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

public class CircleSurface : OpticalSurface2D
{

    public float Radius;
    public int ViewSamples = 15;

    void Start()
    {
        
    }

    void Update()
    {
        
    }

    private void OnValidate() {
        Shape = PointsToLines(GetGeometry(), true);
    }

    private Vector2[] GetGeometry() {
        Vector2[] result = new Vector2[ViewSamples];
        float da = Mathf.PI * 2 / ViewSamples;
        for (int i = 0; i < ViewSamples; i++) {
            float angle = da * i;
            result[i] = new Vector2(Mathf.Cos(angle) * Radius, Mathf.Sin(angle) * Radius);
        }
        return result;
    }

    public override bool Raycast(Ray2D ray, ref RaycastMath.RaycastResult2D result) {
        var localSpaceRay = new Ray2D( transform.InverseTransformPoint(ray.origin), transform.InverseTransformVector(ray.direction).normalized);
        if (RaycastMath.RaycastCircle(localSpaceRay, Radius, ref result)) {
            result.Point = transform.TransformPoint(result.Point);
            result.Normal = transform.worldToLocalMatrix.MultiplyVector(result.Normal).normalized;
            return true;
        }
        return false;
    }
}