QGCMapCircle.h

/****************************************************************************
 *
 *   (c) 2009-2016 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
 *
 * QGroundControl is licensed according to the terms in the file
 * COPYING.md in the root of the source code directory.
 *
 ****************************************************************************/

#pragma once

#include <QObject>
#include <QGeoCoordinate>
#include <QVariantList>
#include <QPolygon>

#include "QmlObjectListModel.h"
#include "FactSystem.h"

/// The QGCMapCircle represents a circular area which can be displayed on a Map control.
class QGCMapCircle : public QObject
{
    Q_OBJECT

public:
    QGCMapCircle(QObject* parent = NULL);
    QGCMapCircle(const QGeoCoordinate& center, double radius, QObject* parent = NULL);
    QGCMapCircle(const QGCMapCircle& other, QObject* parent = NULL);

    const QGCMapCircle& operator=(const QGCMapCircle& other);

    Q_PROPERTY(bool             dirty       READ dirty          WRITE setDirty          NOTIFY dirtyChanged)
    Q_PROPERTY(QGeoCoordinate   center      READ center         WRITE setCenter         NOTIFY centerChanged)
    Q_PROPERTY(Fact*            radius      READ radius                                 CONSTANT)
    Q_PROPERTY(bool             interactive READ interactive    WRITE setInteractive    NOTIFY interactiveChanged)

    /// Saves the polygon to the json object.
    ///     @param json Json object to save to
    void saveToJson(QJsonObject& json);

    /// Load a circle from json
    ///     @param json Json object to load from
    ///     @param errorString Error string if return is false
    /// @return true: success, false: failure (errorString set)
    bool loadFromJson(const QJsonObject& json, QString& errorString);

    // Property methods

    bool            dirty       (void) const { return _dirty; }
    QGeoCoordinate  center      (void) const { return _center; }
    Fact*           radius      (void) { return &_radius; }
    bool            interactive (void) const { return _interactive; }

    void setDirty       (bool dirty);
    void setCenter      (QGeoCoordinate newCenter);
    void setInteractive (bool interactive);

    static const char* jsonCircleKey;

signals:
    void dirtyChanged       (bool dirty);
    void centerChanged      (QGeoCoordinate center);
    void interactiveChanged (bool interactive);

private slots:
    void _setDirty(void);

private:
    void _init(void);

    bool            _dirty;
    QGeoCoordinate  _center;
    Fact            _radius;
    bool            _interactive;

    QMap<QString, FactMetaData*> _nameToMetaDataMap;

    static const char* _jsonCenterKey;
    static const char* _jsonRadiusKey;
    static const char* _radiusFactName;
};