LineRenderer 画图

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
public class Mspaint : MonoBehaviour
{
    
    
    
    public Color color = Color.red;  //画笔的颜色
    public float size = 0.1f;		 //画笔粗细
    public Material material;		 //材质球
    private LineRenderer currentLine;//当前的LineRenderer组件
    private List<Vector3> pos = new List<Vector3>(); //记录鼠标移动的位置点,赋值给LineRenderer组件使用
    private Vector3 lastMousePos = Vector3.zero;//记录上次鼠标的点,防止在鼠标不移动的情况下还继续向pos 加入坐标
    private int lineLayer = 1;			//每条线段的层级,控制线段覆盖在上一条线段上
    void Start()
    {
    
    
    	//选择画笔颜色的按钮
        Toggle[] colorGroup=this.transform.Find("ColorGroup").GetComponentsInChildren<Toggle>();
        //选择画笔粗细的按钮
        Toggle[] sizeGroup = this.transform.Find("SizeGroup").GetComponentsInChildren<Toggle>();
        for (int i = 0; i < colorGroup.Length; i++)
        {
    
    
            colorGroup[i].onValueChanged.AddListener(OnColorChanged);
        }
        for (int i = 0; i < sizeGroup.Length; i++)
        {
    
    
            sizeGroup[i].onValueChanged.AddListener(OnSizeChanged);
        }
    }
    private void OnColorChanged(bool ison)//改变画笔颜色的方法
    {
    
    
        GameObject game=EventSystem.current.currentSelectedGameObject;
        if (!ison)
        {
    
    
            return;
        }
        switch (game.name)
        {
    
    
            case "Red":
                color = Color.red;
                break;
            case "Blue":
                color = Color.blue;
                break;
            case "Green":
                color = Color.green;
                break;
        }
        Debug.Log("当前笔刷颜色: " + color);
    }
    private void OnSizeChanged(bool ison)//改变画笔粗细的方法
    {
    
    
        GameObject game = EventSystem.current.currentSelectedGameObject;
        if (!ison)
        {
    
    
            return;
        }
        switch (game.name)
        {
    
    
            case ".1":
                size = 0.1f;
                break;
            case ".2":
                size = 0.2f;
                break;
            case ".4":
                size = 0.4f;
                break;
        }
        Debug.Log("当前笔刷大小: "+size);
    }

    private Vector3 GetMousePoint()//获取鼠标射线碰撞点,用来确认线段点的位置
    {
    
    
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit ;
        if (Physics.Raycast(ray,out hit))
        {
    
    
            if (hit.collider!=null)
            {
    
    
                return hit.point;
            }
        }
        return Vector3.zero;
    }
    private void Update()
    {
    
    
        if (Input.GetMouseButtonDown(0))//鼠标按下
        {
    
    
            Vector3 startPos = GetMousePoint();
            lastMousePos = startPos;	//记录上次的鼠标点

            GameObject go = new GameObject(); //每个线段都得克隆一个GameObject 且添加LineRenderer
            go.transform.SetParent(this.transform);
            currentLine = go.gameObject.AddComponent<LineRenderer>();
            currentLine.material = material; //设置材质
            currentLine.startWidth = size;   //设置最开始的画笔大小
            currentLine.endWidth = size;	 //设置最后一笔的画笔大小
            currentLine.startColor = color;  //设置最开始颜色
            currentLine.endColor = color;	 //设置最后一笔的画笔颜色
            currentLine.numCornerVertices = 5; //设置画笔的线段点 ,数越大代表线段越圆润
            currentLine.numCapVertices = 5;	   //同上
            currentLine.sortingOrder = lineLayer;//设置线段的显示层级,保证这条线段的显示在上一条线段之上
            currentLine.SetPositions(pos.ToArray());//将鼠标位置数组赋值给线段
            lineLayer++;						//层级自加

            pos.Clear();						//清空集合
            pos.Add(startPos);					//加入起始位置
        }
        else if (Input.GetMouseButton(0))//持续按着鼠标
        {
    
    
            Vector3 position = GetMousePoint();
            if (Vector3.Distance(lastMousePos,position)>0.05f)//保证鼠标点开始移动,否则不加入鼠标位置点
            {
    
    
                lastMousePos = position;			  //记录上次位置
                position.z -= 0.01f;				  //防止被画板挡住
                pos.Add(position);					  //加入鼠标位置点
                currentLine.positionCount = pos.Count;//因为是数组,所以需先设置长度,否则只会显示两个点
                currentLine.SetPositions(pos.ToArray());//将鼠标位置数组赋值给线段
            }
            
        }
        else if (Input.GetMouseButtonUp(0))//鼠标抬起,全部重置
        {
    
    
            pos.Clear();					
            currentLine = null;
            lastMousePos = Vector3.zero;
        }
    }
}

1.材质球 2.线段的点的数组 3.画笔的颜色,可以设置渐变色 4.线段的顶点设置 5.线段的显示层级设置


材质球的设置

代码挂这