Rect transform

Hello.
I have created a .png composed by 97 images which were 60x60.
So, it's resolution is 5820x60, the size is 365Ko.

I would like to create an animated button based on that picture.
I have created a button with an image and a mask 60x60, and I created a child to it, where I put my png in the sprite component.

Now, I want to move it with a script, and it is where I have a problem. Here my script :

Code (CSharp):

1.  
2.  
3.     Vector2 move;
4.  
5.     void Start()
6.     {
7.         move.x = 0.0f;
8.         move.y = 0.0f;
9.     }
10.  
11.     void FixedUpdate ()
12.     {
13.             move.x -= 60.0f;
14.             GetComponent<RectTransform>().anchoredPosition = move;
15.  
16.           (if move.x <= 5820)
17.         {   move.x -= 0.0f;    }
18.     }
19.     }

So :
It work for the "Left" attribute of the Rect Transform, as it should, BUT it also modify the "right" attribute, so it doesn't work properly. I try a lot of things, but I cannot find a way to move ONLY the Left attribute.
Could you help me with that ?
Maybe, do you know a better solution to do that sort of animations which is not too heavy ?

Thanks.

 

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