imageopenpolygon 函数

<h2>适用PHP版本</h2>
<p>PHP 5及以上版本。</p>

<h2>函数说明</h2>
<p>imageopenpolygon 函数用于在图像中绘制一个多边形。多边形是由指定的点阵数据所定义的，函数会使用指定的颜色将其渲染到图像上。</p>

<h2>函数语法</h2>
<p><strong>imageopenpolygon</strong>( resource $image, array $points, int $num_points, int $color )</p>

<h2>参数</h2>
<ul>
    <li><strong>$image</strong> (resource) - 图像资源，必须是通过imagecreatetruecolor()或imagecreate()函数创建的图像资源。</li>
    <li><strong>$points</strong> (array) - 包含多边形顶点坐标的数组。该数组应该包含一系列的数值，每两个连续的数值代表一个顶点的x和y坐标。</li>
    <li><strong>$num_points</strong> (int) - 多边形顶点的数量。</li>
    <li><strong>$color</strong> (int) - 用于绘制多边形的颜色。可以通过imagecolorallocate()函数获得该颜色。</li>
</ul>

<h2>返回值</h2>
<p>此函数没有返回值，成功时会直接修改图像资源。</p>

<h2>示例</h2>
<p>以下是一个示例代码，展示如何使用imageopenpolygon函数在图像上绘制一个三角形。</p>

<h2>示例代码</h2>
<pre>

<?php // 创建一个空白图像 $image = imagecreatetruecolor(200, 200); // 分配颜色 $background_color = imagecolorallocate($image, 255, 255, 255); $polygon_color = imagecolorallocate($image, 0, 0, 255); // 填充背景色 imagefill($image, 0, 0, $background_color); // 定义多边形的顶点坐标 $points = [ 50, 50, // 第一个顶点 (x1, y1) 150, 50, // 第二个顶点 (x2, y2) 100, 150 // 第三个顶点 (x3, y3) ]; // 绘制多边形 imageopenpolygon($image, $points, 3, $polygon_color); // 输出图像到浏览器 header('Content-Type: image/png'); imagepng($image); // 释放内存 imagedestroy($image); ?>

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5.53708 6.01057 5.14051 6.03809 4.80371C6.0755 4.34588 6.15483 3.94012 6.34668 3.56348L6.46875 3.34473C6.77282 2.84912 7.20856 2.44514 7.72949 2.17969L7.87207 2.11328C8.20855 1.96886 8.56979 1.90385 8.9707 1.87109C9.42091 1.83432 9.978 1.83496 10.667 1.83496H13.5C14.1891 1.83496 14.746 1.83431 15.1963 1.87109C15.6541 1.90851 16.0599 1.98788 16.4365 2.17969L16.6553 2.30176C17.151 2.60585 17.5548 3.04244 17.8203 3.56348L17.8867 3.70606C18.031 4.04235 18.0962 4.40306 18.1289 4.80371C18.1657 5.25395 18.165 5.81091 18.165 6.5V9.33301Z"></path></svg>复制</button><span class="" data-state="closed"><button class="flex items-center gap-1 py-1 select-none"><svg width="20" height="20" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M12.0303 4.11328C13.4406 2.70317 15.7275 2.70305 17.1377 4.11328C18.5474 5.52355 18.5476 7.81057 17.1377 9.2207L10.8457 15.5117C10.522 15.8354 10.2868 16.0723 10.0547 16.2627L9.82031 16.4395C9.61539 16.5794 9.39783 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示例代码的说明

在这个示例中，我们首先创建了一个200x200的图像并分配了一个背景色和一个多边形的颜色。接着，我们定义了三角形的三个顶点，并通过imageopenpolygon函数将其绘制到图像上。最后，我们将图像输出到浏览器并释放内存。