import java.awt.*;
import java.awt.geom.*;
import java.util.*;

public class Circuit {
    private ArrayList<Component> components;
    private CircuitPanel cPanel;
    public static final double UNION_DISTANCE=36.0;

    public Circuit (CircuitPanel cPanel){
	components = new ArrayList<Component>();
	this.cPanel=cPanel;
    }
    public void add(Component com){
	components.add(com);
	cPanel.repaint();
    }
    public void paintComponents (Graphics2D g) {
	for (int i=components.size()-1; i >= 0; i--) 
	    components.get(i).paintComponent(g);
    }
    public Component find(Point p) {
	for (int i=components.size()-1; i >= 0; i--) 
	    if (components.get(i).isUnderPoint(p))
		return components.get(i);
	return null;	
    }
    public Point findNearComponent(Component c) {
	Point minDistance=null, distance, origen=new Point();
	if (components.size() == 1) return null; // es la única
	for (int i=components.size()-1; i >= 0; i--) 
	    if (components.get(i) != c){ // no es la misma
		distance = components.get(i).distance(c);
		if (minDistance == null) 
		    minDistance = distance;
		else
		    if(distance.distanceSq(origen) < minDistance.distanceSq(origen))
			minDistance = distance;
	    }
	if (minDistance.distanceSq(origen) < UNION_DISTANCE)
	    return minDistance;
	else 
	    return null;
    }    
}