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 /* This file is part of the KDE project
  * Copyright (C) 2008-2009 Jan Hambrecht <jaham@gmx.net>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library 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
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef KOPATHSEGMENT_H
 #define KOPATHSEGMENT_H
 
 #include "flake_export.h"
 #include <QList>
 #include <QPair>
 
 class KoPathPoint;
 class QTransform;
 class QPointF;
 class QRectF;
 
 /// A KoPathSegment consist of two neighboring KoPathPoints
 class FLAKE_EXPORT KoPathSegment
 {
 public:
     /**
     * Creates a new segment from the given path points
     * It takes ownership of the path points which do not have a
     * parent path shape set.
     */
     explicit KoPathSegment(KoPathPoint * first = 0, KoPathPoint * second = 0);
 
     /// Constructs segment by copying another segment
     KoPathSegment(const KoPathSegment &segment);
 
     /// Creates a new line segment
     KoPathSegment(const QPointF &p0, const QPointF &p1);
     /// Creates a new quadratic segment
     KoPathSegment(const QPointF &p0, const QPointF &p1, const QPointF &p2);
     /// Creates a new cubic segment
     KoPathSegment(const QPointF &p0, const QPointF &p1, const QPointF &p2, const QPointF &p3);
 
     /// Assigns segment
     KoPathSegment& operator=(const KoPathSegment &other);
 
     /// Destroys the path segment
     ~KoPathSegment();
 
     /// Returns the first point of the segment
     KoPathPoint *first() const;
 
     /// Sets the first segment point
     void setFirst(KoPathPoint *first);
 
     /// Returns the second point of the segment
     KoPathPoint *second() const;
 
     /// Sets the second segment point
     void setSecond(KoPathPoint *second);
 
     /// Returns if segment is valid, e.g. has two valid points
     bool isValid() const;
 
     /// Compare operator
     bool operator==(const KoPathSegment &other) const;
 
     /// Returns the degree of the segment: 1 = line, 2 = quadratic, 3 = cubic, -1 = invalid
     int degree() const;
 
     /// Returns list of intersections with the given path segment
     QVector<QPointF> intersections(const KoPathSegment &segment) const;
 
     /// Returns the convex hull polygon of the segment
     QVector<QPointF> convexHull() const;
 
     /// Splits segment at given position returning the two resulting segments
     QPair<KoPathSegment, KoPathSegment> splitAt(qreal t) const;
 
     /// Returns point at given t
     QPointF pointAt(qreal t) const;
 
     /// Returns the axis aligned tight bounding rect
     QRectF boundingRect() const;
 
     /// Returns the control point bounding rect
     QRectF controlPointRect() const;
 
     /// Returns transformed segment
     KoPathSegment mapped(const QTransform &matrix) const;
 
     /// Returns cubic bezier curve segment of this segment
     KoPathSegment toCubic() const;
 
     /**
      * Returns the length of the path segment
      * @param error the error tolerance
      */
     qreal length(qreal error = 0.005) const;
 
     /**
      * Returns segment length at given parameter
      *
      * Splits the segment at the given parameter t and calculates
      * the length of the first segment of the split.
      *
      * @param t curve parameter to get length at
      * @param error the error tolerance
      */
     qreal lengthAt(qreal t, qreal error = 0.005) const;
 
     /**
      * Returns the curve parameter at the given length of the segment
      *
      * If the specified length is negative it returns 0.0.
      * If the specified length is bigger that the actual length of the
      * segment it return 1.0.
      *
      * @param length the length to get the curve parameter for
      * @param tolerance the length error tolerance
      */
     qreal paramAtLength(qreal length, qreal tolerance = 0.001) const;
 
     /**
      * Checks if the segment is flat, i.e. the height smaller then the given tolerance
      * @param tolerance the flatness tolerance
      */
     bool isFlat(qreal tolerance = 0.01) const;
 
     /**
      * Returns the parameter for the curve point nearest to the given point
      * @param point the point to find nearest point to
      * @return the parameter of the curve point nearest to the given point
      */
     qreal nearestPoint(const QPointF &point) const;
 
     /// Returns ordered list of control points
     QVector<QPointF> controlPoints() const;
 
     /**
      * Interpolates quadric bezier curve.
      * @return the interpolated bezier segment
      */
     static KoPathSegment interpolate(const QPointF &p0, const QPointF &p1, const QPointF &p2, qreal t);
 
 private:
     class Private;
     Private * const d;
 };
 
 #endif // KOPATHSEGMENT_H