File indexing completed on 2024-05-12 15:56:51

 /* This file is part of the KDE project
  * SPDX-FileCopyrightText: 2008-2009 Jan Hambrecht <jaham@gmx.net>
  *
  * SPDX-License-Identifier: LGPL-2.0-or-later
  */
 
 #ifndef KOSNAPSTRATEGY_H
 #define KOSNAPSTRATEGY_H
 
 #include "KoSnapGuide.h"
 
 #include <QLineF>
 
 class TestSnapStrategy;
 class KoPathPoint;
 class KoSnapProxy;
 class KoViewConverter;
 
 class QTransform;
 class QPainterPath;
 
 class KRITAFLAKE_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 KRITAFLAKE_EXPORT OrthogonalSnapStrategy : public KoSnapStrategy
 {
 public:
     OrthogonalSnapStrategy();
     bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance) override;
     QPainterPath decoration(const KoViewConverter &converter) const override;
 private:
     QLineF m_hLine;
     QLineF m_vLine;
 };
 
 /// snaps to path points
 class KRITAFLAKE_EXPORT NodeSnapStrategy : public KoSnapStrategy
 {
 public:
     NodeSnapStrategy();
     bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance) override;
     QPainterPath decoration(const KoViewConverter &converter) const override;
 };
 
 /// snaps extension lines of path shapes
 class KRITAFLAKE_EXPORT ExtensionSnapStrategy : public KoSnapStrategy
 {
     friend class TestSnapStrategy;
 public:
     ExtensionSnapStrategy();
     bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance) override;
     QPainterPath decoration(const KoViewConverter &converter) const override;
 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 KRITAFLAKE_EXPORT IntersectionSnapStrategy : public KoSnapStrategy
 {
 public:
     IntersectionSnapStrategy();
     bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance) override;
     QPainterPath decoration(const KoViewConverter &converter) const override;
 };
 
 /// snaps to the canvas grid
 class KRITAFLAKE_EXPORT GridSnapStrategy : public KoSnapStrategy
 {
 public:
     GridSnapStrategy();
     bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance) override;
     QPainterPath decoration(const KoViewConverter &converter) const override;
 };
 
 /// snaps to shape bounding boxes
 class KRITAFLAKE_EXPORT BoundingBoxSnapStrategy : public KoSnapStrategy
 {
     friend class TestSnapStrategy;
 public:
     BoundingBoxSnapStrategy();
     bool snap(const QPointF &mousePosition, KoSnapProxy * proxy, qreal maxSnapDistance) override;
     QPainterPath decoration(const KoViewConverter &converter) const override;
 private:
     qreal squareDistanceToLine(const QPointF &lineA, const QPointF &lineB, const QPointF &point, QPointF &pointOnLine);
     QPointF m_boxPoints[5];
 };
 
 // KoGuidesData has been moved into Krita. Please port this class!
 //
 /// snaps to line guides
 // class KRITAFLAKE_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