C#鼠标拖动图片picturebox

 

/// 设置鼠标单击的坐标，以及图片的坐标
        /// 
        int mouseX;
        int mouseY;
        int picX;
        int picY;

        /// 
        /// 当鼠标单击时，给鼠标设定值。初始化。
        /// 
        /// 
        /// 
        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            mouseX = Cursor.Position.X;
            mouseY = Cursor.Position.Y;
            picX = this.pictureBox1.Left;
            picY = this.pictureBox1.Top;
            
            //if (isMouseMoveEventAviable == false)
            //    //添加鼠标移动事件
            //    this.movablePic.MouseMove += this.movablePic_MouseMove;
        }

        /// 
        /// 根据鼠标的移动的值，设置
        /// 
        /// 
        /// 
        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            int y = Cursor.Position.Y - mouseY + picY;
            int x = Cursor.Position.X - mouseX + picX;
            if (e.Button == MouseButtons.Left)
            {
                this.pictureBox1.Top = y;
                this.pictureBox1.Left = x;
            }
        }

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            mouseX = 0;
            mouseY = 0;
            if (this.pictureBox1.Location.X < 0  )
            {
                this.pictureBox1.Left = 0;
                
            }
            if ( this.pictureBox1.Location.Y < 0)
            {
                this.pictureBox1.Top = 0;
            }
            if ((this.pictureBox1.Left + this.pictureBox1.Width) > this.ClientSize.Width )
            {
                this.pictureBox1.Left = this.ClientSize.Width - this.pictureBox1.Width;
            }
            if ((this.pictureBox1.Top + this.pictureBox1.Height) > this.ClientSize.Height)
            {
                this.pictureBox1.Top = this.ClientSize.Height - this.pictureBox1.Height;
            }
        }

        private void Form1_Click(object sender, EventArgs e)
        {
            this.pictureBox1.Cursor = Cursors.SizeAll;
        }


////////////////////////////////////////////////////////////////////////////

<summary> 
        /// 设置鼠标单击的坐标，以及图片的坐标 
        /// </summary> 
        int mouseX; 
        int mouseY; 
        int picX; 
        int picY; 

        /// <summary> 
        /// 当鼠标单击时，给鼠标设定值。初始化。 
        /// </summary> 
        /// <param name="sender"> </param> 
        /// <param name="e"> </param> 
        private void pictureBox1_MouseDown(object sender, MouseEventArgs e) 
        { 
            mouseX = Cursor.Position.X; 
            mouseY = Cursor.Position.Y; 
            picX = this.pictureBox1.Left; 
            picY = this.pictureBox1.Top; 
            
            //if (isMouseMoveEventAviable == false) 
            //    //添加鼠标移动事件 
            //    this.movablePic.MouseMove += this.movablePic_MouseMove; 
        } 

        /// <summary> 
        /// 根据鼠标的移动的值，设置 
        /// </summary> 
        /// <param name="sender"> </param> 
        /// <param name="e"> </param> 
        private void pictureBox1_MouseMove(object sender, MouseEventArgs e) 
        { 
            int y = Cursor.Position.Y - mouseY + picY; 
            int x = Cursor.Position.X - mouseX + picX; 
            if (e.Button == MouseButtons.Left) 
            { 
                this.pictureBox1.Top = y; 
                this.pictureBox1.Left = x; 
            } 
        } 

    private void pictureBox1_MouseUp(object sender, MouseEventArgs e) 
        { 
            if (this.pictureBox1.Left > this.Width || (this.pictureBox1.Left + pictureBox1.Width < 0)) 
            { 
                this.pictureBox1.Left = picX; 
                this.pictureBox1.Top = picY; 
            } 
            if (this.pictureBox1.Top > this.Height || this.pictureBox1.Top + pictureBox1.Height < 0) 
            { 
                this.pictureBox1.Left = picX; 
                this.pictureBox1.Top = picY; 
            } 
            mouseX = 0; 
            mouseY = 0; 

        } 
        private void Form1_Load(object sender, EventArgs e) 
        { 
            this.pictureBox1.Cursor = Cursors.SizeAll; 
        } 
////////////////////////////////////////////////////////////////////////////////////////////

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace WindowsApplication1

{

    public partial class Form1 : Form

    {

        Point offset = new Point(0, 0);

        Point p;

        Bitmap srcBitmap;

        Panel Panel1; 

        public Form1()

        {

            InitializeComponent();

        }

        private void Panel1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)

        {

            p = e.Location;

            Panel1.Cursor = Cursors.Hand;

        }

        private void Panel1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)

        {

            if (e.Button ==  MouseButtons.Left)

            {

                offset.Offset(e.X - p.X, e.Y - p.Y);

                this.MyReDrawTest(offset.X, offset.Y);

                p = e.Location;

            }

        }

        private void Panel1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)

        {

            Panel1.Cursor = Cursors.Default;

        }

        private void Panel1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)

        {

            this.MyReDrawTest(offset.X, offset.Y);

        }

        private void MyReDrawTest(int x, int y)

        {

            if (srcBitmap == null)

                return; 

            BufferedGraphicsContext currentContext = BufferedGraphicsManager.Current;

            BufferedGraphics myBuffer = currentContext.Allocate(this.Panel1.CreateGraphics(), this.Panel1.DisplayRectangle);

            myBuffer.Graphics.Clear(this.Panel1.BackColor);

            myBuffer.Graphics.DrawImage(srcBitmap, offset);

            myBuffer.Render( this.Panel1 .CreateGraphics() );

            myBuffer.Dispose();

        }

        private void Form1_Load(object sender, System.EventArgs e)

        {

            Panel1 = new Panel();

            Panel1.Dock = DockStyle.Fill;

            Panel1.MouseDown += Panel1_MouseDown;

            Panel1.MouseMove += Panel1_MouseMove;

            Panel1.MouseUp += Panel1_MouseUp;

            Panel1.Paint += Panel1_Paint;

            this.Controls.Add(Panel1);

            OpenFileDialog cd = new OpenFileDialog();

            cd.Filter = "bmp文件 (*.bmp)|*.bmp|jpg文件 (*.jpg)|*.jpg|gif文件 (*.gif)|*.gif|所有文件|*.*";

            if (cd.ShowDialog() ==    DialogResult.OK)

            {

                srcBitmap = new Bitmap(cd.FileName);

                offset = new Point(0, 0);

                Panel1.Invalidate();

            }

        } 

    }

}