VerticalTextJP.vb
''
'' This code is part of GrapeCity Documents for PDF samples.
'' Copyright (c) GrapeCity, Inc. All rights reserved.
''
Imports System.IO
Imports System.Drawing
Imports GrapeCity.Documents.Pdf
Imports GrapeCity.Documents.Text
Imports GrapeCity.Documents.Drawing

'' Draws vertical right-to-left Japanese text using a layout with horizontal columns.
'' See also ArabicColumns, MultiLang and VerticalText.
Public Class VerticalTextJP

    Const text = "日本語(にほんご、にっぽんご)は、主として、日本列島で使用されてきた言語である。日本手話を母語とする者などを除いて、ほぼ全ての日本在住者は日本語を第一言語とする。日本国は法令上、公用語を明記していないが、事実上の公用語となっており、学校教育の「国語」で教えられる。使用者は、日本国内を主として約\uFF11億\uFF13千万人。日本語の文法体系や音韻体系を反映する手話として日本語対応手話がある。"

    Function CreatePDF(ByVal stream As Stream) As Integer
        Using clouds As Image = Image.FromFile(Path.Combine("Resources", "Images", "clouds.jpg")),
            firth As Image = Image.FromFile(Path.Combine("Resources", "Images", "firth.jpg")),
            lavender As Image = Image.FromFile(Path.Combine("Resources", "Images", "lavender.jpg"))
            Dim yumin = Font.FromFile(Path.Combine("Resources", "Fonts", "yumin.ttf"))
            Dim ia = New ImageAlign(ImageAlignHorz.Left, ImageAlignVert.Top, True, True, True, False, False)

            Dim doc = New GcPdfDocument()

            '' The TextLayout that will hold and render the text:
            Dim tl = New TextLayout()
            tl.FirstLineIndent = 18
            tl.ParagraphSpacing = 6
            tl.FlowDirection = FlowDirection.VerticalRightToLeft
            tl.TextAlignment = TextAlignment.Justified
            tl.AlignmentDelayToSplit = True
            Dim tf = New TextFormat() With {.Font = yumin, .FontSize = 12}
            '' Repeat test text to fill a few pages:
            For i = 0 To 25
                tl.Append(text, tf)
                tl.AppendLine()
            Next

            '' Layout text in 4 horizontal columns:
            '' (The logic/code in this sample is identical to ArabicColumns):
            Const NCOLS = 4
            Dim margin = 36.0F
            Dim gap = 18.0F
            Dim page = doc.NewPage()
            page.Landscape = True
            Dim colHeight = (page.Size.Height - margin * 2 - gap * (NCOLS - 1)) / NCOLS
            tl.MaxWidth = page.Size.Width
            tl.MaxHeight = page.Size.Height
            tl.MarginLeft = margin
            tl.MarginRight = margin
            tl.MarginTop = margin
            tl.MarginBottom = margin + (colHeight + gap) * (NCOLS - 1)
            '' We can specify arbitrary rectangles for the text to flow around.
            '' In this case, we add 3 areas to draw some images:
            tl.ObjectRects = New List(Of ObjectRect) From {
                New ObjectRect(page.Size.Width - margin - 267, margin, 267, 200),
                New ObjectRect(margin + 100, margin + 60, 133, 100),
                New ObjectRect(margin, page.Size.Height - margin - 301, 200, 301)
            }
            '' Convert object rects to image areas, adjust to provide nice looking padding:
            Dim rClouds = tl.ObjectRects(0).ToRectangleF()
            rClouds.Inflate(-4, -3)
            Dim rFirth = tl.ObjectRects(1).ToRectangleF()
            rFirth.Inflate(-4, -3)
            Dim rLavender = tl.ObjectRects(2).ToRectangleF()
            rLavender.Inflate(-4, -3)
            page.Graphics.DrawImage(clouds, rClouds, Nothing, ia)
            page.Graphics.DrawImage(firth, rFirth, Nothing, ia)
            page.Graphics.DrawImage(lavender, rLavender, Nothing, ia)

            '' THE call: it calculates the glyphs needed to draw the text, and lays it out:
            tl.PerformLayout(True)

            '' Loop while there is still text to render:
            Dim done = False
            While Not done
                For col = 1 To NCOLS
                    Dim nextcol = If(col < NCOLS, col, 0)
                    '' TextSplitOptions tell TextLayout.Split() how to layout the remaining text.
                    '' In this case we advance from column to column by updating top and bottom margins:
                    Dim tso = New TextSplitOptions(tl) With {
                    .RestMarginTop = margin + (colHeight + gap) * nextcol,
                    .RestMarginBottom = margin + (colHeight + gap) * (NCOLS - 1 - nextcol)
                }
                    Dim rest As TextLayout = Nothing
                    Dim split = tl.Split(tso, rest)
                    page.Graphics.DrawTextLayout(tl, PointF.Empty)
                    If split <> SplitResult.Split Then
                        done = True
                        Exit For
                    End If
                    tl = rest
                Next
                If Not done Then
                    page = doc.NewPage()
                    page.Landscape = True
                    '' We only want to render images on the first page, so clear ObjectRect:
                    If tl.ObjectRects IsNot Nothing Then
                        tl.ObjectRects = Nothing
                        '' We need to redo the layout, but no need to recalculate the glyphs:
                        tl.PerformLayout(False)
                    End If
                End If
            End While
            ''
            '' Done:
            doc.Save(stream)
            Return doc.Pages.Count
        End Using
    End Function
End Class