using UnityEngine;
using System.Collections;

public class ShowFpsOnGUI : MonoBehaviour {

    public float fpsMeasuringDelta = 2.0f;

    private float timePassed;
    private int m_FrameCount = 0;
    private float m_FPS = 0.0f;

    private void Start() {
        timePassed = 0.0f;
    }

    private void Update() {
        m_FrameCount = m_FrameCount + 1;
        timePassed = timePassed + Time.deltaTime;

        if (timePassed > fpsMeasuringDelta) {
            m_FPS = m_FrameCount / timePassed;

            timePassed = 0.0f;
            m_FrameCount = 0;
        }
    }

    private void OnGUI() {
        GUIStyle bb = new GUIStyle();
        bb.normal.background = null;
        bb.normal.textColor = new Color(1.0f, 0.5f, 0.0f);
        bb.fontSize = 30;

        //居中显示FPS
        GUI.Label(new Rect(Screen.width - 200, 2, 200, 200), "FPS: " + m_FPS.ToString("f2"), bb);
    }
}