#include <windows.h>
#include <gl/Gl.h>
#include <gl/Glu.h>
#include <gl/glut.h>
#include <iostream>
#include <math.h>

using namespace std;

// demo program to draw a rosette based on a 5-gon 


class GLintPoint
{
public:
	GLint x, y; 
};


// point 2 class
class Point2
{
public:
	float x, y;
	void set (float dx, float dy){x = dx; y = dy;}
	void set(Point2& p) {x = p.x; y = p.y;}
	Point2(float xx, float yy){x=xx; y=yy;}
	Point2(){x=y=0;}
};

Point2 currPos;
Point2 CP;

void moveTo(Point2 p)
{
	CP.set(p);
}

void lineTo(Point2 p)
{
	glBegin(GL_LINES);
		glVertex2f(CP.x, CP.y);
		glVertex2f(p.x, p.y);
	glEnd();
	glFlush();
	CP.set(p);
}


void myInit(void)
{
	glClear(GL_COLOR_BUFFER_BIT);
	glClearColor( 1.0, 0.0, 0.0, 0.0 );
	// background is red
	glColor3f( 0.0, 0.0, 1.0 ); 
	// drawing color is blue
}

	
void rosette(int N, float radius)
{
	Point2 * pointlist = new Point2[ N ];
	GLfloat theta = ( 2.0f * 3.1415926536 ) / N;
	
	for( int c = 0; c < N; c++ )
	{	
		pointlist[c].set( radius * sin( theta * c ), radius * cos( theta * c ) );
			}
	for( int i = 0; i < N; i++ ) 
	{
		for( int j = 0; j < N; j++ ) 
		{
			moveTo(pointlist[i]);
			lineTo(pointlist[j]);
		}
	}
}

void render() 
{
	//this is the callback for displays
	glClear(GL_COLOR_BUFFER_BIT);
	glViewport( 10, 10, 640, 480 );
	rosette(5, .66f);
	glFlush();
}


void main(int argc, char** argv) {
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glutInitWindowSize (640,480);
	glutCreateWindow("Rosette");
	glutDisplayFunc( render );// register the callback for the display function
	myInit();
	glutMainLoop();	
}