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Freehand drawing containing invisible lines

  • US 4,757,549 A
  • Filed: 12/12/1985
  • Issued: 07/12/1988
  • Est. Priority Date: 12/12/1985
  • Status: Expired due to Fees
First Claim
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1. In a computer based graphic editor, a method of recognizing as a single graphic object a plurality of unconnected freehand strokes comprising the steps of:

  • detecting and storing with a visible attribute a first point at a beginning of a displayable stroke which is a first stroke of said plurality of unconnected strokes;

    storing each successive point of said first stroke with said visible at tribute;

    detecting a last point of said first stroke and storing said last point with an invisible attribute;

    repeating each of the preceding steps for each succeeding stroke of said plurality of unconnected strokes;

    each time a first point and a last point of a succeeding stroke are detected, comparing a last point of a previous stroke with first and last points of a current stroke and if said first and last points of the current stroke are within a predetermined tolerance range and there exist no other points between said first and last points of the current stroke and if the first point of the current stroke and the last point of the previous stroke are within said predetermined tolerance range, detecting an end of said plurality of unconnected strokes; and

    recognizing said plurality of unconnected strokes as a single graphic object in said graphic editor by storing said strokes connected by invisible lines connecting successive invisible and visible attributes, whereby in formatting a document, said graphic editor will display said single graphic object without fragmentation.

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