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How to create Paint tool in VB .Net

 
   I must mention that in this application I did not use images saved on the disk but matrixes that represent
the pixels of the image, follow the code and you will understand how this technique work.
You could download the whole project here   Download this project
  Let's create a project for example with the name dzoDraw !
We insert the first form that contains the three menus and the space for drawing and other tabulated windows.
In this form we insert the four panels
  • Menu Panel
  • ToolBar Panel
  • Draw Panel
  • Properties Panel
  •  
    How to create Paint tool in VB .Net
     

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    Let we start with Draw Panel

     
    We need the most important structure in the project that allows you to create the various drawing objects DZODraw
    using the class DZODraw
    
    	 Public Structure ptObject
    		Public name As String                    - name of the drawn object
    		Public X1 As Point                       - the left corner position
    		Public X2 As Point                       - the right corner position
    		Public XORIG1 As Point                   - the original position of left corner position
    		Public XORIG2 As Point                   - the original position of right corner position
    		Public penLine As Pen                    - the Pen using for the drawing of the object
    		Public draw As Integer  
    	 
    

     

    The variable draw can be one of the following value:

     
     
    		Public Const CLEAR = 0  	        - to clear the drawing area
    		Public Const LINE = 1   	        - to draw line
    		Public Const LINEARROW = 2 	        - to draw line with one arrow 
    		Public Const LINEARROWSE = 3 	   	- to draw line with two arrows 
    		Public Const PEN = 4  		    	- to draw with the pen
    		Public Const RECTANGLE = 5 	        - to draw rectangle
    		Public Const CUBE = 6   	        - to draw cube
    		Public Const ELLIPSE = 7                - to drwa ellipse
    		Public Const CURVE = 8                  - to draw curve
    		Public Const BOLT = 9                   - to draw bolt
    		Public Const FILL = 10                  - to fill area with color
    		Public Const SELECTION = 11             - to select object
    		Public Const COPY = 12                  - to copy the selected object
    		Public Const PASTE = 13                 - to past the selected object
    		Public Const DELETE = 14                - to delete the selected object
    		Public Const IIMAGE = 15                - to insert image from disk
    		Public Const LABEL = 16                 - to insert text 
    		Public Const GRID = 17                  - to view the grid in the drawing area
    		Public Const ZOOM_M = 18                - to zoom -
    		Public Const ZOOM_P = 19                - to zoom +
    		Public Const EXIT_APP = 20              - to exit from the application
    		Public bitmap As Bitmap                 - the bitmap if the object need 
    		Public text As String                   - the text if the object is a text
    		Public directionText As String          - the direction of the text horizontal or vertical
    		Public lstPtCurve As ArrayList          - the list of points that form the curved object
    		Public font As Font                     - the font used when the object is a text
    		Public rotation As Integer              - the rotation angle of the object 
    		Public penSize As Single                - the size of the drawing pen 
    		Public penStyle As String               - the style of the drawing pen 
    		Public FillColor As Color               - the first fill color 
    		Public FillColor2 As Color              - the second fill color to combine with the first
    		Public ForeColor As Color               - the color of the drawing pen
    		Public bringToFront As Boolean          - to bring the object to back or to front.
    		Public brightness As Double             - the brightness of the image if the object is a bitmap.
    		Public contrast As Double               - the contrast of the image if the object is a bitmap.
    		Public gamma As Double                  - the gamma  of the image if the object is a bitmap.
    		Public orderDesign As Integer           - the order of drawing of the object
    		Public brushBitmap As String            - the brushBitmap of the image if the object is a bitmap.
    		Public dCube As Integer                 - the depth of the cube object.
    	End Structure
    	Public Class DZODraw
        ...
     
    

    these the most important lists used:
    		Public lstDrawOject As New List(Of ptObject)      - List of all drawn objects
    		Public lstRedoDrawOject As New List(Of ptObject)  - List of deleted objects witch can be recovered with Ctrl+Z
    		Public lstSelDrawOject As New List(Of ptObject)   - List of all selected  objects
    		Public lstCopiedSelDrawOject As New ArrayList()   - List of all copied objects
    	   .....  
    	   ....
    	End class
     
    

    Therefore we have an object that is manipulated through lists
    let's start by explaining the various methods (DZODraw class)
    ' Draw Line with the selected style from properties
      
      
    	Private Sub DrawLine(pt As ptObject)
    		Dim brushFore As New SolidBrush(pt.ForeColor)
    		Dim penDraw As New Pen(brushFore, pt.penSize)
    		Select Case pt.penStyle
    			Case Principal.SOLID_STYLE
    				penDraw.DashStyle = DashStyle.Solid
    			Case Principal.DASH_STYLE
    				penDraw.DashStyle = DashStyle.Dash
    			Case Principal.DOT_STYLE
    				penDraw.DashStyle = DashStyle.Dot
    			Case Principal.DASDOT_STYLE
    				penDraw.DashStyle = DashStyle.DashDot
    		End Select
    		g.DrawLine(penDraw, pt.X1, pt.X2)  
    	End Sub
    
    	Private Sub DrawArrow(pt As ptObject, arrowStart As Boolean)
    		Dim brushFore As New SolidBrush(pt.ForeColor)
    		Dim penDraw As New Pen(brushFore, pt.penSize)
    		Select Case pt.penStyle
    			Case Principal.SOLID_STYLE
    				penDraw.DashStyle = DashStyle.Solid
    			Case Principal.DASH_STYLE
    				penDraw.DashStyle = DashStyle.Dash
    			Case Principal.DOT_STYLE
    				penDraw.DashStyle = DashStyle.Dot
    			Case Principal.DASDOT_STYLE
    				penDraw.DashStyle = DashStyle.DashDot
    		End Select
    		If arrowStart Then
    			drawLineArrow.ArrowEnd(g, pt, penDraw.DashStyle)
    		Else
    			drawLineArrow.ArrowStartEnd(g, pt, penDraw.DashStyle)
    		End If
    	End Sub
     
    

    Where drawLineArrow is a Type of Arrow ( see class Arrow)
    We do the same thing to draw an ellipse, rectangle , bolt, text, cube usign the selected style
    of the pen and the selected brush for the colors filling.
    	Private Sub DrawEllipse(pt As ptObject)
    			Dim oBmp As Bitmap
    			Dim oBrushTexture As TextureBrush
    			Dim brushFore As New SolidBrush(pt.ForeColor)
    			Dim penDraw As New Pen(brushFore, pt.penSize)
    			Dim brushFill As New LinearGradientBrush(pt.X1, pt.X2, pt.FillColor, pt.FillColor2)
    			Select Case pt.penStyle
    				Case Principal.SOLID_STYLE
    					penDraw.DashStyle = DashStyle.Solid
    				Case Principal.DASH_STYLE
    					penDraw.DashStyle = DashStyle.Dash
    				Case Principal.DOT_STYLE
    					penDraw.DashStyle = DashStyle.Dot
    				Case Principal.DASDOT_STYLE
    					penDraw.DashStyle = DashStyle.DashDot
    			End Select
    			g.DrawEllipse(penDraw, New Rectangle(pt.X1, New Size(pt.X2.X - pt.X1.X, pt.X2.Y - pt.X1.Y)))
    			If pt.brushBitmap <> Nothing Then
    				oBmp = New Bitmap(CStr(pt.brushBitmap))
    				oBrushTexture = New TextureBrush(oBmp)
    				g.FillEllipse(oBrushTexture, pt.X1.X + 1, pt.X1.Y + 1, (pt.X2.X - pt.X1.X) - 1, 
    				(pt.X2.Y - pt.X1.Y) - 1)
    			Else
    				g.FillEllipse(brushFill, pt.X1.X + 1, pt.X1.Y + 1, (pt.X2.X - pt.X1.X) - 1, 
    				(pt.X2.Y - pt.X1.Y) - 1)
    			End If
    	End Sub
    
    	Private Sub DrawRectangle(pt As ptObject)
    			Dim oBmp As Bitmap
    			Dim oBrushTexture As TextureBrush
    			Dim brushFore As New SolidBrush(pt.ForeColor)
    			Dim penDraw As New Pen(brushFore, pt.penSize)
    			Dim brushFill As New LinearGradientBrush(pt.X1, pt.X2, pt.FillColor, pt.FillColor2)
    			Select Case pt.penStyle
    				Case Principal.SOLID_STYLE
    					penDraw.DashStyle = DashStyle.Solid
    				Case Principal.DASH_STYLE
    					penDraw.DashStyle = DashStyle.Dash
    				Case Principal.DOT_STYLE
    					penDraw.DashStyle = DashStyle.Dot
    				Case Principal.DASDOT_STYLE
    					penDraw.DashStyle = DashStyle.DashDot
    			End Select
    			g.DrawRectangle(penDraw, New Rectangle(pt.X1, New Size(pt.X2.X - pt.X1.X, pt.X2.Y - pt.X1.Y)))
    			If pt.brushBitmap <> Nothing Then
    				oBmp = New Bitmap(pt.brushBitmap)
    				oBrushTexture = New TextureBrush(oBmp)
    				g.FillRectangle(oBrushTexture, pt.X1.X + 1, pt.X1.Y + 1, (pt.X2.X - pt.X1.X) - 1, 
    				(pt.X2.Y - pt.X1.Y) - 1)
    			Else
    				g.FillRectangle(brushFill, pt.X1.X + 1, pt.X1.Y + 1, (pt.X2.X - pt.X1.X) - 1, 
    				(pt.X2.Y - pt.X1.Y) - 1)
    			End If
    		End Sub
    		Private Sub DrawBOLT(pt As ptObject)
    			If pt.brushBitmap Is Nothing Then
    				DrawBOLTWithoutTexture(pt) 
    			Else
    				DrawBOLTWithTexture(pt)
    			End If
    	End Sub
    
    	Private Sub DrawBOLTWithTexture(pt As ptObject)
    			Dim oBmp As Bitmap
    			Dim oBrushTexture As TextureBrush
    			Dim brushFore As New SolidBrush(pt.ForeColor)
    			Dim penDraw As New Pen(brushFore, pt.penSize)
    			Dim brushFill As New LinearGradientBrush(pt.X1, pt.X2, pt.FillColor, pt.FillColor2)
    			If pt.brushBitmap = "" Then
    				DrawBOLTWithoutTexture(pt)
    				Return
    			End If
    			oBmp = New Bitmap(pt.brushBitmap)
    			oBrushTexture = New TextureBrush(oBmp)
    			Select Case pt.penStyle
    				Case Principal.SOLID_STYLE
    					penDraw.DashStyle = DashStyle.Solid
    				Case Principal.DASH_STYLE
    					penDraw.DashStyle = DashStyle.Dash
    				Case Principal.DOT_STYLE
    					penDraw.DashStyle = DashStyle.Dot
    				Case Principal.DASDOT_STYLE
    					penDraw.DashStyle = DashStyle.DashDot
    			End Select
    			Dim d As Integer = CInt((pt.X2.X - pt.X1.X) / 3)
    			Dim bl As New GraphicsPath()
    			bl.AddEllipse(pt.X1.X + CInt((pt.X2.X - pt.X1.X) / 2) - CInt(d / 2), pt.X1.Y + 
    			CInt((pt.X2.Y - pt.X1.Y) / 2) - CInt(d / 2), d, d)
    			bl.StartFigure()
    			bl.AddLine(pt.X1.X, pt.X1.Y, pt.X1.X, pt.X2.Y)
    			bl.AddLine(pt.X2.X, pt.X1.Y, pt.X2.X, pt.X2.Y)
    			bl.AddLine(pt.X1.X, pt.X1.Y, pt.X1.X + CInt((pt.X2.X - pt.X1.X) / 2), pt.X1.Y - 
    			CInt((pt.X2.Y - pt.X1.Y) / 2))
    			bl.AddLine(pt.X1.X + CInt((pt.X2.X - pt.X1.X) / 2), pt.X1.Y - CInt((pt.X2.Y -
    			pt.X1.Y) / 2), pt.X2.X, pt.X1.Y)
    			bl.AddLine(pt.X1.X, pt.X2.Y, pt.X1.X + CInt((pt.X2.X - pt.X1.X) / 2), pt.X2.Y 
    			+ CInt((pt.X2.Y - pt.X1.Y) / 2))
    			bl.AddLine(pt.X1.X + CInt((pt.X2.X - pt.X1.X) / 2), pt.X2.Y + CInt((pt.X2.Y - pt.X1.Y) / 2),
    			pt.X2.X, pt.X2.Y)
    			g.DrawPath(penDraw, bl)
    			g.FillPath(oBrushTexture, bl)
    			bl.Reset()
    			bl.AddEllipse(pt.X1.X + CInt((pt.X2.X - pt.X1.X) / 2) - CInt(d / 2), pt.X1.Y +
    			CInt((pt.X2.Y - pt.X1.Y) / 2) - CInt(d / 2), d, d)
    			g.DrawPath(penDraw, bl)
    			g.FillPath(brushFill, bl)
    	End Sub
    
    	Private Sub DrawBOLTWithoutTexture(pt As ptObject)
    			Dim brushFore As New SolidBrush(pt.ForeColor)
    			Dim penDraw As New Pen(brushFore, pt.penSize)
    			Dim brushFill As New LinearGradientBrush(pt.X1, pt.X2, pt.FillColor, pt.FillColor2)
    			Select Case pt.penStyle
    				Case Principal.SOLID_STYLE
    					penDraw.DashStyle = DashStyle.Solid
    				Case Principal.DASH_STYLE
    					penDraw.DashStyle = DashStyle.Dash
    				Case Principal.DOT_STYLE
    					penDraw.DashStyle = DashStyle.Dot
    				Case Principal.DASDOT_STYLE
    					penDraw.DashStyle = DashStyle.DashDot
    			End Select
    			Dim d As Integer = CInt((pt.X2.X - pt.X1.X) / 3)
    			Dim bl As New GraphicsPath()
    			bl.AddEllipse(pt.X1.X + CInt((pt.X2.X - pt.X1.X) / 2) - CInt(d / 2), pt.X1.Y + 
    			CInt((pt.X2.Y - pt.X1.Y) / 2) - CInt(d / 2), d, d)
    			bl.StartFigure()
    			bl.AddLine(pt.X1.X, pt.X1.Y, pt.X1.X, pt.X2.Y)
    			bl.StartFigure()
    			bl.AddLine(pt.X2.X, pt.X1.Y, pt.X2.X, pt.X2.Y)
    			bl.StartFigure()
    			bl.AddLine(pt.X1.X, pt.X1.Y, pt.X1.X + CInt((pt.X2.X - pt.X1.X) / 2), pt.X1.Y - 
    			CInt((pt.X2.Y - pt.X1.Y) / 2))
    			bl.StartFigure()
    			bl.AddLine(pt.X1.X + CInt((pt.X2.X - pt.X1.X) / 2), pt.X1.Y -
    			CInt((pt.X2.Y - pt.X1.Y) / 2), pt.X2.X, pt.X1.Y)
    			bl.StartFigure()
    			bl.AddLine(pt.X1.X, pt.X2.Y, pt.X1.X + CInt((pt.X2.X - pt.X1.X) / 2), pt.X2.Y +
    			CInt((pt.X2.Y - pt.X1.Y) / 2))
    			bl.StartFigure()
    			bl.AddLine(pt.X1.X + CInt((pt.X2.X - pt.X1.X) / 2), pt.X2.Y + CInt((pt.X2.Y - pt.X1.Y) / 2),
    			pt.X2.X, pt.X2.Y)
    			g.DrawPath(penDraw, bl)
    			g.FillPath(brushFill, bl)
    			g.ResetTransform()
    	End Sub
    
    	Private Sub DrawLabel(pt As ptObject)
    			Dim oBmp As Bitmap
    			Dim brush As LinearGradientBrush
    			Dim oBrusht As TextureBrush
    			If pt.brushBitmap <> Nothing Then
    				oBmp = New Bitmap(CStr(pt.brushBitmap))
    				oBrusht = New TextureBrush(oBmp)
    				If (pt.directionText = "Vertical") Then
    					Dim strf As StringFormat = New StringFormat(StringFormatFlags.DirectionVertical)
    					g.DrawString(pt.text, pt.font, oBrusht, pt.X1.X, pt.X1.Y, strf)
    				Else
    					g.DrawString(pt.text, pt.font, oBrusht, pt.X1.X, pt.X1.Y)
    				End If
    			Else
    				brush = New LinearGradientBrush(pt.X1, pt.X2, pt.FillColor, pt.FillColor2)
    				If (pt.directionText = "Vertical") Then
    					Dim strf As StringFormat = New StringFormat(StringFormatFlags.DirectionVertical)
    					g.DrawString(pt.text, pt.font, brush, pt.X1.X, pt.X1.Y, strf)
    				Else
    					g.DrawString(pt.text, pt.font, brush, pt.X1.X, pt.X1.Y)
    				End If
    			End If
    	End Sub
    
    	Private Sub DrawCUBE(pt As ptObject)
    			Dim oBmp As Bitmap
    			Dim oBrushTexture As TextureBrush
    			Dim brushFore As New SolidBrush(pt.ForeColor)
    			Dim penDraw As New Pen(brushFore, pt.penSize)
    			Dim brushFill As New LinearGradientBrush(pt.X1, pt.X2, pt.FillColor, pt.FillColor2)
    			Select Case pt.penStyle
    				Case Principal.SOLID_STYLE
    					penDraw.DashStyle = DashStyle.Solid
    				Case Principal.DASH_STYLE
    					penDraw.DashStyle = DashStyle.Dash
    				Case Principal.DOT_STYLE
    					penDraw.DashStyle = DashStyle.Dot
    				Case Principal.DASDOT_STYLE
    					penDraw.DashStyle = DashStyle.DashDot
    			End Select
    			g.DrawRectangle(penDraw, New Rectangle(pt.X1, New Size(pt.X2.X - pt.X1.X, pt.X2.Y - pt.X1.Y)))
    			g.DrawRectangle(penDraw, New Rectangle(New Point(pt.X1.X + pt.dCube, pt.X1.Y - pt.dCube), 
    			New Size((pt.X2.X + pt.dCube) -
    			(pt.X1.X + pt.dCube), ((pt.X2.Y - pt.dCube) - (pt.X1.Y - pt.dCube)))))
    			g.DrawLine(penDraw, pt.X1.X, pt.X1.Y, pt.X1.X + pt.dCube, pt.X1.Y - pt.dCube)
    			g.DrawLine(penDraw, pt.X1.X, pt.X2.Y, pt.X1.X + pt.dCube, pt.X2.Y - pt.dCube)
    			g.DrawLine(penDraw, pt.X2.X, pt.X2.Y, pt.X2.X + pt.dCube, pt.X2.Y - pt.dCube)
    			g.DrawLine(penDraw, pt.X2.X, pt.X1.Y, pt.X2.X + pt.dCube, pt.X1.Y - pt.dCube)
    			If pt.brushBitmap <> Nothing Then
    				oBmp = New Bitmap(pt.brushBitmap)
    				oBrushTexture = New TextureBrush(oBmp)
    				g.FillRectangle(oBrushTexture, pt.X1.X + 1, pt.X1.Y + 1, (pt.X2.X - pt.X1.X) - 1, 
    				(pt.X2.Y - pt.X1.Y) - 1)
    			Else
    				g.FillRectangle(brushFill, pt.X1.X + 1, pt.X1.Y + 1, (pt.X2.X - pt.X1.X) - 1, 
    				(pt.X2.Y - pt.X1.Y) - 1)
    			End If
    
    	End Sub
    
     
    

    In order to show the position of the mouse cursor ( currentMouseX and currentMouseY) , we need a function like this
    	Private Sub drawPosition()
    			Dim penPosition As New Pen(Principal._designSettings.DesignForeColor)
    			Dim brsFill As New SolidBrush(Principal._designSettings.DesignForeColor)
    			Dim brsString As New SolidBrush(source._designSettings.DesignBackColor)
    			Dim fnt As New Font("Arial", 8)
    			g.DrawRectangle(penPosition, CurrentMouseX - 1, CurrentMouseY + 20, 50, 20)
    			g.FillRectangle(brsFill, New Rectangle(CurrentMouseX, CurrentMouseY + 21, 49, 19))
    			g.DrawString(Str(CurrentMouseX) & "," & CStr(CurrentMouseY), fnt, brsString, 
    			New PointF(CurrentMouseX, CurrentMouseY + 23))
    
    	End Sub
     
    

    The Principal._designSettings.DesignForeColor is the color used to draw the string and saved
    before by yhe user in the application setting ( properties menu)
    instead source._designSettings.DesignBackColor is the background color of the drawing area
    ( drawPan see the first figure )
     
    How to create Paint tool in VB .Net
     
    The following function allows you to insert an image with the selected brightness, contrast and gamma .
    	Public Function AdjustImage(original As Bitmap, Optional brightness As Double = 1.0F,
    					Optional contrast As Double = 1.0F, Optional gamma As Double = 1.0F) As Bitmap
    	 Dim adjustedImage = New Bitmap(original.Width, original.Height)
    	 Dim adjustedBrightness As Double = brightness - 1.0F
    	 Dim cMatrix As New ColorMatrix(New Single()() _
    				 {
    				 New Single() {contrast, 0, 0, 0, 0},
    				 New Single() {0, contrast, 0, 0, 0},
    				 New Single() {0, 0, contrast, 0, 0},
    				 New Single() {0, 0, 0, 1.0F, 0},
    				 New Single() {adjustedBrightness, adjustedBrightness, adjustedBrightness, 0, 1}})
    	 Dim ia As New ImageAttributes()
    	 ia.ClearColorMatrix()
    	 ia.SetColorMatrix(cMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap)
    	 ia.SetGamma(gamma, ColorAdjustType.Bitmap)
    	 Dim g As Graphics = Graphics.FromImage(adjustedImage)
    	 g.DrawImage(original, New Rectangle(Point.Empty, adjustedImage.Size), 0, 0, original.Width, 
    	 original.Height, GraphicsUnit.Pixel, ia)
    	 Return adjustedImage
    	End Function
    
    	Private Sub DDrawImage(ByRef pt As ptObject)
    	 pt.bitmap = AdjustImage(pt.bitmap, pt.brightness, pt.contrast, pt.gamma)
    	 g.DrawImage(pt.bitmap, pt.X1.X, pt.X1.Y, pt.X2.X - pt.X1.X, pt.X2.Y - pt.X1.Y)
    	End Sub
    
     
    

    Now I try to explain the general function which calls all the above sub-functions and this function
    is called when mouse events are raised like the event mouse_move , mouse_up, ....
    	Public Sub Draw()
            On Error Go to log
            Dim oBmp As Bitmap
            Dim oBrushTexture As TextureBrush
            g = Graphics.FromImage(bm)
            g.Transform = gmatrix
            g.Clear(source._designSettings.DesignBackColor)
            lstDrawOject = lstDrawOject.Cast(Of ptObject)() _
            .OrderBy(Function(i As ptObject) Convert.ToBoolean(i.bringToFront)) _
            .ToList()
            lstSelDrawOject = lstSelDrawOject.Cast(Of ptObject)() _
            .OrderBy(Function(i As ptObject) Convert.ToBoolean(i.bringToFront)) _
            .ToList()
            If source.nMode = Principal.DELETE Then   ' If the user want remove object , 
    													I switch to selection mode and 
    													I remove the selected object 
    													from the list of the drawn objetcs
                source.nMode = Principal.SELECTION    ' and I put them in the list of deleted 
    													objects because the objects can be 
    													recovered with Ctrl+Z
                For Each ptSel In lstSelDrawOject
                    For Each ptO In lstDrawOject
                        If (ptO.name = ptSel.name) Then
                            lstDrawOject.Remove(ptO)
                            lstRedoDrawOject.Add(ptO)
                            Exit For
                        End If
                    Next
                Next
                lstSelDrawOject.Clear()
            End If
            For Each pt In lstDrawOject
                If (pt.rotation <> 0 And pt.draw <> Principal.IIMAGE) Then ' If the property rotation have
    				'a value I apply the rotation of the object 
                    g.RotateTransform(pt.rotation)
                End If
                Select Case pt.draw  ' Now we call the specific drawing function switch the 
    								   selected function in the tool bar
                    Case Principal.LINE
                        DrawLine(pt)
                    Case Principal.LINEARROW
                        DrawArrow(pt, True)
                    Case Principal.LINEARROWSE
                        DrawArrow(pt, False)
                    Case Principal.PEN
                        DrawPen(pt)
                    Case Principal.RECTANGLE
                        DrawRectangle(pt)
                    Case Principal.CUBE
                        DrawCUBE(pt)
                    Case Principal.CURVE
                        DrawCurve(pt)
                    Case Principal.ELLIPSE
                        DrawEllipse(pt)
                    Case Principal.BOLT
                        DrawBOLT(pt)
                    Case Principal.IIMAGE
                        If (pt.rotation = 0) Then
                            DDrawImage(pt)
                        Else
                            drawImageRot(pt)
                        End If
                    Case Principal.LABEL  ' Draw the string written in the object property.
                        DrawLabel(pt)   
                End Select
                If (pt.rotation <> 0) Then
                    g.ResetTransform()
                End If
            Next
            For Each pt In lstTempDrawOject ' This list is temporary and allows you to draw objects 
    										' when we are still drawing or
    										' moving the objects.
                If (pt.rotation <> 0 And pt.draw <> Principal.IIMAGE) Then
                    g.RotateTransform(pt.rotation)
                End If
                Select Case pt.draw
                    Case Principal.LINE
                        DrawLine(pt)
                    Case Principal.LINEARROW
                        DrawArrow(pt, True)
                    Case Principal.LINEARROWSE
                        DrawArrow(pt, False)
                    Case Principal.RECTANGLE
                        DrawRectangle(pt)
                    Case Principal.CUBE
                        DrawCUBE(pt)
                    Case Principal.ELLIPSE
                        DrawEllipse(pt)
                    Case Principal.BOLT
                        DrawBOLT(pt)
                    Case Principal.IIMAGE
                        If (pt.rotation = 0) Then
                            DDrawImage(pt)
                        Else
                            drawImageRot(pt)
                        End If
                End Select
                If (pt.rotation <> 0) Then
                    g.ResetTransform()
                End If
            Next
            For Each pt In lstSelDrawOject ' Here I draw the selected objects. 
                If (pt.rotation <> 0 And pt.draw <> Principal.IIMAGE) Then
                    g.RotateTransform(pt.rotation)
                End If
                Select Case pt.draw
                    Case Principal.LINE
                        DrawLine(pt)
                    Case Principal.LINEARROW
                        DrawArrow(pt, True)
                    Case Principal.LINEARROWSE
                        DrawArrow(pt, False)
                    Case Principal.PEN
                        DrawPen(pt)
                    Case Principal.RECTANGLE
                        DrawRectangle(pt)
                    Case Principal.CUBE
                        DrawCUBE(pt)
                    Case Principal.CURVE
                        DrawCurve(pt)
                        calcolaMinMaxCurve(pt)
                    Case Principal.ELLIPSE
                        DrawEllipse(pt)
                    Case Principal.BOLT
                        DrawBOLT(pt)
                    Case Principal.IIMAGE
                        If (pt.rotation = 0) Then
                            DDrawImage(pt)
                        Else
                            drawImageRot(pt)
                        End If
                    Case Principal.LABEL
                        DrawLabel(pt)
                End Select
                If (pt.rotation <> 0) Then
                    g.ResetTransform()
                End If
                DrawCursor(g, pt)
            Next
            If (lstCurveDrawOject.Count <> 0) Then ' In this case I draw all the lines for each  
    			' curve object in the list.
                Dim penLine As New Pen(source._designSettings.DesignForeColor)
                penLine.MiterLimit = 0
                Dim ptCurve As New List(Of Drawing.PointF)
                Dim fd As Boolean
                For Each ptC In lstCurveDrawOject
                    fd = False
                    For Each p In ptCurve
                        If p.X = ptC.X And p.Y = ptC.Y Then
                            fd = True
                        End If
                    Next
                    If Not fd Then
                        ptCurve.Add(ptC)
                    End If
                Next
                If (ptCurve.Count > 1) Then
    
                    g.DrawLines(penLine, ptCurve.ToArray())
                    Dim PC(ptCurve.Count) As PointF
                    For i = 0 To ptCurve.Count - 1
                        PC(i) = ptCurve(i)
                    Next
                    If source._designSettings.DesignBitmap <> Nothing Then
                        oBmp = New Bitmap(CStr(source._designSettings.DesignBitmap))
                        oBrushTexture = New TextureBrush(oBmp)
                        g.FillPolygon(oBrushTexture, PC)
                    Else
                        Dim brushFill As New LinearGradientBrush(PC(0), PC(ptCurve.Count - 1), 
    					source._designSettings.DesignFillColor, 
    					source._designSettings.DesignFillColor2)
                        g.FillPolygon(brushFill, PC)
                    End If
                End If
                ptCurve = Nothing
                penLine = Nothing
            End If
            lstTempDrawOject.Clear()
            If source.nMode = Principal.FILL And ptFill <> Nothing Then
                Dim pt As ptObject
                pt = GetObjPointToFill(ptFill)   ' When I'm in the fill mode I search the object 
    											 ' where I apply the fill color. 
                Dim brsFill As New LinearGradientBrush(pt.X1, pt.X2, source._designSettings.DesignFillColor, 
    			source._designSettings.DesignFillColor2)
                If (pt.name <> Nothing) Then
                    Select Case pt.draw
                        Case Principal.RECTANGLE
                            g.FillRectangle(brsFill, pt.X1.X + 1, pt.X1.Y + 1, (pt.X2.X - pt.X1.X) - 1, 
    						(pt.X2.Y - pt.X1.Y - 1))
                        Case Principal.CUBE
                            g.FillRectangle(brsFill, pt.X1.X + 1, pt.X1.Y + 1, (pt.X2.X - pt.X1.X) - 1,
    						(pt.X2.Y - pt.X1.Y - 1))
                            g.FillRectangle(brsFill, New Rectangle(New Point(pt.X1.X + pt.dCube + 1,
    						pt.X1.Y - (pt.dCube - 1)), 
    						New Size((pt.X2.X + pt.dCube + 1) - (pt.X1.X + pt.dCube + 1), 
    						((pt.X2.Y - (pt.dCube - 1)) - 
    						(pt.X1.Y - (pt.dCube - 1))))))
                        Case Principal.ELLIPSE
                            g.FillEllipse(brsFill, pt.X1.X + 1, pt.X1.Y + 1, (pt.X2.X - pt.X1.X) - 1, 
    						(pt.X2.Y - pt.X1.Y - 1))
                        Case Principal.CURVE
                            Dim P(pt.lstPtCurve.Count) As PointF
                            For i = 0 To pt.lstPtCurve.Count - 1
                                P(i) = pt.lstPtCurve(i)
                            Next
                            g.FillPolygon(brsFill, P)
                    End Select
                    lstDrawOject.Remove(pt)
                    pt.FillColor = source._designSettings.DesignFillColor
                    pt.FillColor2 = source._designSettings.DesignFillColor2
                    pt.brushBitmap = source._designSettings.DesignBitmap
                    lstDrawOject.Add(pt)
                End If
                ptFill = Nothing
            End If
            If Principal.SELECTION And bMouseDown And ptSelAll <> Nothing Then
                DrawCursorAll(g)
            End If
            If (source.bGrid) Then
                DrawGrid(g)
            End If
    
            If bMouseDown Then
                drawPosition()
            End If
            source.DrawPan.CreateGraphics().DrawImage(bm, New Point(source.DrawPan.AutoScrollPosition.X, 
    		source.DrawPan.AutoScrollPosition.Y)) 
    		' Draw the objects in the draw panel.
    		exit sub
    	log:
          Debug.Print(err.Description)
       End Sub
    
     
    

    Now let's see how the function draw is called.
     

    Event MouseDown

    	Public Sub MouseDown(sender As Object, e As MouseEventArgs) 
    			If (e.Button = MouseButtons.Left) Then
    				If (poMenu.isVisible) Then
    					Dim op As ptObject = poMenu.DestroyPopupMenu()
    					If (op.name IsNot Nothing) Then
    						lstSelDrawOject.Clear()
    						If op.draw = Principal.LABEL Then
    							If op.directionText = "Vertical" Then
    								op.X2.X = op.X1.X + op.font.GetHeight() * 3 / 2
    							Else
    								op.X2.X = op.X1.X + MeasureDisplayStringWidth(op.text, op.font) + 10
    							End If
    						End If
    						lstSelDrawOject.Add(op)
    						Draw()
    					End If
    				End If
    				bMouseDown = True
    				If (source.nMode = Principal.ZOOM_M Or source.nMode = Principal.ZOOM_P) Then
    					ctrlKey = True
    				End If
    				HscrollX = source.DrawPan.HorizontalScroll.Value
    				VscrollY = source.DrawPan.VerticalScroll.Value
    				oldLocation.Y = 0
    				oldLocation.X = 0
    				lstDrawOject = lstDrawOject.Cast(Of ptObject)().OrderBy(Function(i As ptObject) 
    				Convert.ToBoolean(Not i.bringToFront)).ToList()
    				If (source.nMode = Principal.SELECTION) Then
    					If (lstSelDrawOject.Count = 1) Then
    						Dim p As ptObject = lstSelDrawOject(0)
    						If (e.Location.X + HscrollX) > p.X1.X - (p.rotation * 10) And 
    						(e.Location.X + HscrollX) < p.X1.X + 25 -
    						(p.rotation * 10) And
    							((e.Location.Y + VscrollY) > p.X1.Y + (p.rotation * 10)) And 
    							(e.Location.Y + VscrollY < p.X1.Y + 25 + 
    							(p.rotation * 10)) 
    							And p.draw <> Principal.BOLT And p.draw <> Principal.ELLIPSE 
    							And p.draw <> Principal.LABEL Then
    							If p.rotation < 180 Then
    								p.rotation += 5
    								For Each py In lstDrawOject
    									If py.name = p.name Then
    										lstDrawOject.Remove(py)
    										lstSelDrawOject.Clear()
    										lstDrawOject.Add(p)
    										lstSelDrawOject.Add(p)
    										Draw()
    										Exit Sub
    									End If
    								Next
    							End If
    							Exit Sub
    						End If
    						If (e.Location.X + HscrollX) > p.X2.X - (p.rotation * 10) And 
    						(e.Location.X + HscrollX) < p.X2.X + 25 And
    						   (e.Location.Y + VscrollY > p.X2.Y - 10 + (p.rotation * 10))
    						   And (e.Location.Y + VscrollY < p.X2.Y + 21 + 
    						   (p.rotation * 10)) _
    						   And p.draw <> Principal.BOLT And p.draw <> Principal.ELLIPSE 
    						   And p.draw <> Principal.LABEL Then
    							If p.rotation > 0 Then
    								p.rotation -= 5
    								If p.rotation < 0 Then p.rotation = 0
    								For Each py In lstDrawOject
    									If py.name = p.name Then
    										lstDrawOject.Remove(py)
    										lstSelDrawOject.Clear()
    										lstDrawOject.Add(p)
    										lstSelDrawOject.Add(p)
    										Draw()
    										Exit Sub
    									End If
    								Next
    							End If
    							Exit Sub
    						End If
    
    					End If
    					For Each pt In lstDrawOject
    						If InRegion(e, pt) Then
    							AddSelectionObject(pt)
    							Draw()
    							Exit Sub
    						End If
    					Next
    					If (lstSelDrawOject.Count = 0) Then
    						bInSelect = True
    						ptSelAll = New Point(e.Location.X + HscrollX, (e.Location.Y + VscrollY))
    						oldLocation.X = 0
    						For Each pt In lstDrawOject
    							If InRegion(e, pt) Then
    								AddSelectionObject(pt)
    							End If
    						Next
    						Draw()
    					Else
    						bInSelect = False
    					End If
    					Exit Sub
    				End If
    				ptObjectC = New ptObject
    				ptObjectC.X1.X = e.Location.X + HscrollX
    				ptObjectC.X1.Y = (e.Location.Y + VscrollY)
    				ptObjectC.name = "obj" & lstDrawOject.Count + 1
    				ptObjectC.orderDesign = lstDrawOject.Count + 1
    				ptObjectC.dCube = 50
    				If source.nMode = Principal.LABEL Then
    					If Not editText.Visible Then
    						editText.Location = New Point(e.Location.X + HscrollX, (e.Location.Y + VscrollY))
    						editText.Visible = True
    						editText.ForeColor = source._designSettings.DesignForeColor
    						editText.BackColor = source._designSettings.DesignBackColor
    						editText.Font = New Font(source._designSettings.DesignFont.Name, source._designSettings.DesignFont.Size)
    						ptObjectC.directionText = source._designSettings.DesignDirectionText
    						editText.Select()
    						Exit Sub
    					Else
    						editTextLeave(sender, e)
    						Exit Sub
    					End If
    				End If
    				If (source.nMode = Principal.FILL) Then
    					ptFill.X = e.Location.X + HscrollX
    					ptFill.Y = (e.Location.Y + VscrollY)
    				End If
    				If (source.nMode = Principal.CURVE) Then
    					Dim pt As New PointF(e.Location.X + HscrollX, (e.Location.Y + VscrollY))
    					lstCurveDrawOject.Add(pt)
    				End If
    				Draw()
    			Else
    				FinalizeCurveDraw()
    			End If
    	End Sub
     
    

     

    Event MouseMove

    	Public Sub MouseMove(sender As Object, e As MouseEventArgs)
    			HscrollX = source.DrawPan.HorizontalScroll.Value
    			VscrollY = source.DrawPan.VerticalScroll.Value
    			CurrentMouseX = e.Location.X + HscrollX
    			CurrentMouseY = e.Location.Y + VscrollY
    			If (editText.Visible) Then Exit Sub
    			If Principal.SELECTION Then
    				If bMouseDown And ptSelAll <> Nothing And bInSelect Then
    					ptSelAllF = New Point(e.Location.X + HscrollX, (e.Location.Y + VscrollY))
    					For Each pt In lstDrawOject
    						If pt.draw = Principal.CURVE Then
    							calcolaMinMaxCurve(pt)
    							If (ptSelAll.X < pt.X1.X And ptSelAllF.X > pt.X2.X) And 
    							(ptSelAll.Y < pt.X1.Y And ptSelAllF.Y > pt.X2.Y) Then
    								AddSelectionObject(pt)
    							End If
    						Else
    							If (pt.X1.X > ptSelAll.X And pt.X1.Y > ptSelAll.Y And _
    							   pt.X2.X < ptSelAllF.X And pt.X2.Y < ptSelAllF.Y) Then
    								AddSelectionObject(pt)
    							End If
    						End If
    					Next
    					Draw()
    					Exit Sub
    				Else
    					If lstSelDrawOject.Count = 1 And source.nMode = Principal.SELECTION And Not bMouseDown Then
    						source.ResetResize()
    						Dim o As ptObject = lstSelDrawOject(0)
    						calcolaMinMaxCurve(o)
    						If ((e.Location.X + HscrollX) > o.X2.X - 10) And ((e.Location.X + HscrollX) < o.X2.X) And
    							(((e.Location.Y + VscrollY)) > o.X1.Y - 10 + (o.rotation * 10)) And 
    							(((e.Location.Y + VscrollY)) < o.X1.Y + 10 + (o.rotation * 10)) Then
    							source.Cursor = Cursors.Hand
    							If (Not poMenu.isVisible) Then
    								poMenu.GetPopupMenuStyleLines(o, source.DrawPan, o.X2.X - HscrollX, 
    								o.X1.Y - VscrollY + (o.rotation * 10), 
    								source._objSettings)
    							End If
    							Exit Sub
    						End If
    						If (o.draw <> Principal.LABEL) Then
    							If ((e.Location.X + HscrollX) > ((o.X1.X - (o.rotation * 10)) + 
    								((o.X2.X - (o.X1.X - (o.rotation * 10))) / 2)) And
    								((e.Location.X + HscrollX) < ((o.X1.X - (o.rotation * 10)) + 
    									((o.X2.X - (o.X1.X - (o.rotation * 10))) / 2) + 10) And
    							  (((e.Location.Y + VscrollY)) > o.X1.Y - 10 + (o.rotation * 10)) 
    							  And (((e.Location.Y + VscrollY)) < o.X1.Y + 10 +
    							  (o.rotation * 10)))) Then
    								source.Cursor = Cursors.SizeNS
    								source.nResizeUp = True
    								objResize = o
    								Exit Sub
    							End If
    							If ((e.Location.X + HscrollX) > ((o.X1.X - (o.rotation * 10)) + 
    							((o.X2.X - (o.X1.X - (o.rotation * 10))) / 2)) And
    								((e.Location.X + HscrollX) < ((o.X1.X - (o.rotation * 10)) + 
    								((o.X2.X - (o.X1.X - (o.rotation * 10))) / 2) + 10) And
    							 (((e.Location.Y + VscrollY)) > o.X2.Y - 10 + (o.rotation * 10)) 
    								And (((e.Location.Y + VscrollY)) < o.X2.Y + 10 + (o.rotation * 10)))) Then
    								source.Cursor = Cursors.SizeNS
    								source.nResizeDown = True
    								objResize = o
    								Exit Sub
    							End If
    							If ((e.Location.X + HscrollX) > o.X1.X - 5 - (o.rotation * 10) 
    								And ((e.Location.X + HscrollX) < o.X1.X + 10 - (o.rotation * 10)) And
    								(((e.Location.Y + VscrollY)) > o.X1.Y + ((o.X2.Y - o.X1.Y) / 2)) + 
    								(o.rotation * 10) 
    								And (((e.Location.Y + 
    								VscrollY)) < o.X1.Y + ((o.X2.Y - o.X1.Y) / 2)) + 10 +
    								(o.rotation * 10)) Then
    								source.Cursor = Cursors.SizeWE
    								source.nResizeLeft = True
    								objResize = o
    								Exit Sub
    							End If
    							If ((e.Location.X + HscrollX) > o.X2.X And
    							((e.Location.X + HscrollX) < o.X2.X + 10) And
    								(((e.Location.Y + VscrollY)) > o.X1.Y + ((o.X2.Y - o.X1.Y) / 2)) 
    								+ (o.rotation * 10) And
    								(((e.Location.Y + VscrollY)) < o.X1.Y + ((o.X2.Y - o.X1.Y) / 2)) 
    								+ 10 + (o.rotation * 10)) Then
    								source.Cursor = Cursors.SizeWE
    								source.nResizeRight = True
    								objResize = o
    								Exit Sub
    							End If
    						End If
    					End If
    				End If
    			End If
    			If source.nMode = Principal.FILL And source.Cursor <> cursorFill Then
    				source.Cursor = cursorFill
    			End If
    			If bMouseDown Then
    				If source.IsInResize And Not objResize.name Is Nothing Then
    					If (source.nResizeLeft) Then
    						objResize.X1.X = e.Location.X + HscrollX
    						UpdateLstCurveXLeft(objResize)
    					End If
    					If (source.nResizeRight) Then
    						objResize.X2.X = e.Location.X + HscrollX
    					End If
    					If (source.nResizeUp) Then
    						objResize.X1.Y = (e.Location.Y + VscrollY)
    					End If
    					If (source.nResizeDown) Then
    						objResize.X2.Y = (e.Location.Y + VscrollY)
    					End If
    					For Each pt In lstDrawOject
    						If (pt.name = objResize.name) Then
    							lstDrawOject.Remove(pt)
    							Exit For
    						End If
    					Next
    					If (Not objResize.name Is Nothing) Then
    						lstSelDrawOject.Clear()
    						lstSelDrawOject.Add(objResize)
    						lstTempDrawOject.Add(objResize)
    					End If
    					Draw()
    					Exit Sub
    				End If
    				diffX = 0
    				If (oldLocation.X <> 0) Then
    					diffX = (e.Location.X + HscrollX) - oldLocation.X
    				End If
    				diffY = 0
    				If (oldLocation.Y <> 0) Then
    					diffY = ((e.Location.Y + VscrollY)) - oldLocation.Y
    				End If
    				oldLocation.Y = (e.Location.Y + VscrollY)
    				oldLocation.X = e.Location.X + HscrollX
    				If source.nMode = Principal.SELECTION Then
    					source.Cursor = Cursors.SizeAll
    					UpdateDesign(New Point(e.Location.X + HscrollX, (e.Location.Y + VscrollY)))
    				End If
    				If source.nMode = Principal.PEN Then
    					ptObjectC = New ptObject
    					source.Cursor = New Cursor("Pen.cur")
    					ptObjectC.name = "obj" & lstDrawOject.Count + 1
    					ptObjectC.orderDesign = lstDrawOject.Count + 1
    					ptObjectC.X1.X = e.Location.X + HscrollX
    					ptObjectC.X1.Y = (e.Location.Y + VscrollY)
    					ptObjectC.X2.X = e.Location.X + HscrollX
    					ptObjectC.X2.Y = (e.Location.Y + VscrollY)
    					ptObjectC.penLine = New Pen(source._designSettings.DesignForeColor, 1)
    					ptObjectC.penSize = 1
    					ptObjectC.bringToFront = True
    					ptObjectC.ForeColor = source._designSettings.DesignForeColor
    					ptObjectC.FillColor = source._designSettings.DesignFillColor
    					ptObjectC.FillColor2 = source._designSettings.DesignFillColor2
    					ptObjectC.penStyle = Principal.SOLID_STYLE
    					ptObjectC.draw = source.nMode
    					lstDrawOject.Add(ptObjectC)
    				Else
    					If (source.nMode > 0 And source.nMode < 10) And Not ptObjectC.name Is Nothing Then
    						source.Cursor = New Cursor("Pen.cur")
    						ptObjectC.X2.X = e.Location.X + HscrollX
    						ptObjectC.X2.Y = (e.Location.Y + VscrollY)
    						ptObjectC.penLine = New Pen(source._designSettings.DesignForeColor, 1)
    						ptObjectC.penSize = 1
    						ptObjectC.bringToFront = True
    						ptObjectC.ForeColor = source._designSettings.DesignForeColor
    						ptObjectC.FillColor = source._designSettings.DesignFillColor
    						ptObjectC.FillColor2 = source._designSettings.DesignFillColor2
    						ptObjectC.penStyle = Principal.SOLID_STYLE
    						ptObjectC.brushBitmap = source._designSettings.DesignBitmap
    						ptObjectC.draw = source.nMode
    						lstTempDrawOject.Add(ptObjectC)
    					End If
    				End If
    				Draw()
    			End If
    	End Sub
     
    

     

    Event MouseUp

    	Public Sub MouseUp(sender As Object, e As MouseEventArgs)
    			source.Cursor = Nothing
    			ptSelAll = Nothing
    			ptSelAllF = Nothing
    			ctrlKey = False
    			HscrollX = source.DrawPan.HorizontalScroll.Value
    			VscrollY = source.DrawPan.VerticalScroll.Value
    			If (source.nMode <> Principal.FILL) Then
    				source.Cursor = Cursors.Default
    			End If
    			bMouseDown = False
    			If (source.nMode > 0 And source.nMode < 10) And Not source.IsInResize 
    			    And source.nMode <> Principal.CURVE 
    				And source.nMode <> Principal.PEN Then
    				ptObjectC.X2.X = e.Location.X + HscrollX
    				ptObjectC.X2.Y = (e.Location.Y + VscrollY)
    				ptObjectC.brushBitmap = ""
    				ptObjectC.XORIG1.X = ptObjectC.X1.X
    				ptObjectC.XORIG2.X = ptObjectC.X2.X
    				ptObjectC.XORIG1.Y = ptObjectC.X1.Y
    				ptObjectC.XORIG2.Y = ptObjectC.X2.Y
    				ptObjectC.rotation = 0
    				ptObjectC.penLine = New Pen(source._designSettings.DesignForeColor, 1)
    				ptObjectC.brushBitmap = source._designSettings.DesignBitmap
    				ptObjectC.penStyle = Principal.SOLID_STYLE
    				ptObjectC.penSize = 1
    				ptObjectC.dCube = 50
    				ptObjectC.draw = source.nMode
    				ptObjectC.brightness = 1.2F
    				ptObjectC.contrast = 1.0F
    				ptObjectC.gamma = 1.0F
    				ptObjectC.bitmap = source.imageBitmap
    				ptObjectC.bringToFront = True
    				ptObjectC.name = "obj" & lstDrawOject.Count + 1
    				ptObjectC.orderDesign = lstDrawOject.Count + 1
    				lstDrawOject.Add(ptObjectC)
    				ptObjectC = Nothing
    			Else
    				If source.IsInResize Then
    					For Each ptO In lstDrawOject
    						If (ptO.name = objResize.name) Then
    							lstDrawOject.Remove(ptO)
    							Exit For
    						End If
    					Next
    					If (Not objResize.name Is Nothing) Then
    						lstDrawOject.Add(objResize)
    					End If
    					objResize.name = Nothing
    				End If
    			End If
    			Draw()
    	End Sub
    
     
    

     

    Event Resize

    	Private Sub Resize(sender As Object, e As EventArgs)
    			Draw()
    	End Sub
    	 
    

    Now let's see some menu function
    	Public Sub CopySelectedObject()  ' This function allows us to copy the selected objects.
    		lstCopiedSelDrawOject.Clear()
    		For Each p In lstSelDrawOject
    			lstCopiedSelDrawOject.Add(p)
    		Next
    	End Sub
     
    

    Instead with this one, paste the selected objects
    	Public Sub PasteCopiedObject()
    		lstSelDrawOject.Clear()
    		For Each p In lstCopiedSelDrawOject
    			Dim pn As New ptObject
    			pn = p
    			pn.name = "obj" & CStr(lstDrawOject.Count + 1)
    			pn.X1.X = pn.X1.X - 50
    			pn.X2.X = pn.X2.X - 50
    			lstSelDrawOject.Add(pn)
    			lstDrawOject.Add(pn)
    		Next
    		lstCopiedSelDrawOject.Clear()
    		source.setButtonSelectiobSelected()
    		source.nMode = Principal.SELECTION
    		Draw()
    	End Sub
     
    

    AddSelectionObject allows us to add an object to the selection
    	Public Sub AddSelectionObject(obj As ptObject)
    		Dim b As Boolean = False
    		For Each o In lstSelDrawOject
    			If o.name = obj.name Then
    				b = True
    				Exit For
    			End If
    		Next
    		If (Not b) Then
    			lstSelDrawOject.Add(obj)
    		End If
    	End Sub
     
    

     

    The AppSettings class

     
    This class implement the iterface ISettings and allows the application properties to be saved
    	Public Interface ISettings
    		Sub SaveSetting(_xmlAppSetting As String)
    		Sub Load()
    		Sub SaveSetting(ByRef obj As ptObject)
    		Sub Load(obj As ptObject)
    		Function getCountProperties()
    	End Interface
    
    	Public Class AppSettings : Implements ISettings
    		Protected _size As System.Drawing.Size
    		Dim _ApplicationFont As Font
    		Dim _ApplicationBackColor As Color = New Color()
    		Dim _ApplicationForeColor As Color = New Color()
    		Dim _MenuBackColor As Color = New Color()
    		Dim _MenuForeColor As Color = New Color()
    		Dim _title As String
    		Dim _show As Boolean
    		Dim _number As Short
    
    		
    		Public Property Title() As String
    			Get
    				Return _title
    			End Get
    			Set(ByVal value As String)
    				_title = value
    			End Set
    		End Property
    		
    		Public Property Show() As Boolean
    			Get
    				Return _show
    			End Get
    			Set(value As Boolean)
    				_show = value
    			End Set
    		End Property
    
    		
    		Public Property ApplicationFont() As System.Drawing.Font
    			Get
    				Return _ApplicationFont
    			End Get
    			Set(ByVal Value As System.Drawing.Font)
    				_ApplicationFont = Value
    			End Set
    		End Property
    
    		
    		Public Property WindowSize() As System.Drawing.Size
    			Get
    				Return _size
    			End Get
    			Set(ByVal value As System.Drawing.Size)
    				_size = value
    			End Set
    		End Property
    		Public Property ApplicationBackColor() As Color
    			Get
    				Return _ApplicationBackColor
    			End Get
    			Set(ByVal Value As Color)
    				_ApplicationBackColor = Value
    			End Set
    		End Property
    		
    		Public Property ApplicationForeColor() As Color
    			Get
    				Return _ApplicationForeColor
    			End Get
    			Set(ByVal Value As Color)
    				_ApplicationForeColor = Value
    			End Set
    		End Property
    
    		
    		Public Property MenuBackColor() As Color
    			Get
    				Return _MenuBackColor
    			End Get
    			Set(ByVal Value As Color)
    				_MenuBackColor = Value
    			End Set
    		End Property
    		
    		Public Property MenuForeColor() As Color
    			Get
    				Return _MenuForeColor
    			End Get
    			Set(ByVal Value As Color)
    				_MenuForeColor = Value
    			End Set
    		End Property
    		Public Sub Load() Implements ISettings.Load
    			Dim reader As TextReader
    			Dim fileNotFound As Boolean
    			Dim fontName As String = ""
    
    			Try
    				reader = New StreamReader(Principal.xmlAppSetting)
    			Catch ex As FileNotFoundException
    				' Take the defaults
    				fileNotFound = True
    			End Try
    
    			If fileNotFound Then
    				WindowSize = New System.Drawing.Size(308, 774)
    				_ApplicationBackColor = Color.CadetBlue
    				_ApplicationForeColor = Color.Black
    				_MenuBackColor = Color.Black
    				_MenuForeColor = Color.White
    				_ApplicationFont = New Font("Arial", 8)
    			Else
    				Dim xr As XmlReader = XmlReader.Create(Principal.xmlAppSetting)
    				Do While xr.Read()
    					Dim read As Boolean = False
    
    					If (xr.NodeType = XmlNodeType.Element) Then
    
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "Title" Then
    							Title = xr.ReadElementString()
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "Show" Then
    							Show = xr.ReadElementString()
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "Size" Then
    							Dim s() As String
    							Dim s1 As Integer
    							Dim s2 As Integer
    							Dim svalue = xr.ReadElementString()
    							svalue = svalue.Replace("{", "")
    							svalue = svalue.Replace("}", "")
    							s = svalue.Split(",")
    							s1 = CInt(s(0).Substring(s(0).IndexOf("=") + 1))
    							s2 = CInt(s(1).Substring(s(1).IndexOf("=") + 1))
    							WindowSize = New Size(s1, s2)
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "FontName" Then
    							fontName = xr.ReadElementString()
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "FontSize" Then
    							If (fontName <> "") Then
    								ApplicationFont = New Font(fontName, CInt(xr.ReadElementString()))
    							End If
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "BackColor" Then
    							Dim svalue = xr.ReadElementString()
    							ApplicationBackColor = Color.FromArgb(CInt(svalue))
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "ForeColor" Then
    							Dim svalue = xr.ReadElementString()
    							ApplicationForeColor = Color.FromArgb(CInt(svalue))
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "MenuBackColor" Then
    							Dim svalue = xr.ReadElementString()
    							MenuBackColor = Color.FromArgb(CInt(svalue))
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "MenuForeColor" Then
    							Dim svalue = xr.ReadElementString()
    							MenuForeColor = Color.FromArgb(CInt(svalue))
    							read = True
    						End If
    						If (Not read) Then
    							xr.Read()
    						End If
    
    					Else
    
    						xr.Read()
    					End If
    				Loop
    
    				xr.Close()
    				reader.Close()
    			End If
    	End Sub
    		
    	Public Sub SaveSetting(_xmlAppSetting As String) Implements ISettings.SaveSetting
    			Dim xws As XmlWriterSettings = New XmlWriterSettings()
    			xws.Indent = True
    			xws.NewLineOnAttributes = True
    			Dim xw As XmlWriter = XmlWriter.Create(_xmlAppSetting, xws)
    			xw.WriteStartDocument()
    			xw.WriteStartElement("Settings")
    			xw.WriteElementString("Title", Title)
    			xw.WriteElementString("Show", Show)
    			xw.WriteElementString("Size", WindowSize.ToString)
    			If Not ApplicationFont Is Nothing Then
    				xw.WriteElementString("FontName", ApplicationFont.Name)
    				xw.WriteElementString("FontSize", ApplicationFont.Size)
    			End If
    			xw.WriteElementString("BackColor", ApplicationBackColor.ToArgb().ToString())
    			xw.WriteElementString("ForeColor", ApplicationForeColor.ToArgb().ToString())
    			xw.WriteElementString("MenuBackColor", MenuBackColor.ToArgb().ToString())
    			xw.WriteElementString("MenuForeColor", MenuForeColor.ToArgb().ToString())
    			xw.WriteEndElement()
    			xw.WriteEndDocument()
    			xw.Flush()
    			xw.Close()
    		End Sub
    
    		Public Sub SaveSetting(ByRef obj As ptObject) Implements ISettings.SaveSetting
    		End Sub
    		Public Sub Load(obj As ptObject) Implements ISettings.Load
    		End Sub
    		Public Function getCountProperties() Implements ISettings.getCountProperties
    			Return 8
    		End Function
    	End Class
    

     

    DesignSettings class

     
    This class implement the iterface ISettings and allows the draw properties to be saved
    	public Class DesignSettings : Implements ISettings
    		Protected _size As System.Drawing.Size
    		Const HORIZONTAL = "Horizonal"
    		Private _DesignFont As Font
    		Private _DesignBackColor As Color = New Color()
    		Private _DesignForeColor As Color = New Color()
    		Private _DesignDirectionText As String = HORIZONTAL
    		Private _DesignFillColor As Color = New Color()
    		Private _DesignFillColor2 As Color = New Color()
    		Private _PenStyle As String = Principal.SOLID_STYLE
    		Private _PenSize As String = "1"
    		Private _Text As String
    		Private _bringToFront As Boolean = False
    		Private colorCombination As String
    		Private _DesignBitmap As String
    		Private princ As Principal
    		Public Sub setPrincipal(ByRef _princ As Principal)
    			princ = _princ
    		End Sub
    
    		Private Sub draw()
    			If princ IsNot Nothing Then
    				princ.UpdateColors()
    			End If
    		End Sub
    
    		Public Property WindowSize() As System.Drawing.Size
    			Get
    				Return _size
    			End Get
    			Set(ByVal value As System.Drawing.Size)
    				_size = value
    			End Set
    		End Property
    		
    		Public Property DesignFont() As System.Drawing.Font
    			Get
    				Return _DesignFont
    			End Get
    			Set(ByVal Value As System.Drawing.Font)
    				_DesignFont = Value
    				If princ IsNot Nothing Then
    					princ._designSettings._DesignFont = Value
    					draw()
    				End If
    			End Set
    		End Property
    
    		
    		Public Property DesignBackColor() As Color
    			Get
    				Return _DesignBackColor
    			End Get
    			Set(ByVal Value As Color)
    				_DesignBackColor = Value
    				If princ IsNot Nothing Then
    					princ._designSettings._DesignBackColor = Value
    					draw()
    				End If
    			End Set
    		End Property
    		Public Property DesignForeColor() As Color
    			Get
    				Return _DesignForeColor
    			End Get
    			Set(ByVal Value As Color)
    				_DesignForeColor = Value
    				If princ IsNot Nothing Then
    					princ._designSettings._DesignForeColor = Value
    					draw()
    				End If
    			End Set
    		End Property
    		Public Property DesignFillColor() As Color
    			Get
    				Return _DesignFillColor
    			End Get
    			Set(ByVal Value As Color)
    				_DesignFillColor = Value
    				If princ IsNot Nothing Then
    					princ._designSettings._DesignFillColor = Value
    					draw()
    				End If
    			End Set
    		End Property
    
    		Public Property DesignFillColor2() As Color
    			Get
    				Return _DesignFillColor2
    			End Get
    			Set(ByVal Value As Color)
    				_DesignFillColor2 = Value
    				If princ IsNot Nothing Then
    					princ._designSettings._DesignFillColor2 = Value
    					draw()
    				End If
    			End Set
    		End Property
    		
    		Public Property DesignDirectionText() As String
    			Get
    				Return _DesignDirectionText
    			End Get
    			Set(ByVal Value As String)
    				_DesignDirectionText = Value
    				If princ IsNot Nothing Then
    					princ._designSettings._DesignDirectionText = Value
    					draw()
    				End If
    			End Set
    		End Property
    
    		
    		Public Property DesignBitmap() As String
    			Get
    				Return _DesignBitmap
    			End Get
    			Set(ByVal Value As String)
    				_DesignBitmap = Value
    				If princ IsNot Nothing Then
    					princ._designSettings._DesignBitmap = Value
    					draw()
    				End If
    			End Set
    		End Property
    
    		Public Sub Load() Implements ISettings.Load
    			Dim reader As TextReader
    			Dim fileNotFound As Boolean
    			Dim fontName As String = ""
    			Try
    				reader = New StreamReader(Principal.xmlDesignSetting)
    			Catch ex As FileNotFoundException
    				' Take the defaults
    				fileNotFound = True
    			End Try
    
    			If fileNotFound Then
    				WindowSize = New System.Drawing.Size(308, 774)
    				_DesignBackColor = Color.White
    				_DesignForeColor = Color.Black
    				_DesignFont = New Font("Arial", 8)
    				_DesignFillColor = Color.White
    				_DesignFillColor2 = Color.White
    				_DesignDirectionText = HORIZONTAL
    			Else
    				Dim xr As XmlReader = XmlReader.Create(Principal.xmlDesignSetting)
    				Do While xr.Read()
    					Dim read As Boolean = False
    
    					If (xr.NodeType = XmlNodeType.Element) Then
    
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "Size" Then
    							Dim s() As String
    							Dim s1 As Integer
    							Dim s2 As Integer
    							Dim svalue = xr.ReadElementString()
    							svalue = svalue.Replace("{", "")
    							svalue = svalue.Replace("}", "")
    							s = svalue.Split(",")
    							s1 = CInt(s(0).Substring(s(0).IndexOf("=") + 1))
    							s2 = CInt(s(1).Substring(s(1).IndexOf("=") + 1))
    							WindowSize = New Size(s1, s2)
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "FontName" Then
    							fontName = xr.ReadElementString()
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "FontSize" Then
    							If (fontName <> "") Then
    								DesignFont = New Font(fontName, CInt(xr.ReadElementString()))
    							End If
    							read = True
    						End If
    
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "BackColor" Then
    							Dim svalue = xr.ReadElementString()
    							DesignBackColor = Color.FromArgb(CInt(svalue))
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "ForeColor" Then
    							Dim svalue = xr.ReadElementString()
    							DesignForeColor = Color.FromArgb(CInt(svalue))
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "DirectionText" Then
    							DesignDirectionText = xr.ReadElementString()
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "FillColor" Then
    							Dim svalue = xr.ReadElementString()
    							DesignFillColor = Color.FromArgb(CInt(svalue))
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "FillColor2" Then
    							Dim svalue = xr.ReadElementString()
    							DesignFillColor2 = Color.FromArgb(CInt(svalue))
    							read = True
    						End If
    						If xr.NodeType = XmlNodeType.Element AndAlso xr.Name = "BrushBitmap" Then
    							DesignBitmap = xr.ReadElementString()
    							read = True
    						End If
    						If (Not read) Then
    							xr.Read()
    						End If
    
    					Else
    
    						xr.Read()
    					End If
    				Loop
    
    				xr.Close()
    				reader.Close()
    			End If
    		End Sub
    		Public Sub SaveSetting(_xmlDesignSetting As String) Implements ISettings.SaveSetting
    			Dim xws As XmlWriterSettings = New XmlWriterSettings()
    			xws.Indent = True
    			xws.NewLineOnAttributes = True
    			Dim xw As XmlWriter = XmlWriter.Create(_xmlDesignSetting, xws)
    			xw.WriteStartDocument()
    			xw.WriteStartElement("Settings")
    			xw.WriteElementString("Size", WindowSize.ToString)
    			If Not DesignFont Is Nothing Then
    				xw.WriteElementString("FontName", DesignFont.Name)
    				xw.WriteElementString("FontSize", DesignFont.Size)
    			End If
    			xw.WriteElementString("BackColor", DesignBackColor.ToArgb().ToString())
    			xw.WriteElementString("ForeColor", DesignForeColor.ToArgb().ToString())
    			xw.WriteElementString("DirectionText", DesignDirectionText)
    			xw.WriteElementString("FillColor", DesignFillColor.ToArgb().ToString())
    			xw.WriteElementString("FillColor2", DesignFillColor2.ToArgb().ToString())
    			xw.WriteElementString("BrushBitmap", DesignBitmap)
    			xw.WriteEndElement()
    			xw.WriteEndDocument()
    			xw.Flush()
    			xw.Close()
    		End Sub
    		Public Sub SaveSetting(ByRef obj As ptObject) Implements ISettings.SaveSetting
    		End Sub
    		Public Sub Load(obj As ptObject) Implements ISettings.Load
    		End Sub
    
    		Public Function getCountProperties() Implements ISettings.getCountProperties
    			Return 5
    		End Function
    	End Class
    	 
    

     

    The class PopupMenu show menu when right mouse click

     
    	Public Class PopupMenu
    
    		Private clrBack As Color
    		Private clrForColor As Color
    		Private panMenu As Panel
    		Private par As Panel
    		Private propertyGrid As PPropertyGrid
    		Private objDzoDraw As DZODraw
    		Public isVisible As Boolean = False
    
    
    		Public Sub New(_designer As DZODraw, _clrBack As Color, _clrForeColor As Color)
    			clrBack = _clrBack
    			clrForColor = _clrForeColor
    			objDzoDraw = _designer
    		End Sub
    
    		Public Function DestroyPopupMenu() As ptObject
    			isVisible = False
    			Dim o As ptObject = propertyGrid.getPtObj()
    			If (panMenu IsNot Nothing) Then
    				propertyGrid = Nothing
    				par.Controls.Remove(panMenu)
    				panMenu = Nothing
    			End If
    			Return o
    		End Function
    
    		Public Function GetPopupMenuStyleLines(ByRef pt As ptObject, p As Panel, x As Integer, y As Integer, 
    			objSetting As ISettings) As Panel
    			panMenu = New Panel
    			panMenu.BorderStyle = BorderStyle.FixedSingle
    			panMenu.Width = 200
    			panMenu.BackColor = clrBack
    			panMenu.ForeColor = clrForColor
    			panMenu.Height = objSetting.getCountProperties() * 40 + 100
    			propertyGrid = New PPropertyGrid(objDzoDraw, panMenu, objSetting, "")
    			propertyGrid.setPtObject(pt)
    			propertyGrid.Create(p)
    			panMenu.Visible = True
    			panMenu.Location = New Point(x, y)
    			propertyGrid.Width = panMenu.Width
    			propertyGrid.Height = panMenu.Height
    			propertyGrid.Left = 0
    			propertyGrid.Top = 0
    			propertyGrid.Select()
    			par = p
    			isVisible = True
    			Return panMenu
    		End Function
    	End Class
    	 
    

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