Draw with Transparency in PDF - VB.NET
PDF SDK sample in VB.NET demonstrating ‘Draw with Transparency in PDF’
Program.vb
Imports Bytescout.PDF
''' <summary>
''' This example demonstrates how to draw transparent objects.
''' </summary>
Class Program
Shared Sub Main()
' Create new document
Dim 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")
' Add page
Dim page = New Page(PaperFormat.A4)
pdfDocument.Pages.Add(page)
Dim canvas = page.Canvas
' Prepare pens and brushes
Dim borderPen = New SolidPen(New ColorRGB(0, 0, 0), 2.0F)
Dim brush1 = New SolidBrush(New ColorRGB(255, 0, 0))
Dim brush2 = New SolidBrush(New ColorRGB(0, 0, 255))
borderPen.Opacity = 50
brush1.Opacity = 30
brush2.Opacity = 60
' Draw normal rectangles
canvas.DrawRectangle(brush1, 100, 100, 100, 100)
canvas.DrawRectangle(borderPen, brush2, 150, 150, 100, 100)
borderPen.Opacity = 80
brush1.Opacity = 60
brush2.Opacity = 30
' Draw rounded rectangles
canvas.DrawRoundedRectangle(brush1, 220, 100, 100, 100, 10)
canvas.DrawRoundedRectangle(borderPen, brush2, 270, 150, 100, 100, 10)
' Save document to file
pdfDocument.Save("result.pdf")
' Cleanup
pdfDocument.Dispose()
' Open document in default PDF viewer app
Process.Start("result.pdf")
End Sub
End Class
Resources.Designer.vb
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