Exemple #1
0
/**
* @brief Causes this CMobileCAI to execute the attack order c
*/
void CMobileCAI::ExecuteAttack(Command &c)
{
	assert(owner->unitDef->canAttack);

	// limit how far away we fly
	if (tempOrder && (owner->moveState < 2) && orderTarget
			&& LinePointDist(ClosestPointOnLine(commandPos1, commandPos2, owner->pos),
					commandPos2, orderTarget->pos)
			> (500 * owner->moveState + owner->maxRange)) {
		StopMove();
		FinishCommand();
		return;
	}

	// check if we are in direct command of attacker
	if (!inCommand) {
		// don't start counting until the owner->AttackGround() order is given
		owner->commandShotCount = -1;

		if (c.params.size() == 1) {
			CUnit* targetUnit = uh->GetUnit(c.params[0]);

			// check if we have valid target parameter and that we aren't attacking ourselves
			if (targetUnit != NULL && targetUnit != owner) {
				float3 fix = targetUnit->pos + owner->posErrorVector * 128;
				float3 diff = float3(fix - owner->pos).Normalize();

				SetGoal(fix - diff * targetUnit->radius, owner->pos);

				orderTarget = targetUnit;
				AddDeathDependence(orderTarget);
				inCommand = true;
			} else {
				// unit may not fire on itself, cancel order
				StopMove();
				FinishCommand();
				return;
			}
		}
		else if (c.params.size() >= 3) {
			// user gave force-fire attack command
			float3 pos(c.params[0], c.params[1], c.params[2]);
			SetGoal(pos, owner->pos);
			inCommand = true;
		}
	}
	else if ((c.params.size() == 3) && (owner->commandShotCount > 0) && (commandQue.size() > 1)) {
		// the trailing CMD_SET_WANTED_MAX_SPEED in a command pair does not count
		if ((commandQue.size() > 2) || (commandQue.back().id != CMD_SET_WANTED_MAX_SPEED)) {
			StopMove();
			FinishCommand();
			return;
		}
	}

	// if our target is dead or we lost it then stop attacking
	// NOTE: unit should actually just continue to target area!
	if (targetDied || (c.params.size() == 1 && UpdateTargetLostTimer(int(c.params[0])) == 0)) {
		// cancel keeppointingto
		StopMove();
		FinishCommand();
		return;
	}


	// user clicked on enemy unit (note that we handle aircrafts slightly differently)
	if (orderTarget) {
		//bool b1 = owner->AttackUnit(orderTarget, c.id == CMD_DGUN);
		bool b2 = false;
		bool b3 = false;
		bool b4 = false;
		float edgeFactor = 0.f; // percent offset to target center
		float3 diff = owner->pos - orderTarget->midPos;

		if (owner->weapons.size() > 0) {
			if (!(c.options & ALT_KEY) && SkipParalyzeTarget(orderTarget)) {
				StopMove();
				FinishCommand();
				return;
			}
			CWeapon* w = owner->weapons.front();
			// if we have at least one weapon then check if we
			// can hit target with our first (meanest) one
			b2 = w->TryTargetRotate(orderTarget, c.id == CMD_DGUN);
			b3 = Square(w->range - (w->relWeaponPos).Length())
					> (orderTarget->pos.SqDistance(owner->pos));
			b4 = w->TryTargetHeading(GetHeadingFromVector(-diff.x, -diff.z),
					orderTarget->pos, orderTarget != NULL, orderTarget);
			edgeFactor = fabs(w->targetBorder);
		}

		float diffLength2d = diff.Length2D();

		// if w->AttackUnit() returned true then we are already
		// in range with our biggest weapon so stop moving
		// also make sure that we're not locked in close-in/in-range state loop
		// due to rotates invoked by in-range or out-of-range states
		if (b2) {
			if (!(tempOrder && owner->moveState == 0)
				&& (diffLength2d * 1.4f > owner->maxRange
					- orderTarget->speed.SqLength()
							/ owner->unitDef->maxAcc)
				&& b4 && diff.dot(orderTarget->speed) < 0)
			{
				SetGoal(owner->pos + (orderTarget->speed * 80), owner->pos,
						SQUARE_SIZE, orderTarget->speed.Length() * 1.1f);
			} else {
				StopMove();
				// FIXME kill magic frame number
				if (gs->frameNum > lastCloseInTry + MAX_CLOSE_IN_RETRY_TICKS) {
					owner->moveType->KeepPointingTo(orderTarget->midPos,
							std::min((float) owner->losRadius * loshandler->losDiv,
								owner->maxRange * 0.9f), true);
				}
			}
			owner->AttackUnit(orderTarget, c.id == CMD_DGUN);
		}

		// if we're on hold pos in a temporary order, then none of the close-in
		// code below should run, and the attack command is cancelled.
		else if (tempOrder && owner->moveState == 0) {
			StopMove();
			FinishCommand();
			return;
		}

		// if ((our movetype has type TAAirMoveType and length of 2D vector from us to target
		// less than 90% of our maximum range) OR squared length of 2D vector from us to target
		// less than 1024) then we are close enough
		else if(diffLength2d < (owner->maxRange * 0.9f)){
			if (dynamic_cast<CTAAirMoveType*>(owner->moveType)
					|| (diff.SqLength2D() < 1024))
			{
				StopMove();
				owner->moveType->KeepPointingTo(orderTarget->midPos,
						std::min((float) owner->losRadius * loshandler->losDiv,
							owner->maxRange * 0.9f), true);
			}

			// if (((first weapon range minus first weapon length greater than distance to target)
			// and length of 2D vector from us to target less than 90% of our maximum range)
			// then we are close enough, but need to move sideways to get a shot.
			//assumption is flawed: The unit may be aiming or otherwise unable to shoot
			else if (owner->unitDef->strafeToAttack && b3 && diffLength2d < (owner->maxRange * 0.9f))
			{
				moveDir ^= (owner->moveType->progressState == AMoveType::Failed);
				float sin = moveDir ? 3.0/5 : -3.0/5;
				float cos = 4.0/5;
				float3 goalDiff(0, 0, 0);
				goalDiff.x = diff.dot(float3(cos, 0, -sin));
				goalDiff.z = diff.dot(float3(sin, 0, cos));
				goalDiff *= (diffLength2d < (owner->maxRange * 0.3f)) ? 1/cos : cos;
				goalDiff += orderTarget->pos;
				SetGoal(goalDiff, owner->pos);
			}
		}

		// if 2D distance of (target position plus attacker error vector times 128)
		// to goal position greater than
		// (10 plus 20% of 2D distance between attacker and target) then we need to close
		// in on target more
		else if ((orderTarget->pos + owner->posErrorVector * 128).SqDistance2D(goalPos)
				> Square(10 + orderTarget->pos.distance2D(owner->pos) * 0.2f)) {
			// if the target isn't in LOS, go to its approximate position
			// otherwise try to go precisely to the target
			// this should fix issues with low range weapons (mainly melee)
			float3 fix = orderTarget->pos +
					(orderTarget->losStatus[owner->allyteam] & LOS_INLOS ?
						float3(0.f,0.f,0.f) :
						owner->posErrorVector * 128);
			float3 norm = float3(fix - owner->pos).Normalize();
			float3 goal = fix - norm*(orderTarget->radius*edgeFactor*0.8f);
			SetGoal(goal, owner->pos);
			if (lastCloseInTry < gs->frameNum + MAX_CLOSE_IN_RETRY_TICKS)
				lastCloseInTry = gs->frameNum;
		}
	}

	// user is attacking ground
	else if (c.params.size() >= 3) {
		const float3 pos(c.params[0], c.params[1], c.params[2]);
		const float3 diff = owner->pos - pos;

		if (owner->weapons.size() > 0) {
			// if we have at least one weapon then check if
			// we can hit position with our first (assumed
			// to be meanest) one
			CWeapon* w = owner->weapons.front();

			// XXX hack - dgun overrides any checks
			if (c.id == CMD_DGUN) {
				float rr = owner->maxRange * owner->maxRange;

				for (vector<CWeapon*>::iterator it = owner->weapons.begin();
						it != owner->weapons.end(); ++it) {

					if (dynamic_cast<CDGunWeapon*>(*it))
						rr = (*it)->range * (*it)->range;
				}

				if (diff.SqLength() < rr) {
					StopMove();
					owner->AttackGround(pos, c.id == CMD_DGUN);
					owner->moveType->KeepPointingTo(pos, owner->maxRange * 0.9f, true);
				}
			} else {
				const bool inAngle = w->TryTargetRotate(pos, c.id == CMD_DGUN);
				const bool inRange = diff.SqLength2D() < Square(w->range - (w->relWeaponPos).Length2D());

				if (inAngle || inRange) {
					StopMove();
					owner->AttackGround(pos, c.id == CMD_DGUN);
					owner->moveType->KeepPointingTo(pos, owner->maxRange * 0.9f, true);
				}
			}
		}

		else if (diff.SqLength2D() < 1024) {
			StopMove();
			owner->moveType->KeepPointingTo(pos, owner->maxRange * 0.9f, true);
		}

		// if we are more than 10 units distant from target position then keeping moving closer
		else if (pos.SqDistance2D(goalPos) > 100) {
			SetGoal(pos, owner->pos);
		}
	}
}
Exemple #2
0
void CMobileCAI::ExecuteAttack(Command &c)
{
	assert(owner->unitDef->canAttack);

	// limit how far away we fly based on our movestate
	if (tempOrder && orderTarget) {
		const float3& closestPos = ClosestPointOnLine(commandPos1, commandPos2, owner->pos);
		const float curTargetDist = LinePointDist(closestPos, commandPos2, orderTarget->pos);
		const float maxTargetDist = (500 * owner->moveState + owner->maxRange);

		if (owner->moveState < MOVESTATE_ROAM && curTargetDist > maxTargetDist) {
			StopMove();
			FinishCommand();
			return;
		}
	}

	// check if we are in direct command of attacker
	if (!inCommand) {
		if (c.params.size() == 1) {
			CUnit* targetUnit = unitHandler->GetUnit(c.params[0]);

			// check if we have valid target parameter and that we aren't attacking ourselves
			if (targetUnit == NULL) { StopMove(); FinishCommand(); return; }
			if (targetUnit == owner) { StopMove(); FinishCommand(); return; }
			if (targetUnit->GetTransporter() != NULL && !modInfo.targetableTransportedUnits) {
				StopMove(); FinishCommand(); return;
			}

			const float3 tgtErrPos = targetUnit->pos + owner->posErrorVector * 128;
			const float3 tgtPosDir = (tgtErrPos - owner->pos).Normalize();

			SetGoal(tgtErrPos - tgtPosDir * targetUnit->radius, owner->pos);
			SetOrderTarget(targetUnit);
			owner->AttackUnit(targetUnit, (c.options & INTERNAL_ORDER) == 0, c.GetID() == CMD_MANUALFIRE);

			inCommand = true;
		}
		else if (c.params.size() >= 3) {
			// user gave force-fire attack command
			SetGoal(c.GetPos(0), owner->pos);

			inCommand = true;
		}
	}

	// if our target is dead or we lost it then stop attacking
	// NOTE: unit should actually just continue to target area!
	if (targetDied || (c.params.size() == 1 && UpdateTargetLostTimer(int(c.params[0])) == 0)) {
		// cancel keeppointingto
		StopMove();
		FinishCommand();
		return;
	}


	// user clicked on enemy unit (note that we handle aircrafts slightly differently)
	if (orderTarget != NULL) {
		bool tryTargetRotate  = false;
		bool tryTargetHeading = false;

		float edgeFactor = 0.0f; // percent offset to target center
		const float3 targetMidPosVec = owner->midPos - orderTarget->midPos;

		const float targetGoalDist = (orderTarget->pos + owner->posErrorVector * 128.0f).SqDistance2D(goalPos);
		const float targetPosDist = Square(10.0f + orderTarget->pos.distance2D(owner->pos) * 0.2f);
		const float minPointingDist = std::min(1.0f * owner->losRadius * loshandler->losDiv, owner->maxRange * 0.9f);

		// FIXME? targetMidPosMaxDist is 3D, but compared with a 2D value
		const float targetMidPosDist2D = targetMidPosVec.Length2D();
		//const float targetMidPosMaxDist = owner->maxRange - (orderTarget->speed.SqLength() / owner->unitDef->maxAcc);

		if (!owner->weapons.empty()) {
			if (!(c.options & ALT_KEY) && SkipParalyzeTarget(orderTarget)) {
				StopMove();
				FinishCommand();
				return;
			}
		}

		for (unsigned int wNum = 0; wNum < owner->weapons.size(); wNum++) {
			CWeapon* w = owner->weapons[wNum];

			if (c.GetID() == CMD_MANUALFIRE) {
				assert(owner->unitDef->canManualFire);

				if (!w->weaponDef->manualfire) {
					continue;
				}
			}

			tryTargetRotate  = w->TryTargetRotate(orderTarget, (c.options & INTERNAL_ORDER) == 0);
			tryTargetHeading = w->TryTargetHeading(GetHeadingFromVector(-targetMidPosVec.x, -targetMidPosVec.z), orderTarget->pos, orderTarget != NULL, orderTarget);

			if (tryTargetRotate || tryTargetHeading)
				break;

			edgeFactor = math::fabs(w->targetBorder);
		}


		// if w->AttackUnit() returned true then we are already
		// in range with our biggest (?) weapon, so stop moving
		// also make sure that we're not locked in close-in/in-range state loop
		// due to rotates invoked by in-range or out-of-range states
		if (tryTargetRotate) {
			const bool canChaseTarget = (!tempOrder || owner->moveState != MOVESTATE_HOLDPOS);
			const bool targetBehind = (targetMidPosVec.dot(orderTarget->speed) < 0.0f);

			if (canChaseTarget && tryTargetHeading && targetBehind) {
				SetGoal(owner->pos + (orderTarget->speed * 80), owner->pos, SQUARE_SIZE, orderTarget->speed.Length() * 1.1f);
			} else {
				StopMove();

				if (gs->frameNum > lastCloseInTry + MAX_CLOSE_IN_RETRY_TICKS) {
					owner->moveType->KeepPointingTo(orderTarget->midPos, minPointingDist, true);
				}
			}

			owner->AttackUnit(orderTarget, (c.options & INTERNAL_ORDER) == 0, c.GetID() == CMD_MANUALFIRE);
		}

		// if we're on hold pos in a temporary order, then none of the close-in
		// code below should run, and the attack command is cancelled.
		else if (tempOrder && owner->moveState == MOVESTATE_HOLDPOS) {
			StopMove();
			FinishCommand();
			return;
		}

		// if ((our movetype has type HoverAirMoveType and length of 2D vector from us to target
		// less than 90% of our maximum range) OR squared length of 2D vector from us to target
		// less than 1024) then we are close enough
		else if (targetMidPosDist2D < (owner->maxRange * 0.9f)) {
			if (dynamic_cast<CHoverAirMoveType*>(owner->moveType) != NULL || (targetMidPosVec.SqLength2D() < 1024)) {
				StopMove();
				owner->moveType->KeepPointingTo(orderTarget->midPos, minPointingDist, true);
			}

			// if (((first weapon range minus first weapon length greater than distance to target)
			// and length of 2D vector from us to target less than 90% of our maximum range)
			// then we are close enough, but need to move sideways to get a shot.
			//assumption is flawed: The unit may be aiming or otherwise unable to shoot
			else if (owner->unitDef->strafeToAttack && targetMidPosDist2D < (owner->maxRange * 0.9f)) {
				moveDir ^= (owner->moveType->progressState == AMoveType::Failed);

				const float sin = moveDir ? 3.0/5 : -3.0/5;
				const float cos = 4.0 / 5;

				float3 goalDiff;
				goalDiff.x = targetMidPosVec.dot(float3(cos, 0, -sin));
				goalDiff.z = targetMidPosVec.dot(float3(sin, 0,  cos));
				goalDiff *= (targetMidPosDist2D < (owner->maxRange * 0.3f)) ? 1/cos : cos;
				goalDiff += orderTarget->pos;
				SetGoal(goalDiff, owner->pos);
			}
		}

		// if 2D distance of (target position plus attacker error vector times 128)
		// to goal position greater than
		// (10 plus 20% of 2D distance between attacker and target) then we need to close
		// in on target more
		else if (targetGoalDist > targetPosDist) {
			// if the target isn't in LOS, go to its approximate position
			// otherwise try to go precisely to the target
			// this should fix issues with low range weapons (mainly melee)
			const float3 errPos = ((orderTarget->losStatus[owner->allyteam] & LOS_INLOS)? ZeroVector: owner->posErrorVector * 128.0f);
			const float3 tgtPos = orderTarget->pos + errPos;

			const float3 norm = (tgtPos - owner->pos).Normalize();
			const float3 goal = tgtPos - norm * (orderTarget->radius * edgeFactor * 0.8f);

			SetGoal(goal, owner->pos);

			if (lastCloseInTry < gs->frameNum + MAX_CLOSE_IN_RETRY_TICKS)
				lastCloseInTry = gs->frameNum;
		}
	}

	// user wants to attack the ground; cycle through our
	// weapons until we find one that can accomodate him
	else if (c.params.size() >= 3) {
		const float3 attackPos = c.GetPos(0);
		const float3 attackVec = attackPos - owner->pos;

		bool foundWeapon = false;

		for (unsigned int wNum = 0; wNum < owner->weapons.size(); wNum++) {
			CWeapon* w = owner->weapons[wNum];

			if (foundWeapon)
				break;

			// XXX HACK - special weapon overrides any checks
			if (c.GetID() == CMD_MANUALFIRE) {
				assert(owner->unitDef->canManualFire);

				if (!w->weaponDef->manualfire)
					continue;
				if (attackVec.SqLength() >= (w->range * w->range))
					continue;

				StopMove();
				owner->AttackGround(attackPos, (c.options & INTERNAL_ORDER) == 0, c.GetID() == CMD_MANUALFIRE);
				owner->moveType->KeepPointingTo(attackPos, owner->maxRange * 0.9f, true);

				foundWeapon = true;
			} else {
				// NOTE:
				//   we call TryTargetHeading which is less restrictive than TryTarget
				//   (eg. the former succeeds even if the unit has not already aligned
				//   itself with <attackVec>)
				if (w->TryTargetHeading(GetHeadingFromVector(attackVec.x, attackVec.z), attackPos, (c.options & INTERNAL_ORDER) == 0, NULL)) {
					if (w->TryTargetRotate(attackPos, (c.options & INTERNAL_ORDER) == 0)) {
						StopMove();
						owner->AttackGround(attackPos, (c.options & INTERNAL_ORDER) == 0, c.GetID() == CMD_MANUALFIRE);

						foundWeapon = true;
					}

					// for gunships, this pitches the nose down such that
					// TryTargetRotate (which also checks range for itself)
					// has a bigger chance of succeeding
					//
					// hence it must be called as soon as we get in range
					// and may not depend on what TryTargetRotate returns
					// (otherwise we might never get a firing solution)
					owner->moveType->KeepPointingTo(attackPos, owner->maxRange * 0.9f, true);
				}
			}
		}

		#if 0
		// no weapons --> no need to stop at an arbitrary distance?
		else if (diff.SqLength2D() < 1024) {
			StopMove();
			owner->moveType->KeepPointingTo(attackPos, owner->maxRange * 0.9f, true);
		}
		#endif

		// if we are unarmed and more than 10 elmos distant
		// from target position, then keeping moving closer
		if (owner->weapons.empty() && attackPos.SqDistance2D(goalPos) > 100) {
			SetGoal(attackPos, owner->pos);
		}
	}