Project Name: Shark Attack

// SHARK ID: 1608

new sharkobject;
new Float: playerPos[MAX_PLAYERS][3];
new thisplayerfollowingbyshark[MAX_PLAYERS];
new Float: startedfollowinghere[MAX_PLAYERS][3];

stock IsPlayerSwimming(playerid)
{
	new result = 0; // starting as player is not swimming and it will be change as 1 if player is swimming.
	if(GetPlayerAnimationIndex(playerid) == 1538
	|| GetPlayerAnimationIndex(playerid) == 1539
	|| GetPlayerAnimationIndex(playerid) == 1540
	|| GetPlayerAnimationIndex(playerid) == 1541
	|| GetPlayerAnimationIndex(playerid) == 1542
	|| GetPlayerAnimationIndex(playerid) == 1543
	|| GetPlayerAnimationIndex(playerid) == 1544
	|| GetPlayerAnimationIndex(playerid) == 1250)
	{
	    result = 1; // I found out this animations to check is player swimmming.
	}
	return result;
}

forward EachSecond();
public EachSecond()
{
	foreach(Player, i) // foreach is better than counting to 500 (I mean Max players)
	{
	    if(thisplayerfollowingbyshark[i] == 1)
	    {
	        new Float: HP;
	        GetPlayerHealth(i, HP);
	        SetPlayerHealth(i, HP-2); // each second a bite and each bite 2 hp.
        	new Float: fDistance = GetPlayerDistanceFromPoint(i, startedfollowinghere[i][0], startedfollowinghere[i][1], startedfollowinghere[i][2]);
			if(fDistance == 40)
			// player got away from shark, actually got away from the shark's original position.
			// If That's not right, just text me to fix it, I mean If I did not get right write it :)
			{
                thisplayerfollowingbyshark[i] = 0;
                MoveObject(sharkobject, 884.9488,-2006.6652,-0.2070,4.0,179.5435,46,26); // let it go to it's original location
			}
		}
	    if(IsPlayerSwimming(i)) // Firstly, we need to check this.
	    { // Yes, player is swimming, now let's check if player is near shark
	        new Float: x, Float: y, Float: z;
	        GetObjectPos(sharkobject, x, y, z);
			if(IsPlayerInRangeOfPoint(i, 5, x, y, z)) // to stop shark
			{
   				GetObjectPos(sharkobject, x, y, z);
   				MoveObject(sharkobject, x, y, z, 4.0);
			}
	        else if(IsPlayerInRangeOfPoint(i, 40, x, y, z)) // player is near shark, as you wanted 40 radius.
	        {
				thisplayerfollowingbyshark[i] = 1;
    	        GetPlayerPos(i, playerPos[i][0], playerPos[i][1], playerPos[i][2]); // We got positions
				startedfollowinghere[i][0] = playerPos[i][0];
				startedfollowinghere[i][1] = playerPos[i][1];
				startedfollowinghere[i][2] = playerPos[i][2];
				MoveObject(sharkobject,playerPos[i][0], playerPos[i][1], playerPos[i][2], 4.0); // used them here
				// as you wanted 4.0 speed.
	            SetObjectToFaceCords(sharkobject, playerPos[i][0], playerPos[i][1], playerPos[i][2]); // used them here, too.
			}
	    }
	    else // If Player is not swimming
	    {
            if(thisplayerfollowingbyshark[i] == 1) // and if player is following by shark
			{
                thisplayerfollowingbyshark[i] = 0;
                MoveObject(sharkobject, 884.9488,-2006.6652,-0.2070,4.0,179.5435,46,26); // let it go to it's original location
			}
	    }
	}
	return 1;
}

stock SetObjectToFaceCords(objectid, Float:x1,Float:y1,Float:z1) // taken from application.
{
   //   SetObjectToFaceCords() By LucifeR   //
   //                LucifeR@vgames.co.il   //

   // setting the objects cords
   new Float:x2,Float:y2,Float:z2;
   GetObjectPos(objectid, x2,y2,z2);

   // setting the distance values
   new Float:DX = floatabs(x2-x1);
   new Float:DY = floatabs(y2-y1);
   new Float:DZ = floatabs(z2-z1);

   // defining the angles and setting them to 0
    new Float:yaw = 0;
    new Float:pitch = 0;

    // check that there isnt any 0 in one of the distances,
   // if there is any  use the given parameters:
   if(DY == 0 || DX == 0)
   {
       if(DY == 0 && DX > 0) {
         yaw = 00;
         pitch = 0; }
      else if(DY == 0 && DX < 0) {
         yaw = 180;
         pitch = 180; }
      else if(DY > 0 && DX == 0)  {
         yaw = 90;
         pitch = 90; }
      else if(DY < 0 && DX == 0) {
         yaw = 270;
         pitch = 270; }
      else if(DY == 0 && DX == 0) {
         yaw = 0;
         pitch = 0; }
   }
// calculating the angale using atan
   else // non of the distances is 0.
   {
       // calculatin the angles
      yaw = atan(DX/DY);
      pitch = atan(floatsqroot(DX*DX + DZ*DZ) / DY);
      // there are three quarters in a circle, now i will
      // check wich circle this is and change the angles
      // according to it.
      if(x1 > x2 && y1 <= y2) {
          yaw = yaw + 90;
         pitch = pitch - 45; }
        else if(x1 <= x2 && y1 < y2) {
          yaw = 90 - yaw;
         pitch = pitch - 45; }
        else if(x1 < x2 && y1 >= y2) {
          yaw = yaw - 90;
         pitch = pitch - 45; }
        else if(x1 >= x2 && y1 > y2) {
          yaw = 270 - yaw;
         pitch = pitch + 315; }

      // the pitch could be only in two quarters, lets see wich one:
        if(z1 < z2)
          pitch = 360-pitch;
   }
   // setting the object rotation (should be twice cuz of lame GTA rotation system)
   SetObjectRot(objectid, 0, 0, yaw);
   SetObjectRot(objectid, 0, pitch, yaw+90);
}