New symbol part list control that shows previews and has a built in editor

src/data/action/symbol.cpp

@@ -18,13 +18,17 @@ DECLARE_TYPEOF_COLLECTION(ControlPointP);
 // ----------------------------------------------------------------------------- : Utility
 
 String action_name_for(const set<SymbolPartP>& parts, const String& action) {
-	return format_string(action, parts.size() == 1 ? _TYPE_("shape") : _TYPE_("shapes"));
+	return format_string(action, parts.size() == 1 ? (*parts.begin())->name : _TYPE_("shapes"));
 }
 
+SymbolPartsAction::SymbolPartsAction(const set<SymbolPartP>& parts)
+	: parts(parts)
+{}
+
 // ----------------------------------------------------------------------------- : Moving symbol parts
 
 SymbolPartMoveAction::SymbolPartMoveAction(const set<SymbolPartP>& parts, const Vector2D& delta)
-	: parts(parts)
+	: SymbolPartsAction(parts)
 	, delta(delta), moved(-delta)
 	, min_pos(Vector2D::infinity()), max_pos(-Vector2D::infinity())
 	, constrain(false)
@@ -32,10 +36,8 @@ SymbolPartMoveAction::SymbolPartMoveAction(const set<SymbolPartP>& parts, const
 {
 	// Determine min/max_pos
 	FOR_EACH(p, parts) {
-		if (SymbolShape* s = p->isSymbolShape()) {
-			min_pos = piecewise_min(min_pos, s->min_pos);
-			max_pos = piecewise_max(max_pos, s->max_pos);
-		}
+		min_pos = piecewise_min(min_pos, p->min_pos);
+		max_pos = piecewise_max(max_pos, p->max_pos);
 	}
 }
 
@@ -46,20 +48,28 @@ String SymbolPartMoveAction::getName(bool to_undo) const {
 void SymbolPartMoveAction::perform(bool to_undo) {
 	// move the points back
 	FOR_EACH(p, parts) {
-		if (SymbolShape* s = p->isSymbolShape()) {
-			s->min_pos -= moved;
-			s->max_pos -= moved;
-			FOR_EACH(pnt, s->points) {
-				pnt->pos -= moved;
-			}
-		} else if (SymbolSymmetry* s = p->isSymbolSymmetry()) {
-			s->center -= moved;
-		} else {
-			throw InternalError(_("Invalid symbol part type"));
-		}
+		movePart(*p);
 	}
 	moved = -moved;
 }
+void SymbolPartMoveAction::movePart(SymbolPart& part) {
+	if (SymbolShape* s = part.isSymbolShape()) {
+		s->min_pos -= moved;
+		s->max_pos -= moved;
+		FOR_EACH(pnt, s->points) {
+			pnt->pos -= moved;
+		}
+	} else if (SymbolSymmetry* s = part.isSymbolSymmetry()) {
+		s->center -= moved;
+	} else if (SymbolGroup* g = part.isSymbolGroup()) {
+		FOR_EACH(p, g->parts) {
+			movePart(*p);
+		}
+		g->calculateBoundsNonRec();
+	} else {
+		throw InternalError(_("Invalid symbol part type"));
+	}
+}
 
 void SymbolPartMoveAction::move(const Vector2D& deltaDelta) {
 	delta += deltaDelta;
@@ -75,26 +85,34 @@ void SymbolPartMoveAction::move(const Vector2D& deltaDelta) {
 // ----------------------------------------------------------------------------- : Rotating symbol parts
 
 SymbolPartMatrixAction::SymbolPartMatrixAction(const set<SymbolPartP>& parts, const Vector2D& center)
-	: parts(parts)
+	: SymbolPartsAction(parts)
 	, center(center)
 {}
 
-void SymbolPartMatrixAction::transform(const Vector2D& mx, const Vector2D& my) {
-	// Transform each point
+void SymbolPartMatrixAction::transform(const Matrix2D& m) {
+	// Transform each part
 	FOR_EACH(p, parts) {
-		if (SymbolShape* s = p->isSymbolShape()) {
-			FOR_EACH(pnt, s->points) {
-				pnt->pos         = (pnt->pos - center).mul(mx,my) + center;
-				pnt->delta_before = pnt->delta_before.mul(mx,my);
-				pnt->delta_after  = pnt->delta_after .mul(mx,my);
-			}
-			// bounds change after transforming
-			s->calculateBounds();
-		} else if (SymbolSymmetry* s = p->isSymbolSymmetry()) {
-			s->handle = s->handle.mul(mx,my);
-		} else {
-			throw InternalError(_("Invalid symbol part type"));
+		transform(*p, m);
+	}
+}
+void SymbolPartMatrixAction::transform(SymbolPart& part, const Matrix2D& m) {
+	if (SymbolShape* s = part.isSymbolShape()) {
+		FOR_EACH(pnt, s->points) {
+			pnt->pos          = ((pnt->pos - center) * m) + center;
+			pnt->delta_before = pnt->delta_before * m;
+			pnt->delta_after  = pnt->delta_after  * m;
 		}
+		// bounds change after transforming
+		s->calculateBounds();
+	} else if (SymbolSymmetry* s = part.isSymbolSymmetry()) {
+		s->handle = s->handle * m;
+	} else if (SymbolGroup* g = part.isSymbolGroup()) {
+		FOR_EACH(p, g->parts) {
+			transform(*p, m);
+		}
+		g->calculateBoundsNonRec();
+	} else {
+		throw InternalError(_("Invalid symbol part type"));
 	}
 }
 
@@ -130,8 +148,8 @@ void SymbolPartRotateAction::rotateTo(double newAngle) {
 void SymbolPartRotateAction::rotateBy(double deltaAngle) {
 	// Rotation 'matrix'
 	transform(
-		Vector2D(cos(deltaAngle), -sin(deltaAngle)),
-		Vector2D(sin(deltaAngle),  cos(deltaAngle))
+		Matrix2D(cos(deltaAngle), -sin(deltaAngle)
+		        ,sin(deltaAngle),  cos(deltaAngle))
 	);
 }
 
@@ -170,8 +188,8 @@ void SymbolPartShearAction::move(const Vector2D& deltaShear) {
 void SymbolPartShearAction::shearBy(const Vector2D& shear) {
 	// Shear 'matrix'
 	transform(
-		Vector2D(1,       shear.x),
-		Vector2D(shear.y, 1)
+		Matrix2D(1,       shear.x
+		        ,shear.y, 1)
 	);
 }
 
@@ -180,7 +198,7 @@ void SymbolPartShearAction::shearBy(const Vector2D& shear) {
 
 
 SymbolPartScaleAction::SymbolPartScaleAction(const set<SymbolPartP>& parts, int scaleX, int scaleY)
-	: parts(parts)
+	: SymbolPartsAction(parts)
 	, scaleX(scaleX), scaleY(scaleY)
 	, constrain(false)
 	, snap(0)
@@ -189,10 +207,8 @@ SymbolPartScaleAction::SymbolPartScaleAction(const set<SymbolPartP>& parts, int
 	old_min = Vector2D( 1e6, 1e6);
 	Vector2D old_max  (-1e6,-1e6);
 	FOR_EACH(p, parts) {
-		if (SymbolShape* s = p->isSymbolShape()) {
-			old_min = piecewise_min(old_min, s->min_pos);
-			old_max = piecewise_max(old_max, s->max_pos);
-		}
+		old_min = piecewise_min(old_min, p->min_pos);
+		old_max = piecewise_max(old_max, p->max_pos);
 	}
 	// new == old
 	new_min  = new_real_min  = old_min;
@@ -244,26 +260,34 @@ void SymbolPartScaleAction::update() {
 }
 
 void SymbolPartScaleAction::transformAll() {
-	Vector2D scale = new_size.div(old_size);
 	FOR_EACH(p, parts) {
-		if (SymbolShape* s = p->isSymbolShape()) {
-			s->min_pos = transform(s->min_pos);
-			s->max_pos = transform(s->max_pos);
-			// make sure that max >= min
-			if (s->min_pos.x > s->max_pos.x) swap(s->min_pos.x, s->max_pos.x);
-			if (s->min_pos.y > s->max_pos.y) swap(s->min_pos.y, s->max_pos.y);
-			// scale all points
-			FOR_EACH(pnt, s->points) {
-				pnt->pos = transform(pnt->pos);
-				// also scale handles
-				pnt->delta_before = pnt->delta_before.mul(scale);
-				pnt->delta_after  = pnt->delta_after .mul(scale);
-			}
-		} else if (SymbolSymmetry* s = p->isSymbolSymmetry()) {
-			throw "TODO";
-		} else {
-			throw InternalError(_("Invalid symbol part type"));
+		transformPart(*p);
+	}
+}
+void SymbolPartScaleAction::transformPart(SymbolPart& part) {
+	if (SymbolShape* s = part.isSymbolShape()) {
+		Vector2D scale = new_size.div(old_size);
+		s->min_pos = transform(s->min_pos);
+		s->max_pos = transform(s->max_pos);
+		// make sure that max >= min
+		if (s->min_pos.x > s->max_pos.x) swap(s->min_pos.x, s->max_pos.x);
+		if (s->min_pos.y > s->max_pos.y) swap(s->min_pos.y, s->max_pos.y);
+		// scale all points
+		FOR_EACH(pnt, s->points) {
+			pnt->pos = transform(pnt->pos);
+			// also scale handles
+			pnt->delta_before = pnt->delta_before.mul(scale);
+			pnt->delta_after  = pnt->delta_after .mul(scale);
+		}
+	} else if (SymbolSymmetry* s = part.isSymbolSymmetry()) {
+		throw "TODO";
+	} else if (SymbolGroup* g = part.isSymbolGroup()) {
+		FOR_EACH(p, g->parts) {
+			transformPart(*p);
 		}
+		g->calculateBoundsNonRec();
+	} else {
+		throw InternalError(_("Invalid symbol part type"));
 	}
 }
 
@@ -274,11 +298,18 @@ Vector2D SymbolPartScaleAction::transform(const Vector2D& v) {
 
 // ----------------------------------------------------------------------------- : Change combine mode
 
-CombiningModeAction::CombiningModeAction(const set<SymbolPartP>& parts, SymbolShapeCombine mode) {
+CombiningModeAction::CombiningModeAction(const set<SymbolPartP>& parts, SymbolShapeCombine mode)
+	: SymbolPartsAction(parts)
+{
 	FOR_EACH(p, parts) {
-		if (p->isSymbolShape()) {
-			this->parts.push_back(make_pair(static_pointer_cast<SymbolShape>(p),mode));
-		}
+		add(p,mode);
+	}
+}
+void CombiningModeAction::add(const SymbolPartP& part, SymbolShapeCombine mode) {
+	if (part->isSymbolShape()) {
+		this->parts.push_back(make_pair(static_pointer_cast<SymbolShape>(part),mode));
+	} else if (SymbolGroup* g = part->isSymbolGroup()) {
+		FOR_EACH(p, g->parts) add(p, mode);
 	}
 }
 
@@ -294,16 +325,28 @@ void CombiningModeAction::perform(bool to_undo) {
 
 // ----------------------------------------------------------------------------- : Change name
 
-SymbolPartNameAction::SymbolPartNameAction(const SymbolPartP& part, const String& name)
+SymbolPartNameAction::SymbolPartNameAction(const SymbolPartP& part, const String& name, size_t old_cursor, size_t new_cursor)
 	: part(part), part_name(name)
+	, new_cursor(old_cursor), old_cursor(new_cursor) // will be swapped
 {}
 
 String SymbolPartNameAction::getName(bool to_undo) const {
 	return _ACTION_("change shape name");
 }
+bool SymbolPartNameAction::merge(const Action& action) {
+	TYPE_CASE(action, SymbolPartNameAction) {
+		if (action.part == part) {
+			// adjacent actions on the same part, discard the other one,
+			// because it only keeps an intermediate value
+			return true;
+		}
+	}
+	return false;
+}
 
 void SymbolPartNameAction::perform(bool to_undo) {
 	swap(part->name, part_name);
+	swap(old_cursor, new_cursor);
 }
 
 // ----------------------------------------------------------------------------- : Add symbol part
@@ -313,7 +356,7 @@ AddSymbolPartAction::AddSymbolPartAction(Symbol& symbol, const SymbolPartP& part
 {}
 
 String AddSymbolPartAction::getName(bool to_undo) const {
-	return format_string(_ACTION_("add"), part->name);
+	return format_string(_ACTION_("add part"), part->name);
 }
 
 void AddSymbolPartAction::perform(bool to_undo) {
@@ -407,8 +450,8 @@ void DuplicateSymbolPartsAction::getParts(set<SymbolPartP>& parts) {
 
 // ----------------------------------------------------------------------------- : Reorder symbol parts
 
-ReorderSymbolPartsAction::ReorderSymbolPartsAction(Symbol& symbol, size_t part_id1, size_t part_id2)
-	: symbol(symbol), part_id1(part_id1), part_id2(part_id2)
+ReorderSymbolPartsAction::ReorderSymbolPartsAction(Symbol& symbol, size_t old_position, size_t new_position)
+	: symbol(symbol), old_position(old_position), new_position(new_position)
 {}
 
 String ReorderSymbolPartsAction::getName(bool to_undo) const {
@@ -416,9 +459,12 @@ String ReorderSymbolPartsAction::getName(bool to_undo) const {
 }
 
 void ReorderSymbolPartsAction::perform(bool to_undo) {
-	assert(part_id1 < symbol.parts.size());
-	assert(part_id2 < symbol.parts.size());
-	swap(symbol.parts[part_id1], symbol.parts[part_id2]);
+	assert(old_position < symbol.parts.size());
+	assert(new_position < symbol.parts.size());
+	SymbolPartP part = symbol.parts.at(old_position);
+	symbol.parts.erase( symbol.parts.begin() + old_position);
+	symbol.parts.insert(symbol.parts.begin() + new_position, part);
+	swap(old_position, new_position);
 }
 
 // ----------------------------------------------------------------------------- : Group symbol parts
@@ -439,6 +485,7 @@ GroupSymbolPartsAction::GroupSymbolPartsAction(Symbol& symbol, const set<SymbolP
 	group->name = _("Group");
 	FOR_EACH(p, symbol.parts) {
 		if (parts.find(p) != parts.end()) {
+			// add to group instead
 			group->parts.push_back(p);
 			if (!done) {
 				done = true;
@@ -449,6 +496,7 @@ GroupSymbolPartsAction::GroupSymbolPartsAction(Symbol& symbol, const set<SymbolP
 			old_part_list.push_back(p);
 		}
 	}
+	group->calculateBounds();
 }
 String GroupSymbolPartsAction::getName(bool to_undo) const {
 	return _ACTION_("group parts");

src/data/action/symbol.hpp

@@ -20,16 +20,24 @@
 
 // ----------------------------------------------------------------------------- : Transform symbol part
 
-/// Anything that changes a part
+/// Anything that changes one or more parts
 class SymbolPartAction : public Action {};
 
+/// Anything that changes a set of parts
+class SymbolPartsAction : public SymbolPartAction {
+  public:
+	SymbolPartsAction(const set<SymbolPartP>& parts);
+	
+	const set<SymbolPartP> parts;	///< Affected parts
+};
+
 /// Anything that changes a part as displayed in the part list
 class SymbolPartListAction : public SymbolPartAction {};
 
 // ----------------------------------------------------------------------------- : Moving symbol parts
 
 /// Move some symbol parts
-class SymbolPartMoveAction : public SymbolPartAction {
+class SymbolPartMoveAction : public SymbolPartsAction {
   public:
 	SymbolPartMoveAction(const set<SymbolPartP>& parts, const Vector2D& delta = Vector2D());
 	
@@ -40,10 +48,11 @@ class SymbolPartMoveAction : public SymbolPartAction {
 	void move(const Vector2D& delta);
 	
   private:
-	set<SymbolPartP> parts;		///< Parts to move
 	Vector2D delta;				///< How much to move
 	Vector2D moved;				///< How much has been moved
 	Vector2D min_pos, max_pos;	///< Bounding box of the thing we are moving
+	
+	void movePart(SymbolPart& part); ///< Move a single part
   public:
 	bool constrain;				///< Constrain movement?
 	int snap;					///< Snap to grid?
@@ -52,7 +61,7 @@ class SymbolPartMoveAction : public SymbolPartAction {
 // ----------------------------------------------------------------------------- : Rotating symbol parts
 
 /// Transforming symbol parts using a matrix
-class SymbolPartMatrixAction : public SymbolPartAction {
+class SymbolPartMatrixAction : public SymbolPartsAction {
   public:
 	SymbolPartMatrixAction(const set<SymbolPartP>& parts, const Vector2D& center);
 	
@@ -61,10 +70,10 @@ class SymbolPartMatrixAction : public SymbolPartAction {
 	
   protected:
 	/// Perform the transformation using the given matrix
-	void transform(const Vector2D& mx, const Vector2D& my);
+	void transform(const Matrix2D& m);
+	void transform(SymbolPart& part, const Matrix2D& m);
 	
-	set<SymbolPartP> parts;	///< Parts to transform
-	Vector2D center;			///< Center to transform around
+	Vector2D center; ///< Center to transform around
 };
 
 /// Rotate some symbol parts
@@ -114,7 +123,7 @@ class SymbolPartShearAction : public SymbolPartMatrixAction {
 // ----------------------------------------------------------------------------- : Scaling symbol parts
 
 /// Scale some symbol parts
-class SymbolPartScaleAction : public SymbolPartAction {
+class SymbolPartScaleAction : public SymbolPartsAction {
   public:
 	SymbolPartScaleAction(const set<SymbolPartP>& parts, int scaleX, int scaleY);
 	
@@ -127,13 +136,13 @@ class SymbolPartScaleAction : public SymbolPartAction {
 	void update();
 	
   private:
-	set<SymbolPartP> parts;					///< Parts to scale
 	Vector2D old_min,      old_size;		///< the original pos/size
 	Vector2D new_real_min, new_real_size;	///< the target pos/sizevoid shearBy(const Vector2D& shear)
 	Vector2D new_min,      new_size;		///< the target pos/size after applying constrains
 	int scaleX, scaleY;						///< to what corner are we attached?
 	/// Transform everything in the parts
 	void transformAll();
+	void transformPart(SymbolPart&);
 	/// Transform a single vector
 	inline Vector2D transform(const Vector2D& v);
   public:
@@ -144,7 +153,7 @@ class SymbolPartScaleAction : public SymbolPartAction {
 // ----------------------------------------------------------------------------- : Change combine mode
 
 /// Change the name of a symbol part
-class CombiningModeAction : public SymbolPartListAction {
+class CombiningModeAction : public SymbolPartsAction {
   public:
 	// All parts must be SymbolParts
 	CombiningModeAction(const set<SymbolPartP>& parts, SymbolShapeCombine mode);
@@ -153,22 +162,26 @@ class CombiningModeAction : public SymbolPartListAction {
 	virtual void   perform(bool to_undo);
 	
   private:
+	void add(const SymbolPartP&, SymbolShapeCombine mode);
 	vector<pair<SymbolShapeP,SymbolShapeCombine> > parts;	///< Affected parts with new combining modes
 };
 
 // ----------------------------------------------------------------------------- : Change name
 
 /// Change the name of a symbol part
-class SymbolPartNameAction : public SymbolPartListAction {
+class SymbolPartNameAction : public SymbolPartAction {
   public:
-	SymbolPartNameAction(const SymbolPartP& part, const String& name);
+	SymbolPartNameAction(const SymbolPartP& part, const String& name, size_t old_cursor, size_t new_cursor);
 	
 	virtual String getName(bool to_undo) const;
 	virtual void   perform(bool to_undo);
+	virtual bool merge(const Action& action);
 	
-  private:
+  public:
 	SymbolPartP part;	///< Affected part
 	String part_name;	///< New name
+	size_t old_cursor;	///< Cursor position
+	size_t new_cursor;	///< Cursor position
 };
 
 // ----------------------------------------------------------------------------- : Add symbol part
@@ -224,18 +237,18 @@ class DuplicateSymbolPartsAction : public SymbolPartListAction {
 
 // ----------------------------------------------------------------------------- : Reorder symbol parts
 
-/// Change the position of a part in a symbol, by swapping two parts.
+/// Change the position of a part in a symbol, by moving a part.
 class ReorderSymbolPartsAction : public SymbolPartListAction {
   public:
-	ReorderSymbolPartsAction(Symbol& symbol, size_t part_id1, size_t part_id2);
+	ReorderSymbolPartsAction(Symbol& symbol, size_t old_position, size_t new_position);
   
 	virtual String getName(bool to_undo) const;
 	virtual void   perform(bool to_undo);
 	
   private:
-	Symbol& symbol;				///< Symbol to swap the parts in
+	Symbol& symbol;						///< Symbol to swap the parts in
   public:
-	size_t part_id1, part_id2;	///< Indices of parts to swap
+	size_t old_position, new_position;	///< Positions to move from and to
 };
 
 

src/data/action/symbol_part.cpp

@@ -349,8 +349,8 @@ SinglePointRemoveAction::SinglePointRemoveAction(const SymbolShapeP& shape, UInt
 		Vector2D p = c.pointAt(t);
 		Vector2D distP = point->pos - p;
 		// adjust handle sizes
-		point1.other.delta_after  *= ssqrt(distP.dot(point1.other.delta_after) /point1.other.delta_after.lengthSqr())  + 1;
-		point2.other.delta_before *= ssqrt(distP.dot(point2.other.delta_before)/point2.other.delta_before.lengthSqr()) + 1;
+		point1.other.delta_after  *= ssqrt(dot(distP, point1.other.delta_after) /point1.other.delta_after.lengthSqr())  + 1;
+		point2.other.delta_before *= ssqrt(dot(distP, point2.other.delta_before)/point2.other.delta_before.lengthSqr()) + 1;
 	
 		// unlock if needed
 		if (point1.other.lock == LOCK_SIZE) point1.other.lock = LOCK_DIR;

src/data/format/image_to_symbol.cpp

@@ -245,7 +245,7 @@ void mark_corners(SymbolShape& shape) {
 		Vector2D after   = .6 * shape.getPoint(i+1)->pos + .2 * shape.getPoint(i+2)->pos + .1 * shape.getPoint(i+3)->pos + .1 * shape.getPoint(i+4)->pos;
 		before = (before - current.pos).normalized();
 		after  = (after  - current.pos).normalized();
-		if (before.dot(after) >= -0.25f) {
+		if (dot(before,after) >= -0.25f) {
 			// corner
 			current.lock = LOCK_FREE;
 		} else {
@@ -285,8 +285,8 @@ void merge_corners(SymbolShape& shape) {
 		for (int j = 0 ; j < 4 ; ++j) {
 			Vector2D a_ = (shape.getPoint(i-j-1)->pos - prev.pos).normalized();
 			Vector2D b_ = (shape.getPoint(i+j)->pos   - cur.pos).normalized();
-			double a_dot =  a_.dot(ab);
-			double b_dot = -b_.dot(ab);
+			double a_dot =  dot(a_, ab);
+			double b_dot = -dot(b_, ab);
 			if (a_dot < min_a_dot) {
 				min_a_dot = a_dot;
 				a = a_;
@@ -300,8 +300,8 @@ void merge_corners(SymbolShape& shape) {
 		//  t a + ab = u b, solve for t,u
 		// Gives us:
 		//  t = ab cross b / b cross a
-		double tden = max(0.00000001, b.cross(a));
-		double t  = ab.cross(b) / tden;
+		double tden = max(0.00000001, cross(b,a));
+		double t  = cross(ab,b) / tden;
 		// do these tangent lines intersect, and not too far away?
 		// if so, then the intersection point is the merged point
 		if (t >= 0 && t < 20.0) {
@@ -358,7 +358,7 @@ void straighten(SymbolShape& shape) {
 		Vector2D bb = next.delta_before.normalized();
 		// if the area beneath the polygon formed by the handles is small
 		// then it is a straight line
-		double cpDot = abs(aa.cross(ab)) + abs(bb.cross(ab));
+		double cpDot = abs(cross(aa,ab)) + abs(cross(bb,ab));
 		if (cpDot < treshold) {
 			cur.segment_after = next.segment_before = SEGMENT_LINE;
 			cur.delta_after = next.delta_before = Vector2D();

src/data/symbol.cpp

@@ -94,6 +94,11 @@ Vector2D& ControlPoint::getOther(WhichHandle wh) {
 
 // ----------------------------------------------------------------------------- : SymbolPart
 
+void SymbolPart::calculateBounds() {
+	min_pos =  Vector2D::infinity();
+	max_pos = -Vector2D::infinity();
+}
+
 IMPLEMENT_REFLECTION(SymbolPart) {
 	REFLECT_IF_NOT_READING {
 		String type = typeName();
@@ -235,6 +240,19 @@ SymbolPartP SymbolGroup::clone() const {
 	return part;
 }
 
+void SymbolGroup::calculateBounds() {
+	FOR_EACH(p, parts) p->calculateBounds();
+	calculateBoundsNonRec();
+}
+void SymbolGroup::calculateBoundsNonRec() {
+	min_pos =  Vector2D::infinity();
+	max_pos = -Vector2D::infinity();
+	FOR_EACH(p, parts) {
+		min_pos = piecewise_min(min_pos, p->min_pos);
+		max_pos = piecewise_max(max_pos, p->max_pos);
+	}
+}
+
 IMPLEMENT_REFLECTION(SymbolGroup) {
 	REFLECT_BASE(SymbolPart);
 	REFLECT(parts);

src/data/symbol.hpp

@@ -112,6 +112,9 @@ class SymbolPart : public IntrusivePtrVirtualBase {
   public:
 	/// Name/label for this part
 	String name;
+	/// Position and size of the part.
+	/** this is the smallest axis aligned bounding box that fits around the part */
+	Vector2D min_pos, max_pos;
 	
 	/// Type of this part
 	virtual String typeName() const = 0;
@@ -130,6 +133,9 @@ class SymbolPart : public IntrusivePtrVirtualBase {
 	virtual       SymbolGroup*    isSymbolGroup()          { return nullptr; }
 	virtual const SymbolGroup*    isSymbolGroup()    const { return nullptr; }
 	
+	/// Calculate the position and size of the part (min_pos and max_pos)
+	virtual void calculateBounds();
+	
 	DECLARE_REFLECTION_VIRTUAL();
 };
 
@@ -162,9 +168,6 @@ class SymbolShape : public SymbolPart {
 	SymbolShapeCombine combine;
 	// Center of rotation, relative to the part, when the part is scaled to [0..1]
 	Vector2D rotation_center;
-	/// Position and size of the part
-	/// this is the smallest axis aligned bounding box that fits around the part
-	Vector2D min_pos, max_pos;
 	
 	SymbolShape();
 	
@@ -183,7 +186,7 @@ class SymbolShape : public SymbolPart {
 	void enforceConstraints();
 	
 	/// Calculate the position and size of the part
-	void calculateBounds();
+	virtual void calculateBounds();
 	
 	DECLARE_REFLECTION();
 };
@@ -221,7 +224,7 @@ class SymbolSymmetry : public SymbolPart {
 /// A group of symbol parts
 class SymbolGroup : public SymbolPart {
   public:
-	vector<SymbolPartP> parts;	///< The parts in this group
+	vector<SymbolPartP> parts;	///< The parts in this group, first item is on top
 	
 	virtual String typeName() const;
 	virtual SymbolPartP clone() const;
@@ -229,16 +232,18 @@ class SymbolGroup : public SymbolPart {
 	virtual       SymbolGroup* isSymbolGroup()       { return this; }
 	virtual const SymbolGroup* isSymbolGroup() const { return this; }
 	
+	virtual void calculateBounds();
+	/// re-calculate the bounds, but not of the contained parts
+	void calculateBoundsNonRec();
+	
 	DECLARE_REFLECTION();
 };
 
 // ----------------------------------------------------------------------------- : Symbol
 
 /// An editable symbol, consists of any number of SymbolParts
-class Symbol : public IntrusivePtrBase<Symbol> {
+class Symbol : public SymbolGroup {
   public:
-	/// The parts of this symbol, first item is on top
-	vector<SymbolPartP> parts;
 	/// Actions performed on this symbol and the parts in it
 	ActionStack actions;
 	

src/gfx/bezier.cpp

@@ -203,7 +203,7 @@ bool pos_on_line(const Vector2D& pos, double range, const Vector2D& p1, const Ve
 	Vector2D p21 = p2 - p1;
 	double p21len = p21.lengthSqr();
 	if (p21len < 0.00001) return false; // line is too short
-	t = p21.dot(pos - p1) / p21len; // 'time' on line p1->p2
+	t = dot(p21, pos - p1) / p21len; // 'time' on line p1->p2
 	if (t < 0 || t > 1) return false; // outside segment
 	pOut = p1 + p21 * t; // point on line
 	Vector2D dist = pOut - pos; // distance to line

src/gui/symbol/basic_shape_editor.cpp

@@ -9,7 +9,9 @@
 #include <gui/symbol/basic_shape_editor.hpp>
 #include <gui/util.hpp>
 #include <util/window_id.hpp>
+#include <data/settings.hpp>
 #include <data/action/symbol.hpp>
+#include <data/action/symbol_part.hpp>
 #include <wx/spinctrl.h>
 
 // ----------------------------------------------------------------------------- : SymbolBasicShapeEditor
@@ -108,7 +110,7 @@ void SymbolBasicShapeEditor::onMouseDrag  (const Vector2D& from, const Vector2D&
 	// Resize the object
 	if (drawing) {
 		end = to;
-		makeShape(start, end, ev.ControlDown(), ev.ShiftDown());
+		makeShape(start, end, ev.ControlDown(), settings.symbol_grid_snap, ev.ShiftDown());
 		control.Refresh(false);
 	}
 }
@@ -119,7 +121,7 @@ void SymbolBasicShapeEditor::onKeyChange(wxKeyEvent& ev) {
 	if (drawing) {
 		if (ev.GetKeyCode() == WXK_CONTROL || ev.GetKeyCode() == WXK_SHIFT) {
 			// changed constrains
-			makeShape(start, end, ev.ControlDown(), ev.ShiftDown());
+			makeShape(start, end, ev.ControlDown(), settings.symbol_grid_snap, ev.ShiftDown());
 			control.Refresh(false);
 		} else if (ev.GetKeyCode() == WXK_ESCAPE) {
 			// cancel drawing
@@ -156,7 +158,12 @@ inline double sgn(double d) {
 	return d < 0 ? - 1 : 1;
 }
 
-void SymbolBasicShapeEditor::makeShape(const Vector2D& a, const Vector2D& b, bool constrained, bool centered) {
+void SymbolBasicShapeEditor::makeShape(Vector2D a, Vector2D b, bool constrained, bool snap, bool centered) {
+	// snap
+	if (snap) {
+		a = snap_vector(a, settings.symbol_grid_size);
+		b = snap_vector(b, settings.symbol_grid_size);
+	}
 	// constrain
 	Vector2D size = b - a;
 	if (constrained) {

src/gui/symbol/basic_shape_editor.hpp

@@ -63,7 +63,7 @@ class SymbolBasicShapeEditor : public SymbolEditorBase {
 	/**  when centered: a = center, b-a = radius
 	 *   otherwise:     a = top left, b = bottom right
 	 */
-	void makeShape(const Vector2D& a, const Vector2D& b, bool constrained, bool centered);
+	void makeShape(Vector2D a, Vector2D b, bool constrained, bool snap, bool centered);
 	
 	/// Make the shape, centered in c, with radius r
 	void makeCenteredShape(const Vector2D& c, Vector2D r, bool constrained);

src/gui/symbol/control.cpp

@@ -162,20 +162,20 @@ void SymbolControl::draw(DC& dc) {
 	SymbolViewer::draw(dc);
 	// draw grid
 	if (settings.symbol_grid) {
-		wxSize s = dc.GetSize();
 		double lines = settings.symbol_grid_size;
+		double end = rotation.trS(1);
 		for (int i = 0 ; i <= lines ; ++i) {
 			int x = (int) floor(rotation.trS(i/lines-0.0001));
 			//dc.SetPen(Color(0, i%5 == 0 ? 64 : 31, 0));
 			//dc.SetPen(Color(i%5 == 0 ? 64 : 31, 0, 0));
 			dc.SetLogicalFunction(wxAND);
 			dc.SetPen(i%5 == 0 ? Color(191,255,191) : Color(191, 255, 191));
-			dc.DrawLine(x, 0, x, s.y);
-			dc.DrawLine(0, x, s.x, x);
+			dc.DrawLine(x, 0, x, end);
+			dc.DrawLine(0, x, end, x);
 			dc.SetLogicalFunction(wxOR);
 			dc.SetPen(i%5 == 0 ? Color(0,63,0) : Color(0, 31, 0));
-			dc.DrawLine(x, 0, x, s.y);
-			dc.DrawLine(0, x, s.x, x);
+			dc.DrawLine(x, 0, x, end);
+			dc.DrawLine(0, x, end, x);
 		}
 		dc.SetLogicalFunction(wxCOPY);
 	}
@@ -251,7 +251,7 @@ void SymbolControl::onUpdateUI(wxUpdateUIEvent& ev) {
 			ev.Check(editor->modeToolId() == ev.GetId());
 			if (ev.GetId() == ID_MODE_POINTS) {
 				// can only edit points when a single part is selected <TODO?>
-				ev.Enable(selected_parts.size() == 1);
+				ev.Enable(selected_parts.size() == 1 && (*selected_parts.begin())->isSymbolShape());
 			}
 			break;
 		case ID_MODE_PAINT:

src/gui/symbol/control.hpp

@@ -72,7 +72,8 @@ class SymbolControl : public wxControl, public SymbolViewer {
   public: 
 	/// What parts are selected?
 	set<SymbolPartP> selected_parts;
-	SymbolShapeP     selected_shape; // if there is a single selection
+	SymbolPartP      highlight_part; ///< part the mouse cursor is over
+	SymbolShapeP     selected_shape; ///< if there is a single selection
 	
 	/// Parent window 
 	SymbolWindow* parent;

src/gui/symbol/part_list.cpp

@@ -9,147 +9,455 @@
 #include <gui/symbol/part_list.hpp>
 #include <gui/util.hpp>
 #include <data/action/symbol.hpp>
-#include <wx/imaglist.h>
+#include <gfx/gfx.hpp>
+#include <render/symbol/filter.hpp>
+#include <wx/dcbuffer.h>
+#include <wx/caret.h>
 
-// ----------------------------------------------------------------------------- : Constructor
+DECLARE_TYPEOF_COLLECTION(SymbolPartP);
 
-SymbolPartList::SymbolPartList(Window* parent, int id, SymbolP symbol)
-	: wxListCtrl(parent, id, wxDefaultPosition, wxDefaultSize,
-					wxLC_REPORT | wxLC_NO_HEADER | wxLC_VIRTUAL | wxLC_EDIT_LABELS)
+// ----------------------------------------------------------------------------- : Events
+
+DEFINE_EVENT_TYPE(EVENT_PART_SELECT);
+DEFINE_EVENT_TYPE(EVENT_PART_ACTIVATE);
+
+// ----------------------------------------------------------------------------- : SymbolPartList
+
+
+SymbolPartList::SymbolPartList(Window* parent, int id, set<SymbolPartP>& selection, SymbolP symbol)
+	: wxScrolledWindow(parent, id, wxDefaultPosition, wxDefaultSize, wxSUNKEN_BORDER | wxVSCROLL)
+	, selection(selection)
+	, state_icons(9,8)
 {
-	// Create image list
-	wxImageList* images = new wxImageList(16,16);
 	// NOTE: this is based on the order of the SymbolShapeCombine and SymbolSymmetryType enums!
-	images->Add(load_resource_image(_("combine_or")));
-	images->Add(load_resource_image(_("combine_sub")));
-	images->Add(load_resource_image(_("combine_and")));
-	images->Add(load_resource_image(_("combine_xor")));
-	images->Add(load_resource_image(_("combine_over")));
-	images->Add(load_resource_image(_("combine_border")));
-	images->Add(load_resource_image(_("symmetry_rotation")));
-	images->Add(load_resource_image(_("symmetry_reflection")));
-	AssignImageList(images, wxIMAGE_LIST_SMALL);
-	// create columns
-	InsertColumn(0, _("Name"));
+	state_icons.Add(load_resource_image(_("icon_combine_merge")));
+	state_icons.Add(load_resource_image(_("icon_combine_subtract")));
+	state_icons.Add(load_resource_image(_("icon_combine_intersection")));
+	state_icons.Add(load_resource_image(_("icon_combine_difference")));
+	state_icons.Add(load_resource_image(_("icon_combine_overlap")));
+	state_icons.Add(load_resource_image(_("icon_combine_border")));
+	state_icons.Add(load_resource_image(_("icon_symmetry_rotation")));
+	state_icons.Add(load_resource_image(_("icon_symmetry_reflection")));
+	state_icons.Add(load_resource_image(_("icon_symbol_group")));
 	// view symbol
 	setSymbol(symbol);
 }
 
-// ----------------------------------------------------------------------------- : View events
-
 void SymbolPartList::onChangeSymbol() {
+	typing_in = SymbolPartP();
+	cursor = 0;
 	update();
 }
 
 void SymbolPartList::onAction(const Action& action, bool undone) {
-	TYPE_CASE(action, ReorderSymbolPartsAction) {
-		if (selected == (long) action.part_id1) {
-			selectItem((long) action.part_id2);
-		} else if (selected == (long) action.part_id2) {
-			selectItem((long) action.part_id1);
+	TYPE_CASE(action, SymbolPartNameAction) {
+		if (typing_in == action.part) {
+			cursor = action.new_cursor;
 		}
+		Refresh(false);
+		if (true) return;
 	}
 	TYPE_CASE_(action, SymbolPartListAction) {
 		update();
+		return;
+	}
+	TYPE_CASE(action, SymbolPartsAction) {
+		symbol_preview.up_to_date = false;
+		updateParts(action.parts);
+		if (true) return;
+	}
+	TYPE_CASE_(action, SymbolPartAction) {
+		symbol_preview.up_to_date = false;
+		// some part changed, but we don't know which one, assume it is the selection
+		updateParts(selection);
+		return;
 	}
 }
 
-// ----------------------------------------------------------------------------- : Other
+wxSize SymbolPartList::DoGetBestSize() const {
+	wxSize ws = GetSize(), cs = GetClientSize();
+	const int w = 110;
+	const int h = ITEM_HEIGHT;
+	return wxSize(w, h) + ws - cs;
+}
 
-String SymbolPartList::OnGetItemText(long item, long col) const {
-	assert(col == 0);
-	return getPart(item)->name;
+void SymbolPartList::update() {
+	// count items
+	number_of_items = childCount(symbol);
+	SetVirtualSize(110, number_of_items * (ITEM_HEIGHT+1));
+	// invalidate previews
+	symbol_preview.up_to_date = false;
+	for (size_t i = 0 ; i < part_previews.size() ; ++i) {
+		part_previews[i].up_to_date = false;
+	}
+	// refresh
+	Refresh(false);
+}
+void SymbolPartList::updateParts(const set<SymbolPartP>& parts) {
+	symbol_preview.up_to_date = false;
+	int i = 0;
+	FOR_EACH(p, symbol->parts) {
+		updatePart(parts, i, false, p);
+	}
+	// refresh
+	Refresh(false);
 }
-int SymbolPartList::OnGetItemImage(long item) const {
-	return getPart(item)->icon();
+void SymbolPartList::updatePart(const set<SymbolPartP>& parts, int& i, bool parent_updated, const SymbolPartP& part) {
+	bool update = parent_updated || parts.find(part) != parts.end();
+	if (update) {
+		part_previews[i].up_to_date = false;
+	}
+	++i;
+	if (SymbolGroup* g = part->isSymbolGroup()) {
+		FOR_EACH(p, g->parts) {
+			updatePart(parts, i, update, p);
+		}
+	}
 }
 
-SymbolPartP SymbolPartList::getPart(long item) const {
-	return symbol->parts.at(item);
+// ----------------------------------------------------------------------------- : Events
+
+void SymbolPartList::onLeftDown(wxMouseEvent& ev) {
+	// find item under cursor
+	if (ev.GetX() < 0 || ev.GetX() >= GetClientSize().x) return;
+	SymbolPartP part = findItem(ev.GetY() / (ITEM_HEIGHT + 1));
+	if (part) {
+		// toggle/select
+		if (!ev.ShiftDown()) {
+			selection.clear();
+		}
+		if (selection.find(part) != selection.end()) {
+			selection.erase(part);
+		} else {
+			selection.insert(part);
+		}
+		if (!ev.ShiftDown()) {
+			// drag item
+			mouse_down_on = part;
+			drop_position = -1;
+			CaptureMouse();
+		}
+		sendEvent(EVENT_PART_SELECT);
+		Refresh(false);
+	}
+	ev.Skip(); // for focus
 }
-void SymbolPartList::selectItem(long item) {
-	selected = (long)item;
-	long count = GetItemCount();
-	for (long i = 0 ; i < count ; ++i) {
-		SetItemState(i, i == selected ? wxLIST_STATE_SELECTED | wxLIST_STATE_FOCUSED : 0,
-		                                wxLIST_STATE_SELECTED | wxLIST_STATE_FOCUSED);
+void SymbolPartList::onLeftUp(wxMouseEvent& ev) {
+	if (HasCapture()) ReleaseMouse();
+	if (mouse_down_on && drop_position != -1) {
+		// move part
+		// find old position
+		vector<SymbolPartP>::const_iterator it = find(symbol->parts.begin(), symbol->parts.end(), mouse_down_on);
+		mouse_down_on = SymbolPartP();
+		if (it == symbol->parts.end()) {
+			Refresh(false);
+			return;
+		}
+		size_t old_position = it - symbol->parts.begin();
+		// find new position
+		size_t new_position;
+		SymbolPartP drop_before = findItem(drop_position);
+		it = find(symbol->parts.begin(), symbol->parts.end(), drop_before);
+		if (it == symbol->parts.end()) {
+			new_position = number_of_items - 1;
+		} else {
+			new_position = it - symbol->parts.begin();
+			if (old_position < new_position) new_position -= 1;
+		}
+		// move part
+		if (old_position != new_position) {
+			symbol->actions.add(new ReorderSymbolPartsAction(*symbol, old_position, new_position));
+		} else {
+			Refresh(false);
+		}
+	} else {
+		mouse_down_on = SymbolPartP();
 	}
 }
+void SymbolPartList::onMotion(wxMouseEvent& ev) {
+	if (mouse_down_on) {
+		int new_drop_position = (ev.GetY() + ITEM_HEIGHT/2) / (ITEM_HEIGHT + 1);
+		if (new_drop_position < 0 || new_drop_position > number_of_items) new_drop_position = -1;
+		// TODO: make sure it is not in a group
+		if (drop_position != new_drop_position) {
+			drop_position = new_drop_position;
+			Refresh(false);
+		}
+	}
+}
+
+void SymbolPartList::onLeftDClick(wxMouseEvent& ev) {
+	// double click = activate
+	sendEvent(EVENT_PART_ACTIVATE);
+}
 
-void SymbolPartList::getSelectedParts(set<SymbolPartP>& sel) {
-	sel.clear();
-	long count = GetItemCount();
-	for (long i = 0 ; i < count ; ++ i) {
-		bool selected = GetItemState(i, wxLIST_STATE_SELECTED);
-		if (selected) sel.insert(symbol->parts.at(i));
+void SymbolPartList::onChar(wxKeyEvent& ev) {
+	if (typing_in) {
+		// Typing in name
+		String new_name = typing_in->name;
+		switch (ev.GetKeyCode()) {
+			case WXK_HOME:
+				if (cursor != 0) {
+					cursor = 0; Refresh(false); // TODO: without refresh
+				}
+				break;
+			case WXK_END:
+				if (cursor != typing_in->name.size()) {
+					cursor = typing_in->name.size(); Refresh(false);
+				}
+				break;
+			case WXK_LEFT:
+				if (cursor > 0) {
+					--cursor; Refresh(false);
+				}
+				break;
+			case WXK_RIGHT:
+				if (cursor < typing_in->name.size()) {
+					++cursor; Refresh(false);
+				}
+				break;
+			case WXK_BACK:
+				if (cursor > 0 && cursor <= typing_in->name.size()) {
+					String new_name = typing_in->name;
+					new_name.erase(cursor - 1, 1);
+					symbol->actions.add(new SymbolPartNameAction(typing_in, new_name, cursor, cursor - 1));
+				}
+				break;
+			case WXK_DELETE:
+				if (cursor < typing_in->name.size()) {
+					String new_name = typing_in->name;
+					new_name.erase(cursor, 1);
+					symbol->actions.add(new SymbolPartNameAction(typing_in, new_name, cursor, cursor));
+				}
+				break;
+			default:
+			  // See gui/value/text.cpp
+			  #ifdef __WXMSW__
+				if (ev.GetKeyCode() >= _(' ') && ev.GetKeyCode() == (int)ev.GetRawKeyCode()) {
+			  #else
+				if (ev.GetKeyCode() >= _(' ') /*&& ev.GetKeyCode() == (int)ev.GetRawKeyCode()*/) {
+			  #endif
+					#ifdef UNICODE
+						Char key = ev.GetUnicodeKey();
+					#else
+						Char key = (Char)ev.GetKeyCode();
+					#endif
+					String new_name = typing_in->name;
+					new_name.insert(cursor, 1, key);
+					symbol->actions.add(new SymbolPartNameAction(typing_in, new_name, cursor, cursor + 1));
+				}
+		}
 	}
+	// Move up/down?
 }
 
-void SymbolPartList::selectParts(const set<SymbolPartP>& sel) {
-	long count = GetItemCount();
-	for (long i = 0 ; i < count ; ++ i) {
-		// is that part selected?
-		bool selected = sel.find(symbol->parts.at(i)) != sel.end();
-		SetItemState(i, selected ? wxLIST_STATE_SELECTED : 0,
-			                       wxLIST_STATE_SELECTED);
-	}	
+void SymbolPartList::onSize(wxSizeEvent&) {
+	Refresh(false);
 }
 
-void SymbolPartList::update() {
-	if (symbol->parts.empty()) {
-		// deleting all items requires a full refresh on win32
-		SetItemCount(0);
-		Refresh(true);
+void SymbolPartList::sendEvent(int type) {
+	wxCommandEvent ev(type, GetId());
+	ProcessEvent(ev);
+}
+
+// ----------------------------------------------------------------------------- : Items
+
+SymbolPartP SymbolPartList::findItem(int i) const {
+	FOR_EACH(p, symbol->parts) {
+		SymbolPartP f = findItem(i, p);
+		if (f) return f;
+	}
+	return SymbolPartP();
+}
+SymbolPartP SymbolPartList::findItem(int& i, const SymbolPartP& part) {
+	if (i < 0 ) return SymbolPartP();
+	if (i == 0) return part;
+	i -= 1;
+	// sub item?
+	if (SymbolGroup* g = part->isSymbolGroup()) {
+		FOR_EACH(p, g->parts) {
+			if (findItem(i, p)) return part;
+		}
+	}
+	return SymbolPartP();
+}
+
+int SymbolPartList::childCount(const SymbolPartP& part) {
+	if (SymbolGroup* g = part->isSymbolGroup()) {
+		int count = 0;
+		FOR_EACH(p, g->parts) count += 1 + childCount(p);
+		return count;
 	} else {
-		SetItemCount((long) symbol->parts.size() );
-		Refresh(false);
+		return 0;
 	}
 }
 
-// ----------------------------------------------------------------------------- : Event handling
+// ----------------------------------------------------------------------------- : Text editor
+
+
+// ----------------------------------------------------------------------------- : Drawing
+
 
-void SymbolPartList::onSelect(wxListEvent& ev) {
-	selected = ev.GetIndex();
-	ev.Skip();
+void SymbolPartList::onPaint(wxPaintEvent&) {
+	wxBufferedPaintDC dc(this);
+	DoPrepareDC(dc);
+	OnDraw(dc);
 }
-void SymbolPartList::onDeselect(wxListEvent& ev) {
-	selected = -1;
-	ev.Skip();
+void SymbolPartList::OnDraw(DC& dc) {
+	// init
+	dc.SetFont(*wxNORMAL_FONT);
+	// clear background
+	wxSize size = GetClientSize();
+	dc.SetPen(*wxTRANSPARENT_PEN);
+	dc.SetBrush(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
+	dc.DrawRectangle(0,0,size.x,size.y);
+	// items
+	int i = 0;
+	FOR_EACH(p, symbol->parts) {
+		drawItem(dc, 0, i, false, p);
+	}
+	// drag/drop indicator
+	if (mouse_down_on && drop_position != -1) {
+		dc.SetPen(wxPen(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT), 3));
+		int y = drop_position * (ITEM_HEIGHT + 1) - 1;
+		dc.DrawLine(0,y,size.x,y);
+		dc.DrawLine(0,y-3,0,y+3);
+		dc.DrawLine(size.x-1,y-3,size.x-1,y+3);
+	}
+	// hide caret
+	if (selection.size() != 1) {
+		typing_in = SymbolPartP();
+		wxCaret* caret = GetCaret();
+		if (caret) caret->Hide();
+	}
 }
 
-void SymbolPartList::onLabelEdit(wxListEvent& ev){
-	symbol->actions.add(
-		new SymbolPartNameAction(getPart(ev.GetIndex()), ev.GetLabel())
-	);
+void SymbolPartList::drawItem(DC& dc, int x, int& i, bool parent_active, const SymbolPartP& part) {
+	wxSize size = GetClientSize();
+	int w = size.x - x;
+	int y = i * (ITEM_HEIGHT + 1);
+	// draw item : highlight
+	Color background;
+	dc.SetPen(*wxTRANSPARENT_PEN);
+	bool active = selection.find(part) != selection.end();
+	if (active) {
+		background = wxSystemSettings::GetColour(wxSYS_COLOUR_HIGHLIGHT);
+		dc.SetBrush(background);
+		dc.DrawRectangle(x,y,w,ITEM_HEIGHT);
+		dc.SetTextForeground(wxSystemSettings::GetColour(wxSYS_COLOUR_HIGHLIGHTTEXT));
+	} else if (parent_active) {
+		background = wxSystemSettings::GetColour(wxSYS_COLOUR_HIGHLIGHT);
+		dc.SetTextForeground(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT));
+	} else {
+		background = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW);
+		dc.SetTextForeground(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT));
+	}
+	// draw item : name
+	int h = dc.GetCharHeight();
+	dc.DrawText(part->name, ITEM_HEIGHT + x + 3, y + (ITEM_HEIGHT - h) / 2);
+	// draw item : icon
+	dc.SetBrush(lerp(background,wxColour(0,128,0),0.7));
+	dc.DrawRectangle(x,y,ITEM_HEIGHT,ITEM_HEIGHT);
+	dc.DrawBitmap(symbolPreview(),     x, y);
+	dc.DrawBitmap(itemPreview(i,part), x, y);
+	// draw item : border
+	wxPen line_pen = lerp(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW),
+	                      wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT),0.5);
+	dc.SetPen(line_pen);
+	dc.DrawLine(x+ITEM_HEIGHT, y, x+ITEM_HEIGHT, y + ITEM_HEIGHT + 1); // line after image
+	dc.DrawLine(x, y + ITEM_HEIGHT, size.x, y + ITEM_HEIGHT); // line below
+	// update caret
+	if (selection.size() == 1 && active) {
+		updateCaret(dc, x + ITEM_HEIGHT + 3, y + (ITEM_HEIGHT - h) / 2, h, part);
+	}
+	// move down
+	i += 1;
+	// draw more?
+	if (SymbolShape* s = part->isSymbolShape()) {
+		// combine state
+		state_icons.Draw(s->combine, dc, size.x - 10, y + 1);
+	} else if (SymbolSymmetry* s = part->isSymbolSymmetry()) {
+		// kind of symmetry
+		state_icons.Draw(s->kind, dc, size.x - 10, y + 1);
+		// TODO: show clip mode?
+	} else if (SymbolGroup* g = part->isSymbolGroup()) {
+		state_icons.Draw(SYMMETRY_REFLECTION + 1, dc, size.x - 10, y + 1);
+		FOR_EACH(p, g->parts) drawItem(dc, x + 5, i, active || parent_active, p);
+		// draw bar on the left
+		int new_y = i * (ITEM_HEIGHT + 1);
+		y += ITEM_HEIGHT+1;
+		if (y != new_y) {
+			dc.SetPen(line_pen);
+			dc.SetBrush(background);
+			dc.DrawRectangle(x-1,y-1,5+1,new_y-y+1);
+		}
+	} else {
+		throw "Unknown symbol part type";
+	}
 }
 
-void SymbolPartList::onSize(wxSizeEvent& ev) {
-	wxSize s = GetClientSize();
-	SetColumnWidth(0, s.GetWidth() - 2);
+const Image& SymbolPartList::itemPreview(int i, const SymbolPartP& part) {
+	if ((size_t)i >= part_previews.size()) part_previews.resize(i + 1);
+	Preview& p = part_previews[i];
+	if (!p.up_to_date) {
+		SolidFillSymbolFilter filter(*wxBLACK, Color(255,128,128));
+		// temporary symbol
+		SymbolP sym(new Symbol); sym->parts.push_back(part);
+		Image img;
+		if (SymbolShape* s = part->isSymbolShape()) {
+			if (s->combine == SYMBOL_COMBINE_SUBTRACT) {
+				// temporarily render using subtract instead, otherwise we don't see anything
+				s->combine = SYMBOL_COMBINE_BORDER;
+				img = render_symbol(sym, filter, 0.08, ITEM_HEIGHT * 4);
+				s->combine = SYMBOL_COMBINE_SUBTRACT;
+			} else {
+				img = render_symbol(sym, filter, 0.08, ITEM_HEIGHT * 4);
+			}
+		} else {
+			img = render_symbol(sym, filter, 0.08, ITEM_HEIGHT * 4);
+		}
+		resample(img, p.image);
+		p.up_to_date = true;
+	}
+	return p.image;
+}
+const Image& SymbolPartList::symbolPreview() {
+	if (!symbol_preview.up_to_date) {
+		SolidFillSymbolFilter filter(AColor(0,0,0,40), AColor(255,255,255,40));
+		Image img = render_symbol(symbol, filter, 0.06, ITEM_HEIGHT * 4);
+		resample(img, symbol_preview.image);
+		symbol_preview.up_to_date = true;
+	}
+	return symbol_preview.image;
 }
 
-void SymbolPartList::onDrag(wxMouseEvent& ev) {
-	if (!ev.Dragging() || selected == -1) return;
-	// reorder the list of parts
-	int flags;
-	long item = HitTest(ev.GetPosition(), flags);
-	if (flags & wxLIST_HITTEST_ONITEM) {
-		if (item > 0)                  EnsureVisible(item - 1);
-		if (item < GetItemCount() - 1) EnsureVisible(item + 1);
-		if (item != selected) {
-			// swap the two items
-			symbol->actions.add(new ReorderSymbolPartsAction(*symbol, item, selected));
-			selectItem(item); // deselect all other items, to prevent 'lassoing' them
-		}
+void SymbolPartList::updateCaret(DC& dc, int x, int y, int h, const SymbolPartP& part) {
+	// make caret
+	wxCaret* caret = GetCaret();
+	if (!caret) {
+		caret = new wxCaret(this, 1, h);
+		SetCaret(caret);
+	}
+	// move caret
+	if (typing_in != part) {
+		typing_in = part;
+		cursor = typing_in->name.size();
 	}
+	cursor = min(cursor, typing_in->name.size());
+	int w;
+	dc.GetTextExtent(typing_in->name.substr(0,cursor), &w, nullptr);
+	caret->Move(x+w,y);
+	if (!caret->IsVisible()) caret->Show();
 }
 
 // ----------------------------------------------------------------------------- : Event table
 
-BEGIN_EVENT_TABLE(SymbolPartList, wxListCtrl)
-	EVT_LIST_ITEM_SELECTED   (wxID_ANY,	SymbolPartList::onSelect)
-	EVT_LIST_ITEM_DESELECTED (wxID_ANY,	SymbolPartList::onDeselect)
-	EVT_LIST_END_LABEL_EDIT  (wxID_ANY,	SymbolPartList::onLabelEdit)
-	EVT_SIZE                 (			SymbolPartList::onSize)
-	EVT_MOTION               (			SymbolPartList::onDrag)
+BEGIN_EVENT_TABLE(SymbolPartList, wxScrolledWindow)
+	EVT_LEFT_DOWN      (SymbolPartList::onLeftDown)
+	EVT_LEFT_DCLICK    (SymbolPartList::onLeftDClick)
+	EVT_LEFT_UP        (SymbolPartList::onLeftUp)
+	EVT_MOTION         (SymbolPartList::onMotion)
+	EVT_CHAR           (SymbolPartList::onChar)
+	EVT_PAINT          (SymbolPartList::onPaint)
+	EVT_SIZE           (SymbolPartList::onSize)
 END_EVENT_TABLE  ()

src/gui/symbol/part_list.hpp

@@ -11,61 +11,80 @@
 
 #include <util/prec.hpp>
 #include <data/symbol.hpp>
-#include <wx/listctrl.h>
+
+// ----------------------------------------------------------------------------- : Events
+
+DECLARE_EVENT_TYPE(EVENT_PART_SELECT,   <not used>)
+DECLARE_EVENT_TYPE(EVENT_PART_ACTIVATE, <not used>)
+
+/// Handle EVENT_PART_SELECT events
+#define EVT_PART_SELECT(  id, handler) EVT_COMMAND(id, EVENT_PART_SELECT,   handler)
+/// Handle EVENT_PART_ACTIVATE events
+#define EVT_PART_ACTIVATE(id, handler) EVT_COMMAND(id, EVENT_PART_ACTIVATE, handler)
 
 // ----------------------------------------------------------------------------- : SymbolPartList
 
-// A list view of parts of a symbol
-class SymbolPartList : public wxListCtrl, public SymbolView {
+class SymbolPartList : public wxScrolledWindow, public SymbolView {
   public:
-	SymbolPartList(Window* parent, int id, SymbolP symbol = SymbolP());
-	
-	/// Update the list
-	void update();
-	
-	/// Is there a selection?
-	inline bool hasSelection() const { return selected != -1; }
-	/// Return the last part that was selected
-	/** @pre hasSelection()
-	 */
-	inline SymbolPartP getSelection() const { return getPart(selected); }
-	
-	/// Get a set of selected parts
-	void getSelectedParts(set<SymbolPartP>& sel);
-	/// Select the specified parts, and nothing else
-	void selectParts(const set<SymbolPartP>& sel);
+	SymbolPartList(Window* parent, int id, set<SymbolPartP>& selection, SymbolP symbol = SymbolP());
 	
 	/// Another symbol is being viewed
-	void onChangeSymbol();
-	
+	virtual void onChangeSymbol();
 	/// Event handler for changes to the symbol
-	virtual void onAction(const Action& a, bool undone);
+	virtual void onAction(const Action&, bool);
 	
-  protected:
-	/// Get the text of an item
-	virtual String OnGetItemText(long item, long col) const;
-	/// Get the icon of an item
-	virtual int OnGetItemImage(long item) const;
+	/// Update the control
+	void update();
+	/// Update only a subset of the parts
+	void updateParts(const set<SymbolPartP>& parts);
 	
+  protected:
+	virtual wxSize DoGetBestSize() const;
   private:
-	/// The selected item, or -1 if there is no selection
-	long selected;
+	set<SymbolPartP>& selection; ///< Store selection here
 	
-	/// Get a part from the symbol
-	SymbolPartP getPart(long item) const;
+	SymbolPartP mouse_down_on;
+	int drop_position;
+	int number_of_items;
 	
-	/// Select an item, also in the list control
-	/// Deselects all other items
-	void selectItem(long item);
+	SymbolPartP typing_in;
+	size_t cursor;
 	
+	wxImageList state_icons;
+	struct Preview {
+		Preview() : up_to_date(false), image(25,25) {}
+		bool  up_to_date;
+		Image image;
+	};
+	Preview symbol_preview; ///< Preview of the whole symbol
+	vector<Preview> part_previews;
+	
+	static const int ITEM_HEIGHT = 25;
 	// --------------------------------------------------- : Event handling
 	DECLARE_EVENT_TABLE();
 	
-	void onSelect   (wxListEvent& ev);
-	void onDeselect (wxListEvent& ev);
-	void onLabelEdit(wxListEvent& ev);
-	void onSize     (wxSizeEvent& ev);
-	void onDrag     (wxMouseEvent& ev);
+	void onLeftDown  (wxMouseEvent& ev);
+	void onLeftDClick(wxMouseEvent& ev);
+	void onLeftUp    (wxMouseEvent& ev);
+	void onMotion    (wxMouseEvent& ev);
+	void onChar(wxKeyEvent& ev);
+	void onPaint(wxPaintEvent&);
+	void onSize(wxSizeEvent&);
+	void OnDraw(DC& dc);
+	
+	void sendEvent(int type);
+	
+	void drawItem(DC& dc, int x, int& i, bool parent_active, const SymbolPartP& part);
+	const Image& itemPreview(int i, const SymbolPartP& part);
+	const Image& symbolPreview();
+	void updatePart(const set<SymbolPartP>& parts, int& i, bool parent_updated, const SymbolPartP& part);
+	
+	SymbolPartP findItem(int i) const;
+	static SymbolPartP findItem(int& i, const SymbolPartP& part);
+	
+	static int childCount(const SymbolPartP& part);
+	
+	void updateCaret(DC& dc, int x, int y, int h, const SymbolPartP& part);
 };
 
 // ----------------------------------------------------------------------------- : EOF

src/gui/symbol/select_editor.cpp

@@ -37,11 +37,7 @@ SymbolSelectEditor::SymbolSelectEditor(SymbolControl* control, bool rotate)
 	handleShearY = wxBitmap(rotate_image(shear,90));
 	handleCenter = wxBitmap(load_resource_image(_("handle_center")));
 	// Make sure all parts have updated bounds
-	FOR_EACH(p, getSymbol()->parts) {
-		if (SymbolShape* s = p->isSymbolShape()) {
-			s->calculateBounds();
-		}
-	}
+	getSymbol()->calculateBounds();
 	resetActions();
 }
 
@@ -132,24 +128,32 @@ void SymbolSelectEditor::destroyUI(wxToolBar* tb, wxMenuBar* mb) {
 
 void SymbolSelectEditor::onUpdateUI(wxUpdateUIEvent& ev) {
 	if (ev.GetId() >= ID_SYMBOL_COMBINE && ev.GetId() < ID_SYMBOL_COMBINE_MAX) {
-		if (control.selected_parts.empty()) {
-			ev.Check(false);
-			ev.Enable(false);
-		} else {
-			ev.Enable(true);
-			bool check = true;
-			FOR_EACH(p, control.selected_parts) {
-				if (SymbolShape* s = p->isSymbolShape()) {
-					if (s->combine != ev.GetId() - ID_SYMBOL_COMBINE) {
-						check = false;
-						break;
-					}
-				} // disable when symmetries are selected?
-			}
-			ev.Check(check);
+		bool enable = false;
+		bool check = true;
+		FOR_EACH(p, control.selected_parts) {
+			if (SymbolShape* s = p->isSymbolShape()) {
+				enable = true;
+				if (s->combine != ev.GetId() - ID_SYMBOL_COMBINE) {
+					check = false;
+					break;
+				}
+			} // disable when symmetries are selected?
 		}
+		ev.Enable(enable);
+		ev.Check(enable && check);
 	} else if (ev.GetId() == ID_EDIT_DUPLICATE) {
 		ev.Enable(!control.selected_parts.empty());
+	} else if (ev.GetId() == ID_EDIT_GROUP) {
+		ev.Enable(control.selected_parts.size() >= 2);
+	} else if (ev.GetId() == ID_EDIT_UNGROUP) {
+		// is a group selected
+		FOR_EACH(p, control.selected_parts) {
+			if (p->isSymbolGroup()) {
+				ev.Enable(true);
+				return;
+			}
+		}
+		ev.Enable(false);
 	} else {
 		ev.Enable(false); // we don't know about this item
 	}
@@ -165,10 +169,15 @@ void SymbolSelectEditor::onCommand(int id) {
 		control.Refresh(false);
 	} else if (id == ID_EDIT_DUPLICATE && !isEditing()) {
 		// duplicate selection, not when dragging
-		DuplicateSymbolPartsAction* action = new DuplicateSymbolPartsAction(
-				*getSymbol(), control.selected_parts
-			);
-		getSymbol()->actions.add(action);
+		getSymbol()->actions.add(new DuplicateSymbolPartsAction(*getSymbol(), control.selected_parts));
+		control.Refresh(false);
+	} else if (id == ID_EDIT_GROUP && !isEditing()) {
+		// group selection, not when dragging
+		getSymbol()->actions.add(new GroupSymbolPartsAction(*getSymbol(), control.selected_parts));
+		control.Refresh(false);
+	} else if (id == ID_EDIT_UNGROUP && !isEditing()) {
+		// ungroup selection, not when dragging
+		getSymbol()->actions.add(new UngroupSymbolPartsAction(*getSymbol(), control.selected_parts));
 		control.Refresh(false);
 	}
 }
@@ -383,6 +392,7 @@ void SymbolSelectEditor::onChar(wxKeyEvent& ev) {
 	if (ev.GetKeyCode() == WXK_DELETE) {
 		// delete selected parts
 		getSymbol()->actions.add(new RemoveSymbolPartsAction(*getSymbol(), control.selected_parts));
+		if (control.selected_parts.find(highlightPart) != control.selected_parts.end()) highlightPart = SymbolPartP(); // deleted it
 		control.selected_parts.clear();
 		resetActions();
 		control.Refresh(false);
@@ -441,15 +451,25 @@ double SymbolSelectEditor::angleTo(const Vector2D& pos) {
 }
 
 
+SymbolPartP find_part(const SymbolPartP& part, const Vector2D& pos) {
+	if (SymbolShape* s = part->isSymbolShape()) {
+		if (point_in_shape(pos, *s)) return part;
+	} else if (SymbolSymmetry* s = part->isSymbolSymmetry()) {
+		// TODO
+	} else if (SymbolGroup* g = part->isSymbolGroup()) {
+		FOR_EACH(p, g->parts) {
+			if (find_part(p,pos)) return part;
+		}
+	} else {
+		throw InternalError(_("Invalid symbol part type"));
+	}
+	return SymbolPartP();
+}
+
 SymbolPartP SymbolSelectEditor::findPart(const Vector2D& pos) {
 	FOR_EACH(p, getSymbol()->parts) {
-		if (SymbolShape* s = p->isSymbolShape()) {
-			if (point_in_shape(pos, *s)) return p;
-		} else if (SymbolSymmetry* s = p->isSymbolSymmetry()) {
-			// TODO
-		} else {
-			throw InternalError(_("Invalid symbol part type"));
-		}
+		SymbolPartP found = find_part(p, pos);
+		if (found) return found;
 	}
 	return SymbolPartP();
 }
@@ -459,10 +479,8 @@ void SymbolSelectEditor::updateBoundingBox() {
 	minV =  Vector2D::infinity();
 	maxV = -Vector2D::infinity();
 	FOR_EACH(p, control.selected_parts) {
-		if (SymbolShape* s = p->isSymbolShape()) {
-			minV = piecewise_min(minV, s->min_pos);
-			maxV = piecewise_max(maxV, s->max_pos);
-		}
+		minV = piecewise_min(minV, p->min_pos);
+		maxV = piecewise_max(maxV, p->max_pos);
 	}
 /*	// Find rotation center
 	center = Vector2D(0,0);

src/gui/symbol/window.cpp

@@ -74,6 +74,9 @@ void SymbolWindow::init(Window* parent, SymbolP symbol) {
 		menuEdit->Append(ID_EDIT_UNDO,		_("undo"),			_MENU_1_("undo",wxEmptyString),	_HELP_("undo"));
 		menuEdit->Append(ID_EDIT_REDO,		_("redo"),			_MENU_1_("redo",wxEmptyString),	_HELP_("redo"));
 		menuEdit->AppendSeparator();
+		menuEdit->Append(ID_EDIT_GROUP,		_("group"),			_MENU_("group"),				_HELP_("group"));
+		menuEdit->Append(ID_EDIT_UNGROUP,	_("ungroup"),		_MENU_("ungroup"),				_HELP_("ungroup"));
+		menuEdit->AppendSeparator();
 		menuEdit->Append(ID_EDIT_DUPLICATE,	_("duplicate"),		_MENU_("duplicate"),			_HELP_("duplicate"));
 	menuBar->Append(menuEdit, _MENU_("edit"));
 	
@@ -82,6 +85,7 @@ void SymbolWindow::init(Window* parent, SymbolP symbol) {
 		menuTool->Append(ID_MODE_ROTATE,	_("mode_rotate"),	_MENU_("rotate"),				_HELP_("rotate"),		wxITEM_CHECK);
 		menuTool->Append(ID_MODE_POINTS,	_("mode_curve"),	_MENU_("points"),				_HELP_("points"),		wxITEM_CHECK);
 		menuTool->Append(ID_MODE_SHAPES,	_("circle"),		_MENU_("basic shapes"),			_HELP_("basic shapes"),	wxITEM_CHECK);
+		menuTool->Append(ID_MODE_SYMMETRY,	_("mode_symmetry"),	_MENU_("symmetry"),				_HELP_("symmetry"),		wxITEM_CHECK);
 		menuTool->Append(ID_MODE_PAINT,		_("mode_paint"),	_MENU_("paint"),				_HELP_("paint"),		wxITEM_CHECK);
 	menuBar->Append(menuTool, _MENU_("tool"));
 	
@@ -118,11 +122,11 @@ void SymbolWindow::init(Window* parent, SymbolP symbol) {
 	
 	// Controls
 	control = new SymbolControl (this, ID_CONTROL, symbol);
-	parts   = new SymbolPartList(this, ID_PART_LIST, symbol);
+	parts   = new SymbolPartList(this, ID_PART_LIST, control->selected_parts, symbol);
 	
 	// Lay out
 	wxSizer* es = new wxBoxSizer(wxHORIZONTAL);
-	es->Add(em, 0, wxEXPAND | wxTOP | wxBOTTOM | wxALIGN_CENTER, 1);
+	es->Add(em, 1, wxEXPAND | wxTOP | wxBOTTOM | wxALIGN_CENTER, 1);
 	emp->SetSizer(es);
 	
 	wxSizer* s = new wxBoxSizer(wxHORIZONTAL);
@@ -246,21 +250,21 @@ void SymbolWindow::onUpdateUI(wxUpdateUIEvent& ev) {
 }
 
 
-void SymbolWindow::onSelectFromList(wxListEvent& ev) {
+void SymbolWindow::onSelectFromList(wxCommandEvent& ev) {
 	if (inSelectionEvent) return ;
 	inSelectionEvent = true;
-	parts->getSelectedParts(control->selected_parts);
 	control->onUpdateSelection();
 	inSelectionEvent = false;
 }
-void SymbolWindow::onActivateFromList(wxListEvent& ev) {
-	control->activatePart(control->getSymbol()->parts.at(ev.GetIndex()));
+void SymbolWindow::onActivateFromList(wxCommandEvent& ev) {
+//%	control->activatePart(control->getSymbol()->parts.at(ev.GetIndex()));
+	// TODO
 }
 
 void SymbolWindow::onSelectFromControl() {
 	if (inSelectionEvent) return ;
 	inSelectionEvent = true;
-	parts->selectParts(control->selected_parts);
+	parts->Refresh(false);
 	inSelectionEvent = false;
 }
 
@@ -280,7 +284,6 @@ BEGIN_EVENT_TABLE(SymbolWindow, wxFrame)
 	EVT_TOOL_RANGE	(ID_CHILD_MIN, ID_CHILD_MAX,	SymbolWindow::onExtraTool)
 	EVT_UPDATE_UI	(wxID_ANY,						SymbolWindow::onUpdateUI)
 
-	EVT_LIST_ITEM_SELECTED   (ID_PART_LIST, SymbolWindow::onSelectFromList)
-	EVT_LIST_ITEM_DESELECTED (ID_PART_LIST, SymbolWindow::onSelectFromList)
-	EVT_LIST_ITEM_ACTIVATED  (ID_PART_LIST, SymbolWindow::onActivateFromList)
+	EVT_PART_SELECT   (ID_PART_LIST, SymbolWindow::onSelectFromList)
+	EVT_PART_ACTIVATE (ID_PART_LIST, SymbolWindow::onActivateFromList)
 END_EVENT_TABLE  ()

src/gui/symbol/window.hpp

@@ -14,6 +14,7 @@
 #include <wx/listctrl.h>
 
 class SymbolControl;
+//%%class SymbolPartList;
 class SymbolPartList;
 DECLARE_POINTER_TYPE(SymbolValue);
 DECLARE_POINTER_TYPE(Set);
@@ -62,9 +63,9 @@ class SymbolWindow : public Frame {
 	void onUpdateUI(wxUpdateUIEvent&);
 	
 	/// Changing selected parts in the list
-	void onSelectFromList(wxListEvent& ev);
+	void onSelectFromList(wxCommandEvent& ev);
 	/// Activating a part: open the point editor
-	void onActivateFromList(wxListEvent& ev);
+	void onActivateFromList(wxCommandEvent& ev);
 	
 	bool inSelectionEvent; ///< Prevent recursion in onSelect...
 	

src/main.cpp

@@ -96,6 +96,10 @@ bool MSE::OnInit() {
 					// Installer; install it
 					Installer::installFrom(argv[1], true);
 					return false;
+				} else if (arg == _("--symbol-editor")) {
+					Window* wnd = new SymbolWindow(nullptr);
+					wnd->Show();
+					return true;
 				} else if (arg == _("--create-installer")) {
 					// create an installer
 					Installer inst;

src/render/symbol/filter.cpp

@@ -12,6 +12,29 @@
 #include <util/error.hpp>
 #include <script/value.hpp> // for some strange reason the profile build needs this :(
 
+// ----------------------------------------------------------------------------- : Color
+
+template <> void GetDefaultMember::handle(const AColor& col) {
+	handle((const Color&)col);
+}
+template <> void Reader::handle(AColor& col) {
+	UInt r,g,b,a;
+	if (wxSscanf(getValue().c_str(),_("rgb(%u,%u,%u)"),&r,&g,&b)) {
+		col.Set(r,g,b);
+		col.alpha = 255;
+	} else if (wxSscanf(getValue().c_str(),_("rgba(%u,%u,%u,%u)"),&r,&g,&b,&a)) {
+		col.Set(r,g,b);
+		col.alpha = a;
+	}
+}
+template <> void Writer::handle(const AColor& col) {
+	if (col.alpha == 255) {
+		handle(String::Format(_("rgb(%u,%u,%u)"), col.Red(), col.Green(), col.Blue()));
+	} else {
+		handle(String::Format(_("rgba(%u,%u,%u,%u)"), col.Red(), col.Green(), col.Blue(), col.alpha));
+	}
+}
+
 // ----------------------------------------------------------------------------- : Symbol filtering
 
 void filter_symbol(Image& symbol, const SymbolFilter& filter) {

src/render/symbol/filter.hpp

@@ -20,9 +20,10 @@ class SymbolFilter;
 /// Color with alpha channel
 class AColor : public Color {
   public:
-	int alpha;	///< The alpha value, in the range [0..255]
-	inline AColor(int r, int g, int b, int a = 255) : Color(r,g,b), alpha(a) {}
-	inline AColor(const Color& color,  int a = 255) : Color(color), alpha(a) {}
+	Byte alpha;	///< The alpha value, in the range [0..255]
+	inline AColor()                                     :               alpha(0) {}
+	inline AColor(Byte r, Byte g, Byte b, Byte a = 255) : Color(r,g,b), alpha(a) {}
+	inline AColor(const Color& color,     Byte a = 255) : Color(color), alpha(a) {}
 };
 
 // ----------------------------------------------------------------------------- : Symbol filtering
@@ -69,14 +70,14 @@ intrusive_ptr<SymbolFilter> read_new<SymbolFilter>(Reader& reader);
 class SolidFillSymbolFilter : public SymbolFilter {
   public:
 	inline SolidFillSymbolFilter() {}
-	inline SolidFillSymbolFilter(Color fill_color, Color border_color)
+	inline SolidFillSymbolFilter(const AColor& fill_color, const AColor& border_color)
 		: fill_color(fill_color), border_color(border_color)
 	{}
 	virtual AColor color(double x, double y, SymbolSet point) const;
 	virtual String fillType() const;
 	virtual bool operator == (const SymbolFilter& that) const;
   private:
-	Color fill_color, border_color;
+	AColor fill_color, border_color;
 	DECLARE_REFLECTION();
 };
 

src/render/symbol/viewer.cpp

@@ -72,10 +72,8 @@ void SymbolViewer::draw(DC& dc) {
 			}
 		}
 	}
-	// Draw all parts, in reverse order (bottom to top)
-	FOR_EACH_REVERSE(p, symbol->parts) {
-		combineSymbolPart(dc, *p, paintedSomething, buffersFilled, borderDC, interiorDC);
-	}
+	// Draw all parts
+	combineSymbolPart(dc, *symbol, paintedSomething, buffersFilled, borderDC, interiorDC);
 	
 	// Output the final parts from the buffer
 	if (buffersFilled) {
@@ -118,7 +116,8 @@ void SymbolViewer::combineSymbolPart(DC& dc, const SymbolPart& part, bool& paint
 	} else if (const SymbolSymmetry* s = part.isSymbolSymmetry()) {
 		// symmetry, already handled above
 	} else if (const SymbolGroup* g = part.isSymbolGroup()) {
-		FOR_EACH_CONST(p, g->parts) {
+		// Draw all parts, in reverse order (bottom to top)
+		FOR_EACH_CONST_REVERSE(p, g->parts) {
 			combineSymbolPart(dc, *p, paintedSomething, buffersFilled, borderDC, interiorDC);
 		}
 	}
@@ -147,6 +146,10 @@ void SymbolViewer::highlightPart(DC& dc, const SymbolShape& shape, HighlightStyl
 		dc.SetBrush(*wxTRANSPARENT_BRUSH);
 		dc.SetPen  (wxPen(Color(255,0,0), 2));
 		dc.DrawPolygon((int)points.size(), &points[0]);
+	} else if (style == HIGHLIGHT_BORDER_DOT) {
+		dc.SetBrush(*wxTRANSPARENT_BRUSH);
+		dc.SetPen  (wxPen(Color(255,0,0), 1, wxDOT));
+		dc.DrawPolygon((int)points.size(), &points[0]);
 	} else {
 		dc.SetLogicalFunction(wxOR);
 		dc.SetBrush(Color(0,0,64));
@@ -164,8 +167,13 @@ void SymbolViewer::highlightPart(DC& dc, const SymbolSymmetry& sym) {
 	// TODO
 }
 void SymbolViewer::highlightPart(DC& dc, const SymbolGroup& group, HighlightStyle style) {
+	if (style == HIGHLIGHT_BORDER) {
+		dc.SetBrush(*wxTRANSPARENT_BRUSH);
+		dc.SetPen  (wxPen(Color(255,0,0), 2));
+		dc.DrawRectangle(rotation.tr(RealRect(group.min_pos, RealSize(group.max_pos - group.min_pos))));
+	}
 	FOR_EACH_CONST(part, group.parts) {
-		highlightPart(dc, *part, style);
+		highlightPart(dc, *part, (HighlightStyle)(style | HIGHLIGHT_LESS));
 	}
 }
 

src/render/symbol/viewer.hpp

@@ -21,9 +21,11 @@ Image render_symbol(const SymbolP& symbol, double border_radius = 0.05, int size
 
 // ----------------------------------------------------------------------------- : Symbol Viewer
 
-enum HighlightStyle {
-	HIGHLIGHT_BORDER,
-	HIGHLIGHT_INTERIOR
+enum HighlightStyle
+{	HIGHLIGHT_BORDER     = 0x01
+,	HIGHLIGHT_INTERIOR   = 0x02
+,	HIGHLIGHT_LESS       = 0x10
+,	HIGHLIGHT_BORDER_DOT = HIGHLIGHT_BORDER | HIGHLIGHT_LESS
 };
 
 /// Class that knows how to draw a symbol

src/resource/msw/mse.rc

@@ -87,10 +87,13 @@ tool/mode_select		IMAGE	"tool/mode_select.png"
 tool/mode_rotate		IMAGE	"tool/mode_rotate.png"
 tool/mode_curve			IMAGE	"tool/mode_curve.png"
 tool/mode_paint			IMAGE	"tool/mode_paint.png"
+tool/mode_symmetry		IMAGE	"tool/mode_symmetry.png"
 tool/apply				IMAGE	"tool/apply.png"
 tool/duplicate			IMAGE	"tool/duplicate.png"
 tool/grid				IMAGE	"tool/grid.png"
 tool/grid_snap			IMAGE	"tool/grid_snap.png"
+tool/group				IMAGE	"tool/group.png"
+tool/ungroup			IMAGE	"tool/ungroup.png"
 
 combine_or				IMAGE	"../common/combine_or.png"
 combine_sub				IMAGE	"../common/combine_sub.png"
@@ -102,6 +105,17 @@ combine_over			IMAGE	"../common/combine_over.png"
 combine_border			IMAGE	"../common/combine_border.png"
 symmetry_rotation		IMAGE	"../common/symmetry_rotation.png"
 symmetry_reflection		IMAGE	"../common/symmetry_reflection.png"
+symbol_group			IMAGE	"../common/symbol_group.png"
+
+icon_combine_merge			IMAGE	"../common/icon_combine_merge.png"
+icon_combine_subtract		IMAGE	"../common/icon_combine_subtract.png"
+icon_combine_intersection	IMAGE	"../common/icon_combine_intersection.png"
+icon_combine_difference		IMAGE	"../common/icon_combine_difference.png"
+icon_combine_overlap		IMAGE	"../common/icon_combine_overlap.png"
+icon_combine_border			IMAGE	"../common/icon_combine_border.png"
+icon_symmetry_rotation		IMAGE	"../common/icon_symmetry_rotation.png"
+icon_symmetry_reflection	IMAGE	"../common/icon_symmetry_reflection.png"
+icon_symbol_group			IMAGE	"../common/icon_symbol_group.png"
 
 handle_rotate			IMAGE	"../common/handle_rotate.png"
 handle_shear_x			IMAGE	"../common/handle_shear_x.png"

src/util/real_point.hpp

@@ -37,7 +37,14 @@ class RealSize {
 		: width(w), height(h)
 	{}
 	inline RealSize(wxSize s)
-		: width(s.GetWidth()), height(s.GetHeight())
+		: width(s.x), height(s.y)
+	{}
+	inline explicit RealSize(const Vector2D& v)
+		: width(v.x), height(v.y)
+	{}
+	/// size of an image
+	inline explicit RealSize(const wxImage& img)
+		: width(img.GetWidth()), height(img.GetHeight())
 	{}
 	
 	/// Negation of a size, negates both components

src/util/vector2d.hpp

@@ -74,15 +74,6 @@ class Vector2D {
 		x /= r;  y /= r;
 	}
 	
-	/// Inner product with another vector
-	inline double dot(Vector2D p2) const {
-		return (x * p2.x) + (y * p2.y);
-	}
-	/// Outer product with another vector
-	inline double cross(Vector2D p2) const {
-		return (x * p2.y) - (y * p2.x);
-	}
-	
 	/// Piecewise multiplication
 	inline Vector2D mul(Vector2D p2) {
 		return Vector2D(x * p2.x, y * p2.y);
@@ -91,12 +82,7 @@ class Vector2D {
 	inline Vector2D div(Vector2D p2) {
 		return Vector2D(x / p2.x, y / p2.y);
 	}
-	
-	/// Apply a 'matrix' to this vector
-	inline Vector2D mul(Vector2D mx, Vector2D my) {
-		return Vector2D(dot(mx), dot(my));
-	}
-	
+		
 	/// Returns the square of the length of this vector
 	inline double lengthSqr() const {
 		return x*x + y*y;
@@ -106,7 +92,7 @@ class Vector2D {
 		return sqrt(lengthSqr());
 	}
 	/// Returns a normalized version of this vector
-	/// i.e. length() == 1
+	/** i.e. length() == 1 */
 	inline Vector2D normalized() const {
 		return *this / length();
 	}
@@ -122,6 +108,15 @@ class Vector2D {
 	}
 };
 
+/// Inner product of two vectors
+inline double dot(const Vector2D& a, const Vector2D& b) {
+	return (a.x * b.x) + (a.y * b.y);
+}
+/// Length of the outer product of two vectors
+inline double cross(const Vector2D& a, const Vector2D& b) {
+	return (a.x * b.y) - (a.y * b.x);
+}
+
 /// Piecewise minimum
 inline Vector2D piecewise_min(const Vector2D& a, const Vector2D& b) {
 	return Vector2D(
@@ -140,6 +135,23 @@ inline Vector2D piecewise_max(const Vector2D& a, const Vector2D& b) {
 
 inline Vector2D operator * (double a, const Vector2D& b) { return b * a; }
 
+// ----------------------------------------------------------------------------- : Matrix2D
+
+/// A two dimensional transformation matrix, simply two vectors
+class Matrix2D {
+  public:
+	Vector2D mx, my;
+	
+	inline Matrix2D() {}
+	inline Matrix2D(const Vector2D& mx, const Vector2D& my) : mx(mx),  my(my)  {}
+	inline Matrix2D(double a, double b, double c, double d) : mx(a,b), my(c,d) {}
+};
+
+/// vector-matrix product
+inline Vector2D operator * (const Vector2D& a, const Matrix2D& m) {
+	return Vector2D(dot(a,m.mx), dot(a,m.my));
+}
+
 
 // ----------------------------------------------------------------------------- : EOF
 #endif

src/util/window_id.hpp

@@ -76,6 +76,7 @@ enum MenuID {
 ,	ID_MODE_ROTATE
 ,	ID_MODE_POINTS
 ,	ID_MODE_SHAPES
+,	ID_MODE_SYMMETRY
 ,	ID_MODE_PAINT
 ,	ID_MODE_MAX
 };