made lower difficulty bots a bit easier

include/core.h

@@ -893,8 +893,10 @@ private:
    edict_t *m_targetEntity; // the entity that the bot is trying to reach
    edict_t *m_hostages[MAX_HOSTAGES]; // pointer to used hostage entities
 
+   bool m_moveToGoal; // bot currently moving to goal??
    bool m_isStuck; // bot is stuck
    bool m_isReloading; // bot is reloading a gun
+
    int m_reloadState; // current reload state
    int m_voicePitch; // bot voice pitch
 
@@ -946,13 +948,19 @@ private:
    float m_lookPitchVel; // look pitch velocity
    float m_lookUpdateTime; // lookangles update time
 
-   bool m_moveToGoal; // bot currently moving to goal??
+   Vector m_randomizedIdealAngles; // angle wanted with noise
+   Vector m_angularDeviation; // angular deviation from current to ideal angles
+   Vector m_aimSpeed; // aim speed calculated
+
+   float m_randomizeAnglesTime; // time last randomized location
+   float m_playerTargetTime; // time last targeting
 
    void InstantChatterMessage (int type);
    void BotAI (void);
    void CheckSpawnTimeConditions (void);
-   bool IsMorePowerfulWeaponCanBeBought (void);
    void PurchaseWeapons (void);
+
+   bool IsMorePowerfulWeaponCanBeBought (void);
    int PickBestFromRandom (int *random, int count);
 
    bool CanDuckUnder (const Vector &normal);
@@ -1009,6 +1017,7 @@ private:
    bool EnemyIsThreat (void);
    void UpdateLookAngles (void);
    void UpdateBodyAngles (void);
+   void UpdateLookAnglesLowSkill (const Vector &direction, const float delta);
    void SetIdealReactionTimes (bool actual = false);
    bool IsRestricted (int weaponIndex);
    bool IsRestrictedAMX (int weaponIndex);

source/basecode.cpp

@@ -5229,7 +5229,7 @@ void Bot::TakeDamage (edict_t *inflictor, int damage, int armor, int bits)
 
    if (IsValidPlayer (inflictor))
    {
-      if (m_seeEnemyTime + 4.0f < GetWorldTime () && yb_tkpunish.GetBool () && GetTeam (inflictor) == m_team && !bots.GetBot (inflictor))
+      if (yb_tkpunish.GetBool () && GetTeam (inflictor) == m_team && !IsValidBot (inflictor))
       {
          // alright, die you teamkiller!!!
          m_actualReactionTime = 0.0f;

source/combat.cpp

@@ -126,7 +126,7 @@ bool Bot::CheckVisibility (edict_t *target, Vector *origin, byte *bodyPart)
       *bodyPart |= VISIBLE_HEAD;
       *origin = target->v.origin + target->v.view_ofs;
 
-      if (m_difficulty == 4)
+      if (m_difficulty > 3)
          origin->z += 1.0f;
    }
 
@@ -509,7 +509,7 @@ const Vector &Bot::GetAimPosition (void)
    else
       m_enemyOrigin = targetOrigin;
 
-   if (distance >= 256.0f)
+   if (distance >= 256.0f && m_difficulty < 4)
       m_enemyOrigin += velocity;
 
    return m_enemyOrigin;
@@ -517,7 +517,8 @@ const Vector &Bot::GetAimPosition (void)
 
 float Bot::GetZOffset (float distance)
 {
-   // got it from pbmm
+   if (m_difficulty < 3)
+      return 0.0f;
 
    bool sniper = UsesSniper ();
    bool pistol = UsesPistol ();
@@ -977,6 +978,9 @@ bool Bot::IsWeaponBadInDistance (int weaponIndex, float distance)
    // this function checks, is it better to use pistol instead of current primary weapon
    // to attack our enemy, since current weapon is not very good in this situation.
 
+   if (m_difficulty < 2)
+      return false;
+
    int weaponID = g_weaponSelect[weaponIndex].id;
 
    if (weaponID == WEAPON_KNIFE)

source/manager.cpp

@@ -1081,6 +1081,7 @@ void Bot::NewRound (void)
 
    m_reloadCheckTime = 0.0;
    m_shootTime = GetWorldTime ();
+   m_playerTargetTime = GetWorldTime ();
    m_firePause = 0.0;
    m_timeLastFired = 0.0;
 
@@ -1159,10 +1160,6 @@ void Bot::NewRound (void)
       ChatterMessage (Chatter_NewRound);
 
    m_thinkInterval = (1.0f / 30.0f) * Random.Float (0.95f, 1.05f);
-
-   // fixes bot looking at weird positions during buytime with think fps
-   m_aimFlags |= AIM_NAVPOINT;
-   ChooseAimDirection ();
 }
 
 void Bot::Kill (void)

source/navigate.cpp

@@ -109,8 +109,8 @@ int Bot::FindGoal (void)
          }
          return m_chosenGoalIndex = ChooseBombWaypoint ();
       }
-      defensive += 25.0f;
-      offensive -= 25.0f;
+      defensive += 25.0f + m_difficulty * 2.0f;
+      offensive -= 25.0f - m_difficulty * 0.5f;
 
       if (m_personality != PERSONALITY_RUSHER)
          defensive += 10.0f;
@@ -649,15 +649,6 @@ bool Bot::DoWaypointNav (void)
 
    TraceResult tr, tr2;
 
-   // check if we fallen from something
-   if (IsOnFloor () && m_jumpFinished && m_currentWaypointIndex > 0)
-   {
-      const Vector &wptOrg = m_currentPath->origin;
-
-      if ((pev->origin - wptOrg).GetLength2D () <= 100.0f && (wptOrg.z > pev->origin.z + 20.0f))
-         m_currentWaypointIndex = -1;
-   }
-
    // check if we need to find a waypoint...
    if (m_currentWaypointIndex == -1)
    {
@@ -3173,8 +3164,17 @@ void Bot::UpdateLookAngles (void)
 
    direction.ClampAngles ();
 
+   // lower skilled bot's have lower aiming
+   if (m_difficulty < 3)
+   {
+      UpdateLookAnglesLowSkill (direction, delta);
+      UpdateBodyAngles ();
+
+      return;
+   }
+
    // this is what makes bot almost godlike (got it from sypb)
-   if (m_difficulty == 4 && (m_aimFlags & AIM_ENEMY) && (m_wantsToFire || UsesSniper ()) && yb_whose_your_daddy.GetBool ())
+   if (m_difficulty > 3 && (m_aimFlags & AIM_ENEMY) && (m_wantsToFire || UsesSniper ()) && yb_whose_your_daddy.GetBool ())
    {
       pev->v_angle = direction;
       UpdateBodyAngles ();
@@ -3230,6 +3230,94 @@ void Bot::UpdateLookAngles (void)
    UpdateBodyAngles ();
 }
 
+void Bot::UpdateLookAnglesLowSkill (const Vector &direction, const float delta)
+{
+   Vector spring (13.0f, 13.0f, 0.0f);
+   Vector damperCoefficient (0.22f, 0.22f, 0.0f);
+
+   Vector influence = Vector (0.25f, 0.17f, 0.0f) * ((100 - (m_difficulty * 25)) / 100.f);
+   Vector randomization = Vector (2.0f, 0.18f, 0.0f)  * ((100 - (m_difficulty * 25)) / 100.f);
+
+   const float noTargetRatio = 0.3f;
+   const float offsetDelay = 1.2f;
+
+   Vector stiffness = nullvec;
+   Vector randomize = nullvec;
+
+   m_idealAngles = direction.Get2D ();
+   m_idealAngles.ClampAngles ();
+
+   if (m_aimFlags & (AIM_ENEMY | AIM_ENTITY | AIM_GRENADE | AIM_LAST_ENEMY) || GetTaskId () == TASK_SHOOTBREAKABLE)
+   {
+      m_playerTargetTime = GetWorldTime ();
+      m_randomizedIdealAngles = m_idealAngles;
+
+      stiffness = spring * (0.2 + (m_difficulty * 25) / 125.0);
+   }
+   else
+   {
+      // is it time for bot to randomize the aim direction again (more often where moving) ?
+      if (m_randomizeAnglesTime < GetWorldTime () && ((pev->velocity.GetLength () > 1.0 && m_angularDeviation.GetLength () < 5.0) || m_angularDeviation.GetLength () < 1.0))
+      {
+         // is the bot standing still ?
+         if (pev->velocity.GetLength () < 1.0)
+            randomize = randomization * 0.2; // randomize less
+         else
+            randomize = randomization;
+
+         // randomize targeted location a bit (slightly towards the ground)
+         m_randomizedIdealAngles = m_idealAngles + Vector (Random.Float (-randomize.x * 0.5, randomize.x * 1.5), Random.Float (-randomize.y, randomize.y), 0);
+
+         // set next time to do this
+         m_randomizeAnglesTime = GetWorldTime () + Random.Float (0.4f, offsetDelay);
+      }
+      float stiffnessMultiplier = noTargetRatio;
+
+      // take in account whether the bot was targeting someone in the last N seconds
+      if (GetWorldTime () - (m_playerTargetTime + offsetDelay) < noTargetRatio * 10.0)
+      {
+         stiffnessMultiplier = 1.0 - (GetWorldTime () - m_timeLastFired) * 0.1;
+
+         // don't allow that stiffness multiplier less than zero
+         if (stiffnessMultiplier < 0.0)
+            stiffnessMultiplier = 0.5;
+      }
+
+      // also take in account the remaining deviation (slow down the aiming in the last 10°)
+      if (m_difficulty < 3 && (m_angularDeviation.GetLength () < 10.0))
+         stiffnessMultiplier *= m_angularDeviation.GetLength () * 0.1;
+
+      // slow down even more if we are not moving
+      if (m_difficulty < 3 && pev->velocity.GetLength () < 1.0 && GetTaskId () != TASK_CAMP && GetTaskId () != TASK_ATTACK)
+         stiffnessMultiplier *= 0.5;
+
+      // but don't allow getting below a certain value
+      if (stiffnessMultiplier < 0.35)
+         stiffnessMultiplier = 0.35;
+
+      stiffness = spring * stiffnessMultiplier; // increasingly slow aim
+   }
+   // compute randomized angle deviation this time
+   m_angularDeviation = m_randomizedIdealAngles - pev->v_angle;
+   m_angularDeviation.ClampAngles ();
+
+   // spring/damper model aiming
+   m_aimSpeed.x = (stiffness.x * m_angularDeviation.x) - (damperCoefficient.x * m_aimSpeed.x);
+   m_aimSpeed.y = (stiffness.y * m_angularDeviation.y) - (damperCoefficient.y * m_aimSpeed.y);
+
+   // influence of y movement on x axis and vice versa (less influence than x on y since it's
+   // easier and more natural for the bot to "move its mouse" horizontally than vertically)
+   m_aimSpeed.x += m_aimSpeed.y * influence.y;
+   m_aimSpeed.y += m_aimSpeed.x * influence.x;
+
+   // move the aim cursor
+   if (m_difficulty == 4 && (m_aimFlags & AIM_ENEMY) && (m_wantsToFire || UsesSniper ()))
+      pev->v_angle = direction;
+   else
+      pev->v_angle = pev->v_angle + delta * Vector (m_aimSpeed.x, m_aimSpeed.y, 0.0f);
+
+   pev->v_angle.ClampAngles ();
+}
 
 void Bot::SetStrafeSpeed (const Vector &moveDir, float strafeSpeed)
 {
@@ -3290,7 +3378,7 @@ bool Bot::IsPointOccupied (int index)
          // length check
          float length = (waypoints.GetPath (occupyId)->origin - waypoints.GetPath (index)->origin).GetLengthSquared ();
 
-         if (occupyId == index || bot->GetTask ()->data == index || length < GET_SQUARE (64.0f))
+         if (occupyId == index || bot->GetTask ()->data == index || length < GET_SQUARE (75.0f))
             return true;
       }
    }