--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rotate.c	Sat Dec 06 05:41:29 1997 +0000
@@ -0,0 +1,130 @@
+/* $Id: rotate.c,v 1.1.1.1 1997/12/06 05:41:30 darius Exp $ */
+
+/*
+ * rotate.c
+ *
+ */
+#include "copyright2.h"
+
+#include <stdio.h>
+#include <sys/types.h>
+#ifndef AMIGA			/* not that this file needs any network
+				   stuff... -JR */
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <netdb.h>
+#endif
+#include <math.h>
+#include <errno.h>
+#include "Wlib.h"
+#include "defs.h"
+#include "struct.h"
+#include "data.h"
+#include "packets.h"
+
+#ifdef ROTATERACE
+
+void
+rotate_dir(d, r)
+    unsigned char *d;
+    int     r;
+{
+    (*d) += r;
+}
+
+/* general rotation */
+
+void
+rotate_coord(x, y, d, cx, cy)
+    int    *x, *y;		/* values used and returned */
+    int     d;			/* degree (pi == 128) */
+    int     cx, cy;		/* around center point */
+{
+    register
+    int     ox, oy;
+
+    ox = *x;
+    oy = *y;
+
+    switch (d) {
+
+    case 0:
+	return;
+
+    case 64:
+    case -192:
+	*x = cy - oy + cx;
+	*y = ox - cx + cy;
+	break;
+
+    case 128:
+    case -128:
+	*x = cx - ox + cx;
+	*y = cy - oy + cy;
+	break;
+
+    case 192:
+    case -64:
+	*x = oy - cy + cx;
+	*y = cx - ox + cy;
+	break;
+
+    default:{
+	    /* do it the hard way */
+	    /*
+	       there is another way to do this, by using the cos(d) and
+	       sin(d) and the stock rotation matrix from linear algebra.
+	    */
+	    double  dir;
+	    double  r, dx, dy;
+	    double  rd = (double) d * 3.1415927 / 128.;
+
+	    if (*x != cx || *y != cy) {
+		dx = (double) (*x - cx);
+		dy = (double) (cy - *y);
+		dir = atan2(dx, dy) - 3.1415927 / 2.;
+		r = hypot(dx, dy);
+		dir += rd;
+		*x = (int) (r * cos(dir) + cx);
+		*y = (int) (r * sin(dir) + cy);
+	    }
+	}
+    }
+}
+
+void
+rotate_gcenter(x, y)
+    int    *x, *y;		/* values used and returned */
+{
+    rotate_coord(x, y, rotate_deg, blk_gwidth / 2, blk_gwidth / 2);
+}
+
+#endif
+
+void rotate_all()
+{
+    register i;
+    register struct planet *l;
+    register struct player *j;
+
+    int     nplan = (paradise) ? nplanets : 40;
+    int     old_rotate_deg = rotate_deg;
+
+    redrawall = 1;
+    reinitPlanets = 1;
+
+    rotate_deg = -old_rotate_deg + rotate * 64;
+
+    for (i = 0, l = planets; i < nplan; i++, l++) {
+	rotate_gcenter(&l->pl_x, &l->pl_y);
+    }
+
+    for (i=0, j = players; i < nplayers; i++, j++) {
+	rotate_gcenter(&j->p_x, &j->p_y);
+	rotate_dir(&j->p_dir, rotate_deg);
+    }
+
+    rotate_deg = rotate * 64;
+}