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13 Jul 2017
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TOPIC: Double tap Zoom

Double tap Zoom 2 years 7 months ago #10477

  • digitalpages
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Hi,

I need create a feature using double tap for enable zoom, but I can't do the layout goes to the position tapped.

Follow my code:

public void doZoom(int x, int y) {
final float scale = m_layout.vGetZoom();
float zoomTo = scale + 1;
if (scale >= maxZoom) {
zoomTo = 1.0f;
}
m_layout.vZoomStart();
final PDFPos pdfPos = PDFGetPos(x, y);
m_layout.vZoomSet(x, y, pdfPos, zoomTo);
m_layout.vZoomConfirmed();
}

Thanks

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Double tap Zoom 2 years 7 months ago #10479

  • Davide
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Hi,
if you want a doubleZoom In/Out you only have to add the following line at the end of OnPDFDoubleTapped method of PDFReader class before the return statement:
Global.zoomStep *= -1;

Maybe this will help you : www.radaeepdf.com/forum/Android-developm...et?limitstart=0#9795

If you want a different behaviour please better explain your needs..

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Last edit: by Davide.

Double tap Zoom 2 years 7 months ago #10489

  • digitalpages
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HI,

I'm using PDFLayoutView and this don't have a onPDFDoubleTapped method.

My code do a zoom, but I need center de pega zoomed in the tapped position, this not work in my code.

Do you recommend I change the view I'm using?

Thanks

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Double tap Zoom 2 years 7 months ago #10492

  • Davide
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Hi,
try to add this method to PDFLayoutView:
public PDFLayout getLayout(){
return m_layout;
}

then change your code with something like that
PDFLayout layout = m_view.getLayout();
PDFLayout.PDFPos pdfPos= layout.vGetPos((int) x, (int) y);

If it doesn't work, check x and y values...are they correctly passed to your method?

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