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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 KOSNAPSTRATEGY_H
#define KOSNAPSTRATEGY_H
#include "KoSnapGuide.h"
#include <QPointF>
#include <QPainterPath>
class TestSnapStrategy;
class KoPathPoint;
class KoSnapProxy;
class KoViewConverter;
class FLAKE_TEST_EXPORT KoSnapStrategy
{
public:
KoSnapStrategy(KoSnapGuide::Strategy type);
virtual ~KoSnapStrategy() {};
virtual bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance) = 0;
/// returns the strategies type
KoSnapGuide::Strategy type() const;
static qreal squareDistance(const QPointF &p1, const QPointF &p2);
static qreal scalarProduct(const QPointF &p1, const QPointF &p2);
/// returns the snapped position form the last call to snapToPoints
QPointF snappedPosition() const;
/// returns the current snap strategy decoration
virtual QPainterPath decoration(const KoViewConverter &converter) const = 0;
protected:
/// sets the current snapped position
void setSnappedPosition(const QPointF &position);
private:
KoSnapGuide::Strategy m_snapType;
QPointF m_snappedPosition;
};
/// snaps to x- or y-coordinates of path points
class FLAKE_TEST_EXPORT OrthogonalSnapStrategy : public KoSnapStrategy
{
public:
OrthogonalSnapStrategy();
virtual bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance);
virtual QPainterPath decoration(const KoViewConverter &converter) const;
private:
QLineF m_hLine;
QLineF m_vLine;
};
/// snaps to path points
class FLAKE_TEST_EXPORT NodeSnapStrategy : public KoSnapStrategy
{
public:
NodeSnapStrategy();
virtual bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance);
virtual QPainterPath decoration(const KoViewConverter &converter) const;
};
/// snaps extension lines of path shapes
class FLAKE_TEST_EXPORT ExtensionSnapStrategy : public KoSnapStrategy
{
friend class TestSnapStrategy;
public:
ExtensionSnapStrategy();
virtual bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance);
virtual QPainterPath decoration(const KoViewConverter &converter) const;
private:
qreal project(const QPointF &lineStart , const QPointF &lineEnd, const QPointF &point);
QPointF extensionDirection(KoPathPoint * point, const QTransform &matrix);
bool snapToExtension(QPointF &position, KoPathPoint * point, const QTransform &matrix);
QList<QLineF> m_lines;
};
/// snaps to intersections of shapes
class FLAKE_TEST_EXPORT IntersectionSnapStrategy : public KoSnapStrategy
{
public:
IntersectionSnapStrategy();
virtual bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance);
virtual QPainterPath decoration(const KoViewConverter &converter) const;
};
/// snaps to the canvas grid
class FLAKE_TEST_EXPORT GridSnapStrategy : public KoSnapStrategy
{
public:
GridSnapStrategy();
virtual bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance);
virtual QPainterPath decoration(const KoViewConverter &converter) const;
};
/// snaps to shape bounding boxes
class FLAKE_TEST_EXPORT BoundingBoxSnapStrategy : public KoSnapStrategy
{
friend class TestSnapStrategy;
public:
BoundingBoxSnapStrategy();
virtual bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance);
virtual QPainterPath decoration(const KoViewConverter &converter) const;
private:
qreal squareDistanceToLine(const QPointF &lineA, const QPointF &lineB, const QPointF &point, QPointF &pointOnLine);
QPointF m_boxPoints[5];
};
/// snaps to line guides
class FLAKE_TEST_EXPORT LineGuideSnapStrategy : public KoSnapStrategy
{
public:
LineGuideSnapStrategy();
virtual bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance);
virtual QPainterPath decoration(const KoViewConverter &converter) const;
private:
int m_orientation;
};
#endif // KOSNAPSTRATEGY_H
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