//get OffSpring of a treenode
public List<TreeNode> generateOffspring(TreeNode n) {
List<BusNode> newArrayBusNode;
BusStop newStop, currentStop;
currentStop = searchArrayStop(n.getCurrentNode().stopCode);
List<TreeNode> newList = new List<TreeNode>();
if (n.getCurrentNode().nextNode != null) {
string stop_name = n.getCurrentNode().nextNode.stopCode;
newStop = searchArrayStop(stop_name);
newArrayBusNode = newStop.arrayNode;
} else {
return null;
}
int newSize = newArrayBusNode.Count();
for (int i = 0; i < newSize; i++) {
TreeNode newTreeNode;
try {
newTreeNode = new TreeNode(newArrayBusNode[i], n);
if ((newTreeNode.getCurrentNode().busCode == n.getCurrentNode().busCode) && (newTreeNode.getCurrentNode().stopCode == n.getCurrentNode().stopCode))
{
continue;
}
else if (checkLine(newTreeNode) >= 0) {
newTreeNode.setParent(n);
newList.Insert(0, newTreeNode);
return newList;
}
else if (!(newTreeNode.getCurrentNode().busCode == n.getCurrentNode().busCode)
|| //(newTreeNode.getCurrentNode().getLine().getDirection() != n.getCurrentNode().getLine().getDirection() &&
newTreeNode.getCurrentNode().busCode == n.getCurrentNode().busCode) { //) {
newTreeNode.setNumberOfChange(n.getNumberOfChange() + 1);
newTreeNode.setPreviousDistance(n.getPreviousDistance() + BusFunction.convertToDistance(currentStop.geo, newStop.geo));
newTreeNode.setWeight(newTreeNode.getNumberOfChange() * 6.25 + newTreeNode.getPreviousDistance() + heuristicFuntion(newStop, endStop));
newTreeNode.setParent(n);
newList.Add(newTreeNode);
} else {
newTreeNode.setNumberOfChange(n.getNumberOfChange());
newTreeNode.setPreviousDistance(n.getPreviousDistance()
+ BusFunction.convertToDistance(newStop.geo, currentStop.geo));
newTreeNode.setWeight(newTreeNode.getNumberOfChange() * 6.25 + newTreeNode.getPreviousDistance() + heuristicFuntion(newStop, endStop));
newTreeNode.setParent(n);
newList.Add(newTreeNode);
}
} catch (Exception exc) {
//e.printStackTrace();
}
}
return newList;
}
/*
* OPEN is the List which include BusNode not been traverse
* answer is the solution
*/
public void algorithm() {
answer.Clear();
if (startStop == null) {
startStop = searchArrayStop(startPlace);
}
if (endStop == null) {
endStop = searchArrayStop(endPlace);
}
if (startStop == null || endStop == null) {
return;
} else {
arrLine = new List<BusItem>();
List<BusNode> tempArrayNode = startStop.arrayNode;
for (int i = 0; i < tempArrayNode.Count; i++) {
TreeNode newTreeNode = new TreeNode(tempArrayNode[i], 0, 0);
newTreeNode.setWeight(heuristicFuntion(startStop, endStop));
newTreeNode.setParent(null);
OPEN.Add(newTreeNode);
}
for (int i = 0; i < endStop.arrayNode.Count; i++) {
//arrLine.Add(endStop.arrayNode[i].getLine());
BusItem bus = SampleDataSource.FindBus(endStop.arrayNode[i].busCode);
arrLine.Add(bus);
}
while (true) {
if (!OPEN.Any()) {
//System.out.println("12345");
OPEN.Clear();
if (offspring != null) {
offspring.Clear();
}
break;
}
//find the min index and the minimum weight of OPEN's BusNode
minIndex = 0;
fmin = OPEN[minIndex].getWeight();
int openSize = OPEN.Count();
for (int i = 0; i < openSize; i++) {
if (OPEN[i].getWeight() < fmin) {
minIndex = i;
fmin = OPEN[i].getWeight();
}
}
TreeNode newTreeNode = OPEN[minIndex];
OPEN.Remove(newTreeNode);
count++;
//if you reach end place, save the answer and return
if (newTreeNode.getCurrentNode().stopCode == endStop.Code) {
//System.out.println("reach end place");
saveAnswer(newTreeNode);
offspring.Clear();
return;
}
if (count==MAX_SIZE) {
answer = null;
return;
}
//get offspring of newTreeNode
offspring = generateOffspring(newTreeNode);
if (offspring != null) {
int index = checkLine(offspring[0]);
if (index >= 0) {
TreeNode endTreeNode = new TreeNode(endStop.arrayNode[index], offspring[0]);
//System.out.println("reach end place (1)");
saveAnswer(endTreeNode);
offspring.Clear();
return;
}
int offspringSize = offspring.Count();
//add offspring into OPEN
for (int i = 0; i < offspringSize; i++) {
OPEN.Insert(0, offspring[i]);
}
}
}
}
}