Rect.center

public Vector2 center ;

説明

矩形の中心座標

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public Rect rect = new Rect(0, 0, 100, 100);
    void Example() {
        print(rect.center);
        rect.center = new Vector2(10, 10);
    }
}