vtkMouseCameraTrackballMultiRotateManipulator
<p><code>vtkMouseCameraTrackballMultiRotateManipulator</code> 是 <code>vtk.js</code> 中用于实现多点触控旋转操作的工具。它允许用户通过多点触控(例如使用触摸屏或多点触控鼠标)在 3D 空间中旋转视图。这种操作方式模仿了轨球式的旋转,使得用户可以以更加自然和直观的方式调整视角。</p>
<h3>主要功能</h3>
<ul>
<li><strong>多点触控支持</strong>:支持多个触点的旋转操作,适用于触摸屏和触控设备。</li>
<li><strong>轨球式旋转</strong>:提供类似轨球的旋转效果,使得视角调整更加自然和精确。</li>
<li><strong>用户交互</strong>:通过与用户的触控交互来动态更新视图。</li>
</ul>
<h3>主要方法</h3>
<ol>
<li>
<p><strong><code>constructor()</code></strong></p>
<ul>
<li><strong>描述</strong>:初始化 <code>vtkMouseCameraTrackballMultiRotateManipulator</code> 实例。</li>
<li>
<p><strong>用法</strong>:</p>
<p><code>const multiRotateManipulator = vtkMouseCameraTrackballMultiRotateManipulator.newInstance();</code></p>
</li>
</ul>
</li>
<li>
<p><strong><code>setRenderWindow(renderWindow)</code></strong></p>
<ul>
<li><strong>描述</strong>:将操控器与 <code>vtkRenderWindow</code> 关联。</li>
<li>
<p><strong>用法</strong>:</p>
<p><code>multiRotateManipulator.setRenderWindow(renderWindow);</code></p>
</li>
</ul>
</li>
<li>
<p><strong><code>handleMouseDown(event)</code></strong></p>
<ul>
<li><strong>描述</strong>:处理鼠标按下事件,通常用于启动旋转交互。</li>
<li>
<p><strong>用法</strong>:</p>
<p><code>multiRotateManipulator.handleMouseDown(event);</code></p>
</li>
</ul>
</li>
<li>
<p><strong><code>handleMouseMove(event)</code></strong></p>
<ul>
<li><strong>描述</strong>:处理鼠标移动事件,根据鼠标的移动更新旋转。</li>
<li>
<p><strong>用法</strong>:</p>
<p><code>multiRotateManipulator.handleMouseMove(event);</code></p>
</li>
</ul>
</li>
<li>
<p><strong><code>handleMouseUp(event)</code></strong></p>
<ul>
<li><strong>描述</strong>:处理鼠标释放事件,结束旋转交互。</li>
<li>
<p><strong>用法</strong>:</p>
<p><code>multiRotateManipulator.handleMouseUp(event);</code></p>
</li>
</ul>
</li>
<li>
<p><strong><code>setInteractionStyle(style)</code></strong></p>
<ul>
<li><strong>描述</strong>:设置交互样式,如轨球旋转等。</li>
<li>
<p><strong>用法</strong>:</p>
<p><code>multiRotateManipulator.setInteractionStyle(style);</code></p>
</li>
</ul>
</li>
</ol>
<h3>示例代码</h3>
<pre><code class="language-javascript">import vtk from '@kitware/vtk.js';
import vtkRenderer from '@kitware/vtk.js/Rendering/Core/Renderer';
import vtkRenderWindow from '@kitware/vtk.js/Rendering/Core/RenderWindow';
import vtkRenderWindowInteractor from '@kitware/vtk.js/Rendering/Core/RenderWindowInteractor';
import vtkMouseCameraTrackballMultiRotateManipulator from '@kitware/vtk.js/Interactions/Manipulators/MouseCameraTrackballMultiRotateManipulator';
// 初始化渲染器和渲染窗口
const renderer = vtkRenderer.newInstance();
const renderWindow = vtkRenderWindow.newInstance();
renderWindow.addRenderer(renderer);
// 初始化交互器和多点旋转操控器
const interactor = vtkRenderWindowInteractor.newInstance();
const multiRotateManipulator = vtkMouseCameraTrackballMultiRotateManipulator.newInstance();
interactor.setRenderWindow(renderWindow);
interactor.setManipulator(multiRotateManipulator);
// 开始交互
interactor.initialize();
interactor.start();
</code></pre>
<p>总结</p>
<p>vtkMouseCameraTrackballMultiRotateManipulator 提供了一种基于多点触控的轨球式旋转控制方式,使得用户能够更加自然地调整 3D 场景的视角。这种操控器特别适用于需要精细控制和交互的应用场景。通过与 vtkRenderWindow 和 vtkRenderWindowInteractor 配合使用,可以实现流畅的视图旋转效果。</p>