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copied!<p>Here is a sample code you can use for your need. It basically uses 4 events :<br/> - Paint<br/> - MouseDown<br/> - MouseMove<br/> - MouseUp<br/></p> <p>You can copy-paste this code to a form called Form1, with a picture box called pictureBox1 </p> <p><code></p> <pre><code> int handleRadius = 3; int mPointMoveInProgress = 0; Point mPoint1, mPoint2; public Form1() { InitializeComponent(); mPoint1 = new Point(50, 50); // Set correct default values mPoint1 = new Point(50, 300); // Set correct default values } private void pictureBox1_Paint(object sender, PaintEventArgs e) { // Draw line e.Graphics.DrawLine(new Pen(Color.Black, 2), mPoint1, mPoint2); Rectangle rectangle; // Draw first handle rectangle = new Rectangle(mPoint1.X - handleRadius, mPoint1.Y - handleRadius, handleRadius * 2, handleRadius * 2); e.Graphics.FillRectangle(Brushes.White, rectangle); e.Graphics.DrawRectangle(Pens.Black, rectangle); // Draw second handle rectangle = new Rectangle(mPoint2.X - handleRadius, mPoint2.Y - handleRadius, handleRadius * 2, handleRadius * 2); e.Graphics.FillRectangle(Brushes.White, rectangle); e.Graphics.DrawRectangle(Pens.Black, rectangle); } private void pictureBox1_MouseDown(object sender, MouseEventArgs e) { // Determine if a point is under the cursor. If so, declare that a move is in progress if (Math.Abs(e.X - mPoint1.X) < handleRadius && Math.Abs(e.Y - mPoint1.Y) < handleRadius) mPointMoveInProgress = 1; else if (Math.Abs(e.X - mPoint2.X) < handleRadius && Math.Abs(e.Y - mPoint2.Y) < handleRadius) mPointMoveInProgress = 2; else mPointMoveInProgress = 0; } private void pictureBox1_MouseMove(object sender, MouseEventArgs e) { if (mPointMoveInProgress == 1) // If moving first point { mPoint1.X = e.X ; mPoint1.Y = e.Y ; Refresh(); } else if (mPointMoveInProgress == 2) // If moving second point { mPoint2.X = e.X ; mPoint2.Y = e.Y ; Refresh(); } else // If moving in the PictureBox: change cursor to hand if above a handle { if (Math.Abs(e.X - mPoint1.X) < handleRadius && Math.Abs(e.Y - mPoint1.Y) < handleRadius) Cursor.Current = Cursors.Hand; else if (Math.Abs(e.X - mPoint2.X) < handleRadius && Math.Abs(e.Y - mPoint2.Y) < handleRadius) Cursor.Current = Cursors.Hand; else Cursor.Current = Cursors.Default; } } private void pictureBox1_MouseUp(object sender, MouseEventArgs e) { // Declare that no move is in progress mPointMoveInProgress = 0; } </code></pre> <p></code></p>

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