如何处理图片重叠时的鼠标事件

Question

在重写的panel中根据数据库的信息自动绘制一张结构图，结构图由n个图标和图标之间的连线组成，图标可以使用鼠标拖动，当图标被拖动后，图标之间的连线自动重新绘制，画线和画图标分别使用单独的组件类实现。
    现在的问题是：当有2张或2张以上的图片完全重合时，点击其中一个并拖动之，此时所有重合的图片一起移动？如何解决？

Answer 1

画图标的核心代码如下（除去界面代码）：
////////////////////////////////////////////////////////////////////
        //画图片的类
        /// /////////////////////////////////////////////////////////////////////
        
        public partial class TiePaint : Component, ISupportInitialize
        {            
            //初始化
            public void InitializeComponent()
            {
  
            }
            Pen pen1 = new Pen(System.Drawing.Color.White,3);
            PictureBox pb1 = new PictureBox();
            Image myimage1 = Image.FromFile(@"c:\tzsys\2.bmp");
            
            private ContextMenuStrip m_ContextMenu = new ContextMenuStrip();
            public ContextMenuStrip ContextMenu
            {
                get { return m_ContextMenu; }
                set
                {
                    m_ContextMenu = value;
                    //if (value != null)
                    //    value.Tag =this;
                }
            }
            private GraphPanel m_Parent = null;
            private Point m_OrgPoint = Point.Empty;
            public GraphPanel Parent
            {
                get { return m_Parent; }
                set { m_Parent = value; }
            }
            private bool m_Selected = false;            private bool Selected
            {
                get { return m_Selected; }
                set
                {
                    if (value != this.m_Selected)
                    {
                        m_Selected = value;
                        this.m_Parent.Invalidate();
                        this.m_Parent.Update();                    }
                }
            }
            private Point m_Point = Point.Empty;
            public Point Point1
            {
                get { return m_Point; }
                set { m_Point = value; }
            }
            public TiePaint()
            {
                InitializeComponent();
            }            public TiePaint(IContainer container)
            {
                container.Add(this);                InitializeComponent();
            }
            private void m_Parent_Paint(object sender, PaintEventArgs e)
            {
                //画点（图片）
                pb1.Image = myimage1;
                pb1.Size = myimage1.Size;
                Graphics g1 = this.Parent.CreateGraphics();
                g1.DrawImage(myimage1, (Point1.X - myimage1.Width / 2), (Point1.Y - myimage1.Height / 2));
                if (this.m_Selected)
                {
                    Pen pen = new Pen(System.Drawing.Color.White,2);
                    Graphics g = this.Parent.CreateGraphics();
                    g.DrawRectangle(pen, (Point1.X - 16), (Point1.Y - 16), 32, 32);
                    
                    //g.DrawRectangle(pen, (Point1.X - myimage1.Width / 2 - 3), (Point1.Y - myimage1.Height / 2 - 3), (myimage1.Width + 6), (myimage1.Height + 6));
                }
            }
            
            private void m_Parent_MouseDown(object sender, MouseEventArgs e)
            {
                if (CheckMouse(e.Location))
                    this.Selected = true;
                else
                    this.Selected = false;
            }
            private void m_Parent_MouseMove(object sender, MouseEventArgs e)
            {
                if (!this.Selected)
                {
                    this.m_OrgPoint = Point.Empty;
                    return;
                }
                if (this.m_OrgPoint == Point.Empty)
                {
                    this.m_OrgPoint = e.Location;
                    return;
                }
                if (e.Button == MouseButtons.Left)
                {
                   
                    if (this.Parent.ClientRectangle.Contains(e.Location))
                    {
                        this.m_Point.X += (e.Location.X - this.m_OrgPoint.X);
                        this.m_Point.Y += (e.Location.Y - this.m_OrgPoint.Y);
                        this.m_OrgPoint = e.Location;
                        this.m_Parent.Invalidate();
                        this.m_Parent.Update();
                    }
                    else
                    {
                        this.m_OrgPoint = Point.Empty;
                        this.Selected = false;
                    }
                }
            }
            private void m_Parent_ContextMenuQuery(object sender, ContextMenuQueryMenuEventArgs e)
            {
                if (this.Selected)
                {
                    if ((!e.Handle) && (this.m_ContextMenu != null))
                    {
                        this.m_ContextMenu.Show(this.m_Parent, e.MouseEventArgs.Location);
                        e.Handle = true;
                    }
                }
            }            private void m_Parent_MouseUp(object sender, MouseEventArgs e)
            {
                //this.Selected = false;
                this.m_OrgPoint = Point.Empty;
                int a = 0;
                int b = 0;
                a = this.Point1.X;
                b = this.Point1.Y;
                //MessageBox.Show("a={0}\n b={1} ", a, b);
            }
            private bool CheckMouse(Point mPos)
            {                double a = Point1.X - pb1.Width / 2;
                double b = Point1.X + pb1.Width / 2;
                double c = Point1.Y - pb1.Height / 2;
                double d = Point1.Y + pb1.Height / 2;
                if (mPos.X < a || mPos.X > b || mPos.Y < c || mPos.Y > d)
                    return false;
                else
                    return true;
            }
            public void BeginInit()
            {            }            public void EndInit()
            {
                if (this.DesignMode)
                    return;
                if (this.m_Parent == null)
                    throw new Exception("没有设置承载连线的面板");
                this.m_Parent.Paint += new PaintEventHandler(m_Parent_Paint);
                this.m_Parent.MouseDown += new MouseEventHandler(m_Parent_MouseDown);
                this.m_Parent.MouseUp += new MouseEventHandler(m_Parent_MouseUp);
                this.m_Parent.MouseMove += new MouseEventHandler(m_Parent_MouseMove);
                this.m_Parent.ContextMenuQuery1 += new ContextMenuQueryEventHandler(m_Parent_ContextMenuQuery);            }
        }

Answer 2

（同时在此感谢jointan无私的大力支持）
重载的panel
//////////////////////////////////////////////////////////////////////////
        //重载的Panel
        /// <summary>
        /// //////////////////////////////////////////////////////////////////
        /// </summary>
        public class GraphPanel : Panel
        {
            private ContextMenuStrip m_ContextMenuStrip=new ContextMenuStrip();            public ContextMenuStrip ContextMenuStrip1
            {
                get { return m_ContextMenuStrip; }
                set { m_ContextMenuStrip = value; }
            }
            
            public event ContextMenuQueryEventHandler ContextMenuQuery1;
            protected virtual void OnContextMenuQuery(MouseEventArgs e)
            {
                try
                {
                    ContextMenuQueryMenuEventArgs args = new ContextMenuQueryMenuEventArgs(e);
                    if (this.ContextMenuQuery1 != null)
                    {
                        this.ContextMenuQuery1(this, args);
                    }
                    if (args.Handle == false)
                    {
                        if (this.m_ContextMenuStrip != null)
                        this.m_ContextMenuStrip.Show(this, e.Location);
                    }
                }
                catch (Exception e1)
                {
                    MessageBox.Show(e1.ToString());
                }
            }
            protected override void OnMouseDown(MouseEventArgs e)
            {                this.Invalidate();
                this.Update(); 
                base.OnMouseDown(e);
                if (e.Button == MouseButtons.Right)
                {
                    
                    this.OnContextMenuQuery(e);
                   
                }
            }
            
        }        public delegate void ContextMenuQueryEventHandler(object obj, ContextMenuQueryMenuEventArgs e);
        public class ContextMenuQueryMenuEventArgs : EventArgs
        {
            private MouseEventArgs m_MouseEventArgs;
            private bool m_Handle = false;
            public MouseEventArgs MouseEventArgs
            {
                get { return m_MouseEventArgs; }            }
            public bool Handle
            {
                get { return this.m_Handle; }
                set { this.m_Handle = value; }
            }            public ContextMenuQueryMenuEventArgs(MouseEventArgs e)
            {
                this.m_MouseEventArgs = e;
                
            }
        }        private void Form1_Paint(object sender, PaintEventArgs e)
        {        }
        private void button1_Click(object sender, EventArgs e)
        {
            
            TiePaint paint1 = new TiePaint(this.components);
            ((System.ComponentModel.ISupportInitialize)(paint1)).BeginInit();
            paint1.Parent = graphpanel1;
            paint1.Point1 = new Point(100, 200);
            paint1.ContextMenu.Items.Add("图片1的上下文菜单");
            paint1.Parent.Invalidate();
            ((System.ComponentModel.ISupportInitialize)(paint1)).EndInit();
  
        }       
    }

Answer 3

如上面的代码所示：
    点击button1即可可以使用组件类TiePaint在重载的panel里绘制一个或者多个图标，此时的问题是：当绘制的多个图标的大小、形状、位置完全相同是，使用鼠标拖动其中一个图标，其它的图标一起移动，无论如何也分不开。
    

Answer 4

说真的这么看比较头痛。如果需要。你做个简单的例子，发我邮箱，帮你看看。[email protected]

Answer 5

private void m_Parent_MouseMove(object sender, MouseEventArgs e)
            {
                if (!this.Selected)
                {
                    this.m_OrgPoint = Point.Empty;
                    return;
                }
                if (this.m_OrgPoint == Point.Empty)
                {
                    this.m_OrgPoint = e.Location;
                    return;
                }
                if (e.Button == MouseButtons.Left)
                {
                   
                    if (this.Parent.ClientRectangle.Contains(e.Location))
                    {
                        this.m_Point.X += (e.Location.X - this.m_OrgPoint.X);
                        this.m_Point.Y += (e.Location.Y - this.m_OrgPoint.Y);
                        this.m_OrgPoint = e.Location;
                        this.m_Parent.Invalidate();
                        this.m_Parent.Update();
                    }
                    else
                    {
                        this.m_OrgPoint = Point.Empty;
                        this.Selected = false;
                    }
                }这个函数有问题吧。你的mousemove事件里获取对象的时候让对象跟sender关联。这样就唯一确定了，点哪个就动哪个。
sender用法：
((TiePaint)sender).Left

Answer 6

至whChina:
    1、不好意思，程序有点乱，让您费心了；
    2、关键问题如下：
        在TiePaint类中判断鼠标的位置，如果鼠标位于图标表是的矩形区域内时，当鼠标按下左键时，就使本图标处于被选中状态（使用状态变量m_Selected)private bool CheckMouse(Point mPos)//检查鼠标位置的函数，pb1为所绘制的图标，Point1是
                                   //图标的中心点
            {
                double a = Point1.X - pb1.Width / 2;
                double b = Point1.X + pb1.Width / 2;
                double c = Point1.Y - pb1.Height / 2;
                double d = Point1.Y + pb1.Height / 2;                //如果不再区域内返回false，在区域内返回true
                if (mPos.X < a || mPos.X > b || mPos.Y < c || mPos.Y > d)//如不再区
                    return false;
                else
                    return true;
            }    如果鼠标处于图标矩形范围内，那么就可以触发图标的MouseUp、MouseMove、MouseDown事件移动图标，但现在的问题是，如果多个（3个以上）图标的形状、大小、中心点位置全一样时，也就是几个图标完全重合，那么此时在重合区域点击鼠标试图移动图标时，所用重合的图标一起移动，就好像只存在一个图标。郁闷ing.........................

Answer 7

to:wuyazhe,让您见笑了，我没正经学过编程，可能是看了一些书，照书抄了一下罢了。
程序已经收到，马上去试一试。

Answer 8

问题已经解决，感谢wuyazhe的慷慨赐教：）