function.imagesetpixel.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Set a single pixel</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.imagesetbrush.html">imagesetbrush</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.imagesetstyle.html">imagesetstyle</a></div> <div class="up"><a href="ref.image.html">GD Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.imagesetpixel" class="refentry"> <div class="refnamediv"> <h1 class="refname">imagesetpixel</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">imagesetpixel</span> — <span class="dc-title">Set a single pixel</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>imagesetpixel</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$image</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$x</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$y</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$color</tt></span> )</div> <p class="para rdfs-comment"> <b>imagesetpixel()</b> draws a pixel at the specified coordinate. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt><span class="term"><i><tt class="parameter">image</tt></i></span><dd><p class="para">An image resource, returned by one of the image creation functions, such as <a href="function.imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a>.</p></dd></dt> <dt> <span class="term"><i><tt class="parameter">x</tt></i></span> <dd> <p class="para"> x-coordinate. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">y</tt></i></span> <dd> <p class="para"> y-coordinate. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">color</tt></i></span> <dd> <p class="para"> A color identifier created with <a href="function.imagecolorallocate.html" class="function">imagecolorallocate()</a>. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns <b><tt>TRUE</tt></b> on success or <b><tt>FALSE</tt></b> on failure. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>imagesetpixel()</b> example</b></p> <div class="example-contents"><p> A random drawing that ends with a regular picture. </p></div> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br />$x </span><span style="color: #007700">= </span><span style="color: #0000BB">200</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$y </span><span style="color: #007700">= </span><span style="color: #0000BB">200</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$gd </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">);<br /> <br /></span><span style="color: #0000BB">$corners</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">] = array(</span><span style="color: #DD0000">'x' </span><span style="color: #007700">=> </span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #DD0000">'y' </span><span style="color: #007700">=> </span><span style="color: #0000BB">10</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$corners</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">] = array(</span><span style="color: #DD0000">'x' </span><span style="color: #007700">=> </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #DD0000">'y' </span><span style="color: #007700">=> </span><span style="color: #0000BB">190</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$corners</span><span style="color: #007700">[</span><span style="color: #0000BB">2</span><span style="color: #007700">] = array(</span><span style="color: #DD0000">'x' </span><span style="color: #007700">=> </span><span style="color: #0000BB">200</span><span style="color: #007700">, </span><span style="color: #DD0000">'y' </span><span style="color: #007700">=> </span><span style="color: #0000BB">190</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$red </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$gd</span><span style="color: #007700">, </span><span style="color: #0000BB">255</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 />for (</span><span style="color: #0000BB">$i </span><span style="color: #007700">= </span><span style="color: #0000BB">0</span><span style="color: #007700">; </span><span style="color: #0000BB">$i </span><span style="color: #007700">< </span><span style="color: #0000BB">100000</span><span style="color: #007700">; </span><span style="color: #0000BB">$i</span><span style="color: #007700">++) {<br /> </span><span style="color: #0000BB">imagesetpixel</span><span style="color: #007700">(</span><span style="color: #0000BB">$gd</span><span style="color: #007700">, </span><span style="color: #0000BB">round</span><span style="color: #007700">(</span><span style="color: #0000BB">$x</span><span style="color: #007700">),</span><span style="color: #0000BB">round</span><span style="color: #007700">(</span><span style="color: #0000BB">$y</span><span style="color: #007700">), </span><span style="color: #0000BB">$red</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$a </span><span style="color: #007700">= </span><span style="color: #0000BB">rand</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$x </span><span style="color: #007700">= (</span><span style="color: #0000BB">$x </span><span style="color: #007700">+ </span><span style="color: #0000BB">$corners</span><span style="color: #007700">[</span><span style="color: #0000BB">$a</span><span style="color: #007700">][</span><span style="color: #DD0000">'x'</span><span style="color: #007700">]) / </span><span style="color: #0000BB">2</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$y </span><span style="color: #007700">= (</span><span style="color: #0000BB">$y </span><span style="color: #007700">+ </span><span style="color: #0000BB">$corners</span><span style="color: #007700">[</span><span style="color: #0000BB">$a</span><span style="color: #007700">][</span><span style="color: #DD0000">'y'</span><span style="color: #007700">]) / </span><span style="color: #0000BB">2</span><span style="color: #007700">;<br />}<br /> <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">$gd</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="example-contents"><p>The above example will output something similar to:</p></div> <div class="mediaobject"> <div class="imageobject"> <img src="figures/image.imagesetpixel.png" /> </div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.imagecreatetruecolor.html" class="function" rel="rdfs-seeAlso">imagecreatetruecolor()</a></li> <li class="member"><a href="function.imagecolorallocate.html" class="function" rel="rdfs-seeAlso">imagecolorallocate()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.imagesetbrush.html">imagesetbrush</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.imagesetstyle.html">imagesetstyle</a></div> <div class="up"><a href="ref.image.html">GD Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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