开发环境:
- Windows 11 家庭中文版
- Microsoft Visual Studio Community 2019
- VTK-9.3.0.rc0
- vtk-example
- 参考代码
demo解决问题 :框选或者点选某一区域,并获取区域prop3D对象(红线内为有效区域,polydata组成的3d几何对象)
1. vtkInteractorStyleRubberBandPick
cpp
/*
与TrackBallCamera类似,但是它可以选择橡皮筋选择矩形下面的道具。
该交互器样式允许用户通过按下'r'并使用左鼠标按钮在渲染窗口中绘制矩形。
当释放鼠标按钮时,附加的拾取器将在选择矩形中心的像素上操作。
如果拾取器恰好是vtkAreaPicker,则它将在整个选择矩形上操作。
当按下'p'键时,上述拾取操作在1x1矩形上发生。在其他方面,它的行为与其父类相同。
另请参见
vtkAreaPicker
*/
// r使能或禁用区域框选,框选区域中pick有效区域
// For vtkInteractorStyleRubberBandPick - use 'r' and left-mouse to draw a
// selection box used to pick.
//
// p按下时,pick当前鼠标位置所在的区域
// For vtkInteractorStyleTrackballCamera - use 'p' to pick at the current
// mouse position.
vtkNew<vtkInteractorStyleRubberBandPick> style;
2. vtkAreaPicker
cpp
vtkNew<vtkAreaPicker> areaPicker;
vtkNew<vtkCallbackCommand> pickCallback;
pickCallback->SetCallback(PickCallbackFunction);
areaPicker->AddObserver(vtkCommand::EndPickEvent, pickCallback);
prj name: AreaPicking
cpp
#include <vtkActor.h>
#include <vtkAreaPicker.h>
#include <vtkCallbackCommand.h>
#include <vtkCellArray.h>
#include <vtkInteractorStyleRubberBandPick.h>
#include <vtkInteractorStyleTrackball.h>
// #include <vtkInteractorStyleTrackballCamera.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProp3DCollection.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
namespace {
void PickCallbackFunction(vtkObject* caller, long unsigned int eventId,
void* clientData, void* callData);
}
int main(int, char*[])
{
// Create a set of points.
vtkNew<vtkPoints> points;
vtkNew<vtkCellArray> vertices;
vtkIdType pid[1];
pid[0] = points->InsertNextPoint(1.0, 0.0, 0.0);
vertices->InsertNextCell(1, pid);
pid[0] = points->InsertNextPoint(0.0, 0.0, 0.0);
vertices->InsertNextCell(1, pid);
pid[0] = points->InsertNextPoint(0.0, 1.0, 0.0);
vertices->InsertNextCell(1, pid);
// Create a polydata
vtkNew<vtkPolyData> polydata;
polydata->SetPoints(points);
polydata->SetVerts(vertices);
// Visualize
vtkNew<vtkPolyDataMapper> mapper;
mapper->SetInputData(polydata);
vtkNew<vtkNamedColors> colors;
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
actor->GetProperty()->SetPointSize(8); //设置顶点的显示大小
actor->GetProperty()->SetColor(colors->GetColor3d("Gold").GetData()); //设置顶点的显示颜色
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
renderWindow->SetWindowName("AreaPicking");
vtkNew<vtkAreaPicker> areaPicker;
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
renderWindowInteractor->SetPicker(areaPicker);
renderer->AddActor(actor);
renderer->SetBackground(colors->GetColor3d("DarkSlateGray").GetData());
renderWindow->Render();
// r使能或禁用区域框选,框选区域中pick有效区域
// For vtkInteractorStyleRubberBandPick - use 'r' and left-mouse to draw a
// selection box used to pick.
vtkNew<vtkInteractorStyleRubberBandPick> style;
// p按下时,pick当前鼠标位置所在的区域
// For vtkInteractorStyleTrackballCamera - use 'p' to pick at the current
// mouse position.
// vtkNew<vtkInteractorStyleTrackballCamera> style;
// paraview
style->SetCurrentRenderer(renderer);
renderWindowInteractor->SetInteractorStyle(style);
vtkNew<vtkCallbackCommand> pickCallback;
pickCallback->SetCallback(PickCallbackFunction);
areaPicker->AddObserver(vtkCommand::EndPickEvent, pickCallback);
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
namespace {
void PickCallbackFunction(vtkObject* caller,
long unsigned int vtkNotUsed(eventId),
void* vtkNotUsed(clientData),
void* vtkNotUsed(callData))
{
std::cout << "Pick." << std::endl;
vtkAreaPicker* areaPicker = static_cast<vtkAreaPicker*>(caller);
vtkProp3DCollection* props = areaPicker->GetProp3Ds();
props->InitTraversal();
//遍历当权pick到那些区域(Prop3Ds)
for (vtkIdType i = 0; i < props->GetNumberOfItems(); i++)
{
vtkProp3D* prop = props->GetNextProp3D();
std::cout << "Picked prop: " << prop << std::endl;
}
}
} // namespace