public override void Update(GameTime gameTime, GameEngine.TeeEngine engine)
{
// Get the Hero player for interaction purposes.
Hero player = (Hero)engine.GetEntity("Player");
Vector2 prevPos = Pos;
AttackTarget = player;
// Check if this Bat has died.
if (HP <= 0)
{
this.Opacity -= 0.02f;
this.Drawables.ResetState(CurrentDrawableState, gameTime);
if (this.Opacity < 0)
{
if (!_goldGiven) SpawnCoins(engine);
engine.RemoveEntity(this);
}
}
else
{
// ATTACKING LOGIC.
if (Stance == AttackStance.Attacking)
{
this.Pos.X -= (float)(Math.Cos(_attackAngle) * _attackSpeed);
this.Pos.Y -= (float)(Math.Sin(_attackAngle) * _attackSpeed);
this._attackHeight.Y += 30.0f / ATTACK_COUNTER_LIMIT;
this.Drawables.SetGroupProperty("Body", "Offset", _attackHeight);
onAttack(engine, gameTime);
}
// ATTACK PREPERATION LOGIC.
else if (Stance == AttackStance.Preparing)
{
_attackHeight.Y -= 2;
if (_attackHeight.Y < -40)
{
_attackHeight.Y = -40;
_attackAngle = Math.Atan2(
this.Pos.Y - player.Pos.Y,
this.Pos.X - player.Pos.X
);
Stance = AttackStance.Attacking;
_attackCounter = 0;
}
Drawables.SetGroupProperty("Body", "Offset", _attackHeight);
}
// NON-ATTACKING LOGIC. PATROL AND APPROACH.
else if (Stance == AttackStance.NotAttacking)
{
double distance = Vector2.Distance(player.Pos, this.Pos);
if (distance < AggroDistance && player.HP > 0)
{
// Move towards the player for an attack move.
double angle = Math.Atan2(
player.Pos.Y - this.Pos.Y,
player.Pos.X - this.Pos.X
);
// Approach Function.
double moveValue;
if (distance < AttackDistance)
{
Stance = AttackStance.Preparing;
moveValue = 0;
}
else
moveValue = _moveSpeed;
Pos.X += (float)(Math.Cos(angle) * moveValue);
Pos.Y += (float)(Math.Sin(angle) * moveValue);
}
else
{
// Perform a standard patrol action.
Pos.X += (float)(Math.Cos(gameTime.TotalGameTime.TotalSeconds - _randomModifier * 90) * 2);
}
}
else if (Stance == AttackStance.Retreating)
{
double distance = Vector2.Distance(player.Pos, this.Pos);
if (distance < AggroDistance * 1.10)
{
if (_attackHeight.Y < -10)
{
_attackHeight.Y += 0.4f;
if (_attackHeight.Y > -10)
_attackHeight.Y = -10;
Drawables.SetGroupProperty("Body", "Offset", _attackHeight);
}
double angle = Math.Atan2(
player.Pos.Y - this.Pos.Y,
player.Pos.X - this.Pos.X
);
Pos.X += (float)(Math.Cos(angle) * -(_moveSpeed * 0.8f));
Pos.Y += (float)(Math.Sin(angle) * -(_moveSpeed * 0.8f));
}
else
{
Stance = AttackStance.NotAttacking;
if (_attackHeight.Y < -10) _attackHeight.Y = -10;
Drawables.SetGroupProperty("Body", "Offset", _attackHeight);
}
}
// Determine the animation based on the change in position.
if (Math.Abs(prevPos.X - Pos.X) > Math.Abs(prevPos.Y - Pos.Y))
{
if (prevPos.X < Pos.X)
this.CurrentDrawableState = Prefix + "Right";
if (prevPos.X > Pos.X)
this.CurrentDrawableState = Prefix + "Left";
}
else
{
if (prevPos.Y < Pos.Y)
this.CurrentDrawableState = Prefix + "Down";
if (prevPos.Y > Pos.Y)
this.CurrentDrawableState = Prefix + "Up";
}
}
base.Update(gameTime, engine);
}