+ XFlush(display);
+ fp->st.x = (fp->st.x + fp->speed.x) % ANGLES;
+ fp->st.y = (fp->st.y + fp->speed.y) % ANGLES;
+ fp->temps++;
+ if ((fp->temps % (ANGLES / 2)) == 0) {
+ fp->temps = fp->temps % ANGLES * 5;
+ if ((fp->temps % (ANGLES)) == 0)
+ fp->speed.y = (fp->speed.y++) % 30 + 1;
+ if ((fp->temps % (ANGLES * 2)) == 0)
+ fp->speed.x = (fp->speed.x) % 20;
+ if ((fp->temps % (ANGLES * 3)) == 0)
+ fp->step.y = (fp->step.y++) % 2 + 1;
+ XClearWindow(display, window);
+ }
+}
+void
+refresh_fadeplot(ModeInfo * mi)
+{
+
+}
+
+void
+release_fadeplot(ModeInfo * mi)
+{
+ /* Do nothing, it will refresh by itself */
+}
projects / xscreensaver / blobdiff