Method and apparatus for raster computer graphics display of rot

Details Method and apparatus for raster computer graphics display of rot Method and apparatus for raster computer graphics display of rot

1997-01-31

1999-11-16

Nguyen, Phu K.

Computer graphics processing and selective visual display system

Computer graphics processing

G06T 1700

Patent

active

059866586

ABSTRACT:
A method and apparatus for displaying line rotation on a raster computer graphics display, so that substantially rotated versions of original lines maintain a line style pattern that is identical to a line style pattern of the original lines. The invention includes controlling the line style of the substantially rotated version based upon rotation of the substantially rotated version. A line style array is stored in a computer memory for storing consecutive line style pattern features of the substantially rotated version of the first line and assigning a respective length value to each of the pattern features. A line style feature pixel counter is used for counting the pixels of each line style pattern feature. A comparator is used for comparing the incremented pixel counter to the respective length value. A pixel step value is scaled based upon a trigonometric function of the rotation of the substantially rotated version so as to generate a scaled pixel step value. An incrementer is used for incrementing the pixel counter by the scaled pixel step value.

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