How to paint over the area under the line?

Question

Graphic arts

So, we have a line with 64 points. Each point moves at a certain moment and it is necessary to fill the area under the line, in theory, spriteShape works approximately the same way. It can be done through spriteShape, but I still haven’t figured it out, the line movement code is very simple. I would be grateful for any help!

public float range = 5000f;

    public int number = 64;
    public float[] znachenia;

    public LineRenderer line;

    public int spec;

    [Range(0, 1)]
    public float speedAnimation;

    private void Awake() 
    {
        for(int i = 0;i < number; i++)
        {
            Vector3 posInArray = new Vector3(0,0,0);
            if(i>0)
                posInArray = line.GetPosition(i-1);
            line.SetPosition(i,posInArray+new Vector3(0.2f,0,0));
        }    
    }
  
  void Update () {
        float[] spectrum = new float[spec];
        GetComponent<AudioSource>().GetSpectrumData(spectrum, 0, FFTWindow.BlackmanHarris);

        for(int i = 0;i < number; i++)
        {
            line.SetPosition(i,Vector3.Lerp(line.GetPosition(i),new Vector3(line.GetPosition(i).x,(range * spectrum[i] + znachenia[i])/2),speedAnimation));
            znachenia[i] = range * spectrum[i];
        }
    }

Answer 1

Supplement the line to a closed polygon and paint over probably.