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49 lines
6.0 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>画一个多边形</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.imagepolygon" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagepolygon</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagepolygon</span> — <span class="dc-title">画一个多边形</span></p>
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</div>
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<div class="refsect1 unknown-unknown-seealsq" id="refsect1-function.imagepolygon-unknown-unknown-seealsq">
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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>imagepolygon</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
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, <span class="methodparam"><span class="type">array</span> <code class="parameter">$points</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$num_points</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$color</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>imagepolygon()</strong></span> 在图像中创建一个多边形。<code class="parameter">points</code>
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是一个 PHP 数组，包含了多边形的各个顶点坐标，即 points[0]
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= x0，points[1] = y0，points[2]
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= x1，points[3] = y1，以此类推。<code class="parameter">num_points</code>
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是顶点的总数。
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</p>
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<p class="para">
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<div class="example" id="example-3725">
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<p><strong>Example #1 <span class="function"><strong>imagepolygon()</strong></span> 例子</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">// create a blank image<br /></span><span style="color: #0000BB">$image </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">400</span><span style="color: #007700">, </span><span style="color: #0000BB">300</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// fill the background color<br /></span><span style="color: #0000BB">$bg </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// choose a color for the polygon<br /></span><span style="color: #0000BB">$col_poly </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// draw the polygon<br /></span><span style="color: #0000BB">imagepolygon</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">,<br /> array (<br /> </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">100</span><span style="color: #007700">, </span><span style="color: #0000BB">200</span><span style="color: #007700">,<br /> </span><span style="color: #0000BB">300</span><span style="color: #007700">, </span><span style="color: #0000BB">200<br /> </span><span style="color: #007700">),<br /> </span><span style="color: #0000BB">3</span><span style="color: #007700">,<br /> </span><span style="color: #0000BB">$col_poly</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// output the picture<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">"Content-type: image/png"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">);<br /><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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<p class="para">
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参见 <span class="function"><a href="imagecreate.html" class="function">imagecreate()</a></span> 和
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<span class="function"><a href="imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |