Qt&Vtk-008-Cone3

文章目录

Qt&Vtk-Cone3

1 代码搬运

1.1 cone3.h

1.2 cone3.cpp

2 运行效果

3 知识点

★ 源码 ★

今天接着搬运官方实例代码，还是老朋友Cone。今天要实现的就是下图中的实例。粗略看就是两个Cone吱吱转。这个Demo主要显示了如何在一个窗口中显示多个渲染场景

看了下官方实例中的代码，就是新建了两个传染窗口，那么我也这么搞起来。还是在前面的ThirdVtk框架下搞起来。

#ifndef CONE3_H
#define CONE3_H

#include <QWidget>
#include <QTimer>
#include "QVTKOpenGLWidget.h"               //新版本，旧版QVTKWidget
#include "vtkAutoInit.h"
#include "vtkConeSource.h"
#include "vtkPolyDataMapper.h"
#include "vtkRenderWindow.h"
#include "vtkCamera.h"
#include "vtkActor.h"
#include "vtkRenderer.h"
namespace Ui {
class Cone3;
}

class Cone3 : public QWidget
{
    Q_OBJECT

public:
    explicit Cone3(QWidget *parent = 0);
    ~Cone3();

private:
    Ui::Cone3 *ui;

    vtkConeSource *cone = nullptr;                  //声明椎体

    vtkPolyDataMapper *coneMapper = nullptr;        //声明映射器

    vtkActor *coneActor = nullptr;                  //声明Actor

    vtkRenderer *coneRender1 = nullptr,*coneRender2 = nullptr;              //声明渲染器

    QTimer *rotationTimer = nullptr;                //声明定时器，用于旋转椎体
};

#endif // CONE3_H

      

#include "cone3.h"
#include "ui_cone3.h"

Cone3::Cone3(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Cone3)
{
    ui->setupUi(this);


    cone = vtkConeSource::New();    //新建对象

    cone->SetHeight(3.0);           //设置高度
    cone->SetRadius(1.0);           //设置半径
    cone->SetResolution(20);        //翻译为设置分辨率，其实这个是设置椎体的面数的

    coneMapper = vtkPolyDataMapper::New();          //新建映射器
    coneMapper->SetInputConnection(cone->GetOutputPort());  //设置Cone输出coneMapper数据输入

    //新建Actor，并设置映射器
    coneActor = vtkActor::New();
    coneActor->SetMapper(coneMapper);
    //新建渲染器并设置Actor和背景颜色
    coneRender1 = vtkRenderer::New();
    coneRender1->AddActor(coneActor);
    coneRender1->SetBackground(0.1,0.2,0.3);
    coneRender1->SetViewport(0.0,0.0,0.5,1.0);

    coneRender2 = vtkRenderer::New();
    coneRender2->AddActor(coneActor);
    coneRender2->SetBackground(0.7,0.1,0.1);
    coneRender2->SetViewport(0.5,0.0,1.0,1.0);
    //获取渲染窗口

    ui->widget_Cone1->GetRenderWindow()->AddRenderer(coneRender1);
    ui->widget_Cone1->GetRenderWindow()->AddRenderer(coneRender2);
    //旋转椎体
    rotationTimer = new QTimer();
    connect(rotationTimer,&QTimer::timeout,this,[=](){
        coneRender1->GetActiveCamera()->Azimuth(1);
        coneRender2->GetActiveCamera()->Azimuth(2);
        ui->widget_Cone1->GetRenderWindow()->Render();//注意这句话，要加上呀，不然人不给你转，惰性渲染。
    });

    rotationTimer->start(25);

}

Cone3::~Cone3()
{
    rotationTimer->stop();
    delete ui;
}

      

这个其实就是靠着两个渲染器来搞定的，两个通过不同的VIewPort（）来实现的，关键代码如下

coneRender1 = vtkRenderer::New();
    coneRender1->AddActor(coneActor);
    coneRender1->SetBackground(0.1,0.2,0.3);
    coneRender1->SetViewport(0.0,0.0,0.5,1.0);

    coneRender2 = vtkRenderer::New();
    coneRender2->AddActor(coneActor);
    coneRender2->SetBackground(0.7,0.1,0.1);
    coneRender2->SetViewport(0.5,0.0,1.0,1.0);