/** Adds a new part to the end of the snake. */
public void addPart() {
numberOfParts++;
SnakePart tailPart = snakeParts.get(snakeParts.size() - 1);
SnakePart newTailPart = new SnakePart(tailPart.getX(), tailPart.getY(), snakeColor);
snakeParts.add(newTailPart);
}
@Override
public void draw(Canvas canvas) {
// draw each part of the snake.
for (int i = 0; i < numberOfParts; i++) {
SnakePart part = snakeParts.get(i);
part.draw(canvas);
}
}
/**
* Checks whether any parts overlap.
*
* @return true if parts overlap, false otherwise.
*/
public boolean checkGameOver() {
int snakeLength = snakeParts.size();
SnakePart head = snakeParts.get(0);
for (int i = 1; i < snakeLength; i++) {
SnakePart snakePart = snakeParts.get(i);
if (head.getX() == snakePart.getX() && head.getY() == snakePart.getY()) {
return true;
}
}
// check boundary conditions
if (head.getX() < 0 || head.getX() >= Utils.WORLD_WIDTH) {
// check x coordinates.
return true;
} else if (head.getY() < 0 || head.getY() >= Utils.WORLD_HEIGHT) {
// check y coordinates.
return true;
}
return false;
}
/** Move the snake forward every update. */
public void advance() {
if (currentState == State.IDLE) {
currentState = State.MOVING;
}
SnakePart head = snakeParts.get(0);
int snakeLength = snakeParts.size() - 1;
for (int i = snakeLength; i > 0; i--) {
SnakePart previousPart = snakeParts.get(i - 1);
SnakePart snakePart = snakeParts.get(i);
// set the part's new position to the previous parts position.
snakePart.setX(previousPart.getX());
snakePart.setY(previousPart.getY());
}
switch (movementDirection) {
case UP:
head.setY(head.getY() - 1);
break;
case DOWN:
head.setY(head.getY() + 1);
break;
case LEFT:
head.setX(head.getX() - 1);
break;
case RIGHT:
head.setX(head.getX() + 1);
break;
}
}
public void advance() {
SnakePart head = parts.get(0);
int len = parts.size() - 1;
for (int i = len; i > 0; i--) {
SnakePart before = parts.get(i - 1);
SnakePart part = parts.get(i);
part.x = before.x;
part.y = before.y;
}
if (direction == UP) head.y -= 1;
if (direction == LEFT) head.x -= 1;
if (direction == DOWN) head.y += 1;
if (direction == RIGHT) head.x += 1;
if (head.x < 0) head.x = 9;
if (head.x > 9) head.x = 0;
if (head.y < 0) head.y = 12;
if (head.y > 12) head.y = 0;
}