Perception - Learning Game AI Programming with Lua - page 505

Creating event handlers
Now that agents on the same team are sending out sight events, we need to start processing
them so that agents will share the same information. When a new enemy is sighted, we can
update the blackboard and overwrite any stale information we already have about known
enemies:
AgentSenses.lua :
local function HandleEnemySightedEvent(
userData, eventType, event)
local blackboard = userData.blackboard;
local knownAgents =
userData.blackboard:Get("visibleAgents") or {};
knownAgents[event.agent:GetId()] = event;
userData.blackboard:Set("visibleAgents", knownAgents);
end
If a dead body is found, we'll erase the current information from the visibleAgents
blackboard entry so that visibleAgents will only contain known living enemies, and
any known dead enemies are added to the deadEnemies blackboard entry:
AgentSenses.lua :
local function HandleDeadEnemySightedEvent(
userData, eventType, event)
local blackboard = userData.blackboard;
local knownAgents =
userData.blackboard:Get("visibleAgents") or {};
local knownBodies =
userData.blackboard:Get("deadEnemies") or {};
knownAgents[event.agent:GetId()] = nil;
knownBodies[event.agent:GetId()] = event;
userData.blackboard:Set("visibleAgents", knownAgents);