Direction CEnemy::chooseDirection(int targetx, int targety)
{
int currentTileX = getXposition();
int currentTileY = getYposition();
// gathering distances, adding bonus distance for invert directions so they can't turn back, adding bonus if we can't move there aswell
int upWay = distance(targetx, targety, currentTileX, currentTileY - 1) + (_direction == DirectionDown ? 1000 : 0) + (ableToMove(0, -1) ? 0 : 1000);
int leftWay = distance(targetx, targety, currentTileX - 1, currentTileY) + (_direction == DirectionRight ? 1000 : 0) + (ableToMove(-1, 0) ? 0 : 1000);
int downWay = distance(targetx, targety, currentTileX, currentTileY + 1) + (_direction == DirectionUp ? 1000 : 0) + (ableToMove(0, 1) ? 0 : 1000);
int rightWay = distance(targetx, targety, currentTileX + 1, currentTileY) + (_direction == DirectionLeft ? 1000 : 0) + (ableToMove(1, 0) ? 0 : 1000);
// finding best distance, ie shortest one, ie without added bonus distances aswell
int bestDistance = min(upWay, min(leftWay, min(downWay, rightWay)));
if (upWay == bestDistance) {
return DirectionUp;
}
else if (leftWay == bestDistance) {
return DirectionLeft;
}
else if (downWay == bestDistance) {
return DirectionDown;
}
return DirectionRight;
}
void Ship2::update(unsigned long elapsed_millis) {
Ship::update(elapsed_millis);
if (_ship1->isColliding(_physics->getPosition(),_shieldrad)) {
if(_ship1->isInvincible() && isInvincible()) {
cg::Vector2d collisionPoint = cg::Vector2d( (getXposition() + _ship1->getXposition())/2 , (getYposition() + _ship1->getYposition())/2);
cg::Vector2d ship2Velocity = getVelocity();
shock(collisionPoint, 0.5 * _ship1->getMass()*length(_ship1->getVelocity()));
_ship1->shock(collisionPoint, 0.5 * _physics->getMass()*length(ship2Velocity));
return;
}
explode();
return;
}
}
void CEnemy::Update()
{
CEntity::Update(); // animation and movement stuff
// handling new movement in different states
if (!_moving && _state == EnemyStateScatter)
{
Move(chooseDirection(_scatterX, _scatterY)); // try to move to our scatter corner
}
else if (!_moving && _state == EnemyStateChase)
{
Move(chooseDirection(_chaseX, _chaseY)); // try to move to our chase position (different for every ghost)
}
else if (!_moving && _state == EnemyStateFrighten)
{
while (true) { // just move in random direction
int direction = rand() % 4;
if (!isReverse((Direction)direction)) {
Move((Direction)direction);
if (_moving) {
break;
}
}
}
}
else if (!_moving && _state == EnemyStateEyes)
{
if (getXposition() == _startX && getYposition() == _startY) {
Reset(); // reset our states when home reached
_state = EnemyStateChase;
Update(); // start chase over
}
else {
Move(chooseDirection(_startX, _startY)); // go home
}
}
}
