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Create Invoice Spanning Multiple Page | VB.NET
Program.vb:
VB
Imports Bytescout.PDF ''' <summary> ''' This example demonstrates how to create invoice which can span multiple pages. ''' </summary> Class Program #Region "Global Declarations" Const HeightConsumedByTableRow As Int32 = 20 Shared ContentHeightStart As Int32 = 100 Shared ContentHeightEnd As Int32 = 700 Shared HeightUtilized As Int32 = 100 Shared _RowCounter As Int32 = 1 Shared pdfDocument As Document Shared page As Page #End Region Shared Sub Main() #Region "Declarations and Implementations" Dim SolidPen As New SolidPen() Dim blackBrush As New SolidBrush(New ColorRGB(0, 0, 0)) Dim headerFont As New Font(StandardFonts.TimesBold, 24) Dim headerFont2 As New Font(StandardFonts.TimesBold, 16) Dim contentFont_12 As New Font(StandardFonts.TimesBold, 12) Dim contentFont_10 As New Font(StandardFonts.Times, 10) ' Create New document pdfDocument = New Document() pdfDocument.RegistrationName = "demo" pdfDocument.RegistrationKey = "demo" ' If you wish to load an existing document uncomment the line below And comment the Add page section instead ' pdfDocument.Load(".\existing_document.pdf") #End Region ' Add New page AddNewPage() ' 1. Add Content page.Canvas.DrawString("COMPANY NAME", contentFont_12, blackBrush, 50, HeightUtilized) HeightUtilized += 20 page.Canvas.DrawString("Address", contentFont_10, blackBrush, 50, HeightUtilized) page.Canvas.DrawString("DATE", contentFont_10, blackBrush, 400, HeightUtilized) HeightUtilized += 20 page.Canvas.DrawString("Phone, fax", contentFont_10, blackBrush, 50, HeightUtilized) page.Canvas.DrawString("INVOICE #", contentFont_10, blackBrush, 400, HeightUtilized) HeightUtilized += 20 page.Canvas.DrawString("E-mail", contentFont_10, blackBrush, 50, HeightUtilized) page.Canvas.DrawString("FOR", contentFont_10, blackBrush, 400, HeightUtilized) ' Add some vertical space HeightUtilized += 50 ' 2. Add Table which can span multipage Console.WriteLine("Enter the number of rows to add to the table:") Dim numberOfRows As Int32 = Convert.ToInt32(Console.ReadLine()) DrawTable(NumberOfRows:=numberOfRows) ' 3. Add Signature ' Check New page needed for adding signature If (CheckNewPageNeeded(70)) Then AddNewPage() End If page.Canvas.DrawString("Signature", contentFont_12, blackBrush, 400, (HeightUtilized + 57)) page.Canvas.DrawLine(SolidPen, 450, (HeightUtilized + 70), 570, (HeightUtilized + 70)) '4. Add Header And Footer For pageIndex = 0 To pdfDocument.Pages.Count - 1 Dim curPage As Page = pdfDocument.Pages(pageIndex) ' Add Logo Dim imageLogo As Image = New Image("logo.png") curPage.Canvas.DrawImage(imageLogo, 20, 45, imageLogo.Width / 2, imageLogo.Height / 2) ' Add requisites curPage.Canvas.DrawString("INVOICE", headerFont, blackBrush, 450, 55) ' Add Page Number curPage.Canvas.DrawLine(SolidPen, 20, 750, 590, 750) curPage.Canvas.DrawString($"Page: {pageIndex + 1} of {pdfDocument.Pages.Count}", contentFont_10, blackBrush, 30, 760) Next ' Save document to file pdfDocument.Save("result.pdf") ' Cleanup pdfDocument.Dispose() ' Open document in default PDF viewer app Process.Start("result.pdf") End Sub ''' <summary> ''' Checks whether new page is needed ''' </summary> ''' <param name="expectedHeight"></param> ''' <returns></returns> Shared Function CheckNewPageNeeded(expectedHeight As Int32) As Boolean Return (HeightUtilized + expectedHeight) > ContentHeightEnd End Function ''' <summary> ''' Adds new page, and also set height utilized ''' </summary> Shared Sub AddNewPage() ' Add page page = New Page(PaperFormat.Letter, PaperOrientation.Portrait) pdfDocument.Pages.Add(page) ' Reset Height Utilized HeightUtilized = ContentHeightStart End Sub ''' <summary> ''' Draw table ''' </summary> ''' <param name="NumberOfRows"></param> Shared Sub DrawTable(NumberOfRows As Int32) While (NumberOfRows > 0) ' Get number of rows can be added in current page Dim NumberOfRowsCanBeAddedInCurrentPage As Int32 = GetNumberOfRowsCanBeAddedInCurrentPage() If (NumberOfRowsCanBeAddedInCurrentPage > 0) Then Dim Table = GetTable(Math.Min(NumberOfRows, NumberOfRowsCanBeAddedInCurrentPage)) page.Canvas.DrawTable(Table, 50, HeightUtilized) ' Update Height Utilized HeightUtilized += (Math.Min(NumberOfRows, NumberOfRowsCanBeAddedInCurrentPage) * HeightConsumedByTableRow) NumberOfRows -= Math.Min(NumberOfRows, NumberOfRowsCanBeAddedInCurrentPage) Else ' Add New page AddNewPage() End If End While End Sub ''' <summary> ''' Get Table Header with Content ''' </summary> ''' <param name="NumberOfRows"></param> ''' <returns></returns> Shared Function GetTable(NumberOfRows As Int32) As Table Dim fontTableHeader As Font = New Font(StandardFonts.TimesBold, 11) Dim fontTableRow As Font = New Font(StandardFonts.Times, 10) Dim Table As New Table() ' 1. Add Table Header Table.Columns.Add(New TableColumn("Description", "Description")) Table.Columns(0).Width = 220 Table.Columns(0).Font = fontTableHeader Table.Columns(0).TextFormat.HorizontalAlign = HorizontalAlign.Left Table.Columns.Add(New TableColumn("Quantity", "Quantity")) Table.Columns(1).Width = 80 Table.Columns(1).Font = fontTableHeader Table.Columns(1).TextFormat.HorizontalAlign = HorizontalAlign.Right Table.Columns.Add(New TableColumn("Price", "Price")) Table.Columns(2).Width = 100 Table.Columns(2).Font = fontTableHeader Table.Columns(2).TextFormat.HorizontalAlign = HorizontalAlign.Right Table.Columns.Add(New TableColumn("Amount", "Amount")) Table.Columns(3).Width = 120 Table.Columns(3).Font = fontTableHeader Table.Columns(3).TextFormat.HorizontalAlign = HorizontalAlign.Right ' 2. Add Table Content For index = 0 To NumberOfRows - 1 ' Create New row And set its background color Dim row As TableRow = Table.NewRow() ' Set row header text row("Description").Text = $"Description For item - {_RowCounter}" row("Description").Font = fontTableRow row("Description").TextFormat.HorizontalAlign = HorizontalAlign.Left row("Quantity").Text = "###" row("Quantity").Font = fontTableRow row("Quantity").TextFormat.HorizontalAlign = HorizontalAlign.Right row("Price").Text = "$$$.$$" row("Price").Font = fontTableRow row("Price").TextFormat.HorizontalAlign = HorizontalAlign.Right row("Amount").Text = "$$$.$$" row("Amount").Font = fontTableRow row("Amount").TextFormat.HorizontalAlign = HorizontalAlign.Right ' Add the row to the table Table.Rows.Add(row) ' Increase _RowCounter _RowCounter += 1 Next Return Table End Function ''' <summary> ''' Get number of rows can be added in current page ''' </summary> ''' <returns></returns> Shared Function GetNumberOfRowsCanBeAddedInCurrentPage() As Integer Return (ContentHeightEnd - HeightUtilized) / HeightConsumedByTableRow End Function End Class