// 3D Engine
//
// Camera for viewing universe.
//
// Author  Matthew Caryl
// Created 9.5.97
//
//  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 Camera extends Entity {
	//
	// Public interface
	//
	
	public Camera(float length) {
		viewfield_length = length;
		}
	
	public Camera(Vector[] vs, int[] ts, Color[] cs, Entity[] children, float length) {
		super(vs, ts, cs, children);
		viewfield_length = length;
		}
	
	public float getViewfield() {
		return viewfield_length;
		}
	
	public void setViewfield(float length) {
		viewfield_length = length;
		}
	
	public void parallel(Matrix M) {
		M.setParallel();
		M.multiply(transform_matrix);
		}
	
	public void perspective(Matrix M) {
		M.setPerspective(viewfield_length);
		M.multiply(transform_matrix);
		}
	
	//
	// Protected interface
	//
	
	protected void transformCorrection() {
		transform_matrix.setTranslate(-x, -y, -z);
		transform_matrix.rotateBy(-ax, -ay, -az);
		}
	
	//
	// Private interface
	//
	
	private float	viewfield_length;
	}