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   源码介绍

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/*********************************************
 * 
 * 用于捕获制定区域的窗口
 * 它表现为带有8个小方块的矩形
 * 8个小方块
 * 0－－1－－2
 * 3         4
 * 5－－6－－7
 * 一个拖动该变位置和大小
 * 将根据其区域内的图像来确定捕获的最终图像
 * -----------------------------------------
 *                     by zhouyinhui 2006_6_26
 *********************************************/

/*
 * 未解决的问题：
 * 
 * 拖动小方块以改变大小
 * 
 */ 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Text;
using System.Windows.Forms;

namespace QQCatchScreen
{
    public partial class FormCatcher : Form
    {
        public FormCatcher()
        {
            InitializeComponent();
        }

        public bool isMouseLeftDown = false;
        /// <summary>
        /// 鼠标按下时鼠标与窗体位置横坐标差
        /// </summary>
        public int dxCursorToWindow = 0;
        /// <summary>
        /// 鼠标按下时鼠标与窗体位置横坐标差
        /// </summary>
        public int dyCursorToWindow = 0;


        private void FormCatcher_Load(object sender, EventArgs e)
        {
            this.Resize  = new EventHandler(FormCatcher_Resize);
        }

        void FormCatcher_Resize(object sender, EventArgs e)
        {
            this.Refresh();
        }

        //绘制矩形边框与8个小方块
        private void FormCatcher_Paint(object sender, PaintEventArgs e)
        {
            using (Graphics g = e.Graphics)
            {
                Rectangle rect = new Rectangle(1, 1, this.ClientRectangle.Width - 3, this.ClientRectangle.Height - 3);
                g.DrawRectangle(Pens.Red, rect);

                //绘制小方块
                for (int i = 0; i <= 7; i  )
                {
                    g.FillRectangle(Brushes.Red, this.GetBoundsOfSmallBlock(i));
                }
            }
        }

        /// <summary>
        /// 获取指定序号的小方块的位置
        /// </summary>
        /// <param name="index"></param>
        /// <returns></returns>
        private Rectangle GetBoundsOfSmallBlock(int index)
        {
            int x =0;
            int y=0;
            int w=4;
            int h=4;

            switch (index)
            {
                case 0:
                case 3:
                case 5:
                    x = 0;
                    break;
                case 1:
                case 6:
                    x = this.ClientRectangle.Width / 2-3;
                    break;
                case 2:
                case 4:
                case 7:
                    x = this.ClientRectangle.Width - 4;
                    break;
                default:
                    throw new IndexOutOfRangeException("小方块序号错误，应该在［0，7］");
            }

            switch (index)
            {
                case 0:
                case 1:
                case 2:
                    y = 0;
                    break;
                case 3:
                case 4:
                    y = this.ClientRectangle.Height / 2-3;
                    break;
                case 5:
                case 6:
                case 7:
                    y = this.ClientRectangle.Height - 4;
                    break;
                default:
                    throw new IndexOutOfRangeException("小方块序号错误，应该在［0，7］");
            }

            return new Rectangle(x, y, w, h);
        }

        private void FormCatcher_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                this.isMouseLeftDown = true;
                this.dxCursorToWindow = Cursor.Position.X - this.Location.X;
                this.dyCursorToWindow = Cursor.Position.Y - this.Location.Y;
            }
        }

        private void FormCatcher_MouseUp(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                this.isMouseLeftDown = false;
                this.dxCursorToWindow = this.dyCursorToWindow = 0;
            }

        }

        private void FormCatcher_MouseLeave(object sender, EventArgs e)
        {
            this.isMouseLeftDown = false;
            this.dxCursorToWindow = this.dyCursorToWindow = 0;
        }

        private void FormCatcher_MouseMove(object sender, MouseEventArgs e)
        {
            
        }

        
    }
}