/// <summary>
/// Builds a list of targets which would be hit by a line attack performed by a siege cannon.
/// </summary>
/// <param name="instigator">The player firing the cannon.</param>
/// <returns>The farthest target from the siege weapon which would be struck by the attack, for use as the target of the ability.</returns>
public Unit BuildTargetList(Unit instigator)
{
CurrentTargetList.Clear();
Unit initialTarget = _weapon.CbtInterface.GetTarget(TargetTypes.TARGETTYPES_TARGET_ENEMY);
Unit bestTarget = initialTarget;
int bestDist = _weapon.GetDistanceToObject(initialTarget);
CurrentTargetList.Add(initialTarget);
Vector3 unitDir = new Vector3(initialTarget.WorldPosition.X - _weapon.WorldPosition.X,
initialTarget.WorldPosition.Y - _weapon.WorldPosition.Y,
initialTarget.WorldPosition.Z - _weapon.WorldPosition.Z);
unitDir.Normalize();
Vector3 toTarget = new Vector3();
Vector3 projection = new Vector3();
foreach (Object obj in _weapon.ObjectsInRange)
{
Unit unit = obj as Unit;
if (unit == null || unit == initialTarget || unit.Realm == instigator.Realm || !_weapon.IsObjectInFront(unit, 45) || !CombatInterface.CanAttack(instigator, unit))
{
continue;
}
// Determine whether this unit is within 5ft on either side of the cannon's attack.
// Unit vector in direction of cannon's view
projection.X = unitDir.X;
projection.Y = unitDir.Y;
projection.Z = unitDir.Z;
toTarget.X = unit.WorldPosition.X - _weapon.WorldPosition.X;
toTarget.Y = unit.WorldPosition.Y - _weapon.WorldPosition.Y;
toTarget.Z = unit.WorldPosition.Z - _weapon.WorldPosition.Z;
// Vector projection ((a dot ^b) ^b)
projection.Multiply(Vector3.DotProduct3D(toTarget, unitDir));
// Vector rejection (a - (a dot ^b) ^b)
toTarget.X -= projection.X;
toTarget.Y -= projection.Y;
toTarget.Z -= projection.Z;
if (toTarget.MagnitudeSquare < 60 * 60 && _weapon.LOSHit(unit)) // 5ft either side
{
CurrentTargetList.Add(unit);
// Select the target furthest away as the target of the ability, for the projectile effect to look best
if (!_weapon.IsWithinRadiusFeet(unit, bestDist))
{
bestTarget = unit;
bestDist = _weapon.GetDistanceToObject(bestTarget);
}
}
}
return(bestTarget);
}
