Decrease 'Charge' of characters spotlight over time

Question

 var Charge = 100;
 
 var LightOn = 1;
 
 var LightOff = 0;
 
 private var isLightOn = false;
 
 function Update () {
 
 if(Input.GetKeyDown(KeyCode.Q)) {
     isLightOn = !isLightOn;
 }
     if(isLightOn == true) { 
             if(Charge &gt; 0){
             light.intensity = LightOn;
                           }
 }
     else{
         light.intensity = LightOff; 
 
 
         }
 }

Ok so that is my script, at the moment I have a spotlight attached to my character and when I press 'Q' it toggles on and off. What I want is to make it have a power source that will run out after a set amount of time, two minutes for example.

As you can see I have set the charge of my spotlight to 100 and it turns on only if the charge is more than 0 however despite trying InvokeRepeating and yield functions to minus 1 from charge every x seconds I could not find a solution.

Any help you can give me to show me how to slowly decrease the charge would be much appreciated (I will also need to increase it again but i can probably work that out myself with a script for decreasing the charge)

Scribe

Answer 1

Best Answer

Answer by Statement · Dec 07, 2010 at 08:31 PM

Let there be a max charge value such that Charge is between 0 and MaxCharge. Math.Lerp will give your light a gradient falloff between LightOff and LightOn.

light.intensity = Mathf.Lerp(LightOff, LightOn, Charge / MaxCharge);

Then you can simply reduce the charge such that:

Charge -= Time.deltaTime;

And you might want to make sure that the charge is in the correct interval:

Charge = Mathf.Clamp(Charge, 0, MaxCharge);

This give us functions we can use:

function DrainBattery() { Charge = Mathf.Clamp(Charge - Time.deltaTime, 0, MaxCharge); }

function UpdateLight() { light.intensity = Mathf.Lerp(LightOff, LightOn, Charge / MaxCharge); }

function CheckSwitch() { if (Input.GetKeyDown(KeyCode.Q)) light.enabled = !light.enabled; }

And you can use them in your update like such:

function Update()
{
    CheckSwitch();
    if (light.enabled)
    {
        DrainBattery();
        UpdateLight();
    }
}

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Ipsquiggle · Dec 07, 2010 at 09:18 PM 0

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This solution reduces the charge by 1 every second. For a different rate of discharge, add a multiplier to the deltaTime, something like Charge - Time.deltaTime * dischargeRate.

Scribe · Dec 08, 2010 at 05:15 PM 0

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thanks for replying, great help. Thanks again

Answer 2

Best Answer

Answer by Jesus_Freak · Dec 07, 2010 at 08:34 PM

var Charge = 100; var LightOn = 1;

var LightOff = 0;

private var isLightOn = false;

function Update () { Charge -= 1 * Time.deltaTime;// you can change 1 to any number to drain the charge over a shorter amt of time.

if(Input.GetKeyDown(KeyCode.Q)) { isLightOn = !isLightOn; } if(isLightOn == true) { if(Charge > 0) { light.intensity = LightOn; } } else{ light.intensity = LightOff; } }

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Scribe · Dec 08, 2010 at 05:16 PM 0

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thanks a lot for this

Answer 3

Answer by caderbyshire · Sep 17, 2012 at 09:36 PM

 var Charge : float = 2;
 var dischargeRate : float = 0.00666667;
 var noCharge : float = 0;
 @HideInInspector
 var lightEnabled = false;
 
 function Update()
 {
     if (Input.GetKeyDown(KeyCode.Q))
     {
         lightEnabled = !lightEnabled;
     }
         
     if (lightEnabled == true && Charge > noCharge)
     {
        light.intensity = Charge -= (Time.deltaTime * dischargeRate);
     }
     
     else 
     {
         light.intensity = noCharge;
     }
 }

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Decrease 'Charge' of characters spotlight over time

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