//private Body next;
//private Body procNext;
/**
* Create an empty body.
*/
public static Body makeBody ()
{
Body b = new Body ();
b.initNode ();
b.vel = MathVector.makeMathVector ();
b.acc = MathVector.makeMathVector ();
b.newAcc = MathVector.makeMathVector ();
b.phi = 0.0;
return b;
}
/**
* Descend Tree and insert particle. We're at a cell so
* we need to move down the tree.
*
* @param p the body to insert into the tree
* @param xpic
* @param l
* @param tree the root of the tree
* @return the subtree with the new body inserted
*/
public override Cell loadTree (Body p, MathVector xpic, int l, BTree tree)
{
// move down one level
int si = Node.oldSubindex (xpic, l);
Node rt = subp [si];
if (rt != null)
subp [si] = rt.loadTree (p, xpic, l >> 1, tree);
else
subp [si] = p;
return this;
}
/**
* Descend Tree and insert particle. We're at a body so we need to
* create a cell and attach this body to the cell.
*
* @param p the body to insert
* @param xpic
* @param l
* @param tree the root of the data structure
* @return the subtree with the new body inserted
*/
public override Cell loadTree (Body p, MathVector xpic, int l, BTree tree)
{
// create a Cell
Cell retval = Cell.makeCell ();
int si = subindex (tree, l);
// attach this Body node to the cell
retval.subp [si] = this;
// move down one level
si = Node.oldSubindex (xpic, l);
Node rt = retval.subp [si];
if (rt != null)
retval.subp [si] = rt.loadTree (p, xpic, l >> 1, tree);
else
retval.subp [si] = p;
return retval;
}
public abstract Cell loadTree (Body p, MathVector xpic, int l, BTree root);
