private void HandleEntityData(EntityDataPacket p, float serverDeltaTime = 0)
{
Entity e = this.entityWorld.EntityManager.GetEntity(p.EntityId);
if (e != null)
{
TransformComponent transform = e.GetComponent <TransformComponent>();
System.Diagnostics.Debug.Assert(transform != null, transform.GetType() + " not found");
// TODO: better client side prediction:
/* position + (velocity * network_latency)
* position + (velocity * network_latency) + (acceleration * network_latency^2) / 2
* might be inaccurate, due to high possible latency, > 100ms
*
* latency too high: extrapolate position using above (dead reckoning)?
* latency in acceptable range: lerp predicted position and received position
*/
// adjust velocity continuosly, unless difference is too big, then change position
float deltaValue = 30f; //pixel (unit; due to new scale) offset
Vector2 dataPosition = new Vector2(p.PositionX, p.PositionY);
if (!this.IsInbetween(transform.Position.X, dataPosition.X, deltaValue) || !this.IsInbetween(transform.Position.Y, dataPosition.Y, deltaValue))
{
transform.Position = dataPosition;
}
if (!this.IsInbetween(transform.Rotation, p.Rotation, deltaValue / 120f))
{
transform.Rotation = p.Rotation;
}
MotionComponent motion = e.GetComponent <MotionComponent>();
if (motion != null)
{
motion.Velocity = new Vector2(p.VelocityX, p.VelocityY);
motion.AngularVelocity = p.AngularVelocity;
//serverDeltaTime = serverDeltaTime; //time in totalseconds
float convergeFactor = 0.1f; //percentage for adding velocity so that mismatched position catches up
motion.Velocity += new Vector2((dataPosition.X - transform.Position.X) * convergeFactor * 100, (dataPosition.Y - transform.Position.Y) * convergeFactor * 100);
motion.AngularVelocity += ((p.Rotation - transform.Rotation) * convergeFactor * 100);
}
}
}
private EntityDataPacket CreateEntityStatePacket(Entity e)
{
EntityDataPacket p = new EntityDataPacket();
TransformComponent position = e.GetComponent <TransformComponent>();
p.EntityId = e.EntityId;
p.PositionX = position.Position.X;
p.PositionY = position.Position.Y;
p.Rotation = position.Rotation;
MotionComponent motion = e.GetComponent <MotionComponent>();
if (motion != null)
{
p.VelocityX = motion.Velocity.X;
p.VelocityY = motion.Velocity.Y;
p.AngularVelocity = motion.AngularVelocity;
}
return(p);
}
