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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.IO;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ScreenshortDemo
{
    public partial class MainForm : Form
    {
        private ScreenForm fs = new ScreenForm();
        private Bitmap curBitmap;
        public MainForm()
        {
            InitializeComponent();
        }
        private void MainForm_load(object sender,EventArgs e)
        {
            fs.ScreenShotOk = new EventHandler(ScreenShortOk_Click);
        }
        private void ScreenShortOk_Click(object sender,EventArgs e)
        {
            Bitmap bmp = new Bitmap(fs.End.X - fs.Start.X, fs.End.Y - fs.Start.Y);
            using (Graphics g = Graphics.FromImage(bmp))
            {
                int w = fs.End.X - fs.Start.X;
                int h = fs.End.Y - fs.Start.Y;
                Rectangle destRect = new Rectangle(0, 0, w 1, h 1);
                Rectangle srcRect = new Rectangle(fs.Start.X, fs.Start.Y, w 1, h 1);
                g.DrawImage(curBitmap, destRect, srcRect, GraphicsUnit.Pixel);
            }
            this.pictureBox1.Image = bmp;
            this.Show();
        }
        public Bitmap  GetScreen()
        {
            Rectangle ScreenArea = Screen.GetWorkingArea(this);
            Bitmap bmp = new Bitmap(ScreenArea.Width, ScreenArea.Height);
            using (Graphics g = Graphics.FromImage(bmp))
            {
                g.CopyFromScreen(0, 0, 0, 0, new Size(ScreenArea.Width, ScreenArea.Height));

            }
            return bmp;
        }
        #region 菜单事件
        ///新建截图
        ///
        private void SMINEW_Click(object sender,EventArgs e)
        {
            tsbSave_Click(sender, e);
        }
        ///菜单栏发送
        ///
        private void SMISEND_Click(object sender,EventArgs e)
        {
            MessageBox.Show("未实现");
        }

        /// <summary>
        /// 菜单栏退出
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void SMIEXIT_Click(object sender,EventArgs e)
        {
            if(MessageBox.Show ("are you sure to exit?","Info",MessageBoxButtons.OKCancel )==DialogResult.OK)
            {
                this.Close();
            }
        }
        ///菜单栏复制
        ///
        private  void SMICOPY_Click(object sender,EventArgs e)
        {
            tsbCopy_Click(sender, e);
        }
        ///
        private void SMIPEN_Click(object sender,EventArgs e)
        {
            MessageBox.Show("若使用此功能，请点击工具栏按钮！！！");
        }
        private void SMILIGHTPEN_Click(object sender,EventArgs e)
        {
            tsbLightPen_Click(sender, e);
        }
        private void SMIERASER_Click(object sender,EventArgs e)
        {
            tsbEraser_Click(sender, e);
        }
        private void SMIOPERATION_Click(object sender,EventArgs e)
        {
            MessageBox.Show("还未实现");
        }
        private void SMIHELP_Clock(object sender,EventArgs e)
        {
            MessageBox.Show("还未实现！");

        }
        /// <summary>
        /// /////////////////////////////////////////////////////////////////////////
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void SMIABOUT_Click(object sender,EventArgs e)
        {
            
        }
        #endregion

        #region 鼠标事件
        ///鼠标按下
        ///
        private void pictureBox_MouseDown(object sender,MouseEventArgs  e)
        {
            if (e.Button == MouseButtons.Left && this.pictureBox1.StartDraw == true)
            {
                this.pictureBox1.OnMouseDown(e.Location);
            }
        }
        ///鼠标弹起
        ///
        private void pictureBox_Mouse_Up(object sender,MouseEventArgs e)
        {
            if(e.Button ==MouseButtons.Left &&this.pictureBox1.StartDraw==true )
            {
                this.pictureBox1.OnMouseUp(e.Location);
            }
        }

        ///鼠标移动
        ///
        private void pictureBox_Mouse_Move(object sender,MouseEventArgs e)
        {
            if(e.Button ==MouseButtons.Left&&this.pictureBox1.StartDraw==true )
            {
                this.pictureBox1.SetPointAndRefresh(e.Location);
            }
        }

        #endregion

        #region 工具栏事件

        /// <summary>
        /// 新建截图
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbNew_Click(object sender, EventArgs e)
        {
            this.Hide();//隐藏当前
            this.pictureBox1.LineHistory.Clear();//清除绘制的历史线条
            this.pictureBox1.RectHistory.Clear();
            this.curBitmap = GetScreen();
            fs.BackgroundImage = this.curBitmap;
            fs.StartPosition = FormStartPosition.Manual;//起始位置
            fs.ShowDialog();

        }

        /// <summary>
        /// 保存功能
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbSave_Click(object sender, EventArgs e)
        {
            SaveFileDialog sfd = new SaveFileDialog();
            sfd.AddExtension = true;
            sfd.DefaultExt = "png";
            sfd.Filter = "PNG图片|*.png|JPG图片|*.jpg";
            sfd.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
            if (sfd.ShowDialog() == DialogResult.OK)
            {
                string fileName = sfd.FileName;
                Image image = this.pictureBox1.Image;
                using (Graphics g = Graphics.FromImage(image))
                {
                    this.pictureBox1.DrawHistory(g);
                }
                image.Save(fileName);
            }
        }

        /// <summary>
        /// 复制功能
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbCopy_Click(object sender, EventArgs e)
        {
            if (this.pictureBox1.Image != null)
            {
                Clipboard.SetDataObject(this.pictureBox1.Image);
                MessageBox.Show("已复制到剪贴板！");
            }
        }

        private void tsddbPen_DropDownItemClicked(object sender, ToolStripItemClickedEventArgs e)
        {
            var item = e.ClickedItem;
            if (item.Selected)
            {
                Color color = Color.FromName(item.Tag.ToString());
                this.toolStripSplitButton1.BackColor = color;
                this.pictureBox1.SetPen(color);
            }
        }

        /// <summary>
        /// 荧光笔
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbLightPen_Click(object sender, EventArgs e)
        {
            this.pictureBox1.SetLightPen();
        }

        /// <summary>
        /// 用图片生成指针样式
        /// </summary>
        /// <param name="cursor"></param>
        /// <param name="hotPoint"></param>
        public void SetCursor(Bitmap cursor, Point hotPoint)
        {
            int hotX = hotPoint.X;
            int hotY = hotPoint.Y;
            Bitmap myNewCursor = new Bitmap(cursor.Width * 2 - hotX, cursor.Height * 2 - hotY);
            Graphics g = Graphics.FromImage(myNewCursor);
            g.Clear(Color.FromArgb(0, 0, 0, 0));
            g.DrawImage(cursor, cursor.Width - hotX, cursor.Height - hotY, cursor.Width,
            cursor.Height);
            this.Cursor = new Cursor(myNewCursor.GetHicon());

            g.Dispose();
            myNewCursor.Dispose();
        }

        private void tsbDefault_Click(object sender, EventArgs e)
        {
            this.pictureBox1.SetDefault();
        }

        /// <summary>
        /// 橡皮擦功能
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbEraser_Click(object sender, EventArgs e)
        {
            this.pictureBox1.SetEarser();
        }

        /// <summary>
        /// 绘制矩形
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbRectangle_Click(object sender, EventArgs e)
        {
            this.pictureBox1.SetRectangle();
        }

        #endregion

        private void 文件ToolStripMenuItem_Click(object sender, EventArgs e)
        {

        }
    }
}