VTK在2维图片上显示标记点

在鼠标点击的位置显示一个标记点：

步骤是：

  获得鼠标点的坐标位置，然后以这个点为圆心画一个polygon，设置它的大小和颜色显示，作为actor添加进去渲染就可以了；

vtkSmartPointer<vtkRegularPolygonSource> polygonSource = vtkSmartPointer<vtkRegularPolygonSource>::New(); polygonSource->SetNumberOfSides(50); polygonSource->SetRadius(4); polygonSource->SetCenter(x, y, 0);//this part vtkSmartPointer<vtkPolyDataMapper2D> mapper = vtkSmartPointer<vtkPolyDataMapper2D>::New(); mapper->SetInputConnection(polygonSource->GetOutputPort()); vtkSmartPointer<vtkActor2D> actor = vtkSmartPointer<vtkActor2D>::New(); actor->SetMapper(mapper); actor->GetProperty()->SetColor(1, 0, 0); actor->GetProperty()->SetOpacity(1);