How to detect a touch inside a GUI

Hello,

I'm new with Unity and i try to detect if the player's finger is in a certain part of the screen that will works a little bit like a virtual joystick.

I wrote this :

             Touch touch = Input.GetTouch(0);
 
             if((touch.position.x >= wheelCanonImage.rectTransform.position.x
                && touch.position.x <= (wheelCanonImage.rectTransform.position.x + wheelCanonImage.rectTransform.sizeDelta.x))
                 && touch.position.y >= wheelCanonImage.rectTransform.position.y
                 && touch.position.y <= (wheelCanonImage.rectTransform.position.y + wheelCanonImage.rectTransform.sizeDelta.y)){
                 touchText.text = "INSIDE !";
             }
             else{
                 touchText.text = "Out";
             }

Where wheelCanonImage is a Image type (the image in the canvas for the UI). This code works, but i'm sure there is a way less less awful than that in Unity.

Thanks already for the help !