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Automatic highlighting in a raster graphics display system

  • US 4,725,829 A
  • Filed: 09/06/1985
  • Issued: 02/16/1988
  • Est. Priority Date: 09/12/1984
  • Status: Expired due to Fees
First Claim
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1. In an interactive graphics display system in which pels in a frame buffer are mapped to the display screen of a raster display device, a method of automatically highlighting and de-highlighting graphic segments as a cursor is moved from an initial position to successive positions across the display screen said method comprising sampling a locator device at an initial and successive points in time to generate a screen cursor at corresponding positions on the screen raster, examining pels in the frame buffer along a line which extends from the pel corresponding to a previous cursor position in the succession of positions to the pel corresponding to the current cursor position to determine whether a pel is "on" along the line, such pel examination occurring at least when the current cursor position is greater than a certain distance from a previously detected "on" pel, automatically performing a correlate operation in respect of a newly detected "on" pel (if any) to identify the said graphic segment associated with that pel in said buffer and highlighting said segment, the correlate operation being performed when a prior correlate operation is not already in progress, and highlighting the newly correlated said segment, any highlighted segment being de-highlighted prior to highlighting a different segment.

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