using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using UnityEngine.Profiling;
using UnityEngine.UI;

public class FPSDisplay : MonoBehaviour
{
    /// <summary>
    /// 用于显示FPS数据的Text
    /// </summary>
    public Text fpsText;

    // 帧率计算频率
    private const float calcRate = 0.5f;
    // 本次计算频率下帧数
    private int frameCount = 0;
    // 频率时长
    private float rateDuration = 0f;
    // 显示帧率
    private int fps = 0;

    protected bool fpsDisplay = false;

    void Start()
    {
        this.frameCount = 0;
        this.rateDuration = 0f;
        this.fps = 0;
    }

    void Update()
    {
        ++this.frameCount;
        this.rateDuration += Time.deltaTime;
        if (this.rateDuration > calcRate)
        {
            // 计算帧率
            this.fps = (int)(this.frameCount / this.rateDuration);
            this.frameCount = 0;
            this.rateDuration = 0f;
        }

        if (UnityEngine.Input.GetKeyDown(KeyCode.P))
            fpsDisplay = !fpsDisplay;
    }

    void OnGUI()
    {
        GUIStyle bb = new GUIStyle();
        bb.normal.background = null; //这是设置背景填充的
        //bb.normal.textColor = new Color(1, 1, 1,1);   //设置字体颜色的
        bb.fontSize = 30; //当然，这是字体颜色

        if (fpsDisplay)
            bb.normal.textColor = new Color(1, 1, 1, 1);   //设置字体颜色的
        else
            bb.normal.textColor = new Color(1, 1, 1, 0);

        string disStr = "";
        if (fps > 0)
            disStr += ("FPS：" + this.fps.ToString() + "\n");

        if (fpsText)
            fpsText.text = disStr;
        else
            GUI.Label(new Rect(20, 20, 300, 200), disStr,bb);
    }

    float ByteToM(long byteCount)
    {
        return (float)(byteCount / (1024.0f * 1024.0f));
    }
}