vtk 中通过按键移动相机位置的例子 c++
时间: 2023-07-08 16:17:44 浏览: 251
相机移动到指定位置
以下是使用 VTK 中按键移动相机位置的例子代码(C++):
```cpp
#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkPolyDataMapper.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
// 定义按键事件处理类
class KeyPressInteractorStyle : public vtkInteractorStyleTrackballCamera
{
public:
static KeyPressInteractorStyle* New();
vtkTypeMacro(KeyPressInteractorStyle, vtkInteractorStyleTrackballCamera);
virtual void OnKeyPress() override
{
// 获取按下的键
vtkRenderWindowInteractor* interactor = this->Interactor;
std::string key = interactor->GetKeySym();
// 根据按下的键调整相机位置和方向
if (key == "Up")
{
this->CameraRoll(10.0);
}
else if (key == "Down")
{
this->CameraRoll(-10.0);
}
else if (key == "Left")
{
this->CameraAzimuth(-10.0);
}
else if (key == "Right")
{
this->CameraAzimuth(10.0);
}
else if (key == "w")
{
this->CameraDolly(1.1);
}
else if (key == "s")
{
this->CameraDolly(0.9);
}
// 更新渲染器
this->Interactor->GetRenderWindow()->Render();
}
};
vtkStandardNewMacro(KeyPressInteractorStyle);
int main()
{
// 创建一个球形
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->Update();
// 创建渲染器和窗口
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
// 创建交互器和按键事件处理类
vtkSmartPointer<KeyPressInteractorStyle> interactorStyle =
vtkSmartPointer<KeyPressInteractorStyle>::New();
vtkSmartPointer<vtkRenderWindowInteractor> interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);
interactor->SetInteractorStyle(interactorStyle);
// 将球形添加到渲染器中
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
renderer->AddActor(actor);
// 设置相机初始位置
vtkSmartPointer<vtkCamera> camera =
vtkSmartPointer<vtkCamera>::New();
camera->SetPosition(0, 0, 5);
renderer->SetActiveCamera(camera);
// 启动交互器
renderWindow->Render();
interactor->Initialize();
interactor->Start();
return 0;
}
```
这个例子中,我们创建了一个球形并将其添加到渲染器中,然后设置相机的初始位置。接下来,我们定义了一个按键事件处理类,根据按下的按键来调整相机的位置和方向。最后,我们将按键事件处理类连接到交互器中,并启动交互器。在运行程序后,可以使用方向键和 w、s 键来移动相机的位置和方向。
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