//
// triangle3d.h
//
// An array of three point3d.
//
// Copyright (C) J. Belson	1999.02.07
//


#ifndef _TRIANGLE3D_H_
#define _TRIANGLE3D_H_


#include "fcolour.h"
#include "point3d.h"
#include "vector3d.h"


/// Triangle attributes
enum flags {
	eINVISIBLE		= 1<<0,
	eSEA			= 1<<1,
	eLOW_GRAD		= 1<<2,
	eMED_GRAD		= 1<<3,
	eHIGH_GRAD		= 1<<4,
	eSHADOW			= 1<<5
};


/**
 * Represents a triange in 3d space
 */
class triangle3d {

	private:
		int			state;			// Information about triangle

	public:
		triangle3d(int p1, int p2, int p3);
		triangle3d(void) { state = 0; };

		int			point[3];		// Index into point array
		fcolour		col;			// Triangle base colour
		vector3d	normal;			// Normal vector

		void set_flag(flags f);			// Manipulate flag
		void clear_flag(flags f);		//  states
		bool get_flag(flags f) const;	//

		void get(int* p1, int* p2, int* p3);
		void set(int p1, int p2, int p3);
		void calculate_normal(const point3d* pnt3d);

		// XXX should be static to avoid bloating object size
		point3d find_centre(const point3d* points);

		void set_colour(const fcolour& col);
		// Get colour of this triangle
		void get_colour(fcolour* c);

};

#endif	// _TRIANGLE3D_H_