public void PerformChase(float deltaSeconds)
{
IsHoming = false;
Body body = MyBody;
if (Target != null)
{
SpatialData worldSpatial = this.GetWorldSpatialData();
SpatialData targetSpatial = Target.GetWorldSpatialData();
Vector2 targetDelta = targetSpatial.Position - worldSpatial.Position;
targetDelta.GetDirectionAndLength(out Vector2 targetDir, out float targetDistance);
if (targetDistance > TargetRange)
{
// Don't do anything.
}
else if (targetDistance > TargetInnerRange)
{
IsHoming = true;
Vector2 velocity = targetDir * Speed;
switch (HomingType)
{
case HomingType.ConstantSpeed:
{
if (body != null)
{
if (body.IsStatic)
{
Vector2 deltaPosition = velocity * deltaSeconds;
body.Position += deltaPosition;
}
else
{
body.LinearVelocity = velocity;
}
}
else
{
Vector2 deltaPosition = velocity * deltaSeconds;
Vector2 newPosition = worldSpatial.Position + deltaPosition;
Spatial.SetWorldPosition(newPosition);
}
}
break;
case HomingType.ConstantAcceleration:
{
if (body != null)
{
Vector2 impulse = body.Mass * velocity;
body.ApplyLinearImpulse(ref impulse);
}
else
{
throw new NotImplementedException();
}
}
break;
default: throw new ArgumentException(nameof(HomingType));
}
}
}
if (DebugDrawingEnabled)
{
Global.Game.DebugDrawCommands.Add(view =>
{
Vector2 p = this.GetWorldSpatialData().Position;
view.DrawPoint(p, Conversion.ToMeters(3.0f), Color.Turquoise);
view.DrawCircle(p, TargetInnerRange, Color.Yellow);
view.DrawCircle(p, TargetRange, Color.Blue);
});
}
}