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[sdlgit/SDL-Site.git] / pages / SDL-Tutorial.html-inc

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<!-- INDEX START -->
<h3 id="TOP">Index</h3>

<ul><li><a href="#NAME">NAME</a>
<ul><li><a href="#CATEGORY">CATEGORY</a></li>
</ul>
</li>
<li><a href="#SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#SDL_BASICS">SDL BASICS</a>
<ul><li><a href="#Surfaces">Surfaces</a></li>
<li><a href="#Initialization">Initialization</a></li>
<li><a href="#Working_With_The_App">Working With The App</a></li>
</ul>
</li>
<li><a href="#SEE_ALSO">SEE ALSO</a></li>
<li><a href="#AUTHOR">AUTHOR</a></li>
<li><a href="#COPYRIGHT">COPYRIGHT</a>
</li>
</ul><hr />
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<h1 id="NAME">NAME</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="NAME_CONTENT">
<p>SDL::Tutorial - introduction to Perl SDL</p>

</div>
<h2 id="CATEGORY">CATEGORY</h2>
<div id="CATEGORY_CONTENT">
<p>Tutorials</p>

</div>
<h1 id="SYNOPSIS">SYNOPSIS</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="SYNOPSIS_CONTENT">
<pre>	# to read this tutorial
	$ perldoc SDL::Tutorial

	# to create a bare-bones SDL app based on this tutorial
	$ perl -MSDL::Tutorial -e 1

</pre>

</div>
<h1 id="SDL_BASICS">SDL BASICS</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="SDL_BASICS_CONTENT">
<p>SDL, the Simple DirectMedia Layer, is a cross-platform multimedia library.
These are the Perl 5 bindings.  You can find out more about SDL at
<a href="http://www.libsdl.org/">http://www.libsdl.org/</a>.</p>
<p>Creating an SDL application with Perl is easy.  You have to know a few basics,
though.  Here's how to get up and running as quickly as possible.</p>

</div>
<h2 id="Surfaces">Surfaces</h2>
<div id="Surfaces_CONTENT">
<p>All graphics in SDL live on a surface.  You'll need at least one.  That's what
<a href="SDL-App.html">SDL::App</a> provides.</p>
<p>Of course, before you can get a surface, you need to initialize your video
mode.  SDL gives you several options, including whether to run in a window or
take over the full screen, the size of the window, the bit depth of your
colors, and whether to use hardware acceleration.  For now, we'll build
something really simple.</p>

</div>
<h2 id="Initialization">Initialization</h2>
<div id="Initialization_CONTENT">
<p>SDL::App makes it easy to initialize video and create a surface.  Here's how to
ask for a windowed surface with 640x480x16 resolution:</p>
<pre>	use SDL::App;

	my $app = SDL::App-&gt;new(
		-width  =&gt; 640,
		-height =&gt; 480,
		-depth  =&gt; 16,
	);

</pre>
<p>You can get more creative, especially if you use the <code>-title</code> and <code>-icon</code>
attributes in a windowed application.  Here's how to set the window title of
the application to <code>My SDL Program</code>:</p>
<pre>	use SDL::App;

	my $app = SDL::App-&gt;new(
		-height =&gt; 640,
		-width  =&gt; 480,
		-depth  =&gt; 16,
		-title  =&gt; 'My SDL Program',
	);

</pre>
<p>Setting an icon is a little more involved -- you have to load an image onto a
surface.  That's a bit more complicated, but see the <code>-name</code> parameter to
<code>SDL::Surface-</code>new()&gt; if you want to skip ahead.</p>

</div>
<h2 id="Working_With_The_App">Working With The App</h2>
<div id="Working_With_The_App_CONTENT">
<p>Since <code>$app</code> from the code above is just an SDL surface with some extra sugar,
it behaves much like <a href="SDL-Surface.html">SDL::Surface</a>.  In particular, the all-important <code>blit</code>
and <code>update</code> methods work.  You'll need to create <a href="SDL-Rect.html">SDL::Rect</a> objects
representing sources of graphics to draw onto the <code>$app</code>'s surface, <code>blit</code>
them there, then <code>update</code> the <code>$app</code>.</p>
<p><strong>Note:</strong>  &quot;blitting&quot; is copying a chunk of memory from one place to another.</p>
<p>That, however, is another tutorial.</p>

</div>
<h1 id="SEE_ALSO">SEE ALSO</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="SEE_ALSO_CONTENT">
<dl>
	<dt><a href="SDL-Tutorial-Drawing.html">SDL::Tutorial::Drawing</a></dt>
	<dd>
		<p>basic drawing with rectangles</p>
	</dd>
	<dt><a href="SDL-Tutorial-Animation.html">SDL::Tutorial::Animation</a></dt>
	<dd>
		<p>basic rectangle animation</p>
	</dd>
	<dt><a href="SDL-Tutorial-Images.html">SDL::Tutorial::Images</a></dt>
	<dd>
		<p>image loading and animation</p>
	</dd>
</dl>

</div>
<h1 id="AUTHOR">AUTHOR</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="AUTHOR_CONTENT">
<p>chromatic, &lt;chromatic@wgz.org&gt;.  </p>
<p>Written for and maintained by the Perl SDL project, <a href="http://sdl.perl.org/">http://sdl.perl.org/</a>.</p>

</div>
<h1 id="COPYRIGHT">COPYRIGHT</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="COPYRIGHT_CONTENT">
<p>Copyright (c) 2003 - 2004, chromatic.  All rights reserved.  This module is
distributed under the same terms as Perl itself, in the hope that it is useful
but certainly under no guarantee.
</p>

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