void CInterceptHandler::AddInterceptTarget(CWeaponProjectile* target, const float3& destination)
{
int targTeam = -1;
if (target->owner()) {
targTeam=target->owner()->allyteam;
}
for (std::list<CWeapon*>::iterator wi = interceptors.begin(); wi != interceptors.end(); ++wi) {
CWeapon* w = *wi;
if (((targTeam == -1) || !teamHandler->Ally(w->owner->allyteam,targTeam)) &&
(target->weaponDef->targetable & w->weaponDef->interceptor) &&
(w->weaponPos.SqDistance2D(destination) < Square(w->weaponDef->coverageRange)))
{
w->incoming.push_back(target);
w->AddDeathDependence(target, CObject::DEPENDENCE_INTERCEPT);
}
}
}
void CInterceptHandler::Update(bool forced) {
if (((gs->frameNum % UNIT_SLOWUPDATE_RATE) != 0) && !forced)
return;
std::list<CWeapon*>::iterator wit;
std::map<int, CWeaponProjectile*>::const_iterator pit;
for (wit = interceptors.begin(); wit != interceptors.end(); ++wit) {
CWeapon* w = *wit;
const WeaponDef* wDef = w->weaponDef;
const CUnit* wOwner = w->owner;
// const float3& wOwnerPos = wOwner->pos;
const float3& wPos = w->weaponPos;
assert(wDef->interceptor || wDef->isShield);
for (pit = interceptables.begin(); pit != interceptables.end(); ++pit) {
CWeaponProjectile* p = pit->second;
const WeaponDef* pDef = p->weaponDef;
if ((pDef->targetable & wDef->interceptor) == 0)
continue;
if (w->incomingProjectiles.find(p->id) != w->incomingProjectiles.end())
continue;
const CUnit* pOwner = p->owner();
const int pAllyTeam = (pOwner != NULL)? pOwner->allyteam: -1;
if (pAllyTeam != -1 && teamHandler->Ally(wOwner->allyteam, pAllyTeam))
continue;
// there are four cases when an interceptor <w> should fire at a projectile <p>:
// 1. p's target position inside w's interception circle (w's owner can move!)
// 2. p's current position inside w's interception circle
// 3. p's projected impact position inside w's interception circle
// 4. p's trajectory intersects w's interception circle
//
// these checks all need to be evaluated periodically, not just
// when a projectile is created and handed to AddInterceptTarget
const float interceptDist = w->weaponPos.distance(p->pos);
const float impactDist = ground->LineGroundCol(p->pos, p->pos + p->dir * interceptDist);
const float3& pFlightPos = p->pos;
const float3& pImpactPos = p->pos + p->dir * impactDist;
const float3& pTargetPos = p->targetPos;
if ((pTargetPos - wPos).SqLength2D() < Square(wDef->coverageRange)) {
w->AddDeathDependence(p, CObject::DEPENDENCE_INTERCEPT);
w->incomingProjectiles[p->id] = p;
continue; // 1
}
if (wDef->interceptor == 1) {
// <w> is just a static interceptor and fires only at projectiles
// TARGETED within its current interception area; any projectiles
// CROSSING its interception area are fired at only if interceptor
// is >= 2
continue;
}
if ((pFlightPos - wPos).SqLength2D() < Square(wDef->coverageRange)) {
w->AddDeathDependence(p, CObject::DEPENDENCE_INTERCEPT);
w->incomingProjectiles[p->id] = p;
continue; // 2
}
if ((pImpactPos - wPos).SqLength2D() < Square(wDef->coverageRange)) {
const float3 pTargetDir = (pTargetPos - pFlightPos).SafeNormalize();
const float3 pImpactDir = (pImpactPos - pFlightPos).SafeNormalize();
// the projected impact position can briefly shift into the covered
// area during transition from vertical to horizontal flight, so we
// perform an extra test (NOTE: assumes non-parabolic trajectory)
if (pTargetDir.dot(pImpactDir) >= 0.999f) {
w->AddDeathDependence(p, CObject::DEPENDENCE_INTERCEPT);
w->incomingProjectiles[p->id] = p;
continue; // 3
}
}
const float3 pCurSeparationVec = wPos - pFlightPos;
const float pMinSeparationDist = std::max(pCurSeparationVec.dot(p->dir), 0.0f);
const float3 pMinSeparationPos = pFlightPos + (p->dir * pMinSeparationDist);
const float3 pMinSeparationVec = wPos - pMinSeparationPos;
if (pMinSeparationVec.SqLength() < Square(wDef->coverageRange)) {
w->AddDeathDependence(p, CObject::DEPENDENCE_INTERCEPT);
w->incomingProjectiles[p->id] = p;
continue; // 4
}
}
}
}