--- /dev/null
+/* nerverot, nervous rotation of random thingies, v1.0
+ * by Dan Bornstein, danfuzz@milk.com
+ * Copyright (c) 2000 Dan Bornstein.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation. No representations are made about the suitability of this
+ * software for any purpose. It is provided "as is" without express or
+ * implied warranty.
+ *
+ * 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)
+ */
+
+#include <math.h>
+#include "screenhack.h"
+
+#define FLOAT double
+
+/* random float in the range (-1..1) */
+#define RAND_FLOAT_PM1 \
+ (((FLOAT) (random() & 0xffff)) / ((FLOAT) 0x10000) * 2 - 1)
+
+/* random float in the range (0..1) */
+#define RAND_FLOAT_01 \
+ (((FLOAT) (random() & 0xffff)) / ((FLOAT) 0x10000))
+
+
+
+/* parameters that are user configurable */
+
+/* number of blots */
+static int requestedBlotCount;
+
+/* delay (usec) between iterations */
+int delay;
+
+/* variability of xoff/yoff per iteration (0..1) */
+static FLOAT nervousness;
+
+/* max nervousness radius (0..1) */
+static FLOAT maxNerveRadius;
+
+/* chance per iteration that an event will happen */
+static FLOAT eventChance;
+
+/* fraction (0..1) towards rotation target or scale target to move each
+ * iteration */
+static FLOAT iterAmt;
+
+/* min and max scale for drawing, as fraction of baseScale */
+static FLOAT minScale;
+static FLOAT maxScale;
+
+/* min and max radius of blot drawing */
+static int minRadius;
+static int maxRadius;
+
+/* the number of colors to use */
+static int colorCount;
+
+/* width of lines */
+static int lineWidth;
+
+
+
+/* non-user-modifiable immutable definitions */
+
+/* base scale factor for drawing, calculated as
+ * max(screenWidth,screenHeight) */
+static int baseScale;
+
+/* width and height of the window */
+static int windowWidth;
+static int windowHeight;
+
+/* center position of the window */
+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 */
+
+
+
+/* structure of the model */
+
+/* each point-like thingy to draw is represented as a blot */
+typedef struct blot_s
+{
+ FLOAT x; /* 3d x position (-1..1) */
+ FLOAT y; /* 3d y position (-1..1) */
+ FLOAT z; /* 3d z position (-1..1) */
+ FLOAT xoff[3][3]; /* display x offset per drawn point (-1..1) */
+ FLOAT yoff[3][3]; /* display x offset per drawn point (-1..1) */
+} Blot;
+
+/* each drawn line is represented as a LineSegment */
+typedef struct linesegment_s
+{
+ GC gc;
+ int x1;
+ int y1;
+ int x2;
+ int y2;
+} LineSegment;
+
+/* array of the blots in the model */
+static Blot *blots = NULL;
+static int blotCount;
+
+/* each blot draws as a simple 2d shape with each coordinate as an int
+ * in the range (-1..1); this is the base shape */
+static XPoint blotShape[] = { { 0, 0}, { 1, 0}, { 1, 1},
+ { 0, 1}, {-1, 1}, {-1, 0},
+ {-1,-1}, { 0,-1}, { 1,-1} };
+static int blotShapeCount = sizeof (blotShape) / sizeof (XPoint);
+
+/* two arrays of line segments; one for the ones to erase, and one for the
+ * ones to draw */
+static int segCount;
+static LineSegment *segsToDraw = NULL;
+static LineSegment *segsToErase = NULL;
+
+/* current rotation values per axis, scale factor, and light position */
+static FLOAT xRot;
+static FLOAT yRot;
+static FLOAT zRot;
+static FLOAT curScale;
+static FLOAT lightX;
+static FLOAT lightY;
+static FLOAT lightZ;
+
+/* target rotation values per axis, scale factor, and light position */
+static FLOAT xRotTarget;
+static FLOAT yRotTarget;
+static FLOAT zRotTarget;
+static FLOAT scaleTarget;
+static FLOAT lightXTarget;
+static FLOAT lightYTarget;
+static FLOAT lightZTarget;
+
+/* current absolute offsets from the center */
+static int centerXOff = 0;
+static int centerYOff = 0;
+
+/* iterations until the model changes */
+static int itersTillNext;
+
+
+
+/*
+ * blot setup stuff
+ */
+
+/* initialize a blot with the given coordinates and random display offsets */
+static void initBlot (Blot *b, FLOAT x, FLOAT y, FLOAT z)
+{
+ int i, j;
+
+ b->x = x;
+ b->y = y;
+ b->z = z;
+
+ for (i = 0; i < 3; i++)
+ {
+ for (j = 0; j < 3; j++)
+ {
+ b->xoff[i][j] = RAND_FLOAT_PM1;
+ b->yoff[i][j] = RAND_FLOAT_PM1;
+ }
+ }
+}
+
+/* scale the blots to have a max distance of 1 from the center */
+static void scaleBlotsToRadius1 (void)
+{
+ FLOAT max = 0.0;
+ int n;
+
+ for (n = 0; n < blotCount; n++)
+ {
+ FLOAT distSquare =
+ blots[n].x * blots[n].x +
+ blots[n].y * blots[n].y +
+ blots[n].z * blots[n].z;
+ if (distSquare > max)
+ {
+ max = distSquare;
+ }
+ }
+
+ if (max == 0.0)
+ {
+ return;
+ }
+
+ max = sqrt (max);
+
+ for (n = 0; n < blotCount; n++)
+ {
+ blots[n].x /= max;
+ blots[n].y /= max;
+ blots[n].z /= max;
+ }
+}
+
+/* randomly reorder the blots */
+static void randomlyReorderBlots (void)
+{
+ int n;
+
+ for (n = 0; n < blotCount; n++)
+ {
+ int m = RAND_FLOAT_01 * (blotCount - n) + n;
+ Blot tmpBlot = blots[n];
+ blots[n] = blots[m];
+ blots[m] = tmpBlot;
+ }
+}
+
+/* set up the initial array of blots to be a at the edge of a sphere */
+static void setupBlotsSphere (void)
+{
+ int n;
+
+ blotCount = requestedBlotCount;
+ blots = calloc (sizeof (Blot), blotCount);
+
+ for (n = 0; n < blotCount; n++)
+ {
+ /* pick a spot, but reject if its radius is < 0.2 or > 1 to
+ * avoid scaling problems */
+ FLOAT x, y, z, radius;
+
+ for (;;)
+ {
+ x = RAND_FLOAT_PM1;
+ y = RAND_FLOAT_PM1;
+ z = RAND_FLOAT_PM1;
+
+ radius = sqrt (x * x + y * y + z * z);
+ if ((radius >= 0.2) && (radius <= 1.0))
+ {
+ break;
+ }
+ }
+
+ x /= radius;
+ y /= radius;
+ z /= radius;
+
+ initBlot (&blots[n], x, y, z);
+ }
+
+}
+
+/* set up the initial array of blots to be a simple cube */
+static void setupBlotsCube (void)
+{
+ int i, j, k, n;
+
+ /* derive blotsPerEdge from blotCount, but then do the reverse
+ * since roundoff may have changed blotCount */
+ int blotsPerEdge = ((requestedBlotCount - 8) / 12) + 2;
+ FLOAT distBetween;
+
+ if (blotsPerEdge < 2)
+ {
+ blotsPerEdge = 2;
+ }
+
+ distBetween = 2.0 / (blotsPerEdge - 1.0);
+
+ blotCount = 8 + (blotsPerEdge - 2) * 12;
+ blots = calloc (sizeof (Blot), blotCount);
+ n = 0;
+
+ /* define the corners */
+ for (i = -1; i < 2; i += 2)
+ {
+ for (j = -1; j < 2; j += 2)
+ {
+ for (k = -1; k < 2; k += 2)
+ {
+ initBlot (&blots[n], i, j, k);
+ n++;
+ }
+ }
+ }
+
+ /* define the edges */
+ for (i = 1; i < (blotsPerEdge - 1); i++)
+ {
+ FLOAT varEdge = distBetween * i - 1;
+ initBlot (&blots[n++], varEdge, -1, -1);
+ initBlot (&blots[n++], varEdge, 1, -1);
+ initBlot (&blots[n++], varEdge, -1, 1);
+ initBlot (&blots[n++], varEdge, 1, 1);
+ initBlot (&blots[n++], -1, varEdge, -1);
+ initBlot (&blots[n++], 1, varEdge, -1);
+ initBlot (&blots[n++], -1, varEdge, 1);
+ initBlot (&blots[n++], 1, varEdge, 1);
+ initBlot (&blots[n++], -1, -1, varEdge);
+ initBlot (&blots[n++], 1, -1, varEdge);
+ initBlot (&blots[n++], -1, 1, varEdge);
+ initBlot (&blots[n++], 1, 1, varEdge);
+ }
+
+ scaleBlotsToRadius1 ();
+ randomlyReorderBlots ();
+}
+
+
+/* set up the initial array of blots to be a cylinder */
+static void setupBlotsCylinder (void)
+{
+ int i, j, n;
+
+ /* derive blotsPerEdge from blotCount, but then do the reverse
+ * since roundoff may have changed blotCount */
+ int blotsPerEdge = requestedBlotCount / 32;
+ FLOAT distBetween;
+
+ if (blotsPerEdge < 2)
+ {
+ blotsPerEdge = 2;
+ }
+
+ distBetween = 2.0 / (blotsPerEdge - 1);
+
+ blotCount = blotsPerEdge * 32;
+ blots = calloc (sizeof (Blot), blotCount);
+ n = 0;
+
+ /* define the edges */
+ for (i = 0; i < 32; i++)
+ {
+ FLOAT x = sin (2 * M_PI / 32 * i);
+ FLOAT y = cos (2 * M_PI / 32 * i);
+ for (j = 0; j < blotsPerEdge; j++)
+ {
+ initBlot (&blots[n], x, y, j * distBetween - 1);
+ n++;
+ }
+ }
+
+ scaleBlotsToRadius1 ();
+ randomlyReorderBlots ();
+}
+
+
+
+/* set up the initial array of blots to be a squiggle */
+static void setupBlotsSquiggle (void)
+{
+ FLOAT x, y, z, xv, yv, zv, len;
+ int n;
+
+ blotCount = requestedBlotCount;
+ blots = calloc (sizeof (Blot), blotCount);
+
+ x = RAND_FLOAT_PM1;
+ y = RAND_FLOAT_PM1;
+ z = RAND_FLOAT_PM1;
+
+ xv = RAND_FLOAT_PM1;
+ yv = RAND_FLOAT_PM1;
+ zv = RAND_FLOAT_PM1;
+ len = sqrt (xv * xv + yv * yv + zv * zv);
+ xv /= len;
+ yv /= len;
+ zv /= len;
+
+ for (n = 0; n < blotCount; n++)
+ {
+ FLOAT newx, newy, newz;
+ initBlot (&blots[n], x, y, z);
+
+ for (;;)
+ {
+ xv += RAND_FLOAT_PM1 * 0.1;
+ yv += RAND_FLOAT_PM1 * 0.1;
+ zv += RAND_FLOAT_PM1 * 0.1;
+ len = sqrt (xv * xv + yv * yv + zv * zv);
+ xv /= len;
+ yv /= len;
+ zv /= len;
+
+ newx = x + xv * 0.1;
+ newy = y + yv * 0.1;
+ newz = z + zv * 0.1;
+
+ if ( (newx >= -1) && (newx <= 1)
+ && (newy >= -1) && (newy <= 1)
+ && (newz >= -1) && (newz <= 1))
+ {
+ break;
+ }
+ }
+
+ x = newx;
+ y = newy;
+ z = newz;
+ }
+
+ scaleBlotsToRadius1 ();
+ randomlyReorderBlots ();
+}
+
+
+
+/* free the blots, in preparation for a new shape */
+static void freeBlots (void)
+{
+ if (blots != NULL)
+ {
+ free (blots);
+ blots = NULL;
+ }
+
+ if (segsToErase != NULL)
+ {
+ free (segsToErase);
+ segsToErase = NULL;
+ }
+
+ if (segsToDraw != NULL)
+ {
+ free (segsToDraw);
+ segsToDraw = NULL;
+ }
+}
+
+
+
+/* set up the initial arrays of blots */
+static void setupBlots (void)
+{
+ int which = RAND_FLOAT_01 * 4;
+
+ freeBlots ();
+
+ switch (which)
+ {
+ case 0:
+ setupBlotsCube ();
+ break;
+ case 1:
+ setupBlotsSphere ();
+ break;
+ case 2:
+ setupBlotsCylinder ();
+ break;
+ case 3:
+ setupBlotsSquiggle ();
+ break;
+ }
+
+ /* 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);
+}
+
+
+
+/*
+ * color setup stuff
+ */
+
+/* set up the colormap */
+static void setupColormap (XWindowAttributes *xgwa)
+{
+ int n;
+ XGCValues gcv;
+ XColor *colors = (XColor *) calloc (sizeof (XColor), colorCount + 1);
+
+ unsigned short r, g, b;
+ int h1, h2;
+ double s1, s2, v1, v2;
+
+ r = RAND_FLOAT_01 * 0x10000;
+ g = RAND_FLOAT_01 * 0x10000;
+ b = RAND_FLOAT_01 * 0x10000;
+ rgb_to_hsv (r, g, b, &h1, &s1, &v1);
+ v1 = 1.0;
+ s1 = 1.0;
+
+ r = RAND_FLOAT_01 * 0x10000;
+ g = RAND_FLOAT_01 * 0x10000;
+ b = RAND_FLOAT_01 * 0x10000;
+ rgb_to_hsv (r, g, b, &h2, &s2, &v2);
+ s2 = 0.7;
+ v2 = 0.7;
+
+ colors[0].pixel = get_pixel_resource ("background", "Background",
+ display, xgwa->colormap);
+
+ make_color_ramp (display, xgwa->colormap, h1, s1, v1, h2, s2, v2,
+ colors + 1, &colorCount, False, True, False);
+
+ if (colorCount < 1)
+ {
+ fprintf (stderr, "%s: couldn't allocate any colors\n", progname);
+ exit (-1);
+ }
+
+ gcs = (GC *) calloc (sizeof (GC), colorCount + 1);
+
+ for (n = 0; n <= colorCount; n++)
+ {
+ gcv.foreground = colors[n].pixel;
+ gcv.line_width = lineWidth;
+ gcs[n] = XCreateGC (display, window, GCForeground | GCLineWidth, &gcv);
+ }
+
+ free (colors);
+}
+
+
+
+/*
+ * overall setup stuff
+ */
+
+/* set up the system */
+static void setup (void)
+{
+ XWindowAttributes xgwa;
+
+ XGetWindowAttributes (display, window, &xgwa);
+
+ windowWidth = xgwa.width;
+ windowHeight = xgwa.height;
+ centerX = windowWidth / 2;
+ centerY = windowHeight / 2;
+ baseScale = (xgwa.height < xgwa.width) ? xgwa.height : xgwa.width;
+
+ setupColormap (&xgwa);
+ setupBlots ();
+
+ /* set up the initial rotation, scale, and light values as random, but
+ * with the targets equal to where it is */
+ xRot = xRotTarget = RAND_FLOAT_01 * M_PI;
+ yRot = yRotTarget = RAND_FLOAT_01 * M_PI;
+ zRot = zRotTarget = RAND_FLOAT_01 * M_PI;
+ curScale = scaleTarget = RAND_FLOAT_01 * (maxScale - minScale) + minScale;
+ lightX = lightXTarget = RAND_FLOAT_PM1;
+ lightY = lightYTarget = RAND_FLOAT_PM1;
+ lightZ = lightZTarget = RAND_FLOAT_PM1;
+
+ itersTillNext = RAND_FLOAT_01 * 1234;
+}
+
+
+
+/*
+ * the simulation
+ */
+
+/* "render" the blots into segsToDraw, with the current rotation factors */
+static void renderSegs (void)
+{
+ int n;
+ int m = 0;
+
+ /* rotation factors */
+ FLOAT sinX = sin (xRot);
+ FLOAT cosX = cos (xRot);
+ FLOAT sinY = sin (yRot);
+ FLOAT cosY = cos (yRot);
+ FLOAT sinZ = sin (zRot);
+ FLOAT cosZ = cos (zRot);
+
+ for (n = 0; n < blotCount; n++)
+ {
+ Blot *b = &blots[n];
+ int i, j;
+ int baseX, baseY;
+ FLOAT radius;
+ int x[3][3];
+ int y[3][3];
+ int color;
+
+ FLOAT x1 = blots[n].x;
+ FLOAT y1 = blots[n].y;
+ FLOAT z1 = blots[n].z;
+ FLOAT x2, y2, z2;
+
+ /* rotate on z axis */
+ x2 = x1 * cosZ - y1 * sinZ;
+ y2 = x1 * sinZ + y1 * cosZ;
+ z2 = z1;
+
+ /* rotate on x axis */
+ y1 = y2 * cosX - z2 * sinX;
+ z1 = y2 * sinX + z2 * cosX;
+ x1 = x2;
+
+ /* rotate on y axis */
+ z2 = z1 * cosY - x1 * sinY;
+ x2 = z1 * sinY + x1 * cosY;
+ y2 = y1;
+
+ /* the color to draw is based on the distance from the light of
+ * the post-rotation blot */
+ x1 = x2 - lightX;
+ y1 = y2 - lightY;
+ z1 = z2 - lightZ;
+ color = 1 + (x1 * x1 + y1 * y1 + z1 * z1) / 4 * colorCount;
+ if (color > colorCount)
+ {
+ color = colorCount;
+ }
+
+ /* set up the base screen coordinates for drawing */
+ baseX = x2 / 2 * baseScale * curScale + centerX + centerXOff;
+ baseY = y2 / 2 * baseScale * curScale + centerY + centerYOff;
+
+ radius = (z2 + 1) / 2 * (maxRadius - minRadius) + minRadius;
+
+ for (i = 0; i < 3; i++)
+ {
+ for (j = 0; j < 3; j++)
+ {
+ x[i][j] = baseX +
+ ((i - 1) + (b->xoff[i][j] * maxNerveRadius)) * radius;
+ y[i][j] = baseY +
+ ((j - 1) + (b->yoff[i][j] * maxNerveRadius)) * radius;
+ }
+ }
+
+ for (i = 1; i < blotShapeCount; i++)
+ {
+ segsToDraw[m].gc = gcs[color];
+ segsToDraw[m].x1 = x[blotShape[i-1].x + 1][blotShape[i-1].y + 1];
+ segsToDraw[m].y1 = y[blotShape[i-1].x + 1][blotShape[i-1].y + 1];
+ segsToDraw[m].x2 = x[blotShape[i].x + 1][blotShape[i].y + 1];
+ segsToDraw[m].y2 = y[blotShape[i].x + 1][blotShape[i].y + 1];
+ m++;
+ }
+ }
+}
+
+/* update blots, adjusting the offsets and rotation factors. */
+static void updateWithFeeling (void)
+{
+ int n, i, j;
+
+ /* pick a new model if the time is right */
+ itersTillNext--;
+ if (itersTillNext < 0)
+ {
+ itersTillNext = RAND_FLOAT_01 * 1234;
+ setupBlots ();
+ renderSegs ();
+ }
+
+ /* update the rotation factors by moving them a bit toward the targets */
+ xRot = xRot + (xRotTarget - xRot) * iterAmt;
+ yRot = yRot + (yRotTarget - yRot) * iterAmt;
+ zRot = zRot + (zRotTarget - zRot) * iterAmt;
+
+ /* similarly the scale factor */
+ curScale = curScale + (scaleTarget - curScale) * iterAmt;
+
+ /* and similarly the light position */
+ lightX = lightX + (lightXTarget - lightX) * iterAmt;
+ lightY = lightY + (lightYTarget - lightY) * iterAmt;
+ lightZ = lightZ + (lightZTarget - lightZ) * iterAmt;
+
+ /* for each blot... */
+ for (n = 0; n < blotCount; n++)
+ {
+ /* add a bit of random jitter to xoff/yoff */
+ for (i = 0; i < 3; i++)
+ {
+ for (j = 0; j < 3; j++)
+ {
+ FLOAT newOff;
+
+ newOff = blots[n].xoff[i][j] + RAND_FLOAT_PM1 * nervousness;
+ if (newOff < -1) newOff = -(newOff + 1) - 1;
+ else if (newOff > 1) newOff = -(newOff - 1) + 1;
+ blots[n].xoff[i][j] = newOff;
+
+ newOff = blots[n].yoff[i][j] + RAND_FLOAT_PM1 * nervousness;
+ if (newOff < -1) newOff = -(newOff + 1) - 1;
+ else if (newOff > 1) newOff = -(newOff - 1) + 1;
+ blots[n].yoff[i][j] = newOff;
+ }
+ }
+ }
+
+ /* depending on random chance, update one or more factors */
+ if (RAND_FLOAT_01 <= eventChance)
+ {
+ int which = RAND_FLOAT_01 * 14;
+ switch (which)
+ {
+ case 0:
+ {
+ xRotTarget = RAND_FLOAT_PM1 * M_PI * 2;
+ break;
+ }
+ case 1:
+ {
+ yRotTarget = RAND_FLOAT_PM1 * M_PI * 2;
+ break;
+ }
+ case 2:
+ {
+ zRotTarget = RAND_FLOAT_PM1 * M_PI * 2;
+ break;
+ }
+ case 3:
+ {
+ xRotTarget = RAND_FLOAT_PM1 * M_PI * 2;
+ yRotTarget = RAND_FLOAT_PM1 * M_PI * 2;
+ break;
+ }
+ case 4:
+ {
+ xRotTarget = RAND_FLOAT_PM1 * M_PI * 2;
+ zRotTarget = RAND_FLOAT_PM1 * M_PI * 2;
+ break;
+ }
+ case 5:
+ {
+ yRotTarget = RAND_FLOAT_PM1 * M_PI * 2;
+ zRotTarget = RAND_FLOAT_PM1 * M_PI * 2;
+ break;
+ }
+ case 6:
+ {
+ xRotTarget = RAND_FLOAT_PM1 * M_PI * 2;
+ yRotTarget = RAND_FLOAT_PM1 * M_PI * 2;
+ zRotTarget = RAND_FLOAT_PM1 * M_PI * 2;
+ break;
+ }
+ case 7:
+ {
+ centerXOff = RAND_FLOAT_PM1 * maxRadius / 2;
+ break;
+ }
+ case 8:
+ {
+ centerYOff = RAND_FLOAT_PM1 * maxRadius / 2;
+ break;
+ }
+ case 9:
+ {
+ centerXOff = RAND_FLOAT_PM1 * maxRadius / 2;
+ centerYOff = RAND_FLOAT_PM1 * maxRadius / 2;
+ break;
+ }
+ case 10:
+ {
+ scaleTarget =
+ RAND_FLOAT_01 * (maxScale - minScale) + minScale;
+ break;
+ }
+ case 11:
+ {
+ curScale =
+ RAND_FLOAT_01 * (maxScale - minScale) + minScale;
+ break;
+ }
+ case 12:
+ {
+ lightX = RAND_FLOAT_PM1;
+ lightY = RAND_FLOAT_PM1;
+ lightZ = RAND_FLOAT_PM1;
+ break;
+ }
+ case 13:
+ {
+ lightXTarget = RAND_FLOAT_PM1;
+ lightYTarget = RAND_FLOAT_PM1;
+ lightZTarget = RAND_FLOAT_PM1;
+ break;
+ }
+ }
+ }
+}
+
+/* erase segsToErase and draw segsToDraw */
+static void eraseAndDraw (void)
+{
+ int n;
+
+ for (n = 0; n < segCount; n++)
+ {
+ LineSegment *seg = &segsToErase[n];
+ XDrawLine (display, window, gcs[0],
+ seg->x1, seg->y1, seg->x2, seg->y2);
+ seg = &segsToDraw[n];
+ XDrawLine (display, window, seg->gc,
+ seg->x1, seg->y1, seg->x2, seg->y2);
+ }
+}
+
+/* do one iteration */
+static void oneIteration (void)
+{
+ /* switch segsToErase and segsToDraw */
+ LineSegment *temp = segsToDraw;
+ segsToDraw = segsToErase;
+ segsToErase = temp;
+
+ /* update the model */
+ updateWithFeeling ();
+
+ /* render new segments */
+ renderSegs ();
+
+ /* erase old segments and draw new ones */
+ eraseAndDraw ();
+}
+
+char *progclass = "NerveRot";
+
+char *defaults [] = {
+ ".background: black",
+ ".foreground: white",
+ "*count: 250",
+ "*colors: 4",
+ "*delay: 10000",
+ "*eventChance: 0.2",
+ "*iterAmt: 0.01",
+ "*lineWidth: 0",
+ "*minScale: 0.6",
+ "*maxScale: 1.75",
+ "*minRadius: 3",
+ "*maxRadius: 25",
+ "*maxNerveRadius: 0.7",
+ "*nervousness: 0.3",
+ 0
+};
+
+XrmOptionDescRec options [] = {
+ { "-count", ".count", XrmoptionSepArg, 0 },
+ { "-colors", ".colors", XrmoptionSepArg, 0 },
+ { "-cube", ".cube", XrmoptionNoArg, "true" },
+ { "-delay", ".delay", XrmoptionSepArg, 0 },
+ { "-event-chance", ".eventChance", XrmoptionSepArg, 0 },
+ { "-iter-amt", ".iterAmt", XrmoptionSepArg, 0 },
+ { "-line-width", ".lineWidth", XrmoptionSepArg, 0 },
+ { "-min-scale", ".minScale", XrmoptionSepArg, 0 },
+ { "-max-scale", ".maxScale", XrmoptionSepArg, 0 },
+ { "-min-radius", ".minRadius", XrmoptionSepArg, 0 },
+ { "-max-radius", ".maxRadius", XrmoptionSepArg, 0 },
+ { "-max-nerve-radius", ".maxNerveRadius", XrmoptionSepArg, 0 },
+ { "-nervousness", ".nervousness", XrmoptionSepArg, 0 },
+ { 0, 0, 0, 0 }
+};
+
+/* initialize the user-specifiable params */
+static void initParams (void)
+{
+ int problems = 0;
+
+ delay = get_integer_resource ("delay", "Delay");
+ if (delay < 0)
+ {
+ fprintf (stderr, "error: delay must be at least 0\n");
+ problems = 1;
+ }
+
+ requestedBlotCount = get_integer_resource ("count", "Count");
+ if (requestedBlotCount <= 0)
+ {
+ fprintf (stderr, "error: count must be at least 0\n");
+ problems = 1;
+ }
+
+ colorCount = get_integer_resource ("colors", "Colors");
+ if (colorCount <= 0)
+ {
+ fprintf (stderr, "error: colors must be at least 1\n");
+ problems = 1;
+ }
+
+ lineWidth = get_integer_resource ("lineWidth", "LineWidth");
+ if (lineWidth < 0)
+ {
+ fprintf (stderr, "error: line width must be at least 0\n");
+ problems = 1;
+ }
+
+ nervousness = get_float_resource ("nervousness", "Float");
+ if ((nervousness < 0) || (nervousness > 1))
+ {
+ fprintf (stderr, "error: nervousness must be in the range 0..1\n");
+ problems = 1;
+ }
+
+ maxNerveRadius = get_float_resource ("maxNerveRadius", "Float");
+ if ((maxNerveRadius < 0) || (maxNerveRadius > 1))
+ {
+ fprintf (stderr, "error: maxNerveRadius must be in the range 0..1\n");
+ problems = 1;
+ }
+
+ eventChance = get_float_resource ("eventChance", "Float");
+ if ((eventChance < 0) || (eventChance > 1))
+ {
+ fprintf (stderr, "error: eventChance must be in the range 0..1\n");
+ problems = 1;
+ }
+
+ iterAmt = get_float_resource ("iterAmt", "Float");
+ if ((iterAmt < 0) || (iterAmt > 1))
+ {
+ fprintf (stderr, "error: iterAmt must be in the range 0..1\n");
+ problems = 1;
+ }
+
+ minScale = get_float_resource ("minScale", "Float");
+ if ((minScale < 0) || (minScale > 10))
+ {
+ fprintf (stderr, "error: minScale must be in the range 0..10\n");
+ problems = 1;
+ }
+
+ maxScale = get_float_resource ("maxScale", "Float");
+ if ((maxScale < 0) || (maxScale > 10))
+ {
+ fprintf (stderr, "error: maxScale must be in the range 0..10\n");
+ problems = 1;
+ }
+
+ if (maxScale < minScale)
+ {
+ fprintf (stderr, "error: maxScale must be >= minScale\n");
+ problems = 1;
+ }
+
+ minRadius = get_integer_resource ("minRadius", "Integer");
+ if ((minRadius < 1) || (minRadius > 100))
+ {
+ fprintf (stderr, "error: minRadius must be in the range 1..100\n");
+ problems = 1;
+ }
+
+ maxRadius = get_integer_resource ("maxRadius", "Integer");
+ if ((maxRadius < 1) || (maxRadius > 100))
+ {
+ fprintf (stderr, "error: maxRadius must be in the range 1..100\n");
+ problems = 1;
+ }
+
+ if (maxRadius < minRadius)
+ {
+ fprintf (stderr, "error: maxRadius must be >= minRadius\n");
+ problems = 1;
+ }
+
+ if (problems)
+ {
+ exit (1);
+ }
+}
+
+/* main function */
+void screenhack (Display *dpy, Window win)
+{
+ display = dpy;
+ window = win;
+
+ initParams ();
+ setup ();
+
+ /* make a valid set to erase at first */
+ renderSegs ();
+
+ for (;;)
+ {
+ oneIteration ();
+ XSync (dpy, False);
+ screenhack_handle_events (dpy);
+ usleep (delay);
+ }
+}
projects / xscreensaver / blobdiff