node diagram

[pavlaras]

hi all
its been a while since i've worked on a VB program and im currently facing difficulties with the following code.I'm trying to create a diagram with nodes which you can manipulate and enter data.So far the program creates the nodes with numbered text by dragging the node and moves them by right click them.I want to be able to go back and delete any node i want plus to be able to access the nodes(enter text,extra form with info that the user will give)
If you can provide pointers or links to example code or literature, it
would be appreciated.

image control-index property 0

' [ Class1 ] ------------------------------------------------
Option Explicit

Public X As Long
Public Y As Long
Public Text As String
Public Handle As Image

Again Thanks
Public Kids As New Collection


Friend Sub RenderLines(Surface As Variant)
Dim Item As Class1
'Connect lines first, then do circles/text
For Each Item In Kids
Surface.Line (X, Y)-(Item.X, Item.Y), vbBlack
Item.RenderLines Surface
Next
End Sub

Friend Sub RenderText(Surface As Variant)
Dim Item As Class1
' draw the circles and text
Surface.Circle (X, Y), 500, vbBlack
Surface.CurrentX = X - Surface.TextWidth(Text) \ 2
Surface.CurrentY = Y - Surface.TextHeight(Text) \ 2
Surface.Print Text;

For Each Item In Kids
Item.RenderText Surface
Next
Handle.Move X - 500, Y - 500, 1000, 1000
End Sub

Public Function Locate(ByVal Index As Long) As Class1
Dim kid As Class1
Dim test As Class1
' reutrns the class whose handle has a certain Index
If Handle.Index = Index Then
Set Locate = Me
Else
For Each kid In Kids
Set test = kid.Locate(Index)
If Not test Is Nothing Then
Set Locate = test
Exit For
End If
Next
End If
End Function




' [ Form1 ] -------------------------------------------------------
Option Explicit
Private Node As Class1
Private Drawing As Boolean
Private StartX As Long, StartY As Long
Private OldX As Long, OldY As Long
Private StartNode As Class1


Private Sub Form_DragDrop(Source As Control, X As Single, Y As Single)
DropIt Source, X, Y
End Sub

Private Sub Form_Load()
Me.FillStyle = vbFSSolid
Me.FillColor = vbWhite
Me.DrawWidth = 2
Set Node = NewItem(ScaleWidth \ 2, ScaleHeight \ 2, "Root", Image1(0))
End Sub

Private Sub Form_Paint()
Node.RenderLines Me
Node.RenderText Me
End Sub

Private Sub Image1_DragDrop(Index As Integer, Source As Control, X As Single, Y As Single)
Dim img As Image
Set img = Node.Locate(Index).Handle
DropIt Source, img.Left + X, img.Top + Y
End Sub

Private Sub Image1_MouseDown(Index As Integer, Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = vbLeftButton Then
'Select Draw Mode
Drawing = True
DrawMode = vbInvert
DrawStyle = vbDot
'Store start values
Set StartNode = Node.Locate(Index)
StartX = StartNode.X
StartY = StartNode.Y
OldX = X + StartNode.Handle.Left
OldY = Y + StartNode.Handle.Top
Else
OldX = X
OldY = Y
Node.Locate(Index).Handle.Drag vbBeginDrag
End If
End Sub

Private Sub Image1_MouseMove(Index As Integer, Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim XX As Long, YY As Long
If Drawing Then
' Convert Image click to Form coordinates
XX = X + StartNode.Handle.Left
YY = Y + StartNode.Handle.Top
'Erase old line
Line (StartX, StartY)-(OldX, OldY), vbBlack
'Draw new line
Line (StartX, StartY)-(XX, YY), vbBlack
OldX = XX
OldY = YY
End If
End Sub

Private Sub Image1_MouseUp(Index As Integer, Button As Integer, Shift As Integer, X As Single, Y As Single)
If Drawing Then
Drawing = False
DrawMode = vbCopyPen
DrawStyle = vbSolid
' Create a new Image control, make it visible
Load Image1(Image1.Count)
Image1(Image1.Count - 1).Visible = True
' Add a new item to the node
Node.Locate(Index).Kids.Add NewItem(X + StartNode.Handle.Left, _
Y + StartNode.Handle.Top, CStr(Image1.Count - 1), _
Image1(Image1.Count - 1))
Refresh
End If
End Sub

Private Function NewItem(ByVal X As Long, ByVal Y As Long, Text As String, Handle As Image) As Class1
Set NewItem = New Class1
With NewItem
.X = X
.Y = Y
.Text = Text
Set .Handle = Handle
End With
End Function

Private Sub DropIt(Source As Image, ByVal X As Long, ByVal Y As Long)
Dim This As Class1
' Drops item
Set This = Node.Locate(Source.Index)
This.X = X - (OldX - 500)
This.Y = Y - (OldY - 500)
Source.Drag vbEndDrag
Refresh
End Sub