3D.ru

using UnityEngine;

public class LineDraw : MonoBehaviour {
    public float dist;

    [SerializeField]
    GameObject linePref;

    GameObject line;
    LineRenderer lineRender;
    EdgeCollider2D edgeCollider;
    Vector2[] positions = new Vector2[2];


    void Update () {
                if(Input.GetMouseButtonDown(0))
        {
            CreateFirstLinePoint();
        }
        if (Input.GetMouseButton(0))
        {
            CreateSecondLinePoint();
        }
       
    }


    void CreateSecondLinePoint()
    {
        positions[1] = Camera.main.ScreenToWorldPoint(Input.mousePosition);

        lineRender.SetPosition(1, positions[1]);
        edgeCollider.points = positions;
        }

    void CreateFirstLinePoint()
    {
        if (line)
        {
            DestroyLine();
        }
        positions[0] = (Camera.main.ScreenToWorldPoint(Input.mousePosition));

        line = Instantiate(linePref, Vector2.zero, Quaternion.identity);

        lineRender = line.GetComponent<LineRenderer>();
        edgeCollider = line.GetComponent<EdgeCollider2D>();

        lineRender.SetPosition(0, positions[0]);
    }

    void DestroyLine()
    {
        positions[0] = Vector2.zero;
        positions[1] = Vector2.zero;
        Destroy(line);
    }

}