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Convert PDF coordinates to view layout coord

Questions about Android development and PDF

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TOPIC:

Convert PDF coordinates to view layout coord 6 years 7 months ago #12883

geertvm
Topic Author
Offline
New Member
Posts: 16
Thank you received: 0

Hi,

I have a custom layout (RelativeLayout) which holds a PDFLayoutView
and a custom toolbar (also a RelativeLayout with some imagebuttons)

First of all I want to detect if the user tapped on a visible signature field.
I think we can handle that by implementing the setOnTouchListener and converting the raw x and
y coordinates with the PDFLayout.PDFPos pdfPos = m_view.PDFGetPos(x, y);

I also want to draw some kind of overlay on visible signature fields (with known PDF coordinates).
I've started by implementing the PDFLayoutView.PDFLayoutListener() and the OnPageDisplayed
So I suppose it could be possible to draw a rectangle on the canvas...
How can I convert these PDF coordinates to the layout coordinates so that I can draw an rectangle on top of a visible signature field
(It's possible that this field is only visible after some scrolling...)

Thanks
Geert

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Convert PDF coordinates to view layout coord 6 years 7 months ago #12887

nermeen
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Platinum Member
Posts: 962
Thank you received: 87

You can implement PDFLayoutListener.OnPDFAnnotTapped (which get fired when an annot is tapped) and filter based on Annot type and annot filed type to detect a signature field.
You can also get the annotation rectangle (position) in PDF coordinates and convert it to view coordinates to be used later in OnPageDisplayed, check the below code:

@Override
	public void OnPDFAnnotTapped(VPage vpage, Annotation annot)
	{
		...
		if(annot != null && annot.GetType() == 20 && annot.GetFieldType() == 4) {
			float[] annotRect = annot.GetRect();
			float tmp = annotRect[1];
			annotRect[0] = vpage.GetVX(annotRect[0]) - m_view.PDFGetX();
			annotRect[1] = vpage.GetVY(annotRect[3]) - m_view.PDFGetY();
			annotRect[2] = vpage.GetVX(annotRect[2]) - m_view.PDFGetX();
			annotRect[3] = vpage.GetVY(tmp) - m_view.PDFGetY();
		}
		...
	}

Note: m_view.PDFGetX() and m_view.PDFGetY() are introduced in the latest version 3.14.2, you can add them in PDFLayoutView:

public float PDFGetX() {
		return m_layout != null ? m_layout.vGetX() : 0;
	}

	public float PDFGetY() {
		return m_layout != null ? m_layout.vGetY() : 0;
	}

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Last edit: by nermeen.

Convert PDF coordinates to view layout coord 6 years 7 months ago #12888

geertvm Topic Author Offline New Member Posts: 16 Thank you received: 0	The digital signature field isn't recognized... but the code helped me in displaying the overlay... Attachments:
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Convert PDF coordinates to view layout coord 6 years 7 months ago #12891

nermeen Offline Platinum Member Posts: 962 Thank you received: 87	The pdf you have sent does not contain a signature field (it only contains a text). As a consequence the code above wont work. Same behavior with Acrobat and other readers.
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Convert PDF coordinates to view layout coord 6 years 7 months ago #12893

geertvm Topic Author Offline New Member Posts: 16 Thank you received: 0	sorry, uploaded the wrong pdf... This one has 2 visible signature fields... Attachments:
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Convert PDF coordinates to view layout coord 6 years 7 months ago #12894

nermeen Offline Platinum Member Posts: 962 Thank you received: 87	We have tested your new pdf with the above code, and the annotations can be recognized. Can you retest by adding the above code into the demo project?
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