Qt&Vtk-005-Arrays

#ifndef MARRAYS_H
#define MARRAYS_H
#include <QWidget>
#include "QVTKOpenGLWidget.h"               //新版本，旧版QVTKWidget
#include "vtkAutoInit.h"
#include "vtkActor.h"
#include "vtkCellArray.h"
#include "vtkDoubleArray.h"
#include "vtkFloatArray.h"
#include "vtkIntArray.h"
#include "vtkNamedColors.h"
#include "vtkNew.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include "vtkPolyDataMapper.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include <array>
namespace Ui {
class MArrays;
}
class MArrays : public QWidget
{
    Q_OBJECT
public:
    explicit MArrays(QWidget *parent = 0);
    ~MArrays();
private:
    Ui::MArrays *ui;
    vtkNew<vtkNamedColors> colors;              //新建颜色对象
    vtkNew<vtkDoubleArray> pcoords;             //新建Double数组
    std::array<std::array<double,3>,4> pts = {{{{0.0, 0.0, 0.0}},
                                               {{0.0, 1.0, 0.0}},
                                               {{1.0, 0.0, 0.0}},
                                               {{1.0, 1.0, 0.0}}}};     //新建Double 二维数组
    vtkNew<vtkPoints> points;                   //新建坐标点
    vtkNew<vtkCellArray> strips;                //暂时不清楚
    vtkNew<vtkIntArray> temperature;            //暂时不了解
    vtkNew<vtkDoubleArray> vorticity;           //Double 数组
    vtkNew<vtkPolyData> polydata;               //PolyData格式的数据
    vtkNew<vtkPolyDataMapper> mapper;           //映射器
    vtkNew<vtkActor> actor;                     //就是Actor
    vtkNew<vtkRenderer> render;                 //渲染
};
#endif // MARRAYS_H

#include "marrays.h"
#include "ui_marrays.h"
#include <QDebug>
MArrays::MArrays(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::MArrays)
{
    ui->setupUi(this);
    pcoords->SetNumberOfComponents(3);          //实例中说是设置其组件数为3，默认为1，这里还不明白
    pcoords->SetNumberOfTuples(4);              //设置pcoords可以容纳4个Tuples数据
    for (auto i = 0ul;i<pts.size();++i) {       //把数据加进去
        pcoords->SetTuple(i,pts[i].data());
    }
    points->SetData(pcoords);                   //我理解就是数据放进这个点数组里面
    strips->InsertNextCell(4);                  //这个干啥还不清楚
    strips->InsertCellPoint(0);
    strips->InsertCellPoint(1);
    strips->InsertCellPoint(2);
    strips->InsertCellPoint(3);
//    temperature->SetName("Temperature");      //这个为啥要设置名字，咱也不懂，先撸为敬
                                                //测试这个和颜色有关系
    temperature->InsertNextValue(10);
    temperature->InsertNextValue(20);
    temperature->InsertNextValue(50);
    temperature->InsertNextValue(80);
//    vorticity->SetName("Vorticity");          //这个为啥要设置名字，咱也不懂，先撸为敬
    vorticity->InsertNextValue(1.0);
    vorticity->InsertNextValue(1.0);
    vorticity->InsertNextValue(1.0);
    vorticity->InsertNextValue(1.0);
    polydata->SetPoints(points);
    polydata->SetStrips(strips);
    polydata->GetPointData()->SetScalars(temperature);      //官方文档中就一句话，设置标量数据，啥是标量数据呀，咋就能修改颜色了
    polydata->GetPointData()->AddArray(vorticity);
    mapper->SetInputData(polydata);         //映射器输入数据
    mapper->SetScalarRange(0,80);           //又一个Scalar 也能影响颜色，这尼玛，这个好像是要区我们temperature中的区一部分吧
    actor->SetMapper(mapper);               //
    render->AddActor(actor);                //添加actor
    render->SetBackground(colors->GetColor3d("DarkSlateGray").GetData());   //设置渲染背景
    ui->widget->GetRenderWindow()->AddRenderer(render);         //添加渲染器
}
MArrays::~MArrays()
{
    delete ui;
}