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Variable speed, image pan method and apparatus

  • US 5,075,673 A
  • Filed: 06/16/1989
  • Issued: 12/24/1991
  • Est. Priority Date: 06/16/1989
  • Status: Expired due to Term
First Claim
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1. In a display apparatus able to pan a viewport image across a world-plane image, said viewport image having defined limits and exhibiting a cursor whose position is movable by user operated means, a method for providing a variable rate pan action of said viewport image, comprising the steps of:

  • a. panning the viewport image at a preset rate in the direction of a viewport limit if the cursor has been moved to said viewport limit; and

    b. determining if the cursor has been moved beyond a viewport limit and the distance said cursor has been moved beyond said viewport limit; and

    c. panning said viewport in the direction of said limit at a faster rate which varies with said determined distance of said cursor beyond said viewport limit, said faster rate solely determinable from the position of said cursor in relation to said viewport limit.

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