qgsmaptoolextent.h

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/***************************************************************************
    qgsmaptoolextent.h  -  map tool that emits an extent
    ---------------------
    begin                : July 2017
    copyright            : (C) 2017 by Mathieu Pellerin
    email                : nirvn dot asia at gmail 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 QGSMAPTOOLEXTENT_H
#define QGSMAPTOOLEXTENT_H
 
#include "qgis_gui.h"
#include "qgsmaptool.h"
#include "qgspointxy.h"
#include "qgsrubberband.h"
#include "qobjectuniqueptr.h"
 
class QgsMapCanvas;
 

class GUI_EXPORT QgsMapToolExtent : public QgsMapTool
{
    Q_OBJECT
 
  public:
    QgsMapToolExtent( QgsMapCanvas *canvas );
 
    Flags flags() const override { return QgsMapTool::AllowZoomRect; }
    void canvasMoveEvent( QgsMapMouseEvent *e ) override;
    void canvasPressEvent( QgsMapMouseEvent *e ) override;
    void canvasReleaseEvent( QgsMapMouseEvent *e ) override;
    void activate() override;
    void deactivate() override;

    void setRatio( QSize ratio ) { mRatio = ratio; }

    QSize ratio() const { return mRatio; }

    QgsRectangle extent() const;

    void clearRubberBand();
 
  signals:

    void extentChanged( const QgsRectangle &extent );
 
  private:
    void calculateEndPoint( QgsPointXY &point );
 
    void drawExtent();
 
    QObjectUniquePtr<QgsRubberBand> mRubberBand;
 
    QgsPointXY mStartPoint;
    QgsPointXY mEndPoint;
 
    bool mDraw = false;
 
    QSize mRatio;
};
 
#endif