Appeal No. 2004-0429
Application 09/335,289
displacement value is calculated based upon the thickness of the
graphic primitive. The offset is approximately one half of the
thickness of the primitive. Follwing calculation of the offset
value, line drawing parameter values are determined for a line
that is parallel to the origin line and displaced from the origin
line in a minor axis direction by the displacement of offset
value. A loop is then repeated for each grip point in the major
axis range of the line. The loop includes an initial step in
which a boundary pixel of the thick graphic primitive is drawn
using the line drawing algorithm and the line drawing parameter
values calculated for the offset line. After the boundary pixel
has been drawn, one or more adjacent pixels are drawn using a
stepping routine in which the minor axis coordinate of the
selected pixel is either decremented or incremented, depending
upon the slope of the line, to write the pixels adjacent the
boundary pixel. In this fashion, the present invention draws a
thick primitive as a sequence of segments that are parallel to
the minor axis of the orgin line. Because line parameters are
calculated for only a single line using the present invention,
the setup time required to initiate the drawing of the thick
primitive is achieved with a minimum of overhead. Appellants’
specification at page 2, lines 4-21.
2
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