Create dyamically re-sizable line\shape winforms - vb.net

Question

I am new to programming. Can anybody help me with creating line/shape in picturebox with grips on the line/shape. Like we do it in CAD softwares.
And i want to know how to create a line on mouse click until another mouse click event occurs.
Public Class Form1
Dim isDrag As Boolean = False
Dim theRectangle As New Rectangle(New Point(0, 0), New Size(0, 0))
Dim startPoint As Point
Dim IsDimension As Boolean = False
Dim LineLocationStPoint As Point = Nothing
Dim LineLocationEndPoint As Point = Nothing
Dim cnt As Integer = 0
Dim LineArray As New ArrayList
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim fd As OpenFileDialog = New OpenFileDialog()
Dim strFileName As String
fd.Title = "Open File Dialog"
fd.Filter = "(*.PDF;*.DWG;*.TIFF;*.TIF)|*.PDF;*.DWG;*.TIFF;*.TIF|All files (*.*)|*.*"
fd.FilterIndex = 2
fd.RestoreDirectory = True
If fd.ShowDialog() = DialogResult.OK Then
strFileName = fd.FileName
'ShowFileInWebBrowser(WebBrowser1, strFileName)
PictureBox1.Load(strFileName)
End If
End Sub
Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As _
System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown
If (e.Button = MouseButtons.Right) Then
isDrag = True
End If
Dim control As Control = CType(sender, Control)
startPoint = control.PointToScreen(New Point(e.X, e.Y))
If (e.Button = MouseButtons.Left) Then
IsDimension = True
LineLocationStPoint = e.Location
LineArray.Add(e.Location)
End If
End Sub
Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As _
System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseMove
If (isDrag) Then
ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, _
FrameStyle.Dashed)
Dim endPoint As Point = CType(sender, Control).PointToScreen(New Point(e.X, e.Y))
Dim width As Integer = endPoint.X - startPoint.X
Dim height As Integer = endPoint.Y - startPoint.Y
theRectangle = New Rectangle(startPoint.X, startPoint.Y, _
width, height)
ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, _
FrameStyle.Dashed)
End If
If IsDimension Then
LineLocationEndPoint = e.Location
Dim g As Graphics = PictureBox1.CreateGraphics()
g.DrawLine(Pens.Red, LineLocationStPoint, e.Location)
g.Dispose()
End If
End Sub
Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As _
System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseUp
If IsDimension Then
PictureBox1.Refresh()
ElseIf isDrag Then
' If the MouseUp event occurs, the user is not dragging.
isDrag = False
' Draw the rectangle to be evaluated. Set a dashed frame style
' using the FrameStyle enumeration.
ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, _
FrameStyle.Dashed)
' Find out which controls intersect the rectangle and change their color.
' The method uses the RectangleToScreen method to convert the
' Control's client coordinates to screen coordinates.
Dim i As Integer
Dim controlRectangle As Rectangle
For i = 0 To Controls.Count - 1
controlRectangle = Controls(i).RectangleToScreen _
(Controls(i).ClientRectangle)
If controlRectangle.IntersectsWith(theRectangle) Then
Controls(i).BackColor = Color.BurlyWood
End If
Next
' Reset the rectangle.
theRectangle = New Rectangle(0, 0, 0, 0)
End If
End Sub
But it creates the line continuously from selected point. Whereas I want to create a line only for showing user the path of line. And i have implemented selection rectangle an right click button
Procedure for working:
Toolbar will contain line and Area
Open a file(image file)
click on line button of toolbar
*Come to picturebox
*click on one point of screen
*dynamic line starts drawing on screen (line will be from the 1st clicked point to where ever mouse mouse)
*when user clicks the next time the line is created.
click area of toolbar
*come back to picturebox
*operation same like line but when user clicks third point on picture box a shaded rectangle should appear.

Answer 1

http://www.vb-helper.com/howto_2005_line_control.html
For those who want to implement line with resizing grip in it.
For adding re sizable line you need to add a customized control of your own. Use this custom control and add/use it in form for further use.
Thanks everyone for helping