// Update is called once per frame
void Update()
{
{
/*
* Section 6.17.4 Putting it all together!
*/
GameObject[] allObjects = FindObjectsOfType <GameObject>();
ArrayList zombies = new ArrayList();
ArrayList humans = new ArrayList();
// iterate through all game objects and find humans and zombies
foreach (GameObject go in allObjects)
{
HumanWithStates aHuman = go.GetComponent <HumanWithStates>() as HumanWithStates;
ZombieWithStates aZombie = go.GetComponent <ZombieWithStates>() as ZombieWithStates;
bool isHuman = aHuman != null;
bool isZombie = aZombie != null;
{
if (isHuman)
{
humans.Add(go);
continue; //added to skip the zombies.Add(go); statement.
}
if (!isHuman && isZombie)
{
zombies.Add(go);
}
}
}
GameObject[] theZombies = new GameObject [zombies.Count];
zombies.CopyTo(theZombies);
foreach (GameObject z in theZombies)
{
//check distance from zombie to all humans
foreach (GameObject h in humans)
{
float dist = (z.transform.position - h.transform.position).magnitude;
float tooCloseToZombie = 1.0f;
if (dist < tooCloseToZombie)
{
zombies.Remove(z);
}
}
}
float closestDistance = Mathf.Infinity;
GameObject closestTarget = null;
foreach (GameObject zombie in zombies)
{
float dist = (zombie.transform.position - transform.position).magnitude;
if (dist < closestDistance)
{
closestDistance = dist;
closestTarget = zombie;
}
}
if (closestTarget != null)
{
GunTurretController controller = GetComponent <GunTurretController>();
controller.ShootAtTarget(closestTarget);
Debug.DrawLine(closestTarget.transform.position, transform.position, Color.red);
}
}
}
void CheckOperators()
{
{
/*
* Section 6.21 Types and Operators
*/
float a = 1.0f;
float b = 3.0f;
bool c = a > b; // false
bool d = a < b; // true
Debug.Log("c:" + c + " d:" + d);
}
{
/*
* adding strings together
*/
string a = "hello, ";
string b = "world.";
string c = a + b;
Debug.Log("c: " + c);
}
{
/*
* More things you can do with strings
*/
string a = "hello, ";
string b = "world.";
bool c = a == b; // false
bool d = a == "world."; // true
bool e = a == "hello, "; // false
bool f = a != b; // true
string g = a + b; // hello, world.
/*
* Some things you can't do with strings
*/
// string f = a - b;
// string f = a * b;
// string f = a / b;
// bool g = a > b;
// bool g = a < b;
}
{
string a = "hello";
switch (a)
{
case "hello":
Debug.Log("a was hello");
break;
case "world":
Debug.Log("a was world");
break;
default:
break;
}
}
{
/*
* Section 6.21.1 GetType()
*/
int a = 7;
string b = "hello";
bool c = a.GetType() == b.GetType();
Debug.Log("a and b are the same type? " + c);
// "a and b are the same type? False
Debug.Log("a is type: " + a.GetType());
// a is type System.Int32
Debug.Log("b is type: " + b.GetType());
// b is type System.String
}
{
int a = 7;
string b = "7";
bool c = a.ToString() == b;
Debug.Log("a as a string is the same as b? " + c);
// "a as a string is the same as b? True"
}
{
int a = 7;
float b = 7.0f;
bool c = a == b;
Debug.Log("int a == float b? " + c);
// "int a == float b? True"
}
{
/*
* Section 6.21.2 More Type Casting
*/
int a = 7;
float b = 7.9f;
bool c = a == b; // false
/* ↑ ↓ ↓ */
/* │ │ └────┐ */
/* │ ┌─┴──┐ ┌─┴──┐ */
/* │ │ 7 │ == │7.9f│ */
/* │ └────┘ ↓ └────┘ */
/* │ ┌───────┐ */
/* └─────┤ False │ */
/* └───────┘ */
bool d = a == (int)b;
/* ↑ ↓ ↓ ↓ */
/* │ │ │ ┌─┴──┐ */
/* │ │ │ │7.9f│ */
/* │ │ │ └─┬──┘ */
/* │ │ └─→(int) cast to int */
/* │ │ ↓ */
/* │ ┌─┴──┐ ┌─┴──┐ */
/* │ │ 7 │ == │ 7 │ */
/* │ └────┘ ↓ └────┘ */
/* │ ┌──────┐ */
/* └─────┤ True │ */
/* └──────┘ */
Debug.Log("c: " + c + " d: " + d);
// c: False d: True
}
{
int a = 7;
string b = "7";
//bool c = a == (int)b;
// Cannot convert type 'string' to 'int'
}
{
GameObject a = GameObject.CreatePrimitive(PrimitiveType.Capsule);
GameObject b = GameObject.CreatePrimitive(PrimitiveType.Capsule);
bool c = a == b;
Debug.Log("GameObjects a == b? " + c);
// GameObjects a == b? False
int a_InstanceID = a.GetInstanceID();
int b_InstanceID = b.GetInstanceID();
Debug.Log("a_InstanceID: " + a_InstanceID);
// a_InstanceID: -2500
// though the number itself will change every time you run the game
Debug.Log("b_InstanceID: " + b_InstanceID);
// b_InstanceID: -2510
// though the number itself will change every time you run the game
Debug.Log("GameObjects a_InstanceID == b_InstanceID? " + c);
// GameObjects a_InstanceID == b_InstanceID? False
}
{
GameObject a = GameObject.CreatePrimitive(PrimitiveType.Capsule);
GameObject b;
b = a;
bool c = a == b;
Debug.Log("GameObject a == b? " + c);
// GameObject a == b? True
}
{
GameObject gameObject = GameObject.CreatePrimitive(PrimitiveType.Capsule);
int a = gameObject.GetInstanceID();
int b;
b = a;
bool c = a == b;
Debug.Log("InstanceIDs a == b? " + c);
// InstanceIDs a == b? True
}
{
/*
* Can Types be equal?
*/
GameObject a = GameObject.CreatePrimitive(PrimitiveType.Capsule);
GameObject b = GameObject.CreatePrimitive(PrimitiveType.Capsule);
Type aType = a.GetType();
Type bType = b.GetType();
bool c = aType == bType;
Debug.Log("aType: " + aType + " bType: " + bType + " aType == bType? " + c);
// aType: UnityEngine.GameObject bType: UnityEngine.GameObject aType == bType? True
}
{
GameObject a = GameObject.CreatePrimitive(PrimitiveType.Capsule);
a.AddComponent <ZombieComponent>();
// check if the GameObject a is a zombie by looking for the attached zombie component
ZombieComponent component = a.GetComponent <ZombieComponent>();
Type b = component.GetType();
Type c = typeof(ZombieComponent);
bool d = b == c;
Debug.Log("b type: " + b + "c type: " + c + "b == c?" + d);
}
{
System.Int32 a = 1;
int b = 3;
bool c = a.GetType() == b.GetType();
Debug.Log("a == b? " + c);
// "a == b? True
System.Single d = 1.0f;
float e = 3.0f;
bool f = d.GetType() == e.GetType();
Debug.Log("d == e? " + f);
// "d == e? True
}
{
/*
* 6.21.3 Type Aliasing
*/
MyOwnType a = 1;
Debug.Log("a is a: " + a.GetType());
// "a is a: System.Int16"
}
{
/*
* 6.21.4 Boxing and Unboxing
*/
GameObject a = GameObject.CreatePrimitive(PrimitiveType.Capsule);
// remember, HumanWithStates : ZombieWithStates?
ZombieWithStates b = a.AddComponent <HumanWithStates>();
/* ↑ ↑ */
/* └────────────────┬─────────────────┘ */
/* ┌──────┴─────────────┐ */
/* │types don't match │ */
/* │but HumanWithStates │ */
/* │inherits from │ */
/* │ZombieWithStates │ */
/* └────────────────────┘ */
GameObject c = GameObject.CreatePrimitive(PrimitiveType.Capsule);
MonoBehaviour d = c.AddComponent <ZombieWithStates>();
/* ↑ ↑ */
/* └────────────────┬─────────────────┘ */
/* ┌──────┴─────────────┐ */
/* │types don't match │ */
/* │either but │ */
/* │ZombieWithStates │ */
/* │inherits from │ */
/* │MonoBehaviour │ */
/* └────────────────────┘ */
object e = GameObject.CreatePrimitive(PrimitiveType.Capsule);
/* ↑ ↑ */
/* └─────┬─────┘ */
/* ┌──────┴─────────────┐ */
/* │GameObject inherits │ */
/* │from object │ */
/* │but every class in │ */
/* │C# inherits from │ */
/* │object! │ */
/* └────────────────────┘ */
object f = 1;
object g = 1.0f;
object h = new object[] { 1, 1.0f, e, d, c, b, a };
Debug.Log("what is h really? " + h);
// what is h really? System.Object[]
object[] objArray = h as object[];
foreach (object o in objArray)
{
if (o is GameObject)
{
Debug.Log("got a GameObject!");
}
}
// got a GameObject!
// got a GameObject!
// got a GameObject!
UnityEngine.Object[] allObjectsInTheScene = FindObjectsOfType <UnityEngine.Object>();
foreach (UnityEngine.Object o in allObjectsInTheScene)
{
Debug.Log("Object: " + o);
}
// all kinds of things!
}
}
