Imports System.Runtime.InteropServices
Imports System.Text
Imports System.Math
Imports System.IO
Imports TestEIn.EgtInterface
Imports TestEIn.GenInterface


Public Class Form1

   Private m_sIniFile As String = String.Empty
   Private m_sCurrFile As String = String.Empty
   Private m_bModified As Boolean = False
   Private m_nMarkObj As Integer = GDB_ID_NULL

'-------------------------------- Form ------------------------------------------------------------
   Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
      'Title
      EmitTitle()
      'Impostazione path Ini file
      m_sIniFile = Application.StartupPath & "\TestEIn.ini"
      'Inizializzazione generale di EgtInterface
      EgtInit(0, Application.StartupPath & "\TestEngine.log")
      'imposto chiave di protezione
      Dim sKey As String = String.Empty
      GetPrivateProfileString("General", "Key", "", sKey, m_sIniFile)
      EgtSetKey(sKey)
      'imposto dir font Nfe e font default
      Dim sNfeDir As String = String.Empty
      GetPrivateProfileString("GeomDB", "NfeFontDir", "", sNfeDir, m_sIniFile)
      Dim sDefFont As String = String.Empty
      GetPrivateProfileString("GeomDB", "DefaultFont", "", sDefFont, m_sIniFile)
      EgtSetFont(sNfeDir, sDefFont)
      ' imposto colore di default
      Dim DefColor As New Color(0, 0, 0)
      GetPrivateProfileColor("GeomDB", "DefaultColor", DefColor, m_sIniFile)
      Scene1.SetDefaultMaterial(DefColor)
      ' imposto colori sfondo
      Dim BackTopColor As New Color(192, 192, 192)
      GetPrivateProfileColor("Scene", "BackTop", BackTopColor, m_sIniFile)
      Dim BackBotColor As New Color(192, 192, 192)
      GetPrivateProfileColor("Scene", "BackBottom", BackBotColor, m_sIniFile)
      Scene1.SetViewBackground(BackTopColor, BackBotColor)
      ' imposto colore di evidenziazione
      Dim MarkColor As New Color(255, 255, 0)
      GetPrivateProfileColor("Scene", "Mark", MarkColor, m_sIniFile)
      Scene1.SetMarkMaterial(MarkColor)
      ' imposto tipo e colore del rettangolo di zoom
      Dim bOutline As Boolean = True
      Dim ZwColor As Color
      ZwColor.Setup(0, 0, 0)
      GetPrivateProfileZoomWin("Scene", "ZoomWin", bOutline, ZwColor, m_sIniFile)
      Scene1.SetZoomWinAttribs(bOutline, ZwColor)
      ' imposto colore della linea di distanza
      Dim DstLnColor As Color
      DstLnColor.Setup(255, 0, 0)
      GetPrivateProfileColor("Scene", "DistLine", DstLnColor, m_sIniFile)
      Scene1.SetDistLineMaterial(DstLnColor)
      ' imposto parametri OpenGL
      Dim nDriver As Integer = GetPrivateProfileInt("OpenGL", "Driver", 3, m_sIniFile)
      Dim b2Buff As Boolean = (GetPrivateProfileInt("OpenGL", "DoubleBuffer", 1, m_sIniFile) <> 0)
      Dim nColorBits As Integer = GetPrivateProfileInt("OpenGL", "ColorBits", 32, m_sIniFile)
      Dim nDepthBits As Integer = GetPrivateProfileInt("OpenGL", "DepthBits", 32, m_sIniFile)
      Scene1.SetViewAttributes(nDriver, b2Buff, nColorBits, nDepthBits)
      ' inizializzo scena
      Scene1.Init()
      ' modo di visualizzazione
      Dim nShowMode As Integer = GetPrivateProfileInt("Scene", "ShowMode", SM_SHADING, m_sIniFile)
      If nShowMode = SM_WIREFRAME Then
         rbtWireFrame.Checked = True
      ElseIf nShowMode = SM_HIDDENLINE Then
         rbtHiddenLine.Checked = True
      Else
         rbtShading.Checked = True
      End If
      ' visualizzazione direzione curve
      Dim nShowCurveDir As Integer = GetPrivateProfileInt("Scene", "CurveDir", 0, m_sIniFile)
      chkCurveDir.Checked = (nShowCurveDir <> 0)
      ' ObjTree non selezionato
      m_nOldIdTree = GDB_ID_NULL
      ' aggiungo voce per about box nel menù di sistema
      Dim hSysMenu As IntPtr = GetSystemMenu(Handle, False)
      If hSysMenu <> IntPtr.Zero Then
         AppendMenu(hSysMenu, MF_SEPARATOR, 0, "")
         AppendMenu(hSysMenu, MF_STRING, IDM_ABOUTBOX, "About TestEIn...")
      End If
      'Posizione e dimensioni del Form
      If ModifierKeys <> Keys.Shift Then
         Dim nFlag As Integer
         Dim nLeft As Integer
         Dim nTop As Integer
         Dim nWidth As Integer
         Dim nHeight As Integer
         GetPrivateProfileWinPos("General", "WinPlace", nFlag, nLeft, nTop, nWidth, nHeight, m_sIniFile)
         Me.StartPosition = System.Windows.Forms.FormStartPosition.Manual
         Me.Location = New Point(nLeft, nTop)
         Me.Size = New Size(nWidth, nHeight)
         WindowState = IIf(nFlag = 1, FormWindowState.Maximized, FormWindowState.Normal)
      End If
      ' Recupero eventuali parametri da linea di comando
      For Each s As String In My.Application.CommandLineArgs
         If Not String.IsNullOrWhiteSpace(s) Then
            Dim nFileType As Integer = EgtGetFileType(s)
            Select Case nFileType
            Case FT_NGE, FT_NFE
               Scene1.OpenProject(s, False)
            Case FT_DXF, FT_STL, FT_CNC
               Scene1.ImportProject(s, False)
            Case FT_TSC, FT_LUA
               Scene1.Exec(s, False)
            End Select
            Exit For
         End If
      Next
   End Sub

   Private Sub Form1_FormClosing(sender As System.Object, e As FormClosingEventArgs) Handles MyBase.FormClosing
      ' gestisco eventuale file corrente modificato
      If Not ManageModified() Then
         e.Cancel = True
         Return
      End If
      ' Salvo modo di visualizzazione
      WritePrivateProfileString("Scene", "ShowMode", EgtGetShowMode(), m_sIniFile)
      ' Salvo stato visualizzazione direzione curve
      WritePrivateProfileString("Scene", "CurveDir", IIf(EgtGetShowCurveDirection(), 1, 0), m_sIniFile)
      ' Salvo posizione Form
      Dim nFlag As Integer = IIf(Me.WindowState = FormWindowState.Maximized, 1, 0)
      WritePrivateProfileWinPos("General", "WinPlace", nFlag, Me.Left, Me.Top, Me.Width, Me.Height, m_sIniFile)
      ' Terminazione generale di EgtInterface
      EgtExit()
   End Sub

   Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
      MyBase.WndProc(m)
      If m.Msg = WM_SYSCOMMAND Then
         If m.WParam.ToInt32 = IDM_ABOUTBOX Then
            AboutBox1.ShowDialog()
         End If
      End If
   End Sub

 '-------------------------------- Events management ----------------------------------------------
   Private Sub OnCursorPos(ByVal sender As Object, ByVal sCursorPos As String) Handles Scene1.OnCursorPos
      ToolStripStatusCursorPos.Text = sCursorPos
   End Sub

   Private Sub OnMouseSelected(ByVal sender As Object, ByVal nId As Integer) Handles Scene1.OnMouseSelected
      If EgtIsSelectedObj(nId) Then
         EgtDeselectObj(nId)
      Else
         EgtSelectObj(nId)
      End If
      EgtDraw()
   End Sub

   Private Sub OnMouseAnalyzed(ByVal sender As Object, ByVal nId As Integer) Handles Scene1.OnMouseAnalyzed
      SelectIdInObjTree(nId)
   End Sub

   Private Sub OnShowDistance(ByVal sender As Object, ByVal sDistance As String) Handles Scene1.OnShowDistance
      ToolStripStatusOutput.Text = sDistance
   End Sub

   Private Sub OnNewProject(ByVal sender As Object) Handles Scene1.OnNewProject
      m_sCurrFile = String.Empty
      m_bModified = False
      EmitTitle()
      ClearObjTree()
   End Sub

   Private Sub OnOpeningProject(ByVal sender As Object) Handles Scene1.OnOpeningProject
      ClearObjTree()
   End Sub

   Private Sub OnOpenProject(ByVal sender As Object, ByVal sFile As String) Handles Scene1.OnOpenProject
      m_sCurrFile = sFile
      m_bModified = False
      EmitTitle()
      WritePrivateProfileString("General", "LastNgeDir", Path.GetDirectoryName(m_sCurrFile), m_sIniFile)
      LoadObjTree()
   End Sub

   Private Sub OnSavingProject(ByVal sender As Object, ByVal sFile As String) Handles Scene1.OnSavingProject
      m_sCurrFile = sFile
      EmitTitle()
      WritePrivateProfileString("General", "LastNgeDir", Path.GetDirectoryName(m_sCurrFile), m_sIniFile)
      ' ripristino stato eventuale oggetto marcato
      m_nMarkObj = RevertOldIdInObjTree()
   End Sub

   Private Sub OnSavedProject(ByVal sender As Object) Handles Scene1.OnSavedProject
      m_bModified = False
      ' rimarco eventuale oggetto smarcato
      SelectIdInObjTree(m_nMarkObj)
   End Sub

   Private Sub OnImportingProject(ByVal sender As Object) Handles Scene1.OnImportingProject
      ClearObjTree()
   End Sub

   Private Sub OnImportedProject(ByVal sender As Object, ByVal sFile As String) Handles Scene1.OnImportedProject
      WritePrivateProfileString("General", "LastImpDir", Path.GetDirectoryName(sFile), m_sIniFile)
      m_sCurrFile = sFile
      m_bModified = True
      EmitTitle()
      LoadObjTree()
   End Sub

   Private Sub OnExportingProject(ByVal sender As Object, ByVal sFile As String) Handles Scene1.OnExportingProject
      WritePrivateProfileString("General", "LastExpDir", Path.GetDirectoryName(sFile), m_sIniFile)
      ' ripristino stato eventuale oggetto marcato
      m_nMarkObj = RevertOldIdInObjTree()
   End Sub

   Private Sub OnExportedProject(ByVal sender As Object) Handles Scene1.OnExportedProject
      ' rimarco eventuale oggetto smarcato
      SelectIdInObjTree(m_nMarkObj)
   End Sub

   Private Sub OnExecutingScript(ByVal sender As Object, ByVal sFile As String) Handles Scene1.OnExecutingScript
      WritePrivateProfileString("General", "LastLuaDir", Path.GetDirectoryName(sFile), m_sIniFile)
      ClearObjTree()
   End Sub

   Private Sub OnExecutedScript(ByVal sender As Object) Handles Scene1.OnExecutedScript
      m_bModified = True
      LoadObjTree()
   End Sub

 '-------------------------------- Buttons --------------------------------------------------------
   Private Sub btnNew_Click(sender As System.Object, e As System.EventArgs) Handles btnNew.Click
      ' gestisco eventuale file corrente modificato
      If Not ManageModified() Then
         Return
      End If
      ' eseguo
      Scene1.NewProject()
   End Sub

   Private Sub btnOpen_Click(sender As System.Object, e As System.EventArgs) Handles btnOpen.Click
      ' gestisco eventuale file corrente modificato
      If Not ManageModified() Then
         Return
      End If
      ' eseguo
      Dim sDir As String = String.Empty
      GetPrivateProfileString("General", "LastNgeDir", "", sDir, m_sIniFile)
      Scene1.OpenProject(sDir)
   End Sub

   Private Sub btnSave_Click(sender As System.Object, e As System.EventArgs) Handles btnSave.Click
      Scene1.SaveProject(m_sCurrFile)
   End Sub

   Private Sub btnSaveAs_Click(sender As System.Object, e As System.EventArgs) Handles btnSaveAs.Click
      Scene1.SaveAsProject(m_sCurrFile)
   End Sub

   Private Sub btnImport_Click(sender As System.Object, e As System.EventArgs) Handles btnImport.Click
      ' gestisco eventuale file corrente modificato
      If Not ManageModified() Then
         Return
      End If
      ' eseguo
      Dim sDir As String = String.Empty
      GetPrivateProfileString("General", "LastImpDir", "", sDir, m_sIniFile)
      Scene1.ImportProject(sDir)
   End Sub

   Private Sub btnExport_Click(sender As System.Object, e As System.EventArgs) Handles btnExport.Click
      Scene1.ExportProject(Path.ChangeExtension(m_sCurrFile, "dxf"))
   End Sub

   Private Sub btnExec_Click(sender As System.Object, e As System.EventArgs) Handles btnExec.Click
      Dim sDir As String = String.Empty
      GetPrivateProfileString("General", "LastLuaDir", "", sDir, m_sIniFile)
      Scene1.Exec(sDir)
   End Sub

   Private Sub rbtWireFrame_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles rbtWireFrame.CheckedChanged
      EgtSetShowMode(SM_WIREFRAME)
   End Sub

   Private Sub rbtHiddenLine_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles rbtHiddenLine.CheckedChanged
      EgtSetShowMode(SM_HIDDENLINE)
   End Sub

   Private Sub rbtShading_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles rbtShading.CheckedChanged
      EgtSetShowMode(SM_SHADING)
   End Sub

   Private Sub chkCurveDir_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles chkCurveDir.CheckedChanged
      EgtSetShowCurveDirection(chkCurveDir.Checked)
   End Sub

   Private Sub chkAnalyze_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles chkAnalyze.CheckedChanged
      If chkAnalyze.Checked Then
         chkGetDist.Checked = False
         Scene1.SetStatusAnalyze()
      Else
         Scene1.ResetStatusAnalyze()
         SelectIdInObjTree(GDB_ID_NULL)
      End If
   End Sub

   Private Sub chkGetDist_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles chkGetDist.CheckedChanged
      If chkGetDist.Checked Then
         chkAnalyze.Checked = False
         Scene1.SetStatusGetDistance()
         ToolStripStatusOutput.Text = "  "
      Else
         Scene1.ResetStatusGetDistance()
         EgtResetGeoLine()
         ToolStripStatusOutput.Text = "  "
      End If
   End Sub

   Private Sub btnZoomAll_Click(sender As System.Object, e As System.EventArgs) Handles btnZoomAll.Click
      EgtZoom(ZM_ALL)
   End Sub

   Private Sub btnZoomIn_Click(sender As System.Object, e As System.EventArgs) Handles btnZoomIn.Click
      EgtZoom(ZM_IN)
   End Sub

   Private Sub btnZoomOut_Click(sender As System.Object, e As System.EventArgs) Handles btnZoomOut.Click
      EgtZoom(ZM_OUT)
   End Sub

   Private Sub btnTop_Click(sender As System.Object, e As System.EventArgs) Handles btnTop.Click
      EgtSetView(CT_TOP)
   End Sub

   Private Sub btnFront_Click(sender As System.Object, e As System.EventArgs) Handles btnFront.Click
      EgtSetView(CT_FRONT)
   End Sub

   Private Sub btnLeft_Click(sender As System.Object, e As System.EventArgs) Handles btnLeft.Click
      EgtSetView(CT_LEFT)
   End Sub

   Private Sub btnBack_Click(sender As System.Object, e As System.EventArgs) Handles btnBack.Click
      EgtSetView(CT_BACK)
   End Sub

   Private Sub btnRight_Click(sender As System.Object, e As System.EventArgs) Handles btnRight.Click
      EgtSetView(CT_RIGHT)
   End Sub

   Private Sub btnIsoSW_Click(sender As System.Object, e As System.EventArgs) Handles btnIsoSW.Click
      Scene1.IsoViewSW()
   End Sub

   Private Sub btnIsoSE_Click(sender As System.Object, e As System.EventArgs) Handles btnIsoSE.Click
      Scene1.IsoViewSE()
   End Sub

   Private Sub btnIsoNE_Click(sender As System.Object, e As System.EventArgs) Handles btnIsoNE.Click
      Scene1.IsoViewNE()
   End Sub

   Private Sub btnIsoNW_Click(sender As System.Object, e As System.EventArgs) Handles btnIsoNW.Click
      Scene1.IsoViewNW()
   End Sub

   Private Sub btnRotP90_Click(sender As System.Object, e As System.EventArgs) Handles btnRotP90.Click
      Rotate(90)
      ' aggiorno visualizzazione
      EgtZoom(ZM_ALL)
      UpdateObjInObjTree(m_nOldIdTree)
   End Sub

   Private Sub btnRotM90_Click(sender As System.Object, e As System.EventArgs) Handles btnRotM90.Click
      Rotate(-90)
      ' aggiorno visualizzazione
      EgtZoom(ZM_ALL)
      UpdateObjInObjTree(m_nOldIdTree)
   End Sub

   Private Sub Rotate(ByVal dAngRotDeg As Double)
      ' indice del primo gruppo sotto la radice
      Dim nId As Integer = EgtGetFirstInGroup(GDB_ID_ROOT)
      ' recupero il box del gruppo in globale
      Dim PtMinPre As New Point3d
      Dim PtMaxPre As New Point3d
      EgtGetBBoxGlob(nId, BBF_IGNORE_TEXT + BBF_EXACT, PtMinPre, PtMaxPre)
      ' ruoto attorno al punto minimo
      EgtRotateGlob(nId, PtMinPre, Vector3d.Z_AX, dAngRotDeg)
      ' calcolo nuovo box in globale
      Dim PtMinPost As New Point3d
      Dim PtMaxPost As New Point3d
      EgtGetBBoxGlob(nId, BBF_IGNORE_TEXT + BBF_EXACT, PtMinPost, PtMaxPost)
      ' eseguo traslazione per riavere lo stesso punto minimo
      Dim VtMove As Vector3d = PtMinPre - PtMinPost
      EgtMoveGlob(nId, VtMove)
   End Sub

   Private Sub btnMirror_Click(sender As System.Object, e As System.EventArgs) Handles btnMirror.Click
      ' indice del primo gruppo sotto la radice
      Dim nId As Integer = EgtGetFirstInGroup(GDB_ID_ROOT)
      ' recupero il box del gruppo in globale
      Dim PtMin As New Point3d
      Dim PtMax As New Point3d
      EgtGetBBoxGlob(nId, BBF_IGNORE_TEXT + BBF_EXACT, PtMin, PtMax)
      Dim PtCen As Point3d = Point3d.Media(PtMin, PtMax)
      ' mirror rispetto a Y centrato nel box
      EgtMirrorGlob(nId, PtCen, Vector3d.X_AX)
      ' sistemo gli eventuali testi
      UnMirrorTexts(nId)
      ' aggiorno visualizzazione
      EgtZoom(ZM_ALL)
      UpdateObjInObjTree(m_nOldIdTree)
   End Sub

   Private Sub UnMirrorTexts(ByVal nGroupId As Integer)
      Dim nId As Integer = EgtGetFirstInGroup(nGroupId)
      While nId <> GDB_ID_NULL
         'recupero il tipo di oggetto
         Dim nType As Integer = EgtGetType(nId)
         'se gruppo
         If nType = TY_GROUP Then
            UnMirrorTexts(nId)
         ' se testo
         ElseIf nType = TY_EXT_TEXT Then
            EgtMirrorText(nId, True)
         End If
         ' passo al successivo
         nId = EgtGetNext(nId)
      End While
   End Sub


   Private Const EI_ST_NULL As Integer = 0
   Private Const EI_ST_MOVE1 As Integer = 1
   Private Const EI_ST_MOVE2 As Integer = 2
   Private m_nStatus As Integer = EI_ST_NULL
   Private m_ptStart As Point3d
   Private m_ptCurr As Point3d

   Private Sub btnMove_Click(sender As System.Object, e As System.EventArgs) Handles btnMove.Click
      ' posso partire solo da stato libero
      If m_nStatus <> EI_ST_NULL Then
         Return
      End If
      ' verifico ci sia qualcosa di selezionato
      If EgtGetFirstSelectedObj() = GDB_ID_NULL Then
         Return
      End If
      ' creo il gruppo di drag e vi copio le entità selezionate
      If Not Scene1.CreateDragGroup() Then
         Return
      End If
      Dim nId As Integer = EgtGetFirstSelectedObj()
      While nId <> GDB_ID_NULL
         If Not Scene1.AddToDragGroup(nId) Then
            Scene1.EraseDragGroup()
            Return
         End If
         nId = EgtGetNextSelectedObj()
      End While
      ' imposto stato di scena a selezione punto
      Scene1.SetStatusSelPoint()
      ' imposto stato a primo punto per move
      m_nStatus = EI_ST_MOVE1
      ToolStripStatusOutput.Text = "Select Start Point"
   End Sub

   Private Sub OnMouseSelectedPoint(ByVal sender As Object, ByVal PtP As Point3d) Handles Scene1.OnMouseSelectedPoint
      If m_nStatus = EI_ST_MOVE1 Then
         m_ptStart = PtP
         m_ptCurr = PtP
         m_nStatus = EI_ST_MOVE2
         ToolStripStatusOutput.Text = "Select End Point"
      ElseIf m_nStatus = EI_ST_MOVE2 Then
         ' cancello gruppo di drag e linea temporanea
         Scene1.EraseDragGroup()
         EgtResetGeoLine(False)
         ' eseguo movimento
         Dim VtMove As Vector3d = PtP - m_ptStart
         EgtMoveGlob(GDB_ID_SEL, VtMove)
         EgtDeselectAll()
         EgtDraw()
         ' reset stato di scena
         Scene1.ResetStatusSelPoint()
         ' reset stato
         m_nStatus = EI_ST_NULL
         ToolStripStatusOutput.Text = ""
      End If
   End Sub

   Private Sub OnMouseMoveSelPoint(ByVal sender As Object, ByVal PtP As Point3d) Handles Scene1.OnMouseMoveSelPoint
      If m_nStatus = EI_ST_MOVE2 Then
         Dim VtMove As Vector3d = PtP - m_ptCurr
         EgtMoveGlob(Scene1.GetDragGroup(), VtMove)
         EgtSetGeoLine(m_ptStart, PtP)
         EgtDraw()
         m_ptCurr = PtP
      End If
   End Sub


  '-------------------------------- KeyDown --------------------------------------------------------
   Private Sub Form1_KeyDown(ByVal sender As System.Object, ByVal e As KeyEventArgs) Handles MyBase.KeyDown
      ' Con ESC esco dall'azione corrente
      If e.KeyData = Keys.Escape Then
         ' reset Azione corrente
         Scene1.EraseDragGroup()
         EgtResetGeoLine(False)
         m_nStatus = EI_ST_NULL
         Scene1.ResetStatusSelPoint()
         ' reset Analisi e Distanza
         chkAnalyze.Checked = False
         chkGetDist.Checked = False
         ' pulisco output
         ToolStripStatusOutput.Text = ""
         ' aggiorno disegno
         EgtDraw()
      End If
   End Sub


  '-------------------------------- Command Box ----------------------------------------------------
   Private Sub tboxCmd_KeyDown(sender As System.Object, e As System.Windows.Forms.KeyEventArgs) Handles tboxCmd.KeyDown
      If (e.KeyCode = Keys.Enter) Then
         Dim nLine As Integer = tboxCmd.GetLineFromCharIndex(tboxCmd.GetFirstCharIndexOfCurrentLine)
         Dim sCmd As String = tboxCmd.Lines(nLine).ToString
         If Not String.IsNullOrEmpty(sCmd) Then
            ' ripristino stato oggetto marcato
            Dim nIdOld As Integer = RevertOldIdInObjTree()
            ' eseguo comando
            If EgtTscExecLine(sCmd) Then
               Scene1.Invalidate()
               ToolStripStatusOnR.Text = "   "
            Else
               ToolStripStatusOnR.Text = "Error executing command"
            End If
            ' ricarico albero degli oggetti
            LoadObjTree()
            SelectIdInObjTree(nIdOld)
         End If
      End If
   End Sub

 '-------------------------------- Tree View ------------------------------------------------------
   Private m_nOldIdTree As Integer

   Private Sub LoadObjTree()
      ClearObjTree()
      TreeView1.BeginUpdate()
      TreeView1.Nodes.Add(GDB_ID_NULL.ToString, "No Selection", 0, 0)
      AddGroupInObjTree(GDB_ID_ROOT, TreeView1.Nodes)
      TreeView1.EndUpdate()
   End Sub

   Private Sub ClearObjTree()
      RevertOldIdInObjTree()
      TreeView1.Nodes.Clear()
   End Sub

   Private Sub AddGroupInObjTree(ByVal nGroupId As Integer, ByRef PrevNodColl As TreeNodeCollection)

      Dim CurrNodColl As TreeNodeCollection

      If nGroupId = GDB_ID_ROOT Then
         CurrNodColl = PrevNodColl
      Else
         Dim sName As String = String.Empty
         Dim sText As String = String.Empty
         If EgtGetName(nGroupId, sName) Then
            sText = sName + " (Group " + nGroupId.ToString + ")"
         Else
            sText = "Group " + nGroupId.ToString
         End If
         Dim nImage As Integer = TypeToImageInObjTree(TY_GROUP)
         CurrNodColl = PrevNodColl.Add(nGroupId.ToString, sText, nImage, nImage).Nodes
      End If

      Dim nObjs As Integer = EgtGetGroupObjs(nGroupId)
      If (nObjs > 20000) Then
         CurrNodColl.Add("-1", "Too many entities")
         Return
      End If

      Dim nId As Integer = EgtGetFirstInGroup(nGroupId)
      While nId <> GDB_ID_NULL
         'recupero il tipo di nodo
         Dim nType As Integer = EgtGetType(nId)
         'se gruppo
         If nType = TY_GROUP Then
            AddGroupInObjTree(nId, CurrNodColl)
         'se oggetto geometrico
         ElseIf nType >= TY_GEO_VECTOR Then
            Dim sTitle As String = String.Empty
            EgtGetTitle(nId, sTitle)
            Dim sName As String = String.Empty
            Dim sText As String = String.Empty
            If EgtGetName(nId, sName) Then
               sText = sName + " (" + sTitle + " " + nId.ToString + ")"
            Else
               sText = sTitle + " " + nId.ToString
            End If
            Dim nImage As Integer = TypeToImageInObjTree(nType)
            CurrNodColl.Add(nId.ToString, sText, nImage, nImage)
         End If
         'passo al successivo
         nId = EgtGetNext(nId)
      End While
   End Sub

   Private Function TypeToImageInObjTree(ByVal nType As Integer) As Integer
      Select Case nType
      Case TY_GROUP
         Return 2
      Case TY_GEO_VECTOR
         Return 3
      Case TY_GEO_POINT
         Return 4
      Case TY_GEO_FRAME
         Return 5
      Case TY_CRV_LINE
         Return 6
      Case TY_CRV_ARC
         Return 7
      Case TY_CRV_BEZ
         Return 8
      Case TY_CRV_COMPO
         Return 9
      Case TY_SRF_MESH
         Return 10
      Case TY_EXT_TEXT
         Return 11
      End Select
      Return 1
   End Function

   Private Sub ObjTree_AfterSelect(ByVal sender As Object, ByVal e As TreeViewEventArgs) Handles TreeView1.AfterSelect
      ' recupero l'Id del nuovo oggetto selezionato
      Dim nId As Integer
      If Not Int32.TryParse(e.Node.Name, nId) Then
         Return
      End If
      UpdateObjInObjTree(nId)
   End Sub

   Private Sub UpdateObjInObjTree(ByVal nId As Integer)
      ' ripristino eventuale vecchio oggetto selezionato
      RevertOldIdInObjTree()
      ' recupero il tipo del nuovo oggetto
      Dim nType As Integer = EgtGetType(nId)
      ' stampa dei dati del nuovo oggetto
      Dim sDump As String = String.Empty
      If nType = TY_NONE Then
         tBoxInfo.Text = String.Empty
      ElseIf nType = TY_GROUP Then
         If EgtGroupDump(nId, sDump) Then
            tBoxInfo.Text = sDump
         Else
            tBoxInfo.Text = String.Empty
         End If
      Else
         If EgtGeoObjDump(nId, sDump) Then
            tBoxInfo.Text = sDump
         Else
            tBoxInfo.Text = String.Empty
         End If
      End If
      ' permetto in ogni caso la visualizzazione dell'oggetto e lo evidenzio
      Dim nOldMode As Integer = GDB_MD_STD
      EgtGetMode(nId, nOldMode)
      Dim nMode As Integer = IIf((nOldMode = GDB_MD_HIDDEN), GDB_MD_STD, nOldMode)
      EgtSetMode(nId, nMode)
      Dim nOldStatus As Integer = GDB_ST_ON
      EgtGetStatus(nId, nOldStatus)
      Dim nStat As Integer = IIf((nOldStatus = GDB_ST_OFF), GDB_ST_ON, nOldStatus)
      EgtSetStatus(nId, nStat)
      EgtSetMark(nId)
      m_nOldIdTree = nId
      ' imposto il ridisegno della scena
      Scene1.Invalidate()
   End Sub

   Private Function RevertOldIdInObjTree() As Integer
      ' salvo il vecchio Id
      Dim nOldId As Integer = m_nOldIdTree
      ' se non nullo...
      If EgtExistsObj(m_nOldIdTree) Then
         ' ripristino il modo e lo stato precedente dell'oggetto e lo smarco
         EgtRevertMode(m_nOldIdTree)
         EgtRevertStatus(m_nOldIdTree)
         EgtResetMark(m_nOldIdTree)
         ' annullo oggetto da ripristinare
         m_nOldIdTree = GDB_ID_NULL
      End If
      Return nOldId
   End Function

   Private Function SelectIdInObjTree(ByVal nId As Integer) As Boolean
      Dim tNode() As TreeNode = TreeView1.Nodes.Find(nId.ToString, True)
      If tNode.Length > 0 Then
         TreeView1.SelectedNode = tNode(0)
         Return True
      Else
         Return False
      End If
   End Function

 '-------------------------------- Utilities ------------------------------------------------------
   Private Function ManageModified() As Boolean
      ' se non modificato, procedo normalmente
      If Not m_bModified Then
         Return True
      End If
      ' chiedo cosa fare
      Dim sMsg As String = "Salvare le modifiche"
      If Not String.IsNullOrEmpty(m_sCurrFile) Then
         sMsg += " a " + m_sCurrFile
      End If
      sMsg += " ?"
      Dim nRes = MessageBox.Show(sMsg, "", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question)
      Select Case nRes
      Case Windows.Forms.DialogResult.Yes
         Scene1.SaveProject(m_sCurrFile)
         Return True
      Case Windows.Forms.DialogResult.No
         Return True
      Case Else
         Return False
      End Select
   End Function

   Private Sub EmitTitle()
      ' nome file
      Dim sTitle As String = m_sCurrFile
      If String.IsNullOrEmpty(m_sCurrFile) Then
         sTitle = "New"
      End If
      ' indicazione di modificato 
      If m_bModified Then
         sTitle += "*"
      End If
      ' dati del prodotto
      sTitle += " - EgalTech TestEGr"
      ' emissione del titolo
      Me.Text = sTitle
   End Sub


End Class