Index: trunk/src_plugins/rbs_routing/seq.c
===================================================================
--- trunk/src_plugins/rbs_routing/seq.c	(revision 38823)
+++ trunk/src_plugins/rbs_routing/seq.c	(revision 38824)
@@ -27,28 +27,81 @@
 	rbsq->last_x = RBSR_G2R(start->x);
 	rbsq->last_y = RBSR_G2R(start->y);
 
+	rbsq->path[0].dir = GRBS_ADIR_INC;
+	rbsq->path[0].pt = start;
+	rbsq->used = 1;
+
 	return 0;
 }
 
+RND_INLINE int rbsr_seq_redraw(rbsr_seq_t *rbsq)
+{
+	grbs_t *grbs = &rbsq->map.grbs;
 
+	grbs_path_remove_2net_addrs(grbs, rbsq->tn);
+	grbs_snapshot_restore(rbsq->snap);
+}
+
 int rbsr_seq_consider(rbsr_seq_t *rbsq, rnd_coord_t tx, rnd_coord_t ty)
 {
 	grbs_point_t *end;
+	rnd_coord_t ptcx, ptcy;
+	double l1x, l1y, l2x, l2y, px, py, side, dist2, dx, dy, cop2;
+	grbs_arc_dir_t dir;
 
-		rnd_trace("consider: ");
+	end = rbsr_find_point(&rbsq->map, tx, ty);
+	if (end == NULL) {
+		int need_redraw = 0;
+		if (rbsq->consider.dir != RBS_ADIR_invalid)
+			need_redraw = 1;
 
-	end = rbsr_find_point(&rbsq->map, tx, ty);
-	if (end != NULL) {
-		rnd_trace("found pt\n");
+		rbsq->consider.dir = RBS_ADIR_invalid;
+		if (need_redraw)
+			rbsr_seq_redraw(rbsq);
+		return -1;
 	}
-	else
-		rnd_trace("nope\n");
 
-	return -1;
+	ptcx = RBSR_G2R(end->x);
+	ptcy = RBSR_G2R(end->y);
+
+	cop2 = RBSR_G2R(end->copper);
+	cop2 = cop2 * cop2;
+
+	dx = tx - ptcx; dy = ty - ptcy;
+	dist2 = dx*dx + dy*dy;
+
+	if (dist2 > cop2) {
+		/* project target point onto the line between last end and center of the
+		   point; if it is to the right, go ccw, if to the left go cw, if in the
+		   center go incident */
+		/* decide direction from cross product; line is rbsq->last_* -> ptc* */
+		l1x = rbsq->last_x; l1y = rbsq->last_y;
+		l2x = ptcx, l2y = ptcy;
+		px = tx; py = ty;
+
+		side = (l2x - l1x) * (py - l1y) - (l2y - l1y) * (px - l1x);
+		rnd_trace(" side: %f %s\n", side, (side < 0) ? "cw" : "ccw");
+		dir = (side < 0) ? GRBS_ADIR_CONVEX_CW : GRBS_ADIR_CONVEX_CCW;
+	}
+	else {
+		rnd_trace(" incident\n");
+		dir = GRBS_ADIR_INC;
+	}
+
+	if ((rbsq->consider.pt == end) && (rbsq->consider.dir == dir))
+		return 0; /* do not redraw if there's no change */
+
+	rbsq->consider.pt = end;
+	rbsq->consider.dir = dir;
+
+	return rbsr_seq_redraw(rbsq);
 }
 
-int rbsr_seq_accept(rbsr_seq_t *rbss)
+int rbsr_seq_accept(rbsr_seq_t *rbsq)
 {
-	return -1;
+	rbsq->path[rbsq->used] = rbsq->consider;
+	rbsq->used++;
+TODO("update last_x and last_y");
+	return 0;
 }
 
Index: trunk/src_plugins/rbs_routing/seq.h
===================================================================
--- trunk/src_plugins/rbs_routing/seq.h	(revision 38823)
+++ trunk/src_plugins/rbs_routing/seq.h	(revision 38824)
@@ -7,14 +7,20 @@
 #include <libgrbs/snapshot.h>
 
 #define RBSR_SEQ_MAX 256
+#define RBS_ADIR_invalid -42
 
+typedef struct rbsr_seq_addr_s {
+	grbs_point_t *pt;
+	grbs_arc_dir_t dir;
+} rbsr_seq_addr_t;
+
 typedef struct rbsr_seq_s {
 	rbsr_map_t map;
 	grbs_2net_t *tn;
 
-	grbs_addr_t path[RBSR_SEQ_MAX];
+	rbsr_seq_addr_t consider; /* next point to route to, before click; valid if .adir != RBS_ADIR_invalid */
+	rbsr_seq_addr_t path[RBSR_SEQ_MAX];
 	long used; /* number of path items already accepted */
-	grbs_addr_t consider;
 
 	rnd_coord_t last_x, last_y; /* last point coords on the path for the tool code */