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/**
AI Target Finding
Functionality that helps the AI to find targets to attack.
@author Sven2, Maikel
*/
public func FindTarget(effect fx)
{
// Consider hostile clonks, or all clonks if the AI does not have an owner.
var hostile_criteria = Find_Hostile(fx.Target->GetOwner());
if (fx.Target->GetOwner() == NO_OWNER)
hostile_criteria = Find_Not(Find_Owner(fx.Target->GetOwner()));
for (var target in fx.Target->FindObjects(Find_InRect(fx.guard_range.x - fx.Target->GetX(), fx.guard_range.y - fx.Target->GetY(), fx.guard_range.wdt, fx.guard_range.hgt), Find_OCF(OCF_CrewMember), hostile_criteria, Find_NoContainer(), Sort_Random()))
if (fx.ranged || PathFree(fx.Target->GetX(), fx.Target->GetY(), target->GetX(), target->GetY()))
if (this->HasWeaponForTarget(fx, target))
return target;
// Nothing found.
return;
}
public func FindEmergencyTarget(effect fx)
{
// Consider hostile clonks, or all clonks if the AI does not have an owner.
var hostile_criteria = Find_Hostile(fx.Target->GetOwner());
if (fx.Target->GetOwner() == NO_OWNER)
hostile_criteria = Find_Not(Find_Owner(fx.Target->GetOwner()));
// Search nearest enemy clonk in area even if not in guard range, used e.g. when outside guard range (AI fell down) and being attacked.
for (var target in fx.Target->FindObjects(Find_Distance(200), Find_OCF(OCF_CrewMember), hostile_criteria, Find_NoContainer(), Sort_Distance()))
if (PathFree(fx.Target->GetX(), fx.Target->GetY(), target->GetX(), target->GetY()))
if (this->HasWeaponForTarget(fx, target))
return target;
// Nothing found.
return;
}
public func CheckTargetInGuardRange(effect fx)
{
// If target is not in guard range, reset it and return false.
if (!Inside(fx.target->GetX() - fx.guard_range.x, -10, fx.guard_range.wdt + 9) || !Inside(fx.target->GetY() - fx.guard_range.y, -10, fx.guard_range.hgt + 9))
{
if (ObjectDistance(fx.target) > 250)
{
fx.target = nil;
return false;
}
}
return true;
}
// Checks whether the AI has a weapon for the target.
public func HasWeaponForTarget(effect fx, object target)
{
target = target ?? fx.target;
// Already has a weapon, or a vehicle
if (fx.weapon && this->IsWeaponForTarget(fx, fx.weapon, target))
return true;
// Look for weapons in the inventory
for (var weapon in FindObjects(Find_Container(fx.Target)))
if (this->IsWeaponForTarget(fx, weapon, target))
return true;
return false;
}
// Returns whether a weapon can be used for a certain target.
public func IsWeaponForTarget(effect fx, object weapon, object target)
{
weapon = weapon ?? fx.weapon;
target = target ?? fx.target;
if (!weapon || !target)
return false;
// If on a vehicle forward behavior.
if (fx.vehicle)
return this->IsVehicleForTarget(fx, fx.vehicle, target);
// Assume that all weapons can attack living targets.
if (target->GetAlive())
return true;
// Structures and vehicles can only be attacked by explosives.
var cat_target = target->GetCategory();
if ((cat_target & C4D_Structure) || (cat_target & C4D_Vehicle))
{
if (weapon->~IsExplosive())
return true;
}
// Weapon is unable to attack current target.
return false;
}
// Returns whether a weapon can be used for a certain target.
public func IsVehicleForTarget(effect fx, object vehicle, object target)
{
vehicle = vehicle ?? fx.vehicle;
target = target ?? fx.target;
if (!vehicle || !target)
return false;
// Airships may board everywhere.
if (vehicle->GetID() == Airship)
return true;
// Catapult may fire at everything.
if (vehicle->GetID() == Catapult)
return true;
// Airplanes can attack anything a priori.
if (vehicle->GetID() == Airplane)
return true;
return false;
}
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