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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>The Racket Drawing Toolkit</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">The Racket Drawing Toolkit</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="overview.html" class="tocviewlink" data-pltdoc="x">Overview</a></td></tr><tr><td align="right">2 </td><td><a href="bitmap_.html" class="tocviewlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">bitmap%</span></span></a></td></tr><tr><td align="right">3 </td><td><a href="bitmap-dc_.html" class="tocviewlink" data-pltdoc="x"><span class="RktSym"><span 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class="RktSym"><span class="RktValLink">region%</span></span></a></td></tr><tr><td align="right">25 </td><td><a href="svg-dc_.html" class="tocviewlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">svg-<wbr></wbr>dc%</span></span></a></td></tr><tr><td align="right">26 </td><td><a href="Drawing_Functions.html" class="tocviewlink" data-pltdoc="x">Drawing Functions</a></td></tr><tr><td align="right">27 </td><td><a href="Drawing_Contracts.html" class="tocviewlink" data-pltdoc="x">Drawing Contracts</a></td></tr><tr><td align="right">28 </td><td><a href="Signature_and_Unit.html" class="tocviewlink" data-pltdoc="x">Signature and Unit</a></td></tr><tr><td align="right">29 </td><td><a href="unsafe.html" class="tocviewlink" data-pltdoc="x">Unsafe Libraries</a></td></tr><tr><td align="right">30 </td><td><a href="libs.html" class="tocviewlink" data-pltdoc="x">Platform Dependencies</a></td></tr><tr><td align="right"></td><td><a href="doc-bibliography.html" class="tocviewlink" data-pltdoc="x">Bibliography</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</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">The Racket Drawing Toolkit</a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="version">6.1</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, "6.1", "../");" 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"> <span class="nonavigation">← prev</span> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">up</a> <a href="overview.html" title="forward to "1 Overview"" data-pltdoc="x">next →</a></span> </div><h2 x-source-module="(lib "scribblings/draw/draw.scrbl")" x-part-tag=""top""><a name="(part._top)"></a><a name="(part._.The_.Racket_.Drawing_.Toolkit)"></a><a name="(mod-path._racket/draw)"></a>The Racket Drawing Toolkit</h2><div class="SAuthorListBox"><span class="SAuthorList"><p class="author">Matthew Flatt,<br/>Robert Bruce Findler,<br/>and John Clements</p></span></div><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left"><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="stt"> </span><a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/draw</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <span class="stt">draw-lib</span></span></td></tr></table></div><div class="SIntrapara">The
<a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">racket/draw</span></a> library provides all of the class,
interface, and procedure bindings defined in this manual.</div></p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace"> </span><a href="overview.html" class="toptoclink" data-pltdoc="x">1<span class="hspace"> </span>Overview</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="overview.html#%28part._.Lines_and_.Simple_.Shapes%29" class="toclink" data-pltdoc="x">1.1<span class="hspace"> </span>Lines and Simple Shapes</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="overview.html#%28part._.Pen__.Brush__and_.Color_.Objects%29" class="toclink" data-pltdoc="x">1.2<span class="hspace"> </span>Pen, Brush, and Color Objects</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="overview.html#%28part._.Transformations%29" class="toclink" data-pltdoc="x">1.3<span class="hspace"> </span>Transformations</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="overview.html#%28part._.Drawing_.Paths%29" class="toclink" data-pltdoc="x">1.4<span class="hspace"> </span>Drawing Paths</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="overview.html#%28part._.Text%29" class="toclink" data-pltdoc="x">1.5<span class="hspace"> </span>Text</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="overview.html#%28part._.Alpha_.Channels_and_.Alpha_.Blending%29" class="toclink" data-pltdoc="x">1.6<span class="hspace"> </span>Alpha Channels and Alpha Blending</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="overview.html#%28part._.Clipping%29" class="toclink" data-pltdoc="x">1.7<span class="hspace"> </span>Clipping</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="overview.html#%28part._.Portability%29" class="toclink" data-pltdoc="x">1.8<span class="hspace"> </span>Portability and Bitmap Variants</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="bitmap_.html" class="toptoclink" data-pltdoc="x">2<span class="hspace"> </span><span class="RktSym"><span class="RktValLink">bitmap%</span></span></a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="bitmap-dc_.html" class="toptoclink" data-pltdoc="x">3<span class="hspace"> </span><span class="RktSym"><span class="RktValLink">bitmap-dc%</span></span></a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="brush_.html" class="toptoclink" data-pltdoc="x">4<span class="hspace"> </span><span class="RktSym"><span class="RktValLink">brush%</span></span></a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="brush-list_.html" class="toptoclink" data-pltdoc="x">5<span class="hspace"> </span><span class="RktSym"><span class="RktValLink">brush-list%</span></span></a></p></td></tr><tr><td><p><span 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</span><a href="gl-config_.html" class="toptoclink" data-pltdoc="x">13<span class="hspace"> </span><span class="RktSym"><span class="RktValLink">gl-config%</span></span></a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="gl-context___.html" class="toptoclink" data-pltdoc="x">14<span class="hspace"> </span><span class="RktSym"><span class="RktValLink">gl-context<%></span></span></a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="linear-gradient_.html" class="toptoclink" data-pltdoc="x">15<span class="hspace"> </span><span class="RktSym"><span class="RktValLink">linear-gradient%</span></span></a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="pdf-dc_.html" class="toptoclink" data-pltdoc="x">16<span class="hspace"> </span><span class="RktSym"><span 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class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="region_.html" class="toptoclink" data-pltdoc="x">24<span class="hspace"> </span><span class="RktSym"><span class="RktValLink">region%</span></span></a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="svg-dc_.html" class="toptoclink" data-pltdoc="x">25<span class="hspace"> </span><span class="RktSym"><span class="RktValLink">svg-dc%</span></span></a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Drawing_Functions.html" class="toptoclink" data-pltdoc="x">26<span class="hspace"> </span>Drawing Functions</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Drawing_Contracts.html" class="toptoclink" data-pltdoc="x">27<span class="hspace"> </span>Drawing Contracts</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Signature_and_Unit.html" class="toptoclink" data-pltdoc="x">28<span class="hspace"> </span>Signature and Unit</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Signature_and_Unit.html#%28part._.Draw_.Unit%29" class="toclink" data-pltdoc="x">28.1<span class="hspace"> </span>Draw Unit</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Signature_and_Unit.html#%28part._.Draw_.Signature%29" class="toclink" data-pltdoc="x">28.2<span class="hspace"> </span>Draw Signature</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="unsafe.html" class="toptoclink" data-pltdoc="x">29<span class="hspace"> </span>Unsafe Libraries</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="unsafe.html#%28part._.Handle_.Brushes%29" class="toclink" data-pltdoc="x">29.1<span class="hspace"> </span>Handle Brushes</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="unsafe.html#%28part._.Cairo_.Library%29" class="toclink" data-pltdoc="x">29.2<span class="hspace"> </span>Cairo Library</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="libs.html" class="toptoclink" data-pltdoc="x">30<span class="hspace"> </span>Platform Dependencies</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="doc-bibliography.html" class="toptoclink" data-pltdoc="x">Bibliography</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="doc-index.html" class="toptoclink" data-pltdoc="x">Index</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 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