Perception - Learning Game AI Programming with Lua - page 512

Handling auditory events
Handling auditory events requires you to add additional time-to-live information to each
stored event. As a large number of bullet shots and impacts events are emitted, the time-to-
live information will be used to prune out old events:
AgentSenses.lua :
local function HandleBulletImpactEvent(
userData, eventType, event)
local blackboard = userData.blackboard;
local bulletImpacts = blackboard:Get("bulletImpacts") or
{};
table.insert(
bulletImpacts,
{ position = event.position, ttl = 1000 });
blackboard:Set("bulletImpacts", bulletImpacts);
end
local function HandleBulletShotEvent(userData, eventType,
event)
local blackboard = userData.blackboard;
local bulletShots = blackboard:Get("bulletShots") or {};
table.insert(
bulletShots,
{ position = event.position, ttl = 1000 });
blackboard:Set("bulletShots", bulletShots);
end
We can now add our auditory event handlers during the AgentSenses initialization:
AgentSenses.lua :
function AgentSenses_InitializeSenses(userData)
local eventCallbacks = {};