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

double height = 600;
double width = 600;
const double DEG2RAD = 3.14159265/180;

void drawCircle2(double x, double y,double r)
{
   glBegin(GL_POLYGON);

   for (int i=0; i < 360; i++)
   {
      double deg = i*DEG2RAD;
      glVertex2d(cos(deg)*r+x,sin(deg)*r+y);
   }

   glEnd();
}
/*
void drawCircle(double x, double y, double r) {
	double xx1,yy1;
    glBegin(GL_LINES);
    for (double i = 0; i < 180; i+=2*eps)
    {
    xx1 = r * cos((double)i) + x;
    yy1 = r * sin((double)i) + y;
    glVertex3d(xx1,yy1,0);

    xx1= r * cos(i + eps) + x;
    yy1 = r * sin(i + eps) + y;
    glVertex3d(xx1,yy1,0);
    }
    glEnd();
}
*/
void Draw() {
	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(1.0, 1.0, 1.0);

	glEnable(GL_LINE_SMOOTH);
	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
	glHint(GL_LINE_SMOOTH_HINT,GL_NICEST);


	drawCircle2(200,200,100);
	glBegin(GL_LINES);
		glVertex2d(0, 0);
		glVertex2d(600, 300);
	glEnd();
	glFlush();
}

void Initialize() {
	glClearColor(0.0, 0.0, 0.0, 0.0);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(0.0, width, 0.0, height, -1.0, 1.0);
}

int main(int iArgc, char** cppArgv) {
	glutInit(&iArgc, cppArgv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	glutInitWindowSize(width, height);
	glutInitWindowPosition(200, 200);
	glutCreateWindow("Example");
	Initialize();
	glutDisplayFunc(Draw);
	glutMainLoop();
	return 0;
}