在这一节，实现绘制主角的功能。

笔刷显示逻辑

修改LevelEditor脚本，在其中新建一个枚举，用于存储笔刷类型

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using System;
using UnityEngine;

namespace ShootingEditor2D
{
    public class LevelEditor : MonoBehaviour
    {
        //...
        public enum BrushType
        {
            Ground,
            Player
        }

        BrushType mCurrentBrushType = BrushType.Ground;
        //...
        Lazy<GUIStyle> mRightButtonStyle = new Lazy<GUIStyle>(() =>
        {
            return new GUIStyle(GUI.skin.button)
            {
                fontSize = 25,
            };
        });
        private void OnGUI()
        {
            //修改之前的代码添加一个判断，在Draw模式下显示当前的笔刷名称
            var modeLabelRect = RectHelper.RectForAnchorCenter(Screen.width * 0.5f, 35, 300, 50);

            if (mCurrentOperateMode == OperateMode.Draw)
            {
                GUI.Label(modeLabelRect,mCurrentOperateMode + ":" + mCurrentBrushType,mModeLableStyle.Value);//
            }
            else
            {
                GUI.Label(modeLabelRect, mCurrentOperateMode.ToString(), mModeLableStyle.Value);
            }
            //...

            if (mCurrentOperateMode == OperateMode.Draw)//只有在绘制模式下才显示按钮
            {
                var groundButtonRect = new Rect(Screen.width - 110, 10, 100, 50);
                if (GUI.Button(groundButtonRect, "Ground", mRightButtonStyle.Value))
                {
                    mCurrentBrushType = BrushType.Ground;
                }

                var playerButtonRect = new Rect(Screen.width - 110, 70, 100, 50);
                if (GUI.Button(playerButtonRect, "Player", mRightButtonStyle.Value))
                {
                    mCurrentBrushType = BrushType.Player;
                }
            }
        }
        //...
    }
}

绘制逻辑

修改LevelEditor脚本，在其中的Update代码块中直接修改绘制逻辑

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if ((Input.GetMouseButtonDown(0) || Input.GetMouseButton(0)) && GUIUtility.hotControl == 0)
{
    if (mCanDraw && mCurrentOperateMode == OperateMode.Draw)
    {
        if (mCurrentBrushType == BrushType.Ground)//判断当前的笔刷
        {
            var groundPrefab = Resources.Load<GameObject>("Ground");
            var groundGameObj = Instantiate(groundPrefab,transform);
            groundGameObj.transform.position = mouseWorldPos;
            groundGameObj.name = "Ground";
            mCanDraw = false;

        }else if (mCurrentBrushType == BrushType.Player)//这里的Player依然用Ground代替
        {
            var groundPrefab = Resources.Load<GameObject>("Ground");
            var groundGameObj = Instantiate(groundPrefab, transform);
            groundGameObj.transform.position = mouseWorldPos;
            groundGameObj.name = "Player";

            groundGameObj.GetComponent<SpriteRenderer>().color = Color.cyan;
            mCanDraw = false;
        }
    }else if(mCurrentObjectMouseOn && mCurrentOperateMode == OperateMode.Erase)
    {
        Destroy(mCurrentObjectMouseOn);
        mCurrentObjectMouseOn=null;
    }
}