X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=hacks%2Ffadeplot.c;fp=hacks%2Ffadeplot.c;h=5b7155223c4c5ab8da5d213402ed74ed3d9c2694;hb=df7adbee81405e2849728a24b498ad2117784b1f;hp=0000000000000000000000000000000000000000;hpb=41fae2ad67bc37e31c4d967bae81e4f3f50fa55a;p=xscreensaver

diff --git a/hacks/fadeplot.c b/hacks/fadeplot.c
new file mode 100644
index 00000000..5b715522
--- /dev/null
+++ b/hacks/fadeplot.c
@@ -0,0 +1,177 @@
+/* -*- 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 */
+}