PDFsharp & MigraDoc Foundation

PDFsharp - A .NET library for processing PDF & MigraDoc Foundation - Creating documents on the fly
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PostPosted: Tue Dec 28, 2021 1:08 pm 
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Joined: Tue Dec 14, 2021 7:21 pm
Posts: 4
Following on from my difficulties with Concatenation of documents that included Formfields, I have been looking at creating each document without form fields and using drawstring for each item.

Could anyone assist with suggestions about text rotation where there are multiple items of text.

I have experimented using the Hello World example but placing 2 text strings on the document and rotating the string when drawing using RotateAtTransform. I can prevent the rotation for each string by commenting out the RotateAtTransform command. This way I can sample all 4 possible cases for the two strings.

Unfortunately I find that I am not getting each string rotated with the following results:

Instruction // Result
Test Text A / Text B / Text A / Text B
1 Horizontal (No rot) / Horizontal / A Horizontal / B Horizontal
2 Rotate / Horizontal / A Rotated / B NOT shown
3 Horizontal (No Rot) / Rotate / A Horizontal / B Rotated
4 Rotate / Rotate / A Rotated / B NOT shown ----- Same RESULT as Test 2

From the tests, I can conclude that the string is not drawn IF I have already done a RotateAtTransform for a previous string.

Could anyone advise what I am doing wrong or what I need to add after each transformation so that any further strings get then get drawn and rotated as needed?

I would be pleased for any comments as having looked at many examples, I cannot see what I need to do differently.

Code:-
Public Sub testpdf()
Dim document As PdfDocument = New PdfDocument()
document.Info.Title = "Created with PDF sharp"

'CreateObject empty page
Dim page As PdfPage = document.AddPage()

'create an xgraphics object for drawing
Dim gfx As XGraphics = XGraphics.FromPdfPage(page)

'draw crossing lines
Dim pen As XPen = New XPen(XColor.FromArgb(255, 0, 0))
gfx.DrawLine(pen, New XPoint(0, 0), New XPoint(page.Width.Point, page.Height.Point))
gfx.DrawLine(pen, New XPoint(page.Width.Point, 0), New XPoint(0, page.Height.Point))

'draw ellipse
gfx.DrawEllipse(pen, 3 * page.Width.Point / 10, 3 * page.Height.Point / 10, 2 * page.Width.Point / 5, 2 * page.Height.Point / 5)

'create font
Dim font As XFont = New XFont("Arial", 72, XFontStyle.Regular)
Dim OPfilename As String = "HelloworldTest1.pdf"

'draw Title
gfx.DrawString("1", font, XBrushes.Black, New XRect(page.Width.Point / 2, page.Height.Point / 2, 50, 72), XStringFormats.CenterLeft)

font = New XFont("Arial", 12, XFontStyle.Regular)

'TEST
'draw text A
'.RotateAtTransform(90, New XPoint(22, 300))
gfx.DrawString("AAAAAAAA", font, XBrushes.Black, New XRect(22, 300, 50, 20), XStringFormats.CenterLeft)

'draw text B
' gfx.RotateAtTransform(90, New XPoint(425, 560))
gfx.DrawString("BBBBBBBB", font, XBrushes.Black, New XRect(425, 560, 50, 20), XStringFormats.CenterRight)

' SAVE the document
document.Save(strNamePath & "\PDTIX\Created" & OPfilename)

' start a viewer
Process.Start(strNamePath & "\PDTIX\Created" & OPfilename)

End Sub


Attachments:
File comment: Test3 result
HWTest3.jpg
HWTest3.jpg [ 240.13 KiB | Viewed 159 times ]
File comment: Test2 result
HWTest2.jpg
HWTest2.jpg [ 238.58 KiB | Viewed 159 times ]
File comment: Test1 result
HWTest1.jpg
HWTest1.jpg [ 238.94 KiB | Viewed 159 times ]
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PostPosted: Wed Dec 29, 2021 10:33 am 
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PDFsharp Expert
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Joined: Sat Mar 14, 2015 10:15 am
Posts: 699
Location: CCAA
You apply transformations to the XGraphics object - and all transformations are accumulated.

What you are missing is "this.state = gfx.Save();" before applying the transformation and "gfx.Restore(this.state);" when the transformations are no longer needed.
The name of the field (here "this.state") does not matter, but make sure to store the state.
See also:
http://pdfsharp.net/wiki/Graphics-sampl ... sformed_22

_________________
Best regards
Thomas
(Freelance Software Developer with several years of MigraDoc/PDFsharp experience)


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PostPosted: Thu Jan 13, 2022 9:26 am 
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Joined: Tue Dec 14, 2021 7:21 pm
Posts: 4
Thanks for your advice - that has worked perfectly.

Chris


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