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diff --git a/pcbnew/router/pns_placement_algo.h b/pcbnew/router/pns_placement_algo.h
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+++ b/pcbnew/router/pns_placement_algo.h
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+/*
+ * KiRouter - a push-and-(sometimes-)shove PCB router
+ *
+ * Copyright (C) 2013-2014 CERN
+ * Author: Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __PNS_PLACEMENT_ALGO_H
+#define __PNS_PLACEMENT_ALGO_H
+
+#include <math/vector2d.h>
+
+#include "pns_algo_base.h"
+#include "pns_sizes_settings.h"
+#include "pns_itemset.h"
+
+class PNS_ROUTER;
+class PNS_ITEM;
+class PNS_NODE;
+
+/**
+ * Class PNS_PLACEMENT_ALGO
+ *
+ * Abstract class for a P&S placement/dragging algorithm.
+ * All subtools (drag, single/diff pair routing and meandering)
+ * are derived from it.
+ */
+
+class PNS_PLACEMENT_ALGO : public PNS_ALGO_BASE
+{
+public:
+    PNS_PLACEMENT_ALGO( PNS_ROUTER* aRouter ) :
+        PNS_ALGO_BASE( aRouter ) {};
+
+    virtual ~PNS_PLACEMENT_ALGO () {};
+
+    /**
+     * Function Start()
+     *
+     * Starts placement/drag operation at point aP, taking item aStartItem as anchor
+     * (unless NULL).
+     */
+    virtual bool Start( const VECTOR2I& aP, PNS_ITEM* aStartItem ) = 0;
+
+    /**
+     * Function Move()
+     *
+     * Moves the end of the currently routed primtive(s) to the point aP, taking
+     * aEndItem as the anchor (if not NULL).
+     * (unless NULL).
+     */
+    virtual bool Move( const VECTOR2I& aP, PNS_ITEM* aEndItem ) = 0;
+
+    /**
+     * Function FixRoute()
+     *
+     * Commits the currently routed items to the parent node, taking
+     * aP as the final end point and aEndItem as the final anchor (if provided).
+     * @return true, if route has been commited. May return false if the routing
+     * result is violating design rules - in such case, the track is only committed
+     * if Settings.CanViolateDRC() is on.
+     */
+    virtual bool FixRoute( const VECTOR2I& aP, PNS_ITEM* aEndItem ) = 0;
+
+    /**
+     * Function ToggleVia()
+     *
+     * Enables/disables a via at the end of currently routed trace.
+     */
+    virtual bool ToggleVia( bool aEnabled )
+    {
+        return false;
+    }
+
+    /**
+     * Function IsPlacingVia()
+     *
+     * Returns true if the placer is placing a via (or more vias).
+     */
+    virtual bool IsPlacingVia() const
+    {
+        return false;
+    }
+
+    /**
+     * Function SetLayer()
+     *
+     * Sets the current routing layer.
+     */
+    virtual bool SetLayer( int aLayer )
+    {
+        return false;
+    }
+
+    /**
+     * Function Traces()
+     *
+     * Returns all routed/tuned traces.
+     */
+    virtual const PNS_ITEMSET Traces() = 0;
+
+    /**
+     * Function CurrentEnd()
+     *
+     * Returns the current end of the line(s) being placed/tuned. It may not be equal
+     * to the cursor position due to collisions.
+     */
+    virtual const VECTOR2I& CurrentEnd() const = 0;
+
+    /**
+     * Function CurrentNets()
+     *
+     * Returns the net code(s) of currently routed track(s).
+     */
+    virtual const std::vector<int> CurrentNets() const = 0;
+
+    /**
+     * Function CurrentLayer()
+     *
+     * Returns the layer of currently routed track.
+     */
+    virtual int CurrentLayer() const = 0;
+
+    /**
+     * Function CurrentNode()
+     *
+     * Returns the most recent board state.
+     */
+    virtual PNS_NODE* CurrentNode( bool aLoopsRemoved = false ) const = 0;
+
+    /**
+     * Function FlipPosture()
+     *
+     * Toggles the current posture (straight/diagonal) of the trace head.
+     */
+    virtual void FlipPosture()
+    {
+    }
+
+    /**
+     * Function UpdateSizes()
+     *
+     * Performs on-the-fly update of the width, via diameter & drill size from
+     * a settings class. Used to dynamically change these parameters as
+     * the track is routed.
+     */
+    virtual void UpdateSizes( const PNS_SIZES_SETTINGS& aSizes )
+    {
+    }
+
+    /**
+     * Function SetOrthoMode()
+     *
+     * Forces the router to place a straight 90/45 degree trace (with the end
+     * as near to the cursor as possible) instead of a standard 135 degree
+     * two-segment bend.
+     */
+    virtual void SetOrthoMode ( bool aOrthoMode )
+    {
+    }
+
+    /**
+     * Function GetModifiedNets
+     *
+     * Returns the net codes of all currently routed trace(s)
+     */
+    virtual void GetModifiedNets( std::vector<int> &aNets ) const
+    {
+    }
+};
+
+#endif