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How to find rotated PdfTextObject's rotated bounding box? - Paul Rayman
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rhnatiuk  
#1 Posted : Friday, June 7, 2019 6:03:47 AM(UTC)
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rhnatiuk

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Hi,

Yet another noob question :)

Is it possible to find out the rotated bounding box of a rotated PdfTextObject? By "rotated" bounding box I mean a bounding box aligned with the rotated text, i.e. that is rotated by the same angle.

Our old PDF library was able to produce such a bounding box, but I cannot figure out if it is possible with Pdfium.Net.

Best regards,
Roman
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Paul Rayman  
#2 Posted : Friday, June 14, 2019 5:06:09 AM(UTC)
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Paul Rayman

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What do you mean under bounding box, the quadrilateral like this:
quadrilateral
or rectangle with coordinates (left/top) - (right/bottom) (x4, y3) - (x2,y1)

There is no easy way to get quadrilateral of rotated text object, but you can calculate it.
I can suggest the following workaround:
  1. Create clone of TextObject;
  2. Rotate it to the angle that is opposite to the angle of the source text object;
  3. Get bounding box of this text object;
  4. Rotate the bounding box to the original angle;

Edited by user Friday, June 14, 2019 5:06:51 AM(UTC)  | Reason: Not specified
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thanks 1 user thanked Paul Rayman for this useful post.
rhnatiuk on 6/14/2019(UTC)
rhnatiuk  
#3 Posted : Friday, June 14, 2019 5:43:40 AM(UTC)
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rhnatiuk

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You are a genius! And we are, obviously, dumb! :D Thank you!!!
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