using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class FPS : MonoBehaviour
{
    public static bool showFPS = true;
    public static float fps;
    private static float frameCount;
    private static float elapse;
    private GUIStyle _fpsStyle;
    public GUIStyle fpsStyle
    {
        get
        {
            if (_fpsStyle == null)
            {
                int h = Screen.height;
                _fpsStyle = new GUIStyle();
                _fpsStyle.alignment = TextAnchor.UpperLeft;
                _fpsStyle.fontSize = h * 2 / 100;
                _fpsStyle.normal.textColor = Color.magenta;
            }
            return _fpsStyle;
        }
    }

    void Start()
    {
        Application.targetFrameRate = 0;
    }

    void OnGUI()
    {
        frameCount++;
        elapse += Time.unscaledDeltaTime;
        if (elapse >= 1)
        {
            fps = frameCount / elapse;
            elapse = 0;
            frameCount = 0;
        }
        if (!showFPS) return;

        string text = string.Format("FPS: {0:0.}", fps);
        int w = Screen.width, h = Screen.height;
        Rect rect = new Rect(20, h * 0.4f, w * 0.5f, h * 2 / 100);
        GUI.Label(rect, text, fpsStyle);
    }
}