/**
* When saving a map, we are looping through the map that was built and adding the fixed roads to
* a new map. To prevent adding the same bits of roads again, delete all the bits from the already
* added road
*
* @param oldMap the map from which to delete some number of components
* @param start the start coordinate from where to begin deleting components
* @param end the end coordinate to which we must delete all components
*/
private void deleteFromOldMap(Map oldMap, Coordinate start, Coordinate end) {
int startX = start.getX();
int startY = start.getY();
int endX = end.getX();
int endY = end.getY();
if (startY == endY) { // horizontal
for (int i = startX; i <= endX; i++) {
oldMap.clearCell(new Coordinate(i, startY));
}
} else { // vertical
for (int i = startY; i <= endY; i++) {
oldMap.clearCell(new Coordinate(startX, i));
}
}
}
/**
* Takes a map with disconnected Roads and Intersections and connects them. This is like
* connecting nodes (intersections) to edges (roads) in a directed graph.
*
* @param fixed the map where components need to be connected
*/
private void assignIntersectionsToRoads(Map fixed) throws Exception {
ArrayList<Intersection> intersections = fixed.getIntersections();
for (int i = 0; i < intersections.size(); i++) {
Intersection current = intersections.get(i);
Coordinate coord = current.getLocation();
int x = coord.getX();
int y = coord.getY();
Coordinate north = (y - 1 >= 0) ? new Coordinate(x, y - 1) : null;
Coordinate south = (y + 1 < height) ? new Coordinate(x, y + 1) : null;
Coordinate east = (x + 1 < width) ? new Coordinate(x + 1, y) : null;
Coordinate west = (x - 1 >= 0) ? new Coordinate(x - 1, y) : null;
if (north != null) {
Component component = fixed.getAtLocation(north);
if (component instanceof Road) {
current.setNorthRoad((Road) component);
}
}
if (south != null) {
Component component = fixed.getAtLocation(south);
if (component instanceof Road) {
current.setSouthRoad((Road) component);
}
}
if (east != null) {
Component component = fixed.getAtLocation(east);
if (component instanceof Road) {
current.setEastRoad((Road) component);
}
}
if (west != null) {
Component component = fixed.getAtLocation(west);
if (component instanceof Road) {
current.setWestRoad((Road) component);
}
}
current.setDefaultTrafficLightsForRoads();
}
}
/**
* Build the map that the user drew into a complete and connected map
*
* @param map the map that the user built
* @return a fixed map that has all roads and intersections connected
* @throws Exception
*/
private Map buildAndSaveMap(Map map) throws Exception {
System.out.println("Building and saving map...");
int width = map.getWidth();
int height = map.getHeight();
Map fixed = new Map(width, height);
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
Component current = map.getGrid().get(x, y);
if (current instanceof Intersection) {
Coordinate location = new Coordinate(x, y);
Intersection i = new Intersection(location);
fixed.addIntersection(i);
deleteFromOldMap(map, location, location);
} else if (current instanceof Road) {
Road road = (Road) current;
Coordinate lastKnownCoord = road.getEndLocation();
if (road.runsVertically()) {
if (lastKnownCoord.getY() != height - 1) {
Component next = map.getGrid().get(x, y++);
while (next != null && next instanceof Road) {
lastKnownCoord = ((Road) next).getEndLocation();
if (y == height) break;
next = map.getGrid().get(x, y++);
}
y = road.getStartLocation().getY(); // go back to the row we started at
}
Coordinate start = road.getStartLocation();
Coordinate end = lastKnownCoord;
Road newRoad = new Road(start, end);
newRoad.addLane(new Lane(end, start, MapDirection.NORTH));
newRoad.addLane(new Lane(start, end, MapDirection.SOUTH));
fixed.addRoad(newRoad);
deleteFromOldMap(map, start, end);
} else {
if (lastKnownCoord.getX() != width - 1) {
Component next = map.getGrid().get(x++, y);
while (next != null && next instanceof Road) {
lastKnownCoord = ((Road) next).getEndLocation();
if (x == width) break;
next = map.getGrid().get(x++, y);
}
x =
x
- 2; // we overshot by 1, so go back, and loop will increment, so go back
// another
}
Coordinate start = road.getStartLocation();
Coordinate end = lastKnownCoord;
Road newRoad = new Road(start, end);
newRoad.addLane(new Lane(start, end, MapDirection.EAST));
newRoad.addLane(new Lane(end, start, MapDirection.WEST));
fixed.addRoad(newRoad);
deleteFromOldMap(map, start, end);
}
}
}
}
assignIntersectionsToRoads(fixed);
return fixed;
}