opengl 绘制3D 坐标 图表 代码

下面是一个使用OpenGL绘制三维散点图的示例代码，其中包括了上述步骤的实现。

#include <GL/glut.h>
#include <math.h>

typedef struct {
    float x, y, z;
    float r, g, b;
} Point3D;

Point3D points[] = {
    {0.5, 0.5, 0.5, 1.0, 0.0, 0.0},
    {0.5, -0.5, 0.5, 1.0, 1.0, 0.0},
    {-0.5, -0.5, 0.5, 0.0, 1.0, 0.0},
    {-0.5, 0.5, 0.5, 0.0, 0.0, 1.0},
    {0.5, 0.5, -0.5, 1.0, 0.0, 1.0},
    {0.5, -0.5, -0.5, 1.0, 1.0, 1.0},
    {-0.5, -0.5, -0.5, 0.0, 1.0, 1.0},
    {-0.5, 0.5, -0.5, 0.5, 0.5, 0.5}
};

void init(void)
{
    glClearColor(0.0, 0.0, 0.0, 0.0);
    glShadeModel(GL_SMOOTH);
}

void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    // 绘制坐标轴
    glBegin(GL_LINES);
    glColor3f(1.0, 0.0, 0.0);
    glVertex3f(0.0, 0.0, 0.0);
    glVertex3f(1.0, 0.0, 0.0);
    glColor3f(0.0, 1.0, 0.0);
    glVertex3f(0.0, 0.0, 0.0);
    glVertex3f(0.0, 1.0, 0.0);
    glColor3f(0.0, 0.0, 1.0);
    glVertex3f(0.0, 0.0, 0.0);
    glVertex3f(0.0, 0.0, 1.0);
    glEnd();

    // 绘制散点
    glPointSize(5.0);
    glBegin(GL_POINTS);
    for (int i = 0; i < sizeof(points) / sizeof(points[0]); i++) {
        glColor3f(points[i].r, points[i].g, points[i].b);
        glVertex3f(points[i].x, points[i].y, points[i].z);
    }
    glEnd();

    glFlush();
}

void reshape(int w, int h)
{
    glViewport(0, 0, (GLsizei)w, (GLsizei)h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60.0, (GLfloat)w / (GLfloat)h, 0.1, 100.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
}

int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
    glutInitWindowSize(500, 500);
    glutInitWindowPosition(100, 100);
    glutCreateWindow("3D Scatter Plot");
    init();
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutMainLoop();
    return 0;
}

注意：需要链接OpenGL和glut库才能编译通过。