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diff --git a/pcbnew/tools/edit_constraints.h b/pcbnew/tools/edit_constraints.h
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+/*
+ * This program source code file is part of KICAD, a free EDA CAD application.
+ *
+ * Copyright (C) 2014 CERN
+ * @author Maciej Suminski <maciej.suminski@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 2
+ * 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, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef EDIT_CONSTRAINTS_H_
+#define EDIT_CONSTRAINTS_H_
+
+#include <math/vector2d.h>
+#include <boost/function.hpp>
+
+class EDIT_POINT;
+class EDIT_LINE;
+class EDIT_POINTS;
+
+/**
+ * Class EDIT_CONSTRAINT
+ *
+ * Allows to describe constraints between two edit handles. After the constrained handle is changed,
+ * Apply() has to be called to fix its coordinates according to the implemented constraint.
+ */
+template<class EDIT_TYPE>
+class EDIT_CONSTRAINT
+{
+public:
+    /**
+     * Constructor
+     *
+     * @param aConstrained is EDIT_POINT to which the constraint is applied.
+     */
+    EDIT_CONSTRAINT( EDIT_TYPE& aConstrained ) : m_constrained( aConstrained ) {};
+
+    virtual ~EDIT_CONSTRAINT() {};
+
+    /**
+     * Function Apply()
+     *
+     * Corrects coordinates of the constrained edit handle.
+     */
+    virtual void Apply( EDIT_TYPE& aHandle ) = 0;
+
+    /**
+     * Function Apply()
+     *
+     * Corrects coordinates of the constrained edit handle.
+     */
+    void Apply()
+    {
+        Apply( m_constrained );
+    }
+
+protected:
+    EDIT_TYPE& m_constrained;      ///< Point that is constrained by rules implemented by Apply()
+};
+
+
+/**
+ * Class EC_VERTICAL.
+ *
+ * EDIT_CONSTRAINT that imposes a constraint that two points have to have the same X coordinate.
+ */
+class EC_VERTICAL : public EDIT_CONSTRAINT<EDIT_POINT>
+{
+public:
+    /**
+     * Constructor.
+     *
+     * @param aConstrained is the point that is put under constrain.
+     * @param aConstrainer is the point that is the source of the constrain.
+     */
+    EC_VERTICAL( EDIT_POINT& aConstrained, const EDIT_POINT& aConstrainer ) :
+        EDIT_CONSTRAINT<EDIT_POINT>( aConstrained ), m_constrainer( aConstrainer )
+    {}
+
+    ///> @copydoc EDIT_CONSTRAINT::Apply()
+    virtual void Apply( EDIT_POINT& aHandle );
+
+private:
+    const EDIT_POINT& m_constrainer;      ///< Point that imposes the constraint.
+};
+
+
+/**
+ * Class EC_HORIZONTAL.
+ *
+ * EDIT_CONSTRAINT that imposes a constraint that two points have to have the same Y coordinate.
+ */
+class EC_HORIZONTAL : public EDIT_CONSTRAINT<EDIT_POINT>
+{
+public:
+    /**
+     * Constructor.
+     *
+     * @param aConstrained is the point that is put under constrain.
+     * @param aConstrainer is the point that is the source of the constrain.
+     */
+    EC_HORIZONTAL( EDIT_POINT& aConstrained, const EDIT_POINT& aConstrainer ) :
+        EDIT_CONSTRAINT<EDIT_POINT>( aConstrained ), m_constrainer( aConstrainer )
+    {}
+
+    ///> @copydoc EDIT_CONSTRAINT::Apply()
+    virtual void Apply( EDIT_POINT& aHandle );
+
+private:
+    const EDIT_POINT& m_constrainer;    ///< Point that imposes the constraint.
+};
+
+
+/**
+ * Class EC_45DEGREE
+ *
+ * EDIT_CONSTRAINT that imposes a constraint that two points have to be located at angle of 45
+ * degree multiplicity.
+ */
+class EC_45DEGREE : public EDIT_CONSTRAINT<EDIT_POINT>
+{
+public:
+    /**
+     * Constructor.
+     *
+     * @param aConstrained is the point that is put under constrain.
+     * @param aConstrainer is the point that is the source of the constrain.
+     */
+    EC_45DEGREE( EDIT_POINT& aConstrained, const EDIT_POINT& aConstrainer ) :
+        EDIT_CONSTRAINT<EDIT_POINT>( aConstrained ), m_constrainer( aConstrainer )
+    {}
+
+    ///> @copydoc EDIT_CONSTRAINT::Apply()
+    virtual void Apply( EDIT_POINT& aHandle );
+
+private:
+    const EDIT_POINT& m_constrainer;    ///< Point that imposes the constraint.
+};
+
+
+/**
+ * Class EC_LINE
+ *
+ * EDIT_CONSTRAINT that imposes a constraint that a point has to lie on a line (determined
+ * by 2 points).
+ */
+class EC_LINE : public EDIT_CONSTRAINT<EDIT_POINT>
+{
+public:
+    EC_LINE( EDIT_POINT& aConstrained, const EDIT_POINT& aConstrainer );
+
+    ///> @copydoc EDIT_CONSTRAINT::Apply()
+    virtual void Apply( EDIT_POINT& aHandle );
+
+private:
+    const EDIT_POINT& m_constrainer;    ///< Point that imposes the constraint.
+    VECTOR2I m_line;                    ///< Vector representing the constraining line.
+};
+
+
+/**
+ * Class EC_CIRCLE.
+ *
+ * EDIT_CONSTRAINT that imposes a constraint that a point has to lie on a circle.
+ */
+class EC_CIRCLE : public EDIT_CONSTRAINT<EDIT_POINT>
+{
+public:
+    /**
+     * Constructor.
+     *
+     * @param aConstrained is the point that is put under constrain.
+     * @param aCenter is the point that is the center of the circle.
+     * @param aEnd is the point that decides on the radius of the circle.
+     */
+    EC_CIRCLE( EDIT_POINT& aConstrained, const EDIT_POINT& aCenter, const EDIT_POINT& aEnd ) :
+        EDIT_CONSTRAINT<EDIT_POINT>( aConstrained ), m_center( aCenter ), m_end( aEnd )
+    {}
+
+    ///> @copydoc EDIT_CONSTRAINT::Apply()
+    virtual void Apply( EDIT_POINT& aHandle );
+
+private:
+    ///> Point that imposes the constraint (center of the circle).
+    const EDIT_POINT& m_center;
+
+    ///> Point that imposes the constraint (decides on the radius of the circle).
+    const EDIT_POINT& m_end;
+};
+
+
+/**
+ * Class EC_CONVERGING
+ *
+ * EDIT_CONSTRAINT for 3 segments: dragged and two adjacent ones, enforcing to keep their slopes
+ * and allows only to change ending points. Applied to zones.
+ */
+class EC_CONVERGING : public EDIT_CONSTRAINT<EDIT_LINE>
+{
+public:
+    EC_CONVERGING( EDIT_LINE& aLine, EDIT_POINTS& aPoints );
+
+    virtual ~EC_CONVERGING();
+
+    ///> @copydoc EDIT_CONSTRAINT::Apply()
+    virtual void Apply( EDIT_LINE& aHandle );
+
+private:
+    ///> Constraint for origin side segment.
+    EDIT_CONSTRAINT<EDIT_POINT>* m_originSideConstraint;
+
+    ///> Constraint for end side segment.
+    EDIT_CONSTRAINT<EDIT_POINT>* m_endSideConstraint;
+
+    ///> Additional constriant, applied when at least two points are collinear. It is a pointer to
+    ///> m_[origin/end]SideConstraint, so it should not be freed.
+    EDIT_CONSTRAINT<EDIT_POINT>* m_colinearConstraint;
+
+    ///> EDIT_POINTS instance that stores currently modified lines.
+    EDIT_POINTS& m_editPoints;
+
+    ///> Vector that represents the initial direction of the dragged segment.
+    VECTOR2I m_draggedVector;
+};
+
+
+/**
+ * Class EC_SNAPLINE
+ *
+ * EDIT_CONSTRAINT for a EDIT_LINE, one of the ends is snapped to a spot determined by a
+ * transform function passed as parameter (e.g. it can be snapped to a grid), instead of having
+ * the line center snapped to a point.
+ */
+class EC_SNAPLINE : public EDIT_CONSTRAINT<EDIT_LINE>
+{
+public:
+    ///> Typedef for a function that determines snapping point.
+    typedef boost::function<VECTOR2D (const VECTOR2D&)> V2D_TRANSFORM_FUN;
+
+    EC_SNAPLINE( EDIT_LINE& aLine, V2D_TRANSFORM_FUN aSnapFun );
+
+    virtual ~EC_SNAPLINE()
+    {}
+
+    ///> @copydoc EDIT_CONSTRAINT::Apply()
+    virtual void Apply( EDIT_LINE& aHandle );
+
+private:
+    ///> Function that determines snapping point.
+    V2D_TRANSFORM_FUN m_snapFun;
+};
+
+#endif /* EDIT_CONSTRAINTS_H_ */