(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2008 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 *)

////////////////////////////////////////////////////////////////////////////////

procedure ChangeAmmo(Gear: PGear);

var slot, i: Longword;

begin

slot:= Gear^.MsgParam;

with PHedgehog(Gear^.Hedgehog)^ do

	begin

	if ((Gear^.State and (gstAttacking or gstAttacked)) <> 0)

		or (AttacksNum > 0)

		or ((Gear^.State and gstHHDriven) = 0) then exit;

	Gear^.Message:= Gear^.Message and not (gm_LJump or gm_HJump or gm_Slot);

	if CurSlot = slot then

		begin

		i:= 0;

		repeat

		inc(CurAmmo);

		if (CurAmmo > cMaxSlotAmmoIndex) then

			begin

			CurAmmo:= 0;

			inc(i);

			TryDo(i < 2, 'Engine bug: no ammo in current slot', true)

			end;

		until (Ammo^[slot, CurAmmo].Count > 0) and (Team^.Clan^.TurnNumber > Ammoz[Ammo^[slot, CurAmmo].AmmoType].SkipTurns)

		end else

		begin

		i:= 0;

		// check whether there's ammo in slot

		while (i <= cMaxSlotAmmoIndex)

		  and ((Ammo^[slot, i].Count = 0)

		       or (Team^.Clan^.TurnNumber <= Ammoz[Ammo^[slot, i].AmmoType].SkipTurns)) do inc(i);

		if i <= cMaxSlotAmmoIndex then

			begin

			CurSlot:= slot;

			CurAmmo:= i

			end

		end

	end;

ApplyAmmoChanges(PHedgehog(Gear^.Hedgehog)^)

end;

procedure HHSetWeapon(Gear: PGear);

var t: LongInt;

    weap: TAmmoType;

begin

weap:= TAmmoType(Gear^.MsgParam);

if PHedgehog(Gear^.Hedgehog)^.Team^.Clan^.TurnNumber <= Ammoz[weap].SkipTurns then exit; // weapon isn't activated yet

Gear^.MsgParam:= Ammoz[weap].Slot;

t:= cMaxSlotAmmoIndex;

Gear^.Message:= Gear^.Message and not gm_Weapon;

with PHedgehog(Gear^.Hedgehog)^ do

	while (Ammo^[CurSlot, CurAmmo].AmmoType <> weap) and (t >= 0) do

		begin

		ChangeAmmo(Gear);

		dec(t)

		end

end;

procedure HHSetTimer(Gear: PGear);

begin

Gear^.Message:= Gear^.Message and not gm_Timer;

with PHedgehog(Gear^.Hedgehog)^ do

	if (Ammo^[CurSlot, CurAmmo].Propz and ammoprop_Timerable) <> 0 then

		begin

		Ammo^[CurSlot, CurAmmo].Timer:= 1000 * Gear^.MsgParam;

		with CurrentTeam^ do

			ApplyAmmoChanges(Hedgehogs[CurrHedgehog]);

		end;

end;

procedure Attack(Gear: PGear);

var xx, yy: hwFloat;

begin

with Gear^,

     PHedgehog(Gear^.Hedgehog)^ do

     begin

     if ((State and gstHHDriven) <> 0)and

        ((State and (gstAttacked or gstHHChooseTarget)) = 0)and

        (((State and gstMoving) = 0) or ((Ammo^[CurSlot, CurAmmo].Propz and ammoprop_AttackInMove) <> 0))and

        ((TargetPoint.X <> NoPointX) or ((Ammo^[CurSlot, CurAmmo].Propz and ammoprop_NeedTarget) = 0)) then

        begin

        State:= State or gstAttacking;

        if Power = cMaxPower then Message:= Message and not gm_Attack

        else if (Ammo^[CurSlot, CurAmmo].Propz and ammoprop_Power) = 0 then Message:= Message and not gm_Attack

        else begin

             if Power = 0 then

                begin

                AttackBar:= CurrentTeam^.AttackBar;

                PlaySound(sndThrowPowerUp, false)

                end;

             inc(Power)

             end;

        if ((Message and gm_Attack) <> 0) then exit;

        if (Ammo^[CurSlot, CurAmmo].Propz and ammoprop_Power) <> 0 then

           begin

           StopSound(sndThrowPowerUp);

           PlaySound(sndThrowRelease, false);

           end;

        xx:= SignAs(AngleSin(Angle), dX);

        yy:= -AngleCos(Angle);

        if ((Gear^.State and gstHHHJump) <> 0) then xx:= - xx;

             case Ammo^[CurSlot, CurAmmo].AmmoType of

                      amGrenade: FollowGear:= AddGear(hwRound(X), hwRound(Y), gtAmmo_Bomb,    0, xx*Power/cPowerDivisor, yy*Power/cPowerDivisor, Ammo^[CurSlot, CurAmmo].Timer);

                  amClusterBomb: FollowGear:= AddGear(hwRound(X), hwRound(Y), gtClusterBomb,  0, xx*Power/cPowerDivisor, yy*Power/cPowerDivisor, Ammo^[CurSlot, CurAmmo].Timer);

                      amBazooka: FollowGear:= AddGear(hwRound(X), hwRound(Y), gtAmmo_Grenade, 0, xx*Power/cPowerDivisor, yy*Power/cPowerDivisor, 0);

                          amUFO: FollowGear:= AddGear(hwRound(X), hwRound(Y), gtUFO,          0, xx*Power/cPowerDivisor, yy*Power/cPowerDivisor, 0);

                      amShotgun: begin

                                 PlaySound(sndShotgunReload, false);

                                 CurAmmoGear:= AddGear(hwRound(X), hwRound(Y), gtShotgunShot,  0, xx * _0_5, yy * _0_5, 0);

                                 end;

                   amPickHammer: CurAmmoGear:= AddGear(hwRound(Gear^.X), hwRound(Gear^.Y) + cHHRadius, gtPickHammer, 0, _0, _0, 0);

                         amSkip: ParseCommand('/skip', true);

                         amRope: CurAmmoGear:= AddGear(hwRound(Gear^.X), hwRound(Gear^.Y), gtRope, 0, xx, yy, 0);

                         amMine: begin

                                 AddGear(hwRound(X) + hwSign(dX) * 7, hwRound(Y), gtMine, 0, SignAs(_0_02, dX), _0, 3000);

                                 PlaySound(sndLaugh, false)

                                 end;

                       amDEagle: CurAmmoGear:= AddGear(hwRound(X + xx * cHHRadius), hwRound(Y + yy * cHHRadius), gtDEagleShot, 0, xx * _0_5, yy * _0_5, 0);

                     amDynamite: begin

                                 AddGear(hwRound(X) + hwSign(dX) * 7, hwRound(Y), gtDynamite, 0, SignAs(_0_03, dX), _0, 5000);

                                 PlaySound(sndLaugh, false)

                                 end;

                    amFirePunch: CurAmmoGear:= AddGear(hwRound(X) + hwSign(dX) * 10, hwRound(Y), gtFirePunch, 0, xx, _0, 0);

                         amWhip: CurAmmoGear:= AddGear(hwRound(X) + hwSign(dX) * 10, hwRound(Y), gtWhip, 0, SignAs(_1, dX), - _0_8, 0);

                  amBaseballBat: CurAmmoGear:= AddGear(hwRound(X) + hwSign(dX) * 10, hwRound(Y), gtShover, 0, xx * _0_5, yy * _0_5, 0);

                    amParachute: CurAmmoGear:= AddGear(hwRound(X), hwRound(Y), gtParachute, 0, _0, _0, 0);

                    amAirAttack: AddGear(Ammo^[CurSlot, CurAmmo].Pos, 0, gtAirAttack, 0, _0, _0, 0);

                   amMineStrike: AddGear(Ammo^[CurSlot, CurAmmo].Pos, 0, gtAirAttack, 1, _0, _0, 0);

                    amBlowTorch: CurAmmoGear:= AddGear(hwRound(X), hwRound(Y), gtBlowTorch, 0, SignAs(_0_5, dX), _0, 0);

                       amGirder: CurAmmoGear:= AddGear(0, 0, gtGirder, Ammo^[CurSlot, CurAmmo].Pos, _0, _0, 0);

                     amTeleport: CurAmmoGear:= AddGear(0, 0, gtTeleport, 0, _0, _0, 0);

                       amSwitch: CurAmmoGear:= AddGear(hwRound(X), hwRound(Y), gtSwitcher, 0, _0, _0, 0);

                       amMortar: FollowGear:= AddGear(hwRound(X), hwRound(Y), gtMortar,  0, xx*cMaxPower/cPowerDivisor, yy*cMaxPower/cPowerDivisor, 0);

                       amKamikaze: CurAmmoGear:= AddGear(hwRound(X), hwRound(Y), gtKamikaze, 0, xx * _0_5, yy * _0_5, 0);

                         amCake: begin

                                 CurAmmoGear:= AddGear(hwRound(X) + hwSign(dX) * 3, hwRound(Y), gtCake, 0, xx, _0, 0);

                                 PlaySound(sndLaugh, false)

                                 end;

                    amSeduction: CurAmmoGear:= AddGear(hwRound(X + xx * cHHRadius * 2), hwRound(Y + yy * cHHRadius * 2), gtSeduction, 0, xx * _0_4, yy * _0_4, 0);

                   amWatermelon: FollowGear:= AddGear(hwRound(X), hwRound(Y), gtWatermelon,  0, xx*Power/cPowerDivisor, yy*Power/cPowerDivisor, Ammo^[CurSlot, CurAmmo].Timer);

                  amHellishBomb: FollowGear:= AddGear(hwRound(X), hwRound(Y), gtHellishBomb,    0, xx*Power/cPowerDivisor, yy*Power/cPowerDivisor, 5000);

                       amNapalm: AddGear(Ammo^[CurSlot, CurAmmo].Pos, 0, gtAirAttack, 2, _0, _0, 0);

                  end;

        uStats.AmmoUsed(Ammo^[CurSlot, CurAmmo].AmmoType);

        Power:= 0;

        if (CurAmmoGear <> nil)

           and (((Ammo^[CurSlot, CurAmmo].Propz) and ammoprop_AltUse) = 0){check for dropping ammo from rope} then

           begin

           CurAmmoGear^.Ammo:= @(Ammo^[CurSlot, CurAmmo]);

           Message:= Message or gm_Attack;

           CurAmmoGear^.Message:= Message

           end else begin

           if not CurrentTeam^.ExtDriven and

             ((Ammo^[CurSlot, CurAmmo].Propz and ammoprop_Power) <> 0) then SendIPC('a');

           AfterAttack

           end

        end else Message:= Message and not gm_Attack

     end

end;

procedure AfterAttack;

begin

with CurrentHedgehog^.Gear^,

		CurrentHedgehog^ do

	begin

		Inc(AttacksNum);

		State:= State and not gstAttacking;

		if (Ammo^[CurSlot, CurAmmo].NumPerTurn >= AttacksNum) or

		((GameFlags and gfMultiWeapon) <> 0) then isInMultiShoot:= true

		else begin

		TurnTimeLeft:= Ammoz[Ammo^[CurSlot, CurAmmo].AmmoType].TimeAfterTurn;

		State:= State or gstAttacked;

		OnUsedAmmo(CurrentHedgehog^)

		end;

	AttackBar:= 0;

	end

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepHedgehogDead(Gear: PGear);

const frametime = 200;

      timertime = frametime * 6;

begin

if Gear^.Timer > 1 then

	begin

	AllInactive:= false;

	dec(Gear^.Timer);

	if (Gear^.Timer mod frametime) = 0 then inc(Gear^.Pos)

	end else

if Gear^.Timer = 1 then

	begin

	Gear^.State:= Gear^.State or gstNoDamage;

	doMakeExplosion(hwRound(Gear^.X), hwRound(Gear^.Y), 30, EXPLAutoSound);

	AddGear(hwRound(Gear^.X), hwRound(Gear^.Y), gtGrave, 0, _0, _0, 0)^.Hedgehog:= Gear^.Hedgehog;

	DeleteGear(Gear);

	SetAllToActive

	end else // Gear^.Timer = 0

	begin

	AllInactive:= false;

	Gear^.Z:= cCurrHHZ;

	RemoveGearFromList(Gear);

	InsertGearToList(Gear);

	PlaySound(sndByeBye, false);

	Gear^.Pos:= 0;

	Gear^.Timer:= timertime

	end

end;

////////////////////////////////////////////////////////////////////////////////

procedure PickUp(HH, Gear: PGear);

var s: shortstring;

    a: TAmmoType;

begin

Gear^.Message:= gm_Destroy;

case Gear^.Pos of

       posCaseAmmo: begin

                    a:= TAmmoType(Gear^.State);

                    AddAmmo(PHedgehog(HH^.Hedgehog)^, a);

                    if (not (PHedgehog(HH^.Hedgehog)^.Team^.ExtDriven

                      or (PHedgehog(HH^.Hedgehog)^.BotLevel > 0)))

                    or (GameType = gmtDemo)  then

                       begin

                       s:= trammo[Ammoz[a].NameId] + '(+' + IntToStr(Ammoz[a].NumberInCase) + ')';

                       AddCaption(s, PHedgehog(HH^.Hedgehog)^.Team^.Clan^.Color, capgrpAmmoinfo);

                       end

                    end;

     posCaseHealth: begin

                    inc(HH^.Health, Gear^.Health);

                    str(Gear^.Health, s);

                    s:= '+' + s;

                    AddCaption(s, PHedgehog(HH^.Hedgehog)^.Team^.Clan^.Color, capgrpAmmoinfo);

                    RenderHealth(PHedgehog(HH^.Hedgehog)^);

                    RecountTeamHealth(PHedgehog(HH^.Hedgehog)^.Team)

                    end;

     end

end;

const StepTicks: LongWord = 0;

procedure HedgehogStep(Gear: PGear);

var PrevdX: LongInt;

begin

if ((Gear^.State and (gstAttacking or gstMoving)) = 0) then

   begin

   if isCursorVisible then

      with PHedgehog(Gear^.Hedgehog)^ do

        with Ammo^[CurSlot, CurAmmo] do

          begin

          if (Gear^.Message and gm_Left  ) <> 0 then

             Pos:= (Pos + Ammoz[AmmoType].PosCount - 1) mod Ammoz[AmmoType].PosCount

          else

          if (Gear^.Message and gm_Right ) <> 0 then

             Pos:= (Pos + 1) mod Ammoz[AmmoType].PosCount

          else exit;

          StepTicks:= 200;

          exit

          end;

	if ((Gear^.Message and gm_Animate) <> 0) then

		begin

		Gear^.Message:= 0;

		Gear^.State:= Gear^.State or gstAnimation;

		Gear^.Tag:= Gear^.MsgParam;

		Gear^.Timer:= 0;

		Gear^.Pos:= 0

		end;

   if ((Gear^.Message and gm_LJump ) <> 0) then

      begin

      Gear^.Message:= Gear^.Message and not gm_LJump;

      DeleteCI(Gear);

      if not TestCollisionYwithGear(Gear, -1) then

         if not TestCollisionXwithXYShift(Gear, _0, -2, hwSign(Gear^.dX)) then Gear^.Y:= Gear^.Y - _2 else

         if not TestCollisionXwithXYShift(Gear, _0, -1, hwSign(Gear^.dX)) then Gear^.Y:= Gear^.Y - _1;

      if not (TestCollisionXwithGear(Gear, hwSign(Gear^.dX))

         or   TestCollisionYwithGear(Gear, -1)) then

         begin

         Gear^.dY:= -_0_15;

         Gear^.dX:= SignAs(_0_15, Gear^.dX);

         Gear^.State:= Gear^.State or gstMoving or gstHHJumping;

         PlaySound(sndJump1, false);

         exit

         end;

      end;

   if ((Gear^.Message and gm_HJump ) <> 0) then

      begin

      DeleteCI(Gear);

      Gear^.Message:= Gear^.Message and not gm_HJump;

      Gear^.dY:= -_0_2;

      SetLittle(Gear^.dX);

      Gear^.State:= Gear^.State or gstMoving or gstHHJumping;

      PlaySound(sndJump3, false);

      exit

      end;

   PrevdX:= hwSign(Gear^.dX);

   if (Gear^.Message and gm_Left  )<>0 then Gear^.dX:= -cLittle else

   if (Gear^.Message and gm_Right )<>0 then Gear^.dX:=  cLittle else exit;

   StepTicks:= cHHStepTicks;

   if PrevdX <> hwSign(Gear^.dX) then

      begin

      FollowGear:= Gear;

      exit

      end;

   DeleteCI(Gear); // must be after exit!! (see previous line)

   PHedgehog(Gear^.Hedgehog)^.visStepPos:= (PHedgehog(Gear^.Hedgehog)^.visStepPos + 1) and 7;

   if TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then

      begin

      if not (TestCollisionXwithXYShift(Gear, _0, -6, hwSign(Gear^.dX))

         or TestCollisionYwithGear(Gear, -1)) then Gear^.Y:= Gear^.Y - _1;

      if not (TestCollisionXwithXYShift(Gear, _0, -5, hwSign(Gear^.dX))

         or TestCollisionYwithGear(Gear, -1)) then Gear^.Y:= Gear^.Y - _1;

      if not (TestCollisionXwithXYShift(Gear, _0, -4, hwSign(Gear^.dX))

         or TestCollisionYwithGear(Gear, -1)) then Gear^.Y:= Gear^.Y - _1;

      if not (TestCollisionXwithXYShift(Gear, _0, -3, hwSign(Gear^.dX))

         or TestCollisionYwithGear(Gear, -1)) then Gear^.Y:= Gear^.Y - _1;

      if not (TestCollisionXwithXYShift(Gear, _0, -2, hwSign(Gear^.dX))

         or TestCollisionYwithGear(Gear, -1)) then Gear^.Y:= Gear^.Y - _1;

      if not (TestCollisionXwithXYShift(Gear, _0, -1, hwSign(Gear^.dX))

         or TestCollisionYwithGear(Gear, -1)) then Gear^.Y:= Gear^.Y - _1;

      end;

   if not TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then Gear^.X:= Gear^.X + SignAs(_1, Gear^.dX);

   SetAllHHToActive;

   if not TestCollisionYwithGear(Gear, 1) then

   begin

   Gear^.Y:= Gear^.Y + _1;

   if not TestCollisionYwithGear(Gear, 1) then

   begin

   Gear^.Y:= Gear^.Y + _1;

   if not TestCollisionYwithGear(Gear, 1) then

   begin

   Gear^.Y:= Gear^.Y + _1;

   if not TestCollisionYwithGear(Gear, 1) then

   begin

   Gear^.Y:= Gear^.Y + _1;

   if not TestCollisionYwithGear(Gear, 1) then

   begin

   Gear^.Y:= Gear^.Y + _1;

   if not TestCollisionYwithGear(Gear, 1) then

   begin

   Gear^.Y:= Gear^.Y + _1;

   if not TestCollisionYwithGear(Gear, 1) then

      begin

      Gear^.Y:= Gear^.Y - _6;

      Gear^.dY:= _0;

      Gear^.State:= Gear^.State or gstMoving;

      exit

      end;

   end

   end

   end

   end

   end

   end;

   AddGearCI(Gear)

   end

end;

procedure HedgehogChAngle(Gear: PGear);

var da: LongWord;

begin

with PHedgehog(Gear^.Hedgehog)^ do

	if (Ammo^[CurSlot, CurAmmo].AmmoType = amRope)

	and ((Gear^.State and (gstMoving or gstHHJumping)) = gstMoving) then da:= 2 else da:= 1;

if ((Gear^.Message and gm_Up) <> 0) and (Gear^.Angle - da >= CurMinAngle) then dec(Gear^.Angle, da)

else

if ((Gear^.Message and gm_Down) <> 0) and (Gear^.Angle + da <= CurMaxAngle) then inc(Gear^.Angle, da);

end;

procedure doStepHedgehog(Gear: PGear); forward;

////////////////////////////////////////////////////////////////////////////////

procedure doStepHedgehogMoving(Gear: PGear);

var isFalling: boolean;

begin

isFalling:= (Gear^.dY.isNegative) or not TestCollisionYKick(Gear, 1);

if isFalling then

   begin

   if (Gear^.dY.isNegative) and TestCollisionYKick(Gear, -1) then Gear^.dY:= _0;

   Gear^.State:= Gear^.State or gstMoving;

   Gear^.dY:= Gear^.dY + cGravity

   end else

   begin

   if ((hwAbs(Gear^.dX) + hwAbs(Gear^.dY)) < _0_55)

      and ((Gear^.State and gstHHJumping) <> 0) then SetLittle(Gear^.dX);

   if not Gear^.dY.isNegative then

      begin

      CheckHHDamage(Gear);

      if ((Gear^.State and gstHHHJump) <> 0) and

         (Gear^.dX.QWordValue < _0_02.QWordValue) then Gear^.dX.isNegative:= not Gear^.dX.isNegative; // landing after high jump

      Gear^.State:= Gear^.State and not (gstHHJumping or gstHHHJump);

      Gear^.dY:= _0;

      end else Gear^.dY:= Gear^.dY + cGravity;

   if ((Gear^.State and gstMoving) <> 0) then Gear^.dX:= Gear^.dX * Gear^.Friction

   end;

if (Gear^.State <> 0) then DeleteCI(Gear);

if (Gear^.State and gstMoving) <> 0 then

   if TestCollisionXKick(Gear, hwSign(Gear^.dX)) then

      if not isFalling then

         if hwAbs(Gear^.dX) > _0_01 then

            if not TestCollisionXwithXYShift(Gear, int2hwFloat(hwSign(Gear^.dX)) - Gear^.dX, -1, hwSign(Gear^.dX)) then begin Gear^.X:= Gear^.X + Gear^.dX; Gear^.dX:= Gear^.dX * _0_96; Gear^.Y:= Gear^.Y - _1 end else

            if not TestCollisionXwithXYShift(Gear, int2hwFloat(hwSign(Gear^.dX)) - Gear^.dX, -2, hwSign(Gear^.dX)) then begin Gear^.X:= Gear^.X + Gear^.dX; Gear^.dX:= Gear^.dX * _0_93; Gear^.Y:= Gear^.Y - _2 end else

            if not TestCollisionXwithXYShift(Gear, int2hwFloat(hwSign(Gear^.dX)) - Gear^.dX, -3, hwSign(Gear^.dX)) then begin Gear^.X:= Gear^.X + Gear^.dX; Gear^.dX:= Gear^.dX * _0_9 ; Gear^.Y:= Gear^.Y - _3 end else

            if not TestCollisionXwithXYShift(Gear, int2hwFloat(hwSign(Gear^.dX)) - Gear^.dX, -4, hwSign(Gear^.dX)) then begin Gear^.X:= Gear^.X + Gear^.dX; Gear^.dX:= Gear^.dX * _0_87; Gear^.Y:= Gear^.Y - _4 end else

            if not TestCollisionXwithXYShift(Gear, int2hwFloat(hwSign(Gear^.dX)) - Gear^.dX, -5, hwSign(Gear^.dX)) then begin Gear^.X:= Gear^.X + Gear^.dX; Gear^.dX:= Gear^.dX * _0_84; Gear^.Y:= Gear^.Y - _5 end else

            if hwAbs(Gear^.dX) > _0_02 then Gear^.dX:= -Gear^.Elasticity * Gear^.dX

                                   else begin

                                        Gear^.State:= Gear^.State and not gstMoving;

                                        SetLittle(Gear^.dX)

                                        end

            else begin

                 Gear^.State:= Gear^.State and not gstMoving;

                 SetLittle(Gear^.dX)

                 end

if (not isFalling) and

   (hwAbs(Gear^.dX) + hwAbs(Gear^.dY) < _0_03) then

   begin

   Gear^.State:= Gear^.State and not gstMoving;

   SetLittle(Gear^.dX);

   Gear^.dY:= _0

   end else Gear^.State:= Gear^.State or gstMoving;

if (Gear^.State and gstMoving) <> 0 then

   begin

   Gear^.State:= Gear^.State and not gstAnimation;

   Gear^.X:= Gear^.X + Gear^.dX;

   Gear^.Y:= Gear^.Y + Gear^.dY;

   if (not Gear^.dY.isNegative) and

      (not TestCollisionYKick(Gear, 1)) and

       TestCollisionYwithXYShift(Gear, 0, 1, 1) then

      begin

      CheckHHDamage(Gear);