CODEWITHSUNDEEP
unity-game-engine
icestorm0806
icestorm0806

Reputation: 711

How to change the size of circlecollider2d for X amount of time

I would like to use my circlecollider2d as a sort of force field to push objects back for a given amount of time, on button press. Here is the code I have, to simply turn it on and off again.

void Update()
{
    if (Input.GetKey(KeyCode.Space))
    {
        GetComponent<CircleCollider2D>().radius = 25.0f;
    }
    else
    {
        GetComponent<CircleCollider2D>().radius = 2.1f;
    }
}

Upvotes: 1

Views: 254

Answers (1)

Alex Myers
Alex Myers

Reputation: 7185

You can use Invoke to call a function after x number of seconds. I modified your code below to clear the force field 5 seconds after it is activated. The forceFieldActive flag will prevent it from being activated again while it's already active.

int forceFieldDuration = 5; //5 second duration
bool forceFieldActive = false;

void Update()
{
    if (Input.GetKey(KeyCode.Space) && forceFieldActive == false)
    {
        forceFieldActive = true;
        GetComponent<CircleCollider2D>().radius = 25.0f;
        Invoke("DisableForceField", 5);
    }
}

void DisableForceField()
{
    GetComponent<CircleCollider2D>().radius = 2.1f;
    forceFieldActive = false;
}

Note: You can also use a coroutine which is more efficient as Draco18s mentioned in the comments. It would look like this:

int forceFieldDuration = 5; //5 second duration
bool forceFieldActive = false;

void Update()
{
    if (Input.GetKey(KeyCode.Space) && forceFieldActive == false)
    {
        forceFieldActive = true;
        GetComponent<CircleCollider2D>().radius = 25.0f;
        StartCoroutine(DisableForceField());
    }
}

IEnumerator DisableForceField()
{        
    yield return new WaitForSeconds(forceFieldDuration);
    GetComponent<CircleCollider2D>().radius = 2.1f;
    forceFieldActive = false;
}

Upvotes: 3

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