VTK读取数据

#include <vtkSmartPointer.h>
#include <vtkSimplePointsReader.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>
#include <vtkVertexGlyphFilter.h>

//不添加以下代码，不能运行
#ifndef INITIAL_OPENGL
#define INITIAL_OPENGL

#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL2)
VTK_MODULE_INIT(vtkInteractionStyle)
#endif

using namespace std;
//删除字符串中空格，制表符tab等无效字符
string Trim(string& str)
{
    //str.find_first_not_of(" \t\r\n"),在字符串str中从索引0开始，返回首次不匹配"\t\r\n"的位置
    str.erase(0, str.find_first_not_of(" \t\r\n"));
    str.erase(str.find_last_not_of(" \t\r\n") + 1);
    return str;
}

int main()
{
    vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
    double x, y, z;
    ifstream fin("D:\\QTData\\Vtk-new\\ceshi.csv"); //打开文件流操作-绝对路径
    string line;
    while (getline(fin, line))   //整行读取，换行符“\n”区分，遇到文件尾标志eof终止读取
    {
        //cout <<"原始字符串："<< line << endl; //整行输出
        istringstream sin(line); //将整行字符串line读入到字符串流istringstream中
        vector<string> fields; //声明一个字符串向量
        string field;
        while (getline(sin, field, ',')) //将字符串流sin中的字符读入到field字符串中，以逗号为分隔符
        {
            fields.push_back(field); //将刚刚读取的字符串添加到向量fields中
        }

        string sx = Trim(fields[0]);
        string sy = Trim(fields[1]);
        string sz = Trim(fields[2]);

        //字符串转换成double型数字
        istringstream streamx, streamy, streamz;
        streamx.str(sx), streamy.str(sy), streamz.str(sz);
        streamx >> x, streamy >> y, streamz >> z;
        points->InsertNextPoint(x, y, z); //新读取的数据赋予点的几何结构
    }
    fin.close();  //关闭文件
    vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::New();
    polyData->SetPoints(points);

    vtkSmartPointer<vtkVertexGlyphFilter> glyphFilter = vtkSmartPointer<vtkVertexGlyphFilter>::New();
#if VTK_MAJOR_VERSION <= 5
    glyphFilter->SetInputConnection(polyData->GetProducerPort());
#else
    glyphFilter->SetInputData(polyData);
#endif
    glyphFilter->Update();

    // Visualize
    vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
    mapper->SetInputConnection(glyphFilter->GetOutputPort());

    vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
    actor->SetMapper(mapper);
    actor->GetProperty()->SetPointSize(4);
    actor->GetProperty()->SetColor(0.0, 0.0, 0.0);

    vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
    renderer->AddActor(actor);
    renderer->SetBackground(1.3, 1.6, 1.3); // Background color green

    vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
    renderWindow->AddRenderer(renderer);

    vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
    renderWindowInteractor->SetRenderWindow(renderWindow);

    renderWindow->Render();
    renderWindowInteractor->Start();

    return EXIT_SUCCESS;
}

数据源csv格式。

输出成果：

注解：

1. 关于 istringstream 的使用方法：

　　1） 构造函数

istringstream::istringstream(string str);
streamx.str(); //获取字符串内容
streamx>>x; //转化为double。

　　2） 举例

#include <iostream>
#include <sstream>
#include <string>
using namespace std;
int main(){
    string s = "ab,cd,e,fg,h";
    int n = s.size();
    for (int i = 0; i < n; ++i){
        if (s[i] == ','){
            s[i] = ' ';
        }
    }
    istringstream out(s);
    string str;
    while (out >> str){
        cout << str <<' ';
    }
    cout << endl;
}

2. getline的用法

　　区分：cin 遇到空格，制表符等会停止读取空白字表符。

　　举例：

 getline(cin, name， ‘，’);

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本文引用：https://blog.csdn.net/u013232740/article/details/50830165

istringstream - C++参考 (cplusplus.com)

以上代码亲测实践。