C#实现GDI+基本图的缩放、拖拽、移动示例代码如下：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;
namespace ResizableControls{    public partial class MainForm : Form    {        /// <summary>        ///  有关鼠标样式的相关枚举        /// </summary>        private enum EnumMousePointPosition        {            MouseSizeNone = 0, //无            MouseSizeRight = 1, //拉伸右边框            MouseSizeLeft = 2,  //拉伸左边框            MouseSizeBottom = 3, //拉伸下边框            MouseSizeTop = 4, //拉伸上边框            MouseSizeTopLeft = 5,//拉伸左上角            MouseSizeTopRight = 6,//拉伸右上角            MouseSizeBottomLeft = 7,//拉伸左下角            MouseSizeBottomRight = 8,//拉伸右下角            MouseDrag = 9 //鼠标拖动        }        const int Band = 5;//范围半径        const int MinWidth = 10;//最低宽度        const int MinHeight = 10;//最低高度        private EnumMousePointPosition m_MousePointPosition; //鼠标样式枚举        private Point m_lastPoint; //光标上次移动的位置        private Point m_endPoint; //光标移动的当前位置
        public MainForm()        {            InitializeComponent();            //窗体中控件的事件晚期绑定            for (int i = 0; i < this.Controls.Count; i++)            {                this.Controls[i].MouseDown += new MouseEventHandler(MyMouseDown);                this.Controls[i].MouseLeave += new EventHandler(MyMouseLeave);                this.Controls[i].MouseMove += new MouseEventHandler(MyMouseMove);            }        }
        //鼠标按下事件        private void MyMouseDown(object sender,MouseEventArgs e)        {            m_lastPoint.X = e.X;            m_lastPoint.Y = e.Y;            m_endPoint.X = e.X;            m_endPoint.Y = e.Y;        }
        //鼠标离开控件的事件        private void MyMouseLeave(object sender, System.EventArgs e)        {            m_MousePointPosition = EnumMousePointPosition.MouseSizeNone;            this.Cursor = Cursors.Arrow;        }

        //鼠标移过控件的事件        private void MyMouseMove(object sender, MouseEventArgs e)        {            Control lCtrl = (sender as Control);//获得事件源            //左键按下移动            if (e.Button == MouseButtons.Left)            {                switch (m_MousePointPosition)                {                    case EnumMousePointPosition.MouseDrag:                        lCtrl.Left = lCtrl.Left + e.X - m_lastPoint.X;                        lCtrl.Top = lCtrl.Top + e.Y - m_lastPoint.Y;                        break;                    case EnumMousePointPosition.MouseSizeBottom:                        lCtrl.Height = lCtrl.Height + e.Y - m_endPoint.Y;                        m_endPoint.X = e.X;                        m_endPoint.Y = e.Y; //记录光标拖动的当前点
                        break;                    case EnumMousePointPosition.MouseSizeBottomRight:                        lCtrl.Width = lCtrl.Width + e.X - m_endPoint.X;                        lCtrl.Height = lCtrl.Height + e.Y - m_endPoint.Y;                        m_endPoint.X = e.X;                        m_endPoint.Y = e.Y; //记录光标拖动的当前点
                        break;                    case EnumMousePointPosition.MouseSizeRight:                        lCtrl.Width = lCtrl.Width + e.X - m_endPoint.X;                        //lCtrl.Height = lCtrl.Height + e.Y - m_endPoint.Y;                        m_endPoint.X = e.X;                        m_endPoint.Y = e.Y; //记录光标拖动的当前点  break;                    case EnumMousePointPosition.MouseSizeTop:                        lCtrl.Top = lCtrl.Top + (e.Y - m_lastPoint.Y);                        lCtrl.Height = lCtrl.Height - (e.Y - m_lastPoint.Y);
                        break;                    case EnumMousePointPosition.MouseSizeLeft:                        lCtrl.Left = lCtrl.Left + e.X - m_lastPoint.X;                        lCtrl.Width = lCtrl.Width - (e.X - m_lastPoint.X);
                        break;                    case EnumMousePointPosition.MouseSizeBottomLeft:                        lCtrl.Left = lCtrl.Left + e.X - m_lastPoint.X;                        lCtrl.Width = lCtrl.Width - (e.X - m_lastPoint.X);                        lCtrl.Height = lCtrl.Height + e.Y - m_endPoint.Y;                        m_endPoint.X = e.X;                        m_endPoint.Y = e.Y; //记录光标拖动的当前点   break;                    case EnumMousePointPosition.MouseSizeTopRight:                        lCtrl.Top = lCtrl.Top + (e.Y - m_lastPoint.Y);                        lCtrl.Width = lCtrl.Width + (e.X - m_endPoint.X);                        lCtrl.Height = lCtrl.Height - (e.Y - m_lastPoint.Y);                        m_endPoint.X = e.X;                        m_endPoint.Y = e.Y; //记录光标拖动的当前点
                        break;                    case EnumMousePointPosition.MouseSizeTopLeft:                        lCtrl.Left = lCtrl.Left + e.X - m_lastPoint.X;                        lCtrl.Top = lCtrl.Top + (e.Y - m_lastPoint.Y);                        lCtrl.Width = lCtrl.Width - (e.X - m_lastPoint.X);                        lCtrl.Height = lCtrl.Height - (e.Y - m_lastPoint.Y);   break;                    default:                        break;                }                if (lCtrl.Width < MinWidth) lCtrl.Width = MinWidth;                if (lCtrl.Height < MinHeight) lCtrl.Height = MinHeight;            }            else            {                 //'判断光标的位置状态                 m_MousePointPosition = MousePointPosition(lCtrl.Size, e);
                switch (m_MousePointPosition)  //改变光标                {                    case EnumMousePointPosition.MouseSizeNone:                        this.Cursor = Cursors.Arrow;//箭头                        break;                    case EnumMousePointPosition.MouseDrag:                        this.Cursor = Cursors.SizeAll;//四方向                        break;                    case EnumMousePointPosition.MouseSizeBottom:                        this.Cursor = Cursors.SizeNS;//南北                        break;                    case EnumMousePointPosition.MouseSizeTop:                        this.Cursor = Cursors.SizeNS;//南北                        break;                    case EnumMousePointPosition.MouseSizeLeft:                        this.Cursor = Cursors.SizeWE;//东西                        break;                    case EnumMousePointPosition.MouseSizeRight:                        this.Cursor = Cursors.SizeWE;//东西                        break;                    case EnumMousePointPosition.MouseSizeBottomLeft:                        this.Cursor = Cursors.SizeNESW;//东北到南西                        break;                    case EnumMousePointPosition.MouseSizeBottomRight:                        this.Cursor = Cursors.SizeNWSE;//东南到西北                        break;                    case EnumMousePointPosition.MouseSizeTopLeft:                        this.Cursor = Cursors.SizeNWSE;//东南到西北                        break;                    case EnumMousePointPosition.MouseSizeTopRight:                        this.Cursor = Cursors.SizeNESW;//东北到南西                        break;                    default:                        break;                }            }        }        //坐标位置判定        private EnumMousePointPosition MousePointPosition(Size size, System.Windows.Forms.MouseEventArgs e)        {            if ((e.X >= -1 * Band) | (e.X <= size.Width) |                (e.Y >= -1 * Band) | (e.Y <= size.Height))            {                if (e.X < Band)                {                    if (e.Y < Band)                   {                        return EnumMousePointPosition.MouseSizeTopLeft;                     }                    else                    {                        if (e.Y > -1 * Band + size.Height)                        {                           return EnumMousePointPosition.MouseSizeBottomLeft;                        }                        else                        {                          return EnumMousePointPosition.MouseSizeLeft;                        }                    }                }                else                {                    if (e.X > -1 * Band + size.Width)                    {                        if (e.Y < Band)                        { return EnumMousePointPosition.MouseSizeTopRight; }                        else                        {                            if (e.Y > -1 * Band + size.Height)                            { return EnumMousePointPosition.MouseSizeBottomRight; }                            else                            { return EnumMousePointPosition.MouseSizeRight; }                        }                    }                    else                    {                        if (e.Y < Band)                        { return EnumMousePointPosition.MouseSizeTop; }                        else                        {                            if (e.Y > -1 * Band + size.Height)                            { return EnumMousePointPosition.MouseSizeBottom; }                            else                            { return EnumMousePointPosition.MouseDrag; }                        }                    }                }            }            else            { return EnumMousePointPosition.MouseSizeNone; }        }    }}