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52 lines
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HTML
52 lines
5.9 KiB
HTML
<!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>画椭圆弧</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.imagearc" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagearc</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagearc</span> — <span class="dc-title">画椭圆弧</span></p>
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</div>
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<div class="refsect1 unknown-seealsp" id="refsect1-function.imagearc-unknown-seealsp">
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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>imagearc</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$cx</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$cy</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$w</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$h</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$s</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$e</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$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>imagearc()</strong></span> 以
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<code class="parameter">cx</code>，<code class="parameter">cy</code>（图像左上角为 0, 0）为中心在
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<code class="parameter">image</code> 所代表的图像中画一个椭圆弧。<code class="parameter">w</code>
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和 <code class="parameter">h</code> 分别指定了椭圆的宽度和高度，起始和结束点以
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<code class="parameter">s</code> 和 <code class="parameter">e</code>
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参数以角度指定。0°位于三点钟位置，以顺时针方向绘画。
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</p>
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<div class="example" id="example-3657">
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<p><strong>Example #1 用 <span class="function"><strong>imagearc()</strong></span> 画一个圆</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">// 创建一个 200X200 的图像<br /></span><span style="color: #0000BB">$img </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">200</span><span style="color: #007700">, </span><span style="color: #0000BB">200</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// 分配颜色<br /></span><span style="color: #0000BB">$white </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$img</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$black </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$img</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// 画一个黑色的圆<br /></span><span style="color: #0000BB">imagearc</span><span style="color: #007700">(</span><span style="color: #0000BB">$img</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">, </span><span style="color: #0000BB">150</span><span style="color: #007700">, </span><span style="color: #0000BB">150</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">360</span><span style="color: #007700">, </span><span style="color: #0000BB">$black</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// 将图像输出到浏览器<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">"Content-type: image/png"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$img</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// 释放内存<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$img</span><span style="color: #007700">);<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 class="para">
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参见 <span class="function"><a href="imageellipse.html" class="function">imageellipse()</a></span>，<span class="function"><a href="imagefilledellipse.html" class="function">imagefilledellipse()</a></span>
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和 <span class="function"><a href="imagefilledarc.html" class="function">imagefilledarc()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |