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<title>Adds a negative arc</title>
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<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>
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