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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
     
     

    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
    Happy coding

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