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Question by IvanNov3D · Dec 16, 2019 at 11:19 AM · scripting problemtouch controlszoom

Add touch control to script

Hi, Here i found some easy and really good script to make image zoomable movable in scene canvas. It works great on PC but on mobile i cant zoom in and out with fingers, only drag the picture. Could anyone help me how to fix it? I am new to unity so maybe someone can add the specific line to the script? Thank you.

 using UnityEngine;
  using UnityEngine.EventSystems;
   
  public class UIZoomImage : MonoBehaviour, IScrollHandler
  {
      private Vector3 initialScale;
   
      [SerializeField]
      private float zoomSpeed = 0.1f;
      [SerializeField]
      private float maxZoom = 10f;
   
      private void Awake()
      {
          initialScale = transform.localScale;
      }
   
      public void OnScroll(PointerEventData eventData)
      {
          var delta = Vector3.one * (eventData.scrollDelta.y * zoomSpeed);
          var desiredScale = transform.localScale + delta;
   
          desiredScale = ClampDesiredScale(desiredScale);
   
          transform.localScale = desiredScale;
      }
   
      private Vector3 ClampDesiredScale(Vector3 desiredScale)
      {
          desiredScale = Vector3.Max(initialScale, desiredScale);
          desiredScale = Vector3.Min(initialScale * maxZoom, desiredScale);
          return desiredScale;
      }
  }

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avatar image lgarczyn · Dec 18, 2019 at 02:38 PM 0
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Unity has an official tutorial on pinch to zoom: https://learn.unity.com/tutorial/getting-mobile-input

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