Zoom to column width

dashti
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IP: 192.168.0.71 11 years 10 months ago #7690 by dashti

Zoom to column width was created by dashti

Hi,
I'm developing an android application using PDF SDK while I need to zoom to a specific text column. E.g. in a two column page, if you double tap on a column, the reader should zoom to fit that column. How this is possible with PDF SDK?
Thanks in advance.

Davide
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IP: 192.168.0.156 11 years 10 months ago #7693 by Davide

Replied by Davide on topic Zoom to column width

Hi,
there is no API to achieve this equipement.

Double tap zoom and center the zoom based on the tapped position.

dashti
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IP: 192.168.0.71 11 years 10 months ago #7701 by dashti

Replied by dashti on topic Zoom to column width

So, how should I do zoom "based on tapped position"? How I can find out the proper zoom level?

Davide
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IP: 192.168.0.156 11 years 10 months ago #7705 by Davide

Replied by Davide on topic Zoom to column width

Hi,
this is the zoom's standard behaviour.
If you want to increase the zoom you have to modify the zoomLevel in default_config() void in Global class (max 5).
With this m_view.vGetScale(); you can get the current scale.
With this m_view.vGetMaxScale(); you can get the max scale.
With this m_view.vGetMinScale(); you can get the min scale.

dashti
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IP: 192.168.0.71 11 years 10 months ago #7761 by dashti

Replied by dashti on topic Zoom to column width

Hi,

I can see the following code in PDFReader.java

Code:

public boolean OnPDFDoubleTapped(float x, float y)
	{
		if( m_status != STA_NORMAL ) return false;
		m_view.vSetScale(m_view.vGetScale() + Global.zoomStep, x, y);
		return true;
	}

This is default action of double tap to increase zoom level. My point is how to find the proper zoom scale to be passed to vSetScale, based on the content width of the position where the user has touched the screen.

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