如何使用Opengl庫從文本文件顯示3D點

Question

我想繪製由文本文件中列[0]的值指定的3D點。例如，列[0]等於2，然後顯示以下三維點（xyz）：（1.529,0.25，-2.038），（1.530,0.253，-2.040），（1.530,0.253，-2.044）

的test.txt

1 1.529 0.253 -2.038

1 1.529 0.253 -2.038

2 1.529 0.253 -2.038

2 1.530 0.253 -2.040

2 1.530 0.253 -2.044

3 1.532 0.254 -2.038

3 1.533 0.255 -2.036

3 1.533 0.255 -2.036

3 1.534 0.255 -2.036

3 1.534 0.255 -2.036

這是我的代碼

#include <Windows.h> 
#include <GL\glew.h> 
#include <GL\freeglut.h> 
#include <stdio.h> 
#include <vector> 
#include <stdlib.h> 
#include <fstream> 
#include <iostream> 
#include <sstream> 
#include <string> 

using namespace std; 

char title[] = "Point"; 

void initGL() { 
    glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // Set background color to black 
    glClearDepth(1.0f);     // Set background depth to farthest 
    glEnable(GL_DEPTH_TEST); // Enable depth testing for z-culling 
    glDepthFunc(GL_LEQUAL); // Set the type of depth-test 
    glShadeModel(GL_SMOOTH); // Enable smooth shading 
    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); 
} 

void display() { 

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear color and depth buffers 
    glMatrixMode(GL_MODELVIEW);  // To operate on model-view matrix 
    glLoadIdentity();     // Reset the model-view matrix 
    glTranslatef(1.5f, 0.0f, -7.0f); // Move right and into the screen 

    vector<vector<double>> tempdouble; 
    ifstream in("test.txt"); 
    string line; 

    double Dstage1x = 0.0; 
    double Dstage1y = 0.0; 
    double Dstage1z = 0.0; 
    double Dstage2x = 0.0; 
    double Dstage2y = 0.0; 
    double Dstage2z = 0.0; 
    double Dstage3x = 0.0; 
    double Dstage3y = 0.0; 
    double Dstage3z = 0.0; 
    int ii = 0; 
    int stage1 = 0; 
    int stage2 = 0; 
    int stage3 = 0; 

    while (std::getline(in, line)) 
    { 
     tempdouble.push_back(vector<double>()); 
     stringstream ss(line); 
     double num; 
     while (ss >> num) 
     { 
      tempdouble.back().push_back(num); 
     } 
    } 

    for (int i = 0; i < tempdouble.size(); i++) 
    { 
     for (int j = 0; j < tempdouble[i].size(); j++) 
     { 

      int st1_x=0; int st1_y=0; int st1_z=0; 
      int st2_x=0; int st2_y=0; int st2_z=0; 
      int st3_x=0; int st3_y=0; int st3_z=0; 

      if(tempdouble[i][0]==1) 
      { 

       glPointSize(5);glColor3f(1.0f, 0.5f, 0.0f); 
       glBegin(GL_POINTS); 


       st1_x += Dstage1x*0; st1_y += Dstage1y*0; st1_z += Dstage1z*0; //set value 
       Dstage1x = st1_x + tempdouble[i][1]; 
       Dstage1y = st1_y + tempdouble[i][2]; 
       Dstage1z = st1_z + tempdouble[i][3]; 
       stage1++; 
       //cout <<"Check tempdouble[i][0] state1 : " << tempdouble[i][0] <<"\t"<<endl; 

       cout << "state1(xyz) : " << "(" << Dstage1x << " ," << Dstage1y << "," << Dstage1z << ")"<< endl; 
       glVertex3f(Dstage1x, Dstage1y, Dstage1z); 
       //glVertex3f(tempdouble[i][1], tempdouble[i][2], tempdouble[i][3]); 
       //glVertex3f(tempdouble[i][j], tempdouble[i][j], tempdouble[i][j]); 
       glEnd(); 
       break; 

      } 

      if (tempdouble[i][0] == 2) { 

       glPointSize(5);glColor3f(0.0f, 0.0f, 1.0f); 
       glBegin(GL_POINTS); 

       st2_x += Dstage2x * 0; st2_y += Dstage2y*0; st2_z += Dstage2z*0; //set value 

       Dstage2x = st2_x + tempdouble[i][1]; 
       Dstage2y = st2_y + tempdouble[i][2]; 
       Dstage2z = st2_z + tempdouble[i][3]; 
       stage2++; 
       cout << "state2(xyz) : " << "(" << Dstage2x << " ," << Dstage2y << "," << Dstage2z << ")"<< endl; 

       glVertex3f(Dstage2x,Dstage2y,Dstage2z); 
       //glVertex3f(tempdouble[i][1], tempdouble[i][2], tempdouble[i][3]); 
       //glVertex3f(tempdouble[i][j], tempdouble[i][j], tempdouble[i][j]); 
       glEnd();  
       break; 
      } 

      if (tempdouble[i][0] == 3) { 
       glPointSize(5); glColor3f(1.0f, 0.0f, 0.0f); 
       glBegin(GL_POINTS); 


       st3_x += Dstage3x*0; st3_y += Dstage3y*0; st3_z += Dstage3z*0; //set value 

       Dstage3x = st3_x + tempdouble[i][1]; 
       Dstage3y = st3_y + tempdouble[i][2]; 
       Dstage3z = st3_z + tempdouble[i][3]; 
       stage3++; 
       cout << "state3(xyz) : " << "(" << Dstage3x << " ," << Dstage3y << "," << Dstage3z << ")"<< endl; 

       glVertex3f(Dstage3x,Dstage3y,Dstage3z); 
       //glVertex3f(tempdouble[i][0],tempdouble[i][1],tempdouble[i][2]); 
       //glVertex3f(tempdouble[i][j], tempdouble[i][j], tempdouble[i][j]); 
       glEnd(); 
       break; 
      } 

     } 

    } 
    cout << "stage 1: "<< stage1 << endl; 
    cout << "stage 2: "<<stage2 << endl; 
    cout << "stage 3: "<<stage3 << endl; 
    glutSwapBuffers(); // Swap the front and back frame buffers (double buffering) 
} 

void reshape(GLsizei width, GLsizei height) { // GLsizei for non-negative integer 
    // Compute aspect ratio of the new window 
    if (height == 0) height = 1;    // To prevent divide by 0 
    GLfloat aspect = (GLfloat)width/(GLfloat)height; 

    // Set the viewport to cover the new window 
    glViewport(0, 0, width, height); 

    // Set the aspect ratio of the clipping volume to match the viewport 
    glMatrixMode(GL_PROJECTION); // To operate on the Projection matrix 
    glLoadIdentity();    // Reset 
    // Enable perspective projection with fovy, aspect, zNear and zFar 
    gluPerspective(45.0f, aspect, 0.1f, 100.0f); 
} 
void changeViewPort(int w, int h) 
{ 
    glViewport(0, 0, w, h); 
} 

void render() 
{ 
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
    glutSwapBuffers(); 
} 
int main(int argc, char* argv[]) { 

    void display(); 

    glutInit(&argc, argv);   // Initialize GLUT 
    glutInitDisplayMode(GLUT_DOUBLE); // Enable double buffered mode 
    glutInitWindowSize(640, 480); // Set the window's initial width & height 
    glutInitWindowPosition(50, 50); // Position the window's initial top-left corner 
    glutCreateWindow(title);   // Create window with the given title 
    glutDisplayFunc(display);  // Register callback handler for window re-paint event 
    glutReshapeFunc(reshape);  // Register callback handler for window re-size event 
    initGL();      // Our own OpenGL initialization 
    glutMainLoop();  

    return 0; 
} 

我的問題是，在錯誤的位置顯示的點。這是不可能的列[0]（等於1,2,3）都相同points.Can有人能幫我解決這個

Answer 1

https://rocketgit.com/user/bowler17/gl/source/tree/branch/wrench/blob/t.c

線之前大do while

Answer 2

setlocale(LC_NUMERIC, "C"); 

。