camera.h

小型的3D游戏引擎

///////////////////////////////////////////////////
//												 //
// Handels the movemnt of the camera. The code	 //
// is based on gametutorials.com's camera		 //
// tutorial.									 //
//												 //
///////////////////////////////////////////////////

#ifndef _CAMERA_H_
#define _CAMERA_H_

#include "math/vector.h"
#include "frustum.h"


class GcCamera
{
public:

	// Constructor / Destructor
	GcCamera();
	~GcCamera();

	void SetScreen( int width, int height ) { m_screenWidth = width; m_screenHeight = height; }

	/* Setting the camera's posiont, point of view, and up vector */

	// Set the camera
	void SetCamera(GcVector3 &sPos, GcVector3 &sView, GcVector3 &sUp);
	void SetCamera(float posX, float posY, float posZ, 
				   float viewX, float viewY, float viewZ,
				   float upX, float upY, float upZ);

	// Set the position
	void SetPostion(GcVector3 &pos);
	void SetPostion(float x, float y, float z);

	// Set the view
	void SetView(GcVector3 &sView);
	void SetView(float x, float y, float z);

	// Set the up vector
	void SetUp(GcVector3 &sUp);
	void SetUp(float x, float y, float z);

	// Set the right vectro
	void SetRight(GcVector3 &sRight);
	void SetRight(float x, float y, float z);


	/* Moving the camera */

	// Move forward / backward (posetive forward, negative backward)
	void MoveFrwBack(float dist);

	// Move up / down (posetive up, negative backward
	void MoveUpDown(float dist);

	// Move in direction
	void MoveDir(GcVector3 dir, float dist);

	// Strafe (posetive right, negative left)
	void Strafe(float dist);

	// Rotate the camera
	void Rotate(float angle, float x, float y, float z);

	// Roll the camera arund the view axi
	void Roll(float angle);


	/* Movement used for look over cameras (one not attached to a object) */

	// Use the move to look
	void MouseLook();

	// Check for movement
	void CheckMovement(float speed);


	/* Update the camera */

	// To be called every frame
	void Update();

	/* Accessors */

	GcVector3 Position() { return position; }
	GcVector3 View()		{ return view; }
	GcVector3 Up()		{ return up; }
	GcVector3 Right()	{ return right; }


private:

	GcVector3	position;			// The position of the camera
	GcVector3	view;				// The view point of the camera
	GcVector3	up;					// Which way is up?
	GcVector3	right;				// Which way is right?

	GcFrustum	frustum;			// The frusutm (visible volyme)
	int m_screenWidth;
	int m_screenHeight;
};

GcCamera * ActiveCamera();

#endif