Easiest Way To Control (Transparency Pulse)

Hello! I was wondering what would be the simplest/most effecient way to program the transparency of a button to pulse back and fourth between .4 and 1?? If possible, it would also be nice to control the speed bounces back and fourth as well. Here's what I got for a start:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.UI;
5.  
6. public class ButtonTest : MonoBehaviour
7. {
8.     public Image buttonImage;
9.     public float transparency;
10.  
11.     void Update()
12.     {
13.         buttonImage.color = new Color(1,1,1,transparency);
14.         //Alpha goes back and fourth between 0 and 1 constantly
15.     }
16. }

Thank you for your time!

 

If you want to really control it, consider using an AnimationCurve. You can design the curve in the editor and read it in your code with AnimationCurve.Evaluate for the current time.

As for simple code based methods, look at Mathf.PingPong and of course, the classic Mathf.Sin.

 

That pingpong thing was JUST what I needed. How would I augment this, so that it doesn't go down to 0, but instead goes to .3?? I got this so far, but it goes ABOVE 1, and I don't want that

Code (CSharp):

1. public class ButtonTest : MonoBehaviour
2. {
3.     public Image buttonImage;
4.     public float transparency;
5.     public float changeSpeed;
6.  
7.  
8.     void Update()
9.     {
10.         buttonImage.color = new Color(1,1,1,transparency);
11.         transparency = Mathf.PingPong((Time.time) * changeSpeed, 1) + .3f;
12.     }
13. }

 

Code (CSharp):

1. float pingpong = Mathf.PingPong((Time.time) * changeSpeed, 1);
2. transparency = Mathf.Lerp(.3f, 1f, pingpong);

 

THANKYOU!!!! This is code is perfect for me, my question has been answered-!

Much appreciated Praetor-!