private void OnStartup(EntityUid uid, JitteringComponent jittering, ComponentStartup args)
{
if (!EntityManager.TryGetComponent(uid, out ISpriteComponent? sprite))
{
return;
}
var animationPlayer = EntityManager.EnsureComponent <AnimationPlayerComponent>(uid);
animationPlayer.Play(GetAnimation(jittering, sprite), _jitterAnimationKey);
}
private void OnShutdown(EntityUid uid, JitteringComponent jittering, ComponentShutdown args)
{
if (EntityManager.TryGetComponent(uid, out AnimationPlayerComponent? animationPlayer))
{
animationPlayer.Stop(_jitterAnimationKey);
}
if (EntityManager.TryGetComponent(uid, out SpriteComponent? sprite))
{
sprite.Offset = Vector2.Zero;
}
}
private void OnAnimationCompleted(EntityUid uid, JitteringComponent jittering, AnimationCompletedEvent args)
{
if (args.Key != _jitterAnimationKey)
{
return;
}
if (EntityManager.TryGetComponent(uid, out AnimationPlayerComponent? animationPlayer) &&
EntityManager.TryGetComponent(uid, out ISpriteComponent? sprite))
{
animationPlayer.Play(GetAnimation(jittering, sprite), _jitterAnimationKey);
}
}
private Animation GetAnimation(JitteringComponent jittering, ISpriteComponent sprite)
{
var amplitude = MathF.Min(4f, jittering.Amplitude / 100f + 1f) / 10f;
var offset = new Vector2(_random.NextFloat(amplitude / 4f, amplitude),
_random.NextFloat(amplitude / 4f, amplitude / 3f));
offset.X *= _random.Pick(_sign);
offset.Y *= _random.Pick(_sign);
if (Math.Sign(offset.X) == Math.Sign(jittering.LastJitter.X) ||
Math.Sign(offset.Y) == Math.Sign(jittering.LastJitter.Y))
{
// If the sign is the same as last time on both axis we flip one randomly
// to avoid jitter staying in one quadrant too much.
if (_random.Prob(0.5f))
{
offset.X *= -1;
}
else
{
offset.Y *= -1;
}
}
// Animation length shouldn't be too high so we will cap it at 2 seconds...
var length = Math.Min((1f / jittering.Frequency), 2f);
jittering.LastJitter = offset;
return(new Animation()
{
Length = TimeSpan.FromSeconds(length),
AnimationTracks =
{
new AnimationTrackComponentProperty()
{
ComponentType = typeof(ISpriteComponent),
Property = nameof(ISpriteComponent.Offset),
KeyFrames =
{
new AnimationTrackProperty.KeyFrame(sprite.Offset, 0f),
new AnimationTrackProperty.KeyFrame(offset, length),
}
}
}
});
}
