wztutorial.html

Delaunay三角形的网格剖分程序

<TITLE>WZ 1.1: Tutorial</TITLE>

<H1>Tutorial for WZ 1.1</H1>

 <P><B>WZ 1.0</B> is a C++ class library which contains useful general
purpose classes used in COG.  They are useful if you want to include
COG grids, points and geometries into your own code, but some of the
classes may be useful for you even outside the context of COG.

<H3><A HREF="mainwzproxytest.html">wzProxy</A></H3>

 <P>The template <B>wzProxy</B> implements safe pointers - they may be
used like pointers, but manage access control (deallocation):

<PRE>
typedef wzProxy&lt;Something&gt; something;
something a = new Something();
something b = 0;
a = b; // deallocates now
</PRE>

<H3><A HREF="mainwzarraytest.html">wzArray</A></H3>

 <P>The template <B>wzArray</B> implements infinite arrays with
automatical range test and allocation of additional memory if
necessary.  But it allows to do it in an economic way: if you fill the
array in increasing order, new memory will be allocated more than
actually required, but therefore not in every step but seldom. It also
allows you to decide if the check should be made or not:

<PRE>
  wzArray&lt;int&gt; x;
  for(i=0;i&lt;n;i++){
    x(i) = n;  // tests if x[i] is allocated, reallocates sometimes;
    y += x[i]; // we already know x[i] is allocated - no need to test again;
  }
</PRE>

<H3><A HREF="mainwzrangetest.html">wzRange</A></H3>

 <P>The class <B>wzRange</B> allows to manage loops over variable
ranges (like the nodes and cells during grid generation) and manages
the allocation of memory for related arrays:

<PRE>
 wzRange range;  wzIndex i;
 wzArray&lt;int&gt; a(range);
 range.create(100);  // allocates memory for a too.
 wzRangeLoop(range,i){  // loop over the range with index i;
  	a[i] = i;
 }
</PRE>

<H3><A HREF="mainwzcomponenttest.html">wzComponent</A></H3>

 <P>allows to replace public components so that external access syntax
to components remains unchanged but internally more complex things can
be done at every read and write access.

<H3><A HREF="mainwzsegmenttest.html">wzSegment</A></H3>

 <P>This class handles region and face identifiers (they can have
names, colors, materials)

<H3><A HREF="mainwzpointtest.html">wzPoint</A></H3>

 <P>A basic class for COG.  The point contains coordinates,
a segment, and some function values.

<H3><A HREF="mainwzoutputtest.html">Formatted Output</A></H3>

 <P>allows formatted output using C++ type control possibilities (no
need to use C-format things like <I>%d, %f</I> and so on) with a
simple <I>&lt;&gt;</I> as the default placeholder, allows to fix its
size as n with <I>&lt;n&gt;</I>, and nice syntax:

<PRE>
  wzOutput p(cerr);
  wzIndex a=1; wzFloat b=1; wzName c = "name";
  p("a = &lt;&gt;, b = &lt;&gt;, name = &lt;&gt;") &lt;&lt;a,b,name;
</PRE>

<H3><A HREF="mainwzwarningtest.html">wzWarning</A></H3>

 <P>This type allows to manage warnings.  The default behaviour is
that it will be written out only once, searches explanatory text from
the documentation, and at the end prints a summary how often it has
been called.

<H3><A HREF="mainwzpixmaptest.html">Pixmaps</A></H3>

 <P>A class which allows to read and use pixmaps (currently only PPM).

<H3><A HREF="mainwzmaptest.html">Coordinates</A></H3>

 <P>Describes how coordinates have to be used.