// OpenGL Camera Class
// 
// Author: Stephen Manley - smanley@nyx.net
// Date: Oct 12th 1999
// 
// Description:
// 
// This is the decription for the camera class
// 
//////////////////////////////////////////////////////////////////////////////////////

#ifndef CAMERA
#define CAMERA

#include <windows.h>
#include <GL/gl.h>
//#include <GL/glut.h>
#include <glut.h>
#include <math.h>

#define ORTHOGRAPHIC = 10000;
#define PROJECTION   = 10001;
 
class Camera
{
	public:

		Camera();
		Camera(int projectionType);
		~Camera();

		// Actions
		void on();
		void off();
		void lookAtScene();
		void clear(float r=0, float g=0, float b=0);
		void clearDepth();
		void clearAll(float r=0, float g=0, float b=0);

		// Save/restore settings
		void save();
		void restore();

		// Motion
		void moveLeft(double dist);
		void moveRight(double dist);
		void moveUp(double dist);
		void moveDown(double dist);
		void moveForward(double dist);
		void moveBackward(double dist);
		
		void moveEye(double dx, double dy, double dz);
		void moveCenter(double dx, double dy, double dz);

		void rotateEye(double dx, double dy);
		void rotatePoint(double x, double y, double z, double dx, double dy);
		void rotateAxis(double degrees, double x, double y, double z);	

		// Modifiers
		void setProjection(double l, double r, double t, double b, double n, double f);
		void setProjection(double l, double r, double t, double b);
		void setProjection(double f, double asp, double n, double fr, int i);
		void setEye(double eX, double eY, double eZ);
		void setUp(double uX, double uY, double uZ);
		void setCenter(double cX, double cY, double cZ);
		void setCameraNumber(int val);

		void getProjection(double &l, double &r, double &t, double &b, double &n, double &f);
		void getProjection(double &l, double &r, double &t, double &b);
		void getProjection(double &f, double &asp, double &n, double &fr, int &i);
		void getEye(double &eX, double &eY, double &eZ);
		void getUp(double &uX, double &uY, double &uZ);
		void getCenter(double &cX, double &cY, double &cZ);

		void calculateNormal();

	private:

		// What is the current camera number?
		int cameraNumber;
		
		// Is camera active?
		int enabled;

		// Projection information
		double nearl;
		double farl;
		double left;
		double right;
		double top;
		double bottom;
	    double aspect;
	    double fov;

		// Normal to the eye position
		double normalX;
		double normalY;
		double normalZ;

		// View to scene center vector
		double viewX;
		double viewY;
		double viewZ;

		// Cumulative eye rotation
	    double rotationEyeX;
	    double rotationEyeY;

		// Eye position
		double eyeX;
		double eyeY;
		double eyeZ;

		// Scene center
		double centerX;
		double centerY;
		double centerZ;			

		// Up orientation vector
		double upX;
		double upY;
		double upZ;
};
#endif