void SafeMovePolar(unit u, real dist, real angle)
     {  
         real x = GetWidgetX(u) + dist * Cos(angle * 0.017)
         real y = GetWidgetY(u) + dist * Sin(angle * 0.017)
         if x > minX && x < maxX { SetUnitX(u, x) }  
         if y > minY && y < maxY { SetUnitY(u, y) }  
     }  

     private void MoveShall()
     {
         timer t = GetExpiredTimer(); timer tim = t
         unit d = LoadUnitHandle(Hash, GetHandleId(t), 0)
         real x = GetWidgetX(d); real y = GetWidgetY(d)
         unit u = LoadUnitHandle(Hash, GetHandleId(t), 1)
         player p = GetOwningPlayer(u)
         unit c = GCESU(p, x, y, POISON_DART_AOE)
         real a = LoadReal(Hash, GetHandleId(t), 2)
         real dist = LoadReal(Hash, GetHandleId(t), 3)
         int lvl = LoadInteger(Hash, GetHandleId(t), 4)
         real step = LoadReal(Hash, GetHandleId(t), 5)
         int level = LoadInteger(Hash, GetHandleId(t), 6)
         int ch = GetRandomInt(1, 100)
         real dmg = POISON_DART_DMG1(lvl)
          
         if ch <= LETHAL_DOSE_CH { dmg = LETHAL_DOSE_DMG(POISON_DART_DMG1(lvl), level) }
          
         if c != null
         {
             KillUnit(d)
             DamageUnit(u, c, dmg, "poison", true)
             d = CreateUnit(GetOwningPlayer(u), DUMMY, x, y, 0)
             UnitAddAbility(d, POISON_DART_AB_SL)
             SetUnitAbilityLevel(d, POISON_DART_AB_SL, lvl)
             IssueTargetOrder(d, "bloodlust", c)
             UnitApplyTimedLife(d, 'BTLF', 0.5)
             PauseTimer(t); DestroyTimer(t)
             FlushChildHashtable(Hash, GetHandleId(t))
              
             tim = new timer
             SaveUnitHandle(Hash, GetHandleId(tim), 0, u)
             SaveUnitHandle(Hash, GetHandleId(tim), 1, c)
             SaveReal(Hash, GetHandleId(tim), 2, POISON_DART_DMG2(lvl))
             SaveInteger(Hash, GetHandleId(tim), 3, level)
             TimerStart(tim, POISON_DART_TIME, false, function FinishDamage)
         }
         if dist > 0.0
         {
             SafeMovePolar(d, step, a)
             SaveReal(Hash, GetHandleId(t), 3, dist - step)
         }
         else
         {
             KillUnit(d); PauseTimer(t); DestroyTimer(t)
             FlushChildHashtable(Hash, GetHandleId(t))
         }
          
         t = null; tim = null; d = null; u = null; c = null
     }

     callback onUnitSpellEffect(POISON_DART_AB)
     {
         unit u = GetTriggerUnit(); timer t = new timer
         int lvl = GetUnitAbilityLevel(u, POISON_DART_AB)
         int level = GetUnitAbilityLevel(u, LETHAL_DOSE_AB)
         real x1 = GetWidgetX(u); real y1 = GetWidgetY(u)
         real x2 = GetSpellTargetX(); real y2 = GetSpellTargetY()
         real a = 57.296 * Atan2(y2 - y1, x2 - x1)
         real x3 = x1 + Cos(a * 0.017) * POISON_DART_AOE
         real y3 = y1 + Sin(a * 0.017) * POISON_DART_AOE
         unit d = CreateUnit(GetOwningPlayer(u), POISON_DART_SH, x3, y3, a)
          
         SetUnitScale(d, 1.0, 2.5, 2.5)
         SetUnitPathing(d, false)
         SetUnitX(d, x3); SetUnitY(d, y3)
         SaveUnitHandle(Hash, GetHandleId(t), 0, d)
         SaveUnitHandle(Hash, GetHandleId(t), 1, u)
         SaveReal(Hash, GetHandleId(t), 2, a)
         SaveReal(Hash, GetHandleId(t), 3, POISON_DART_DIST - POISON_DART_AOE)
         SaveInteger(Hash, GetHandleId(t), 4, lvl)
         SaveReal(Hash, GetHandleId(t), 5, POISON_DART_STEP(lvl))
         SaveInteger(Hash, GetHandleId(t), 6, level)
         TimerStart(t, POISON_DART_PER, true, function MoveShall)
          
         u = null; t = null; d = null
     }