public static Dictionary <Type, ElementProximity> ComputeProximity(Player self, List <Element> elements)
{
var closest = new Dictionary <Type, ElementProximity>();
foreach (var elem in elements)
{
if (elem.Id == self.Id)
{
continue;
}
ElementProximity proximity = null;
Type type = elem.GetType();
// consolidate player types
if (elem is Player)
{
type = typeof(Player);
}
// consolidate obstacle types
if (elem is Obstacle)
{
type = typeof(Obstacle);
}
if (!closest.TryGetValue(type, out proximity))
{
proximity = new ElementProximity()
{
Name = type.Name,
Id = elem.Id,
Distance = float.MaxValue
};
closest.Add(type, proximity);
}
// calculate the distance between thees
var distance = Collision.DistanceBetweenPoints(self.X, self.Y, elem.X, elem.Y);
var angle = Collision.CalculateAngleFromPoint(self.X, self.Y, elem.X, elem.Y);
// retain only the closest
if (distance < proximity.Distance)
{
proximity.Id = elem.Id;
proximity.Angle = angle;
proximity.Distance = distance;
}
}
return(closest);
}
public override ActionEnum Action(List <Element> elements, float angleToCenter, bool inZone, ref float xdelta, ref float ydelta, ref float zdelta, ref float angle)
{
var playerCount = 0;
float playerX = 0;
float playerY = 0;
bool shouldMelee = false;
// find proximity to all types
var closest = AITraining.ComputeProximity(this, elements);
// gather details about if there is a crowd
foreach (var elem in elements)
{
if (elem.Id == Id)
{
continue; // found myself
}
if (!(elem is Player))
{
continue; // only care about players
}
playerCount++;
playerX += elem.X;
playerY += elem.Y;
}
// calculate the average center (if there are players near by)
if (playerCount >= 1)
{
playerX /= (float)playerCount;
playerY /= (float)playerCount;
}
// choose an action - set the rules in reverse order in order to set precedence
var action = ActionEnum.None;
xdelta = ydelta = angle = 0;
if (PreviousAngle < 0)
{
// choose an angle at random
PreviousAngle = Rand.Next() % 360;
}
angle = PreviousAngle;
// 3) Shield
if (Shield < Constants.MaxShield)
{
ElementProximity helmet = null;
if (closest.TryGetValue(typeof(Shield), out helmet))
{
// there is health either close or touching
if (IsTouching(helmet, Width / 2))
{
// choose to pickup
action = ActionEnum.Pickup;
// set direction via another decision
PreviousPickupId = helmet.Id;
}
else
{
// choose action via another decision
angle = helmet.Angle;
}
}
}
// 2) Health
if (Health < Constants.MaxHealth)
{
ElementProximity bandage = null;
if (closest.TryGetValue(typeof(Health), out bandage))
{
// there is health either close or touching
if (IsTouching(bandage, Width / 2))
{
// choose to pickup
action = ActionEnum.Pickup;
// set direction via another decision
PreviousPickupId = bandage.Id;
}
else
{
// choose action via another decision
angle = bandage.Angle;
}
}
}
// 1) Have weapon
if (Primary != null && Primary is RangeWeapon)
{
var weapon = Primary as RangeWeapon;
ElementProximity ammo = null;
// need ammo
if (weapon.Ammo < MinAmmo && closest.TryGetValue(typeof(Ammo), out ammo))
{
// there is ammo either close or touching
if (IsTouching(ammo, Width / 2))
{
// choose to pickup
action = ActionEnum.Pickup;
// set direction via another decision
PreviousPickupId = ammo.Id;
}
else
{
// choose action via another decision
angle = ammo.Angle;
}
}
// needs reload
if (!weapon.RoundsInClip(out int rounds) && rounds == 0 && weapon.HasAmmo())
{
// choose to reload
action = ActionEnum.Reload;
// choose direction via another decision
}
ElementProximity ak47 = null;
// pick up ak47
if (!(Primary is AK47) && closest.TryGetValue(typeof(AK47), out ak47))
{
// there is an AK47 either close or touching
if (IsTouching(ak47, Width / 2))
{
// choose to pickup
action = ActionEnum.Pickup;
// set direction via another decision
PreviousPickupId = ak47.Id;
}
else
{
// choose action via another decision
angle = ak47.Angle;
}
}
ElementProximity player = null;
// shoot a player
if (weapon.CanShoot() && closest.TryGetValue(typeof(Player), out player))
{
// choose to shoot
action = ActionEnum.Attack;
// move towards the player
angle = player.Angle;
}
}
// 0) No weapon
if (Primary == null || !(Primary is RangeWeapon))
{
// AI does not have a weapon, so go ahead and melee (if no other action)
shouldMelee = true;
// 0.b if near a player, melee
ElementProximity player = null;
if (closest.TryGetValue(typeof(Player), out player))
{
if (IsTouching(player, Fists.Distance))
{
// choose to melee
action = ActionEnum.Attack;
// turn towards the player
angle = player.Angle;
}
}
// 0.a is there a weapon within view
ElementProximity weapon = null;
if (!closest.TryGetValue(typeof(AK47), out weapon))
{
if (!closest.TryGetValue(typeof(Pistol), out weapon))
{
if (!closest.TryGetValue(typeof(Shotgun), out weapon))
{
}
}
}
if (weapon != null)
{
// there is a weapon either close or touching
if (IsTouching(weapon, Width / 2))
{
// choose to pickup
action = ActionEnum.Pickup;
// set direction via another decision
PreviousPickupId = weapon.Id;
}
else
{
// choose action via another decision
angle = weapon.Angle;
}
}
}
// if there are too many players, then run away
if (playerCount >= 5)
{
// choose an angle opposite from where the center of the other players are
angle = Collision.CalculateAngleFromPoint(X, Y, playerX, playerY);
// go the opposite way
angle = (angle + 180) % 360;
}
// choose defaults
if (action == ActionEnum.None)
{
// default to move
action = ActionEnum.Move;
}
// check if we are in the Zone
if (inZone)
{
// we should be moving towards the center
if (action == ActionEnum.Move)
{
// eek we are in the zone, indicate that we should be moving towards the center
angle = angleToCenter;
}
}
// check if we seem to be stuck
if (IsStuck())
{
// take some corrective action
if (ShowDiagnostics)
{
System.Diagnostics.Debug.WriteLine("AI seems stuck");
}
// try something new
angle = Rand.Next() % 360;
CorrectiveAngle = 0;
}
// check if our last movement was obstructed
float moveAngle = (angle + CorrectiveAngle) % 360;
if (CorrectiveAngle > 0)
{
CorrectiveAngle -= 15;
}
if (CorrectiveAngle < 0)
{
CorrectiveAngle = 0;
}
// save angle for next time
PreviousAngle = moveAngle;
// set course
float x1, y1, x2, y2;
Collision.CalculateLineByAngle(X, Y, moveAngle, 1, out x1, out y1, out x2, out y2);
xdelta = x2 - x1;
ydelta = y2 - y1;
// normalize
var sum = (float)(Math.Abs(xdelta) + Math.Abs(ydelta));
xdelta = xdelta / sum;
ydelta = ydelta / sum;
if (Math.Abs(xdelta) + Math.Abs(ydelta) > 1.0001)
{
throw new Exception("Invalid xdelta,ydelta : " + xdelta + "," + ydelta);
}
if (ShowDiagnostics)
{
System.Diagnostics.Debug.WriteLine("AI {0} {1} {2} {3}", action, angle, xdelta, ydelta);
}
// if our action is to move... do a melee while moving
if (action == ActionEnum.Move && shouldMelee)
{
return(ActionEnum.Attack);
}
else
{
return(action);
}
}
public bool IsTouching(ElementProximity element, float radius)
{
return(element.Distance < radius);
}