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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>Graphics: Legacy Library</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.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="" class="tocviewselflink" data-pltdoc="x">Graphics:<span class="mywbr"> </span> Legacy Library</a></td></tr></table></div><div class="tocviewsublistonly" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="Basic_Commands.html" class="tocviewlink" data-pltdoc="x">Basic Commands</a></td></tr><tr><td align="right">2 </td><td><a href="posn.html" class="tocviewlink" data-pltdoc="x">Position Operations</a></td></tr><tr><td align="right">3 </td><td><a href="Color_Operations.html" class="tocviewlink" data-pltdoc="x">Color Operations</a></td></tr><tr><td align="right">4 </td><td><a href="Draw__Clear__and_Flip_Operations.html" class="tocviewlink" data-pltdoc="x">Draw, Clear, and Flip Operations</a></td></tr><tr><td align="right">5 </td><td><a href="World_Operations.html" class="tocviewlink" data-pltdoc="x">World Operations</a></td></tr><tr><td align="right">6 </td><td><a href="Miscellaneous_Operations.html" class="tocviewlink" data-pltdoc="x">Miscellaneous Operations</a></td></tr><tr><td align="right">7 </td><td><a href="An_Example.html" class="tocviewlink" data-pltdoc="x">An Example</a></td></tr><tr><td align="right">8 </td><td><a href="A_More_Complicated_Example.html" class="tocviewlink" data-pltdoc="x">A More Complicated Example</a></td></tr><tr><td align="right">9 </td><td><a href="Protecting_Graphics_Operations.html" class="tocviewlink" data-pltdoc="x">Protecting Graphics Operations</a></td></tr><tr><td align="right">10 </td><td><a href="Mouse_Operations.html" class="tocviewlink" data-pltdoc="x">Mouse Operations</a></td></tr><tr><td align="right">11 </td><td><a href="Keyboard_Operations.html" class="tocviewlink" data-pltdoc="x">Keyboard Operations</a></td></tr><tr><td align="right">12 </td><td><a href="Flushing.html" class="tocviewlink" data-pltdoc="x">Flushing</a></td></tr><tr><td align="right">13 </td><td><a href="Graphics_Library_as_a_Unit.html" class="tocviewlink" data-pltdoc="x">Graphics Library as a Unit</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><span class="tocsublinknumber"></span><a href="#%28part._top%29" class="tocsubseclink" data-pltdoc="x">Graphics:<span class="mywbr"> </span> Legacy Library</a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="version">6.7</span></div><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, "6.7", "../");" 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("6.7");">top</a></span><span class="navright"> <span class="nonavigation">← prev</span> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.7");">up</a> <a href="Basic_Commands.html" title="forward to "1 Basic Commands"" data-pltdoc="x">next →</a></span> </div><h2 x-source-module="(lib "graphics/scribblings/graphics.scrbl")" x-source-pkg="htdp-doc" x-part-tag=""top""><a name="(part._top)"></a><a name="(part._.Graphics__.Legacy_.Library)"></a><a name="(mod-path._graphics/graphics)"></a>Graphics: Legacy Library</h2><p><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left"><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="stt"> </span><a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">graphics/graphics</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <span class="stt">htdp-lib</span></span></td></tr></table></p><p>The viewport graphics library is a relatively simple toolbox of
graphics commands. The library is not very powerful; it is intended as
a simplified alternative to <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=gui&rel=index.html&version=6.7" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/gui</span></a>’s full
graphical toolbox.</p><p>The graphics library originated as SIXlib, a library of X Windows
commands available within Chez Scheme at Rice University. The
functionality of that library has been reproduced (with backward
compatibility) in this version.</p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace"> </span><a href="Basic_Commands.html" class="toptoclink" data-pltdoc="x">1<span class="hspace"> </span>Basic Commands</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="posn.html" class="toptoclink" data-pltdoc="x">2<span class="hspace"> </span>Position Operations</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Color_Operations.html" class="toptoclink" data-pltdoc="x">3<span class="hspace"> </span>Color Operations</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Draw__Clear__and_Flip_Operations.html" class="toptoclink" data-pltdoc="x">4<span class="hspace"> </span>Draw, Clear, and Flip Operations</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Draw__Clear__and_Flip_Operations.html#%28part._.Viewports%29" class="toclink" data-pltdoc="x">4.1<span class="hspace"> </span>Viewports</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Draw__Clear__and_Flip_Operations.html#%28part._.Pixels%29" class="toclink" data-pltdoc="x">4.2<span class="hspace"> </span>Pixels</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Draw__Clear__and_Flip_Operations.html#%28part._.Lines%29" class="toclink" data-pltdoc="x">4.3<span class="hspace"> </span>Lines</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Draw__Clear__and_Flip_Operations.html#%28part._.Rectangles%29" class="toclink" data-pltdoc="x">4.4<span class="hspace"> </span>Rectangles</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Draw__Clear__and_Flip_Operations.html#%28part._.Ellipses%29" class="toclink" data-pltdoc="x">4.5<span class="hspace"> </span>Ellipses</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Draw__Clear__and_Flip_Operations.html#%28part._.Polygons%29" class="toclink" data-pltdoc="x">4.6<span class="hspace"> </span>Polygons</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Draw__Clear__and_Flip_Operations.html#%28part._.Strings%29" class="toclink" data-pltdoc="x">4.7<span class="hspace"> </span>Strings</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Draw__Clear__and_Flip_Operations.html#%28part._.Pixmaps%29" class="toclink" data-pltdoc="x">4.8<span class="hspace"> </span>Pixmaps</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="World_Operations.html" class="toptoclink" data-pltdoc="x">5<span class="hspace"> </span>World Operations</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Miscellaneous_Operations.html" class="toptoclink" data-pltdoc="x">6<span class="hspace"> </span>Miscellaneous Operations</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="An_Example.html" class="toptoclink" data-pltdoc="x">7<span class="hspace"> </span>An Example</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="A_More_Complicated_Example.html" class="toptoclink" data-pltdoc="x">8<span class="hspace"> </span>A More Complicated Example</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Protecting_Graphics_Operations.html" class="toptoclink" data-pltdoc="x">9<span class="hspace"> </span>Protecting Graphics Operations</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Mouse_Operations.html" class="toptoclink" data-pltdoc="x">10<span class="hspace"> </span>Mouse Operations</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Keyboard_Operations.html" class="toptoclink" data-pltdoc="x">11<span class="hspace"> </span>Keyboard Operations</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Flushing.html" class="toptoclink" data-pltdoc="x">12<span class="hspace"> </span>Flushing</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Graphics_Library_as_a_Unit.html" class="toptoclink" data-pltdoc="x">13<span class="hspace"> </span>Graphics Library as a Unit</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Graphics_Library_as_a_Unit.html#%28part._.Signatures%29" class="toclink" data-pltdoc="x">13.1<span class="hspace"> </span>Signatures</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Graphics_Library_as_a_Unit.html#%28part._.Unit_with_posn%29" class="toclink" data-pltdoc="x">13.2<span class="hspace"> </span>Unit with <span class="RktSym"><span class="RktValLink">posn</span></span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Graphics_Library_as_a_Unit.html#%28part._.Unit_without_posn%29" class="toclink" data-pltdoc="x">13.3<span class="hspace"> </span>Unit without <span class="RktSym"><span class="RktValLink">posn</span></span></a></p></td></tr></table><div class="navsetbottom"><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, "6.7", "../");" 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 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