vtk.js

vtk.js


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>

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