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211 lines
8.3 KiB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Set the interpolation method</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.imagesetinterpolation" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagesetinterpolation</h1>
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<p class="verinfo">(PHP 5 >= 5.5.0, PHP 7)</p><p class="refpurpose"><span class="refname">imagesetinterpolation</span> — <span class="dc-title">Set the interpolation method</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imagesetinterpolation-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>imagesetinterpolation</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$method</code><span class="initializer"> = IMG_BILINEAR_FIXED</span></span>
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] ) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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Sets the interpolation method, setting an interpolation method affects the rendering
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of various functions in GD, such as the <span class="function"><a href="imagerotate.html" class="function">imagerotate()</a></span> function.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.imagesetinterpolation-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">image</code></dt>
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<dd>
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<p class="para">由图象创建函数(例如<span class="function"><a href="imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>)返回的图象资源。</p></dd>
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<dt>
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<code class="parameter">method</code></dt>
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<dd>
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<p class="para">
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The interpolation method, which can be one of the following:
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<ul class="itemizedlist">
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_BELL</code></strong>: Bell filter.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_BESSEL</code></strong>: Bessel filter.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_BICUBIC</code></strong>: Bicubic interpolation.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_BICUBIC_FIXED</code></strong>: Fixed point implementation of the bicubic interpolation.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_BILINEAR_FIXED</code></strong>: Fixed point implementation of the bilinear interpolation (<em>default (also on image creation)</em>).
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_BLACKMAN</code></strong>: Blackman window function.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_BOX</code></strong>: Box blur filter.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_BSPLINE</code></strong>: Spline interpolation.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_CATMULLROM</code></strong>: Cubic Hermite spline interpolation.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_GAUSSIAN</code></strong>: Gaussian function.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_GENERALIZED_CUBIC</code></strong>: Generalized cubic spline fractal interpolation.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_HERMITE</code></strong>: Hermite interpolation.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_HAMMING</code></strong>: Hamming filter.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_HANNING</code></strong>: Hanning filter.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_MITCHELL</code></strong>: Mitchell filter.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_POWER</code></strong>: Power interpolation.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_QUADRATIC</code></strong>: Inverse quadratic interpolation.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_SINC</code></strong>: Sinc function.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_NEAREST_NEIGHBOUR</code></strong>: Nearest neighbour interpolation.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_WEIGHTED4</code></strong>: Weighting filter.
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<strong><code>IMG_TRIANGLE</code></strong>: Triangle interpolation.
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</span>
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</li>
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</ul>
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.imagesetinterpolation-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.imagesetinterpolation-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-3736">
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<p><strong>Example #1 <span class="function"><strong>imagesetinterpolation()</strong></span> example</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Load an image<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreate</span><span style="color: #007700">(</span><span style="color: #0000BB">500</span><span style="color: #007700">, </span><span style="color: #0000BB">500</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// By default interpolation is IMG_BILINEAR_FIXED, switch <br />// to use the 'Mitchell' filter:<br /></span><span style="color: #0000BB">imagesetinterpolation</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">IMG_MITCHELL</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Continue to work with $im ...<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.imagesetinterpolation-notes">
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<h3 class="title">注释</h3>
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<p class="para">
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Changing the interpolation method affects the following functions
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when rendering:
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<ul class="itemizedlist">
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<li class="listitem">
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<span class="simpara">
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<span class="function"><a href="imageaffine.html" class="function">imageaffine()</a></span>
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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<span class="function"><a href="imagerotate.html" class="function">imagerotate()</a></span>
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</span>
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</li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |