| 摘要 |
In a computer graphics system in which information defining graphic images to be presented on an output display is available on a scan line basis for a pair of line segments subtending a portion of the an image to be presented. The information includes the slope of each line segment and the addresses of each line segment on each scan line. A circuit comprising two comparator subportions, each of the comparator subportions being adapted to process information regarding one edge of the portion of the image to be presented and including apparatus for receiving first signals representing values of both of the line segments to be procesed for one scan line. Comparing the signals to determine their relative X positions on the scan line, controlling the determination of the relative X positions and the slope of each line segment, and storing one of the signals compared. Receiving second signals representing values of both of the line segments to be processed for the same scan line comparing the second signals to determine their relative X positions on the scan line, and comparing the second signals and the stored one of the signals to select a value for the edge of the particular scan line.
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