// Copyright (C) 2002-2007 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#ifndef __I_CAMERA_SCENE_NODE_H_INCLUDED__
#define __I_CAMERA_SCENE_NODE_H_INCLUDED__

#include "ISceneNode.h"
#include "IEventReceiver.h"

namespace irr
{
namespace scene
{
	struct SViewFrustum;

	//! Scene Node which is a (controlable) camera.
	/** The whole scene will be
	rendered from the cameras point of view. Because the ICameraScenNode
	is a SceneNode, it can be attached to any other scene node, and will
	follow its parents movement, rotation and so on.
	*/
	class ICameraSceneNode : public ISceneNode, public IEventReceiver
	{
	public:

		//! Constructor
		ICameraSceneNode(ISceneNode* parent, ISceneManager* mgr, s32 id, 
			const core::vector3df& position = core::vector3df(0,0,0),
			const core::vector3df& rotation = core::vector3df(0,0,0),
			const core::vector3df& scale = core::vector3df(1.0f,1.0f,1.0f))
			: ISceneNode(parent, mgr, id, position, rotation, scale), IsOrthogonal(false) {}

		//! Destructor
		virtual ~ICameraSceneNode() {};

		//! Sets the projection matrix of the camera. 
		/** The core::matrix4 class has some methods
		to build a projection matrix. e.g: core::matrix4::buildProjectionMatrixPerspectiveFovLH.
		Note that the matrix will only stay as set by this method until one of 
		the following Methods are called: setNearValue, setFarValue, setAspectRatio, setFOV.
		\param projection: The new projection matrix of the camera.  */
		virtual void setProjectionMatrix(const core::matrix4& projection) = 0;

		//! Gets the current projection matrix of the camera.
		/** \return Returns the current projection matrix of the camera. */
		virtual const core::matrix4& getProjectionMatrix() = 0;

		//! Gets the current view matrix of the camera.
		/** \return Returns the current view matrix of the camera. */
		virtual const core::matrix4& getViewMatrix() = 0;

		//! It is possible to send mouse and key events to the camera.
		/** Most cameras
		may ignore this input, but camera scene nodes which are created for 
		example with ISceneManager::addMayaCameraSceneNode or
		ISceneManager::addMeshViewerCameraSceneNode, may want to get this input
		for changing their position, look at target or whatever.  */
		virtual bool OnEvent(SEvent event) = 0;

		//! Sets the look at target of the camera
		/** \param pos: Look at target of the camera. */
		virtual void setTarget(const core::vector3df& pos) = 0;

		//! Gets the current look at target of the camera
		/** \return Returns the current look at target of the camera */
		virtual core::vector3df getTarget() const = 0;

		//! Sets the up vector of the camera.
		/** \param pos: New upvector of the camera. */
		virtual void setUpVector(const core::vector3df& pos) = 0;

		//! Gets the up vector of the camera.
		/** \return Returns the up vector of the camera. */
		virtual core::vector3df getUpVector() const = 0;

		//! Gets the value of the near plane of the camera.
		/** \return Returns the value of the near plane of the camera. */
		virtual f32 getNearValue() = 0;

		//! Gets the value of the far plane of the camera.
		/** \return Returns the value of the far plane of the camera. */
		virtual f32 getFarValue() = 0;

		//! Gets the aspect ratio of the camera.
		/** \return Returns the aspect ratio of the camera. */
		virtual f32 getAspectRatio() = 0;

		//! Gets the field of view of the camera.
		/** \return Returns the field of view of the camera in radiants. */
		virtual f32 getFOV() = 0;

		//! Sets the value of the near clipping plane. (default: 1.0f)
		/** \param zn: New z near value. */
		virtual void setNearValue(f32 zn) = 0;

		//! Sets the value of the far clipping plane (default: 2000.0f)
		/** \param zf: New z far value. */
		virtual void setFarValue(f32 zf) = 0;

		//! Sets the aspect ratio (default: 4.0f / 3.0f)
		/** \param aspect: New aspect ratio. */
		virtual void setAspectRatio(f32 aspect) = 0;

		//! Sets the field of view (Default: PI / 2.5f)
		/** \param fovy: New field of view in radiants. */
		virtual void setFOV(f32 fovy) = 0;

		//! Returns the view frustum. 
		/** Needed sometimes by bspTree or LOD render nodes.
		\return Returns the current view frustum. */
		virtual const SViewFrustum* getViewFrustum() const = 0;

		//! Disables or enables the camera to get key or mouse inputs.
		/** If this is set to true, the camera will respond to key inputs
		 otherwise not. */
		virtual void setInputReceiverEnabled(bool enabled) = 0;

		//! Returns if the input receiver of the camera is currently enabled.
		virtual bool isInputReceiverEnabled() = 0;

		//! Returns if a camera is orthogonal.
		/** This setting does not change anything of the view or projection matrix. However
		it influences how collision detection and picking is done with this camera. */
		virtual bool isOrthogonal() 
		{
			_IRR_IMPLEMENT_MANAGED_MARSHALLING_BUGFIX;
			return IsOrthogonal;
		} 

		//! Sets if this camera should return if it is orthogonal. 
		/** This setting does not change anything of the view or projection matrix. However
		it influences how collision detection and picking is done with this camera. */
		void setIsOrthogonal( bool orthogonal )
		{
			IsOrthogonal = orthogonal;
		}


	private:

		bool IsOrthogonal;
	};

} // end namespace scene
} // end namespace irr

#endif