Method and apparatus for drawing antialiased lines and polygons

Details Method and apparatus for drawing antialiased lines and polygons Method and apparatus for drawing antialiased lines and polygons

1986-03-10

1989-01-03

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340723, 340744, 340747, 340793, G09G 100

Patent

active

047960205

ABSTRACT:
A method and apparatus that employ precomputed line profiles to draw lines on a raster scan terminal with mostly horizontal or vertical "brush strokes" that develop the desired line profiles. The precomputed line profiles relate mostly to the slope of the drawn lines and to the position of the drawn lines between adjacent pixels on the raster scan terminal in the direction of the "brush strokes". A relatively small number of precomputed values is required, permitting the apparatus to operate at the low resolution of the raster scan and be driven advantageously by a look-up table. This results in a very fast operation of the system while leading to pleasing results. The method also takes into account corners and end-of-line conditions to avoid very abrupt and unnatural looking end points.

REFERENCES:
patent: 4237457 (1980-12-01), Houldsworth
patent: 4262290 (1981-04-01), Vallins
patent: 4591843 (1986-05-01), Pratt
patent: 4591897 (1986-05-01), Edelson
patent: 4612540 (1986-09-01), Pratt
K. Turkowski, "Anti-Aliasing Through the Use of Coordinate Transformations," ACM Transactions on Graphics, vol. 1, No. 3, Jul. 1982, pp. 215-234.
J. Barros et al., "Generating Smooth 2-D Monocolor Line Drawings on Video Displays," Computer Graphics, vol. 13, Aug. 1979, pp. 260-269.
J. T. Whitted, "Anti-Aliased Line Drawings Using Brush Extrusion," ACM Transactions on Computer Graphics, vol. 17, Jul. 1983, pp. 151-156.
A. Fujimoto et al., "Jag Free Images on a Raster CRT," Computer Graphics, Theory and Applications, 1983, pp. 2-15.

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