Question

我想通过拖动鼠标绘制一些线条。我是用这个脚本做的。

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

public class DrawLine : MonoBehaviour 
{
    private LineRenderer line;
    private bool isMousePressed;
    private List<Vector3> pointsList;
    private Vector3 mousePos;

    // Structure for line points
    struct myLine
    {
        public Vector3 StartPoint;
        public Vector3 EndPoint;
    };
    //  ----------------------------------- 
    void Awake()
    {
        // Create line renderer component and set its property
        line = gameObject.AddComponent<LineRenderer>();
        line.material =  new Material(Shader.Find("Particles/Additive"));
        line.SetVertexCount(0);
        line.SetWidth(0.1f,0.1f);
        line.SetColors(Color.green, Color.green);
        line.useWorldSpace = true;  
        isMousePressed = false;
        pointsList = new List<Vector3>();
//      renderer.material.SetTextureOffset(
    }
    //  ----------------------------------- 
    void Update () 
    {
        // If mouse button down, remove old line and set its color to green
        if(Input.GetMouseButtonDown(0))
        {
            isMousePressed = true;
            line.SetVertexCount(0);
            //pointsList.RemoveRange(0,pointsList.Count);
            line.SetColors(Color.green, Color.green);
        }
        else if(Input.GetMouseButtonUp(0))
        {
            isMousePressed = false;
        }
        // Drawing line when mouse is moving(presses)
        if(isMousePressed)
        {
            mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
            mousePos.z=0;
            if (!pointsList.Contains (mousePos)) 
            {
                pointsList.Add (mousePos);
                line.SetVertexCount (pointsList.Count);
                line.SetPosition (pointsList.Count - 1, (Vector3)pointsList [pointsList.Count - 1]);
                if(isLineCollide())
                {
                    isMousePressed = false;
                    line.SetColors(Color.red, Color.red);
                }
            }
        }
    }
    //  ----------------------------------- 
    //  Following method checks is currentLine(line drawn by last two points) collided with line 
    //  ----------------------------------- 
    private bool isLineCollide()
    {
            //  if (gameObject.tag == "default") {

                        if (pointsList.Count < 2)
                                return false;
                        int TotalLines = pointsList.Count - 1;
                        myLine[] lines = new myLine[TotalLines];
                        if (TotalLines > 1) {
                                for (int i = 0; i < TotalLines; i++) {
                                        lines [i].StartPoint = (Vector3)pointsList [i];
                                        lines [i].EndPoint = (Vector3)pointsList [i + 1];
                                }
                        }
                        for (int i = 0; i < TotalLines - 1; i++) {
                                myLine currentLine;
                                currentLine.StartPoint = (Vector3)pointsList [pointsList.Count - 2];
                                currentLine.EndPoint = (Vector3)pointsList [pointsList.Count - 1];
                                if (isLinesIntersect (lines [i], currentLine))
                                        return true;
                        }
            //  }
        return false;
    }

    //  ----------------------------------- 
    //  Following method checks whether given two points are same or not
    //  ----------------------------------- 
    private bool checkPoints (Vector3 pointA, Vector3 pointB)
    {
        return (pointA.x == pointB.x && pointA.y == pointB.y);
    }
    //  ----------------------------------- 
    //  Following method checks whether given two line intersect or not
    //  ----------------------------------- 
    private bool isLinesIntersect (myLine L1, myLine L2)
    {
        if (checkPoints (L1.StartPoint, L2.StartPoint) ||
            checkPoints (L1.StartPoint, L2.EndPoint) ||
            checkPoints (L1.EndPoint, L2.StartPoint) ||
            checkPoints (L1.EndPoint, L2.EndPoint))
            return false;

        return((Mathf.Max (L1.StartPoint.x, L1.EndPoint.x) >= Mathf.Min (L2.StartPoint.x, L2.EndPoint.x)) &&
               (Mathf.Max (L2.StartPoint.x, L2.EndPoint.x) >= Mathf.Min (L1.StartPoint.x, L1.EndPoint.x)) &&
               (Mathf.Max (L1.StartPoint.y, L1.EndPoint.y) >= Mathf.Min (L2.StartPoint.y, L2.EndPoint.y)) &&
               (Mathf.Max (L2.StartPoint.y, L2.EndPoint.y) >= Mathf.Min (L1.StartPoint.y, L1.EndPoint.y)) 
               );
    }
}

enter image description here 现在当我的线与场景中的一些游戏对象发生碰撞时如何打印一些东西??? 这意味着当线与我的游戏对象发生碰撞时，我想说去另一个场景。

Answer 1

您可以在Update方法中使用LastPosition中的Raycast到CurrentPosition。 https://docs.unity3d.com/ScriptReference/Physics.Raycast.html 例： http://xenforo.unity3d.com/threads/general-purpose-method-for-better-collision-solving.64781/

如何在游戏对象与lineRender碰撞时检测碰撞？

1 个答案: