/**
* Does Dijkstra and returns the a 1d structure that can be treated as 2d
*
* @param board
* @param hero
* @return
*/
private static List<Vertex> doDijkstra(GameState.Board board, GameState.Hero hero) {
List<Vertex> vertexes = new LinkedList<Vertex>();
Vertex me = null;
// Build the graph sans edges
for (int row = 0; row < board.getSize(); row++) {
for (int col = 0; col < board.getSize(); col++) {
Vertex v = new Vertex();
GameState.Position pos = new GameState.Position(row, col);
int tileStart = row * board.getSize() * 2 + (col * 2);
v.setTileType(board.getTiles().substring(tileStart, tileStart + 1 + 1));
v.setPosition(pos);
vertexes.add(v);
}
}
// Add in the edges
for (int i = 0; i < board.getSize() * board.getSize(); i++) {
int row = i % (board.getSize());
int col = i / board.getSize();
Vertex v = vertexes.get(i);
// Check: Is this us?
if (v.getPosition().getX() == hero.getPos().getX()
&& v.getPosition().getY() == hero.getPos().getY()) me = v;
if (v.getTileType().equals("##")
|| v.getTileType().equals("[]")
|| v.getTileType().startsWith("$"))
// Impassable tiles link to nowhere.
continue;
// Make sure not to link to impassable blocks that don't have a function
// Make sure you don't link impassable blocks to other blocks (you can't go from the pub to
// somewhere else)
for (int j = col - 1; j <= col + 1; j += 2) {
if (j >= 0 && j < board.getSize()) {
Vertex adjacentV = vertexes.get(j * board.getSize() + row);
v.getAdjacencies().add(adjacentV);
}
}
for (int j = row - 1; j <= row + 1; j += 2) {
if (j >= 0 && j < board.getSize()) {
Vertex adjacentV = vertexes.get(col * board.getSize() + j);
v.getAdjacencies().add(adjacentV);
}
}
}
// Zok, we have a graph constructed. Traverse.
PriorityQueue<Vertex> vertexQueue = new PriorityQueue<Vertex>();
vertexQueue.add(me);
me.setMinDistance(0);
while (!vertexQueue.isEmpty()) {
Vertex v = vertexQueue.poll();
double distance = v.getMinDistance() + 1;
for (Vertex neighbor : v.getAdjacencies()) {
if (distance < neighbor.getMinDistance()) {
neighbor.setMinDistance(distance);
neighbor.setPrevious(v);
vertexQueue.remove(neighbor);
vertexQueue.add(neighbor);
}
}
}
return vertexes;
}
