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Remove colour attributes from body and strip most of the font tags out

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James Gregory 2013-12-30 13:57:02 +11:00
commit c1f88ddb41
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@ -24,7 +24,7 @@
<!--CHAPTER=42//-->
<!--PAGES=787-792//-->
<!--UNASSIGNED1//-->
<!--UNASSIGNED2//--></HEAD><BODY LINK=#0000FF ALINK=#000099 VLINK=#0000FF BGCOLOR=#FFFFFF>
<!--UNASSIGNED2//--></HEAD><body>
<CENTER>
<TABLE BORDER>
@ -310,7 +310,7 @@ _DrawWuLine endp
end
</PRE>
<!-- END CODE //-->
<H4 ALIGN="LEFT"><A NAME="Heading6"></A><FONT COLOR="#000077">Notes on Wu Antialiasing</FONT></H4>
<H4 ALIGN="LEFT"><A NAME="Heading6"></A>Notes on Wu Antialiasing</H4>
<P>Wu antialiasing can be applied to any curve for which it&rsquo;s possible to calculate at each step the positions and intensities of two bracketing pixels, although the implementation will generally be nowhere near as efficient as it is for lines. However, Wu&rsquo;s article in <I>Computer Graphics</I> does describe an efficient algorithm for drawing antialiased circles. Wu also describes a technique for antialiasing solids, such as filled circles and polygons. Wu&rsquo;s approach biases the edges of filled objects outward. Although this is no good for adjacent polygons of the sort used in rendering, it&rsquo;s certainly possible to design a more accurate polygon-antialiasing approach around Wu&rsquo;s basic weighting technique. The results would not be quite so good as more sophisticated antialiasing techniques, but they would be much faster.</P>
<TABLE WIDTH="100%"><TD VALIGN="TOP" ALIGN="LEFT" WIDTH="5%"><IMG SRC="images/i.jpg"><TD VALIGN="TOP" ALIGN="LEFT" WIDTH="95%"><SMALL><I>In general, the results obtained by Wu antialiasing are only so-so, by theoretical measures. Wu antialiasing amounts to a simple box filter placed over a fixed-point step approximation of a line, and that process introduces a good deal of deviation from the ideal. On the other hand, Wu notes that even a 10 percent error in intensity doesn&rsquo;t lead to noticeable loss of image quality, and for Wu-antialiased lines up to 1K pixels in length, the error is under 10 percent. If it looks good, it is good&mdash;and it looks good.</I></SMALL>
</TABLE>
@ -331,7 +331,7 @@ _DrawWuLine endp
<hr width="90%" size="1" noshade>
<div align="center">
<font face="Verdana,sans-serif" size="1">Graphics Programming Black Book &copy; 2001 Michael Abrash</font>
Graphics Programming Black Book &copy; 2001 Michael Abrash
</div>
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