鼠标 在 picturebox 上拖动图片的问题

bolv6666 2008-04-15 07:46:57
现在已经实现了鼠标在picturebox上点住然后拖动图片，但是效果不好：


private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (WhetherSelected)
{
DriftX = e.X - p.X;
DriftY = e.Y - p.Y;
mx += DriftX;
my += DriftY;

Graphics gg = pictureBox1.CreateGraphics();
gg.Clear(pictureBox1.BackColor);//这句如果不加的话，就会产生拖影
gg.DrawImage(this.pictureBox1.Image, mx, my);
p.X = e.X;
p.Y = e.Y;
gg.Dispose();
}
}

主要是通过gg.DrawImage(this.pictureBox1.Image, mx, my);来重绘图片的，虽然基本功能实现，但是由两个问题：
1：鼠标拖动时会不停的闪烁刷新，这是由于gg.Clear(pictureBox1.BackColor)，但不加这句就有拖影产生
2：用gg.DrawImage产生新图的最大问题就是 当你最小化或其他什么东西经过它上面时就被擦除了

请问各位有没有两全其美的实现方法。我个人觉得：如果能够知道怎么在picturebox中定位图片位置就好了，这样也不用gg.DrawImage了，请各位指点指点，多谢
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c1000095815 2011-11-14
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我也搞了一个。。bool wselected = false;
Point p = new Point();
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
pictureBox1.Cursor = Cursors.Hand; //按下鼠标时，将鼠标形状改为手型
wselected = true;
p.X = e.X;
p.Y = e.Y;
}
int driftX = 0, driftY = 0;
int mx = 0, my = 0;
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (wselected)
{
driftX = p.X - e.X;
driftY = p.Y - e.Y;

mx = mx - driftX;
my = my - driftY;

Bitmap JPEG = new Bitmap(this.pictureBox1.Image);

Graphics g = pictureBox1.CreateGraphics();
g.Clear(pictureBox1.BackColor);
g.DrawImage(JPEG, mx, my);

p.X = e.X;
p.Y = e.Y;

JPEG.Dispose();
g.Dispose();//图像移动的距离
}
}

private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
pictureBox1.Cursor = Cursors.Default; //松开鼠标时，形状恢复为箭头

wselected = false ;
this.pictureBox1.Cursor = Cursors.Default;
}
c1000095815 2011-11-14
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谢了~
wzuomin 2008-04-16
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我上面的那部分自动转换的C#代码好像有问题，改了一下重新贴出来了


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();

            }

        } 

    }

}
wzuomin 2008-04-16
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来一个我写的最好用的，嘿嘿



Public Class Form1



    Dim offset As New Point(0, 0)

    Dim p As Point

    Dim srcBitmap As Bitmap

    Dim WithEvents Panel1 As Panel



    Private Sub Panel1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Panel1.MouseDown

        p = e.Location

        Panel1.Cursor = Cursors.Hand

    End Sub



    Private Sub Panel1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Panel1.MouseMove

        If e.Button = Windows.Forms.MouseButtons.Left Then

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

            Call Me.MyReDrawTest(offset.X, offset.Y)

            p = e.Location

        End If

    End Sub



    Private Sub Panel1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Panel1.MouseUp

        Panel1.Cursor = Cursors.Default

    End Sub



    Private Sub Panel1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Panel1.Paint

        Call Me.MyReDrawTest(offset.X, offset.Y)

    End Sub



    Private Sub MyReDrawTest(ByVal x As Integer, ByVal y As Integer)

        If srcBitmap Is Nothing Then Exit Sub



        Dim currentContext As BufferedGraphicsContext = BufferedGraphicsManager.Current

        Dim myBuffer As BufferedGraphics = currentContext.Allocate(Me.Panel1.CreateGraphics, Me.Panel1.DisplayRectangle)



        myBuffer.Graphics.Clear(Me.Panel1.BackColor)

        myBuffer.Graphics.DrawImage(srcBitmap, offset)

        myBuffer.Render(Me.Panel1.CreateGraphics)

        myBuffer.Dispose()

    End Sub



    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Panel1 = New Panel

        Panel1.Dock = DockStyle.Fill

        Me.Controls.Add(Panel1)

        Dim cd As 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 = Windows.Forms.DialogResult.OK Then

            srcBitmap = New Bitmap(cd.FileName)

            offset = New Point(0, 0)

            Panel1.Invalidate()

        End If

    End Sub

End Class






public class Form1 

{ 

    

    Point offset = new Point(0, 0); 

    Point p; 

    Bitmap srcBitmap; 

    Panel Panel1; 

    

    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 == Windows.Forms.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; // TODO: might not be correct. Was : Exit Sub 



        

        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; 

        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 == Windows.Forms.DialogResult.OK) { 

            srcBitmap = new Bitmap(cd.FileName); 

            offset = new Point(0, 0); 

            Panel1.Invalidate(); 

        } 

    } 

}
cxfcxf8 2008-04-16
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http://www.codeproject.com/KB/GDI-plus/Gradiator.aspx
来个功能强大的。
fly_to_sky 2008-04-16
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<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;
}
ojekleen 2008-04-16
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标记
光义 2008-04-16
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/// <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)

        {

            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;

        }
光义 2008-04-16
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试试
bolv6666 2008-04-16
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还是不行，基本效果都显示不了了，哪里出了问题？
春天的气息 2008-04-15
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顶！
另外用java script效果也不错的！
jinjazz 2008-04-15
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改良了一下
http://blog.csdn.net/jinjazz/archive/2008/04/15/2295229.aspx
jinjazz 2008-04-15
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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Data.SqlClient;

namespace WindowsApplication2

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();



        }



        bool bPictureBoxDragging = false;

        Point oPointClicked;



        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)

        {

            

                bPictureBoxDragging = true;

                oPointClicked = new Point(e.X, e.Y);

             



        }



        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)

        {

            if (bPictureBoxDragging)

            {

                Point oMoveToPoint;

                oMoveToPoint = this.PointToClient(pictureBox1.PointToScreen(new Point(e.X, e.Y)));

                oMoveToPoint.Offset(oPointClicked.X * -1, oPointClicked.Y * -1);

                pictureBox1.Location = oMoveToPoint;

            }



        }



        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)

        {

            bPictureBoxDragging = false;

        }

    }

}
dancingbit 2008-04-15
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把重绘代码放在Paint事件处理方法中，需要重绘的时候自然就会重绘，比如最小化后还原，比如被遮挡住后再次显示...
如果需要控制手动的更新，来一个Invalidate()就是了，这样，还不需要Clear。
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