public int compare(State left, State right) {
if (left.getX() < right.getX()) {
return -1;
} else if (left.getX() > right.getX()) {
return 1;
} else if (left.getY() < right.getY()) {
return -1;
} else if (left.getY() > right.getY()) {
return 1;
} else {
return 0;
}
}
public boolean isEquals(State test) {
if ((x == test.getX()) && (y == test.getY())) {
return true;
} else {
return false;
}
}
public void drawPath() {
State currentState = goalState;
while (currentState.parent != null) {
newImage.setRGB(currentState.getX(), currentState.getY(), 0xFFFF0000);
currentState = currentState.parent;
}
;
}
public int findPath(Logger logger) {
int x;
int y;
int cost = 0;
Color c;
State tempState;
int iterations = 0;
stateQueue.add(startState);
beenThere.add(startState);
while (stateQueue.size() > 0) {
State currentState = stateQueue.remove();
if (currentState.isEquals(goalState)) {
goalState.parent = currentState.parent;
return currentState.getCost();
}
x = currentState.getX();
y = currentState.getY();
if (iterations++ % 5000 < 1000) {
newImage.setRGB(x, y, 0xff00ff00);
} else {
newImage.setRGB(x, y, board.getRGB(x, y));
}
// look up
if (x != 0) {
State upState = new State(x - 1, y);
c = new Color(board.getRGB(x - 1, y));
cost = c.getGreen();
if (beenThere.contains(upState)) {
tempState = beenThere.floor(upState);
if (currentState.getCost() + cost < tempState.getCost()) {
tempState.setCost(currentState.getCost() + cost);
tempState.parent = currentState;
}
} else {
upState.setCost(currentState.getCost() + cost);
upState.parent = currentState;
stateQueue.add(upState);
beenThere.add(upState);
}
}
// look down
if (x < (height - 1)) {
State downState = new State(x + 1, y);
c = new Color(board.getRGB(x + 1, y));
cost = c.getGreen();
if (beenThere.contains(downState)) {
tempState = beenThere.floor(downState);
if (currentState.getCost() + cost < tempState.getCost()) {
tempState.setCost(currentState.getCost() + cost);
tempState.parent = currentState;
}
} else {
downState.setCost(currentState.getCost() + cost);
downState.parent = currentState;
stateQueue.add(downState);
beenThere.add(downState);
}
}
// look left
if (y != 0) {
State leftState = new State(x, y - 1);
c = new Color(board.getRGB(x, y - 1));
cost = c.getGreen();
if (beenThere.contains(leftState)) {
tempState = beenThere.floor(leftState);
if (currentState.getCost() + cost < tempState.getCost()) {
tempState.setCost(currentState.getCost() + cost);
tempState.parent = currentState;
}
} else {
leftState.setCost(currentState.getCost() + cost);
leftState.parent = currentState;
stateQueue.add(leftState);
beenThere.add(leftState);
}
}
if (y < (width - 1)) {
State rightState = new State(x, y + 1);
c = new Color(board.getRGB(x, y + 1));
cost = c.getGreen();
if (beenThere.contains(rightState)) {
tempState = beenThere.floor(rightState);
if (currentState.getCost() + cost < tempState.getCost()) {
tempState.setCost(currentState.getCost() + cost);
tempState.parent = currentState;
}
} else {
rightState.setCost(currentState.getCost() + cost);
rightState.parent = currentState;
stateQueue.add(rightState);
beenThere.add(rightState);
}
}
}
return -1;
}
