#include <GL/freeglut.h>
#include <math.h>
#include <time.h>
#include <stdio.h>

float const pi = 3.14159;
int Mx = 0, My = 0;


class Moon
{
public:
	float r;
	float x, y;
	float dist;
	float theta;
	Moon() {
		theta = rand();
	}

	void setVar(float tr,float tdist, float tx, float ty) {
		r = tr;
		x = tx;
		y = ty;
		dist = tdist;
	}

	void update() {
		theta -= 0.005;
	}

	void display() {
		int n = 360;

		float lx = (dist * cos(theta));
		float ly = (dist * sin(theta));
		float theta2;
		glColor3f(1.0, 0.8, 0.3);
		glBegin(GL_POLYGON);
		for (int j = 0; j < 360; j++) {
			theta2 = (pi * 2.0)*j / n;
			glVertex2f(x + lx + (r * cos(theta2)), (y + ly + (r * sin(theta2))));
		}
		glEnd();
		glColor3f(0.0, 0.0, 0.0);
		glBegin(GL_LINE_LOOP);
		for (int j = 0; j < 360; j++) {
			theta2 = (pi * 2.0)*j / n;
			glVertex2f(x + lx + (r * cos(theta2)), (y + ly + (r * sin(theta2))));
		}
		glEnd();
	}

};


class Planet
{
	public:
		float r;
		float dist;
		float theta;
		//float distEtoM = rand()%10+15;
		Moon moon;
		Planet(float tr,float tdist) {
			r = tr;
			dist = tdist;
			theta = rand();
		}

		void update() {
			theta += 0.001;
		}

		void display() {
			int n = 360;

			//theta = rand();
			float lx = (dist * cos(theta));
			float ly = (dist * sin(theta));
			moon.setVar(r / 3, r + 20, lx, ly);
			float theta2;
			glColor3f(1.0, 0.8, 0.3);
			glBegin(GL_POLYGON);
			for (int j = 0; j < 360; j++) {
				theta2 = (pi * 2.0)*j / n;
				glVertex2f(lx + (r * cos(theta2)), (ly + (r * sin(theta2))));
			}
			glEnd();
			moon.display();
			moon.update();
			glColor3f(0.0, 0.0, 0.0);
			glBegin(GL_LINE_LOOP);
			for (int j = 0; j < 360; j++) {
			theta2 = (pi * 2.0)*j / n;
			glVertex2f(lx + (r * cos(theta2)), (ly + (r * sin(theta2))));
			}
			glEnd();
		}

};

void init(void)
{
	glClearColor(0.8, 0.8, 0.8, 1.0);
	gluOrtho2D(-500, 500.0, -500.0, 500.0);
}


Planet a1(20, 160);
Planet a2(15, 200);
Planet a3(25, 250);
Planet a4(30, 310);
Planet a5(20, 370);
Planet a6(50, 430);
//Planet a7(20, 180);
//Planet a8(20, 180);

void display()
{
	srand(time(0));
	glClear(GL_COLOR_BUFFER_BIT);
	int x = 0;
	int y = 0;
	glColor3f(0.3, 0.2, 0.1);
	glBegin(GL_POLYGON);
	for (int i = 0; i < 360; i++) {
		float theta = (pi * 2.0)*i / 360;
		glVertex2f((100 * cos(theta)), ((100 * sin(theta))));
	}
	glEnd();
	glColor3f(0.0, 0.0, 0.0);
	glBegin(GL_LINE_LOOP);
	for (int i = 0; i < 360; i++) {
		float theta = (pi * 2.0)*i / 360;
		glVertex2f((100 * cos(theta)), ((100 * sin(theta))));
	}
	glEnd();

	a1.display();
	a1.update();
	a2.display();
	a2.update();
	a3.display();
	a3.update();
	a4.display();
	a4.update();
	a5.display();
	a5.update();
	a6.display();
	a6.update();

	glutPostRedisplay();
	//
	glFlush();
}

int main(int argc, char** argv)
{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_RGBA);
	glutInitWindowSize(800, 800);
	glutInitWindowPosition(100, 100);
	glutCreateWindow("Test OpenGL");
	glutDisplayFunc(display);
	glutKeyboardFunc(keyboard);
	init();
	glutMainLoop();
	return 0;
}