data/DWSIM.Drawing/GraphicsSurface/DesignSurface.vb

'Copyright (C) 2002 Microsoft Corporation
'All rights reserved.
'
'THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
'EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
'MERCHANTIBILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
'
'Date: June 2002
'Author: Duncan Mackenzie
'
'Requires the release version of .NET Framework

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Runtime.Serialization
Imports System.Linq
Imports System.Collections.Generic
Imports System.Windows.Forms
Imports DWSIM.DrawingTools.GraphicObjects
Imports DWSIM.Interfaces.Enums.GraphicObjects

<System.Serializable()> Public Class GraphicsSurface

    Inherits System.Windows.Forms.UserControl

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call
        Me.SetStyle(ControlStyles.AllPaintingInWmPaint, True)
        Me.SetStyle(ControlStyles.DoubleBuffer, True)
        Me.SetStyle(ControlStyles.UserPaint, True)
        Me.SetStyle(ControlStyles.ResizeRedraw, True)
    End Sub

    'UserControl1 overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.SuspendLayout()
        '
        'GraphicsSurface
        '
        Me.AutoScroll = True
        Me.BackColor = System.Drawing.SystemColors.Window
        Me.Name = "GraphicsSurface"
        Me.ResumeLayout(False)

    End Sub

#End Region

#Region "Events"

    Public Event SelectionChanged(ByVal sender As Object, ByVal e As SelectionChangedEventArgs)
    Public Event StatusUpdate(ByVal sender As Object, ByVal e As StatusUpdateEventArgs)
#End Region

    Private Const MinimumGridSize As Single = 10
    Private dragOffset As New Point(0, 0)
    Private dragStart As New Point(0, 0)

    Public selectionDragging As Boolean = False
    Private selectable As Boolean = True
    Public dragging As Boolean = False
    Private draggingfs As Boolean = False
    Private rotating As Boolean = False
    Private hoverdraw As Boolean = False
    Private startingRotation As Single = 0
    Private originalRotation As Single = 0
    Private selectionRect As Rectangle
    Private rectp0 As New Point
    Private hoverRect As Rectangle
    Private hoverrotation As Integer = 0
    Private Size0 As Size

    Private justselected As Boolean = False

    Private m_SurfaceBounds As New Rectangle(0, 0, 10000, 7000)
    Private m_SurfaceMargins As New Rectangle(10, 10, 10000, 7000)
    Public m_HorizRes As Integer = 300
    Public m_VertRes As Integer = 300
    Private m_ShowGrid As Boolean = True
    Private m_NonPrintingAreaColor As Color = Color.Gray
    Private m_GridColor As Color = Color.LightBlue
    Private m_GridSize As Single = 50
    Private m_GridLineWidth As Integer = 1
    Private m_MarginLineWidth As Integer = 1
    Private m_MarginColor As Color = Color.Green
    Private m_SelectedObject As GraphicObject
    Private m_Zoom As Single = 0.5

    Private m_snaptogrid As Boolean = False
    Private m_mousehoverselect As Boolean = False
    Private m_quickconnectmode As Boolean = False

    Public m_drawingObjects As New GraphicObjectCollection()

    Public m_SelectedObjects As New Collections.Generic.Dictionary(Of String, GraphicObject)

    Public Enum AlignDirection
        Lefts
        Centers
        Rights
        Tops
        Middles
        Bottoms
        EqualizeHorizontal
        EqualizeVertical
    End Enum

#Region "Saving / Loading"

    Public Overridable Sub LoadFromFile(ByVal fileName As String)
        'load objects from a binary file
        Try
            Dim settingsPath As String = fileName
            Dim myBinarySerializer As New Formatters.Binary.BinaryFormatter()
            m_drawingObjects = myBinarySerializer.Deserialize( _
                New IO.FileStream(settingsPath, IO.FileMode.Open))
            Me.SelectedObject = Nothing
            RaiseEvent StatusUpdate(Me, _
                New StatusUpdateEventArgs(StatusUpdateType.FileLoaded, _
                Nothing, String.Format("file {0} loaded into the Graphic Surface", fileName), _
                Nothing, Nothing))
            Me.Invalidate()
        Catch e As Exception
            Throw New ApplicationException("File failed to load.", e)
        End Try

    End Sub


    Public Overridable Sub SaveToFile(ByVal fileName As String)
        'save objects to a binary file
        Try
            Dim settingsPath As String = fileName
            Dim myBinarySerializer As New Formatters.Binary.BinaryFormatter()
            myBinarySerializer.Serialize( _
                New IO.FileStream(settingsPath, IO.FileMode.Create), _
                Me.DrawingObjects)
            RaiseEvent StatusUpdate(Me, _
                New StatusUpdateEventArgs(StatusUpdateType.FileSaved, _
                m_SelectedObject, _
                String.Format("Graphic Surface saved to file {0}", fileName), _
                Nothing, Nothing))
        Catch e As Exception
            Throw New ApplicationException("Save Failed.", e)
        End Try
    End Sub

#End Region

    <Xml.Serialization.XmlIgnore> <NonSerialized> Private _editorform As System.Windows.Forms.Form

    Public Property Editor As Form
        Get
            Return _editorform
        End Get
        Set(value As Form)
            _editorform = value
        End Set
    End Property

    Public Property ResizingMode As Boolean = False
    Public Property ResizingMode_KeepAR As Boolean = True

    Public Property QuickConnect() As Boolean
        Get
            Return m_quickconnectmode
        End Get
        Set(ByVal value As Boolean)
            m_quickconnectmode = value
        End Set
    End Property

    Public Property SurfaceBounds() As Rectangle
        'bounds in 1/100ths of an inch, just like the printer objects use
        Get
            Return m_SurfaceBounds
        End Get
        Set(ByVal Value As Rectangle)
            m_SurfaceBounds = Value
            Me.Invalidate()
        End Set
    End Property

    Public Property SnapToGrid() As Boolean
        Get
            Return m_snaptogrid
        End Get
        Set(ByVal value As Boolean)
            m_snaptogrid = value
        End Set
    End Property

    Public Property MouseHoverSelect() As Boolean
        Get
            Return m_mousehoverselect
        End Get
        Set(ByVal value As Boolean)
            m_mousehoverselect = value
        End Set
    End Property

    Public Property SurfaceMargins() As Rectangle
        'bounds in 1/100ths of an inch, just like the printer objects use
        Get
            Return m_SurfaceMargins
        End Get
        Set(ByVal Value As Rectangle)
            m_SurfaceMargins = Value
        End Set
    End Property

    Public Property Zoom() As Single
        Get
            Return m_Zoom
        End Get
        Set(ByVal Value As Single)
            Dim xp, yp As Double
            xp = Me.HorizontalScroll.Value / (m_Zoom * Me.Width)
            yp = Me.VerticalScroll.Value / (m_Zoom * Me.Height)
            If Value > 0.05 Then
                If Value > 100 Then
                    m_Zoom = 100.0#
                    Me.Invalidate()
                    Me.HorizontalScroll.Value = xp * 100.0# * Me.Width
                    Me.VerticalScroll.Value = yp * 100.0# * Me.Height
                    Me.Invalidate()
                Else
                    m_Zoom = Value
                    Me.Invalidate()
                    If Not xp * Value * Me.Width < Me.HorizontalScroll.SmallChange And Not xp * Value * Me.Width > Me.HorizontalScroll.Maximum Then
                        Me.HorizontalScroll.Value = Convert.ToInt32(xp * Value * Me.Width)
                    End If
                    If Not yp * Value * Me.Height < Me.HorizontalScroll.SmallChange And Not yp * Value * Me.Height > Me.VerticalScroll.Maximum Then
                        Me.VerticalScroll.Value = Convert.ToInt32(yp * Value * Me.Height)
                    End If
                    Me.Invalidate()
                End If
            Else
                m_Zoom = 0.05
                Me.Invalidate()
                Me.HorizontalScroll.Value = xp * 0.05 * Me.Width
                Me.VerticalScroll.Value = yp * 0.05 * Me.Height
                Me.Invalidate()
            End If
        End Set
    End Property

    Public Property SelectRectangle() As Boolean
        Get
            Return selectable
        End Get
        Set(ByVal Value As Boolean)
            selectable = Value
        End Set
    End Property

    Public Overridable ReadOnly Property DrawingObjects() As GraphicObjectCollection
        Get
            Return m_drawingObjects
        End Get
    End Property

    Public Overridable Property MarginColor() As Color
        Get
            Return m_MarginColor
        End Get
        Set(ByVal Value As Color)
            m_MarginColor = Value
        End Set
    End Property

    Public Overridable Property MarginLineWidth() As Integer
        Get
            Return m_MarginLineWidth
        End Get
        Set(ByVal Value As Integer)
            If Value > 0 Then
                m_MarginLineWidth = Value
            Else
                Throw New ArgumentOutOfRangeException("MarginLineWidth", _
                    "MarginLineWidth must be greater than zero")
            End If
        End Set
    End Property

    Public Overridable Property ShowGrid() As Boolean
        Get
            Return m_ShowGrid
        End Get
        Set(ByVal Value As Boolean)
            m_ShowGrid = False
        End Set
    End Property

    Public Overridable Property GridColor() As Color
        Get
            Return m_GridColor
        End Get
        Set(ByVal Value As Color)
            m_GridColor = Value
        End Set
    End Property

    Public Overridable Property NonPrintingAreaColor() As Color
        Get
            Return m_NonPrintingAreaColor
        End Get
        Set(ByVal Value As Color)
            m_NonPrintingAreaColor = Value
        End Set
    End Property

    Public Overridable Property GridLineWidth() As Integer
        Get
            Return m_GridLineWidth
        End Get
        Set(ByVal Value As Integer)
            If Value > 0 Then
                m_GridLineWidth = Value
            Else
                Throw New ArgumentOutOfRangeException("GridLineWidth", _
                    "GridLineWidth must be greater than zero")
            End If
        End Set
    End Property

    Public Overridable Property GridSize() As Single
        'in 100ths of an inch
        Get
            Return m_GridSize
        End Get
        Set(ByVal Value As Single)
            If Value > MinimumGridSize Then
                m_GridSize = Value
            Else
                Throw New ArgumentOutOfRangeException("GridSize", _
                        String.Format("Grid Size must be greater than {0}", MinimumGridSize))
            End If
        End Set
    End Property

    Public Property DrawFloatingTables As Boolean = True

    Public Property DrawPropertyLists As Boolean = False

    Protected Function ConvertToHPixels(ByVal value As Single) As Single
        Return value * Me.m_HorizRes
    End Function

    Protected Function ConvertToVPixels(ByVal value As Single) As Single
        Return value * Me.m_VertRes
    End Function

    Protected Function ConvertToPixels(ByVal rect As Rectangle) As Rectangle
        'convert from 100ths of an inch to pixels
        Dim Bounds As Rectangle
        Bounds = New Rectangle(ConvertToHPixels(rect.X / 100), _
            ConvertToVPixels(rect.Y / 100), _
            ConvertToHPixels(rect.Width / 100), _
            ConvertToVPixels(rect.Height / 100))
        Return Bounds
    End Function

    Protected Function ZoomRectangle(ByVal originalRect As Rectangle) As Rectangle
        Dim myNewRect As New Rectangle(originalRect.X * Me.Zoom, _
                originalRect.Y * Me.Zoom, _
                originalRect.Width * Me.Zoom, _
                originalRect.Height * Me.Zoom)
        Return myNewRect
    End Function

    Protected Function DeZoomRectangle(ByVal originalRect As Rectangle) As Rectangle
        Dim myNewRect As New Rectangle(originalRect.X / Me.Zoom, _
                originalRect.Y / Me.Zoom, _
                originalRect.Width / Me.Zoom, _
                originalRect.Height / Me.Zoom)
        Return myNewRect
    End Function

    Public Overridable Sub DrawGrid(ByVal g As Graphics)
        Dim bounds As Rectangle
        Dim horizGridSize As Integer = ConvertToHPixels(GridSize / 100) '* Me.Zoom
        Dim vertGridSize As Integer = ConvertToVPixels(GridSize / 100) '* Me.Zoom
        bounds = ConvertToPixels(SurfaceBounds)
        bounds = ZoomRectangle(bounds)
        If Me.AutoScrollMinSize.Height <> bounds.Height _
            AndAlso Me.AutoScrollMinSize.Width <> bounds.Width Then
            Me.AutoScrollMinSize = New Size(bounds.Width, bounds.Height)
        End If

        g.Clear(m_NonPrintingAreaColor)
        g.FillRectangle(New SolidBrush(Me.BackColor), bounds)

        Dim gridPen As New Pen(GridColor, m_GridLineWidth)
        'gridPen.DashStyle = DashStyle.Dot
        Dim i As Integer
        For i = vertGridSize To bounds.Height Step vertGridSize
            g.DrawLine(gridPen, 0, i, bounds.Width, i)
        Next
        For i = horizGridSize To bounds.Width Step horizGridSize
            g.DrawLine(gridPen, i, 0, i, bounds.Height)
        Next
    End Sub

    Protected Overridable Sub DrawMargins(ByVal g As Graphics)
        Dim margins As Rectangle = ZoomRectangle(ConvertToPixels(Me.m_SurfaceMargins))
        Dim marginPen As New Pen(m_MarginColor)
        marginPen.DashStyle = Drawing2D.DashStyle.Dash
        marginPen.Width = m_MarginLineWidth
        g.DrawRectangle(marginPen, margins)
    End Sub

    Public Function IsRunningOnMono() As Boolean
        Return Not Type.GetType("Mono.Runtime") Is Nothing
    End Function

    Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)

        'Try
        Dim g As Graphics = e.Graphics

        With g

            If Not dragging Then

                .InterpolationMode = InterpolationMode.Bilinear
                .PixelOffsetMode = PixelOffsetMode.HighSpeed
                .CompositingMode = CompositingMode.SourceOver
                .CompositingQuality = CompositingQuality.HighSpeed
                .TextRenderingHint = Drawing.Text.TextRenderingHint.SystemDefault
                .SmoothingMode = SmoothingMode.AntiAlias

            Else

                .InterpolationMode = InterpolationMode.NearestNeighbor
                .PixelOffsetMode = PixelOffsetMode.HighSpeed
                .CompositingMode = CompositingMode.SourceOver
                .CompositingQuality = CompositingQuality.HighSpeed
                .TextRenderingHint = Drawing.Text.TextRenderingHint.SingleBitPerPixel
                .SmoothingMode = SmoothingMode.None

            End If

        End With


        'get the dpi settings of the graphics context,
        'for example; 96dpi on screen, 600dpi for the printer
        'used to adjust grid and margin sizing.

        Me.m_HorizRes = g.DpiX
        Me.m_VertRes = g.DpiY

        'handle the possibility that the viewport is scrolled,
        'adjust my origin coordintates to compensate
        Dim pt As Point = New Point(Me.AutoScrollPosition.X, Me.AutoScrollPosition.Y)
        g.TranslateTransform(pt.X, pt.Y)

        DrawGrid(g)

        If hoverdraw Then

            Dim myOriginalMatrix As New Drawing2D.Matrix

            Dim gCon1 As Drawing2D.GraphicsContainer = g.BeginContainer

            If Not IsRunningOnMono() Then myOriginalMatrix = g.Transform()

            If hoverrotation <> 0 Then
                myOriginalMatrix.RotateAt(hoverrotation, New PointF((hoverRect.X + hoverRect.Width / 2) * Zoom, (hoverRect.Y + hoverRect.Height / 2) * Zoom), _
                    Drawing2D.MatrixOrder.Append)
                g.Transform = myOriginalMatrix
            End If

            g.ScaleTransform(Zoom, Zoom)

            g.PageUnit = GraphicsUnit.Pixel

            Dim color1, color2, color3 As Color
            color1 = Color.FromArgb(50, 170, 215, 230)
            color2 = Color.FromArgb(50, 2, 140, 140)
            color3 = Color.FromArgb(50, 2, 140, 140)

            Dim gbrush As New LinearGradientBrush(hoverRect, color1, color2, LinearGradientMode.Vertical)
            DrawRoundRect(g, New Pen(color3, 1), hoverRect.X, hoverRect.Y, hoverRect.Width, hoverRect.Height, 15, gbrush)

            If Not IsRunningOnMono() Then g.Transform = myOriginalMatrix
            g.EndContainer(gCon1)

        End If

        'draw the actual objects onto the page, on top of the grid

        If Me.SelectedObject Is Nothing Then Me.SelectedObjects.Clear()

        For Each gr As GraphicObject In Me.SelectedObjects.Values
            gr.Selected = True
            Me.DrawingObjects.DrawSelectedObject(g, gr, Me.Zoom)
        Next

        For Each gr As GraphicObject In Me.DrawingObjects
            If Not Me.SelectedObjects.ContainsKey(gr.Name) Then gr.Selected = False
        Next

        With Me.DrawingObjects
            .HorizontalResolution = g.DpiX
            .VerticalResolution = g.DpiY
            .DrawObjects(g, Me.Zoom, dragging)
        End With

        If DrawPropertyLists Then
            For Each gr As GraphicObject In Me.DrawingObjects
                If gr.Calculated Then
                    DrawPropertyListBlock(g, gr)
                End If
            Next
        End If

        'Draw dashed line margin indicators, over top of objects
        DrawMargins(g)

        'draw selection rectangle (click and drag to select interface)
        'on top of everything else, but transparent
        If selectionDragging Then
            DrawSelectionRectangle(g, selectionRect)
        End If
        'Catch ex As System.Exception
        'Debug.WriteLine(ex.ToString)
        'Throw New System.ApplicationException("Error Drawing Graphics Surface", ex)
        ' End Try

        If ResizingMode Then
            For Each obj In DrawingObjects
                If obj.ObjectType <> ObjectType.Nenhum And obj.ObjectType <> ObjectType.GO_FloatingTable And
                    obj.ObjectType <> ObjectType.GO_MasterTable And obj.ObjectType <> ObjectType.GO_SpreadsheetTable And
                    obj.ObjectType <> ObjectType.GO_Table Then
                    DrawResizingAnchors(g, Me.Zoom, obj)
                End If
            Next
        End If

    End Sub

    Sub DrawResizingAnchors(g As Graphics, Scale As Single, gobj As GraphicObject)

        Dim gCon As Drawing2D.GraphicsContainer

        Dim myOriginalMatrix As Drawing2D.Matrix
        myOriginalMatrix = g.Transform()

        gCon = g.BeginContainer()

        g.PageUnit = GraphicsUnit.Pixel
        g.ScaleTransform(Scale, Scale)

        g.DrawRectangle(New Pen(Brushes.SteelBlue, 2), gobj.GetBoundsRectangle)

        g.DrawRectangle(New Pen(Brushes.SteelBlue, 2), gobj.X - 2, gobj.Y - 2, 4, 4)
        g.DrawRectangle(New Pen(Brushes.SteelBlue, 2), gobj.X + gobj.Width - 2, gobj.Y - 2, 4, 4)
        g.DrawRectangle(New Pen(Brushes.SteelBlue, 2), gobj.X - 2, gobj.Y + gobj.Height - 2, 4, 4)
        g.DrawRectangle(New Pen(Brushes.SteelBlue, 2), gobj.X + gobj.Width - 2, gobj.Y + gobj.Height - 2, 4, 4)

        g.EndContainer(gCon)
        g.Transform = myOriginalMatrix

    End Sub


    Protected Overrides Function IsInputKey(ByVal keyData As Keys) As Boolean
        Select Case keyData
            Case Keys.Up
                Return True
            Case Keys.Down
                Return True
            Case Keys.Left
                Return True
            Case Keys.Right
                Return True
            Case Else
                Return MyBase.IsInputKey(keyData)
        End Select
    End Function

    Public Sub AlignSelectedObjects(direction As AlignDirection)

        If Me.SelectedObjects.Count > 1 Then

            Dim refpos As Integer = 0

            Select Case direction
                Case AlignDirection.Lefts
                    refpos = 10000000
                    For Each obj As GraphicObject In Me.SelectedObjects.Values
                        If obj.X < refpos Then refpos = obj.X
                    Next
                    For Each obj As GraphicObject In Me.SelectedObjects.Values
                        obj.X = refpos
                    Next
                Case AlignDirection.Centers
                    For Each obj As GraphicObject In Me.SelectedObjects.Values
                        refpos += obj.X + obj.Width / 2
                    Next
                    refpos /= Me.SelectedObjects.Count
                    For Each obj As GraphicObject In Me.SelectedObjects.Values
                        obj.X = refpos - obj.Width / 2
                    Next
                Case AlignDirection.Rights
                    For Each obj As GraphicObject In Me.SelectedObjects.Values
                        refpos += obj.X + obj.Width
                    Next
                    refpos /= Me.SelectedObjects.Count
                    For Each obj As GraphicObject In Me.SelectedObjects.Values
                        obj.X = refpos - obj.Width
                    Next
                Case AlignDirection.Tops
                    refpos = 10000000
                    For Each obj As GraphicObject In Me.SelectedObjects.Values
                        If obj.Y < refpos Then refpos = obj.Y
                    Next
                    For Each obj As GraphicObject In Me.SelectedObjects.Values
                        obj.Y = refpos
                    Next
                Case AlignDirection.Middles
                    For Each obj As GraphicObject In Me.SelectedObjects.Values
                        refpos += obj.Y + obj.Height / 2
                    Next
                    refpos /= Me.SelectedObjects.Count
                    For Each obj As GraphicObject In Me.SelectedObjects.Values
                        obj.Y = refpos - obj.Height / 2
                    Next
                Case AlignDirection.Bottoms
                    For Each obj As GraphicObject In Me.SelectedObjects.Values
                        refpos += obj.Y + obj.Height
                    Next
                    refpos /= Me.SelectedObjects.Count
                    For Each obj As GraphicObject In Me.SelectedObjects.Values
                        obj.Y = refpos - obj.Height
                    Next
                Case AlignDirection.EqualizeHorizontal
                    Dim orderedlist As List(Of GraphicObject) = Me.SelectedObjects.Values.OrderBy(Function(o) o.X).ToList
                    Dim avgdist As Integer, i As Integer
                    For i = 1 To orderedlist.Count - 1
                        avgdist += (orderedlist(i).X) - (orderedlist(i - 1).X + orderedlist(i - 1).Width)
                    Next
                    avgdist /= (orderedlist.Count - 1)
                    For i = 1 To orderedlist.Count - 1
                        orderedlist(i).X = orderedlist(i - 1).X + orderedlist(i - 1).Width + avgdist
                    Next
                Case AlignDirection.EqualizeVertical
                    Dim orderedlist As List(Of GraphicObject) = Me.SelectedObjects.Values.OrderBy(Function(o) o.Y).ToList
                    Dim avgdist As Integer, i As Integer
                    For i = 1 To orderedlist.Count - 1
                        avgdist += (orderedlist(i).Y) - (orderedlist(i - 1).Y + orderedlist(i - 1).Height)
                    Next
                    avgdist /= (orderedlist.Count - 1)
                    For i = 1 To orderedlist.Count - 1
                        orderedlist(i).Y = orderedlist(i - 1).Y + orderedlist(i - 1).Height + avgdist
                    Next
            End Select

            Me.Invalidate()
            Application.DoEvents()
            Me.Invalidate()
            Application.DoEvents()

        End If

    End Sub

    Private Sub DrawSelectionRectangle(ByVal g As Graphics, _
            ByVal selectionRect As Rectangle)

        Dim selectionBrush As New SolidBrush(Color.FromArgb(25, Color.LightSalmon))
        Dim normalizedRectangle As Rectangle

        'make sure the rectangle's upper left point is
        'up and to the left relative to the other points of the rectangle by
        'ensuring that it has a positive width and height.
        normalizedRectangle.Size = selectionRect.Size
        If selectionRect.Width < 0 Then
            normalizedRectangle.X = selectionRect.X - normalizedRectangle.Width
        Else
            normalizedRectangle.X = selectionRect.X
        End If

        If selectionRect.Height < 0 Then
            normalizedRectangle.Y = selectionRect.Y - normalizedRectangle.Height
        Else
            normalizedRectangle.Y = selectionRect.Y
        End If

        g.FillRectangle(selectionBrush, normalizedRectangle)

    End Sub

    Public Overloads Function gscTogoc( _
            ByVal gsPT As Point) As Point
        Dim myNewPoint As New Point
        myNewPoint.X = Convert.ToInt32((gsPT.X - Me.AutoScrollPosition.X) / Me.Zoom)
        myNewPoint.Y = Convert.ToInt32((gsPT.Y - Me.AutoScrollPosition.Y) / Me.Zoom)
        Return myNewPoint
    End Function
    Public Overloads Function gscTogoc( _
            ByVal X As Integer, ByVal Y As Integer) As Point
        Dim myNewPoint As New Point
        myNewPoint.X = Convert.ToInt32((X - Me.AutoScrollPosition.X) / Me.Zoom)
        myNewPoint.Y = Convert.ToInt32((Y - Me.AutoScrollPosition.Y) / Me.Zoom)
        Return myNewPoint
    End Function

    Public Overloads Function gocTogsc( _
            ByVal goPT As Point) As Point
        'note that there is no need for a New for my Point
        'before I can assign values to X and Y
        'as it is a structure not an object
        Dim myNewPoint As New Point
        myNewPoint.X = Convert.ToInt32((goPT.X) * Me.Zoom)
        myNewPoint.Y = Convert.ToInt32((goPT.Y) * Me.Zoom)

        Return myNewPoint
    End Function
    Public Overloads Function gocTogsc( _
            ByVal X As Integer, ByVal Y As Integer) As Point
        Dim myNewPoint As New Point
        myNewPoint.X = Convert.ToInt32(X * Me.Zoom)
        myNewPoint.Y = Convert.ToInt32(Y * Me.Zoom)
        Return myNewPoint
    End Function

    Private Sub GraphicsSurface_MouseClick(ByVal sender As Object, _
            ByVal e As MouseEventArgs) _
            Handles MyBase.MouseDown

        Me.Invalidate()

        Dim mousePT As Point = gscTogoc(e.X, e.Y)

        dragStart = New Point(e.X, e.Y)

        Me.SelectedObject = Me.DrawingObjects.FindObjectAtPoint(mousePT)

        If Not SelectedObject Is Nothing Then Size0 = SelectedObject.GetSize

        If Not ResizingMode Then

            If Me.SelectedObject Is Nothing Then
                Me.SelectedObjects.Clear()
                justselected = False
                If My.Computer.Keyboard.ShiftKeyDown Then
                    draggingfs = True
                End If
            Else
                If My.Computer.Keyboard.CtrlKeyDown Then
                    If Not Me.SelectedObjects.ContainsKey(Me.SelectedObject.Name) Then
                        Me.SelectedObjects.Add(Me.SelectedObject.Name, Me.SelectedObject)
                    Else
                        Me.SelectedObjects.Remove(Me.SelectedObject.Name)
                    End If
                    justselected = True
                Else
                    If Not justselected Then Me.SelectedObjects.Clear()
                    If Not Me.SelectedObjects.ContainsKey(Me.SelectedObject.Name) Then
                        Me.SelectedObjects.Add(Me.SelectedObject.Name, Me.SelectedObject)
                    End If
                    justselected = False
                End If
            End If

            If Not m_SelectedObject Is Nothing Then
                If e.Button And Windows.Forms.MouseButtons.Right Then
                    'rotating = True
                    dragging = True
                    startingRotation = AngleToPoint(m_SelectedObject.GetPosition, mousePT)
                    originalRotation = m_SelectedObject.Rotation
                Else
                    dragging = True
                    dragOffset.X = m_SelectedObject.X - mousePT.X
                    dragOffset.Y = m_SelectedObject.Y - mousePT.Y
                End If
            Else
                If e.Button And Windows.Forms.MouseButtons.Left And Me.SelectRectangle And Not My.Computer.Keyboard.ShiftKeyDown Then
                    selectionDragging = True
                    rectp0.X = mousePT.X * Me.Zoom
                    rectp0.Y = mousePT.Y * Me.Zoom
                    selectionRect.Height = 0
                    selectionRect.Width = 0
                End If
            End If

        Else

            Cursor = Cursors.SizeNWSE

        End If

    End Sub

    Public Sub ZoomAll()

        Dim minx As Integer = 10000
        Dim miny As Integer = 10000
        Dim maxx As Integer = 0
        Dim maxy As Integer = 0

        For Each gobj As GraphicObject In Me.DrawingObjects
            If gobj.ObjectType <> ObjectType.Nenhum Then
                If gobj.X <= minx Then minx = gobj.X
                If gobj.X + gobj.Width >= maxx Then maxx = gobj.X + gobj.Width + 60
                If gobj.Y <= miny Then miny = gobj.Y
                If gobj.Y + gobj.Height >= maxy Then maxy = gobj.Y + gobj.Height + 60
            End If
        Next

        Dim windowheight, windowwidth, fsx, fsy, fsheight, fswidth As Integer

        windowheight = Me.Height
        windowwidth = Me.Width

        fsx = Me.HorizontalScroll.Value
        fsy = Me.VerticalScroll.Value
        fswidth = fsx + windowwidth
        fsheight = fsy + windowheight

        Dim newx, newy As Integer

        newx = minx - 30
        newy = miny - 30

        If newx < 0 Then newx = 0
        If newy < 0 Then newy = 0

        Dim zoomx As Double = 1.0#
        Dim zoomy As Double = 1.0#

        zoomx = windowwidth / (maxx - newx)
        zoomy = windowheight / (maxy - newy)

        If zoomx > zoomy Then Me.Zoom = zoomy Else Me.Zoom = zoomx

        If newx * Me.Zoom < Me.HorizontalScroll.Maximum Then Me.HorizontalScroll.Value = Convert.ToInt32(newx * Me.Zoom)
        If newy * Me.Zoom < Me.VerticalScroll.Maximum Then Me.VerticalScroll.Value = Convert.ToInt32(newy * Me.Zoom)

        Me.Invalidate()

    End Sub

    Public Sub Center()

        Dim minx As Integer = 10000
        Dim miny As Integer = 10000
        Dim maxx As Integer = 0
        Dim maxy As Integer = 0
        Dim middlex, middley As Integer

        For Each gobj As GraphicObject In Me.DrawingObjects
            If gobj.ObjectType <> ObjectType.Nenhum Then
                If gobj.X <= minx Then minx = gobj.X
                If gobj.X + gobj.Width >= maxx Then maxx = gobj.X + gobj.Width + 60
                If gobj.Y <= miny Then miny = gobj.Y
                If gobj.Y + gobj.Height >= maxy Then maxy = gobj.Y + gobj.Height + 60
            End If
        Next

        middlex = (minx + maxx) / 2
        middley = (miny + maxy) / 2



        Me.HorizontalScroll.Value = middlex * Me.Zoom - Me.Width / 2
        Me.VerticalScroll.Value = middley * Me.Zoom - Me.Height / 2

        Me.Invalidate()
        Me.Invalidate()

    End Sub

    Private Sub GraphicsSurface_MouseMove(ByVal sender As Object, _
            ByVal e As MouseEventArgs) Handles MyBase.MouseMove

        Dim dx As Integer = -(e.X - dragStart.X)
        Dim dy As Integer = -(e.Y - dragStart.Y)

        If Not ResizingMode Then

            If draggingfs Then
                If Not My.Computer.Keyboard.ShiftKeyDown Then
                    draggingfs = False
                    Cursor.Current = Cursors.Default
                Else
                    Cursor.Current = Cursors.Hand
                End If


                If Me.HorizontalScroll.Value + dx > Me.HorizontalScroll.Minimum Then
                    Me.HorizontalScroll.Value += dx
                Else
                    Me.HorizontalScroll.Value += Me.HorizontalScroll.Minimum
                End If
                If Me.VerticalScroll.Value + dy > Me.VerticalScroll.Minimum Then
                    Me.VerticalScroll.Value += dy
                Else
                    Me.VerticalScroll.Value += Me.VerticalScroll.Minimum
                End If
                dragStart = New Point(e.X, e.Y)
            Else
                'Cursor.Current = Cursors.Default
                If Not Me.QuickConnect Or Not My.Computer.Keyboard.CtrlKeyDown Then
                    Dim dragPoint As Point = gscTogoc(e.X, e.Y)

                    Dim obj As GraphicObject = Me.DrawingObjects.FindObjectAtPoint(dragPoint)

                    If Not obj Is Nothing Then
                        If obj.ObjectType <> ObjectType.GO_FloatingTable And obj.ObjectType <> ObjectType.GO_Text _
                        And obj.ObjectType <> ObjectType.GO_Image And obj.ObjectType <> ObjectType.GO_Table _
                        And obj.ObjectType <> ObjectType.Nenhum And obj.ObjectType <> ObjectType.GO_SpreadsheetTable _
                        And obj.ObjectType <> ObjectType.GO_MasterTable And obj.ObjectType <> ObjectType.GO_Rectangle Then
                            With Me.hoverRect
                                hoverrotation = obj.Rotation
                                .X = obj.X - 10
                                .Y = obj.Y - 10
                                Select Case obj.ObjectType
                                    Case ObjectType.GO_Animation, ObjectType.GO_Image, ObjectType.GO_Table, ObjectType.GO_FloatingTable, ObjectType.GO_Text, ObjectType.GO_MasterTable, ObjectType.GO_SpreadsheetTable, ObjectType.GO_Rectangle
                                        .Height = obj.Height + 20
                                        .Width = obj.Width + 20
                                    Case Else
                                        .Height = obj.Height + 30
                                        .Width = obj.Width + 20
                                        Dim g As Drawing.Graphics = Drawing.Graphics.FromHwnd(Me.Handle)
                                        Dim strdist As SizeF = g.MeasureString(obj.Tag, New Font("Arial", 10, FontStyle.Regular, GraphicsUnit.Pixel, 0, False), New PointF(0, 0), New StringFormat(StringFormatFlags.NoClip, 0))
                                        If strdist.Width > obj.Width Then
                                            .X = obj.X + (obj.Width - strdist.Width) / 2 - 10
                                            .Width = strdist.Width + 20
                                        End If
                                End Select
                            End With
                            hoverdraw = True
                        End If
                    Else
                        hoverdraw = False
                    End If

                    If Not m_SelectedObject Is Nothing Then

                        If Not m_SelectedObject.IsConnector And SelectRectangle Then

                            If dragging Then

                                Cursor.Current = Cursors.Hand

                                dragPoint.Offset(dragOffset.X, dragOffset.Y)
                                'm_SelectedObject.SetPosition(dragPoint)

                                For Each gr As GraphicObject In Me.SelectedObjects.Values
                                    Dim p As Point = New Point(gr.X, gr.Y)
                                    p.Offset((e.X - dragStart.X) / Me.Zoom, (e.Y - dragStart.Y) / Me.Zoom)
                                    gr.SetPosition(p)
                                Next

                                dragStart = New Point(e.X, e.Y)

                                RaiseEvent StatusUpdate(Me, _
                                    New StatusUpdateEventArgs(StatusUpdateType.ObjectMoved, _
                                        Me.SelectedObject, _
                                        String.Format("Object Moved to {0}, {1}", dragPoint.X, dragPoint.Y), _
                                        dragPoint, 0))

                            ElseIf rotating Then

                                Cursor.Current = Cursors.SizeAll

                                Dim currentRotation As Single

                                currentRotation = _
                                    AngleToPoint(m_SelectedObject.GetPosition, dragPoint)
                                currentRotation = _
                                    Convert.ToInt32((currentRotation - startingRotation + originalRotation) Mod 360)

                                m_SelectedObject.Rotation = currentRotation

                                RaiseEvent StatusUpdate(Me, _
                                    New StatusUpdateEventArgs(StatusUpdateType.ObjectRotated, _
                                            Me.SelectedObject, _
                                            String.Format("Object Rotated to {0} degrees", currentRotation), _
                                            Nothing, currentRotation))


                            Else

                                Cursor.Current = Cursors.Default

                            End If

                        Else

                            Cursor.Current = Cursors.Default

                        End If
                    Else

                        If selectionDragging And SelectRectangle Then

                            Dim x0, y0, x1, y1 As Integer

                            x0 = rectp0.X
                            y0 = rectp0.Y
                            x1 = dragPoint.X * Me.Zoom
                            y1 = dragPoint.Y * Me.Zoom

                            If x1 > x0 Then
                                selectionRect.X = x0
                            Else
                                selectionRect.X = x1
                            End If

                            If y1 > y0 Then
                                selectionRect.Y = y0
                            Else
                                selectionRect.Y = y1
                            End If

                            selectionRect.Width = Math.Abs(x1 - x0)
                            selectionRect.Height = Math.Abs(y1 - y0)

                            Cursor.Current = Cursors.Default

                        Else

                            Cursor.Current = Cursors.Default

                        End If
                    End If

                Else

                    Cursor.Current = Cursors.Default

                End If

            End If

        Else

            If Not Me.SelectedObject Is Nothing And Cursor = Cursors.SizeNWSE Then

                Dim neww, newh As Integer

                If ResizingMode_KeepAR Then
                    neww = Size0.Width - Convert.ToDouble(Size0.Width / Size0.Height) * Math.Min(dx, dy)
                    newh = Size0.Height - Math.Min(dx, dy)
                Else
                    neww = Size0.Width - dx
                    newh = Size0.Height - dy
                End If

                If neww > 10 And newh > 10 Then
                    Me.SelectedObject.Width = neww
                    Me.SelectedObject.Height = newh
                Else
                    Me.SelectedObject.Width = 10
                    Me.SelectedObject.Height = 10
                End If

            End If

            Me.Invalidate()

        End If

    End Sub

    Private Sub GraphicsSurface_MouseUp(ByVal sender As Object, _
            ByVal e As MouseEventArgs) Handles MyBase.MouseUp

        If Not ResizingMode Then

            draggingfs = False

            If dragging And SnapToGrid Then
                Dim horizGridSize As Integer = ConvertToHPixels(GridSize / 100) '* Me.Zoom
                Dim vertGridSize As Integer = ConvertToVPixels(GridSize / 100) '* Me.Zoom
                Dim bounds As Rectangle = ConvertToPixels(SurfaceBounds)
                bounds = ZoomRectangle(bounds)
                Dim oc As Point
                Dim nlh, nlv, snapx, snapy As Integer
                nlh = bounds.Width / horizGridSize
                nlv = bounds.Height / vertGridSize
                For Each go As GraphicObject In Me.SelectedObjects.Values
                    oc = New Point(go.X + go.Width / 2, go.Y + go.Height / 2)
                    snapx = Math.Round(oc.X / horizGridSize) * horizGridSize - go.Width / 2
                    snapy = Math.Round(oc.Y / vertGridSize) * vertGridSize - go.Height / 2
                    go.SetPosition(New Point(snapx, snapy))
                Next
            End If
            dragging = False
            rotating = False
            If selectionDragging Then
                Dim zoomedSelection As Rectangle = DeZoomRectangle(selectionRect)
                Dim graphicObj As GraphicObject
                For Each graphicObj In Me.DrawingObjects
                    If graphicObj.HitTest(zoomedSelection) Then
                        Me.SelectedObject = graphicObj
                        Exit For
                    End If
                Next
                For Each graphicObj In Me.DrawingObjects
                    If graphicObj.HitTest(zoomedSelection) Then
                        If Not Me.SelectedObjects.ContainsKey(graphicObj.Name) Then Me.SelectedObjects.Add(graphicObj.Name, graphicObj)
                    End If
                Next
                selectionDragging = False
                justselected = True
            End If

        Else

            Cursor = Cursors.Default
            Size0 = Nothing

        End If

        Me.Invalidate()

    End Sub

    Protected Overrides Sub OnMouseWheel(ByVal e As System.Windows.Forms.MouseEventArgs)

        If e.Delta <> 0 Then 'has wheel been moved?

            'The .NET docs suggest that e.Delta returns the actual number of notches
            'the mouse wheel has been rotated, but in actuality each roll of the mouse wheel
            'returns a value of +/- 120 (depending on the direction of rotation).
            '120 is actually a system constant, and therefore there is a possibility that it could
            'change to allow for higher-resolution mouse wheels.

            'check out <http://msdn.microsoft.com/library/en-us/winui/winui/windowsuserinterface/userinput/mouseinput/mouseinputreference/mouseinputmessages/wm_mousewheel.asp>
            'for more information

            If My.Computer.Keyboard.CtrlKeyDown Then

                Dim dx, dy As Integer

                Dim Cursorpos, Pos1, Pos2 As Drawing.Point
                Cursorpos = Cursor.Position
                Pos1 = gscTogoc(Cursorpos.X, Cursorpos.Y).ToSDPoint

                'do zoom
                If e.Delta > 0 Then Me.Zoom += 0.05 Else Me.Zoom -= 0.05
                Pos2 = gscTogoc(Cursorpos.X, Cursorpos.Y).ToSDPoint

                dx = Pos1.X - Pos2.X
                dy = Pos1.Y - Pos2.Y

                Try
                    'adjust viewpoint to keep same position
                    Me.HorizontalScroll.Value += dx
                    Me.VerticalScroll.Value += dy
                Catch ex As Exception

                End Try

                RaiseEvent StatusUpdate(Me, New StatusUpdateEventArgs(StatusUpdateType.SurfaceZoomChanged,
                        Me.SelectedObject, String.Format("Zoom set to {0}", Me.Zoom * 100),
                        Nothing, Me.Zoom))

            Else

                Dim detents As Integer = e.Delta / 120

                Dim deltascroll As Integer = 3
                If My.Computer.Mouse.WheelExists Then deltascroll = My.Computer.Mouse.WheelScrollLines

                If detents > 0 Then
                    If Me.VerticalScroll.Value > 4 * deltascroll Then
                        If 4 * deltascroll > Me.VerticalScroll.SmallChange Then
                            Me.VerticalScroll.Value -= 4 * deltascroll
                        End If
                    Else
                        Me.VerticalScroll.Value = 0
                    End If
                ElseIf detents < 0 Then
                    If Me.VerticalScroll.Value > 4 * deltascroll Then
                        If 4 * deltascroll > Me.VerticalScroll.SmallChange Then
                            Me.VerticalScroll.Value += 4 * deltascroll
                        End If
                    Else
                        Me.VerticalScroll.Value = 0
                    End If
                End If

            End If

            Me.Invalidate()

        End If
    End Sub

    'TODO: Rewrite to handle multiple selected objects
    Public Property SelectedObject() As GraphicObject
        Get
            Return m_SelectedObject
        End Get
        Set(ByVal Value As GraphicObject)
            If Not Value Is m_SelectedObject Then
                If m_drawingObjects.Contains(Value) OrElse Value Is Nothing Then
                    m_SelectedObject = Value
                    RaiseEvent SelectionChanged(Me, New SelectionChangedEventArgs(Value))
                    If Value Is Nothing Then
                        RaiseEvent StatusUpdate(Me, _
                            New StatusUpdateEventArgs(StatusUpdateType.SelectionChanged, _
                                Value, "No Object Selected", _
                                Nothing, 0))
                    Else
                        RaiseEvent StatusUpdate(Me, _
                            New StatusUpdateEventArgs(StatusUpdateType.SelectionChanged, _
                                Value, "Selected Object Changed", _
                                Value.GetPosition, 0))
                    End If
                    Me.Invalidate()
                End If
            End If
        End Set
    End Property

    Public ReadOnly Property SelectedObjects() As Generic.Dictionary(Of String, GraphicObject)
        Get
            Return m_SelectedObjects
        End Get
    End Property

    Public Sub DeleteSelectedObject(gobj As GraphicObject)
        Dim objectToDelete As GraphicObject = gobj
        If Not objectToDelete Is Nothing Then
            If Me.DrawingObjects.Contains(objectToDelete) Then
                Me.DrawingObjects.Remove(objectToDelete)
                Me.SelectedObject = Nothing
                Me.Invalidate()
            End If
        End If
    End Sub

    Public Sub DeleteAllObjects()
        Me.DrawingObjects.Clear()
        Me.Invalidate()
    End Sub

    Private Function AngleToPoint(ByVal Origin As Point, _
            ByVal Target As Point) As Single
        'a cool little utility function, 
        'given two points finds the angle between them....
        'forced me to recall my highschool math, 
        'but the task is made easier by a special overload to
        'Atan that takes X,Y co-ordinates.
        Dim Angle As Single
        Target.X = Target.X - Origin.X
        Target.Y = Target.Y - Origin.Y
        Angle = Math.Atan2(Target.Y, Target.X) / (Math.PI / 180)
        Return Angle
    End Function

    Public Sub DrawRoundRect(ByVal g As Graphics, ByVal p As Pen, ByVal x As Integer, ByVal y As Integer, ByVal width As Integer, ByVal height As Integer, ByVal radius As Integer, ByVal myBrush As Brush)

        If width / 2 < radius Then
            radius = width / 2 - 2
        ElseIf height / 2 < radius Then
            radius = height / 2 - 2
        End If

        Dim gp As Drawing2D.GraphicsPath = New Drawing2D.GraphicsPath

        gp.AddLine(x + radius, y, x + width - radius, y)
        gp.AddArc(x + width - radius, y, radius, radius, 270, 90)
        gp.AddLine(x + width, y + radius, x + width, y + height - radius)
        gp.AddArc(x + width - radius, y + height - radius, radius, radius, 0, 90)
        gp.AddLine(x + width - radius, y + height, x + radius, y + height)
        gp.AddArc(x, y + height - radius, radius, radius, 90, 90)
        gp.AddLine(x, y + height - radius, x, y + radius)
        gp.AddArc(x, y, radius, radius, 180, 90)

        gp.CloseFigure()

        g.DrawPath(p, gp)
        g.FillPath(myBrush, gp)

        gp.Dispose()

    End Sub

    Private Sub DrawPropertyListBlock(canvas As Graphics, gobj As GraphicObject)

        If gobj.Owner Is Nothing Then Exit Sub

        Dim gCon As Drawing2D.GraphicsContainer
        gCon = canvas.BeginContainer()
        canvas.ScaleTransform(Zoom, Zoom)

        Dim X, Y, Padding, Height, Width As Double

        Padding = gobj.Owner.GetFlowsheet.FlowsheetOptions.DisplayCornerPropertyListPadding

        X = gobj.X + gobj.Width + 15
        Y = gobj.Y + gobj.Height + 20

        Dim tpaint As New SolidBrush(Color.DimGray)

        Dim bgpaint As New SolidBrush(Color.FromArgb(200, 255, 255, 255))

        Dim tfont As New Font(gobj.Owner.GetFlowsheet.FlowsheetOptions.DisplayCornerPropertyListFontName, gobj.Owner.GetFlowsheet.FlowsheetOptions.DisplayCornerPropertyListFontSize, GraphicsUnit.Pixel)

        If Not gobj.Owner Is Nothing Then

            If gobj.Owner.GetFlowsheet IsNot Nothing Then

                Dim count As Integer

                Dim fs = gobj.Owner.GetFlowsheet
                Dim props As New List(Of String)(fs.FlowsheetOptions.VisibleProperties(gobj.Owner.GetType.Name))
                props.AddRange(DirectCast(gobj.Owner.ExtraProperties, IDictionary(Of String, Object)).Keys.ToArray)

                If gobj.Owner.GraphicObject.ObjectType = DWSIM.Interfaces.Enums.GraphicObjects.ObjectType.CapeOpenUO Then props = gobj.Owner.GetProperties(Interfaces.Enums.PropertyType.ALL).ToList

                Dim propstoremove As New List(Of String)

                If gobj.Owner.GraphicObject.ObjectType = DWSIM.Interfaces.Enums.GraphicObjects.ObjectType.MaterialStream Then
                    For Each p In props
                        If gobj.Owner.GetPropertyValue(p).Equals(Double.MinValue) Then
                            propstoremove.Add(p)
                        End If
                    Next
                    For i As Integer = 0 To propstoremove.Count - 1
                        props.Remove(propstoremove(i))
                    Next
                End If

                count = props.Count

                Dim fsize = canvas.MeasureString("MEASURE", tfont)

                Height = (count - 1) * (fsize.Height + Padding) + Padding

                Dim propstring, propval, propunit, text As String
                Dim pval0 As Object = Nothing

                Dim texts As New List(Of String)

                Dim n As Integer = 1
                For Each prop In props
                    propstring = gobj.Owner.GetFlowsheet.GetTranslatedString(prop)
                    pval0 = gobj.Owner.GetPropertyValue(prop, gobj.Owner.GetFlowsheet.FlowsheetOptions.SelectedUnitSystem)
                    If pval0 Is Nothing Then Exit For
                    If TypeOf pval0 Is Double Then
                        propval = Convert.ToDouble(pval0).ToString(gobj.Owner.GetFlowsheet.FlowsheetOptions.NumberFormat)
                    Else
                        propval = pval0.ToString
                    End If
                    propunit = gobj.Owner.GetPropertyUnit(prop, gobj.Owner.GetFlowsheet.FlowsheetOptions.SelectedUnitSystem)
                    text = propstring + ": " + propval + " " + propunit
                    If canvas.MeasureString(text, tfont).Width > Width Then Width = canvas.MeasureString(text, tfont).Width
                    texts.Add(text)
                    n += 1
                Next

                canvas.FillRectangle(bgpaint, Convert.ToInt32(X), Convert.ToInt32(Y + Padding), Convert.ToInt32(Width), Convert.ToInt32(Height + Padding))

                n = 0
                For Each text In texts
                    canvas.DrawString(text, tfont, tpaint, X, Y + n * (fsize.Height + Padding))
                    n += 1
                Next

                props.Clear()
                props = Nothing

            End If

        End If

        canvas.EndContainer(gCon)

    End Sub


End Class