Qt&Vtk-010-Cone5

Posted 2021-09-04 DreamLife.

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文章目录

Qt&Vtk-Cone5

Qt&Vtk-Cone5

这个官方示例是个迷，目前在Qt没有跑起来。主要就是用到了vtkInteractorStyleTrackballCamera这个东西。官方的是示例有没有看出啥东西来。

1 代码搬运

1 cone5.h

#ifndef CONE5_H
#define CONE5_H

#include <QWidget>
#include <QTimer>
#include <QDebug>
#include <QString>
#include <QTextBrowser>
#include "QVTKOpenGLWidget.h"               //新版本，旧版QVTKWidget
#include "vtkAutoInit.h"
#include "vtkConeSource.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkInteractorStyleTrackballCamera.h"
#include "vtkPolyDataMapper.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkActor.h"
#include "vtkCamera.h"


namespace Ui {
class Cone5;
}

class Cone5 : public QWidget
{
    Q_OBJECT

public:
    explicit Cone5(QWidget *parent = 0);
    ~Cone5();

    void startiren();


private:
    Ui::Cone5 *ui;

    vtkConeSource *cone = nullptr;

    vtkPolyDataMapper *mapper = nullptr;

    vtkActor *actor = nullptr;

    vtkRenderer *render = nullptr;

    vtkRenderWindowInteractor *iren = nullptr;

    vtkInteractorStyleTrackballCamera *style = nullptr;
};

#endif // CONE5_H

1.2 cone5.cpp

#include "cone5.h"
#include "ui_cone5.h"

Cone5::Cone5(QWidget *parent) :QWidget(parent),ui(new Ui::Cone5)
{
    ui->setupUi(this);

    cone = vtkConeSource::New();
    cone->SetRadius(1);
    cone->SetResolution(100);
    cone->SetHeight(5);


    mapper = vtkPolyDataMapper::New();
    mapper->SetInputConnection(cone->GetOutputPort());


    actor = vtkActor::New();
    actor->SetMapper(mapper);


    render = vtkRenderer::New();
    render->AddActor(actor);
    render->SetBackground(0,1,0);


    ui->widget->GetRenderWindow()->AddRenderer(render);


    iren = vtkRenderWindowInteractor::New();
    iren->SetRenderWindow(ui->widget->GetRenderWindow());


    style = vtkInteractorStyleTrackballCamera::New();
    iren->SetInteractorStyle(style);

    iren->Initialize();
//    iren->Start();                //在Qt中无法跑起来，这里需要看下Start的源码
    /*
    void vtkRenderWindowInteractor::Start()
    {
      // Let the compositing handle the event loop if it wants to.
      if (this->HasObserver(vtkCommand::StartEvent) && !this->HandleEventLoop)
      {
        this->InvokeEvent(vtkCommand::StartEvent,nullptr);
        return;
      }

      // As a convenience, initialize if we aren't initialized yet.
      if (!this->Initialized)
      {
        this->Initialize();

        if (!this->Initialized)
        {
          return;
        }
      }

      // Pass execution to the subclass which will run the event loop,
      // this will not return until TerminateApp is called.
      this->StartEventLoop();
    }
*/
}

Cone5::~Cone5()
{
    delete ui;
}

void Cone5::startiren()
{
    iren->Start();
}

2 运行效果

2.1 需要调整函数调用时机

在Qt下一致运行的时候，发现了个问题，就是如果我在构造函数里面调用iren->Start();话，就会有问题，程序显示启动，但是没有界面出来。所以我看了一下源码中的Start()代码如下

void vtkRenderWindowInteractor::Start()
{
  // Let the compositing handle the event loop if it wants to.
  if (this->HasObserver(vtkCommand::StartEvent) && !this->HandleEventLoop)
  {
    this->InvokeEvent(vtkCommand::StartEvent,nullptr);
    return;
  }

  // As a convenience, initialize if we aren't initialized yet.
  if (!this->Initialized)
  {
    this->Initialize();

    if (!this->Initialized)
    {
      return;
    }
  }

  // Pass execution to the subclass which will run the event loop,
  // this will not return until TerminateApp is called.
  this->StartEventLoop();
}

最后一行，this->StartEventLoop();,虽然我英语不咋地吧，但是感觉这个应该是是一个循环时间，他一直在那循环运行这，所以我的程序一直卡在构造函数中，导致界面无法显示。这里只是猜测，毕竟水平太次，研究不了源码。

解决方法也很简单，就是我单开了一个函数，专门用来启动这个东西，如下

void Cone5::startiren()
{
    iren->Start();
}

完了了在MianWindow中找个地方调用就可以了，我是放在了切换界面的俩面，当切这个画面的时候，调用一下，如下

void MainWindow::on_actionCone5_triggered()
{
    ui->tabWidget_Main->setCurrentIndex(6);
    this->setWindowTitle("Qt&Vtk-Cone5");
    mCone5->startiren();
}