--- /dev/null
+/* -*- Mode: C; tab-width: 4 -*- */
+/*-
+ * ant --- Chris Langton's generalized turing machine ants (also known
+ * as Greg Turk's turmites) whose tape is the screen
+ */
+
+#if !defined( lint ) && !defined( SABER )
+static const char sccsid[] = "@(#)ant.c 4.11 98/06/18 xlockmore";
+
+#endif
+
+/*-
+ * Copyright (c) 1995 by David Bagley.
+ *
+ * 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.
+ *
+ * Revision History:
+ * 10-May-97: Compatible with xscreensaver
+ * 16-Apr-97: -neighbors 3 and 8 added
+ * 01-Jan-97: Updated ant.c to handle more kinds of ants. Thanks to
+ * J Austin David <Austin.David@tlogic.com>. Check it out in
+ * java at http://havoc.gtf.gatech.edu/austin He thought up the
+ * new Ladder ant.
+ * 04-Apr-96: -neighbors 6 runtime-time option added for hexagonal ants
+ * (bees), coded from an idea of Jim Propp's in Science News,
+ * Oct 28, 1995 VOL. 148 page 287
+ * 20-Sep-95: Memory leak in ant fixed. Now random colors.
+ * 05-Sep-95: Coded from A.K. Dewdney's "Computer Recreations", Scientific
+ * American Magazine" Sep 1989 pp 180-183, Mar 1990 p 121
+ * Also used Ian Stewart's Mathematical Recreations, Scientific
+ * American Jul 1994 pp 104-107
+ * also used demon.c and life.c as a guide.
+ */
+
+/*-
+ Species Grid Number of Neigbors
+ ------- ---- ------------------
+ Ants Square 4 (or 8)
+ Bees Hexagon 6
+ Bees Triangle 3 (or 9, 12)
+
+ Neighbors 6 and neighbors 3 produce the same Turk ants.
+*/
+
+#ifdef STANDALONE
+# define PROGCLASS "Ant"
+# define HACK_INIT init_ant
+# define HACK_DRAW draw_ant
+# define ant_opts xlockmore_opts
+# define DEFAULTS "*delay: 1000 \n" \
+ "*count: -3 \n" \
+ "*cycles: 40000 \n" \
+ "*size: -12 \n" \
+ "*ncolors: 64 \n" \
+ "*neighbors: 0 \n" \
+ "*sharpturn: False \n"
+# include "xlockmore.h" /* in xscreensaver distribution */
+# include "erase.h"
+#else /* STANDALONE */
+# include "xlock.h" /* in xlockmore distribution */
+#endif /* STANDALONE */
+
+#include "automata.h"
+
+/*-
+ * neighbors of 0 randomizes it between 3, 4 and 6.
+ * 8, 9 12 are available also but not recommended.
+ */
+
+#ifdef STANDALONE
+static int neighbors;
+#else
+extern int neighbors;
+#endif /* !STANDALONE */
+
+#define DEF_TRUCHET "False"
+#define DEF_SHARPTURN "False"
+#define DEF_NEIGHBORS "0"
+
+static Bool truchet;
+static Bool sharpturn;
+
+static XrmOptionDescRec opts[] =
+{
+ {"-truchet", ".ant.truchet", XrmoptionNoArg, (caddr_t) "on"},
+ {"+truchet", ".ant.truchet", XrmoptionNoArg, (caddr_t) "off"},
+ {"-sharpturn", ".ant.sharpturn", XrmoptionNoArg, (caddr_t) "on"},
+ {"+sharpturn", ".ant.sharpturn", XrmoptionNoArg, (caddr_t) "off"},
+
+#ifdef STANDALONE
+ {"-neighbors", ".ant.neighbors", XrmoptionSepArg, (caddr_t) 0},
+ {"+neighbors", ".ant.neighbors", XrmoptionSepArg, (caddr_t) 0}
+#endif /* STANDALONE */
+
+};
+static argtype vars[] =
+{
+ {(caddr_t *) & truchet, "truchet", "Truchet", DEF_TRUCHET, t_Bool},
+ {(caddr_t *) & sharpturn, "sharpturn", "SharpTurn", DEF_SHARPTURN, t_Bool},
+#ifdef STANDALONE
+ {(caddr_t *) & neighbors, "neighbors", "Neighbors", DEF_NEIGHBORS, t_Int}
+#endif /* STANDALONE */
+};
+static OptionStruct desc[] =
+{
+ {"-/+truchet", "turn on/off Truchet lines"},
+ {"-/+sharpturn", "turn on/off sharp turns (6 or 12 neighbors only)"}
+};
+
+ModeSpecOpt ant_opts =
+{sizeof opts / sizeof opts[0], opts, sizeof vars / sizeof vars[0], vars, desc};
+
+#ifdef USE_MODULES
+ModStruct ant_description =
+{"ant", "init_ant", "draw_ant", "release_ant",
+ "refresh_ant", "init_ant", NULL, &ant_opts,
+ 1000, -3, 40000, -12, 64, 1.0, "",
+ "Shows Langton's and Turk's generalized ants", 0, NULL};
+
+#endif
+
+#define ANTBITS(n,w,h)\
+ ap->pixmaps[ap->init_bits++]=\
+ XCreatePixmapFromBitmapData(display,window,(char *)n,w,h,1,0,1)
+
+/* If you change the table you may have to change the following 2 constants */
+#define STATES 2
+#define MINANTS 1
+#define REDRAWSTEP 2000 /* How much tape to draw per cycle */
+#define MINGRIDSIZE 24
+#define MINSIZE 1
+#define MINRANDOMSIZE 5
+#define ANGLES 360
+
+
+typedef struct {
+ unsigned char color;
+ short direction;
+ unsigned char next;
+} statestruct;
+
+typedef struct {
+ int col, row;
+ short direction;
+ unsigned char state;
+} antstruct;
+
+typedef struct {
+ Bool painted;
+ int neighbors;
+ int generation;
+ int xs, ys;
+ int xb, yb;
+ int nrows, ncols;
+ int width, height;
+ unsigned char ncolors, nstates;
+ int n;
+ int redrawing, redrawpos;
+ int truchet; /* Only for Turk modes */
+ int sharpturn; /* Only for even neighbors > 4 (i.e. 6 and 12) */
+ statestruct machine[NUMSTIPPLES * STATES];
+ unsigned char *tape;
+ unsigned char *truchet_state;
+ antstruct *ants;
+ int init_bits;
+ unsigned char colors[NUMSTIPPLES - 1];
+ GC stippledGC;
+ Pixmap pixmaps[NUMSTIPPLES - 1];
+ union {
+ XPoint hexagon[7]; /* Need more than 6 for truchet */
+ XPoint triangle[2][4]; /* Need more than 3 for truchet */
+ } shape;
+} antfarmstruct;
+
+static char plots[] =
+{3,
+#if 1 /* Without this... this mode is misnamed... */
+ 4,
+#endif
+ 6}; /* Neighborhoods, 8 just makes a mess */
+
+#define NEIGHBORKINDS (long) (sizeof plots / sizeof *plots)
+
+/* Relative ant moves */
+#define FS 0 /* Step */
+#define TRS 1 /* Turn right, then step */
+#define THRS 2 /* Turn hard right, then step */
+#define TBS 3 /* Turn back, then step */
+#define THLS 4 /* Turn hard left, then step */
+#define TLS 5 /* Turn left, then step */
+#define SF 6 /* Step */
+#define STR 7 /* Step then turn right */
+#define STHR 8 /* Step then turn hard right */
+#define STB 9 /* Step then turn back */
+#define STHL 10 /* Step then turn hard left */
+#define STL 11 /* Step then turn left */
+
+static antfarmstruct *antfarms = NULL;
+
+/* LANGTON'S ANT (10) Chaotic after 500, Builder after 10,000 (104p) */
+/* TURK'S 100 ANT Always chaotic?, tested past 150,000,000 */
+/* TURK'S 101 ANT Always chaotic? */
+/* TURK'S 110 ANT Builder at 150 (18p) */
+/* TURK'S 1000 ANT Always chaotic? */
+/* TURK'S 1100 SYMMETRIC ANT all even run 1's and 0's are symmetric */
+/* other examples 1001, 110011, 110000, 1001101 */
+/* TURK'S 1101 ANT Builder after 250,000 (388p) */
+/* Once saw a chess horse type builder (i.e. non-45 degree builder) */
+
+/* BEE ONLY */
+/* All alternating 10 appear symmetric, no proof (i.e. 10, 1010, etc) */
+/* Even runs of 0's and 1's are also symmetric */
+/* I have seen Hexagonal builders but they are more rare. */
+
+static unsigned char tables[][3 * NUMSTIPPLES * STATES + 2] =
+{
+#if 0
+ /* Here just so you can figure out notation */
+ { /* Langton's ant */
+ 2, 1,
+ 1, TLS, 0, 0, TRS, 0
+ },
+#else
+ /* First 2 numbers are the size (ncolors, nstates) */
+ { /* LADDER BUILDER */
+ 4, 1,
+ 1, STR, 0, 2, STL, 0, 3, TRS, 0, 0, TLS, 0
+ },
+ { /* SPIRALING PATTERN */
+ 2, 2,
+ 1, TLS, 0, 0, FS, 1,
+ 1, TRS, 0, 1, TRS, 0
+ },
+ { /* SQUARE (HEXAGON) BUILDER */
+ 2, 2,
+ 1, TLS, 0, 0, FS, 1,
+ 0, TRS, 0, 1, TRS, 0
+ },
+#endif
+};
+
+#define NTABLES (sizeof tables / sizeof tables[0])
+
+static void
+position_of_neighbor(antfarmstruct * ap, int dir, int *pcol, int *prow)
+{
+ int col = *pcol, row = *prow;
+
+ if (ap->neighbors == 6) {
+ switch (dir) {
+ case 0:
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ break;
+ case 60:
+ if (!(row & 1))
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ row = (!row) ? ap->nrows - 1 : row - 1;
+ break;
+ case 120:
+ if (row & 1)
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ row = (!row) ? ap->nrows - 1 : row - 1;
+ break;
+ case 180:
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ break;
+ case 240:
+ if (row & 1)
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ row = (row + 1 == ap->nrows) ? 0 : row + 1;
+ break;
+ case 300:
+ if (!(row & 1))
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ row = (row + 1 == ap->nrows) ? 0 : row + 1;
+ break;
+ default:
+ (void) fprintf(stderr, "wrong direction %d\n", dir);
+ }
+ } else if (ap->neighbors == 4 || ap->neighbors == 8) {
+ switch (dir) {
+ case 0:
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ break;
+ case 45:
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ row = (!row) ? ap->nrows - 1 : row - 1;
+ break;
+ case 90:
+ row = (!row) ? ap->nrows - 1 : row - 1;
+ break;
+ case 135:
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ row = (!row) ? ap->nrows - 1 : row - 1;
+ break;
+ case 180:
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ break;
+ case 225:
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ row = (row + 1 == ap->nrows) ? 0 : row + 1;
+ break;
+ case 270:
+ row = (row + 1 == ap->nrows) ? 0 : row + 1;
+ break;
+ case 315:
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ row = (row + 1 == ap->nrows) ? 0 : row + 1;
+ break;
+ default:
+ (void) fprintf(stderr, "wrong direction %d\n", dir);
+ }
+ } else { /* TRI */
+ if ((col + row) % 2) { /* right */
+ switch (dir) {
+ case 0:
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ break;
+ case 30:
+ case 40:
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ row = (!row) ? ap->nrows - 1 : row - 1;
+ break;
+ case 60:
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ if (!row)
+ row = ap->nrows - 2;
+ else if (!(row - 1))
+ row = ap->nrows - 1;
+ else
+ row = row - 2;
+ break;
+ case 80:
+ case 90:
+ if (!row)
+ row = ap->nrows - 2;
+ else if (!(row - 1))
+ row = ap->nrows - 1;
+ else
+ row = row - 2;
+ break;
+ case 120:
+ row = (!row) ? ap->nrows - 1 : row - 1;
+ break;
+ case 150:
+ case 160:
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ row = (!row) ? ap->nrows - 1 : row - 1;
+ break;
+ case 180:
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ break;
+ case 200:
+ case 210:
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ row = (row + 1 == ap->nrows) ? 0 : row + 1;
+ break;
+ case 240:
+ row = (row + 1 == ap->nrows) ? 0 : row + 1;
+ break;
+ case 270:
+ case 280:
+ if (row + 1 == ap->nrows)
+ row = 1;
+ else if (row + 2 == ap->nrows)
+ row = 0;
+ else
+ row = row + 2;
+ break;
+ case 300:
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ if (row + 1 == ap->nrows)
+ row = 1;
+ else if (row + 2 == ap->nrows)
+ row = 0;
+ else
+ row = row + 2;
+ break;
+ case 320:
+ case 330:
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ row = (row + 1 == ap->nrows) ? 0 : row + 1;
+ break;
+ default:
+ (void) fprintf(stderr, "wrong direction %d\n", dir);
+ }
+ } else { /* left */
+ switch (dir) {
+ case 0:
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ break;
+ case 30:
+ case 40:
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ row = (row + 1 == ap->nrows) ? 0 : row + 1;
+ break;
+ case 60:
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ if (row + 1 == ap->nrows)
+ row = 1;
+ else if (row + 2 == ap->nrows)
+ row = 0;
+ else
+ row = row + 2;
+ break;
+ case 80:
+ case 90:
+ if (row + 1 == ap->nrows)
+ row = 1;
+ else if (row + 2 == ap->nrows)
+ row = 0;
+ else
+ row = row + 2;
+ break;
+ case 120:
+ row = (row + 1 == ap->nrows) ? 0 : row + 1;
+ break;
+ case 150:
+ case 160:
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ row = (row + 1 == ap->nrows) ? 0 : row + 1;
+ break;
+ case 180:
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ break;
+ case 200:
+ case 210:
+ col = (!col) ? ap->ncols - 1 : col - 1;
+ row = (!row) ? ap->nrows - 1 : row - 1;
+ break;
+ case 240:
+ row = (!row) ? ap->nrows - 1 : row - 1;
+ break;
+ case 270:
+ case 280:
+ if (!row)
+ row = ap->nrows - 2;
+ else if (row == 1)
+ row = ap->nrows - 1;
+ else
+ row = row - 2;
+ break;
+ case 300:
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ if (!row)
+ row = ap->nrows - 2;
+ else if (row == 1)
+ row = ap->nrows - 1;
+ else
+ row = row - 2;
+ break;
+ case 320:
+ case 330:
+ col = (col + 1 == ap->ncols) ? 0 : col + 1;
+ row = (!row) ? ap->nrows - 1 : row - 1;
+ break;
+ default:
+ (void) fprintf(stderr, "wrong direction %d\n", dir);
+ }
+ }
+ }
+ *pcol = col;
+ *prow = row;
+}
+
+static void
+fillcell(ModeInfo * mi, GC gc, int col, int row)
+{
+ antfarmstruct *ap = &antfarms[MI_SCREEN(mi)];
+
+ if (ap->neighbors == 6) {
+ int ccol = 2 * col + !(row & 1), crow = 2 * row;
+
+ ap->shape.hexagon[0].x = ap->xb + ccol * ap->xs;
+ ap->shape.hexagon[0].y = ap->yb + crow * ap->ys;
+ if (ap->xs == 1 && ap->ys == 1)
+ XFillRectangle(MI_DISPLAY(mi), MI_WINDOW(mi), gc,
+ ap->shape.hexagon[0].x, ap->shape.hexagon[0].y, 1, 1);
+ else
+ XFillPolygon(MI_DISPLAY(mi), MI_WINDOW(mi), gc,
+ ap->shape.hexagon, 6, Convex, CoordModePrevious);
+ } else if (ap->neighbors == 4 || ap->neighbors == 8) {
+ XFillRectangle(MI_DISPLAY(mi), MI_WINDOW(mi), gc,
+ ap->xb + ap->xs * col, ap->yb + ap->ys * row,
+ ap->xs - (ap->xs > 3), ap->ys - (ap->ys > 3));
+ } else { /* TRI */
+ int orient = (col + row) % 2; /* O left 1 right */
+
+ ap->shape.triangle[orient][0].x = ap->xb + col * ap->xs;
+ ap->shape.triangle[orient][0].y = ap->yb + row * ap->ys;
+ if (ap->xs <= 3 || ap->ys <= 3)
+ XFillRectangle(MI_DISPLAY(mi), MI_WINDOW(mi), gc,
+ ((orient) ? -1 : 1) + ap->shape.triangle[orient][0].x,
+ ap->shape.triangle[orient][0].y, 1, 1);
+ else {
+ if (orient)
+ ap->shape.triangle[orient][0].x += (ap->xs / 2 - 1);
+ else
+ ap->shape.triangle[orient][0].x -= (ap->xs / 2 - 1);
+ XFillPolygon(MI_DISPLAY(mi), MI_WINDOW(mi), gc,
+ ap->shape.triangle[orient], 3, Convex, CoordModePrevious);
+ }
+ }
+}
+
+static void
+truchetcell(ModeInfo * mi, int col, int row, int truchetstate)
+{
+ antfarmstruct *ap = &antfarms[MI_SCREEN(mi)];
+
+ if (ap->neighbors == 6) {
+
+ int ccol = 2 * col + !(row & 1), crow = 2 * row;
+ int side;
+ int fudge = 7; /* fudge because the hexagons are not exact */
+ XPoint hex, hex2;
+
+ if (ap->sharpturn) {
+ hex.x = ap->xb + ccol * ap->xs - (int) ((double) ap->xs / 2.0) - 1;
+ hex.y = ap->yb + crow * ap->ys - (int) ((double) ap->ys / 2.0) - 1;
+ for (side = 0; side < 6; side++) {
+ if (side > 0) {
+ hex.x += ap->shape.hexagon[side].x;
+ hex.y += ap->shape.hexagon[side].y;
+ }
+ if (truchetstate == side % 2)
+ XDrawArc(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
+ hex.x, hex.y, ap->xs, ap->ys,
+ ((570 - (side * 60) + fudge) % 360) * 64, (120 - 2 * fudge) * 64);
+ }
+ } else {
+
+ /* Very crude approx of Sqrt 3, so it will not cause drawing errors. */
+ hex.x = ap->xb + ccol * ap->xs - (int) ((double) ap->xs * 1.6 / 2.0);
+ hex.y = ap->yb + crow * ap->ys - (int) ((double) ap->ys * 1.6 / 2.0);
+ for (side = 0; side < 6; side++) {
+ if (side > 0) {
+ hex.x += ap->shape.hexagon[side].x;
+ hex.y += ap->shape.hexagon[side].y;
+ }
+ hex2.x = hex.x + ap->shape.hexagon[side + 1].x / 2;
+ hex2.y = hex.y + ap->shape.hexagon[side + 1].y / 2;
+ if (truchetstate == side % 3)
+ /* Crude approx of 120 deg, so it will not cause drawing errors. */
+ XDrawArc(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
+ hex2.x, hex2.y,
+ (int) ((double) ap->xs * 1.5), (int) ((double) ap->ys * 1.5),
+ ((555 - (side * 60)) % 360) * 64, 90 * 64);
+ }
+ }
+ } else if (ap->neighbors == 4) {
+ if (truchetstate) {
+ XDrawArc(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
+ ap->xb + ap->xs * col - ap->xs / 2+ 1,
+ ap->yb + ap->ys * row + ap->ys / 2 - 1,
+ ap->xs - 2, ap->ys - 2,
+ 0 * 64, 90 * 64);
+ XDrawArc(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
+ ap->xb + ap->xs * col + ap->xs / 2 - 1,
+ ap->yb + ap->ys * row - ap->ys / 2 + 1,
+ ap->xs - 2, ap->ys - 2,
+ -90 * 64, -90 * 64);
+ } else {
+ XDrawArc(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
+ ap->xb + ap->xs * col - ap->xs / 2 + 1,
+ ap->yb + ap->ys * row - ap->ys / 2 + 1,
+ ap->xs - 2, ap->ys - 2,
+ 0 * 64, -90 * 64);
+ XDrawArc(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
+ ap->xb + ap->xs * col + ap->xs / 2 - 1,
+ ap->yb + ap->ys * row + ap->ys / 2 - 1,
+ ap->xs - 2, ap->ys - 2,
+ 90 * 64, 90 * 64);
+ }
+ } else if (ap->neighbors == 3) {
+ int orient = (col + row) % 2; /* O left 1 right */
+ int side, ang;
+ int fudge = 7; /* fudge because the triangles are not exact */
+ XPoint tri;
+
+ tri.x = ap->xb + col * ap->xs;
+ tri.y = ap->yb + row * ap->ys;
+ if (orient) {
+ tri.x += (ap->xs / 2 - 1);
+ } else {
+ tri.x -= (ap->xs / 2 - 1);
+ }
+ for (side = 0; side < 3; side++) {
+ if (side > 0) {
+ tri.x += ap->shape.triangle[orient][side].x;
+ tri.y += ap->shape.triangle[orient][side].y;
+ }
+ if (truchetstate == side % 3) {
+ if (orient)
+ ang = (510 - side * 120) % 360; /* Right */
+ else
+ ang = (690 - side * 120) % 360; /* Left */
+ XDrawArc(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
+ tri.x - ap->xs / 2, tri.y - 3 * ap->ys / 4,
+ ap->xs, 3 * ap->ys / 2,
+ (ang + fudge) * 64, (60 - 2 * fudge) * 64);
+ }
+ }
+ }
+}
+
+static void
+drawcell(ModeInfo * mi, int col, int row, unsigned char color)
+{
+ antfarmstruct *ap = &antfarms[MI_SCREEN(mi)];
+ GC gc;
+
+ if (!color) {
+ XSetForeground(MI_DISPLAY(mi), MI_GC(mi), MI_BLACK_PIXEL(mi));
+ gc = MI_GC(mi);
+ } else if (MI_NPIXELS(mi) > 2) {
+ XSetForeground(MI_DISPLAY(mi), MI_GC(mi),
+ MI_PIXEL(mi, ap->colors[color - 1]));
+ gc = MI_GC(mi);
+ } else {
+ XGCValues gcv;
+
+ gcv.stipple = ap->pixmaps[color - 1];
+ gcv.foreground = MI_WHITE_PIXEL(mi);
+ gcv.background = MI_BLACK_PIXEL(mi);
+ XChangeGC(MI_DISPLAY(mi), ap->stippledGC,
+ GCStipple | GCForeground | GCBackground, &gcv);
+ gc = ap->stippledGC;
+ }
+ fillcell(mi, gc, col, row);
+}
+
+static void
+drawtruchet(ModeInfo * mi, int col, int row,
+ unsigned char color, unsigned char truchetstate)
+{
+ antfarmstruct *ap = &antfarms[MI_SCREEN(mi)];
+
+ if (!color)
+ XSetForeground(MI_DISPLAY(mi), MI_GC(mi), MI_WHITE_PIXEL(mi));
+ else if (MI_NPIXELS(mi) > 2 || color > ap->ncolors / 2)
+ XSetForeground(MI_DISPLAY(mi), MI_GC(mi), MI_BLACK_PIXEL(mi));
+ else
+ XSetForeground(MI_DISPLAY(mi), MI_GC(mi), MI_WHITE_PIXEL(mi));
+ truchetcell(mi, col, row, truchetstate);
+}
+
+static void
+draw_anant(ModeInfo * mi, int col, int row)
+{
+ XSetForeground(MI_DISPLAY(mi), MI_GC(mi), MI_WHITE_PIXEL(mi));
+ fillcell(mi, MI_GC(mi), col, row);
+#if 0 /* Can not see eyes */
+ {
+ antfarmstruct *ap = &antfarms[MI_SCREEN(mi)];
+ Display *display = MI_DISPLAY(mi);
+ Window window = MI_WINDOW(mi);
+
+ if (ap->xs > 2 && ap->ys > 2) { /* Draw Eyes */
+
+ XSetForeground(display, MI_GC(mi), MI_BLACK_PIXEL(mi));
+ switch (direction) {
+ case 0:
+ XDrawPoint(display, window, MI_GC(mi),
+ ap->xb + ap->xs - 1, ap->yb + 1);
+ XDrawPoint(display, window, MI_GC(mi),
+ ap->xb + ap->xs - 1, ap->yb + ap->ys - 2);
+ break;
+ case 180:
+ XDrawPoint(display, window, MI_GC(mi), ap->xb, ap->yb + 1);
+ XDrawPoint(display, window, MI_GC(mi), ap->xb, ap->yb + ap->ys - 2);
+ break;
+ if (neighbors == 4) {
+ case 90:
+ XDrawPoint(display, window, MI_GC(mi), ap->xb + 1, ap->yb);
+ XDrawPoint(display, window, MI_GC(mi),
+ ap->xb + ap->xs - 2, ap->yb);
+ break;
+ case 270:
+ XDrawPoint(display, window, MI_GC(mi),
+ ap->xb + 1, ap->yb + ap->ys - 1);
+ XDrawPoint(display, window, MI_GC(mi),
+ ap->xb + ap->xs - 2, ap->yb + ap->ys - 1);
+ break;
+ } /* else BEE */
+ default:
+ }
+ }
+ }
+#endif
+}
+
+#if 0
+static void
+RandomSoup(mi)
+ ModeInfo *mi;
+{
+ antfarmstruct *ap = &antfarms[MI_SCREEN(mi)];
+ int row, col, mrow = 0;
+
+ for (row = 0; row < ap->nrows; ++row) {
+ for (col = 0; col < ap->ncols; ++col) {
+ ap->old[col + mrow] = (unsigned char) NRAND((int) ap->ncolors);
+ drawcell(mi, col, row, ap->old[col + mrow]);
+ }
+ mrow += ap->nrows;
+ }
+}
+
+#endif
+
+static short
+fromTableDirection(unsigned char dir, int neighbors)
+{
+ switch (dir) {
+ case FS:
+ return 0;
+ case TRS:
+ return (ANGLES / neighbors);
+ case THRS:
+ return (ANGLES / 2 - ANGLES / neighbors);
+ case TBS:
+ return (ANGLES / 2);
+ case THLS:
+ return (ANGLES / 2 + ANGLES / neighbors);
+ case TLS:
+ return (ANGLES - ANGLES / neighbors);
+ case SF:
+ return ANGLES;
+ case STR:
+ return (ANGLES + ANGLES / neighbors);
+ case STHR:
+ return (3 * ANGLES / 2 - ANGLES / neighbors);
+ case STB:
+ return (3 * ANGLES / 2);
+ case STHL:
+ return (3 * ANGLES / 2 + ANGLES / neighbors);
+ case STL:
+ return (2 * ANGLES - ANGLES / neighbors);
+ default:
+ (void) fprintf(stderr, "wrong direction %d\n", dir);
+ }
+ return -1;
+}
+
+static void
+getTable(ModeInfo * mi, int i)
+{
+ antfarmstruct *ap = &antfarms[MI_SCREEN(mi)];
+ int j, total;
+ unsigned char *patptr;
+
+ patptr = &tables[i][0];
+ ap->ncolors = *patptr++;
+ ap->nstates = *patptr++;
+ total = ap->ncolors * ap->nstates;
+ if (MI_IS_VERBOSE(mi))
+ (void) fprintf(stdout,
+ "ants %d, neighbors %d, table number %d, colors %d, states %d\n",
+ ap->n, ap->neighbors, i, ap->ncolors, ap->nstates);
+ for (j = 0; j < total; j++) {
+ ap->machine[j].color = *patptr++;
+ if (ap->sharpturn && ap->neighbors > 4 && !(ap->neighbors % 2)) {
+ int k = *patptr++;
+
+ switch (k) {
+ case TRS:
+ k = THRS;
+ break;
+ case THRS:
+ k = TRS;
+ break;
+ case THLS:
+ k = TLS;
+ break;
+ case TLS:
+ k = THLS;
+ break;
+ case STR:
+ k = STHR;
+ break;
+ case STHR:
+ k = STR;
+ break;
+ case STHL:
+ k = STL;
+ break;
+ case STL:
+ k = STHL;
+ break;
+ default:
+ break;
+ }
+ ap->machine[j].direction = fromTableDirection(k, ap->neighbors);
+ } else {
+ ap->machine[j].direction = fromTableDirection(*patptr++, ap->neighbors);
+ }
+ ap->machine[j].next = *patptr++;
+ }
+ ap->truchet = False;
+}
+
+static void
+getTurk(ModeInfo * mi, int i)
+{
+ antfarmstruct *ap = &antfarms[MI_SCREEN(mi)];
+ int power2, j, number, total;
+
+ /* To force a number, say <i = 2;> has i + 2 (or 4) digits in binary */
+ power2 = 1 << (i + 1);
+ /* Dont want numbers which in binary are all 1's. */
+ number = NRAND(power2 - 1) + power2;
+ /* To force a particular number, say <number = 10;> */
+
+ ap->ncolors = i + 2;
+ ap->nstates = 1;
+ total = ap->ncolors * ap->nstates;
+ for (j = 0; j < total; j++) {
+ ap->machine[j].color = (j + 1) % total;
+ if (ap->sharpturn && ap->neighbors > 4 && !(ap->neighbors % 2)) {
+ ap->machine[j].direction = (power2 & number) ?
+ fromTableDirection(THRS, ap->neighbors) :
+ fromTableDirection(THLS, ap->neighbors);
+ } else {
+ ap->machine[j].direction = (power2 & number) ?
+ fromTableDirection(TRS, ap->neighbors) :
+ fromTableDirection(TLS, ap->neighbors);
+ }
+ ap->machine[j].next = 0;
+ power2 >>= 1;
+ }
+ ap->truchet = (ap->truchet && ap->xs > 2 && ap->ys > 2 &&
+ (ap->neighbors == 3 || ap->neighbors == 4 || ap->neighbors == 6));
+ if (MI_IS_VERBOSE(mi))
+ (void) fprintf(stdout,
+ "ants %d, neighbors %d, Turk's number %d, colors %d\n",
+ ap->n, ap->neighbors, number, ap->ncolors);
+}
+
+void
+init_ant(ModeInfo * mi)
+{
+ Display *display = MI_DISPLAY(mi);
+ Window window = MI_WINDOW(mi);
+ int size = MI_SIZE(mi);
+ antfarmstruct *ap;
+ int col, row, dir;
+ long i;
+
+ /* jwz sez: small sizes look like crap */
+ if (size < 0)
+ size = NRAND(-size)+1;
+ if (size < 5)
+ size += 5;
+
+ if (antfarms == NULL) {
+ if ((antfarms = (antfarmstruct *) calloc(MI_NUM_SCREENS(mi),
+ sizeof (antfarmstruct))) == NULL)
+ return;
+ }
+ ap = &antfarms[MI_SCREEN(mi)];
+ ap->redrawing = 0;
+ if (MI_NPIXELS(mi) <= 2) {
+ if (ap->stippledGC == None) {
+ XGCValues gcv;
+
+ gcv.fill_style = FillOpaqueStippled;
+ ap->stippledGC = XCreateGC(display, window, GCFillStyle, &gcv);
+ }
+ if (ap->init_bits == 0) {
+ for (i = 1; i < NUMSTIPPLES; i++)
+ ANTBITS(stipples[i], STIPPLESIZE, STIPPLESIZE);
+ }
+ }
+ ap->generation = 0;
+ ap->n = MI_COUNT(mi);
+ if (ap->n < -MINANTS) {
+ /* if ap->n is random ... the size can change */
+ if (ap->ants != NULL) {
+ (void) free((void *) ap->ants);
+ ap->ants = NULL;
+ }
+ ap->n = NRAND(-ap->n - MINANTS + 1) + MINANTS;
+ } else if (ap->n < MINANTS)
+ ap->n = MINANTS;
+
+ ap->width = MI_WIDTH(mi);
+ ap->height = MI_HEIGHT(mi);
+
+ if (neighbors == 8 || neighbors == 9 || neighbors == 12)
+ ap->neighbors = neighbors; /* Discourage but not deny use... */
+ else
+ for (i = 0; i < NEIGHBORKINDS; i++) {
+ if (neighbors == plots[i]) {
+ ap->neighbors = plots[i];
+ break;
+ }
+ if (i == NEIGHBORKINDS - 1) {
+ ap->neighbors = plots[NRAND(NEIGHBORKINDS)];
+ break;
+ }
+ }
+
+ if (ap->neighbors == 6) {
+ int nccols, ncrows;
+
+ if (ap->width < 2)
+ ap->width = 2;
+ if (ap->height < 4)
+ ap->height = 4;
+ if (size < -MINSIZE) {
+ ap->ys = NRAND(MIN(-size, MAX(MINSIZE, MIN(ap->width, ap->height) /
+ MINGRIDSIZE)) - MINSIZE + 1) + MINSIZE;
+ if (ap->ys < MINRANDOMSIZE)
+ ap->ys = MIN(MINRANDOMSIZE,
+ MAX(MINSIZE, MIN(ap->width, ap->height) / MINGRIDSIZE));
+ } else if (size < MINSIZE) {
+ if (!size)
+ ap->ys = MAX(MINSIZE, MIN(ap->width, ap->height) / MINGRIDSIZE);
+ else
+ ap->ys = MINSIZE;
+ } else
+ ap->ys = MIN(size, MAX(MINSIZE, MIN(ap->width, ap->height) /
+ MINGRIDSIZE));
+ ap->xs = ap->ys;
+ nccols = MAX(ap->width / ap->xs - 2, 2);
+ ncrows = MAX(ap->height / ap->ys - 1, 2);
+ ap->ncols = nccols / 2;
+ ap->nrows = 2 * (ncrows / 4);
+ ap->xb = (ap->width - ap->xs * nccols) / 2 + ap->xs / 2;
+ ap->yb = (ap->height - ap->ys * (ncrows / 2) * 2) / 2 + ap->ys;
+ for (i = 0; i < 6; i++) {
+ ap->shape.hexagon[i].x = (ap->xs - 1) * hexagonUnit[i].x;
+ ap->shape.hexagon[i].y = ((ap->ys - 1) * hexagonUnit[i].y / 2) * 4 / 3;
+ }
+ /* Avoid array bounds read of hexagonUnit */
+ ap->shape.hexagon[6].x = 0;
+ ap->shape.hexagon[6].y = 0;
+ } else if (ap->neighbors == 4 || ap->neighbors == 8) {
+ if (size < -MINSIZE) {
+ ap->ys = NRAND(MIN(-size, MAX(MINSIZE, MIN(ap->width, ap->height) /
+ MINGRIDSIZE)) - MINSIZE + 1) + MINSIZE;
+ if (ap->ys < MINRANDOMSIZE)
+ ap->ys = MIN(MINRANDOMSIZE,
+ MAX(MINSIZE, MIN(ap->width, ap->height) / MINGRIDSIZE));
+ } else if (size < MINSIZE) {
+ if (!size)
+ ap->ys = MAX(MINSIZE, MIN(ap->width, ap->height) / MINGRIDSIZE);
+ else
+ ap->ys = MINSIZE;
+ } else
+ ap->ys = MIN(size, MAX(MINSIZE, MIN(ap->width, ap->height) /
+ MINGRIDSIZE));
+ ap->xs = ap->ys;
+ ap->ncols = MAX(ap->width / ap->xs, 2);
+ ap->nrows = MAX(ap->height / ap->ys, 2);
+ ap->xb = (ap->width - ap->xs * ap->ncols) / 2;
+ ap->yb = (ap->height - ap->ys * ap->nrows) / 2;
+ } else { /* TRI */
+ int orient;
+
+ if (ap->width < 2)
+ ap->width = 2;
+ if (ap->height < 2)
+ ap->height = 2;
+ if (size < -MINSIZE) {
+ ap->ys = NRAND(MIN(-size, MAX(MINSIZE, MIN(ap->width, ap->height) /
+ MINGRIDSIZE)) - MINSIZE + 1) + MINSIZE;
+ if (ap->ys < MINRANDOMSIZE)
+ ap->ys = MIN(MINRANDOMSIZE,
+ MAX(MINSIZE, MIN(ap->width, ap->height) / MINGRIDSIZE));
+ } else if (size < MINSIZE) {
+ if (!size)
+ ap->ys = MAX(MINSIZE, MIN(ap->width, ap->height) / MINGRIDSIZE);
+ else
+ ap->ys = MINSIZE;
+ } else
+ ap->ys = MIN(size, MAX(MINSIZE, MIN(ap->width, ap->height) /
+ MINGRIDSIZE));
+ ap->xs = (int) (1.52 * ap->ys);
+ ap->ncols = (MAX(ap->width / ap->xs - 1, 2) / 2) * 2;
+ ap->nrows = (MAX(ap->height / ap->ys - 1, 2) / 2) * 2;
+ ap->xb = (ap->width - ap->xs * ap->ncols) / 2 + ap->xs / 2;
+ ap->yb = (ap->height - ap->ys * ap->nrows) / 2 + ap->ys;
+ for (orient = 0; orient < 2; orient++) {
+ for (i = 0; i < 3; i++) {
+ ap->shape.triangle[orient][i].x =
+ (ap->xs - 2) * triangleUnit[orient][i].x;
+ ap->shape.triangle[orient][i].y =
+ (ap->ys - 2) * triangleUnit[orient][i].y;
+ }
+ /* Avoid array bounds read of triangleUnit */
+ ap->shape.triangle[orient][3].x = 0;
+ ap->shape.triangle[orient][3].y = 0;
+ }
+ }
+
+ XSetLineAttributes(display, MI_GC(mi), 1, LineSolid, CapNotLast, JoinMiter);
+ MI_CLEARWINDOW(mi);
+ ap->painted = False;
+
+ if (MI_IS_FULLRANDOM(mi)) {
+ ap->truchet = (Bool) (LRAND() & 1);
+ ap->sharpturn = (Bool) (LRAND() & 1);
+ } else {
+ ap->truchet = truchet;
+ ap->sharpturn = sharpturn;
+ }
+ /* Exclude odd # of neighbors, stepping forward not defined */
+ if (!NRAND(NUMSTIPPLES) && ((ap->neighbors + 1) % 2)) {
+ getTable(mi, (int) (NRAND(NTABLES)));
+ } else
+ getTurk(mi, (int) (NRAND(NUMSTIPPLES - 1)));
+ if (MI_NPIXELS(mi) > 2)
+ for (i = 0; i < (int) ap->ncolors - 1; i++)
+ ap->colors[i] = (unsigned char) (NRAND(MI_NPIXELS(mi)) +
+ i * MI_NPIXELS(mi)) / ((int) (ap->ncolors - 1));
+ if (ap->ants == NULL)
+ ap->ants = (antstruct *) malloc(ap->n * sizeof (antstruct));
+ if (ap->tape != NULL)
+ (void) free((void *) ap->tape);
+ ap->tape = (unsigned char *)
+ calloc(ap->ncols * ap->nrows, sizeof (unsigned char));
+
+ if (ap->truchet_state != NULL)
+ (void) free((void *) ap->truchet_state);
+ ap->truchet_state = (unsigned char *)
+ calloc(ap->ncols * ap->nrows, sizeof (unsigned char));
+
+ col = ap->ncols / 2;
+ row = ap->nrows / 2;
+ dir = NRAND(ap->neighbors) * ANGLES / ap->neighbors;
+ /* Have them all start in the same spot, why not? */
+ for (i = 0; i < ap->n; i++) {
+ ap->ants[i].col = col;
+ ap->ants[i].row = row;
+ ap->ants[i].direction = dir;
+ ap->ants[i].state = 0;
+ }
+ draw_anant(mi, col, row);
+}
+
+void
+draw_ant(ModeInfo * mi)
+{
+ antfarmstruct *ap = &antfarms[MI_SCREEN(mi)];
+ antstruct *anant;
+ statestruct *status;
+ int i, state_pos, tape_pos;
+ unsigned char color;
+ short chg_dir, old_dir;
+
+ MI_IS_DRAWN(mi) = True;
+
+ ap->painted = True;
+ for (i = 0; i < ap->n; i++) {
+ anant = &ap->ants[i];
+ tape_pos = anant->col + anant->row * ap->ncols;
+ color = ap->tape[tape_pos]; /* read tape */
+ state_pos = color + anant->state * ap->ncolors;
+ status = &(ap->machine[state_pos]);
+ drawcell(mi, anant->col, anant->row, status->color);
+ ap->tape[tape_pos] = status->color; /* write on tape */
+
+ /* Find direction of Bees or Ants. */
+ /* Translate relative direction to actual direction */
+ old_dir = anant->direction;
+ chg_dir = (2 * ANGLES - status->direction) % ANGLES;
+ anant->direction = (chg_dir + old_dir) % ANGLES;
+ if (ap->truchet) {
+ int a = 0, b;
+
+ if (ap->neighbors == 6) {
+ if (ap->sharpturn) {
+ a = (chg_dir / 120 == 2);
+ drawtruchet(mi, anant->col, anant->row, status->color, a);
+ } else {
+ a = (old_dir / 60) % 3;
+ b = (anant->direction / 60) % 3;
+ a = (a + b + 1) % 3;
+ drawtruchet(mi, anant->col, anant->row, status->color, a);
+ }
+ } else if (ap->neighbors == 4) {
+ a = old_dir / 180;
+ b = anant->direction / 180;
+ a = ((a && !b) || (b && !a));
+ drawtruchet(mi, anant->col, anant->row, status->color, a);
+ } else if (ap->neighbors == 3) {
+ if (chg_dir == 240)
+ a = (2 + anant->direction / 120) % 3;
+ else
+ a = (1 + anant->direction / 120) % 3;
+ drawtruchet(mi, anant->col, anant->row, status->color, a);
+ }
+ ap->truchet_state[tape_pos] = a + 1;
+ }
+ anant->state = status->next;
+
+ /* If edge than wrap it */
+ old_dir = ((status->direction < ANGLES) ? anant->direction : old_dir);
+ position_of_neighbor(ap, old_dir, &(anant->col), &(anant->row));
+ draw_anant(mi, anant->col, anant->row);
+ }
+ if (++ap->generation > MI_CYCLES(mi)) {
+#ifdef STANDALONE
+ erase_full_window(MI_DISPLAY(mi), MI_WINDOW(mi));
+#endif
+ init_ant(mi);
+ }
+ if (ap->redrawing) {
+ for (i = 0; i < REDRAWSTEP; i++) {
+ if (ap->tape[ap->redrawpos] ||
+ (ap->truchet && ap->truchet_state[ap->redrawpos])) {
+ drawcell(mi, ap->redrawpos % ap->ncols, ap->redrawpos / ap->ncols,
+ ap->tape[ap->redrawpos]);
+ if (ap->truchet)
+ drawtruchet(mi, ap->redrawpos % ap->ncols, ap->redrawpos / ap->ncols,
+ ap->tape[ap->redrawpos],
+ ap->truchet_state[ap->redrawpos] - 1);
+ }
+ if (++(ap->redrawpos) >= ap->ncols * ap->nrows) {
+ ap->redrawing = 0;
+ break;
+ }
+ }
+ }
+}
+
+void
+release_ant(ModeInfo * mi)
+{
+ if (antfarms != NULL) {
+ int screen;
+
+ for (screen = 0; screen < MI_NUM_SCREENS(mi); screen++) {
+ antfarmstruct *ap = &antfarms[screen];
+ int shade;
+
+ if (ap->stippledGC != None) {
+ XFreeGC(MI_DISPLAY(mi), ap->stippledGC);
+ }
+ for (shade = 0; shade < ap->init_bits; shade++)
+ XFreePixmap(MI_DISPLAY(mi), ap->pixmaps[shade]);
+ if (ap->tape != NULL)
+ (void) free((void *) ap->tape);
+ if (ap->ants != NULL)
+ (void) free((void *) ap->ants);
+ if (ap->truchet_state != NULL)
+ (void) free((void *) ap->truchet_state);
+ }
+ (void) free((void *) antfarms);
+ antfarms = NULL;
+ }
+}
+
+void
+refresh_ant(ModeInfo * mi)
+{
+ antfarmstruct *ap = &antfarms[MI_SCREEN(mi)];
+
+ if (ap->painted) {
+ MI_CLEARWINDOW(mi);
+ ap->redrawing = 1;
+ ap->redrawpos = 0;
+ }
+}
projects / xscreensaver / blobdiff