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Image editor zoom function

  • US 5,187,776 A
  • Filed: 06/16/1989
  • Issued: 02/16/1993
  • Est. Priority Date: 06/16/1989
  • Status: Expired due to Term
First Claim
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1. In a system having image display means comprising a plurality of physical pels, a method of operating an image editor in response to input from a user of the system, the method comprising the steps of:

  • displaying a magnified portion of a first image as a second image comprised of a plurality of logical pels having a size that is a function of a magnification level in effect, the second image having a first cursor positioned therein;

    displaying within the second image a viewport containing a portion of the first image, the portion corresponding to the magnified portion, the viewport having a vertical and a horizontal dimension corresponding to a plurality of physical pels of the first image and further having a second cursor having a position that corresponds to the position of the first cursor;

    responsive to the user repositioning the first cursor such that the first cursor would be located outside of the displayed second image,shifting the second image in increments of logical pels in unison with movement of the first cursor; and

    responsive to the second cursor reaching a first edge of the viewport in response to the movement of the first cursor,shifting the viewport by a plurality of physical pels that correspond to the vertical or the horizontal dimension of the viewport such that the second cursor is positioned substantially adjacent to a second edge of the viewport that is oppositely disposed to the first edge.

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