// dirty, because only the center of the bounding box + all points of the box are used to check the angle;
// this function is using CCDegrees
internal static bool CollideArcBoundingBox(CCPoint posCircle, float radius, float angleArcCenter, float angleHalfArcWidth, CCRect box)
{
if (CollideBoundingBoxCircle(box, posCircle, radius))
{
// check whether the center of the box is inside the arc
CCPoint vectorCirclePoint = box.Center - posCircle;
float anglePoint = Constants.DxDyToCCDegrees(vectorCirclePoint.X, vectorCirclePoint.Y);
float angleDifference = Constants.AbsAngleDifferenceDeg(angleArcCenter, anglePoint);
if (angleDifference <= angleHalfArcWidth)
{
return(true);
}
// check whether a point of the box is inside the arc
foreach (CCPoint point in Constants.CCRectPoints(box))
{
vectorCirclePoint = point - posCircle;
anglePoint = Constants.DxDyToCCDegrees(vectorCirclePoint.X, vectorCirclePoint.Y);
angleDifference = Constants.AbsAngleDifferenceDeg(angleArcCenter, anglePoint);
if (angleDifference <= angleHalfArcWidth)
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// Returns the Direction (in CCDegrees) of the segment
/// starting at pathIndex and ending at pathIndex +1.
/// For the Endpoint the same value is returned as for endIndex-1.
/// </summary>
/// <param name="pathIndex"></param>
/// <returns></returns>
internal float DirectionAt(int pathIndex)
{
if (pathIndex == Path.Length - 1)
{
pathIndex--;
}
return(Constants.DxDyToCCDegrees(Path[pathIndex + 1].X - Path[pathIndex].X, Path[pathIndex + 1].Y - Path[pathIndex].Y));
}
/// <summary>
/// called by the Aircraft owning the part owning this WeaponAbility each frame
/// </summary>
/// <param name="dt">time since the previous frame</param>
internal void ExecuteOrders(float dt)
{
// cool down
CooldownUntilNextShot -= dt;
CooldownUntilNextTargetUpdate -= dt;
if (CooldownUntilNextShot < 0) CooldownUntilNextShot = 0;
// if you have a target check if it is still in range
if (TargetPart != null)
{
CCPoint vectorMyPartTarget = TargetPart.PositionWorldspace - MyPart.PositionWorldspace;
if (TargetPart.MyState == Part.State.DESTROYED || (TargetAircraft != null && TargetAircraft.MyState == Aircraft.State.SHOT_DOWN)
|| CooldownUntilNextTargetUpdate <= 0
|| CCPoint.Distance(MyPart.PositionWorldspace, TargetPart.PositionWorldspace) > AttentionRange
|| Constants.AbsAngleDifferenceDeg(MyPart.TotalRotation - MyPart.RotationFromNull, Constants.DxDyToCCDegrees(vectorMyPartTarget.X, vectorMyPartTarget.Y)) > AttentionAngle)
TargetPart = null;
}
if (TargetPart == null && CooldownUntilNextTargetUpdate <= 0) // if you currently do not aim at anything search for a target
{
CooldownUntilNextTargetUpdate = UpdateTargetDelay;
// collect aircrafts that are near enough to have parts which could be targets
// go through the parts of all of these planes and collect those that are in the attention angle
PartsInRange(out List<Part> partsInRange, out List<float> anglesFromTo, out List<float> distances);
// try to choose a part that is in reach
// choose the part that is closest anglewise
// but prioritize aircraft bodies:
// this means that you should only change target from a body to another part if the part you would choose instead (because it's closer)
// belongs to another plane
float minAngle = float.PositiveInfinity;
for (int i=0; i<partsInRange.Count(); i++)
{
if (distances[i] <= ShootingRange) // first only try parts that are already in reach
{
float absAngle = (float)Math.Abs(anglesFromTo[i]);
var part = partsInRange[i];
if (absAngle < minAngle) //&&
//(TargetPart == null || !(part.Parent == TargetPart.Parent && TargetPart == TargetAircraft.Body))) // don't switch from a body to a different part of the same aircraft
{
TargetPart = part;
minAngle = absAngle;
}
}
}
if (TargetPart == null) // if you found no target this way check the rest
{
minAngle = float.PositiveInfinity;
for (int i = 0; i < partsInRange.Count(); i++)
{
float absAngle = (float)Math.Abs(anglesFromTo[i]);
var part = partsInRange[i];
// now also try parts that are not already in reach
if (absAngle < minAngle) //&&
//(TargetPart == null || !(part.Parent == TargetPart.Parent && TargetPart == TargetAircraft.Body))) // don't switch from a body to a different part of the same aircraft
{
TargetPart = part;
minAngle = absAngle;
}
}
}
}
// calculate the perfect point to aim for in order to hit the target
if (TargetPart != null)
{
float angleToAimFor = AngleToAimFor();
if (!(MyPart is WingJet)) // a dirty fix to make sure jet wings don't rotate since rotation screws up the flip state; for other weapons this effect can be neglected since it is only visual
{
float angleToTurnTo = angleToAimFor;
float angleTurn = Constants.AngleFromToDeg(MyPart.NullRotation, angleToTurnTo);
// make sure you don't rotate further than your MountPoint allows
if (angleTurn > MyPart.MountPoint.MaxTurningAngle)
angleToTurnTo = MyPart.NullRotation + MyPart.MountPoint.MaxTurningAngle;
else if (angleTurn < -MyPart.MountPoint.MaxTurningAngle)
angleToTurnTo = MyPart.NullRotation - MyPart.MountPoint.MaxTurningAngle;
// make sure you don't rotate further than this weapons MaxTurningAngle allows
if (MaxTurningAngle < MyPart.MountPoint.MaxTurningAngle)
{
if (angleTurn > MaxTurningAngle)
angleToTurnTo = MyPart.NullRotation + MaxTurningAngle;
else if (angleTurn < -MaxTurningAngle)
angleToTurnTo = MyPart.NullRotation - MaxTurningAngle;
}
MyPart.RotateTowards(angleToTurnTo, TurningAnglePerSecond * dt);
}
// if you're now close enough to the perfect angle (and in range) start shooting
if (CanShoot()
&& CCPoint.Distance(MyPart.PositionWorldspace, TargetPart.PositionWorldspace) <= ShootingRange
&& (Constants.AbsAngleDifferenceDeg(angleToAimFor, MyPart.MyRotation) <= ToleratedError || WouldHit()))
{
TryShoot();
}
}
// and if you have no target try to get back to NullRotation
else if (!(MyPart is WingJet))
{
MyPart.RotateTowards(MyPart.NullRotation, TurningAnglePerSecond * dt);
}
}
internal void PartsInRange(out List<Part> partsInRange, out List<float> anglesFromTo, out List<float> distances)
{
// collect aircrafts that are near enough to have parts which could be targets
List<Aircraft> aircraftsInRange = new List<Aircraft>();
foreach (var aircraft in (MyPart.Aircraft.Team == Team.PlayerTeam ? ((PlayLayer)MyPart.Layer).ActiveAircrafts : ((PlayLayer)MyPart.Layer).PlayerAircrafts)) // a bit dirty since technically NPC allies to the player could exist (someday), which would not be contained in PlayerAircrafts, but which would still (maybe) be part of the player team
{
// check if it is considered an enemy
if (!MyPart.Aircraft.Team.IsEnemy(aircraft.Team) || aircraft.MyState.Equals(Aircraft.State.SHOT_DOWN))
continue;
// check if in attention arc
if (Collisions.CollideArcBoundingBox(MyPart.PositionWorldspace, AttentionRange, MyPart.TotalNullRotation, AttentionAngle, aircraft.BoundingBoxTransformedToWorld))
aircraftsInRange.Add(aircraft);
}
partsInRange = new List<Part>();
anglesFromTo = new List<float>();
distances = new List<float>();
foreach (var aircraft in aircraftsInRange)
{
foreach (var part in aircraft.TotalParts)
{
if (part.MyState == Part.State.DESTROYED) continue;
// using the position as criterium is a bit dirty and could be improved on by using the bounding box instead (at the cost of performance)
CCPoint vectorMyPartPart = part.PositionWorldspace - MyPart.PositionWorldspace;
float distance = vectorMyPartPart.Length;
if (distance <= AttentionRange)
{
var angleFromTo = Constants.AngleFromToDeg(MyPart.TotalRotation - MyPart.RotationFromNull, Constants.DxDyToCCDegrees(vectorMyPartPart.X, vectorMyPartPart.Y));
if ((float)Math.Abs(angleFromTo) <= AttentionAngle)
{
partsInRange.Add(part);
anglesFromTo.Add(Constants.AngleFromToDeg(MyPart.TotalRotation, Constants.DxDyToCCDegrees(vectorMyPartPart.X, vectorMyPartPart.Y)));
distances.Add(distance);
}
}
}
}
}