VTK读取数据
#include#include #include #include #include #include #include #include #include #include #include #include <string> #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<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 polyData = vtkSmartPointer ::New(); polyData->SetPoints(points); vtkSmartPointer glyphFilter = vtkSmartPointer ::New(); #if VTK_MAJOR_VERSION <= 5 glyphFilter->SetInputConnection(polyData->GetProducerPort()); #else glyphFilter->SetInputData(polyData); #endif glyphFilter->Update(); // Visualize vtkSmartPointer mapper = vtkSmartPointer ::New(); mapper->SetInputConnection(glyphFilter->GetOutputPort()); vtkSmartPointer actor = vtkSmartPointer ::New(); actor->SetMapper(mapper); actor->GetProperty()->SetPointSize(4); actor->GetProperty()->SetColor(0.0, 0.0, 0.0); vtkSmartPointer renderer = vtkSmartPointer ::New(); renderer->AddActor(actor); renderer->SetBackground(1.3, 1.6, 1.3); // Background color green vtkSmartPointer renderWindow = vtkSmartPointer ::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer renderWindowInteractor = vtkSmartPointer ::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 <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, ‘,’);
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。