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

public class PointLight : MonoBehaviour
{
    public int SamplesCount = 5;
    public float Angle = 45.0f;




    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        
    }

   
    public Ray2D[] GetRays() {
        float angleRad = Mathf.Deg2Rad * Angle;
        float halfAngleRad = angleRad / 2.0f;

        if(SamplesCount == 1) {
            halfAngleRad = 0;
        }

        float startAngle = 2.5f * Mathf.PI - halfAngleRad;
        float endAngle = 2.5f * Mathf.PI + halfAngleRad;

        Ray2D[] result = new Ray2D[SamplesCount];

        float step = angleRad / (SamplesCount - 1);

        if (SamplesCount > 1) {
            for (int i = 0; i < SamplesCount; i++) {
                float a = startAngle + step * i;
                result[i] = new Ray2D(transform.position, transform.TransformVector(new Vector3(Mathf.Cos(a), Mathf.Sin(a), 0.0f)).normalized);
            }
        } else {
            result[0] = new Ray2D(transform.position, transform.TransformVector( new Vector3(Mathf.Cos(startAngle), Mathf.Sin(startAngle), 0.0f)).normalized);
        }

        return result;
    }



    public bool DrawGizmo = true;
    private void OnDrawGizmos() {
        if (!DrawGizmo) {
            return;
        }
        var rays = GetRays();

        foreach (var ray in rays) {
            Gizmos.DrawLine(ray.origin, ray.origin + ray.direction * 0.5f);
        }

    }
}