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        VDI Viewer for PDA >> VDIV Discussion >>  VDI for PDF viewing
        
(Message started by: juardo on May 2nd, 2010, 8:20am)
Title: VDI for PDF viewing
Post by juardo on May 2nd, 2010, 8:20am
Hello,

I'm thinking of using VDI for reading books in PDF. Sometimes, Most of the time, PDF pages do not fit the Palm TX screen, so it is necessary to do a right-left scrolling. You have to do it for every text line in the page. It's annoying.

I'm thinking of using VDI for doing the right-left scrolling (and also the down scroll) automatically, just as PalmFiction does the down scrolling, at an appropriate speed.

This would require me learning how to program for Palm OS. Before starting, I'd like to know the following:

- Would it be too difficult to change the code so that large screens, like the TX, can be used? Currently, only half of the screen is used. I've tried Codediver, but it does not work with VDI.

- Would it be difficult to do a smoother scrolling?. I've tried to read a pdf text (previously converted to jpg), and the right scrolling is a bit jerky.

- Do you think it would be difficult to do the automatic scrolling for reading books?.
Title: Re: VDI for PDF viewing
Post by Denis Bakin on Jun 10th, 2010, 5:34pm
Hi,

I'm not sure it's a good idea. First of all Palm is a dead OS now. Second, PDF doc pages are going to be converted to images and images need much more memory to store than text.

I do not know what the TX screen size is. If it is 320x320 then you'd only need to tell VDI that it should use that (for Palm it was high resolution) mode and the number of bits per pixel.

I don't think there is an easy way to make the horizontal scrolling smoother.

The automatic scrolling should be relatively easy to do.

Hope that helps.
Title: Re: VDI for PDF viewing
Post by juardo on Jun 13th, 2010, 1:47pm
Hello,

I tested the idea by using Isilo's automatic scrolling. I just rotated images 90 degrees, so that vertical scrolling worked as horizontal scrolling. It worked, but it was not comfortable to read (it was a bit "jumpy", I guess because the TX resolution is not that high). If Isilo's programmers were not able to do a better scrolling, I won't be able to do it in VDI, so I've abandoned the idea.

But thanks for the answer!

Cheers,



read pdfs converted to Isislo's format



on 06/10/10 at 17:34:44, Denis Bakin wrote:
Hi,

I'm not sure it's a good idea. First of all Palm is a dead OS now. Second, PDF doc pages are going to be converted to images and images need much more memory to store than text.

I do not know what the TX screen size is. If it is 320x320 then you'd only need to tell VDI that it should use that (for Palm it was high resolution) mode and the number of bits per pixel.

I don't think there is an easy way to make the horizontal scrolling smoother.

The automatic scrolling should be relatively easy to do.

Hope that helps.


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