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<h2 align="center">System</h2>
<pre class="function"><span class="mainFunction">char* <a name="cdVersion">cdVersion</a>(void); [in C]</span>
cd.Version() -> (version: string) [in Lua]</pre>
<p>Returns the current version number of the library. The string with the
version number has a format "<font>major.minor.build</font>".
For instance, the string "2.1.3" has number 2 as the main (major) version
number, 1 as the secondary (minor) version number, and 3 as the build number.
The major version number represents a change in the structure or behavior of
functions; the minor version number represents one or more new drivers and
functions added to the library; and the build version number represents one or
more corrected bugs.</p>
<pre class="function"><span class="mainFunction">char* cdVersionDate(void); [in C]
</span>
cd.VersionDate() -> (versiondate: string) [in Lua]</pre>
<p>Returns the release date of the current version of the library.</p>
<pre class="function"><span class="mainFunction">int cdVersionNumber(void); [in C]
</span>
cd.VersionNumber() -> (version: number) [in Lua]</pre>
<p>Returns the current version number of the library.</p>
<pre class="function">[in C]
<span class="mainFunction">CD_NAME</span> "CD - Canvas Draw"
<span class="mainFunction">CD_DESCRIPTION</span> "A 2D Graphics Library"
<span class="mainFunction">CD_COPYRIGHT</span> "Copyright (C) 1994-2007 Tecgraf/PUC-Rio and PETROBRAS S/A"
<span class="mainFunction">CD_VERSION</span> "5.0"
<span class="mainFunction">CD_VERSION_DATE</span> "2007/04/09"
<span class="mainFunction">CD_VERSION_NUMBER</span> 500000
[in Lua]
cd._NAME
cd._DESCRIPTION
cd._COPYRIGHT
cd._VERSION
cd._VERSION_DATE
cd._VERSION_NUMBER</pre>
<p>Usefull definitions. They have the same value returned by <b>cdVersion</b>*
functions, except that they do not include the build number.</p>
<hr>
<h2 align="center">Metafile Interpretation</h2>
<pre class="function"><span class="mainFunction">int cdCanvasPlay(cdCanvas* canvas, cdContext* ctx, int xmin, int xmax, int ymin, int ymax, void *data); [in C]</span>
canvas:Play(ctx, xmin, xmax, ymin, ymax: number, data: string) -> (status: number) [in Lua]</pre>
<p>Interprets the graphical contents (primitives and attributes) in a given
driver and calls equivalent functions of the CD library using the given
canvas. The primitives are drawn inside the region defined by the given
limits. If <font>limits are 0 (xmin</font>, <font>xmax</font>,
<font>ymin</font> and <font>ymax)</font> the primitives will be drawn with their coordinates having the original
values in the file. </p>
<p>Only some drivers implement this function:</p>
<ul>
<li><a href="../drv/clipbd.html"><b>
CD_CLIPBOARD</b></a> = Clipboard, <font>data</font> is
ignored. </li>
<li><a href="../drv/wmf.html"><b>
CD_WMF</b></a> = Windows Metafile, <font>data</font> is
a <b>char*</b> for the string ''<i>filename</i>''. Works only in
the MS Windows system.</li>
<li><a href="../drv/emf.html"><b>
CD_EMF</b></a> = Windows Enhanced Metafile, <font>data</font>
is a <b>char*</b> for the string ''<i>filename</i>''. Works only in
the MS Windows system.</li>
<li><a href="../drv/cgm.html"><b>
CD_CGM</b></a> = Computer Graphics Metafile ISO, <font>
data</font> is a <b>char*</b> for the string ''<i>filename</i>''.</li>
<li><a href="../drv/mf.html"><b>
CD_METAFILE</b></a> = CD Metafile, <font>data</font>
is a <b>char*</b> for the string ''<i>filename</i>''.</li>
<li><a href="../drv/picture.html"><b>
CD_PICTURE</b></a> = CD Picture, <font>data</font>
is a <strong>cdCanvas</strong><b>*</b> of the Picture canvas.</li>
</ul>
<pre class="function"><span class="mainFunction">int cdContextRegisterCallback(cdContext *ctx, int cb, int(*func)(cdCanvas* canvas, ...)); [in C]</span>
cd.ContextRegisterCallback(ctx, cb: number, func: function) -> (status: number) [in Lua]</pre>
<p>Used to customize the behavior of the <b><font>Play</font></b>
function. If you register a known callback function, it will be called during
the processing loop of <font>cdPlay</font>.</p>
<p>The callback should return <font>CD_CONTINUE</font>, if it
returns <font>CD_ABORT</font>, the <font>cdPlay</font>
function is aborted. The callback identifiers of a given driver must be in the
header file relative to that driver, with prefix "<font>CD_XXYYYCB</font>",
where <font>XX</font> identifies that driver and
<font>YYY</font> identifies the callback name.</p>
<p>There is a default callback common to all implementations of
<font>cdPlay</font>, <b>CD_SIZECB</b>. Its definition
is:</p>
<pre>int cdResizeCB(cdCanvas* canvas, int width, int height, double mm_width, double mm_height)</pre>
<p>It returns the size of the image in the
file before any function in the CD library is called, so that you can call the
<font>cdPlay</font> function without an active canvas and
create the canvas inside the callback. It works as a <b>
<font>cdCanvasGetSize</font></b> function.</p>
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