Flashlight battery script

Questions & Answers
1

Hi everyone. I am trying to write a script that will make a spotlight/flashlight run for a certain amount of time, flicker and make a buzzing sound after say 10 minutes and dim slightly, then turn off completely after another 5 minutes. I also tried to make a script so the player could pick up batteries which would replenish the flashlight. So far total failure. I am new to scripting so scripting in JavaScript would be great. Could I have some help with this, please?
Thanks for any input.

2

public float FlashlightTime = 1000f; //change the 1000 to add or subtract time.

    private void Start()
        {
            timeStarted = Time.time;      
        }
        private void Update()
        {
        
            if (Time.time > timeStarted+ FlashlightTime)
            {
               //do stuff
        }
    }

This is in c# remeber to mark as answered.

3

Here is a starter flashlight battery script. It uses an Animation curve, so you will need to author how you want the flashlight to behave over time. Attach it to a light and click on the public ac property. You can zoom in and change the characteristics of nodes.

using UnityEngine;
using System.Collections;

public class Flashlight : MonoBehaviour
{
	public float fRunTimeFullCharge = 900.0f;
	public AnimationCurve ac = new AnimationCurve();

	float fTimer = 0.0f;
	float fMaxIntensity;
	public float chargeLevel; // Can't set level here
	
	public void SetChargeLevel(float fCharge)
	{
		fTimer = (1.0f - Mathf.Clamp01(fCharge)) * fRunTimeFullCharge; 
		Debug.Log (fTimer);
	}
	
	void Start ()
	{
		Light light = GetComponent<Light>();
		fMaxIntensity = light.intensity;
		chargeLevel = 1.0f;
	}
	
	void Update ()
	{
		if (fTimer < 0.0f || fTimer > fRunTimeFullCharge)
			return;
		chargeLevel = fTimer/fRunTimeFullCharge;
		light.intensity = ac.Evaluate (chargeLevel);
		fTimer += Time.deltaTime;
	}

}

And here is the animation curve I used for testing. The flashing is pulled out in the circle.

6818-curve.jpg
6818-curve.jpg800×455 46.2 KB

4

This is in JavaScript so you know :smiley:

Added a display for the battery also…

//Name this script Flashlight and attach it to your player for instance

var lightSource : Light; //Connect the light source in the Inspector
static var maxEnergy : float = 100; //The energy amount of the flashlight
private var currentPower;
var turnedOn : boolean = false; //Boolean to check whether it's turned on or off
var drainSpeed : float = 2.0; //The speed that the energy is drained
private var alpha : float;               
private var duration : float = 0.2;     
private var baseIntensity : float;
var rectHeight: float;

function Update () {
    if (Input.GetKeyDown(KeyCode.F)) ToggleFlashlight();
    if(currentPower < maxEnergy/4 && lightSource.enabled){ 
                var phi : float = Time.time / duration * 2 * Mathf.PI;
                var amplitude : float = Mathf.Cos( phi ) * .5 + baseIntensity;
                lightSource.light.intensity = amplitude + Random.Range(0.1, 1.0) ;
        }
        lightSource.light.color = Color(alpha/maxEnergy, alpha/maxEnergy, alpha/maxEnergy, alpha/maxEnergy);
        alpha = currentPower;  
		
		if (turnedOn==true) {
			if(currentPower > 0.0) currentPower -= Time.deltaTime * drainSpeed; 
	        if(currentPower <= 0.0) {lightSource.enabled = false;}
		}
		if (turnedOn==false) {
		if(currentPower < maxEnergy) currentPower += Time.deltaTime * drainSpeed/2; 
		}
}

//When the player press F we toggle the flashlight on and off
function ToggleFlashlight () {
    turnedOn=!turnedOn;
    if (turnedOn && maxEnergy>0) {
       TurnOnAndDrainEnergy();
    } else {
       lightSource.enabled = false;
    }
}

//When the flashlight is turned on we enter a while loop which drains the energy
function TurnOnAndDrainEnergy () {
    lightSource.enabled = true;
    while (turnedOn && maxEnergy>0) {
       maxEnergy -= drainSpeed*Time.deltaTime;
       yield;
    }
    lightSource.enabled = false;
}

//This is called from outside the script to alter the amount of energy
static function AlterEnergy (amount : int) {
    maxEnergy = Mathf.Clamp(maxEnergy+amount, 0, 100);
}

//Display current battery on your flashlight
function OnGUI () {
      GUI.Label (Rect(70, Screen.height/rectHeight - 75,150,60), "Battery:   " + maxEnergy.ToString("F0") + "%");
}