图元吸附
<h1>图元吸附</h1>
<h2>简要描述</h2>
<p>设置图元吸附功能，可以让鼠标事件与图形元素相互作用，使鼠标点吸附到最近的图元上。</p>
<h2>接口</h2>
<p><code>openPointSnap(event)</code></p>
<h3>成员</h3>
<table>
<thead>
<tr>
<th>参数名</th>
<th>必选</th>
<th>类型</th>
<th>说明</th>
</tr>
</thead>
<tbody>
<tr>
<td>event</td>
<td>是</td>
<td>object</td>
<td>鼠标事件对象，包含鼠标移动时的相关信息。</td>
</tr>
</tbody>
</table>
<h3>示例</h3>
<pre><code class="language-javascript">let viewer2DConfig = new BCore.Viewer.Viewer2DConfig();
mViewer2D = new BCore.Viewer.Viewer2D('bcorecontainer-2d', viewer2DConfig);
document.addEventListener('mousemove', (e) =&gt; {
const result = mViewer2D.openPointSnap(e);
console.log(result);
});</code></pre>
<h3>返回值说明</h3>
<table>
<thead>
<tr>
<th>参数名</th>
<th>类型</th>
<th>说明</th>
</tr>
</thead>
<tbody>
<tr>
<td>mindistanceLine</td>
<td>number[]</td>
<td>距事件点最近的线点坐标数组，每三个数表示一个坐标。</td>
</tr>
<tr>
<td>mousepoint</td>
<td>number[]</td>
<td>事件点吸附的坐标，若未吸附则返回鼠标当前位置。</td>
</tr>
</tbody>
</table>
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