/// <summary>
/// Infects this human if it is susceptible.
/// </summary>
public void Infect()
{
// the standard non-party case
if (LevelSettings.GetActiveSceneName() != "YouVsVirus_Leveldisco")
{
if (IsSusceptible())
{
SetCondition(EXPOSED);
}
}
else // the party case
{
if (IsSusceptible())
{
// both friend and player have a 10% chance of getting exposed
if (this.tag == "Player" || this.tag == "Friend")
{
if (UnityEngine.Random.value < 0.2)
{
SetCondition(EXPOSED);
}
}
// rest of npcs have increasing chance of getting infected
else if (UnityEngine.Random.value < num_inf * 0.028)
{
num_inf++;
SetCondition(EXPOSED);
}
}
}
}
/// <summary>
/// NPC random movement
/// if the velocity decreases the npc has some chance of changing their direction
/// then the velocity is gradually increased
/// </summary>
public void RandomMovement()
{
// checks if we need to increase the velocity
bool increase_vel = false;
// the velocity norm to check how fast we are going
float vel_norm = myRigidbody.velocity.sqrMagnitude;
// if we are getting too slow
if (vel_norm < MinVelocity)
{
// increase velocity later on
increase_vel = true;
// we have a 20% chance of changing our direction or we are at a dancefloor (or drunk) :-)
if (UnityEngine.Random.value < 0.2f || (LevelSettings.GetActiveSceneName() == "YouVsVirus_Leveldisco"))
{
// Random.onUnitSphere returns a random point on the surface of a sphere with radius 1
// so we do not change the velocity, just the direction
myRigidbody.velocity = UnityEngine.Random.onUnitSphere;
}
}
// Stop! This is too fast!
if (vel_norm > MaxVelocity)
{
vel_norm = MaxVelocity;
increase_vel = false;
}
// we are slow at the moment but do not want to become too fast
if (vel_norm < MaxVelocity && increase_vel == true)
{
// increase the velocity in every call to this function
myRigidbody.velocity *= (1f + AccelerationFactor);
}
}
void Update()
{
// let sprites reenter from right, frame count gives a smoother distribution of npcs
if (LevelSettings.GetActiveSceneName() == "YouVsVirus_Leveldemo" && Time.frameCount % 10 == 0)
{
ReenterScreenFromRight();
}
}
/// <summary>
/// FixedUpdate: FixedUpdate is often called more frequently than Update.
/// It can be called multiple times per frame, if the frame rate is low and
/// it may not be called between frames at all if the frame rate is high.
/// All physics calculations and updates occur immediately after FixedUpdate.
/// When applying movement calculations inside FixedUpdate, you do not need
/// to multiply your values by Time.deltaTime. This is because FixedUpdate
/// is called on a reliable timer, independent of the frame rate.
/// </summary>
void FixedUpdate()
{
if (CanMove())
{
// in the demo level the NPCs move from right to left
if (LevelSettings.GetActiveSceneName() == "YouVsVirus_Leveldemo")
{
myRigidbody.velocity = new Vector2(-0.5f, UnityEngine.Random.Range(-1.0f, 1.0f));
}
else
{
RandomMovement();
}
}
}