diff --git a/qad/blockview/blockview.cpp b/qad/blockview/blockview.cpp
index 418c5f7..db628a0 100644
--- a/qad/blockview/blockview.cpp
+++ b/qad/blockview/blockview.cpp
@@ -1264,14 +1264,17 @@ void BlockView::trace(QPointF scene_pos_from, QPointF scene_pos_to, BlockBusItem
 					double signx = (p1.x() >= p0.x() ? 1. : -1.), signy = (p1.y() >= p0.y() ? 1. : -1.);
 					int steps(0);
 					if ((dx + dy) < grid_step) continue;
+					BlockViewWavetrace::CellState cs = BlockViewWavetrace::Blocked;
 					if (dx >= dy) { // by x
 						sx = grid_step;
 						sy = sx * dy / dx;
 						steps = qRound(dx / grid_step);
+						cs = BlockViewWavetrace::HorizontalBus;
 					} else {
 						sy = grid_step;
 						sx = sy * dx / dy;
 						steps = qRound(dy / grid_step);
+						cs = BlockViewWavetrace::VerticalBus;
 					}
 					sx *= signx;
 					sy *= signy;
@@ -1279,7 +1282,7 @@ void BlockView::trace(QPointF scene_pos_from, QPointF scene_pos_to, BlockBusItem
 					for (int j = 0; j < steps; ++j) {
 						QPoint tp = quantize(cp, grid_step).toPoint() / grid_step + dp;
 						if (tp != qpt)
-							wavetrace.fill(tp, BlockViewWavetrace::Jump);
+							wavetrace.fill(tp, cs);
 						//qDebug() << " set" << cp;
 						cp += QPointF(sx, sy);
 					}
diff --git a/qad/blockview/blockviewwavetrace.cpp b/qad/blockview/blockviewwavetrace.cpp
index 72b597c..79be7fd 100644
--- a/qad/blockview/blockviewwavetrace.cpp
+++ b/qad/blockview/blockviewwavetrace.cpp
@@ -1,5 +1,4 @@
 #include "blockviewwavetrace.h"
-#include <QTime>
 
 
 BlockViewWavetrace::BlockViewWavetrace(int width, int height) {
@@ -17,14 +16,13 @@ void BlockViewWavetrace::resize(int width, int height) {
 	for (int i = 0; i < wid; ++i) {
 		if (field[i].size() != hei) {
 			field[i].resize(hei);
-			field[i].fill(-1);
+			field[i].fill(Cell());
 		}
 	}
 }
 
 
 void BlockViewWavetrace::fill(short val) {
-	QTime tm; tm.restart();
 	for (int i = 0; i < wid; ++i) {
 		if (i == 0)
 			field[i].fill(val);
@@ -37,11 +35,18 @@ void BlockViewWavetrace::fill(short val) {
 void BlockViewWavetrace::fill(const QRect & rect, short val) {
 	for (int i = rect.left(); i <= rect.right(); ++i)
 		for (int j = rect.top(); j <= rect.bottom(); ++j)
-			field[i][j] = val;
+			field[i][j].value = field[i][j].direction = val;
 }
 
+
 void BlockViewWavetrace::fill(int px, int py, short val) {
-	field[px][py] = val;
+	short p = field[px][py].value;
+	if ((val == HorizontalBus && p == VerticalBus  ) ||
+		(val == VerticalBus   && p == HorizontalBus))
+		field[px][py].value = Blocked;
+	else
+		field[px][py].value = val;
+	field[px][py].direction = field[px][py].value;
 }
 
 
@@ -51,44 +56,33 @@ bool BlockViewWavetrace::trace(const QPoint & start, const QPoint & finish) {
 	if (dir_ == NoTrace) return true;
 	//qDebug() << "trace" << start << finish;
 	//return true;
-	int cx, cy;
 	short cl = 0;
 	QRect frect(0, 0, wid - 1, hei - 1);
 	QVector<QPoint> cpnts, npnts;
 	fill(st, cl);
-	jumps.clear();
-	cpnts.append(st);
-	auto checkAndFill = [this, &npnts, &frect](int x, int y, short c) {
+	cpnts.push_back(st);
+	if (field[fn.x()][fn.y()].value == (short)Blocked)
+		return false;
+	auto checkAndFill = [this, &npnts, &frect](int x, int y, short acc_dir, short c) {
 		if (!frect.contains(x, y)) return;
-		short p = field[x][y];
-		if (p == (short)Empty || p == (short)Jump) {
-			npnts.append(QPoint(x, y));
-			fill(x, y, c);
-		}
-		if (p == (short)Jump) {
-			jumps.append(QPoint(x, y));
+		short p = field[x][y].value;
+		if (p == (short)Empty || p == acc_dir) {
+			npnts.push_back(QPoint(x, y));
+			field[x][y].value = c;
 		}
 	};
-	if (field[fn.x()][fn.y()] < (short)Empty)
-		return false;
 	while (cpnts.size() > 0) {
 		npnts.clear();
 		cl++;
-		if (cl >= max_steps) return false;
+		if (cl >= max_steps)
+			return false;
 		for (int i = 0; i < cpnts.size(); ++i) {
-			if (cpnts[i] == fn) {
+			if (cpnts[i] == fn)
 				return true;
-			}
-			cx = cpnts[i].x() - 1;
-			cy = cpnts[i].y();
-			checkAndFill(cx, cy, cl);
-			cx = cpnts[i].x() + 1;
-			checkAndFill(cx, cy, cl);
-			cx = cpnts[i].x();
-			cy = cpnts[i].y() - 1;
-			checkAndFill(cx, cy, cl);
-			cy = cpnts[i].y() + 1;
-			checkAndFill(cx, cy, cl);
+			checkAndFill(cpnts[i].x() - 1, cpnts[i].y()    , (short)VerticalBus  , cl);
+			checkAndFill(cpnts[i].x() + 1, cpnts[i].y()    , (short)VerticalBus  , cl);
+			checkAndFill(cpnts[i].x()    , cpnts[i].y() - 1, (short)HorizontalBus, cl);
+			checkAndFill(cpnts[i].x()    , cpnts[i].y() + 1, (short)HorizontalBus, cl);
 		}
 		cpnts = npnts;
 		//qDebug() << cl << ": " << cpnts.size();
@@ -106,27 +100,21 @@ void BlockViewWavetrace::gatherPath() {
 	}
 	int pa = -1, ca = -1;
 	bool first = true;
-	short cl = field[fn.x()][fn.y()];
+	short cl = field[fn.x()][fn.y()].value;
 	QRect frect(0, 0, wid, hei);
 	QPoint cpnt = fn;
 	//cout << "start from " << cl << endl;
-	auto checkAndStep = [this, &cpnt, &first, &frect] (int & dir, short c, int & ca_, int pa_)->bool {
+	auto checkAndStep = [this, &cpnt, &first, &frect] (int dir, short c, int & ca_, int pa_)->bool {
 		int cx = cpnt.x() + dps[dir].x();
 		int cy = cpnt.y() + dps[dir].y();
-		dir++;
 		if (frect.contains(cx, cy)) {
-			if (field[cx][cy] == c) {
-				if (jumps.contains(QPoint(cx, cy))) {
-					int jx = cx - 1;
-					int jy = cy;
-					if (jumps.contains(QPoint(jx, jy))) fill(jx, jy, (short)Jump);
-					jx = cx + 1;
-					if (jumps.contains(QPoint(jx, jy))) fill(jx, jy, (short)Jump);
-					jx = cx;
-					jy = cy - 1;
-					if (jumps.contains(QPoint(jx, jy))) fill(jx, jy, (short)Jump);
-					jy = cy + 1;
-					if (jumps.contains(QPoint(jx, jy))) fill(jx, jy, (short)Jump);
+			const Cell & cell(field[cx][cy]);
+			if (cell.value == c) {
+				if (cell.direction == HorizontalBus || cell.direction == VerticalBus) {
+					if (dps[dir].x() == 0 && cell.direction == VerticalBus)
+						return false;
+					if (dps[dir].y() == 0 && cell.direction == HorizontalBus)
+						return false;
 				}
 				ca_ = QLineF(QPointF(cx, cy), cpnt).angle();
 				if (ca_ != pa_ && !first)
@@ -141,11 +129,12 @@ void BlockViewWavetrace::gatherPath() {
 	while (cl > 0) {
 		cl--;
 		pa = ca;
-		int dir = 0;
-		if (checkAndStep(dir, cl, ca, pa)) continue;
-		if (checkAndStep(dir, cl, ca, pa)) continue;
-		if (checkAndStep(dir, cl, ca, pa)) continue;
-		if (checkAndStep(dir, cl, ca, pa)) continue;
+
+		if (checkAndStep(0, cl, ca, pa)) continue;
+		if (checkAndStep(1, cl, ca, pa)) continue;
+		if (checkAndStep(2, cl, ca, pa)) continue;
+		if (checkAndStep(3, cl, ca, pa)) continue;
+
 	}
 	path_.push_front(st);
 	//cout << path_.size() << endl;
@@ -154,13 +143,13 @@ void BlockViewWavetrace::gatherPath() {
 
 void BlockViewWavetrace::setPreferredDirection(BlockViewWavetrace::Direction dir) {
 	dir_ = dir;
-	if (dir == Horizontal) {
+	if (dir == BlockViewWavetrace::Horizontal) {
 		dps[0] = QPoint(0, -1);
 		dps[1] = QPoint(0, 1);
 		dps[2] = QPoint(-1, 0);
 		dps[3] = QPoint(1, 0);
 	}
-	if (dir == Vertical) {
+	if (dir == BlockViewWavetrace::Vertical) {
 		dps[2] = QPoint(0, -1);
 		dps[3] = QPoint(0, 1);
 		dps[0] = QPoint(-1, 0);
diff --git a/qad/blockview/blockviewwavetrace.h b/qad/blockview/blockviewwavetrace.h
index f95a8c7..c8d0f90 100644
--- a/qad/blockview/blockviewwavetrace.h
+++ b/qad/blockview/blockviewwavetrace.h
@@ -27,7 +27,7 @@ class QAD_EXPORT BlockViewWavetrace {
 public:
 	BlockViewWavetrace(int width = 1, int height = 1);
 	
-	enum CellState {Empty = -1, Blocked = -2, Jump = -3};
+	enum CellState {Empty = -1, Blocked = -2, HorizontalBus = -3, VerticalBus = -4};
 	enum Direction {NoTrace, Horizontal, Vertical};
 	
 	int width() const {return wid;}
@@ -36,7 +36,7 @@ public:
 	void resize(const QSize & sz) {resize(sz.width(), sz.height());}
 	void fill(short val = -1);
 	void fill(const QRect & rect, short val = -1);
-	void fill(const QPoint & point, short val = -1) {field[point.x()][point.y()] = val;}
+	void fill(const QPoint & point, short val = -1) {fill(point.x(), point.y(), val);}
 	void fill(int px, int py, short val);
 	void fill(BlockViewWavetrace::CellState val = Empty) {fill((short)val);}
 	void fill(const QRect & rect, BlockViewWavetrace::CellState val = Empty) {fill(rect, (short)val);}
@@ -52,9 +52,15 @@ public:
 	const QVector<QPoint> & path() const;
 
 private:
+	struct Cell {
+		Cell(short v = Empty): value(v), direction(0) {}
+		short value;
+		short direction;
+	};
+
 	int wid, hei, max_steps;
 	Direction dir_;
-	QVector<QVector<short> > field;
+	QVector<QVector<Cell> > field;
 	QVector<QPoint> path_;
 	QVector<QPoint> jumps;
 	QPoint dps[4], st, fn;