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<!doctype HTML PUBLIC "-//IETF//DTD HTML//EN">
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<head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>CD_EMF</title>
<link rel="stylesheet" type="text/css" href="../../style.css">
</head>
<body>
<h2>CD_EMF - Enhanced Metafile Driver (cdemf.h)</h2>
<p>This driver allows generating a Microsoft Windows Enhanced Metafile, the
format used by 32-bit Windows systems to store graphics primitives. Usually,
the filename has an extension "*.emf".</p>
<p>The driver works only in the Microsoft Windows platform, but you can use it
in other platforms without the risk of compilation error. If you attempt to
create a canvas in another platform, function <font face="Courier"><strong>
cdCreateCanvas</strong></font> will return NULL.</p>
<h3>Use</h3>
<p>The canvas is created by means of a call to function <font face="Courier">
<a href="../func/init.html#cdCreateCanvas">
<strong>cdCreateCanvas</strong></a>(CD_EMF, Data)</font>, after which other CD
functions can be called as usual. Parameter <font face="Courier">Data</font>
has the following format:</p>
<pre><em>"filename widthxheight" </em>or in C <em>"<strong><tt>%s %dx%d</tt></strong>"</em></pre>
<p>It must include the filename and the canvas' dimensions.<font face="Courier">
</font>The filename must be inside double quotes (") if it has spaces.<font face="Courier">
Width</font> and <font face="Courier">height</font> are provided in pixels
(note the lowercase "x" between them). Resolution (the number of pixels per
millimeter) is always the screen resolution.</p>
<p>Any amount of such canvases may exist simultaneously. Function
<font face="Courier"><strong>cdCreateCanvas</strong></font> <b>opens</b> the
file, and a call to function
<a href="../func/init.html#cdKillCanvas">
<font face="Courier"><strong>cdKillCanvas</strong></font></a> is required to
<b>close</b> the file properly.</p>
<p>To use this driver in Windows using GDI+ is necessary to call
<font face="Courier"><strong>
cdUseContextPlus</strong></font><strong><font face="Courier">(1)</font></strong>
before creating the canvas. If you intend to use <strong>cdCanvasPlay</strong>
to interpret the EMF, then do not use GDI+ to generate the metafile. GDI+
extensively use internal transformations that will affect the <strong>
cdCanvasPlay</strong> interpretation. Also some interior style will not be
correctly interpreted.</p>
<h3>Behavior of Functions</h3>
<p>This driver is greatly platform-dependent. For further detail, see the <b>
Behavior of Functions</b> of the <a href="win32.html">Microsoft Windows (GDI)</a>
or <a href="gdiplus.html">Windows Using GDI+</a> platform base drivers. It has
been noticed that EMF, when saved in the Windows 95 environment, is not
totally compatible with EMF saved in the Windows NT environment.</p>
<h4>Control Functions</h4>
<ul>
<li><a href="../func/other.html#cdPlay">
<font face="Courier"><strong>Play</strong></font></a>: different from the
basic driver, is implemented. Not implemented using GDI+.</li>
<li>
<a href="../func/control.html#cdClear">
<font face="Courier"><strong>Clear</strong></font></a>: different from the
basic driver, does nothing.</li>
</ul>
<h4>Client Images </h4>
<ul>
<li>
<a href="../func/client.html#cdGetImageRGB">
<font face="Courier"><strong>GetImageRGB</strong></font></a>: does nothing.</li>
</ul>
<h4>Server Images</h4>
<ul>
<li>All functions do nothing.</li>
</ul>
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