-/* nerverot, nervous rotation of random thingies, v1.0
+/* nerverot, nervous rotation of random thingies, v1.2
* by Dan Bornstein, danfuzz@milk.com
* Copyright (c) 2000 Dan Bornstein.
*
* The goal of this screensaver is to be interesting and compelling to
* watch, yet induce a state of nervous edginess in the viewer.
*
- * Brief description of options/resources:
- *
- * -fg <color>: foreground color
- * -bg <color>: background color
- * -delay <usec>: delay between frames
- * -event-chance <frac>: chance, per iteration, that an interesting event
- * will happen (range 0..1)
- * -iter-amt <frac>: amount, per iteration, to move towards rotation and
- * scale targets (range 0..1)
- * -count <n>: number of blots
- * -colors <n>: number of colors to use
- * -lineWidth <n>: width of lines (0 means an optimized thin line)
- * -nervousness <frac>: amount of nervousness (range 0..1)
- * -min-scale <frac>: minimum scale of drawing as fraction of base scale
- * (which is the minumum of the width or height of the screen) (range
- * 0..10)
- * -max-scale <frac>: maximum scale of drawing as fraction of base scale
- * (which is the minumum of the width or height of the screen) (range
- * 0..10)
- * -min-radius <n>: minimum radius for drawing blots (range 1..100)
- * -max-radius <n>: maximum radius for drawing blots (range 1..100)
- * -max-nerve-radius <frac>: maximum nervousness radius (range 0..1)
+ * See the included man page for more details.
*/
#include <math.h>
/* random float in the range (-1..1) */
#define RAND_FLOAT_PM1 \
- (((FLOAT) (random() & 0xffff)) / ((FLOAT) 0x10000) * 2 - 1)
+ (((FLOAT) ((random() >> 8) & 0xffff)) / ((FLOAT) 0x10000) * 2 - 1)
/* random float in the range (0..1) */
#define RAND_FLOAT_01 \
- (((FLOAT) (random() & 0xffff)) / ((FLOAT) 0x10000))
+ (((FLOAT) ((random() >> 8) & 0xffff)) / ((FLOAT) 0x10000))
/* width of lines */
static int lineWidth;
+/* whether or not to do double-buffering */
+static Bool doubleBuffer;
+
/* non-user-modifiable immutable definitions */
static int centerX;
static int centerY;
-static Display *display; /* the display to draw on */
-static Window window; /* the window to draw on */
-static GC *gcs; /* array of gcs, one per color used */
+static Display *display; /* the display to draw on */
+static Window window; /* the window to draw on */
+static Drawable drawable; /* the thing to directly draw on */
+static GC *gcs; /* array of gcs, one per color used */
initBlot (&blots[n], x, y, z);
}
-
}
+
+
/* set up the initial array of blots to be a simple cube */
static void setupBlotsCube (void)
{
}
+
/* set up the initial array of blots to be a cylinder */
static void setupBlotsCylinder (void)
{
+/* set up the initial array of blots to be near the corners of a
+ * cube, distributed slightly */
+static void setupBlotsCubeCorners (void)
+{
+ int n;
+
+ blotCount = requestedBlotCount;
+ blots = calloc (sizeof (Blot), blotCount);
+
+ for (n = 0; n < blotCount; n++)
+ {
+ FLOAT x = rint (RAND_FLOAT_01) * 2 - 1;
+ FLOAT y = rint (RAND_FLOAT_01) * 2 - 1;
+ FLOAT z = rint (RAND_FLOAT_01) * 2 - 1;
+
+ x += RAND_FLOAT_PM1 * 0.3;
+ y += RAND_FLOAT_PM1 * 0.3;
+ z += RAND_FLOAT_PM1 * 0.3;
+
+ initBlot (&blots[n], x, y, z);
+ }
+
+ scaleBlotsToRadius1 ();
+}
+
+
+
+/* forward declaration for recursive use immediately below */
+static void setupBlots (void);
+
+/* set up the blots to be two of the other choices, placed next to
+ * each other */
+static void setupBlotsDuo (void)
+{
+ int origRequest = requestedBlotCount;
+ FLOAT tx, ty, tz, radius;
+ Blot *blots1, *blots2;
+ int count1, count2;
+ int n;
+
+ if (requestedBlotCount < 15)
+ {
+ /* special case bottom-out */
+ setupBlotsSphere ();
+ return;
+ }
+
+ tx = RAND_FLOAT_PM1;
+ ty = RAND_FLOAT_PM1;
+ tz = RAND_FLOAT_PM1;
+ radius = sqrt (tx * tx + ty * ty + tz * tz);
+ tx /= radius;
+ ty /= radius;
+ tz /= radius;
+
+ /* recursive call to setup set 1 */
+ requestedBlotCount = origRequest / 2;
+ setupBlots ();
+
+ if (blotCount >= origRequest)
+ {
+ /* return immediately if this satisfies the original count request */
+ return;
+ }
+
+ blots1 = blots;
+ count1 = blotCount;
+ blots = NULL;
+ blotCount = 0;
+
+ /* translate to new position */
+ for (n = 0; n < count1; n++)
+ {
+ blots1[n].x += tx;
+ blots1[n].y += ty;
+ blots1[n].z += tz;
+ }
+
+ /* recursive call to setup set 2 */
+ requestedBlotCount = origRequest - count1;
+ setupBlots ();
+ blots2 = blots;
+ count2 = blotCount;
+
+ /* translate to new position */
+ for (n = 0; n < count2; n++)
+ {
+ blots2[n].x -= tx;
+ blots2[n].y -= ty;
+ blots2[n].z -= tz;
+ }
+
+ /* combine the two arrays */
+ blotCount = count1 + count2;
+ blots = calloc (sizeof (Blot), blotCount);
+ memcpy (&blots[0], blots1, sizeof (Blot) * count1);
+ memcpy (&blots[count1], blots2, sizeof (Blot) * count2);
+ free (blots1);
+ free (blots2);
+
+ scaleBlotsToRadius1 ();
+ randomlyReorderBlots ();
+
+ /* restore the original requested count, for future iterations */
+ requestedBlotCount = origRequest;
+}
+
+
+
/* free the blots, in preparation for a new shape */
static void freeBlots (void)
{
/* set up the initial arrays of blots */
static void setupBlots (void)
{
- int which = RAND_FLOAT_01 * 4;
+ int which = RAND_FLOAT_01 * 7;
freeBlots ();
case 3:
setupBlotsSquiggle ();
break;
+ case 4:
+ setupBlotsCubeCorners ();
+ break;
+ case 5:
+ case 6:
+ setupBlotsDuo ();
+ break;
}
+}
+
+
+/* set up the segments arrays */
+static void setupSegs (void)
+{
/* there are blotShapeCount - 1 line segments per blot */
segCount = blotCount * (blotShapeCount - 1);
segsToErase = calloc (sizeof (LineSegment), segCount);
segsToDraw = calloc (sizeof (LineSegment), segCount);
/* erase the world */
- XFillRectangle (display, window, gcs[0], 0, 0, windowWidth, windowHeight);
+ XFillRectangle (display, drawable, gcs[0], 0, 0,
+ windowWidth, windowHeight);
}
centerY = windowHeight / 2;
baseScale = (xgwa.height < xgwa.width) ? xgwa.height : xgwa.width;
+ if (doubleBuffer)
+ {
+ drawable = XCreatePixmap (display, window, xgwa.width, xgwa.height,
+ xgwa.depth);
+ }
+ else
+ {
+ drawable = window;
+ }
+
setupColormap (&xgwa);
setupBlots ();
+ setupSegs ();
/* set up the initial rotation, scale, and light values as random, but
* with the targets equal to where it is */
{
itersTillNext = RAND_FLOAT_01 * 1234;
setupBlots ();
+ setupSegs ();
renderSegs ();
}
}
case 7:
{
- centerXOff = RAND_FLOAT_PM1 * maxRadius / 2;
+ centerXOff = RAND_FLOAT_PM1 * maxRadius;
break;
}
case 8:
{
- centerYOff = RAND_FLOAT_PM1 * maxRadius / 2;
+ centerYOff = RAND_FLOAT_PM1 * maxRadius;
break;
}
case 9:
{
- centerXOff = RAND_FLOAT_PM1 * maxRadius / 2;
- centerYOff = RAND_FLOAT_PM1 * maxRadius / 2;
+ centerXOff = RAND_FLOAT_PM1 * maxRadius;
+ centerYOff = RAND_FLOAT_PM1 * maxRadius;
break;
}
case 10:
for (n = 0; n < segCount; n++)
{
LineSegment *seg = &segsToErase[n];
- XDrawLine (display, window, gcs[0],
+ XDrawLine (display, drawable, gcs[0],
seg->x1, seg->y1, seg->x2, seg->y2);
seg = &segsToDraw[n];
- XDrawLine (display, window, seg->gc,
+ XDrawLine (display, drawable, seg->gc,
seg->x1, seg->y1, seg->x2, seg->y2);
}
+
+ if (doubleBuffer)
+ {
+ XCopyArea (display, drawable, window, gcs[0], 0, 0,
+ windowWidth, windowHeight, 0, 0);
+ }
}
/* do one iteration */
"*count: 250",
"*colors: 4",
"*delay: 10000",
+ "*doubleBuffer: false",
"*eventChance: 0.2",
"*iterAmt: 0.01",
"*lineWidth: 0",
XrmOptionDescRec options [] = {
{ "-count", ".count", XrmoptionSepArg, 0 },
{ "-colors", ".colors", XrmoptionSepArg, 0 },
- { "-cube", ".cube", XrmoptionNoArg, "true" },
{ "-delay", ".delay", XrmoptionSepArg, 0 },
+ { "-db", ".doubleBuffer", XrmoptionNoArg, "true" },
+ { "-no-db", ".doubleBuffer", XrmoptionNoArg, "false" },
{ "-event-chance", ".eventChance", XrmoptionSepArg, 0 },
{ "-iter-amt", ".iterAmt", XrmoptionSepArg, 0 },
{ "-line-width", ".lineWidth", XrmoptionSepArg, 0 },
fprintf (stderr, "error: delay must be at least 0\n");
problems = 1;
}
+
+ doubleBuffer = get_boolean_resource ("doubleBuffer", "Boolean");
requestedBlotCount = get_integer_resource ("count", "Count");
if (requestedBlotCount <= 0)
projects / xscreensaver / blobdiff