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//   
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#ifndef _BCF_2_1_PERSPECTIVE_CAMERA_H
#define _BCF_2_1_PERSPECTIVE_CAMERA_H

#include "BcfCommon.h"

#include "BcfElement.h"

/** \details
Contains declarations related to working with BCF files content.
*/
namespace OdBcf {

  class OdBcfValidationContext;

}

/** \details
Contains declarations related to working with data of the BCF format version 2.1.
*/
namespace OdBcf_2_1 {

  class OdBcfPoint;
  typedef OdSmartPtr<OdBcfPoint> OdBcfPointPtr;

  class OdBcfDirection;
  typedef OdSmartPtr<OdBcfDirection> OdBcfDirectionPtr;

  /** \details
  A class that stores and operates a perspective camera data within the BCF format.
  */
  class BCF_2_1_EXPORT OdBcfPerspectiveCamera : public OdBcf::OdBcfElement
  {
  public:

    //DOM-IGNORE-BEGIN
    ODRX_DECLARE_MEMBERS(OdBcfPerspectiveCamera);
    //DOM-IGNORE-END

    /** \details
    Creates a new perspective camera object.
    \param pCameraViewPoint [in] A smart pointer to the object that represents the camera's view point.
    \param pCameraDirection [in] A smart pointer to the object that represents the camera direction.
    \param pCameraUpVector  [in] A smart pointer to the object that represents the camera's up vector.
    \param fieldOfView      [in] A value of the camera field of view.
    \returns A smart pointer to the created <exref target="../tifc_api_cpp/OdBcf_2_1__OdBcfPerspectiveCamera.html">OdBcfPerspectiveCamera</exref> instance.
    */
    static OdSmartPtr<OdBcfPerspectiveCamera> createObject(
      const OdBcfPointPtr     &pCameraViewPoint,
      const OdBcfDirectionPtr &pCameraDirection,
      const OdBcfDirectionPtr &pCameraUpVector,
      double                   fieldOfView);

    /** \details
    Creates a new perspective camera object with default parameters.
    */
    OdBcfPerspectiveCamera();

    /** \details
    Reads XML data into ODA data structures.
    \param pParent [in] A pointer to the parent element of the data structure.
    \returns eOk if data was successfully read; otherwise, the method returns an appropriate error code.
    */
    virtual OdResult inFields(TiXmlElement *pParent) ODRX_OVERRIDE;

    /** \details
    Writes data into XML structures.
    \param pParent [in] A pointer to the parent element of the data structure.
    \returns eOk if data was successfully written; otherwise, the method returns an appropriate error code.
    */
    virtual OdResult outFields(TiXmlElement *pParent) const ODRX_OVERRIDE;

    /** \details
    Retrieves the perspective camera viewpoint.
    \returns A smart pointer to the <exref target="../tifc_api_cpp/OdBcf_2_1__OdBcfPoint.html">OdBcfPoint</exref> object that represents the camera viewpoint.
    \remarks 
    The point returned by the method can't be modified in the calling subroutine.
    */
    const OdBcfPointPtr& getCameraViewPoint() const;

    /** \details
    Defines whether the perspective camera viewpoint is not initialized.
    \returns true if the camera viewpoint is not initialized; otherwise, the method returns false.
    */
    bool isCameraViewPointUnset() const;

    /** \details
    Retrieves the camera direction.
    \returns A smart pointer to the <exref target="../tifc_api_cpp/OdBcf_2_1__OdBcfDirection.html">OdBcfDirection</exref> object that represents the camera direction.
    \remarks 
    The direction object returned by the method can't be modified in the calling subroutine.
    */
    const OdBcfDirectionPtr& getCameraDirection() const;

    /** \details
    Defines whether the camera direction is not initialized.
    \returns true if the camera direction is not initialized; otherwise, the method returns false.
    */
    bool isCameraDirectionUnset() const;

    /** \details
    Retrieves the camera up-vector.
    \returns A smart pointer to the <exref target="../tifc_api_cpp/OdBcf_2_1__OdBcfDirection.html">OdBcfDirection</exref> object that represents the camera up-vector.
    \remarks 
    The direction object returned by the method can't be modified in the calling subroutine.
    */
    const OdBcfDirectionPtr& getCameraUpVector() const;

    /** \details
    Defines whether the camera up-vector is not initialized.
    \returns true if the up-vector object is not initialized; otherwise, the method returns false.
    */
    bool isCameraUpVectorUnset() const;

    /** \details
    Retrieves the perspective camera's field of view.
    \returns A double value that contains the field of view.
    \remarks 
    The field view value returned by the method can't be modified in the calling subroutine.
    */
    const double& getFieldOfView() const;

    /** \details
    Defines whether the perspective camera's field of view is not initialized. 
    \returns true if the field of value is not initialized; otherwise, the method returns false.
    */
    bool isFieldOfViewUnset() const;

    //DOM-IGNORE-BEGIN
  protected:
    OdBcfPointPtr     m_pCameraViewPoint;
    OdBcfDirectionPtr m_pCameraDirection;
    OdBcfDirectionPtr m_pCameraUpVector;
    double            m_fieldOfView;

    /** \details
    Checks whether the perspective camera instance has all required fields initialized.
    \param context [in/out] A raw pointer to the validation context to store results in.
    \returns true if all required fields are initialized; otherwise the method returns false.
    */
    virtual bool validateData(OdBcf::OdBcfValidationContext *context) const ODRX_OVERRIDE;
    //DOM-IGNORE-END
  };

  /** \details 
  A data type that represents a smart pointer to an <exref target="../tifc_api_cpp/OdBcf_2_1__OdBcfPerspectiveCamera.html">OdBcfPerspectiveCamera</exref> object.
  */
  typedef OdSmartPtr<OdBcfPerspectiveCamera> OdBcfPerspectiveCameraPtr;

} //namespace OdBcf_2_1

#endif // _BCF_2_1_PERSPECTIVE_CAMERA_H