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View navigation guidance system for hand held devices with display

  • US 9,424,810 B2
  • Filed: 01/31/2014
  • Issued: 08/23/2016
  • Est. Priority Date: 12/03/2009
  • Status: Active Grant
First Claim
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1. A method for guiding the view navigation of a virtual display on the screen view of a physical display, comprising the steps of:

  • (a) computing a first rectangle corresponding to the shape and size of said virtual display;

    (b) computing a second rectangle corresponding to the shape and size of said screen view;

    (c) rendering a guidance map on a graphic layer showing said first rectangle scaled down by a scale factor computed to fit said first rectangle within a predefined area;

    (d) scaling down said second rectangle by said scale factor and rendering said second rectangle to said guidance map at a position within said first rectangle corresponding to the relative location of said screen view within said virtual display;

    (e) displaying said graphic layer with said guidance map as heads-up display layer at a predefined location on said screen view;

    (f) examining changes in the relation between said screen view and said virtual display performed at a predefined view navigation update rate; and

    (g) updating said guidance map by repeating steps (a) through (e) when changes in the relation between said screen view and said virtual display detected in step (f) exceed a predefined limit, whereby said guidance map indicates the position and size of said screen view relative to said virtual display.

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