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how to add PdfUnderlineAnnotation - jmclsdy
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jmclsdy  
#1 Posted : Tuesday, March 17, 2020 12:50:01 AM(UTC)
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jmclsdy

Rank: Newbie

Groups: Registered
Joined: 3/4/2020(UTC)
Posts: 2
China
hi:

Code:
Private Sub addUnderlineannot(ByVal page As PdfPage,byval rect As FS_RECTF)
		If page.Annots Is Nothing Then page.CreateAnnotations()	
		Dim pathobj =PdfPathObject.Create(FillModes.Winding,True)
		pathObj.Path.AppendRect(rect)
		pathObj.StrokeColor = FS_COLOR.Transparent
		pathObj.FillColor =  FS_COLOR.Transparent 
		pathObj.CalcBoundingBox()
		Dim annot As PdfTextMarkupAnnotation 
		annot=New PdfUnderlineAnnotation(page)
		annot.Color = FS_COLOR.Black 
		annot.Opacity = 1.0f
		annot.Rectangle = rect	
		annot.QuadPoints.add((new FS_QUADPOINTSF(rect)))
		annot.CreateEmptyAppearance(AppearanceStreamModes.Normal)
		annot.NormalAppearance.Add(pathobj)	
		annot.GenerateAppearance(AppearanceStreamModes.Normal)	
		page.annots.Add(annot)
		page.Dispose()
	End Sub


1、Object reference is not set to an instance of the object
2、Don't show the underline（Delete this line annot.QuadPoints.add((new FS_QUADPOINTSF(rect)))）

Edited by moderator Tuesday, March 17, 2020 9:05:16 PM(UTC)  | Reason: Not specified
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Paul Rayman  
#2 Posted : Tuesday, March 17, 2020 9:21:40 PM(UTC)
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Paul Rayman

Rank: Administration

Groups: Administrators
Joined: 1/5/2016(UTC)
Posts: 1,138

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you have two ways to create an underline annotation

1.
Code:

var page = pdfViewer1.Document.Pages[0];
if (page.Annots == null)
	page.CreateAnnotations();
page.Annots.Add(new PdfUnderlineAnnotation(page, new FS_POINTF(40, 450), new FS_POINTF(140, 490), new FS_POINTF(130, 400), new FS_POINTF(30, 360), FS_COLOR.Black));
page.Dispose();


2.
Code:

var underlineAnnotWithoutAppearance = new PdfUnderlineAnnotation(page);
underlineAnnotWithoutAppearance.Color = FS_COLOR.Blue;
underlineAnnotWithoutAppearance.Opacity = 1.0f;
underlineAnnotWithoutAppearance.QuadPoints = new PdfQuadPointsCollection();
underlineAnnotWithoutAppearance.QuadPoints.Add(new FS_QUADPOINTSF(20, 40, 120, 40, 20, 10, 120, 10));
underlineAnnotWithoutAppearance.QuadPoints.Add(new FS_QUADPOINTSF(130, 80, 300, 180, 140, 10, 250, 40));
page.Annots.Add(underlineAnnotWithoutAppearance);
underlineAnnotWithoutAppearance.RegenerateAppearances();
page.Dispose();

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jmclsdy  
#3 Posted : Tuesday, March 17, 2020 11:34:41 PM(UTC)
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jmclsdy

Rank: Newbie

Groups: Registered
Joined: 3/4/2020(UTC)
Posts: 2
China
thank you,very good
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