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

void drawCircle(float x, float y, float r, int amountSegments)
{
    glBegin(GL_TRIANGLE_FAN);
    for (int i = 0; i < amountSegments; i++)
    {
        float angle = 2.0 * 3.1415926 * float(i) / float(amountSegments);
        float dx = r * cosf(angle);
        float dy = r * sinf(angle);
        glVertex3f(x + dx, y + dy, 1);
    }
    glEnd();
}

void display()
{
    glClear(GL_COLOR_BUFFER_BIT);

    glColor3d(0.5, 0.5, 0.5);
    glBegin(GL_QUADS);
    glVertex3d(80, 300, 0);
    glVertex3d(100, 300, 0);
    glVertex3d(100, 90, 0);
    glVertex3d(80, 90, 0);

    glEnd();

    glColor3d(0.5, 0.5, 0.5);

    glBegin(GL_QUADS);
    glVertex3d(60, 90, 0);
    glVertex3d(120, 90, 0);
    glVertex3d(120, 20, 0);
    glVertex3d(60, 20, 0);

    glEnd();

    glColor3f(1.0, 0.0, 0.0);

    drawCircle(90, 32, 6, 30);


    glColor3f(1.0, 1.0, 0.0);

    drawCircle(90, 55, 6, 30);

    glColor3f(0.0, 1.0, 0.0);

    drawCircle(90, 78, 6, 30);



    glFlush();
}

int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(500, 500);
    glutInitWindowPosition(100, 200);
    glutCreateWindow("Лабораторная работа 6");
    glClearColor(1, 1, 1, 1); //set bg color
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0, 200, 200, 0);
    glutDisplayFunc(display);
    glutMainLoop();
}