PP.PaintLib/DrawBoard.cs

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace PP.PaintLib
{
    public class DrawBoard:IDisposable
    {
        /// <summary>
        /// 构造函数：初始化画板
        /// </summary>
        /// <param name="picBox">传入作为画板的控件：PictureBox</param>
        public DrawBoard(PictureBox picBox)
        {
            if (picBox != null)
            {
                if(picBox.Image!=null)
                {
                    image = picBox.Image;
                }
                else image = new Bitmap(picBox.Width, picBox.Height);
                this.picBox = picBox;
            }
        }


        #region 私有属性

        /// <summary>
        /// 绘图图形
        /// </summary>
        private ShapeType shapeType { get; set; } = ShapeType.Line;

        /// <summary>
        /// 绘图工具
        /// </summary>
        private ToolType toolType { get; set; } = ToolType.Pencil;

        /// <summary>
        /// 画笔
        /// </summary>
        private Pen pen = new Pen(Color.Black, 1);

        /// <summary>
        /// 起点、终点
        /// </summary>
        private Point startPoint = Point.Empty, endPoint = Point.Empty;

        /// <summary>
        /// 创建一个Image对象，用于绘制图像
        /// </summary>
        private Image image = null;

        /// <summary>
        /// 画布原型