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author: David Thompson <dthompson2@worcester.edu> 2023-12-28 11:23:49 -0500
committer: David Thompson <dthompson2@worcester.edu> 2023-12-28 11:23:49 -0500
commit: 25c5eac5e6ca1035db1eddd7bea9ac78531da57e (patch)
tree: 96377006bbfee75bcf0ce208c1ef89cbdfa5b803 /manuals/chickadee/Agendas.html
parent: 5b2e467a7e5e2ffbb0cbbf2557283be891d8206b (diff)
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-<title>Agendas (The Chickadee Game Toolkit)</title>
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-<span id="Agendas"></span><div class="header">
-<p>
-Next: <a href="Scripts.html" accesskey="n" rel="next">Scripts</a>, Up: <a href="Scripting.html" accesskey="u" rel="up">Scripting</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="Agendas-1"></span><h4 class="subsection">5.5.1 Agendas</h4>
-
-<p>To schedule a task to be performed later, an &ldquo;agenda&rdquo; is used.
-There is a default, global agenda that is ready to be used, or
-additional agendas may be created for different purposes.  The
-following example prints the text &ldquo;hello&rdquo; when the agenda has
-advanced to time unit 10.
-</p>
-<div class="lisp">
-<pre class="lisp"><span class="syntax-open">(</span><span class="syntax-symbol">at</span> <span class="syntax-symbol">10</span> <span class="syntax-open">(</span><span class="syntax-symbol">display</span> <span class="syntax-string">"hello\n"</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-</pre></div>
-
-<p>Most of the time it is more convenient to schedule tasks relative to
-the current time.  This is where <code>after</code> comes in handy:
-</p>
-<div class="lisp">
-<pre class="lisp"><span class="syntax-open">(</span><span class="syntax-symbol">after</span> <span class="syntax-symbol">10</span> <span class="syntax-open">(</span><span class="syntax-symbol">display</span> <span class="syntax-string">"hello\n"</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-</pre></div>
-
-<p>Time units in the agenda are in no way connected to real time.  It&rsquo;s
-up to the programmer to decide what agenda time means.  A simple and
-effective approach is to map each call of the update procedure
-(see <a href="Kernel.html">Kernel</a>) to 1 unit of agenda time, like so:
-</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">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">1</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-</pre></div>
-
-<p>It is important to call <code>update-agenda</code> periodically, otherwise
-no tasks will ever be run!
-</p>
-<p>In addition to using the global agenda, it is useful to have multiple
-agendas for different purposes.  For example, the game world can use a
-different agenda than the user interface, so that pausing the game is
-a simple matter of not updating the world&rsquo;s agenda while continuing to
-update the user interface&rsquo;s agenda.  The current agenda is dynamically
-scoped and can be changed using the <code>with-agenda</code> special form:
-</p>
-<div class="lisp">
-<pre class="lisp"><span class="syntax-open">(</span><span class="syntax-special">define</span> <span class="syntax-symbol">game-world-agenda</span> <span class="syntax-open">(</span><span class="syntax-symbol">make-agenda</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-
-<span class="syntax-open">(</span><span class="syntax-symbol">with-agenda</span> <span class="syntax-symbol">game-world-agenda</span>
-  <span class="syntax-open">(</span><span class="syntax-symbol">at</span> <span class="syntax-symbol">60</span> <span class="syntax-open">(</span><span class="syntax-symbol">spawn-goblin</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-  <span class="syntax-open">(</span><span class="syntax-symbol">at</span> <span class="syntax-symbol">120</span> <span class="syntax-open">(</span><span class="syntax-symbol">spawn-goblin</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-  <span class="syntax-open">(</span><span class="syntax-symbol">at</span> <span class="syntax-symbol">240</span> <span class="syntax-open">(</span><span class="syntax-symbol">spawn-goblin-king</span><span class="syntax-close">)</span><span class="syntax-close">)</span><span class="syntax-close">)</span>
-</pre></div>
-
-<dl>
-<dt id="index-make_002dagenda">Procedure: <strong>make-agenda</strong></dt>
-<dd><p>Return a new task scheduler.
-</p></dd></dl>
-
-<dl>
-<dt id="index-agenda_003f">Procedure: <strong>agenda?</strong> <em>obj</em></dt>
-<dd><p>Return <code>#t</code> if <var>obj</var> is an agenda.
-</p></dd></dl>
-
-<dl>
-<dt id="index-current_002dagenda">Procedure: <strong>current-agenda</strong></dt>
-<dt id="index-current_002dagenda-1">Procedure: <strong>current-agenda</strong> <em>agenda</em></dt>
-<dd><p>When called with no arguments, return the current agenda.  When called
-with one argument, set the current agenda to <var>agenda</var>.
-</p></dd></dl>
-
-<dl>
-<dt id="index-with_002dagenda">Syntax: <strong>with-agenda</strong> <em>agenda body &hellip;</em></dt>
-<dd><p>Evaluate <var>body</var> with the current agenda set to <var>agenda</var>.
-</p></dd></dl>
-
-<dl>
-<dt id="index-agenda_002dtime">Procedure: <strong>agenda-time</strong></dt>
-<dd><p>Return the current agenda time.
-</p></dd></dl>
-
-<dl>
-<dt id="index-update_002dagenda">Procedure: <strong>update-agenda</strong> <em>dt</em></dt>
-<dd><p>Advance the current agenda by <var>dt</var>.
-</p></dd></dl>
-
-<dl>
-<dt id="index-schedule_002dat">Procedure: <strong>schedule-at</strong> <em>time thunk</em></dt>
-<dd><p>Schedule <var>thunk</var>, a procedure of zero arguments, to be run at
-<var>time</var>.
-</p></dd></dl>
-
-<dl>
-<dt id="index-schedule_002dafter">Procedure: <strong>schedule-after</strong> <em>delay thunk</em></dt>
-<dd><p>Schedule <var>thunk</var>, a procedure of zero arguments, to be run after
-<var>delay</var>.
-</p></dd></dl>
-
-<dl>
-<dt id="index-schedule_002devery">Procedure: <strong>schedule-every</strong> <em>interval thunk [n]</em></dt>
-<dd><p>Schedule <var>thunk</var>, a procedure of zero arguments, to be run every
-<var>interval</var> amount of time.  Repeat this <var>n</var> times, or
-indefinitely if not specified.
-</p></dd></dl>
-
-<dl>
-<dt id="index-at">Syntax: <strong>at</strong> <em>time body &hellip;</em></dt>
-<dd><p>Schedule <var>body</var> to be evaluated at <var>time</var>.
-</p></dd></dl>
-
-<dl>
-<dt id="index-after">Syntax: <strong>after</strong> <em>delay body &hellip;</em></dt>
-<dd><p>Schedule <var>body</var> to be evaluated after <var>delay</var>.
-</p></dd></dl>
-
-<dl>
-<dt id="index-every">Syntax: <strong>every</strong> <em>interval body &hellip;</em></dt>
-<dt id="index-every-1">Syntax: <strong>every</strong> <em>(interval n) body &hellip;</em></dt>
-<dd><p>Schedule <var>body</var> to be evaluated every <var>interval</var> amount of
-time.  Repeat this <var>n</var> times, or indefinitely if not specified.
-</p></dd></dl>
-
-<p>It is also possible to schedule things that are not dependent on how
-much time passes.  The agenda will periodically poll to see if any
-registered conditions are met.
-</p>
-<dl>
-<dt id="index-call_002dwhen">Procedure: <strong>call-when</strong> <em>pred thunk</em></dt>
-<dd><p>Call <var>thunk</var> sometime in the future when <var>pred</var> is satisfied
-(returns a value other than <code>#f</code>.)
-</p></dd></dl>
-
-<hr />
-<div class="header">
-<p>
-Next: <a href="Scripts.html" accesskey="n" rel="next">Scripts</a>, Up: <a href="Scripting.html" accesskey="u" rel="up">Scripting</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>
-
-
-
-</body>
-</html>
author	David Thompson <dthompson2@worcester.edu>	2023-12-28 11:23:49 -0500
committer	David Thompson <dthompson2@worcester.edu>	2023-12-28 11:23:49 -0500
commit	25c5eac5e6ca1035db1eddd7bea9ac78531da57e (patch)
tree	96377006bbfee75bcf0ce208c1ef89cbdfa5b803 /manuals/chickadee/Agendas.html
parent	5b2e467a7e5e2ffbb0cbbf2557283be891d8206b (diff)