Line segment depicting system for a display image memory

Details Line segment depicting system for a display image memory Line segment depicting system for a display image memory

1992-09-04

1994-04-19

Herndon, Heather R.

Computer graphics processing and selective visual display system

Display driving control circuitry

Controlling the condition of display elements

395142, 345136, G06F 1562

Patent

active

053054326

ABSTRACT:
A line segment depicting system includes an error discrimination condition memory for designating for each octant an error discrimination condition applied when a DDA (Digital Differential Analyzer) error item is 0.5. First and second different error discrimination conditions are set in the condition memory for first to fourth octants, and for fifth to eighth octants, respectively. A data processing unit receives information of a given line segment and determines in which octant the given line segment is included, and the result of determination is stored in an octant memory, which controls a selector for selecting one of outputs of the error discrimination condition memory. The data processing unit also supplies a DDA parameter to a DDA unit, which sequentially generates a coordinate value (Xn, Yn) of dot positions of an approximate line segment with reference to the error discrimination condition supplied through the selector from the error discrimination condition memory.

REFERENCES:
patent: 4593372 (1986-06-01), Bandai et al.
patent: 4623880 (1986-11-01), Bresenham et al.
patent: 5028848 (1991-07-01), Bankston et al.

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