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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: WebGLRenderingContext.scissor()
+slug: Web/API/WebGLRenderingContext/scissor
+tags:
+ - WebGL
+translation_of: Web/API/WebGLRenderingContext/scissor
+---
+<div>{{APIRef("WebGL")}}</div>
+
+<p> <strong><code>WebGLRenderingContext.scissor()</code></strong> 方法指定了一个裁剪区域,用来将绘图区域限制在其限定的盒形区域内。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate"><var><em>void gl</em>.</var>scissor<var>(x, y, width, height);</var>
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>x</code></dt>
+ <dd>{{domxref("GLint")}} ,指定盒形裁剪区域左下角所在的横坐标,默认为 0。</dd>
+ <dt><code>y</code></dt>
+ <dd> {{domxref("GLint")}} 指定盒形裁剪区域左下角的纵坐标,默认为 0。</dd>
+ <dt>width</dt>
+ <dd>{{domxref("Glsizei")}},用来确定盒型裁剪区域宽度的非负数,默认为 canvas 的宽度。</dd>
+ <dt>height</dt>
+ <dd>{{domxref("Glsizei")}} ,用以指定盒形裁剪区域高度的非负数,默认为canvas 的高度。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>无。</p>
+
+<h3 id="抛错">抛错</h3>
+
+<p>宽或高为负值时,抛出  <code>gl.INVALID_VALUE</code> 错误。</p>
+
+<h2 id="示例">示例</h2>
+
+<p>当裁剪区域可用的时候,只有处于此区域内的像素才能由绘图命令修改。</p>
+
+<pre class="brush: js notranslate">// turn on scissor test
+gl.enable(gl.SCISSOR_TEST);
+
+// set the scissor rectangle
+gl.scissor(x, y, width, height);
+
+// execute drawing commands in the scissor box (e.g. clear)
+
+// turn off scissor test again
+gl.disable(gl.SCISSOR_TEST);
+</pre>
+
+<p>通过查询 <code>SCISSOR_BOX</code> 常量来获取裁剪区域的维度信息,返回值是一个 {{jsxref("Int32Array")}} 对象。</p>
+
+<pre class="brush: js notranslate">gl.scissor(0, 0, 200, 200);
+gl.getParameter(gl.SCISSOR_BOX);
+// Int32Array[0, 0, 200, 200]</pre>
+
+<h2 id="标准">标准</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('WebGL', "#5.14.4", "scissor")}}</td>
+ <td>{{Spec2('WebGL')}}</td>
+ <td>Initial definition.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('OpenGL ES 2.0', "glScissor.xml", "glScissor")}}</td>
+ <td>{{Spec2('OpenGL ES 2.0')}}</td>
+ <td>Man page of the OpenGL API.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("api.WebGLRenderingContext.scissor")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{domxref("WebGLRenderingContext.viewport()")}}</li>
+ <li>{{domxref("WebGLRenderingContext.enable()")}}</li>
+ <li>{{domxref("WebGLRenderingContext.disable()")}}</li>
+</ul>