Raster display smooth line generation

Details Raster display smooth line generation Raster display smooth line generation

G - Physics

09

G

375/21, 354/25

G09G 3/00 (2006.01) G06K 15/02 (2006.01) G09G 5/02 (2006.01) G09G 5/20 (2006.01)

Patent

CA 1221780

-38- Abstract of the Disclosure A high speed arrangement for generating smooth lines of consistent thickness regardless of slope in a raster type display system such as a computer graphics system. A digital differential analyzer is employed for determining Y-position information to n bits of fraction for each integral step in X within a single operative clock cycle. All pixel positions are identi- fied that are relevantly proximate to the starting end point of the line, to the concluding end point, and each one-dimensional array of at least three con- tiguous pixel positions encompassing a cross-section of the interior portion of the line. Intensity values are determined for each such identified pixel position based upon its distance from the true line, with the intensities of the pixel positions identified in each array being additionally determined based upon the slope of the line. For crossing-line situations in color systems, proportional weighting apparatus is pro- vided which generates a new pixel-position value based upon the existing intensity value, the desired color of the line and the intensity value associated to the crossing line, with the latter constituting a propor- tionality constant.

448437

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