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Method and system for recognizing a graphic object's shape, line style, and fill pattern in a pen environment

  • US 5,636,297 A
  • Filed: 09/09/1994
  • Issued: 06/03/1997
  • Est. Priority Date: 09/10/1992
  • Status: Expired due to Term
First Claim
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1. A method of recognizing a graphic object in a computer system, the computer system comprising a handwriting instrument and an electronic tablet, the graphic object comprising a shape attribute and a plurality of format attributes, the method comprising the steps of:

  • inputting a plurality of data points into the computer system, the data points being produced by drawing the graphic object on the electronic tablet with the handwriting instrument, the data points comprising shape-defining data points and interior-defining data points, the shape-defining data points representative of the shape attribute and at least one of the plurality of format attributes and the interior-defining data points representative of at least one of the plurality of the format attributes, each data point having an x-coordinate and a y-coordinate;

    for each data point,mapping the data point to a normalized data point, the normalized data point having an x-coordinate and a y-coordinate that are within a predetermined range of values, the predetermined range of values defining a square area;

    generating a transformed normalized data point, the transformed data point having an x-coordinate equal to a sum of the x-coordinate of the normalized data point plus the y-coordinate of the normalized data point and a y-coordinate equal to a difference of the x-coordinate of the normalized data point minus the y-coordinate of the normalized data point; and

    determining whether the transformed data point corresponds to a shape-defining data point or an interior-defining data point;

    determining the shape attribute and the formatting attributes of the graphic object based on the coordinates of the transformed data points; and

    selecting a representation corresponding to the determined shape attribute and the determined format attributes of the graphic object.

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