/*
    Copyright (c) 2008-2019 Jan W. Krieger (<jan@jkrieger.de>)

    

    This software is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License (LGPL) as published by
    the Free Software Foundation, either version 2.1 of the License, or
    (at your option) any later version.

    This program 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 Lesser General Public License (LGPL) for more details.

    You should have received a copy of the GNU Lesser General Public License (LGPL)
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/


#include <QObject>
#include <QString>
#include <QPainter>
#include <QPair>
#include "jkqtplotter/jkqtptools.h"
#include "jkqtcommon/jkqtp_imexport.h"
#include "jkqtplotter/jkqtpgraphsbasestylingmixins.h"

#ifndef jkqtpelementsoverlay_H
#define jkqtpelementsoverlay_H

// forward declarations
class JKQTBasePlotter;

/*! \brief this virtual base class describes an interface for graph overlay elements, which are simple geometric
           forms drawn ONTO the graphe, so a redraw of the overlays does NOT require a redraw of the graph.
   \ingroup jkqtplotter_overlays

   These simple primitive elements can be used to e.g. display fast changing indicators on the graph ...
 */
class JKQTP_LIB_EXPORT JKQTPOverlayElement : public QObject {
        Q_OBJECT
    public:
        explicit JKQTPOverlayElement(JKQTBasePlotter *parent = nullptr);

        /** \brief plots the graph to the plotter object specified as parent */
        virtual void draw(JKQTPEnhancedPainter& painter)=0;

        /** \brief returns the parent painter class */
        inline JKQTBasePlotter* getParent() { return parent; }

        /** \brief sets the parent painter class */
        virtual void setParent(JKQTBasePlotter* parent);



        /*! \copydoc visible */ 
        void setVisible(bool __value);
        /*! \copydoc visible */ 
        bool isVisible() const;

    protected:
        /** \brief the plotter object this object belongs to */
        JKQTBasePlotter* parent;

        /** \brief indictaes whether the overlay is visible (at all) */
        bool visible;


        /** \brief tool routine that transforms a QPointF according to the parent's transformation rules */
        QPointF transform(const QPointF& x);

        double transfromX(double x);
        double transfromY(double y);

        /** \brief tool routine that back-transforms a QPointF according to the parent's transformation rules */
        QPointF backTransform(const QPointF& x);

        /** \brief tool routine that transforms a QPointF according to the parent's transformation rules */
        inline QPointF transform(double x, double y) {
            return transform(QPointF(x,y));
        }
        /** \brief tool routine that back-transforms a QPointF according to the parent's transformation rules */
        inline QPointF backTransform(double x, double y) {
            return backTransform(QPointF(x,y));
        }
        /** \brief tool routine that transforms a QVector<QPointF> according to the parent's transformation rules */
        QVector<QPointF> transform(const QVector<QPointF>& x);

        /** \brief tool routine that transforms a QVector<QPointF> according to the parent's transformation rules
         *         and returns a (non-closed) path consisting of lines */
        QPainterPath transformToLinePath(const QVector<QPointF>& x);

        /** \brief tool routine that transforms a QVector<QPointF> according to the parent's transformation rules
         *         and returns a polygon */
        inline QPolygonF transformToPolygon(const QVector<QPointF>& x) {
            return QPolygonF(transform(x));
        }



};



/*! \brief baseclass for a two-position overlay
   \ingroup jkqtplotter_overlays
 */
class JKQTP_LIB_EXPORT JKQTPOverlayTwoPositionOverlay : public JKQTPOverlayElement {
        Q_OBJECT
    public:
        explicit JKQTPOverlayTwoPositionOverlay(double x1, double y1, double x2, double y2, JKQTBasePlotter *parent = nullptr);

        /*! \copydoc x1 */ 
        void setX1(double __value);
        /*! \copydoc x1 */ 
        double getX1() const;
        /*! \copydoc x2 */ 
        void setX2(double __value);
        /*! \copydoc x2 */ 
        double getX2() const;
        /*! \copydoc y1 */ 
        void setY1(double __value);
        /*! \copydoc y1 */ 
        double getY1() const;
        /*! \copydoc y2 */ 
        void setY2(double __value);
        /*! \copydoc y2 */ 
        double getY2() const;
    protected:
        /** \brief x-coordinate of first point of overlay */
        double x1;
        /** \brief y-coordinate of first point of overlay */
        double y1;
        /** \brief x-coordinate of first second of overlay */
        double x2;
        /** \brief y-coordinate of first second of overlay */
        double y2;
};



/*! \brief baseclass for one-coordinate indicator overlays (horizontal/vertical lines
   \ingroup jkqtplotter_overlays
 */
class JKQTP_LIB_EXPORT JKQTPOverlayOneCoordOverlay : public JKQTPOverlayElement {
        Q_OBJECT
    public:
        explicit JKQTPOverlayOneCoordOverlay(double pos, JKQTBasePlotter *parent = nullptr);

        /*! \copydoc position */ 
        void setPosition(double __value);
        /*! \copydoc position */ 
        double getPosition() const;
    protected:
        /** \brief second position for the element */
        double position;
};



/*! \brief baseclass for two-coordinate indicator overlays (horizontal/vertical lines
   \ingroup jkqtplotter_overlays
 */
class JKQTP_LIB_EXPORT JKQTPOverlayTwoCoordOverlay : public JKQTPOverlayOneCoordOverlay {
        Q_OBJECT
    public:
        explicit JKQTPOverlayTwoCoordOverlay(double pos, double pos2, JKQTBasePlotter *parent = nullptr);

        /*! \copydoc position2 */ 
        void setPosition2(double __value);
        /*! \copydoc position2 */ 
        double getPosition2() const;
    protected:
        /** \brief second position for the element */
        double position2;
};



#endif // jkqtpelementsoverlay_H