/**
* Initialize the list of path fragments. It is able to randomly generate a game path. It
* recursively calls itself to add new path fragment to the game path until it is long enough to
* cover the width of the panel.
*
* @param int targetLength: the horizontal distance for the path to cover. PathFragment
* previousFragment, null if is the first path fragment
* @return none.
*/
private void randomPath(int targetLength, PathFragment previousFragment) {
int width = 80 + (int) (Math.random() * 100); // A random width for each
// path fragment
if (previousFragment == null) { // First path fragment
// Randomly choose a starting point on the left side of the panel
// and direction
int y = random(TowerDefenseGame.WINDOW_HEIGHT);
int direction = random(70);
PathFragment newFragment = new PathFragment(0, y, width, direction);
// Check if the new path is in bound
while (!isInBound(newFragment.getPathEnd())) {
direction = random(70);
newFragment = new PathFragment(0, y, width, direction);
}
paths.add(newFragment);
randomPath(targetLength - (int) (Math.cos(Math.toRadians(direction)) * width), newFragment);
} else if (targetLength > 0) {
int direction = randomDirection();
PathFragment newFragment;
double[] pt = previousFragment.getPathEnd();
newFragment = new PathFragment((int) pt[0], (int) pt[1], width, direction);
while (!isInBound(newFragment.getPathEnd())
|| direction == previousFragment.getDirection()
|| direction == previousFragment.getDirection() - 180
|| direction == previousFragment.getDirection() + 180) {
direction = randomDirection();
newFragment = new PathFragment((int) pt[0], (int) pt[1], width, direction);
}
paths.add(newFragment);
randomPath(targetLength - (int) (Math.cos(Math.toRadians(direction)) * width), newFragment);
}
}
/**
* Paints all the components on the game map. Towers are painted first, then the path, then all
* the enemies.
*
* @return none.
*/
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
// Draws all the towers
for (Tower tower : towers) {
tower.draw(g);
}
// Draws the path
for (PathFragment fragment : paths) {
fragment.draw(g);
}
// Draws all the enemies
for (Enemy enermy : enemies) {
enermy.draw(g);
}
}