#include <glut.h>
#include <cmath>

const double pi = 3.1415926535897932384626433832795;
const double r1 = 0.25;
const double r2 = 0.5;
const double base1 = -pi / 2;
const double base2 = pi / 2;

void Draw(){
	glClear( GL_COLOR_BUFFER_BIT);
	glBegin(GL_POLYGON);
	glColor3d(1, 1, 0);

	for(int i = 0; i < 5; i++){
		double a1, a2;
		a1 = base1 + i * 2 * pi / 5;
		a2 = base2 + (i+3) * 2 * pi / 5;
		glVertex2d( r1 * cos(a1), r1 * sin(a1) );
		glVertex2d( r2 * cos(a2), r2 * sin(a2) );


	}

	glEnd();
	glFlush();
}

int main(int argc, char ** argv){
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE);
	glutInitWindowPosition(100, 100);
	glutInitWindowSize(500, 500);
	glutCreateWindow( " hello " );
	glutDisplayFunc( Draw );
	//glEnable(GL_CLIP_PLANE0);
	//double eq[] = {-1.8, -1.0, 0.0, 1.4};
	//glClipPlane(GL_CLIP_PLANE0, eq );

	//glEnable(GL_CLIP_PLANE1);
	//double eq1[] = {0.5, -0.9, 0.0, 0.2};
	//glClipPlane(GL_CLIP_PLANE1, eq1);

	glutMainLoop();

	return 0;
}