HELP: soucis avec zoom picturebox, panel et scrollbar

Bonjour a tout le forum,

J'ai un gros soucis avec la gestion d'un zoom dans mon appli... 5 jours que j'y suis et je m'en sorts pas.

Voila, j'ai:
- un panel (pb) avec autoscroll=false
- une picturebox (piccontainer)
- une scrollbar vertical (VScrollBar1)
- une scrollbar horizontal (HScrollBar1)
- un bouton de zoom + (cmdaction2)
- un bouton de zoom - (cmdaction3)

Le systeme de zoom centré sur la picturebox marche tres bien.
Les scrollbar apparaissent si les dimensions de celle-ci sont supérieures à celle du panel (logique me direz vous)
Voici le code:

Code:

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Option Explicit On
Imports System.Drawing.Printing
Public Class Form1

    Public sngZPLZoom As Double

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        picZPLView.Image = Nothing
        sngZPLZoom = 6
        picZPLView.Width = (Convert.ToDouble(txtetiquette0.Text) * sngZPLZoom) + &H2
        picZPLView.Height = (Convert.ToDouble(txtetiquette1.Text) * sngZPLZoom) + &H6
        Call Form_Resize()
       
    End Sub

    Private Sub Form_Resize()
        Dim lngI As Long
        Dim lngJ As Long
        Dim sngI As Single
        Dim x, y, x1, y1, x2, y2 As Single

        If Me.WindowState <> 1 Then
            piccontainer.Width = piczplview.Width + (piczplview.Width / 3.5)
            piccontainer.Height = piczplview.Height + (piczplview.Height / 3.5)

            If piccontainer.Width < pb.Width Then
                HScrollBar1.Visible = False
            Else
                HScrollBar1.Visible = True
                HScrollBar1.Minimum = pb.Width - piccontainer.Width
                HScrollBar1.Maximum = pb.Width
                HScrollBar1.LargeChange = 10
                HScrollBar1.SmallChange = 1
                HScrollBar1.Value = (HScrollBar1.Maximum + HScrollBar1.Minimum) / 2
            End If

            If piccontainer.Height < pb.Height Then
                VScrollBar1.Visible = False
            Else
                VScrollBar1.Visible = True
                VScrollBar1.Minimum = 0
                VScrollBar1.Maximum = pb.Height- piccontainer.height
                VScrollBar1.LargeChange = 10
                VScrollBar1.SmallChange = 1
                VScrollBar1.Value = (VScrollBar1.Maximum + VScrollBar1.Minimum) / 2
            End If

            piccontainer.Left = (pb.Width - piccontainer.Width) / 2
            piccontainer.Top = (pb.Height - piccontainer.Height) / 2
            piczplview.Left = (pb.Width - piczplview.Width) / 2
            piczplview.Top = (pb.Height - piczplview.Height) / 2


            Dim fond As Bitmap = New Bitmap(picContainer.Width, picContainer.Height)
            piccontainer.Image = fond
            Dim taille As Single
            taille = (10 * sngZPLZoom) / 5
            Dim ft As Font = New Font("arial", taille, FontStyle.Bold)
            Dim g As Graphics = Graphics.FromImage(picContainer.Image)
            piccontainer.Image = Nothing
            lngI = 0
            For sngI = ((picZPLView.Width) / txtetiquette0.Text) To picZPLView.Width - 1 Step ((picZPLView.Width) / txtetiquette0.Text)
                lngI = lngI + 1
                If lngI < 10 Then
                    If lngI <> 5 Then
                        x1 = piczplview.Left + sngI - piccontainer.Left
                        y1 = piczplview.Top - 4 - piccontainer.Top
                        x2 = piczplview.Left + sngI - piccontainer.Left
                        y2 = piczplview.Top - piccontainer.Top
                        g.DrawLine(Pens.Blue, x1, y1, x2, y2)
                        x1 = piczplview.Left + sngI - piccontainer.Left
                        y1 = piczplview.Top + piczplview.Height - piccontainer.Top
                        x2 = piczplview.Left + sngI - piccontainer.Left
                        y2 = (piczplview.Top + piczplview.Height) + 4 - piccontainer.Top
                        g.DrawLine(Pens.Blue, x1, y1, x2, y2)
                    Else
                        x1 = piczplview.Left + sngI - piccontainer.Left
                        y1 = piczplview.Top - 8 - piccontainer.Top
                        x2 = piczplview.Left + sngI - piccontainer.Left
                        y2 = piczplview.Top - piccontainer.Top
                        g.DrawLine(Pens.Blue, x1, y1, x2, y2)
                        x1 = piczplview.Left + sngI - piccontainer.Left
                        y1 = piczplview.Top + piczplview.Height - piccontainer.Top
                        x2 = piczplview.Left + sngI - piccontainer.Left
                        y2 = (piczplview.Top + piczplview.Height) + 8 - piccontainer.Top
                        g.DrawLine(Pens.Blue, x1, y1, x2, y2)
                    End If
                Else
                    lngI = 0
                    lngJ = lngJ + 10
                    x1 = piczplview.Left + sngI - piccontainer.Left
                    y1 = (piczplview.Top - piccontainer.Top) - (sngZPLZoom * 3)
                    x2 = piczplview.Left + sngI - piccontainer.Left
                    y2 = (piczplview.Top - piccontainer.Top)
                    g.DrawLine(Pens.Blue, x1, y1, x2, y2)
                    x1 = piczplview.Left + sngI - piccontainer.Left
                    y1 = piczplview.Top + piczplview.Height - piccontainer.Top
                    x2 = piczplview.Left + sngI - piccontainer.Left
                    y2 = ((piczplview.Top + piczplview.Height) - piccontainer.Top) + (sngZPLZoom * 3)
                    g.DrawLine(Pens.Blue, x1, y1, x2, y2)
                    x = ((piczplview.Left + sngI) - ((g.MeasureString(lngJ, ft).Width) / 2)) - piccontainer.Left
                    y = (piczplview.Top - piccontainer.Top) - (sngZPLZoom * 6)
                    g.DrawString(lngJ, ft, New SolidBrush(Color.White), x, y)
                    x = ((piczplview.Left + sngI) - ((g.MeasureString(lngJ, ft).Width) / 2)) - piccontainer.Left
                    y = (piczplview.Top + piczplview.Height - piccontainer.Top) + (sngZPLZoom * 3)
                    g.DrawString(lngJ, ft, New SolidBrush(Color.White), x, y)
                End If
            Next sngI
            lngI = 0
            lngJ = 0
            For sngI = ((picZPLView.Height) / txtetiquette1.Text) To picZPLView.Height - &H1 Step ((picZPLView.Height) / txtetiquette1.Text)
                lngI = lngI + 1
                If lngI < 10 Then
                    If lngI <> 5 Then
                        x1 = piczplview.Left - 4 - piccontainer.Left
                        y1 = piczplview.Top + sngI - piccontainer.Top
                        x2 = piczplview.Left - piccontainer.Left
                        y2 = piczplview.Top + sngI - piccontainer.Top
                        g.DrawLine(Pens.Blue, x1, y1, x2, y2)
                        x1 = piczplview.Left + piczplview.Width - piccontainer.Left
                        y1 = piczplview.Top + sngI - piccontainer.Top
                        x2 = (piczplview.Left + piczplview.Width) + &H4 - piccontainer.Left
                        y2 = piczplview.Top + sngI - piccontainer.Top
                        g.DrawLine(Pens.Blue, x1, y1, x2, y2)
                    Else
                        x1 = piczplview.Left - &H8 - piccontainer.Left
                        y1 = piczplview.Top + sngI - piccontainer.Top
                        x2 = piczplview.Left - piccontainer.Left
                        y2 = piczplview.Top + sngI - piccontainer.Top
                        g.DrawLine(Pens.Blue, x1, y1, x2, y2)
                        x1 = piczplview.Left + piczplview.Width - piccontainer.Left
                        y1 = piczplview.Top + sngI - piccontainer.Top
                        x2 = (piczplview.Left + piczplview.Width) + &H8 - piccontainer.Left
                        y2 = piczplview.Top + sngI - piccontainer.Top
                        g.DrawLine(Pens.Blue, x1, y1, x2, y2)
                    End If
                Else
                    lngI = 0
                    lngJ = lngJ + 10
                    x1 = (piczplview.Left - piccontainer.Left) - (sngZPLZoom * 3)
                    y1 = piczplview.Top + sngI - piccontainer.Top
                    x2 = piczplview.Left - piccontainer.Left
                    y2 = piczplview.Top + sngI - piccontainer.Top
                    g.DrawLine(Pens.Blue, x1, y1, x2, y2)
                    x1 = piczplview.Left + piczplview.Width - piccontainer.Left
                    y1 = piczplview.Top + sngI - piccontainer.Top
                    x2 = ((piczplview.Left + piczplview.Width) - piccontainer.Left) + (sngZPLZoom * 3)
                    y2 = piczplview.Top + sngI - piccontainer.Top
                    g.DrawLine(Pens.Blue, x1, y1, x2, y2)
                    x = (piczplview.Left - piccontainer.Left) - (7 * sngZPLZoom)
                    y = ((piczplview.Top + sngI) - ((g.MeasureString(lngJ, ft).Width)) / 2.5) - piccontainer.Top
                    g.DrawString(lngJ, ft, New SolidBrush(Color.White), x, y)
                    x = ((piczplview.Left + piczplview.Width) - piccontainer.Left) + (3 * sngZPLZoom)
                    y = ((piczplview.Top + sngI) - ((g.MeasureString(lngJ, ft).Width)) / 2.5) - piccontainer.Top
                    g.DrawString(lngJ, ft, New SolidBrush(Color.White), x, y)

                End If
            Next
            picContainer.Image = fond
        End If
        Call drawZPL()
    End Sub

    Private Sub cmdAction1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdAction1.Click
        sngZPLZoom = 6.2
        picZPLView.Image = Nothing
        picZPLView.Width = (txtetiquette0.Text * sngZPLZoom) + &H2
        picZPLview.Height = (txtetiquette1.Text * sngZPLZoom) + &H6
        Call Form_Resize()

    End Sub

    Private Sub cmdAction2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdAction2.Click
        If sngZPLZoom < 10 Then
            sngZPLZoom = sngZPLZoom + 0.2
            picZPLView.Image = Nothing
            picZPLView.Width = (txtetiquette0.Text * sngZPLZoom) + &H2
            picZPLview.Height = (txtetiquette1.Text * sngZPLZoom) + &H6
            Call Form_Resize()
            
        End If
    End Sub

    Private Sub cmdAction3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdAction3.Click
        If sngZPLZoom > 2.4 Then
            sngZPLZoom = sngZPLZoom - 0.2
            picZPLView.Image = Nothing
            picZPLView.Width = (txtetiquette0.Text * sngZPLZoom) + &H2
            picZPLView.Height = (txtetiquette1.Text * sngZPLZoom) + &H6
            Call Form_Resize()
        End If
    End Sub

     Private Sub initializ()
        picZPLView.Image = Nothing
        sngZPLZoom = 6
        picZPLView.Width = (Convert.ToDouble(txtetiquette0.Text) * sngZPLZoom) + &H2
        picZPLView.Height = (Convert.ToDouble(txtetiquette1.Text) * sngZPLZoom) + &H6
        Call Form_Resize()
    End Sub
End Class

Mon soucis viens de la gestion des scrollbar... (en rouge).
En fait, je souhaite que lorsque ma picturebox est plus grande que le panel, on puisse visualiser les parties "cachées" de la picturebox en jouant sur les scrollbars... facile en theorie
Le probleme c'est que j'y arrive pas... soit ca deborde trop a gauche, a droite... soit le curseur n'est plus centré lors du zoom...
En gros je patauge ;-)

Pour deplacer les curseurs des scrollbars, j'ai le code suivant:

Code:

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Private Sub HScrollBar1_Scroll(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ScrollEventArgs) Handles HScrollBar1.Scroll
        piccontainer.Left = -HScrollBar1.Value
    End Sub
 
    Private Sub VScrollBar1_Scroll(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ScrollEventArgs) Handles VScrollBar1.Scroll
        piccontainer.Height = -VScrollBar1.Value
    End Sub

cela me donne qqchose mais pas ce que je veux, donc si une ame charitable pourrait me donner un coup de main....

a l'avance merci