DrawLine2D.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
namespace UnityLibrary
{
    public class DrawLine2D : MonoBehaviour
    {

        [SerializeField]
        protected LineRenderer m_LineRenderer;
        [SerializeField]
        protected bool m_AddCollider = false;
        [SerializeField]
        protected EdgeCollider2D m_EdgeCollider2D;
        protected List<Vector2> m_Points;

        public virtual LineRenderer lineRenderer {
            get {
                return m_LineRenderer;
            }
        }

        public virtual bool addCollider {
            get {
                return m_AddCollider;
            }
        }

        public virtual EdgeCollider2D edgeCollider2D {
            get {
                return m_EdgeCollider2D;
            }
        }

        public virtual List<Vector2> points {
            get {
                return m_Points;
            }
        }

        protected virtual void Awake()
        {
            if (m_LineRenderer == null)
            {
                Debug.LogWarning("DrawLine: Line Renderer not assigned, Adding and Using default Line Renderer.");
                CreateDefaultLineRenderer();
            }
            if (m_EdgeCollider2D == null && m_AddCollider)
            {
                Debug.LogWarning("DrawLine: Edge Collider 2D not assigned, Adding and Using default Edge Collider 2D.");
                CreateDefaultEdgeCollider2D();
            }
            m_Points = new List<Vector2>();
        }

        protected virtual void Update()
        {
            if (Input.GetMouseButtonDown(0))
            {
                Reset();
            }
            if (Input.GetMouseButton(0))
            {
                Vector2 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
                if (!m_Points.Contains(mousePosition))
                {
                    m_Points.Add(mousePosition);
                    m_LineRenderer.positionCount = m_Points.Count;
                    m_LineRenderer.SetPosition(m_LineRenderer.positionCount - 1, mousePosition);
                    if (m_EdgeCollider2D != null && m_AddCollider && m_Points.Count > 1)
                    {
                        m_EdgeCollider2D.points = m_Points.ToArray();
                    }
                }
            }
        }

        protected virtual void Reset()
        {
            if (m_LineRenderer != null)
            {
                m_LineRenderer.positionCount = 0;
            }
            if (m_Points != null)
            {
                m_Points.Clear();
            }
            if (m_EdgeCollider2D != null && m_AddCollider)
            {
                m_EdgeCollider2D.Reset();
            }
        }

        protected virtual void CreateDefaultLineRenderer()
        {
            m_LineRenderer = gameObject.AddComponent<LineRenderer>();
            m_LineRenderer.positionCount = 0;
            m_LineRenderer.material = new Material(Shader.Find("Particles/Additive"));
            m_LineRenderer.startColor = Color.white;
            m_LineRenderer.endColor = Color.white;
            m_LineRenderer.startWidth = 0.2f;
            m_LineRenderer.endWidth = 0.2f;
            m_LineRenderer.useWorldSpace = true;
        }

        protected virtual void CreateDefaultEdgeCollider2D()
        {
            m_EdgeCollider2D = gameObject.AddComponent<EdgeCollider2D>();
        }

    }
}