// 3D Engine
//
// Light for illuminating the universe.
//
// Author  Matthew Caryl
// Created 10.5.97
//
//  Although under copywrite to the author (Matthew Caryl) this code can be copied and modified for non-commercial
//  purposes as long as any derivatives contain this condition.

package ADT;

import java.awt.Color;

public class Light extends Entity {
	//
	// Public interface
	//
	
	public Light(float ambient, float diffuse) {
		light_vector = new Vector(x, y, z);
		setLevel(ambient, diffuse);
		}
	
	public Light(Vector[] vs, int[] ts, Color[] cs, Entity[] children, float ambient, float diffuse) {
		super(vs, ts, cs, children);
		light_vector = new Vector(x, y, z);
		setLevel(ambient, diffuse);
		}
	
	public void setLevel(float ambient, float diffuse) {
		ambient_light = ambient;
		diffuse_light = diffuse;
		}
	
	public float getAmbient() {
		return ambient_light;
		}
	
	public float getDiffuse() {
		return diffuse_light;
		}
	
	//
	// Package interface
	//
	
	void setUniverse(Universe U) {
		universe = U;
		universe.relight(light_vector, ambient_light, diffuse_light);
		}
	
	//
	// Protected interface
	//
	
	protected void transformCorrection() {
		transform_matrix.setRotate(ax, ay, az);
		transform_matrix.translateBy(x, y, z);
		
		light_vector.set(x, y, z);
		if (universe != null)
			universe.relight(light_vector, ambient_light, diffuse_light);
		}
	
	//
	// Private interface
	//
	
	private float		ambient_light;
	private float		diffuse_light;
	private Vector		light_vector;
	private Universe	universe;
	}