c++ vtk 修改目标物颜色之后再恢复原始颜色

在 VTK 中，可以通过修改 vtkActor 的属性来改变目标物体的颜色，可以使用 SetColor 方法来设置颜色。如果需要在修改颜色后恢复原始颜色，可以使用 vtkProperty 来保存原始颜色，并在需要的时候恢复。

以下是一个示例代码，其中修改了一个球体的颜色并在 5 秒后恢复原始颜色：

#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkProperty.h>
#include <vtkSmartPointer.h>

int main()
{
    // 创建球体
    vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New();
    sphereSource->Update();

    // 创建渲染器和窗口
    vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
    mapper->SetInputConnection(sphereSource->GetOutputPort());

    vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
    actor->SetMapper(mapper);
    actor->GetProperty()->SetColor(1, 0, 0); // 设置颜色为红色

    vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
    renderer->AddActor(actor);

    vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
    renderWindow->AddRenderer(renderer);

    vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
    interactor->SetRenderWindow(renderWindow);

    // 保存原始颜色
    vtkSmartPointer<vtkProperty> originalProperty = vtkSmartPointer<vtkProperty>::New();
    originalProperty->DeepCopy(actor->GetProperty());

    // 开始渲染
    renderWindow->Render();

    // 修改颜色并等待 5 秒
    actor->GetProperty()->SetColor(0, 0, 1); // 设置颜色为蓝色
    renderWindow->Render();
    vtkSmartPointer<vtkTimerCallback> timerCallback = vtkSmartPointer<vtkTimerCallback>::New();
    timerCallback->originalProperty = originalProperty;
    timerCallback->actor = actor;
    interactor->AddObserver(vtkCommand::TimerEvent, timerCallback);
    interactor->CreateRepeatingTimer(5000);
    interactor->Start();

    return 0;
}

class vtkTimerCallback : public vtkCommand
{
public:
    static vtkTimerCallback* New()
    {
        return new vtkTimerCallback;
    }

    virtual void Execute(vtkObject* caller, unsigned long eventId, void* callData)
    {
        // 恢复原始颜色
        actor->SetProperty(originalProperty);
        actor->GetProperty()->SetColor(originalProperty->GetColor());
        actor->GetProperty()->SetOpacity(originalProperty->GetOpacity());
        actor->GetProperty()->SetRepresentation(originalProperty->GetRepresentation());
        actor->GetProperty()->SetInterpolation(originalProperty->GetInterpolation());
        actor->GetProperty()->SetSpecular(originalProperty->GetSpecular());
        actor->GetProperty()->SetSpecularPower(originalProperty->GetSpecularPower());

        vtkRenderWindowInteractor* interactor = vtkRenderWindowInteractor::SafeDownCast(caller);
        interactor->DestroyTimer();
    }

    vtkProperty* originalProperty;
    vtkActor* actor;
};

这个示例代码中使用了 vtkTimerCallback 类来在 5 秒后恢复原始颜色。在 Execute 方法中，将目标 actor 的属性设置为 originalProperty，就可以恢复原始颜色。