Rect.width

Description

The width of the rectangle, measured from the X position.

Setting this value will also change xMax.

using UnityEngine;

public class RectExample : MonoBehaviour
{
    // Use this for initialization
    void Start()
    {
        Rect rect = new Rect(10, 10, 50, 30);
        Debug.Log("width = " + rect.width); // prints: width = 50
        rect.width = 20;
        Debug.Log("new max x = " + rect.xMax); // prints: new max x = 30
    }
}