VTK读取数据
阅读原文时间:2023年07月12日阅读:1

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include

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

#include
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 points = vtkSmartPointer::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 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
#include
#include
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, ‘,’);


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。

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