GGJ_2021/Assets/Scripts/UI/StartScreen/StartScreenUI.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using TMPro;
using Variables;

public class StartScreenUI : MonoBehaviour
{

    [SerializeField]
    private Reference<float> m_StartTime;

    [SerializeField]
    private TextMeshProUGUI m_countdownText;

    [SerializeField]
    private AnimationCurve m_lerpCurve;

    [SerializeField]
    private Transform m_startPosition;

    [SerializeField]
    private Transform m_endPosition;




    private void OnEnable()
    {
        m_StartTime.OnValueChanged += UpdateCountDown;
    }


    private void OnDisable()
    {
        m_StartTime.OnValueChanged -= UpdateCountDown;
    }


    private void UpdateCountDown(float value)
    {

        m_countdownText.text = ((int)value).ToString();
        float ratio = m_lerpCurve.Evaluate(value % 1);

        m_countdownText.transform.position = Vector3.Lerp(m_endPosition.position, m_startPosition.position, ratio);
    }

    [ContextMenu("Do Count Down")]
    private void CountDown()
    {
        StartCoroutine(CountToZero(m_StartTime));
        
    }

    private IEnumerator CountToZero(float start)
    {
        m_StartTime.Value = start;
        while (m_StartTime > 0)
        {
            m_StartTime.Value -= Time.deltaTime;
            yield return new WaitForEndOfFrame();
        }
    }


}