qgscomposernodesitem.h

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/***************************************************************************
                         qgscomposernodesitem.h
    begin                : March 2016
    copyright            : (C) 2016 Paul Blottiere, Oslandia
    email                : paul dot blottiere at oslandia dot com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef QGSCOMPOSERNODESITEM_H
#define QGSCOMPOSERNODESITEM_H

#include "qgscomposeritem.h"
#include <QBrush>
#include <QPen>

class CORE_EXPORT QgsComposerNodesItem: public QgsComposerItem
{
    Q_OBJECT

  public:

    QgsComposerNodesItem( QString mTagName, QgsComposition* c );

    QgsComposerNodesItem( QString mTagName, QPolygonF polygon, QgsComposition* c );

    ~QgsComposerNodesItem();

    bool addNode( const QPointF &pt, const bool checkArea = true, const double radius = 10 );

    void setDisplayNodes( const bool display = true ) { mDrawNodes = display; }

    bool moveNode( const int index, const QPointF &node );

    void paint( QPainter* painter, const QStyleOptionGraphicsItem* itemStyle, QWidget* pWidget ) override;

    int nodeAtPosition( QPointF node, const bool searchInRadius = true, const double radius = 10 );

    bool nodePosition( const int index, QPointF &position );

    bool readXML( const QDomElement& itemElem, const QDomDocument& doc ) override;

    bool removeNode( const int index );

    int nodesSize() { return mPolygon.size(); }

    bool setSelectedNode( const int index );

    int selectedNode() { return mSelectedNode; }

    void unselectNode() { mSelectedNode = -1; }

    bool writeXML( QDomElement& elem, QDomDocument & doc ) const override;

  protected:

    QPolygonF mPolygon;

    virtual bool _addNode( const int nodeIndex, const QPointF &newNode, const double radius ) = 0;

    virtual bool _removeNode( const int nodeIndex ) = 0;

    virtual void _draw( QPainter *painter ) = 0;

    virtual void _readXMLStyle( const QDomElement &elmt ) = 0;

    virtual void _writeXMLStyle( QDomDocument &doc, QDomElement &elmt ) const = 0;

    void rescaleToFitBoundingBox();

    double computeDistance( const QPointF &pt1, const QPointF &pt2 ) const;

    void updateSceneRect();

  private:
    QString mTagName;

    int mSelectedNode;

    bool mDrawNodes;

    void drawNodes( QPainter *painter ) const;
    void drawSelectedNode( QPainter *painter ) const;
};

#endif // QGSCOMPOSERNODESITEM_H