diff --git a/qad/blockview/blockbusitem.cpp b/qad/blockview/blockbusitem.cpp
index 8e56fbe..0091bb1 100644
--- a/qad/blockview/blockbusitem.cpp
+++ b/qad/blockview/blockbusitem.cpp
@@ -350,8 +350,10 @@ void BlockBusItem::updateGeometry() {
 }
 
 
-void BlockBusItem::checkDelete() {
-	if (pol.size() < 2 || segments.size() < 1) deleteLater();
+bool BlockBusItem::checkDelete() {
+	if (pol.size() >= 2 && segments.size() >= 1) return false;
+	deleteLater();
+	return true;
 }
 
 
@@ -551,13 +553,13 @@ void BlockBusItem::mousePressEvent(QGraphicsSceneMouseEvent * e) {
 			if (selPoint >= 0 && selPoint <= pol.size() - 1) {
 				removePoint(selPoint);
 				simplify();
-				emitAction(BlockItemBase::BusPointRemove);
+				if (!checkDelete()) emitAction(BlockItemBase::BusPointRemove);
 				return;
 			}
 			if (selSegment >= 0 && selSegment <= segments.size() - 1) {
 				removeSegment(selSegment);
 				simplify();
-				emitAction(BlockItemBase::BusSegmentRemove);
+				if (!checkDelete()) emitAction(BlockItemBase::BusSegmentRemove);
 				return;
 			}
 		}
diff --git a/qad/blockview/blockbusitem.h b/qad/blockview/blockbusitem.h
index c680ef4..f866547 100644
--- a/qad/blockview/blockbusitem.h
+++ b/qad/blockview/blockbusitem.h
@@ -72,7 +72,7 @@ protected:
 	void _init();
 	void reconnect();
 	void updateGeometry();
-	void checkDelete();
+	bool checkDelete();
 	void emitAction(BlockItemBase::Action a);
 	QVector<int> endpoints() const;
 	QVector<int> endpointLine(int ep, double angle) const;
diff --git a/qad/blockview/blockview.cpp b/qad/blockview/blockview.cpp
index 006ac40..4f89b35 100644
--- a/qad/blockview/blockview.cpp
+++ b/qad/blockview/blockview.cpp
@@ -27,6 +27,22 @@ BlockView::~BlockView() {
 
 
 void BlockView::_init() {
+	grid_visible = grid_snap = pm_connect = navigation = m_connect = m_trace_with_buses = minimap = true;
+	mm_drag = moved = new_branch = new_bus = mm_cancel = iconnect = mm_copy = m_pin_mc = mm_thumb = false;
+	match_bus = bus_from = 0;
+	mm_ci = 0;
+	hpin = 0;
+	grid_step = 10.;
+	grid_points = 1;
+	grid_pen = QPen(Qt::lightGray, 1, Qt::NoPen);
+	thick = 1;
+	thumb_hide_delay = 500;
+	timer_thumb = 0;
+	smode = BlockView::MultiSelection;
+	cur_scl = thumb_scl = 1.;
+	_talpha = 0.;
+	ae_enabled = is_nav_anim = true;
+	thumb_size = QSizeF(200, 200);
 	if (scene() == 0) {
 		scene_ = new QGraphicsScene;
 		setScene(scene_);
@@ -46,6 +62,10 @@ void BlockView::_init() {
 	thumb_anim.setTargetObject(this);
 	thumb_anim.setPropertyName("_thumb");
 	thumb_anim.setEasingCurve(QEasingCurve::InCubic);
+	nav_anim.setTargetObject(this);
+	nav_anim.setPropertyName("_nav");
+	nav_anim.setEasingCurve(QEasingCurve::InQuad);
+	nav_anim.setDuration(200);
 	connect(scene_, SIGNAL(sceneRectChanged(QRectF)), this, SLOT(adjustThumb()));
 	connect(scene_, SIGNAL(selectionChanged()), this, SLOT(sceneSelectionChanged()));
 	centerOn(scene_->sceneRect().center());
@@ -55,21 +75,6 @@ void BlockView::_init() {
 	setRenderHint(QPainter::Antialiasing);
 	setRenderHint(QPainter::SmoothPixmapTransform);
 	setMouseTracking(true);
-	grid_visible = grid_snap = pm_connect = navigation = m_connect = m_trace_with_buses = minimap = true;
-	mm_drag = moved = new_branch = new_bus = mm_cancel = iconnect = mm_copy = m_pin_mc = mm_thumb = false;
-	match_bus = bus_from = 0;
-	mm_ci = 0;
-	timer_thumb = 0;
-	hpin = 0;
-	grid_step = 10.;
-	grid_points = 1;
-	grid_pen = QPen(Qt::lightGray, 1, Qt::NoPen);
-	thumb_hide_delay = 500;
-	smode = BlockView::MultiSelection;
-	cur_scl = thumb_scl = 1.;
-	_talpha = 0.;
-	ae_enabled = true;
-	thumb_size = QSizeF(200, 200);
 	sel_rect.setZValue(999.);
 	sel_rect.hide();
 	QColor sc = palette().color(QPalette::Highlight);
@@ -590,14 +595,21 @@ void BlockView::timerEvent(QTimerEvent * e) {
 }
 
 
-void BlockView::wheelEvent(QWheelEvent * event) {
+void BlockView::wheelEvent(QWheelEvent * e) {
 	if (!navigation) return;
-	if (event->modifiers().testFlag(Qt::ControlModifier)) {
-		double scl = 1. + event->delta() / 500.;
-		scale(scl, scl);
+	if (e->modifiers().testFlag(Qt::ControlModifier)) {
+		double scl = 1. - e->delta() / 500.;
+		//scale(scl, scl);
+		QRectF r = nav_target;
+		double cx = double(e->pos().x()) / viewport()->width(), cy = double(e->pos().y()) / viewport()->height();
+		double pw = r.width(), ph = r.height();
+		r.setWidth(r.width() * scl);
+		r.setHeight(r.height() * scl);
+		r.translate(cx * (pw - r.width()), cy * (ph - r.height()));
+		animateNav(r);
 		return;
 	}
-	QGraphicsView::wheelEvent(event);
+	QGraphicsView::wheelEvent(e);
 }
 
 
@@ -614,6 +626,7 @@ void BlockView::mouseMoveEvent(QMouseEvent * event) {
 			horizontalScrollBar()->setValue(horizontalScrollBar()->value() + dp.x());
 			verticalScrollBar()->setValue(verticalScrollBar()->value() + dp.y());
 			press_point = event->pos();
+			nav_target = _nav();
 			return;
 		}
 	}
@@ -639,7 +652,9 @@ void BlockView::keyPressEvent(QKeyEvent * e) {
 
 void BlockView::resizeEvent(QResizeEvent * event) {
 	QGraphicsView::resizeEvent(event);
+	thick = qMax<int>(qRound(fontMetrics().size(0, "0").height() / 15.), 1);
 	adjustThumb();
+	nav_target = _nav();
 }
 
 
@@ -648,7 +663,7 @@ void BlockView::scrollContentsBy(int dx, int dy) {
 	if (isHidden()) return;
 	thumbShow();
 	restartTimer(timer_thumb, thumb_hide_delay);
-	QMetaObject::invokeMethod(&widget_thumb, "repaint", Qt::QueuedConnection);
+	QMetaObject::invokeMethod(&widget_thumb, "update", Qt::QueuedConnection);
 }
 
 
@@ -668,7 +683,7 @@ void BlockView::drawBackground(QPainter * painter, const QRectF & rect) {
 	ry = quantize(rect.top(), sy);
 	bool gp = grid_points > 0.5;
 	if (gp) {
-		QPen pp(grid_pen.color(), grid_points, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
+		QPen pp(grid_pen.color(), qMax<int>(grid_points, thick), Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
 		pp.setCosmetic(true);
 		painter->setPen(pp);
 		for(int i = 0; i < qCeil(rect.width() / sx) + 1; ++i)
@@ -676,6 +691,8 @@ void BlockView::drawBackground(QPainter * painter, const QRectF & rect) {
 				painter->drawPoint(rx + i * sx, ry + j * sy);
 	}
 	if (grid_pen.style() == Qt::NoPen) return;
+	QPen pen = grid_pen;
+	pen.setWidth(qMax<int>(pen.width(), thick));
 	painter->setPen(grid_pen);
 	for(int i = 0; i < qCeil(rect.width() / sx) + 1; ++i) {
 		double cx = rx + i * sx;
@@ -1330,6 +1347,23 @@ QList<QGraphicsItem * > BlockView::selectedDecors() const {
 }
 
 
+QRectF BlockView::_nav() const {
+	return mapToScene(viewport()->rect()).boundingRect();
+}
+
+
+void BlockView::animateNav(QRectF d) {
+	nav_target = d;
+	if (is_nav_anim) {
+		nav_anim.stop();
+		nav_anim.setStartValue(_nav());
+		nav_anim.setEndValue(d);
+		nav_anim.start();
+	} else
+		_setNav(d);
+}
+
+
 void BlockView::adjustThumb() {
 	if (!scene()) return;
 	QSizeF sr = sceneRect().size(), tr;
@@ -1462,6 +1496,11 @@ void BlockView::_setThumb(double v) {
 }
 
 
+void BlockView::_setNav(QRectF v) {
+	fitInView(v);
+}
+
+
 void BlockView::reconnectAll() {
 	//qDebug() << "reconnect";
 	removeJunk();
@@ -1505,7 +1544,16 @@ void BlockView::reconnectAll() {
 
 
 void BlockView::zoom(double factor) {
-	scale(factor, factor);
+	QRectF r = nav_target;
+	QPoint mp;
+	if (underMouse()) mp = mapFromGlobal(QCursor::pos());
+	else mp = QPoint(viewport()->width() / 2, viewport()->height() / 2);
+	double cx = double(mp.x()) / viewport()->width(), cy = double(mp.y()) / viewport()->height();
+	double pw = r.width(), ph = r.height();
+	r.setWidth(r.width() / factor);
+	r.setHeight(r.height() / factor);
+	r.translate(cx * (pw - r.width()), cy * (ph - r.height()));
+	animateNav(r);
 }
 
 
diff --git a/qad/blockview/blockview.h b/qad/blockview/blockview.h
index 8d80d0d..2f5f996 100644
--- a/qad/blockview/blockview.h
+++ b/qad/blockview/blockview.h
@@ -30,11 +30,13 @@ class BlockView: public QGraphicsView
 	Q_PROPERTY(bool postMoveConnect READ isPostMoveConnectEnabled WRITE setPostMoveConnectEnabled)
 	Q_PROPERTY(bool connectByMouse READ isConnectByMouseEnabled WRITE setConnectByMouseEnabled)
 	Q_PROPERTY(bool navigationEnabled READ isNavigationEnabled WRITE setNavigationEnabled)
+	Q_PROPERTY(bool navigateAnimationEnabled READ isNavigateAnimationEnabled WRITE setNavigateAnimationEnabled)
 	Q_PROPERTY(bool traceConsiderBuses READ isTraceConsiderBuses WRITE setTraceConsiderBuses)
 	Q_PROPERTY(bool pinMulticonnect READ isPinMulticonnectEnabled WRITE setPinMulticonnectEnabled)
 	Q_PROPERTY(bool miniMap READ isMiniMapEnabled WRITE setMiniMapEnabled)
 	
 	Q_PROPERTY(double _thumb READ _thumb WRITE _setThumb DESIGNABLE false SCRIPTABLE false)
+	Q_PROPERTY(QRectF _nav READ _nav WRITE _setNav DESIGNABLE false SCRIPTABLE false)
 
 public:
 	BlockView(QWidget * parent = 0);
@@ -52,6 +54,7 @@ public:
 	bool isSnapToGrid() const {return grid_snap;}
 	bool isPostMoveConnectEnabled() const {return pm_connect;}
 	bool isNavigationEnabled() const {return navigation;}
+	bool isNavigateAnimationEnabled() const {return is_nav_anim;}
 	bool isConnectByMouseEnabled() const {return m_connect;}
 	bool isTraceConsiderBuses() const {return m_trace_with_buses;}
 	bool isPinMulticonnectEnabled() const {return m_pin_mc;}
@@ -77,7 +80,7 @@ protected:
 	void stopTimer(int & tid);
 	void restartTimer(int & tid, int msecs);
 	void timerEvent(QTimerEvent * e);
-	void wheelEvent(QWheelEvent * event);
+	void wheelEvent(QWheelEvent * e);
 	void mousePressEvent(QMouseEvent * event);
 	void mouseMoveEvent(QMouseEvent * event);
 	void keyPressEvent(QKeyEvent * event);
@@ -108,6 +111,8 @@ protected:
 	QList<BlockItem * > selectedBlocks() const;
 	QList<QGraphicsItem * > selectedDecors() const;
 	double _thumb() const {return _talpha;}
+	QRectF _nav() const;
+	void animateNav(QRectF d);
 	void scrollFromThumb();
 	void deleteCopyTemp();
 	void emitActionEvent(BlockItemBase::Action action, QList<QGraphicsItem * > items);
@@ -129,15 +134,16 @@ protected:
 	QPoint press_point, screen_point, thumb_press;
 	QPointF scene_point, trace_from, last_trace_from, trace_to, copy_dp;
 	QRect thumb_sr, thumb_vr;
+	QRectF nav_target;
 	QSizeF thumb_size;
 	QPen grid_pen;
 	SelectionMode smode;
 	QImage im_scene;
 	QWidget widget_thumb;
 	Qt::KeyboardModifiers mm_mods;
-	QPropertyAnimation thumb_anim;
-	int timer_thumb, thumb_hide_delay;
-	bool mm_drag, new_bus, new_branch, moved, mm_cancel, iconnect, mm_copy, mm_thumb, ae_enabled;
+	QPropertyAnimation thumb_anim, nav_anim;
+	int timer_thumb, thumb_hide_delay, thick;
+	bool mm_drag, new_bus, new_branch, moved, mm_cancel, iconnect, mm_copy, mm_thumb, ae_enabled, is_nav_anim;
 	bool grid_visible, grid_snap, pm_connect, navigation, m_connect, m_trace_with_buses, m_pin_mc, minimap;
 	double grid_step, grid_points, cur_scl, _talpha, thumb_scl;
 
@@ -153,6 +159,7 @@ protected slots:
 	void removeJunk();
 	void sceneSelectionChanged();
 	void _setThumb(double v);
+	void _setNav(QRectF v);
 
 public slots:
 	void setGridPen(const QPen & pen) {grid_pen = pen; _updateBack();}
@@ -162,6 +169,7 @@ public slots:
 	void setGridPointsWidth(double width_) {grid_points = width_; _updateBack();}
 	void setPostMoveConnectEnabled(bool on) {pm_connect = on;}
 	void setNavigationEnabled(bool on) {navigation = on;}
+	void setNavigateAnimationEnabled(bool on) {is_nav_anim = on;}
 	void setConnectByMouseEnabled(bool on) {m_connect = on;}
 	void setTraceConsiderBuses(bool on) {m_trace_with_buses = on;}
 	void setPinMulticonnectEnabled(bool on) {m_pin_mc = on;}