Misc/abrash-black-book
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Replace invalid characters with HTML entities

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— with —
’ with ’
+ with +
× with x
ç with ç
“ with “
” with ”
‘ with ‘
• with •
– with -
µ with µ
† with †
Fix C++
θ with θ
Yen symbol instead of times
Fix broken apos
Bullet again
E-circumflex
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James Gregory 2013-12-30 12:50:32 +11:00
commit 500e7f5654
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16
36-04.html
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@ -36,13 +36,13 @@
</TABLE>
</CENTER>
<P><BR></P>
<P>Notwithstanding that it&#146;s not optimized, Listing 36.1 is reasonably fast. If you run Listing 36.2 (a sample line-drawing program that you can use to test-drive Listing 36.1), you may be as surprised as I was at how quickly the screen fills with vectors, considering that Listing 36.1 is entirely in C and has some redundant divides. Or perhaps you won&#146;t be surprised&#151;in which case I suggest you <I>not</I> miss the next chapter.</P>
<P>Notwithstanding that it&rsquo;s not optimized, Listing 36.1 is reasonably fast. If you run Listing 36.2 (a sample line-drawing program that you can use to test-drive Listing 36.1), you may be as surprised as I was at how quickly the screen fills with vectors, considering that Listing 36.1 is entirely in C and has some redundant divides. Or perhaps you won&rsquo;t be surprised&mdash;in which case I suggest you <I>not</I> miss the next chapter.</P>
<P><B>LISTING 36.2 L36-2.C</B></P>
<!-- CODE //-->
<PRE>
/* Sample line-drawing program. Uses the optimized
line-drawing functions coded in LListing L36.1.C.
Tested with Borland C&#43;&#43; in the small model. */
Tested with Borland C++ in the small model. */
#include &ltdos.h&gt
@ -66,27 +66,27 @@ int Color; /* color to draw lines in */
/* lines from center to top of rectangle */
WorkingX = XCenter - XLength;
WorkingY = YCenter - YLength;
for ( ; WorkingX &lt ( XCenter &#43; XLength ); WorkingX&#43;&#43; )
for ( ; WorkingX &lt ( XCenter + XLength ); WorkingX++ )
{
LineDraw(XCenter, YCenter, WorkingX, WorkingY, Color);
}
/* lines from center to right of rectangle */
WorkingX = XCenter &#43; XLength - 1;
WorkingX = XCenter + XLength - 1;
WorkingY = YCenter - YLength;
for ( ; WorkingY &lt ( YCenter &#43; YLength ); WorkingY&#43;&#43; )
for ( ; WorkingY &lt ( YCenter + YLength ); WorkingY++ )
{
LineDraw(XCenter, YCenter, WorkingX, WorkingY, Color);
}
/* lines from center to bottom of rectangle */
WorkingX = XCenter &#43; XLength - 1;
WorkingY = YCenter &#43; YLength - 1;
WorkingX = XCenter + XLength - 1;
WorkingY = YCenter + YLength - 1;
for ( ; WorkingX &gt= ( XCenter - XLength ); WorkingX-- )
{
LineDraw(XCenter, YCenter, WorkingX, WorkingY, Color);
}
/* lines from center to left of rectangle */
WorkingX = XCenter - XLength;
WorkingY = YCenter &#43; YLength - 1;
WorkingY = YCenter + YLength - 1;
for ( ; WorkingY &gt= ( YCenter - YLength ); WorkingY-- )
{
LineDraw(XCenter, YCenter, WorkingX, WorkingY, Color);