// based
// Camera object (perspective camera). By John Haggerty (Slime).
// http://www.slimeland.com/
// Created January 21, 2003
// originally written in javascript

class cCamera2
{
private:
	cTransform xt;
	cTransform yt;
	cTransform tt[2];

public:
	cVector loc,dir,right,down;
	cRay ray;
	float theta, phi;

	cCamera2()
	{
		theta=0.0f;
		phi=0.0f;

		loc = Vector::O;
		dir = Vector::Z;
		right = Vector::scalar(Vector::X,4.0f/3.0f);
		down = Vector::Y.neg();
	}

	cCamera2(cVector &ploc,cVector &pdir,cVector &pright,cVector &pdown)
	{
		theta=0.0f;
		phi=0.0f;

		setTo(ploc,pdir,pright,pdown);
	}

	void setPos(float x, float y, float z)
	{
		loc.setto(x,y,z);
	}

	void move(float m)
	{
		setRay(0.5f,0.5f);
		loc.x+=ray.dir.x*m;
		loc.y+=ray.dir.y*m;
		loc.z+=ray.dir.z*m;
	}
	
	void rotate(float dt, float dp)
	{
		theta+=dt;
		phi+=dp;
		reset();
		tt[0] = Transform::rotate('x',phi);
		tt[1] = Transform::rotate('y',theta);
		transform(Transform::multipletrans(tt,2));
	}

	void reset()
	{
		//loc = Vector::O;
		dir = Vector::Z;
		right = Vector::scalar(Vector::X,4.0f/3.0f);
		down = Vector::Y.neg();
	}
	
	void setTo(cVector &ploc,cVector &pdir,cVector &pright,cVector &pdown)
	{
		loc = ploc;
		dir = pdir;
		right = pright;
		down = pdown;
	}

	void transform(cTransform &trans)
	{
		//loc = Transform::transformed(trans,loc,false);
		dir = Transform::transformed(trans,dir,true);
		right = Transform::transformed(trans,right,true);
		down = Transform::transformed(trans,down,true);
	}

	void setRay(float xamnt, float yamnt)
	{
		ray.setTo(	loc,
					Vector::add(Vector::add(dir,Vector::scalar(right,(xamnt-0.5f))),
							Vector::scalar(down,(0.5f-yamnt))),
					1.0f);
	}
};