This is the note that stores my findings while doing the UTS FEIT31263 Game Development's assignment3

1. CSharp

1.1. ClampMagnitude

public static Vector3 ClampMagnitude(Vector3 vector, float maxLength);

Returns the copy of the Vector3 with its magnitude clamped to MaxLength

1.2. Properties in CSharp

Lets look at the grammar first

class Person
{
    private string _name;  // the name field
    
    public string Name    // the Name property
    {
        get => _name;
        set => _name = value; // value is a placeholder
    }
    private static GameSpeed currentSpeedState = 1;
    public static GameSpeed CurrentSpeedState
    {
        get { return currentSpeedState; }
        set {
            currentSpeedState = value;
            speedModifier = (float)value;
        }
    }
    void updata()
    {
        Person.CurrentSpeedState = (SpeedManager.GameSpeed)PlayerPrefs.GetInt("currentSpeedState");// when you want to use it, just assign the value to it 
    }
}

• "value" in the Setter is just a placeholder like other parameters in a function
• Properties is a constructor that have a getter and setter, you can set several things in setter.

1.3. Ways to Run a method later in sometime

1.3.1. Invoke()

Invoke("dosomething",2);//this will happen after 2 seconds

1.3.2. coroutines

 IEnumerator ExecuteAfterTime(float time)
 {
     yield return new WaitForSeconds(time);
 
     // Code to execute after the delay
 }

 StartCoroutine(ExecuteAfterTime(10));
//  OR

IEnumerator ExecuteAfterTime(float time, Action task)
 {
     if (isCoroutineExecuting)
         yield break;
     isCoroutineExecuting = true;
     yield return new WaitForSeconds(time);
     task();
     isCoroutineExecuting = false;
 }

1.4. Operators

1.4.1. Ternary Operator "?"

My example

void update(){
                SpeedManager.CurrentSpeedState =
                SpeedManager.CurrentSpeedState == SpeedManager.GameSpeed.Fast ?
                SpeedManager.GameSpeed.Slow :
                SpeedManager.GameSpeed.Fast ;
}

It looks like

condition ? statement 1 : statement 2

• the line I hightlighted is the start which is assign some value to CurrentSpeedState
• what I did follow is state a condition which is line 3
• and line 4&5 is the statement 1&2

1.5. InvokeRepeating and cancel repeat

If you wan to invoke a function/method after X seconds and repeat call it every Y seconds

1.5.1. InvokeRepeating

InvokeRepeating("LaunchProjectile", 2, 0.3F);
// start in 2s. repeat every 0.3s

1.5.2. Cancel repeat

CancelInvoke(); // this will cancle all the invokes in the enviroment.

1.6. Audio Control

1.6.1. Check audio status

AudioSource.isPlaying

public AudioClip otherClip;
AudioSource audioSource;
void Start()
{
    audioSource = GetComponent<AudioSource>();
}

void Update()
{
    if (!audioSource.isPlaying) // check status
    {
        audioSource.clip = otherClip;// change clips
        audioSource.Play();
    }
}

1.6.2. sequence play

play an audio file after another finishes

[RequireComponent(typeof(AudioSource))]
 public class LoopBGM : MonoBehaviour
 {
     public AudioClip StartClip;
     public AudioClip LoopClip;
 
     void Start()
     {
         StartCoroutine(playSound());
     }
 
     IEnumerator playSound()
     {
         GetComponent<AudioSource>().clip = StartClip;
         GetComponent<AudioSource>().Play();
         yield return new WaitForSeconds(StartClip.length);
         GetComponent<AudioSource>().clip = LoopClip;
         GetComponent<AudioSource>().Play();
         GetComponent<AudioSource>().loop = true;
     }
 }

1.7. Modify a list while using it

Normally, you can not do this because the unity does not allow you to modify it while in a foreach loop. So, what we can do is:

• Use a for loop instead
• Create a separate collection of the items you want to act on, then iterate over that.

Second approach

List<EduvisionUser> usersToRemove = new List<EduvisionUser>();
foreach (EduvisionUser aUser in users) --->***Exception thrown in this line***
{
    isUserAvailable = true;
    if(!aUser.Activated)
    {
        usersToRemove.Add(aUser);// Add to another list
    }
}
foreach (EduvisionUser userToRemove in usersToRemove)
{
    users.Remove(userToRemove);// delete the items in original list
}

2. Unity

2.1. trigger not working

This might because you set the "has exit time" checkbox to be checked. If you want to use the trigger to start the transition, you need to cancel that box.

    void SetTriggerToPacman()
    {
        //set a trigger for the state machine to change animation
        animator.SetTrigger("marked");
    }

    Invoke("SetTriggerToPacman", 1.5f);// Sometimes you need time for the transition. So you leave 1.5f here

2.2. Transform

2.2.1. Face the forward of a transform

transform.forward

2.3. Scene manager

2.3.1. check if scene is loaded

SceneManager.GetActiveScene () == SceneManager.GetSceneByName ("scene1")

2.3.2. Load scene

LoadScene(int sceneBuildIndex, SceneManagement.LoadSceneMode mode = LoadSceneMode.Single)
LoadScene(string sceneName, SceneManagement.LoadSceneMode mode = LoadSceneMode.Single);

load scene can load base on the name of the scene or the index of that scene

2.4. PlayerPrefs

2.4.1. Check if in the preferences have specific key

PlayerPrefs.HasKey(string Key)

2.4.2. PlayerPrefs.SetInt

set the value of the preference identiffied by key

    PlayerPrefs.SetInt(string key, int value);

2.5. Rigidbody

Set the Constraints of this Rigidbody to freeze the x, y and z rotation. This will stop our character from falling / rolling over due to gravity and the

2.6. Transform

Soem times the translate is werid. This is because the Transform.Translate() defaults to local space translation, which is affected by an object’s rotation.

Set Transform.Translate() to use Space.World.