edem中颗粒生成后导出颗粒位置信息ID号，获取颗粒团形貌的c++代码

以下是一个简单的 C++ 代码示例，用于从 edem 中导出颗粒位置信息 ID 号和颗粒坐标，并计算颗粒团的形貌统计数据：

#include <iostream>
#include <fstream>
#include <vector>
#include <cmath>

using namespace std;

struct Particle{
    int id;
    double x, y, z;
};

int main(){
    // Open the edem output file
    ifstream infile("edem_output.txt");

    // Read the number of particles
    int numParticles;
    infile >> numParticles;

    // Read the particle data
    vector<Particle> particles(numParticles);
    for(int i = 0; i < numParticles; i++){
        infile >> particles[i].id >> particles[i].x >> particles[i].y >> particles[i].z;
    }

    // Close the file
    infile.close();

    // Calculate the center of mass
    double cx = 0.0, cy = 0.0, cz = 0.0;
    for(int i = 0; i < numParticles; i++){
        cx += particles[i].x;
        cy += particles[i].y;
        cz += particles[i].z;
    }
    cx /= numParticles;
    cy /= numParticles;
    cz /= numParticles;

    // Calculate the moments of inertia
    double Ixx = 0.0, Iyy = 0.0, Izz = 0.0, Ixy = 0.0, Ixz = 0.0, Iyz = 0.0;
    for(int i = 0; i < numParticles; i++){
        Ixx += (particles[i].y - cy) * (particles[i].y - cy) + (particles[i].z - cz) * (particles[i].z - cz);
        Iyy += (particles[i].x - cx) * (particles[i].x - cx) + (particles[i].z - cz) * (particles[i].z - cz);
        Izz += (particles[i].x - cx) * (particles[i].x - cx) + (particles[i].y - cy) * (particles[i].y - cy);
        Ixy -= (particles[i].x - cx) * (particles[i].y - cy);
        Ixz -= (particles[i].x - cx) * (particles[i].z - cz);
        Iyz -= (particles[i].y - cy) * (particles[i].z - cz);
    }
    Ixy /= numParticles;
    Ixz /= numParticles;
    Iyz /= numParticles;

    // Calculate the principal moments of inertia
    double a = 1.0, b = Ixx + Iyy + Izz, c = Ixx * Iyy + Ixx * Izz + Iyy * Izz - Ixy * Ixy - Ixz * Ixz - Iyz * Iyz;
    double delta = b * b - 4.0 * a * c;
    double I1 = (-b + sqrt(delta)) / (2.0 * a);
    double I2 = (-b - sqrt(delta)) / (2.0 * a);
    double I3 = Izz;

    // Calculate the radius of gyration
    double Rg = sqrt((Ixx + Iyy + Izz) / numParticles);

    // Print the results
    cout << "Center of mass: (" << cx << ", " << cy << ", " << cz << ")" << endl;
    cout << "Principal moments of inertia: " << I1 << ", " << I2 << ", " << I3 << endl;
    cout << "Radius of gyration: " << Rg << endl;

    return 0;
}

在这个示例代码中，我们首先从 edem 输出文件中读取颗粒数量和颗粒位置信息，然后计算颗粒团的质心坐标和惯性矩，并使用它们计算颗粒团的形貌统计数据，例如主惯性矩和半径的旋转。这个示例代码只是一个简单的实现，需要根据具体情况进行修改和扩展。