protected Vector<SquirmCell> getThoseOfState(final Vector<SquirmCell> cells, int state) {
// do any of these cells match the state specified? (any type)
// if so return all that match (empty list if none)
final Vector<SquirmCell> v = new Vector<SquirmCell>();
SquirmCell c;
for (Enumeration<SquirmCell> enumx = cells.elements(); enumx.hasMoreElements(); ) {
c = ((SquirmCell) enumx.nextElement());
if (c.isState(state)) {
v.addElement(c);
}
}
return v;
}
protected Vector<SquirmCell> getThoseOfTypeAndState(
Vector<SquirmCell> cells, int type, int state) {
// do any of these cells match the type and state specified?
// if so return all that match (empty list if none)
Vector<SquirmCell> v = new Vector<SquirmCell>();
SquirmCell c;
for (Enumeration<SquirmCell> enumx = cells.elements(); enumx.hasMoreElements(); ) {
c = ((SquirmCell) enumx.nextElement());
if (type != -1) {
if (c.isTypeAndState(type, state)) v.addElement(c);
} else if (c.isState(state)) v.addElement(c);
}
return v;
}
protected void tryReaction(
final SquirmCellSlot cell_grid[][],
final SquirmCell cell,
final Vector<SquirmCell> neighbours,
char us_type,
int us_state,
boolean current_bond,
char them_type,
int them_state,
int future_us_state,
boolean future_bond,
int future_them_state,
final SquirmReaction reaction) {
// us_type is one of {e,f,a,b,c,d,x}
if (us_type != 'e'
&& us_type != 'f'
&& us_type != 'a'
&& us_type != 'b'
&& us_type != 'c'
&& us_type != 'd'
&& us_type != 'x') throw new Error("SquirmChemistry::Reaction() : invalid us_type");
// them_type is one of {e,f,a,b,c,d,x,y}
if (them_type != 'e'
&& them_type != 'f'
&& them_type != 'a'
&& them_type != 'b'
&& them_type != 'c'
&& them_type != 'd'
&& them_type != 'x'
&& them_type != 'y') throw new Error("SquirmChemistry::Reaction() : invalid them_type");
// sanity check on the states requested
if (us_state < 0 || them_state < 0 || future_us_state < 0 || future_them_state < 0)
throw new Error("SquirmChemistry::tryReaction() : states less than zero not permitted");
// Are we the right kind of cell for this reaction?
if ((us_type != 'x' && cell.isTypeAndState(us_type, us_state))
|| (us_type == 'x' && cell.isState(us_state))) {
// do we have a neighbour (bonded/not) that is the right kind for
// this reaction?
final Vector<SquirmCell> search_from = current_bond ? cell.getBonds() : neighbours;
Vector<SquirmCell> ns;
// if them_type specified then search for it
if (them_type != 'x' && them_type != 'y')
ns = getThoseOfTypeAndState(search_from, them_type, them_state);
// if unspecified but to be same as us_type then search for it
else if (them_type == 'x' && us_type == 'x')
ns = getThoseOfTypeAndState(search_from, cell.getType(), them_state);
// must be unspecified
else if ((them_type == 'x' && us_type != 'x') || them_type == 'y')
ns = getThoseOfState(search_from, them_state);
else throw new Error("SquirmChemistry::tryReaction() : unexpected case statement");
// try the reaction on each of the possibles
for (final Enumeration<SquirmCell> e = ns.elements(); e.hasMoreElements(); ) {
final SquirmCell n = (SquirmCell) e.nextElement();
// reactions can happen if the two cells are right next to each
// other (share a face) or over a diagonal (share a corner) if
// the other diagonal
// doesn't have a bond
boolean can_react = false;
if (rightNextToEachOther(cell, n)) can_react = true;
else {
// if either other diagonal square is empty then OK
if (cell_grid[cell.getX()][n.getY()].queryEmpty()
|| cell_grid[n.getX()][cell.getY()].queryEmpty()) can_react = true;
else {
// otherwise, if there is no bond between diagonals then
// still OK
final SquirmCell cellA = cell_grid[cell.getX()][n.getY()].getOccupant();
final SquirmCell cellB = cell_grid[n.getX()][cell.getY()].getOccupant();
if (!cellA.getBonds().contains(cellB)) {
can_react = true;
} // End of if
}
} // End of if - else //
if (can_react) {
// make or break bonds as specified
if (current_bond && !future_bond) {
LOGGER.info(
"Breaking bond : UsType="
+ us_type
+ " UsState="
+ us_state
+ " ThemType="
+ them_type
+ " ThemState="
+ them_state);
cell.breakBondWith(n);
} else if (!current_bond && future_bond) {
LOGGER.info(
"Making bond for reaction : UsType="
+ us_type
+ " UsState="
+ us_state
+ " ThemType="
+ them_type
+ " ThemState="
+ them_state
+ " reaction="
+ reaction);
cell.makeBondWith(n, reaction);
}
// set our states to their new values
cell.setState(future_us_state);
n.setState(future_them_state);
break;
}
}
}
}
protected boolean rightNextToEachOther(SquirmCell cell1, SquirmCell cell2) {
return (Math.abs(cell1.getX() - cell2.getX()) + Math.abs(cell1.getY() - cell2.getY()) < 2);
}
