Prevent a click/touch from going through GUI buttons.

In my game I want player to point gun where user clicks.
On left user can select different weapons. Everything is working except when I click on gun to select it, player points at that button. How can I avoid that.
if(Input.GetMouseButtonDown)
{
// rotate gun
}

Please help

 

I would also like to know how to prevent click throughs. Prior to Unity 4.6 r19 you could check Event manager to see if the mouse was over a GUI element like this :

Code (CSharp):

1. if (!EventSystemManager.currentSystem.IsPointerOverEventSystemObject())

Unfortunately in r19, EventManager was removed.

 

Scratch my last post;

Use this

Code (CSharp):

1. EventSystem.current.IsPointerOverGameObject()

It returns false if your mouse pointer is over the GUI

 

EventSystem class not found in unity. And also it will prevent selecting all the game objects.

here I want to exclude all buttons:
if(Input.GetButton ("Fire1"))
{
Vector3 difference = Camera.main.ScreenToWorldPoint (Input.mousePosition) - transform.position;
difference.Normalize (); //normalising the vector. Meaning all the sum of the vector will be equal to 1.

float rotZ = Mathf.Atan2 (difference.y, difference.x) * Mathf.Rad2Deg; //find the angle in degrees.
transform.rotation = Quaternion.Euler (0f, 0f, rotZ + rotationOffset);
}

 

You still need to import UnityEngine.EventSystems to use it.

 

Not working..is there anything in new unity 4.6 UI...

 

I got "true" when i'm on a unity 4.6 ui panel