yichael_smartbow/Assets/BowArrow/Scripts/Game/Billboard.cs

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

public class Billboard : MonoBehaviour
{
    public TextMeshProUGUI speedText;
    private float arrowSpeed;
    private float arrowSpeedScale = 1;
    
    public static Billboard ins;

    void Awake() {
        ins = this;   
    }

    void OnDestroy() {
        if (ins == this) ins = null;
    }

    /**speed m/s */
    public void SetArrowSpeed(float value) {
        //转km/h
        this.arrowSpeed = value * 3600f / 1000f;
    }

    public void SetArrowSpeedScale(float value) {
        this.arrowSpeedScale = value;
    }

    public void ShowSpeed() {
        if (speedText) {
            speedText.text = (this.arrowSpeed * this.arrowSpeedScale).ToString($"f{CommonConfig.arrowSpeedPrecision}");
        }
    }
}