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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>1 HtDP Teachpacks</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_0");">►</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x"><span style="font-style: italic">How to Design Programs</span> Teachpacks</a></td></tr></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Ht<span class="mywbr"> </span>DP Teachpacks</a></td></tr><tr><td align="right">2 </td><td><a href="2htdp2htdp.html" class="tocviewlink" data-pltdoc="x">Ht<span class="mywbr"> </span>DP/<span class="mywbr"> </span>2e Teachpacks</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_1");">▼</a></td><td>1 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Ht<span class="mywbr"> </span>DP Teachpacks</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">1.1 </td><td><a href="image.html" class="tocviewlink" data-pltdoc="x">Manipulating Images:<span class="mywbr"> </span> <span class="stt">"image.rkt"</span><a name="(idx._(gentag._0._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.2 </td><td><a href="world.html" class="tocviewlink" data-pltdoc="x">Simulations and Animations:<span class="mywbr"> </span> <span class="stt">"world.rkt"</span><a name="(idx._(gentag._1._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.3 </td><td><a href="convert.html" class="tocviewlink" data-pltdoc="x">Converting Temperatures:<span class="mywbr"> </span> <span class="stt">"convert.rkt"</span><a name="(idx._(gentag._2._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.4 </td><td><a href="guess.html" class="tocviewlink" data-pltdoc="x">Guessing Numbers:<span class="mywbr"> </span> <span class="stt">"guess.rkt"</span><a name="(idx._(gentag._3._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.5 </td><td><a href="master.html" class="tocviewlink" data-pltdoc="x">Master<span class="mywbr"> </span>Minding:<span class="mywbr"> </span> <span class="stt">"master.rkt"</span><a name="(idx._(gentag._4._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.6 </td><td><a href="master-play.html" class="tocviewlink" data-pltdoc="x">Playing Master<span class="mywbr"> </span>Mind:<span class="mywbr"> </span> <span class="stt">"master-<wbr></wbr>play.rkt"</span><a name="(idx._(gentag._5._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.7 </td><td><a href="draw.html" class="tocviewlink" data-pltdoc="x">Simple Drawing:<span class="mywbr"> </span> <span class="stt">"draw.rkt"</span><a name="(idx._(gentag._6._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.8 </td><td><a href="hangman.html" class="tocviewlink" data-pltdoc="x">Hangman:<span class="mywbr"> </span> <span class="stt">"hangman.rkt"</span><a name="(idx._(gentag._7._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.9 </td><td><a href="hangman-play.html" class="tocviewlink" data-pltdoc="x">Playing Hangman:<span class="mywbr"> </span> <span class="stt">"hangman-<wbr></wbr>play.rkt"</span><a name="(idx._(gentag._8._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.10 </td><td><a href="arrow.html" class="tocviewlink" data-pltdoc="x">Managing Control Arrows:<span class="mywbr"> </span> <span class="stt">"arrow.rkt"</span><a name="(idx._(gentag._9._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.11 </td><td><a href="docs.html" class="tocviewlink" data-pltdoc="x">Manipulating Simple HTML Documents:<span class="mywbr"> </span> <span class="stt">"docs.rkt"</span><a name="(idx._(gentag._10._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.12 </td><td><a href="dir.html" class="tocviewlink" data-pltdoc="x">Working with Files and Directories:<span class="mywbr"> </span> <span class="stt">"dir.rkt"</span><a name="(idx._(gentag._11._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.13 </td><td><a href="graphing.html" class="tocviewlink" data-pltdoc="x">Graphing Functions:<span class="mywbr"> </span> <span class="stt">"graphing.rkt"</span><a name="(idx._(gentag._12._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.14 </td><td><a href="gui.html" class="tocviewlink" data-pltdoc="x">Simple Graphical User Interfaces:<span class="mywbr"> </span> <span class="stt">"gui.rkt"</span><a name="(idx._(gentag._13._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.15 </td><td><a href="arrow-gui.html" class="tocviewlink" data-pltdoc="x">An Arrow GUI:<span class="mywbr"> </span> <span class="stt">"arrow-<wbr></wbr>gui.rkt"</span><a name="(idx._(gentag._14._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.16 </td><td><a href="elevator.html" class="tocviewlink" data-pltdoc="x">Controlling an Elevator:<span class="mywbr"> </span> <span class="stt">"elevator.rkt"</span><a name="(idx._(gentag._15._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.17 </td><td><a href="lkup-gui.html" class="tocviewlink" data-pltdoc="x">Lookup GUI:<span class="mywbr"> </span> <span class="stt">"lkup-<wbr></wbr>gui.rkt"</span><a name="(idx._(gentag._16._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.18 </td><td><a href="guess-gui.html" class="tocviewlink" data-pltdoc="x">Guess GUI:<span class="mywbr"> </span> <span class="stt">"guess-<wbr></wbr>gui.rkt"</span><a name="(idx._(gentag._17._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.19 </td><td><a href="show-queen.html" class="tocviewlink" data-pltdoc="x">Queens:<span class="mywbr"> </span> <span class="stt">"show-<wbr></wbr>queen.rkt"</span><a name="(idx._(gentag._18._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr><tr><td align="right">1.20 </td><td><a href="matrix.html" class="tocviewlink" data-pltdoc="x">Matrix Functions:<span class="mywbr"> </span> <span class="stt">"matrix.rkt"</span><a name="(idx._(gentag._19._(lib._teachpack/teachpack..scrbl)))"></a></a></td></tr></table></div></div></div></div><div class="maincolumn"><div class="main"><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="index.html" title="backward to "How to Design Programs Teachpacks"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "How to Design Programs Teachpacks"" data-pltdoc="x">up</a> <a href="image.html" title="forward to "1.1 Manipulating Images: "image.rkt""" data-pltdoc="x">next →</a></span> </div><h3 x-source-module="(lib "teachpack/teachpack.scrbl")" x-part-tag=""htdp"">1<tt> </tt><a name="(part._htdp)"></a>HtDP Teachpacks</h3><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace"> </span><a href="image.html" class="toclink" data-pltdoc="x">1.1<span class="hspace"> </span>Manipulating Images: <span class="stt">"image.rkt"</span><a name="(idx._(gentag._0._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="image.html#%28part._.Images%29" class="toclink" data-pltdoc="x">1.1.1<span class="hspace"> </span>Images</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="image.html#%28part._modes-colors%29" class="toclink" data-pltdoc="x">1.1.2<span class="hspace"> </span>Modes and Colors</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="image.html#%28part._creational%29" class="toclink" data-pltdoc="x">1.1.3<span class="hspace"> </span>Creating Basic Shapes</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="image.html#%28part._properties%29" class="toclink" data-pltdoc="x">1.1.4<span class="hspace"> </span>Basic Image Properties</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="image.html#%28part._composition%29" class="toclink" data-pltdoc="x">1.1.5<span class="hspace"> </span>Composing Images</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="image.html#%28part._manipulation%29" class="toclink" data-pltdoc="x">1.1.6<span class="hspace"> </span>Manipulating Images</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="image.html#%28part._scenes%29" class="toclink" data-pltdoc="x">1.1.7<span class="hspace"> </span>Scenes</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="image.html#%28part._pixel-lists%29" class="toclink" data-pltdoc="x">1.1.8<span class="hspace"> </span>Miscellaneous Image Manipulation and Creation</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="world.html" class="toclink" data-pltdoc="x">1.2<span class="hspace"> </span>Simulations and Animations: <span class="stt">"world.rkt"</span><a name="(idx._(gentag._1._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="world.html#%28part._simulations%29" class="toclink" data-pltdoc="x">1.2.1<span class="hspace"> </span>Simple Simulations</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="world.html#%28part._interactive%29" class="toclink" data-pltdoc="x">1.2.2<span class="hspace"> </span>Interactions</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="world.html#%28part._example%29" class="toclink" data-pltdoc="x">1.2.3<span class="hspace"> </span>A First Example</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="world.html#%28part._.Understanding_a_.Door%29" class="toclink" data-pltdoc="x">1.2.3.1<span class="hspace"> </span>Understanding a Door</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="world.html#%28part._.Simulations_of_the_.World%29" class="toclink" data-pltdoc="x">1.2.3.2<span class="hspace"> </span>Simulations of the World</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="world.html#%28part._.Simulating_a_.Door__.Data%29" class="toclink" data-pltdoc="x">1.2.3.3<span class="hspace"> </span>Simulating a Door: Data</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="world.html#%28part._.Simulating_a_.Door__.Functions%29" class="toclink" data-pltdoc="x">1.2.3.4<span class="hspace"> </span>Simulating a Door: Functions</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="convert.html" class="toclink" data-pltdoc="x">1.3<span class="hspace"> </span>Converting Temperatures: <span class="stt">"convert.rkt"</span><a name="(idx._(gentag._2._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="guess.html" class="toclink" data-pltdoc="x">1.4<span class="hspace"> </span>Guessing Numbers: <span class="stt">"guess.rkt"</span><a name="(idx._(gentag._3._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="master.html" class="toclink" data-pltdoc="x">1.5<span class="hspace"> </span>MasterMinding: <span class="stt">"master.rkt"</span><a name="(idx._(gentag._4._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="master-play.html" class="toclink" data-pltdoc="x">1.6<span class="hspace"> </span>Playing MasterMind: <span class="stt">"master-play.rkt"</span><a name="(idx._(gentag._5._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="draw.html" class="toclink" data-pltdoc="x">1.7<span class="hspace"> </span>Simple Drawing: <span class="stt">"draw.rkt"</span><a name="(idx._(gentag._6._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="draw.html#%28part._drawing%29" class="toclink" data-pltdoc="x">1.7.1<span class="hspace"> </span>Drawing on a Canvas</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="draw.html#%28part._interaction%29" class="toclink" data-pltdoc="x">1.7.2<span class="hspace"> </span>Interactions with Canvas</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="hangman.html" class="toclink" data-pltdoc="x">1.8<span class="hspace"> </span>Hangman: <span class="stt">"hangman.rkt"</span><a name="(idx._(gentag._7._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="hangman-play.html" class="toclink" data-pltdoc="x">1.9<span class="hspace"> </span>Playing Hangman: <span class="stt">"hangman-play.rkt"</span><a name="(idx._(gentag._8._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="arrow.html" class="toclink" data-pltdoc="x">1.10<span class="hspace"> </span>Managing Control Arrows: <span class="stt">"arrow.rkt"</span><a name="(idx._(gentag._9._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="docs.html" class="toclink" data-pltdoc="x">1.11<span class="hspace"> </span>Manipulating Simple HTML Documents: <span class="stt">"docs.rkt"</span><a name="(idx._(gentag._10._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="dir.html" class="toclink" data-pltdoc="x">1.12<span class="hspace"> </span>Working with Files and Directories: <span class="stt">"dir.rkt"</span><a name="(idx._(gentag._11._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="graphing.html" class="toclink" data-pltdoc="x">1.13<span class="hspace"> </span>Graphing Functions: <span class="stt">"graphing.rkt"</span><a name="(idx._(gentag._12._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="gui.html" class="toclink" data-pltdoc="x">1.14<span class="hspace"> </span>Simple Graphical User Interfaces: <span class="stt">"gui.rkt"</span><a name="(idx._(gentag._13._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="arrow-gui.html" class="toclink" data-pltdoc="x">1.15<span class="hspace"> </span>An Arrow GUI: <span class="stt">"arrow-gui.rkt"</span><a name="(idx._(gentag._14._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="elevator.html" class="toclink" data-pltdoc="x">1.16<span class="hspace"> </span>Controlling an Elevator: <span class="stt">"elevator.rkt"</span><a name="(idx._(gentag._15._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="lkup-gui.html" class="toclink" data-pltdoc="x">1.17<span class="hspace"> </span>Lookup GUI: <span class="stt">"lkup-gui.rkt"</span><a name="(idx._(gentag._16._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="guess-gui.html" class="toclink" data-pltdoc="x">1.18<span class="hspace"> </span>Guess GUI: <span class="stt">"guess-gui.rkt"</span><a name="(idx._(gentag._17._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="show-queen.html" class="toclink" data-pltdoc="x">1.19<span class="hspace"> </span>Queens: <span class="stt">"show-queen.rkt"</span><a name="(idx._(gentag._18._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="matrix.html" class="toclink" data-pltdoc="x">1.20<span class="hspace"> </span>Matrix Functions: <span class="stt">"matrix.rkt"</span><a name="(idx._(gentag._19._(lib._teachpack/teachpack..scrbl)))"></a></a></p></td></tr></table><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" 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