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Diffstat (limited to 'manuals/chickadee/Agendas.html')
| -rw-r--r-- | manuals/chickadee/Agendas.html | 66 |
1 files changed, 33 insertions, 33 deletions
diff --git a/manuals/chickadee/Agendas.html b/manuals/chickadee/Agendas.html index f6acd57..51be160 100644 --- a/manuals/chickadee/Agendas.html +++ b/manuals/chickadee/Agendas.html @@ -1,6 +1,6 @@ <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> -<!-- Copyright (C) 2017-2021 David Thompson davet@gnu.org +<!-- Copyright (C) 2017-2023 David Thompson dthompson2@worcester.edu Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 @@ -17,25 +17,25 @@ Foundation Web site at http://www.gnu.org/licenses/fdl.html. The document was typeset with http://www.texinfo.org/ (GNU Texinfo). - --> -<!-- Created by GNU Texinfo 6.7, http://www.gnu.org/software/texinfo/ --> + --> +<!-- Created by GNU Texinfo 6.7, http://www.gnu.org/software/texinfo/ --> <head> -<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Agendas (The Chickadee Game Toolkit)</title> -<meta name="description" content="Agendas (The Chickadee Game Toolkit)"> -<meta name="keywords" content="Agendas (The Chickadee Game Toolkit)"> -<meta name="resource-type" content="document"> -<meta name="distribution" content="global"> -<meta name="Generator" content="makeinfo"> -<link href="index.html" rel="start" title="Top"> -<link href="Index.html" rel="index" title="Index"> -<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> -<link href="Scripting.html" rel="up" title="Scripting"> -<link href="Scripts.html" rel="next" title="Scripts"> -<link href="Scripting.html" rel="prev" title="Scripting"> +<meta name="description" content="Agendas (The Chickadee Game Toolkit)" /> +<meta name="keywords" content="Agendas (The Chickadee Game Toolkit)" /> +<meta name="resource-type" content="document" /> +<meta name="distribution" content="global" /> +<meta name="Generator" content="makeinfo" /> +<link href="index.html" rel="start" title="Top" /> +<link href="Index.html" rel="index" title="Index" /> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents" /> +<link href="Scripting.html" rel="up" title="Scripting" /> +<link href="Scripts.html" rel="next" title="Scripts" /> +<link href="Scripting.html" rel="prev" title="Scripting" /> <style type="text/css"> -<!-- +<!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} div.display {margin-left: 3.2em} @@ -72,9 +72,9 @@ ul.no-bullet {list-style: none} } } ---> +--> </style> -<link rel="stylesheet" type="text/css" href="https://dthompson.us/css/dthompson.css"> +<link rel="stylesheet" type="text/css" href="https://dthompson.us/css/dthompson.css" /> </head> @@ -84,7 +84,7 @@ ul.no-bullet {list-style: none} <p> Next: <a href="Scripts.html" accesskey="n" rel="next">Scripts</a>, Up: <a href="Scripting.html" accesskey="u" rel="up">Scripting</a> [<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> +<hr /> <span id="Agendas-1"></span><h4 class="subsection">5.5.1 Agendas</h4> <p>To schedule a task to be performed later, an “agenda” is used. @@ -93,15 +93,15 @@ additional agendas may be created for different purposes. The following example prints the text “hello” when the agenda has advanced to time unit 10. </p> -<div class="example"> -<pre class="example">(at 10 (display "hello\n")) +<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="example"> -<pre class="example">(after 10 (display "hello\n")) +<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’s @@ -109,9 +109,9 @@ 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="example"> -<pre class="example">(define (update dt) - (update-agenda 1)) +<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 @@ -124,13 +124,13 @@ a simple matter of not updating the world’s agenda while continuing to update the user interface’s agenda. The current agenda is dynamically scoped and can be changed using the <code>with-agenda</code> special form: </p> -<div class="example"> -<pre class="example">(define game-world-agenda (make-agenda)) +<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> -(with-agenda game-world-agenda - (at 60 (spawn-goblin)) - (at 120 (spawn-goblin)) - (at 240 (spawn-goblin-king))) +<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> @@ -211,7 +211,7 @@ registered conditions are met. (returns a value other than <code>#f</code>.) </p></dd></dl> -<hr> +<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> [<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> |