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 | |
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 ) | |
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 |
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 |
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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