<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Adds a negative arc</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="cairocontext.arc.html">CairoContext::arc</a></div> <div class="next" style="text-align: right; float: right;"><a href="cairocontext.clip.html">CairoContext::clip</a></div> <div class="up"><a href="class.cairocontext.html">CairoContext</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="cairocontext.arcnegative" class="refentry"> <div class="refnamediv"> <h1 class="refname">CairoContext::arcNegative</h1> <h1 class="refname">cairo_arc_negative</h1> <p class="verinfo">(PECL cairo >= 0.1.0)</p><p class="refpurpose"><span class="refname">CairoContext::arcNegative</span> -- <span class="refname">cairo_arc_negative</span> — <span class="dc-title">Adds a negative arc</span></p> </div> <div class="refsect1 description" id="refsect1-cairocontext.arcnegative-description"> <h3 class="title">Description</h3> <p class="para">Object oriented style (method):</p> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type"><span class="type void">void</span></span> <span class="methodname"><strong>CairoContext::arcNegative</strong></span> ( <span class="methodparam"><span class="type">float</span> <code class="parameter">$x</code></span> , <span class="methodparam"><span class="type">float</span> <code class="parameter">$y</code></span> , <span class="methodparam"><span class="type">float</span> <code class="parameter">$radius</code></span> , <span class="methodparam"><span class="type">float</span> <code class="parameter">$angle1</code></span> , <span class="methodparam"><span class="type">float</span> <code class="parameter">$angle2</code></span> )</div> <p class="para rdfs-comment">Procedural style:</p> <div class="methodsynopsis dc-description"> <span class="type"><span class="type void">void</span></span> <span class="methodname"><strong>cairo_arc_negative</strong></span> ( <span class="methodparam"><span class="type"><a href="class.cairocontext.html" class="type CairoContext">CairoContext</a></span> <code class="parameter">$context</code></span> , <span class="methodparam"><span class="type">float</span> <code class="parameter">$x</code></span> , <span class="methodparam"><span class="type">float</span> <code class="parameter">$y</code></span> , <span class="methodparam"><span class="type">float</span> <code class="parameter">$radius</code></span> , <span class="methodparam"><span class="type">float</span> <code class="parameter">$angle1</code></span> , <span class="methodparam"><span class="type">float</span> <code class="parameter">$angle2</code></span> )</div> <p class="para rdfs-comment"> Adds a circular arc of the given <em><code class="parameter">radius</code></em> to the current path. The arc is centered at (<em><code class="parameter">x</code></em>, <em><code class="parameter">y</code></em>), begins at <em><code class="parameter">angle1</code></em> and proceeds in the direction of decreasing angles to end at <em><code class="parameter">angle2</code></em>. If <em><code class="parameter">angle2</code></em> is greater than <em><code class="parameter">angle1</code></em> it will be progressively decreased by 2*M_PI until it is less than <em><code class="parameter">angle1</code></em>. See <span class="methodname"><a href="cairocontext.arc.html" class="methodname">CairoContext::arc()</a></span> or <span class="function"><a href="cairocontext.arc.html" class="function">cairo_arc()</a></span> for more details. This function differs only in the direction of the arc between the two angles. </p> </div> <div class="refsect1 parameters" id="refsect1-cairocontext.arcnegative-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><em><code class="parameter">context</code></em></span> <dd> <p class="para"> A valid CairoContext object </p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">x</code></em></span> <dd> <p class="para"> double x position </p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">y</code></em></span> <dd> <p class="para"> double y position </p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">radius</code></em></span> <dd> <p class="para"> The radius of the desired negative arc </p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">angle1</code></em></span> <dd> <p class="para"> Start angle of the arc </p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">angle2</code></em></span> <dd> <p class="para"> End angle of the arc </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-cairocontext.arcnegative-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> No value is returned. </p> </div> <div class="refsect1 examples" id="refsect1-cairocontext.arcnegative-examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="example-2850"> <p><strong>Example #1 Object oriented style</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /><br />$s </span><span style="color: #007700">= new </span><span style="color: #0000BB">CairoImageSurface</span><span style="color: #007700">(</span><span style="color: #0000BB">CairoFormat</span><span style="color: #007700">::</span><span style="color: #0000BB">ARGB32</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$c </span><span style="color: #007700">= new </span><span style="color: #0000BB">CairoContext</span><span style="color: #007700">(</span><span style="color: #0000BB">$s</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$c</span><span style="color: #007700">-></span><span style="color: #0000BB">setSourceRgb</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$c</span><span style="color: #007700">-></span><span style="color: #0000BB">paint</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">$c</span><span style="color: #007700">-></span><span style="color: #0000BB">setLineWidth</span><span style="color: #007700">(</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$c</span><span style="color: #007700">-></span><span style="color: #0000BB">setSourceRgb</span><span style="color: #007700">(</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /><br />for (</span><span style="color: #0000BB">$r </span><span style="color: #007700">= </span><span style="color: #0000BB">50</span><span style="color: #007700">; </span><span style="color: #0000BB">$r </span><span style="color: #007700">> </span><span style="color: #0000BB">0</span><span style="color: #007700">; </span><span style="color: #0000BB">$r </span><span style="color: #007700">-= </span><span style="color: #0000BB">10</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$c</span><span style="color: #007700">-></span><span style="color: #0000BB">arcNegative</span><span style="color: #007700">(</span><span style="color: #0000BB">50</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">, </span><span style="color: #0000BB">$r</span><span style="color: #007700">, </span><span style="color: #0000BB">2 </span><span style="color: #007700">* </span><span style="color: #0000BB">M_PI</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$c</span><span style="color: #007700">-></span><span style="color: #0000BB">stroke</span><span style="color: #007700">();<br /> </span><span style="color: #0000BB">$c</span><span style="color: #007700">-></span><span style="color: #0000BB">fill</span><span style="color: #007700">();<br />}<br /><br /></span><span style="color: #0000BB">$s</span><span style="color: #007700">-></span><span style="color: #0000BB">writeToPng</span><span style="color: #007700">(</span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #0000BB">__FILE__</span><span style="color: #007700">) . </span><span style="color: #DD0000">'/CairoContext__arcNegative.png'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> </div> </p> <p class="para"> <div class="example" id="example-2851"> <p><strong>Example #2 Procedural style</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /><br />$s </span><span style="color: #007700">= </span><span style="color: #0000BB">cairo_image_surface_create</span><span style="color: #007700">(</span><span style="color: #0000BB">CAIRO_SURFACE_TYPE_IMAGE</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$c </span><span style="color: #007700">= </span><span style="color: #0000BB">cairo_create</span><span style="color: #007700">(</span><span style="color: #0000BB">$s</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">cairo_set_source_rgb</span><span style="color: #007700">(</span><span style="color: #0000BB">$c</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">cairo_paint</span><span style="color: #007700">(</span><span style="color: #0000BB">$c</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">cairo_set_source_rgb</span><span style="color: #007700">(</span><span style="color: #0000BB">$c</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">cairo_set_line_width</span><span style="color: #007700">(</span><span style="color: #0000BB">$c</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /><br />for (</span><span style="color: #0000BB">$r </span><span style="color: #007700">= </span><span style="color: #0000BB">50</span><span style="color: #007700">; </span><span style="color: #0000BB">$r </span><span style="color: #007700">> </span><span style="color: #0000BB">0</span><span style="color: #007700">; </span><span style="color: #0000BB">$r </span><span style="color: #007700">-= </span><span style="color: #0000BB">10</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">cairo_arc_negative</span><span style="color: #007700">(</span><span style="color: #0000BB">$c</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">, </span><span style="color: #0000BB">$r</span><span style="color: #007700">, </span><span style="color: #0000BB">2 </span><span style="color: #007700">* </span><span style="color: #0000BB">M_PI</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">cairo_stroke</span><span style="color: #007700">(</span><span style="color: #0000BB">$c</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">cairo_fill</span><span style="color: #007700">(</span><span style="color: #0000BB">$c</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">cairo_surface_write_to_png</span><span style="color: #007700">(</span><span style="color: #0000BB">$s</span><span style="color: #007700">, </span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #0000BB">__FILE__</span><span style="color: #007700">) . </span><span style="color: #DD0000">'/cairo_arc_negative.png'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> </div> </p> </div> <div class="refsect1 seealso" id="refsect1-cairocontext.arcnegative-seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"> <span class="methodname"><a href="cairocontext.arc.html" class="methodname" rel="rdfs-seeAlso">CairoContext::arc()</a> - Adds a circular arc</span></li> </ul> </p> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; 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