Inter- living objects protocol

Protocol

• 2 livingobjects communicate and interact via a protocol
• caller ==> callee
• caller <-- callee return
• consensus - hand shaking before making any change
• autonomous - read-only to each others' state
• any updates that affect determinism must occur no earlier than the upcoming frame transition
• this treatment is to ensure that livingobjects have equal opportunity regardless of their position on the processing pipeline
• for explanation of this problem see multi-processing

hit

• exist between all living objects
• A ==> B.hit() I hit you!
• A <-- true accept your hit (hand shaking)
• A is responsible for keeping arest or vrest, that A cannot interact with B again in a defined time interval
• B is responsible for putting itself into an effect
• B may return false under some circumstances, in such case this hit event will cause no change

catch & throw

• exists only between characters, say A catches B:
• phase a: when A's itr:kind:1 intersect with B's body, which B is in state 16
  
  • A ==> B.caught_a() I catch you!
  • B double checks whether itself is in state 16 (autonomous)
  • B transits to itr.caughtact depends on being attacked in front or at back
  • B resets fall, drops weapon and labels A as catcher
  • B returns true, and indicates being attacked in front or at back
  • A <-- true yes you caught me (hand shaking)
  • A transits to itr.catchingact depends on attacked in front or at back
  • A labels B as being caught (a channel established)
• phase b: A has a cpoint:kind:1, B has a cpoint:kind:2
  
  • A ==> B.caught_b()
  • B receives and stores A's cpoint
  • B will (in the next TU) move itself to coincide its cpoint with A's cpoint
• phase throw: when A decides to throw B
  
  • A ==> B.caught_throw()
  • B transits to cpoint.vaction or (if undefined) a default frame
  • B receives and stores A's cpoint
  • B will (in the next TU) gain velocity and an impulse, and fly away afterwards