VTK 随笔一 ，使用Qt + vtk 画一条直线

1、创建qt工程不做赘述。

2、创建一个类继承QVTKOpenGLNativeWidget  （这个是vtk给qt项目准备的），此类可以是空类，vtkView.cpp 只要实现构造就可以。

#pragma once

#include <QVTKOpenGLNativeWidget.h>

#include <QObject>

class vtkView : public QVTKOpenGLNativeWidget
{
    Q_OBJECT
public:
    vtkView(QWidget *parent = nullptr);
    ~vtkView();
};

3、创建一个布局类，用于显示布局，我使用MainWindown，之间作为布局类，具体实现如下

#pragma once

#include <QGridLayout>
#include <QWidget>

class MainWindown : public QWidget
{
    Q_OBJECT

public:
    MainWindown(QWidget *parent = nullptr);
    ~MainWindown();
    void initUI();
    QWidget *makeVTKWgt();
};

　　

#include "MainWindown.h"

#include <vtkActor.h>
#include <vtkAutoInit.h>
#include <vtkDataSetMapper.h>
#include <vtkLineSource.h>
#include <vtkPlaneSource.h>
#include <vtkPolyData.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

#include "vtkView.h"

MainWindown::MainWindown(QWidget *parent)
    : QWidget(parent)
{
    setFixedSize(800, 800);
    initUI();
}

MainWindown::~MainWindown() {}

void MainWindown::initUI()
{
    QGridLayout *grid = new QGridLayout();

    grid->addWidget(makeVTKWgt(), 0, 0);
    grid->addWidget(makeVTKWgt(), 0, 1);
    setLayout(grid);
}
#include "vtkImageData.h"
void aa()
{
    vtkImageData *img;
    img->GetDimensions();
    img->GetSpacing();
}
QWidget *MainWindown::makeVTKWgt()
{
    double p0[3] = {100.0, 100.0, 0.0};
    double p1[3] = {300.0, 300.0, 0.0};

    vtkLineSource *line = vtkLineSource::New();
    line->SetPoint1(p0);
    line->SetPoint2(p1);
    line->Update();

    vtkDataSetMapper *mapper = vtkDataSetMapper::New();
    mapper->SetInputConnection(line->GetOutputPort());

    vtkActor *lineActor = vtkActor::New();
    lineActor->SetMapper(mapper);
    lineActor->GetProperty()->SetColor(1, 0, 0);
    lineActor->GetProperty()->SetLineWidth(3);

    vtkRenderer *renderer = vtkRenderer::New();
    renderer->AddActor(lineActor);

    //    vtkRenderWindow *rendererWindow = vtkRenderWindow::New();
    //    rendererWindow->AddRenderer(renderer);
    //    rendererWindow->Render();

    //    vtkRenderWindowInteractor *inter = vtkRenderWindowInteractor::New();
    //    inter->SetRenderWindow(rendererWindow);
    //    inter->Start();

    vtkView *wgt = new vtkView(this);
    // wgt->setFixedSize(400, 400);
    wgt->renderWindow()->AddRenderer(renderer);
    wgt->renderWindow()->Render();
    return wgt;
}

4、效果图展示