意图
我编写了一个 VTK 应用程序,它使用 vtkPoints > vtkPolyLine > vtkPolyData > vtkPolyDataMapper 生成螺旋并显示它。如果在程序初始化时静态完成,则效果很好。
现在,我想动态添加新的数据点。目的是实时可视化测量结果,因此将按一定的时间间隔添加新数据。
Issues
目前,我刚刚实现了一个 TimerEvent 来更新 vtkPoints 和 vtkPolyLine。但是,该程序仅显示 vtkRenderWindowInteractor 启动之前生成的静态数据。我还尝试对几乎所有对象使用“Modified()”和“Update()”调用,尝试删除、重新生成并向渲染器添加新演员 - 但没有成功!我在下面添加了我的 C++ 代码...
相关问题
以下邮件列表问题是关于此问题的,但给出的解决方案对我不起作用:http://public.kitware.com/pipermail/vtkusers/2006-November/038377.html http://public.kitware.com/pipermail/vtkusers/2006-November/038377.html
以下问题似乎相关,但没有有用的答案:VTK:在每个模拟时间步更新渲染窗口中的数据点 https://stackoverflow.com/questions/33504846/vtk-update-data-points-in-renderwindow-at-every-simulation-timestep
问题
- 如何告诉VTK vtkPolyData对象已经改变?
- 我应该仔细查看哪一个 VTK 用户指南?
详细信息/源代码
我使用的是 Visual Studio Community 2017 和 VTK 8.0.0,两者都编译为 Win32 目标。
#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkRenderingContextOpenGL2);
VTK_MODULE_INIT(vtkRenderingVolumeOpenGL2);
VTK_MODULE_INIT(vtkInteractionStyle);
VTK_MODULE_INIT(vtkRenderingFreeType);
#include <vtkSmartPointer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkConeSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkProperty.h>
#include <vtkPoints.h>
#include <vtkPolyLine.h>
vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
vtkSmartPointer<vtkPolyLine> polyLine = vtkSmartPointer<vtkPolyLine>::New();
int numOfPoints = 0;
double t = 0;
void NextPoint() {
double x = t * cos(t);
double y = t * sin(t);
points->InsertNextPoint(x, y, t);
polyLine->GetPointIds()->InsertNextId(numOfPoints);
numOfPoints++;
t += 0.1;
}
vtkSmartPointer<vtkPolyData> generateEllipse() {
// Add some points so we actually see something at all...
for (int i = 0; i < 100; ++i) {
NextPoint();
}
vtkSmartPointer<vtkCellArray> cells = vtkSmartPointer<vtkCellArray>::New();
cells->InsertNextCell(polyLine);
vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::New();
polyData->SetPoints(points);
polyData->SetLines(cells);
return polyData;
}
class vtkTimerCallback : public vtkCommand
{
public:
static vtkTimerCallback *New()
{
vtkTimerCallback *cb = new vtkTimerCallback;
cb->TimerCount = 0;
return cb;
}
virtual void Execute(vtkObject *vtkNotUsed(caller), unsigned long eventId,
void *vtkNotUsed(callData))
{
if (vtkCommand::TimerEvent == eventId)
{
NextPoint(); // Add another point to polyData
++this->TimerCount;
cout << this->TimerCount << endl;
}
}
private:
int TimerCount;
};
int main(int argc, char** argv) {
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
vtkSmartPointer<vtkRenderWindowInteractor> rwi = vtkSmartPointer<vtkRenderWindowInteractor>::New();
rwi->SetRenderWindow(renderWindow);
vtkSmartPointer<vtkPolyData> data = generateEllipse();
vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputData(data);
vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->GetProperty()->SetDiffuseColor(255, 255, 0);
vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
renderWindow->AddRenderer(renderer);
renderer->AddActor(actor);
renderer->ResetCamera();
renderWindow->Render();
// Add Timer Event...
rwi->Initialize();
vtkSmartPointer<vtkTimerCallback> cb = vtkSmartPointer<vtkTimerCallback>::New();
rwi->AddObserver(vtkCommand::TimerEvent, cb);
int timerId = rwi->CreateRepeatingTimer(100); // every 100ms
std::cout << "timerId: " << timerId << std::endl;
// Start Displaying...
rwi->Start();
return 0;
}