internal void PrepareForPlanningPhase(PlayLayer pl)
{
// first check the aggro
// i.e. if an enemy (i.e. a player aircraft) is close enough break formation
// also if one of the aircrafts is damaged break formation too
if (InFormation)
{
foreach (var aircraft in pl.PlayerAircrafts)
{
if (CCPoint.Distance(aircraft.Position, Position) < AggroRange)
{
//Console.WriteLine("TRIGGERED - DISTANCE");
InFormation = false;
break;
}
}
foreach (var aircraft in AircraftsWithRelPositions.Keys)
{
if (aircraft.Health < aircraft.MaxHealth)
{
//Console.WriteLine("TRIGGERED - HP");
InFormation = false;
break;
}
}
}
foreach (var aircraft in AircraftsWithRelPositions.Keys)
{
aircraft.PrepareForPlanningPhase();
}
if (!InFormation)
{
return; // squadrons only control their units while in formation
}
//Console.WriteLine("FLYING IN FORMATION");
const float dt = Constants.TURN_DURATION;
// if you're too close to the current Waypoint roll a new one
var diff = WayPoint - Leader.Position;
float advanceDistance = Velocity * dt;
if (diff.Length < advanceDistance)
{
GenerateWayPoint();
diff = WayPoint - Leader.Position;
}
LeaderWayPoint = Leader.Position + CCPoint.Normalize(diff) * advanceDistance;
// rotate all formation positions correctly around the leader and tell everyone to go to their positions
float angle = Constants.DxDyToRadians(diff.X, diff.Y);
foreach (var entry in AircraftsWithRelPositions)
{
var formationPoint = CCPoint.RotateByAngle(entry.Value, CCPoint.Zero, angle);
var yourWaypoint = LeaderWayPoint + formationPoint;
entry.Key.TryToSetFlightPathHeadTo(yourWaypoint);
}
}
/// <summary>
/// Returns the (relative) rotation angle (for MyRotation) indicating how far into which direction the weapon
/// should be turned to be able to hit the target perfectly.
/// </summary>
/// <returns></returns>
internal float AngleToAimFor()
{
// as there is no exact solution the solution is here approched by iteration
CCPoint TargetToMyPart = MyPart.PositionWorldspace - TargetPart.PositionWorldspace;
// rotate the vector, so that the movement direction of the target is identical to the x axis
float transformationRotation = -Constants.DxDyToRadians(TargetAircraft.VelocityVector.X, TargetAircraft.VelocityVector.Y);
TargetToMyPart = CCPoint.RotateByAngle(TargetToMyPart, CCPoint.Zero, transformationRotation);
// now the cordinate system is simpler and we can compute the difference between
// a) the intersection of the flight path and the bullet path
// and b) the point where the target actually is going to be by then
// of course we want to minimize this error, for this we will iterate
// ITERATION USING THE BISECTION METHOD
double epsilon = 1;
double angle = 0;
// define the interval
double startAngle = Constants.DxDyToRadians(-TargetToMyPart.X, -TargetToMyPart.Y);
double endAngle = 0;
float totalBulletVelocity = ProjectileBlueprint.Velocity + AircraftVelocityBoost();
double deltaStart = TargetToMyPart.X - TargetToMyPart.Y / Math.Tan(startAngle) + (TargetToMyPart.Y * TargetAircraft.VelocityVector.Length) / (Math.Sin(startAngle) * totalBulletVelocity);
for (int i = 0; i < 6; i++) // iterate 6 times at max
{
angle = (startAngle + endAngle) / 2;
double delta = TargetToMyPart.X - TargetToMyPart.Y / Math.Tan(angle) + (TargetToMyPart.Y * TargetAircraft.VelocityVector.Length) / (Math.Sin(angle) * totalBulletVelocity);
if (Math.Abs(delta) < epsilon) // you're close enough so break already
break;
// delta is negative when the bullet hits behind the part -> angle needs to be closer to 0
if (Math.Sign(deltaStart) == Math.Sign(delta))
{
startAngle = angle;
deltaStart = delta;
}
else
{
endAngle = angle;
}
}
// subtract the transformation rotation to get the total angle
float totalAngle = Constants.RadiansToCCDegrees((float)angle - transformationRotation);
// for the final angle transform the total angle to a relative angle
return Constants.AngleFromToDeg(((IGameObject)MyPart.Parent).TotalRotation, totalAngle);
}