/* Performs a 180 degree sweep of multiple raycasts in front of the zombie,
* returning an array of RaycastSweepHit objects */
RaycastSweepHit[] RaycastSweep180(int numCasts = 9)
{
List <RaycastSweepHit> hits = new List <RaycastSweepHit>();
// Number of degrees to increment rotation by after each cast
float degreesIncrement = 180f / (float)numCasts;
// Temporarily disable boxcollider so we don't hit ourselves with the raycast
boxCollider.enabled = false;
// Do a 180 degree sweep of raycasts
for (float angleOffset = 0f; angleOffset <= 180f; angleOffset += degreesIncrement)
{
// Calculate direction for this raycast
Vector3 castDir = Quaternion.Euler(0, 0, angleOffset) * (-transform.up);
// Do the raycast
RaycastSweepHit hit = new RaycastSweepHit(Physics2D.Raycast(gameObject.transform.position, castDir), angleOffset);
hits.Add(hit);
// Draw a line showing the raycast, uncomment for debugging
Debug.DrawLine(gameObject.transform.position, hit.hit.point, Color.green);
}
// Re-enable boxcollider
boxCollider.enabled = true;
// Convert results to array and return
return(hits.ToArray());
}
/* Processes an array of RaycastSweepHit objects into a single ProcessedRaycastSweep
* object containing only the information needed to determine next actions. */
ProcessedRaycastSweep ProcessRaycastSweep(RaycastSweepHit[] hits)
{
// Highest cast distance we've seen so far
float highestDistance = 0.0f;
// Rotation angle offset corresponding with highest cast distance
float highestAngle = 0.0f;
// Shortes cast distance we've seen so far
float shortestDistance = float.MaxValue;
// Rotation angle offset corresponding with highest cast distance
float shortestAngle = 0.0f;
// Nearest follow-able zombie
RaycastSweepHit nearestZombieHit = null;
GameObject nearestZombie = null;
// Nearest follow-able zombie script
Zombie nearestZombieScript = null;
// nearest destructible object
RaycastSweepHit nearestDestructibleHit = null;
GameObject nearestDestructible = null;
foreach (RaycastSweepHit hit in hits)
{
// Did we hit a zombie?
if ("Zombie" == hit.hit.transform.gameObject.tag)
{
// Is it in a state that means it is following the player?
Zombie otherZombie = hit.hit.transform.gameObject.GetComponent <Zombie>();
if (nearestZombieHit == null || (hit.hit.distance < nearestZombieHit.hit.distance))
{
if (isWorthFollowing(otherZombie))
{
nearestZombieHit = hit;
nearestZombie = hit.hit.transform.gameObject;
}
}
}
// Did we hit a destructible wall?
else if (hit.hit.transform.parent != null)
{
if (hit.hit.transform.parent.gameObject.tag == "DestructibleBlock")
{
if ((nearestDestructibleHit == null) || (hit.hit.distance < nearestDestructibleHit.hit.distance))
{
nearestDestructibleHit = hit;
nearestDestructible = hit.hit.transform.gameObject;
}
}
}
// Keep track of shortest and longest raycast distance
if (hit.hit.distance > highestDistance)
{
highestDistance = hit.hit.distance;
highestAngle = hit.angle;
}
if (hit.hit.distance < shortestDistance)
{
shortestDistance = hit.hit.distance;
shortestAngle = hit.angle;
}
}
if (nearestZombie != null)
{
nearestZombieScript = nearestZombie.GetComponent <Zombie>();
}
return(new ProcessedRaycastSweep(nearestZombie, nearestZombieScript, nearestDestructible, highestAngle, shortestAngle));
}
