import java.awt.*;

class DrgItm extends Itm{
	Point ds, bk;
	boolean inDrg;

	public DrgItm(Point p, int z){
		super(p, z);
		inDrg = false;
	}
	public DrgItm(Point p){
		this(p, 0);
	}
	Point drgP(Point p){
		return Pts.add(bk,Pts.sub(p,ds));
	}
	public void drgSta(Point p){
		ds = p;
		bk = pt();
	}
	public void drg(Point p){
		setPt(drgP(p));
	}
	public void drgEnd(Point p){
		setPt(drgP(p));
	}
}

// EOF