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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>10 Shadows</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="../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="../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">Pict:<span class="mywbr"> </span> Functional Pictures</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="Pict_Datatype.html" class="tocviewlink" data-pltdoc="x">Pict Datatype</a></td></tr><tr><td align="right">2 </td><td><a href="Basic_Pict_Constructors.html" class="tocviewlink" data-pltdoc="x">Basic Pict Constructors</a></td></tr><tr><td align="right">3 </td><td><a href="Pict_Combiners.html" class="tocviewlink" data-pltdoc="x">Pict Combiners</a></td></tr><tr><td align="right">4 </td><td><a href="Pict_Drawing_Adjusters.html" class="tocviewlink" data-pltdoc="x">Pict Drawing Adjusters</a></td></tr><tr><td align="right">5 </td><td><a href="Bounding_Box_Adjusters.html" class="tocviewlink" data-pltdoc="x">Bounding Box Adjusters</a></td></tr><tr><td align="right">6 </td><td><a href="Pict_Finders.html" class="tocviewlink" data-pltdoc="x">Pict Finders</a></td></tr><tr><td align="right">7 </td><td><a href="More_Pict_Constructors.html" class="tocviewlink" data-pltdoc="x">More Pict Constructors</a></td></tr><tr><td align="right">8 </td><td><a href="Animation_Helpers.html" class="tocviewlink" data-pltdoc="x">Animation Helpers</a></td></tr><tr><td align="right">9 </td><td><a href="Color_Helpers.html" class="tocviewlink" data-pltdoc="x">Color Helpers</a></td></tr><tr><td align="right">10 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Shadows</a></td></tr><tr><td align="right">11 </td><td><a href="Conditional_Combinations.html" class="tocviewlink" data-pltdoc="x">Conditional Combinations</a></td></tr><tr><td align="right">12 </td><td><a href="Tree_Layout.html" class="tocviewlink" data-pltdoc="x">Tree Layout</a></td></tr><tr><td align="right">13 </td><td><a href="Miscellaneous.html" class="tocviewlink" data-pltdoc="x">Miscellaneous</a></td></tr><tr><td align="right">14 </td><td><a href="Rendering.html" class="tocviewlink" data-pltdoc="x">Rendering</a></td></tr><tr><td align="right">15 </td><td><a href="Conversion_to_Picts.html" class="tocviewlink" data-pltdoc="x">Conversion to Picts</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._blur%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">blur</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._shadow%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">shadow</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._shadow-frame%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">shadow-<wbr></wbr>frame</span></span></a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="version">6.3</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, "6.3", "../");" 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("6.3");">top</a></span><span class="navright"> <a href="Color_Helpers.html" title="backward to "9 Color Helpers"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "Pict: Functional Pictures"" data-pltdoc="x">up</a> <a href="Conditional_Combinations.html" title="forward to "11 Conditional Combinations"" data-pltdoc="x">next →</a></span> </div><h3 x-source-module="(lib "pict/scribblings/pict.scrbl")" x-source-pkg="pict-doc" x-part-tag=""Shadows"">10<tt> </tt><a name="(part._.Shadows)"></a><a name="(mod-path._pict/shadow)"></a>Shadows</h3><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="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.3" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="stt"> </span><a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">pict/shadow</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <span class="stt">pict-lib</span></span></td></tr></table></p><p>These pict transformations add shadows or blurring in various shapes and
forms.</p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._pict/shadow..rkt)._blur))"></a><span title="Provided from: pict/shadow | Package: pict-lib"><span class="RktSym"><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._blur%29%29" class="RktValDef RktValLink" data-pltdoc="x">blur</a></span></span><span class="hspace"> </span><span class="RktVar">p</span><span class="hspace"> </span><span class="RktVar">h-radius</span><span class="hspace"> </span>[<span class="RktVar">v-radius</span>]<span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="Pict_Datatype.html#%28def._%28%28lib._pict%2Fmain..rkt%29._pict~3f%29%29" class="RktValLink" data-pltdoc="x">pict?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">p</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="Pict_Datatype.html#%28def._%28%28lib._pict%2Fmain..rkt%29._pict~3f%29%29" class="RktValLink" data-pltdoc="x">pict?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">h-radius</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._and%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">and/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._not%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">not/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._negative%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">negative?</a></span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">v-radius</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._and%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">and/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._not%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">not/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._negative%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">negative?</a></span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVar">h-radius</span></td></tr></table></blockquote></div><div class="SIntrapara">Blurs <span class="RktVar">p</span> using an iterated box blur that approximates a
gaussian blur. The <span class="RktVar">h-radius</span> and <span class="RktVar">v-radius</span> arguments
control the strength of the horizontal and vertical components of the
blur, respectively. They are given in terms of pict units, which may
not directly correspond to screen pixels.</div></p><p><div class="SIntrapara">The <span class="RktSym"><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._blur%29%29" class="RktValLink" data-pltdoc="x">blur</a></span> function takes work proportional to
</div><div class="SIntrapara"><blockquote class="SCodeFlow"><p><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=generic-numbers.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._%252A%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">*</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Pict_Datatype.html#%28def._%28%28lib._pict%2Fmain..rkt%29._pict-width%29%29" class="RktValLink" data-pltdoc="x">pict-width</a></span><span class="hspace"> </span><span class="RktVar">p</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Pict_Datatype.html#%28def._%28%28lib._pict%2Fmain..rkt%29._pict-height%29%29" class="RktValLink" data-pltdoc="x">pict-height</a></span><span class="hspace"> </span><span class="RktVar">p</span><span class="RktPn">)</span><span class="RktPn">)</span></p></blockquote></div><div class="SIntrapara">but it may be sped up by a factor of up to <span class="RktPn">(</span><span class="RktSym">processor-count</span><span class="RktPn">)</span>
due to the use of <span class="RktSym">future</span>s.</div></p><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._blur%29%29" class="RktValLink" data-pltdoc="x">blur</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Basic_Pict_Constructors.html#%28def._%28%28lib._pict%2Fmain..rkt%29._text%29%29" class="RktValLink" data-pltdoc="x">text</a></span><span class="hspace"> </span><span class="RktVal">"blur"</span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._null%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">null</a></span><span class="hspace"> </span><span class="RktVal">40</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">)</span></td></tr><tr><td><p><img style="vertical-align: 0px; margin: -3px -3px -3px -3px;" src="pict_122.png" alt="image" width="84.30078125" height="52.5625"/></p></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._blur%29%29" class="RktValLink" data-pltdoc="x">blur</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Basic_Pict_Constructors.html#%28def._%28%28lib._pict%2Fmain..rkt%29._text%29%29" class="RktValLink" data-pltdoc="x">text</a></span><span class="hspace"> </span><span class="RktVal">"more blur"</span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._null%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">null</a></span><span class="hspace"> </span><span class="RktVal">40</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">10</span><span class="RktPn">)</span></td></tr><tr><td><p><img style="vertical-align: 0px; margin: -3px -3px -3px -3px;" src="pict_123.png" alt="image" width="200.62890625" height="52.5625"/></p></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._blur%29%29" class="RktValLink" data-pltdoc="x">blur</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Basic_Pict_Constructors.html#%28def._%28%28lib._pict%2Fmain..rkt%29._text%29%29" class="RktValLink" data-pltdoc="x">text</a></span><span class="hspace"> </span><span class="RktVal">"much blur"</span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._null%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">null</a></span><span class="hspace"> </span><span class="RktVal">40</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">20</span><span class="RktPn">)</span></td></tr><tr><td><p><img style="vertical-align: 0px; margin: -3px -3px -3px -3px;" src="pict_124.png" alt="image" width="208.67578125" height="52.5625"/></p></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._blur%29%29" class="RktValLink" data-pltdoc="x">blur</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Basic_Pict_Constructors.html#%28def._%28%28lib._pict%2Fmain..rkt%29._text%29%29" class="RktValLink" data-pltdoc="x">text</a></span><span class="hspace"> </span><span class="RktVal">"horiz. blur"</span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._null%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">null</a></span><span class="hspace"> </span><span class="RktVal">40</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">10</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><p><img style="vertical-align: 0px; margin: -3px -3px -3px -3px;" src="pict_125.png" alt="image" width="208.109375" height="52.5625"/></p></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara">The resulting pict has the same bounding box as <span class="RktVar">p</span>, so when
picts are automatically <span class="RktSym"><a href="Pict_Drawing_Adjusters.html#%28def._%28%28lib._pict%2Fmain..rkt%29._clip%29%29" class="RktValLink" data-pltdoc="x">clip</a></span>ped (as in Scribble documents),
the pict should be <span class="RktSym"><a href="Bounding_Box_Adjusters.html#%28def._%28%28lib._pict%2Fmain..rkt%29._inset%29%29" class="RktValLink" data-pltdoc="x">inset</a></span> by the blur radius.
</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Example:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="Bounding_Box_Adjusters.html#%28def._%28%28lib._pict%2Fmain..rkt%29._inset%29%29" class="RktValLink" data-pltdoc="x">inset</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._blur%29%29" class="RktValLink" data-pltdoc="x">blur</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Basic_Pict_Constructors.html#%28def._%28%28lib._pict%2Fmain..rkt%29._text%29%29" class="RktValLink" data-pltdoc="x">text</a></span><span class="hspace"> </span><span class="RktVal">"more blur"</span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._null%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">null</a></span><span class="hspace"> </span><span class="RktVal">40</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">10</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">10</span><span class="RktPn">)</span></td></tr><tr><td><p><img style="vertical-align: -10px; margin: -3px -3px -3px -3px;" src="pict_126.png" alt="image" width="220.62890625" height="72.5625"/></p></td></tr></table></blockquote></td></tr></table></div></p><p class="SHistory">Added in version 1.4 of package <span class="stt">pict-lib</span>.</p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><table cellspacing="0" cellpadding="0" class="prototype RForeground"><tr><td valign="top"><span class="RktPn">(</span><a name="(def._((lib._pict/shadow..rkt)._shadow))"></a><span title="Provided from: pict/shadow | Package: pict-lib"><span class="RktSym"><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._shadow%29%29" class="RktValDef RktValLink" data-pltdoc="x">shadow</a></span></span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktVar">p</span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktVar">radius</span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span>[</td><td valign="top"><span class="RktVar">dx</span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktVar">dy</span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktPn">#:color</span><span class="hspace"> </span><span class="RktVar">color</span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktPn">#:shadow-color</span><span class="hspace"> </span><span class="RktVar">shadow-color</span>]<span class="RktPn">)</span></td><td valign="top"><span class="hspace"> </span></td><td valign="top">→</td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktSym"><a href="Pict_Datatype.html#%28def._%28%28lib._pict%2Fmain..rkt%29._pict~3f%29%29" class="RktValLink" data-pltdoc="x">pict?</a></span></td></tr></table></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">p</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="Pict_Datatype.html#%28def._%28%28lib._pict%2Fmain..rkt%29._pict~3f%29%29" class="RktValLink" data-pltdoc="x">pict?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">radius</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._and%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">and/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._not%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">not/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._negative%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">negative?</a></span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">dx</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">0</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">dy</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVar">dx</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">color</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">is-a?/c</span><span class="hspace"> </span><span class="RktSym">color%</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">#f</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">shadow-color</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">is-a?/c</span><span class="hspace"> </span><span class="RktSym">color%</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">#f</span></td></tr></table></blockquote></div><div class="SIntrapara">Creates a shadow effect by superimposing <span class="RktVar">p</span> over a
blurred version of <span class="RktVar">p</span>. The shadow is offset from <span class="RktVar">p</span> by
(<span class="RktVar">dx</span>, <span class="RktVar">dy</span>) units.</div></p><p>If <span class="RktVar">color</span> is not <span class="RktVal">#f</span>, the foreground part is
<span class="RktPn">(</span><span class="RktSym"><a href="Pict_Drawing_Adjusters.html#%28def._%28%28lib._pict%2Fmain..rkt%29._colorize%29%29" class="RktValLink" data-pltdoc="x">colorize</a></span><span class="stt"> </span><span class="RktVar">p</span><span class="stt"> </span><span class="RktVar">color</span><span class="RktPn">)</span>; otherwise it is just <span class="RktVar">p</span>. If
<span class="RktVar">shadow-color</span> is not <span class="RktVal">#f</span>, the shadow part is produced
by blurring <span class="RktPn">(</span><span class="RktSym"><a href="Pict_Drawing_Adjusters.html#%28def._%28%28lib._pict%2Fmain..rkt%29._colorize%29%29" class="RktValLink" data-pltdoc="x">colorize</a></span><span class="stt"> </span><span class="RktVar">p</span><span class="stt"> </span><span class="RktVar">shadow-color</span><span class="RktPn">)</span>; otherwise it is
produced by blurring <span class="RktVar">p</span>.</p><p>The resulting pict has the same bounding box as <span class="RktVar">p</span>.</p><p><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="Bounding_Box_Adjusters.html#%28def._%28%28lib._pict%2Fmain..rkt%29._inset%29%29" class="RktValLink" data-pltdoc="x">inset</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._shadow%29%29" class="RktValLink" data-pltdoc="x">shadow</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Basic_Pict_Constructors.html#%28def._%28%28lib._pict%2Fmain..rkt%29._text%29%29" class="RktValLink" data-pltdoc="x">text</a></span><span class="hspace"> </span><span class="RktVal">"shadow"</span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._null%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">null</a></span><span class="hspace"> </span><span class="RktVal">50</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">10</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">10</span><span class="RktPn">)</span></td></tr><tr><td><p><img style="vertical-align: -21.7919921875px; margin: -3px -3px -3px -3px;" src="pict_127.png" alt="image" width="217.6015625" height="84.203125"/></p></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="Bounding_Box_Adjusters.html#%28def._%28%28lib._pict%2Fmain..rkt%29._inset%29%29" class="RktValLink" data-pltdoc="x">inset</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._shadow%29%29" class="RktValLink" data-pltdoc="x">shadow</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Basic_Pict_Constructors.html#%28def._%28%28lib._pict%2Fmain..rkt%29._text%29%29" class="RktValLink" data-pltdoc="x">text</a></span><span class="hspace"> </span><span class="RktVal">"shadow"</span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._null%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">null</a></span><span class="hspace"> </span><span class="RktVal">50</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">10</span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">10</span><span class="RktPn">)</span></td></tr><tr><td><p><img style="vertical-align: -21.7919921875px; margin: -3px -3px -3px -3px;" src="pict_128.png" alt="image" width="217.6015625" height="84.203125"/></p></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="Bounding_Box_Adjusters.html#%28def._%28%28lib._pict%2Fmain..rkt%29._inset%29%29" class="RktValLink" data-pltdoc="x">inset</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._shadow%29%29" class="RktValLink" data-pltdoc="x">shadow</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Basic_Pict_Constructors.html#%28def._%28%28lib._pict%2Fmain..rkt%29._text%29%29" class="RktValLink" data-pltdoc="x">text</a></span><span class="hspace"> </span><span class="RktVal">"shadow"</span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._null%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">null</a></span><span class="hspace"> </span><span class="RktVal">50</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktVal">5</span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktPn">#:color</span><span class="hspace"> </span><span class="RktVal">"white"</span><span class="hspace"> </span><span class="RktPn">#:shadow-color</span><span class="hspace"> </span><span class="RktVal">"red"</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktVal">10</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td><p><img style="vertical-align: -21.7919921875px; margin: -3px -3px -3px -3px;" src="pict_129.png" alt="image" width="217.6015625" height="84.203125"/></p></td></tr></table></blockquote></td></tr></table></p><p class="SHistory">Added in version 1.4 of package <span class="stt">pict-lib</span>.</p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><table cellspacing="0" cellpadding="0" class="prototype RForeground"><tr><td valign="top"><span class="RktPn">(</span><a name="(def._((lib._pict/shadow..rkt)._shadow-frame))"></a><span title="Provided from: pict/shadow | Package: pict-lib"><span class="RktSym"><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._shadow-frame%29%29" class="RktValDef RktValLink" data-pltdoc="x">shadow-frame</a></span></span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktVar">pict</span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktMeta">...</span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span>[</td><td valign="top"><span class="RktPn">#:sep</span><span class="hspace"> </span><span class="RktVar">separation</span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktPn">#:margin</span><span class="hspace"> </span><span class="RktVar">margin</span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktPn">#:background-color</span><span class="hspace"> </span><span class="RktVar">bg-color</span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktPn">#:frame-color</span><span class="hspace"> </span><span class="RktVar">frame-color</span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktPn">#:frame-line-width</span><span class="hspace"> </span><span class="RktVar">frame-line-width</span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktPn">#:shadow-side-length</span><span class="hspace"> </span><span class="RktVar">shadow-side-length</span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktPn">#:shadow-top-y-offset</span><span class="hspace"> </span><span class="RktVar">shadow-top-y-offset</span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktPn">#:shadow-bottom-y-offset</span><span class="hspace"> </span><span class="RktVar">shadow-bottom-y-offset</span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktPn">#:shadow-descent</span><span class="hspace"> </span><span class="RktVar">shadow-descent</span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktPn">#:shadow-alpha-factor</span><span class="hspace"> </span><span class="RktVar">shadow-alpha-factor</span></td><td valign="top"><span class="hspace"> </span></td></tr><tr><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="hspace"> </span></td><td valign="top"><span class="RktPn">#:blur</span><span class="hspace"> </span><span class="RktVar">blur-radius</span>]<span class="RktPn">)</span></td><td valign="top"><span class="hspace"> </span></td></tr></table></blockquote></td></tr><tr><td><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="Pict_Datatype.html#%28def._%28%28lib._pict%2Fmain..rkt%29._pict~3f%29%29" class="RktValLink" data-pltdoc="x">pict?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">pict</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="Pict_Datatype.html#%28def._%28%28lib._pict%2Fmain..rkt%29._pict~3f%29%29" class="RktValLink" data-pltdoc="x">pict?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">separation</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">5</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">margin</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">20</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">bg-color</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">is-a?/c</span><span class="hspace"> </span><span class="RktSym">color%</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">"white"</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">frame-color</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">is-a?/c</span><span class="hspace"> </span><span class="RktSym">color%</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">"gray"</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">frame-line-width</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">0</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">shadow-side-length</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">4</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">shadow-top-y-offset</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">10</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">shadow-bottom-y-offset</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">4</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">shadow-descent</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._and%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">and/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._not%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">not/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._negative%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">negative?</a></span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">40</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">shadow-alpha-factor</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">3/4</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">blur-radius</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._and%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">and/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._real%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">real?</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._not%252Fc%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">not/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._negative%7E3f%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">negative?</a></span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">20</span></td></tr></table></blockquote></div><div class="SIntrapara">Surrounds the <span class="RktVar">pict</span>s with a rectangular frame that casts a
symmetric “curled paper” shadow.</div></p><p>The <span class="RktVar">pict</span>s are vertically appended with <span class="RktVar">separation</span>
space between them. They are placed on a rectangular background of
solid <span class="RktVar">bg-color</span> with <span class="RktVar">margin</span> space on all sides. A
frame of <span class="RktVar">frame-color</span> and <span class="RktVar">frame-line-width</span> is added
around the rectangle. The rectangle casts a shadow that extends
<span class="RktVar">shadow-side-length</span> to the left and right, starts
<span class="RktVar">shadow-top-y-offset</span> below the top of the rectangle and
extends to <span class="RktVar">shadow-bottom-y-offset</span> below the bottom of the
rectangle in the center and an additional <span class="RktVar">shadow-descent</span>
below that on the sides. The shadow is painted using a linear
gradient; <span class="RktVar">shadow-alpha-factor</span> determines its density at the
center. Finally, the shadow is blurred by <span class="RktVar">blur-radius</span>; all
previous measurements are pre-blur measurements.</p><p><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Example:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._pict%2Fshadow..rkt%29._shadow-frame%29%29" class="RktValLink" data-pltdoc="x">shadow-frame</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Basic_Pict_Constructors.html#%28def._%28%28lib._pict%2Fmain..rkt%29._text%29%29" class="RktValLink" data-pltdoc="x">text</a></span><span class="hspace"> </span><span class="RktVal">"text in a nifty frame"</span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.3/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._null%2529%2529&version=6.3" class="RktValLink Sq" data-pltdoc="x">null</a></span><span class="hspace"> </span><span class="RktVal">60</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><p><img style="vertical-align: -66.0px; margin: -3px -3px -3px -3px;" src="pict_130.png" alt="image" width="691.890625" height="201.84375"/></p></td></tr></table></blockquote></td></tr></table></p><p class="SHistory">Added in version 1.4 of package <span class="stt">pict-lib</span>.</p><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, "6.3", "../");" 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("6.3");">top</a></span><span class="navright"> <a href="Color_Helpers.html" title="backward to "9 Color Helpers"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "Pict: Functional Pictures"" data-pltdoc="x">up</a> <a href="Conditional_Combinations.html" title="forward to "11 Conditional Combinations"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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