Cat and Mouse Simulation Design

State Transition Diagram

State descriptions for the cat

State	CatWander
Enter	set maximum velocity to wander level switch wander on.
Update	if the cat sees a mouse then     change state to chase-mouse state
Exit	switch wander off
Message ID	Action

State	ChaseMouse
Enter	set maximum velocity to chase level send AFTER_YOU message to mouse after half second delay switch pursuit on and target mouse
Update	if the mouse is caught     change to kill-mouse state else if the cat cannot see the mouse     change state to seek-mouse state
Exit	switch pursuit off
Message ID	Action

State	SeekMouse
Enter	set maximum speed to seek level adjust last known mouse position to fit inside cat's world domain switch arrive on and target last known mouse position
Update	if cat can see a mouse     change state to chase-mouse state if close to last known position     change to cat-wander state
Exit	switch arrive off
Message ID	Action

State	KillMouse
Enter	set velocity to zero increment number of mice killed send DIE message to the mouse send NEXT_MOUSE message to self with 2 second delaye
Update
Exit
Message ID	Action
NEXT_MOUSE	if there are mice left     change to cat-wander state else     reset the simulation to start again

 

State descriptions for the mice

State	MouseGlobal
Enter
Update
Exit
Message ID	Action
DIE	mark mouse as dead so the cat will not look for it set velocity to zero switch off all steering behaviours remove this mouse from the world after 0.5 seconds

State	MouseWander
Enter	set maximum speed to wander level switch wander on
Update	if mouse can sees the cat     change to evade-cat state
Exit	switch arrive off
Message ID	Action
AFTER_YOU	change to evade-cat state

State	EvadeCat
Enter	set maximum speed to evade level if distance from cat is > 100     switch hide on else     switch evade on
Update	if mouse cannot be seen by the cat     send SAFE_HERE message to self with 1 second delay
Exit	switch hide off switch evade off
Message ID	Action
SAFE_HERE	change to mouse-wander state