import java.awt.*;

public class GND extends Component {
    private Point b;  // the other terminal of this component
    private GNDView gndView;
    public GND (){
	a = new Point(COMPONENT_SIZE, COMPONENT_SIZE);
	b = new Point(COMPONENT_SIZE, 2*COMPONENT_SIZE);
	gndView = new GNDView(a,b);
   }
    public void paintComponent (Graphics2D g) {
	gndView.paintComponent(g);
    }
    public Boolean isUnderPoint(Point p) {
	return (gndView.isUnderPoint(p));
    }
    public  void rotate(){
	Point c=new Point((a.x+b.x)/2,(a.y+b.y)/2);
	int tem = a.y;
	a.y=c.y+(a.x-c.x);
	a.x=c.x-(tem-c.y);
	tem = b.y;
	b.y=c.y+(b.x-c.x);
	b.x=c.x-(tem-c.y);
	gndView.rotate();
    }
    public void setRed(){
	gndView.setRed();
    }
    public void unsetRed(){
	gndView.unsetRed();
    }
    public void translate(int dx, int dy){
	a.translate(dx,dy);
	b.translate(dx,dy);
	gndView.translate(dx,dy);
    }
    public Point distance(Component c) {// here Point is a used as a vector
	double d,min=20000000; // min big enough to ensure change
	Point t, minVector = new Point();
	final Point[] terminals = c.getTerminals();
	for (int i = terminals.length-1; i>=0; i--) {
	    t = terminals[i];
	    d = t.distanceSq(a);
	    if (d < min) {  min=d;  minVector.setLocation(a.x-t.x,a.y-t.y); }
	}
	return minVector;
    }
    public Point[] getTerminals () {
	Point[] t = new Point[1];
	t[0]=a;
	return t;
    }
}