void defend()
{
var center = GetCenter();
var data = properties.UpgradeData;
if (lockOnEnemy != null)
{
if (lockOnEnemy.IsRemoved)
{
lockOnEnemy = null;
return;
}
var distance = Vector2.DistanceSquared(center, lockOnEnemy.Position);
var min = properties.MinRange * properties.MinRange;
var max = data.Range * data.Range;
if (distance < min || distance > max)
{
lockOnEnemy = null;
return;
}
var barrel = position + properties.GridOffset +
properties.BarrelOffset;
var enemy = lockOnEnemy.GetAttackOffset();
var angle = (float)Math.Atan2(barrel.Y - enemy.Y,
barrel.X - enemy.X) + MathHelper.ToRadians(90);
setTowerAngle(angle);
shootBullet(enemy);
}
else
{
var enemies = world.GetEntitiesInRange(
center,
data.Range,
EntityType.AI);
if (enemies.Count == 0)
{
return;
}
lockOnEnemy = (EnemyEntity)enemies[0];
}
}
