func (player *playerData) sendPositionLook(writer io.Writer) error {
return proto.WriteEntityTeleport(
writer,
player.entityId,
player.position.ToAbsIntXyz(),
&player.look)
}
// Generates any packets needed to update clients as to the position and
// velocity of the object.
// It assumes that the clients have either been sent packets via this method
// before, or that the previous position/velocity sent was generated from the
// LastSentPosition and LastSentVelocity attributes.
func (obj *PointObject) SendUpdate(writer io.Writer, entityId EntityId, look *LookBytes) (err error) {
curPosition := obj.position.ToAbsIntXyz()
dx := curPosition.X - obj.LastSentPosition.X
dy := curPosition.Y - obj.LastSentPosition.Y
dz := curPosition.Z - obj.LastSentPosition.Z
if dx != 0 || dy != 0 || dz != 0 {
if dx >= -128 && dx <= 127 && dy >= -128 && dy <= 127 && dz >= -128 && dz <= 127 {
err = proto.WriteEntityRelMove(
writer, entityId,
&RelMove{
RelMoveCoord(dx),
RelMoveCoord(dy),
RelMoveCoord(dz),
},
)
} else {
err = proto.WriteEntityTeleport(
writer, entityId,
curPosition, look)
}
if err != nil {
return
}
obj.LastSentPosition = *curPosition
}
curVelocity := obj.velocity.ToVelocity()
if curVelocity.X != obj.LastSentVelocity.X || curVelocity.Y != obj.LastSentVelocity.Y || curVelocity.Z != obj.LastSentVelocity.Z {
if err = proto.WriteEntityVelocity(writer, entityId, curVelocity); err != nil {
return
}
obj.LastSentVelocity = *curVelocity
}
return
}