Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1992-10-13
1995-10-24
Powell, Mark R.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
395129, 395131, 345136, 382173, G06K 1500
Patent
active
054617030
ABSTRACT:
A data processing system that prints characters using a raster-scan pixel representation employs an inversion technique to achieve the filling of interior pixels within a polygon. At intersections of segments that define edges of the polygon, a common pixel may be shared by the last pixel of a first line segment and a first pixel of a second line segment. The inversion action is inhibited when considering the last pixel of the aforesaid first segment and is turned on for the first pixel of the next segment. In this manner, double inversions that cause fill splinters are avoided. The data processing system also employs a method for rendering vectors with pen widths of varying magnitude where, based upon the angle of inclination of the vector, its end points are derived. The end points are then modified by addition of integer offset values to take into account differences between given pen widths and pixel-integer pen widths. Then, resultant co-ordinate end points are revised to provide an approximately square end, based upon the found angle of inclination. A procedure is also described for assuring a best choice of a pixel to turn ON at an intersection of line segments.
REFERENCES:
patent: 4815009 (1989-03-01), Blatin
patent: 4887228 (1989-12-01), Robert
patent: 4897805 (1990-01-01), Wang
patent: 5123085 (1992-06-01), Wells et al.
patent: 5276783 (1994-01-01), Fossum
Graphics Area Fill with Point Classification, IBM Technical Disclosure Bulletin, vol. 27, No. 11, Apr. 1985, pp. 6398-6400.
"The Edge Flag Algorithm--A Fill Method For Raster Scan Displays", Ackland et al; IEEE Transactions on Computers, vol. C-30, No. 1, Jan. 1981, pp. 41-47.
"Efficient Polygon-Filling Algorithms For Raster Displays", Dunlavey, ACM Transactions on Graphics, vol. 2, No. 4, Oct. 1983, pp. 264-273.
"Digitized Brush Trajectories", Hobby, Report No. STAN-CS-85-1070, Dept. Of Computer Science, Stanford University (1985).
"Rendering Fat Lines on a Raster Grid", by Wallace, "Graphics Gems", Glassner, Editor, Academic Press, Inc. San Diego, Calif. 92101 (1990), pp. 114-120.
Frederiksen Dellas
Goyins Gregg
Papke Jeff H.
Hewlett--Packard Company
Legree Tracy M.
Powell Mark R.
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