OnGUI().Slider - Alternative

Question

I'm brazilian and my english is basic.

I'm building a 'car game'. I have Forward/Backward buttons and a Slider that turns the car, included inner the OnGUI function.

But I'm having a problem with the multitouch. I know that OnGUI does not accept multitouch.

I need an 'alternative' for the horizontal slider, that does not use OnGUI function.

If you can give me an 'button' alternative, I will be grateful too.

Horizontal slider code:

 function OnGUI()
 {
         if (Input.touchCount > 0) //if the player touches the screen the slider will be changed
         {
             carmovepark1.HoriGUI = GUI.HorizontalSlider (Rect (Screen.width /25, Screen.height - Screen.height /10, Screen.width /3.8, Screen.height /16), carmovepark1.HoriAll, -30.0, 30.0);
         }
         else // the slider go to '0' value (starting value)
         {
             carmovepark1.HoriGUI = GUI.HorizontalSlider (Rect (Screen.width /25, Screen.height - Screen.height /10, Screen.width /3.8, Screen.height /16), 0, -30.0, 30.0);    
         }            
 }

'carmovepark1.HoriGUI' = Var that controls the car rotation. Placed in another script.

Answer 1

Here is a very basic button. Attach it to any game object and drag whatever camera you are using for the interface onto the cam variable. The logic here might give you a start on your slider. BTW did you consider making finger movement anywhere not on a control steer the car rather than a slider? It would be easier to implement and perhaps easier for the user.

 using UnityEngine;
 using System.Collections;
 
 public class SimpleButton : MonoBehaviour
 {
     public Camera cam;
     public Color colorFlash = new Color(0.75f, 0.75f, 0.75f);
 
     void Update ()
     {
     if (Input.touchCount == 1 && Input.touches[0].phase == TouchPhase.Began)
         {
             Ray ray = cam.ScreenPointToRay(Input.touches[0].position);
             RaycastHit hit;
             if (Physics.Raycast (ray, out hit))
             {
                 if (hit.collider.gameObject == gameObject)
                 {
                     Debug.Log ("Button hit...put code to do domething here");
                     StartCoroutine("FlashButton");  // Do something for user feedback
                 }
             }
         }
     }
     
     IEnumerator FlashButton()
     {
         Color colorT = renderer.material.color;
         renderer.material.color = colorFlash;
         yield return new WaitForSeconds(0.25f);
         renderer.material.color = colorT;
     }
 }

OnGUI().Slider - Alternative

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