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authorDavid Thompson <dthompson2@worcester.edu>2023-12-28 11:23:49 -0500
committerDavid Thompson <dthompson2@worcester.edu>2023-12-28 11:23:49 -0500
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Delete manuals!
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-<title>Getting Started (The Chickadee Game Toolkit)</title>
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-<span id="Getting-Started"></span><div class="header">
-<p>
-Next: <a href="Command-Line-Interface.html" accesskey="n" rel="next">Command Line Interface</a>, Previous: <a href="Installation.html" accesskey="p" rel="prev">Installation</a>, Up: <a href="index.html" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
-</div>
-<hr />
-<span id="Getting-Started-1"></span><h2 class="chapter">2 Getting Started</h2>
-
-<p>One of the simplest programs we can make with Chickadee is rendering
-the text &ldquo;Hello, world&rdquo; on screen. Here&rsquo;s what that looks like:
-</p>
-<div class="lisp">
-<pre class="lisp"><span class="syntax-open">(</span><span class="syntax-special">define</span> <span class="syntax-open">(</span><span class="syntax-symbol">draw</span> <span class="syntax-symbol">alpha</span><span class="syntax-close">)</span>
- <span class="syntax-open">(</span><span class="syntax-symbol">draw-text</span> <span class="syntax-string">"Hello, world!"</span> <span class="syntax-open">(</span><span class="syntax-symbol">vec2</span> <span class="syntax-symbol">64.0</span> <span class="syntax-symbol">240.0</span><span class="syntax-close">)</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-</pre></div>
-
-<p>The <code>draw</code> procedure is called frequently to draw the game scene.
-For the sake of simplicity, we will ignore the <code>alpha</code> variable
-in this tutorial.
-</p>
-<p>To run this program, we&rsquo;ll use the <code>chickadee play</code> command:
-</p>
-<div class="example">
-<pre class="example">chickadee play hello.scm
-</pre></div>
-
-<p>This is a good start, but it&rsquo;s boring. Let&rsquo;s make the text move!
-</p>
-<div class="lisp">
-<pre class="lisp"><span class="syntax-open">(</span><span class="syntax-special">define</span> <span class="syntax-symbol">position</span> <span class="syntax-open">(</span><span class="syntax-symbol">vec2</span> <span class="syntax-symbol">0.0</span> <span class="syntax-symbol">240.0</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-
-<span class="syntax-open">(</span><span class="syntax-special">define</span> <span class="syntax-open">(</span><span class="syntax-symbol">draw</span> <span class="syntax-symbol">alpha</span><span class="syntax-close">)</span>
- <span class="syntax-open">(</span><span class="syntax-symbol">draw-text</span> <span class="syntax-string">"Hello, world!"</span> <span class="syntax-symbol">position</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-
-<span class="syntax-open">(</span><span class="syntax-special">define</span> <span class="syntax-open">(</span><span class="syntax-symbol">update</span> <span class="syntax-symbol">dt</span><span class="syntax-close">)</span>
- <span class="syntax-open">(</span><span class="syntax-symbol">set-vec2-x!</span> <span class="syntax-symbol">position</span> <span class="syntax-open">(</span><span class="syntax-symbol">+</span> <span class="syntax-open">(</span><span class="syntax-symbol">vec2-x</span> <span class="syntax-symbol">position</span><span class="syntax-close">)</span> <span class="syntax-open">(</span><span class="syntax-symbol">*</span> <span class="syntax-symbol">100.0</span> <span class="syntax-symbol">dt</span><span class="syntax-close">)</span><span class="syntax-close">)</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-</pre></div>
-
-<p>The <code>vec2</code> type is used to store 2D coordinates
-(see <a href="Vectors.html">Vectors</a>.) A variable named <code>position</code> contains the
-position where the text should be rendered. A new hook called
-<code>update</code> has been added to handle the animation. This hook is
-called frequently to update the state of the game. The variable
-<code>dt</code> (short for &ldquo;delta-time&rdquo;) contains the amount of time that
-has passed since the last update, in seconds. Putting it all
-together, this update procedure is incrementing the x coordinate of
-the position by 100 pixels per second.
-</p>
-<p>This is neat, but after a few seconds the text moves off the screen
-completely, never to be seen again. It would be better if the text
-bounced back and forth against the sides of the window.
-</p>
-<div class="lisp">
-<pre class="lisp"><span class="syntax-open">(</span><span class="syntax-special">define</span> <span class="syntax-symbol">position</span> <span class="syntax-open">(</span><span class="syntax-symbol">vec2</span> <span class="syntax-symbol">0.0</span> <span class="syntax-symbol">240.0</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-
-<span class="syntax-open">(</span><span class="syntax-special">define</span> <span class="syntax-open">(</span><span class="syntax-symbol">draw</span> <span class="syntax-symbol">alpha</span><span class="syntax-close">)</span>
- <span class="syntax-open">(</span><span class="syntax-symbol">draw-text</span> <span class="syntax-string">"Hello, world!"</span> <span class="syntax-symbol">position</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-
-<span class="syntax-open">(</span><span class="syntax-special">define</span> <span class="syntax-open">(</span><span class="syntax-symbol">update</span> <span class="syntax-symbol">dt</span><span class="syntax-close">)</span>
- <span class="syntax-open">(</span><span class="syntax-symbol">update-agenda</span> <span class="syntax-symbol">dt</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-
-<span class="syntax-open">(</span><span class="syntax-special">define</span> <span class="syntax-open">(</span><span class="syntax-symbol">update-x</span> <span class="syntax-symbol">x</span><span class="syntax-close">)</span>
- <span class="syntax-open">(</span><span class="syntax-symbol">set-vec2-x!</span> <span class="syntax-symbol">position</span> <span class="syntax-symbol">x</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-
-<span class="syntax-open">(</span><span class="syntax-special">let</span> <span class="syntax-open">(</span><span class="syntax-open">(</span><span class="syntax-symbol">start</span> <span class="syntax-symbol">0.0</span><span class="syntax-close">)</span>
- <span class="syntax-open">(</span><span class="syntax-symbol">end</span> <span class="syntax-symbol">536.0</span><span class="syntax-close">)</span>
- <span class="syntax-open">(</span><span class="syntax-symbol">duration</span> <span class="syntax-symbol">4.0</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
- <span class="syntax-open">(</span><span class="syntax-symbol">script</span>
- <span class="syntax-open">(</span><span class="syntax-symbol">while</span> <span class="syntax-symbol">#t</span>
- <span class="syntax-open">(</span><span class="syntax-symbol">tween</span> <span class="syntax-symbol">duration</span> <span class="syntax-symbol">start</span> <span class="syntax-symbol">end</span> <span class="syntax-symbol">update-x</span><span class="syntax-close">)</span>
- <span class="syntax-open">(</span><span class="syntax-symbol">tween</span> <span class="syntax-symbol">duration</span> <span class="syntax-symbol">end</span> <span class="syntax-symbol">start</span> <span class="syntax-symbol">update-x</span><span class="syntax-close">)</span><span class="syntax-close">)</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-</pre></div>
-
-<p>This final example uses Chickadee&rsquo;s scripting features
-(see <a href="Scripting.html">Scripting</a>) to bounce the text between the edges of the window
-indefinitely using the handy <code>tween</code> procedure. The only thing
-the <code>update</code> procedure needs to do now is advance the clock of
-the &ldquo;agenda&rdquo; (the thing that runs scripts.) The script takes care
-of the rest.
-</p>
-<p>This quick tutorial has hopefully given you a taste of what you can do
-with Chickadee. The rest of this manual gets into all of the details
-that were glossed over, and much more. Try rendering a sprite,
-playing a sound effect, or handling keyboard input. But most
-importantly: Have fun!
-</p>
-<hr />
-<div class="header">
-<p>
-Next: <a href="Command-Line-Interface.html" accesskey="n" rel="next">Command Line Interface</a>, Previous: <a href="Installation.html" accesskey="p" rel="prev">Installation</a>, Up: <a href="index.html" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
-</div>
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