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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>用 PostScript Type1 字体把文本字符串画在图像上</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.imagepstext" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagepstext</h1>
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<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">imagepstext</span> — <span class="dc-title">用 PostScript Type1 字体把文本字符串画在图像上</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imagepstext-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>imagepstext</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$text</code></span>
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, <span class="methodparam"><span class="type">resource</span> <code class="parameter">$font_index</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$size</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$foreground</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$background</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$x</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$y</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$space</code><span class="initializer"> = 0</span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$tightness</code><span class="initializer"> = 0</span></span>
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[, <span class="methodparam"><span class="type">float</span> <code class="parameter">$angle</code><span class="initializer"> = 0.0</span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$antialias_steps</code><span class="initializer"> = 4</span></span>
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]]]] ) : <span class="type">array</span></div>
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<p class="para rdfs-comment">
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用 PostScript Type1 字体把文本字符串画在图像上。
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</p>
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<p class="para">
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如果不很理解请参考 PostScript
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文档中关于字体及其度量系统的部分。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.imagepstext-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">text</code></dt>
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<dd>
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<p class="para">
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要写入的文本。
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</p>
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</dd>
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<dt>
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<code class="parameter">font_index</code></dt>
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<dd>
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<p class="para"> <span class="function"><a href="imagepsloadfont.html" class="function">imagepsloadfont()</a></span> 返回的字体资源。
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</p>
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</dd>
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<dt>
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<code class="parameter">size</code></dt>
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<dd>
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<p class="para">
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<code class="parameter">size</code> 以像素来表达。
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</p>
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</dd>
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<dt>
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<code class="parameter">foreground</code></dt>
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<dd>
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<p class="para">
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写入的字体的颜色。
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</p>
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</dd>
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<dt>
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<code class="parameter">background</code></dt>
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<dd>
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<p class="para">
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文本以防锯齿（antialiasing）方式尝试淡入的颜色。以 <code class="parameter">background</code>
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为颜色的像素实际上不会被画上去，所以背景图像不需要是实心的颜色。
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</p>
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</dd>
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<dt>
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<code class="parameter">x</code></dt>
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<dd>
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<p class="para">
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第一个字符的左下角起点 x 坐标。
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</p>
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</dd>
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<dt>
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<code class="parameter">y</code></dt>
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<dd>
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<p class="para">
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第一个字符的左下角 y 坐标 。
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</p>
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</dd>
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<dt>
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<code class="parameter">space</code></dt>
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<dd>
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<p class="para">
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<code class="parameter">space</code> 可以用来改变字体中默认间距的值。此值将被加到通常的值上，可以为负值。
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以字符间距单元表示，1 个单元为 1 em-square 的一千分之一。
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</p>
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</dd>
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<dt>
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<code class="parameter">tightness</code></dt>
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<dd>
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<p class="para"> <code class="parameter">tightness</code> 可以控制字符之间的间距。此值将被加到通常字符宽度上Z，可以为负值。
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以字符间距单元表示，1 个单元为 1 em-square 的一千分之一。
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</p>
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</dd>
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<dt>
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<code class="parameter">angle</code></dt>
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<dd>
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<p class="para">
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<code class="parameter">angle</code> 以角度表示。
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</p>
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</dd>
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<dt>
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<code class="parameter">antialias_steps</code></dt>
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<dd>
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<p class="para">
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可以控制防混色文本使用的颜色的数目。允许值为
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4 和 16。大的数值推荐用于大小小于 20
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的文本，对文本质量的效果相当明显。对更大的大小，用 4，计算强度小一些。
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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.imagepstext-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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本函数返回一个包含下列单元的数组：
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<table class="doctable informaltable">
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<tbody class="tbody">
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<tr>
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<td>0</td>
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<td>左下角的 X 坐标</td>
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</tr>
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<tr>
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<td>1</td>
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<td>左下角的 Y 坐标</td>
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</tr>
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<tr>
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<td>2</td>
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<td>右上角的 X 坐标</td>
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</tr>
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<tr>
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<td>3</td>
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<td>右上角的 Y 坐标</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.imagepstext-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-3732">
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<p><strong>Example #1 <span class="function"><strong>imagepstext()</strong></span> 用法</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">// 创建图像句柄<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">200</span><span style="color: #007700">, </span><span style="color: #0000BB">200</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 分配颜色<br /></span><span style="color: #0000BB">$black </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$white </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 载入 PostScript 字体<br /></span><span style="color: #0000BB">$font </span><span style="color: #007700">= </span><span style="color: #0000BB">imagepsloadfont</span><span style="color: #007700">(</span><span style="color: #DD0000">'font.pfm'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 将字体写入图像<br /></span><span style="color: #0000BB">imagepstext</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #DD0000">'Sample text is simple'</span><span style="color: #007700">, </span><span style="color: #0000BB">$font</span><span style="color: #007700">, </span><span style="color: #0000BB">12</span><span style="color: #007700">, </span><span style="color: #0000BB">$black</span><span style="color: #007700">, </span><span style="color: #0000BB">$white</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">);<br /><br /></span><span style="color: #FF8000">// 输出图像并释放内存<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 /><br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</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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</div>
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<div class="refsect1 notes" id="refsect1-function.imagepstext-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数仅在 PHP
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编译时指定了 <strong class="option configure">--with-t1lib[=DIR]</strong>
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时可用。</span></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.imagepstext-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="imagepsbbox.html" class="function" rel="rdfs-seeAlso">imagepsbbox()</a> - 给出一个使用 PostScript Type1 字体的文本方框</span></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> |