private void TryFireCannons()
{
//if (_ai.TimeUntilReloaded > 0 && false)
{
// return;
}
// Check that we aren't at too extreme an angle to fire (e.g. don't fire off the bow of the ship)
float angleTowardsPlayer = Util.AngleTowards(_h.SelfPos, _h.TargetPos);
float relativeAngle = Util.Clamp180(angleTowardsPlayer - _h.Heading);
// Angle will be the following:
// * 0: Front
// * 180: Back
// * 0 to 180: Right
// * -180 to 0: Left
if (Mathf.Abs(relativeAngle) < _h.Settings.MaxFiringAngle || Mathf.Abs(relativeAngle) > 180 - _h.Settings.MaxFiringAngle)
{
return;
}
// Check if we are in range, then if necessary, fire
float sqrDistance = _h.SqrDistanceTo(_h.TargetPos);
if (sqrDistance <= _h.Settings.CannonRange * _h.Settings.CannonRange)
{
int cannonIndex = relativeAngle <= 0 ?
_ai._Caravel.GetNextLeftCannonIndex() :
_ai._Caravel.GetNextRightCannonIndex();
var cannon = _ai._Caravel.GetCannon(cannonIndex);
if (Time.time - cannon.LastFireTime < _ai._AiSettings.ReloadTime ||
Time.time - _ai._lastFireTime < _ai._AiSettings.FireInterval)
{
return;
}
cannon.LastFireTime = Time.time;
_ai._lastFireTime = Time.time;
Vector3 spawnPos = cannon.SpawnPos.transform.position;
// Basic velocity prediction
// Predict how long a cannonball would take to land, if it was shot directly to where the target is right
// now.
// Then shoot the cannonball to where the target will be in that amount of time
// This isn't perfect because technically the amount of time for the cannonball to land is dependent on the
// distance to the target, so if we're changing the distance, we'll get a slightly different answer for where
// it will land.
// To solve this, we run multiple iterations of the prediction and cross our fingers it's close enough
Vector3 predictedTargetPos = Vector3.zero; // will be initialized in the for-loop
float predictedTime = _ai.PredictCannonballTime(spawnPos, _h.TargetPos, _h.Settings.CannonballSpeed, _h.Settings.CannonballGravity);
for (int i = 0; i < 25; i++)
{
predictedTargetPos = _h.TargetPos + predictedTime * _h.TargetVelocity;
predictedTime = _ai.PredictCannonballTime(spawnPos, predictedTargetPos, _h.Settings.CannonballSpeed, _h.Settings.CannonballGravity);
}
// TODO AI cannonballs inherit AI ship velocity, and update prediction to take this into account
GameObject instantiated = Instantiate(_ai._CannonballPrefab, spawnPos, Quaternion.identity);
Cannonball cannonball = instantiated.GetComponent <Cannonball>();
cannonball.Gravity = _h.Settings.CannonballGravity;
cannonball.Velocity = CalculateCannonballTrajectory(spawnPos, predictedTargetPos, _h.Settings.CannonballSpeed, _h.Settings.CannonballGravity);
cannonball.IgnoreCollisions = _h.Self;
_ai._Caravel.PlayCannonEffects(cannonIndex);
}
}
