For Egor with ♥

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

void draw_shape(float x0, float y0, float R, float R2) {
    float x[8], y[8], N = 8;
    float x2[40], y2[40], N2 = 40;

    for (int i = 0; i < N; i++) {
        x[i] = R * cosf(2 * 3.14159 * i / N) + x0;
        y[i] = R * sinf(2 * 3.14159 * i / N) + y0;
    }

    glBegin(GL_LINES);
    for (int i = 0; i < N; i++) {
        if (i == 6) {
            glVertex2i(x[i], y[i]);
            glVertex2i(x[0], y[0]);
        }
        else if (i == 7) {
            glVertex2i(x[i], y[i]);
            glVertex2i(x[1], y[1]);
        }
        else {
            glVertex2i(x[i], y[i]);
            glVertex2i(x[i + 2], y[i + 2]);
        }
    }
    glEnd();


    for (int i = 0; i < N2; i++) {
        x2[i] = R2 * cosf(2 * 3.14159 * i / N2) + x0;
        y2[i] = R2 * sinf(2 * 3.14159 * i / N2) + y0;
    }

    glBegin(GL_LINES);
    for (int i = 0; i < N2; i++) {
        if (i == 39) {
            glVertex2i(x2[i], y2[i]);
            glVertex2i(x2[0], y2[0]);
        }
        else {
            glVertex2i(x2[i], y2[i]);
            glVertex2i(x2[i + 1], y2[i + 1]);
        }
    }
    glEnd();


    glFlush();

}

void display() {
    glClear(GL_COLOR_BUFFER_BIT);

    draw_shape(320, 240, 100, 50);
}

//void reshape(int width, int height) {
//  glClear(GL_COLOR_BUFFER_BIT);
//
//  float x = width / 2.0;
//  float y = height / 2.0;
//
//  draw_shape(x, y, 100, 50);
//}

int main(int argc, char** argv) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
    glutInitWindowSize(640, 480);
    glutInitWindowPosition(10, 10);
    glutCreateWindow("LAB 1");
    glClearColor(1.0, 1.0, 1.0, 0.0);
    glColor3f(0.0,0.0,0.0);
    glPointSize(4.0);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0, 640.0, 0, 480.0);
    glutDisplayFunc(display);
    //glutReshapeFunc(reshape);
    glutMainLoop();
    return 0;
}