Rotate dial to set values by dragging on the gameobject

Question

Hi, I'm setting up a script to attach to a dial gameObject on a control panel. When the user clicks and drags over the dial, the dial rotates and snaps into predetermined positions.

Once the script is attached to a dial, I set the number of stop positions then enter the angles for each of those stops in a list.

The script I have is working fine, but I'm just wondering how to better code the messy IF statements I'm using. It works great for up to 5 preset positions.....but I want it to be able to work on dials requiring any number of stops.

Any ideas? Thanks!

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
  
 public class DialRotate : MonoBehaviour {
    
     public List<float> rotationStop = new List<float>();
     public float sensitivity;
     public float dialValue = 0;
  
     // Update is called once per frame
     void Update () {
  
         // Set the maximun stop position to the total number of stops
         dialValue = Mathf.Clamp(dialValue, 0, rotationStop.Count -1);
  
         // Determine which stop is selected based on knob value from 0-1
         if (dialValue >= 0 && dialValue < 1)
             TurnDialTo(rotationStop[0]);
         if (dialValue >= 1 && dialValue < 2)
             TurnDialTo(rotationStop[1]);
         if (dialValue >= 2 && dialValue < 3)
             TurnDialTo(rotationStop[2]);
         if (dialValue >= 3 && dialValue <= 4)
             TurnDialTo(rotationStop[3]);
         if (dialValue >= 4 && dialValue <= 5)
             TurnDialTo(rotationStop[4]);
     }
  
     // Dragging on the gameobject increases or decreases dialvalue
     void OnMouseDrag ()
     {
         float dragMove = Input.GetAxis("Mouse X") * sensitivity;
         dialValue += dragMove;
     }
  
     // Rotates the knob to angle set in rotationStop
     void TurnDialTo (float position)
     {
         transform.rotation = Quaternion.Euler(0, position, 0);
     }
 }

Answer 1

Answer by moverend · Dec 12, 2015 at 07:27 AM

Thanks to @Sose for solving this for me. He suggested casting the float value of the rotations to an int that could be used to pick the matching index.

  void Update () {
    
             // Set the maximun stop position to the total number of stops
             dialValue = Mathf.Clamp(dialValue, 0, rotationStop.Count - 1);
     
             // Cast dialValue float to int and use as index
             int index = (int)dialValue;
             TurnDialTo(rotationStop[index]);
 }

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Answer 2

Answer by nik_2522 · Apr 17, 2016 at 12:15 PM

I want to do a similar thing, but just that I wish to allow the user to rotate the knob in only one direction. Do you have any idea should I approach it ?

Here is the link to my question : Link

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Rotate dial to set values by dragging on the gameobject

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