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Electronic boundary generation

  • US 5,227,770 A
  • Filed: 02/05/1991
  • Issued: 07/13/1993
  • Est. Priority Date: 02/05/1990
  • Status: Expired due to Term
First Claim
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1. A method of generating an electronic representation of a boundary comprising the steps of:

  • in a first mode, moving a cursor about a screen display to spaced points along a desired boundary;

    determining the coordinates of the boundary by interpolating straight lines between the adjacent points; and

    displaying the interpolated straight lines; and

    ion a second, continuous drawing mode, defining at least part of the boundary by continuously moving the cursor along the boundary of the coordinates of successive cursor positions being determined, wherein the movement of the cursor in the first and second modes so as to generate the boundary is controlled by moving an indicating device in a drawing region of a detection plane, and wherein the second, continuous drawing mode is selected when the pressure exerted by the indicating device in the drawing region on the detection plane satisfies predetermined conditions.

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