博客

public class LineCreater : BaseCreater
{
    private bool isDrawing;//是否在画线
    private LineRenderer wallLine;
    private Vector3 StartPosition, EndPosition;

    private float wallWidth = 0.5f;
    private float wallHeight = 3f;
    void Start()
    {

    }

    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            if (EventSystem.current != null && EventSystem.current.IsPointerOverGameObject())
            {
                //判断是否点击UI
                return;
            }

            var inputPosition = GetMousePosition();
            StartPosition = inputPosition;
            CreateLine(StartPosition);
        }

        if (Input.GetMouseButtonUp(0))
        {
            EndPosition = GetMousePosition();

            if ((EndPosition - StartPosition).sqrMagnitude > 1 * 1)
            {
                DrawLineFinished();
            }
            else
            {
                Destroy(wallLine.gameObject);
            }

            isDrawing = false;
        }

        if (isDrawing)
        {
            wallLine.SetPosition(1, GetMousePosition());
        }
    }

    /// <summary>
    /// 获取鼠标点击的坐标
    /// </summary>
    /// <returns></returns>
    private Vector3 GetMousePosition()
    {
        var ray = Camera.main.ScreenPointToRay(Input.mousePosition);

        RaycastHit hit;
        bool isCollider = Physics.Raycast(ray, out hit);
        if (isCollider)
        {
            return hit.point - new Vector3(0, 0, 0.01f);
        }
        return Vector3.zero;
    }

    /// <summary>
    /// 画线完成
    /// </summary>
    private void DrawLineFinished()
    {
        GetVertices();

        StartPosition = Vector3.zero;
        EndPosition = Vector3.zero;
    }

    /// <summary>
    /// 创建线
    /// </summary>
    void CreateLine(Vector3 start)
    {
        GameObject wall = new GameObject("wall");
        wall.transform.SetParent(transform);
        wallLine = wall.AddComponent<LineRenderer>();
        wallLine.startWidth = 0.05f;
        wallLine.endWidth = 0.05f;
        wallLine.SetPosition(0, start);
        isDrawing = true;
    }

}