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Update manual.md

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Andy McFadden 2015-08-31 13:34:00 -07:00
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@ -584,6 +584,12 @@ The rendering of filled circles is very fast, though there is a possibility
of optimizing the center-fill of large circles. Outline circles were of optimizing the center-fill of large circles. Outline circles were
added by inserting JSR PLOT at key points, and could perhaps be faster. added by inserting JSR PLOT at key points, and could perhaps be faster.
The best way to accelerate circle drawing is to not draw a full circle.
Instead, draw an approximation of a circle using a series of lines. This
is a common technique when using 3D graphics hardware, as they are
generally geared toward polygon rendering. Outline circles would see a
significant improvement, with some reduction in quality.
### Drawing Lines with Indexed Byte-Arrays ### ### Drawing Lines with Indexed Byte-Arrays ###