Changing Sprites Color According to Value

Questions & Answers
1

Hey,
It is quite hard to explain what I want but here it goes. First take a look at my script:

#pragma strict

var Food:UnityEngine.UI.Image; 
var WaterDrop:UnityEngine.UI.Image; 

var health = 100.0;

var hunger = 100.0;
var hungerSpeed = .1;

var thirst = 100.0;
var thirstSpeed = .2;

function Update ()
{
    hunger -= Time.deltaTime * hungerSpeed;
    thirst -= Time.deltaTime * thirstSpeed;
}

What I would like to happen is: as the hunger / thirst goes down, I would like the corresponding UISprites to change depending on the value. e.g. 100.0 = Bright Green. 00.0 = Bright Red 50.0 = Yellow and all the other colors inbetween, almost as if they are fading.
I hope I explained it well enough.
Sorry for bad english.
Thanks for help!

2

here is code but not tested but it work

var renderer:SpriteRenderer ;//drag your spriteObject
    function Update()
    {
    //SpriteRenderer renderer = //Get the renderer via GetComponent or have it cached previously
    if(health==100)
    renderer.color = Color.green;
    else if(health<=50)
    renderer.color = Color.yellow;
    else if (health==0)
    renderer.color = Color.red;
    }
3

For the color calculation you could do something like this (c#):

Starting color is green:

Color hungerColor = Color.green;

in Update():

if ( hunger >= 50.0f)
{
    // While hunger value decreases (to 50%), add more red until you get yellow color (1,1,0)
    hungerColor.r = 2.0f - ( 2.0f * hunger)/100.0f;
}
else if ( hunger > 0.0f) // don't go below zero
{
    // Hunger value is below 50%, remove green component from color until you get red (1,0,0)
    hungerColor.g = 2.0f * hunger / 100.0f;
}

and assign this color to the color component of your sprite