#ifndef _FRUSTUM_H_
#define _FRUSTUM_H_

#include <QtXml>
#include <QColor>

#include "math/ProjectionMatrix.h"
#include "math/TransformMatrix.h"

namespace projection
{
/**
 * Frustum data class to represent projection area and view frustum.
 */
class Frustum : public QObject
{
    Q_OBJECT

public:

    /**
     * Constructor.
     */
    Frustum();

    /**
     * Destructor.
     */
    virtual ~Frustum();

    /**
     * Set projection matrix of the frustum.
     *
     * @param matrix Projection matrix of the frustum.
     */
    void setProjectionMatrix(const ProjectionMatrix& matrix);

    /**
     * Retrieve projection matrix of the frustum.
     *
     * @return Projection matrix of the frustum.
     */
    ProjectionMatrix getProjectionMatrix() const;

    /**
     * Set transform matrix of the frustum.
     *
     * @param matrix Transform matrix of the frustum.
     */
    void setTransformMatrix(const TransformMatrix& matrix);

    /**
     * Retrieve transform matrix of the frustum.
     *
     * @return Transform matrix of the frustum.
     */
    TransformMatrix getTransformMatrix() const;

    /**
     * Set color of the frustum shape object.
     *
     * @param color Color of the frustum shape object.
     */
	void setColor(const QColor& color);

    /**
     * Retrieve color of the frustum shape object.
     *
     * @return Color of the frustum shape object.
     */
    QColor getColor() const;

    /**
     * Show or hide the frustum shape object.
     *
     * @param bShow True to show the frustum shape object, false to hide.
     */
    void setShow(bool bShow);

    /**
     * Check whether the frustum shape object is shown or not.
     *
     * @return True if the frustum shape object is shown.
     */
    bool getShow() const;

    /**
     * Show or hide the frustum projected area.
     *
     * @param bShow True to show the frustum projected area, false to hide.
     */
    void setShowArea(bool bShow);

    /**
     * Check whether the frustum projected area is shown or not.
     *
     * @return True if the frustum projected area is shown.
     */
    bool getShowArea() const;

    /**
     * Set far clip plane distance of the frame shape object. It doesn't modify the frustum data.
     *
     * @param farDist Far clip plane distance of the frame shape object.
     */
    void setVisibleFar(float farDist);

    /**
     * Retrieve far clip plane distance of the frame shape object.
     *
     * @return Far clip plane distance of the frame shape object.
     */
    float getVisibleFar() const;

    /**
     * Draw frustum shape object.
     *
     * @param bSelected True to draw with selection highlight.
     */
	void draw(bool bSelected=false);

    /**
     * Assignment operator.
     *
     * @param frustum Assignment source frustum.
     */
    Frustum& operator=(const Frustum& frustum);

    /**
     * Restore the frustum data from XML data.
     *
     * @param element Parent XML element of the frustum data.
     */
    virtual void initFromDOMElement(const QDomElement& element);

    /**
     * Store the current frustum data as XML data.
     *
     * @param name XML node name of the data.
     * @param doc XML document to store the data.
     * @return Current frustum data as XML data.
     */
    virtual QDomElement domElement(const QString& name, QDomDocument& doc) const;

signals:

    /**
     * Notify that the frustum data is changed.
     */
    void dataChanged();

protected:

    ProjectionMatrix m_projectionMatrix;    //!< Projection matrix of the frustum.
    TransformMatrix m_transformMatrix;      //!< Transform matrix of the frustum.
    bool m_bShow;                           //!< True if the frustum shape object is shown.
    bool m_bShowArea;                       //!< True if the frustum projected area is shown.
    float m_visibleFar;                     //!< Far clip plane distance of the frustum shape object.
	QColor m_color;                         //!< Color of the frustum shape object.
};

}; // projection

#endif // _FRUSTUM_H_