/********************************************************************
  File: curve.cc 
  Draws a circle as a line strip.
  D. Vrajitoru.
********************************************************************/

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

int n;

// display a curve as a line strip
void circle()
{
  glBegin(GL_LINE_STRIP);
  for (int i=0; i<=100; i++) 
    glVertex2f(cos((M_PI*i)/50), sin((M_PI*i)/50));
  glEnd();
}

void display(void)
{
  glClear(GL_COLOR_BUFFER_BIT);
  circle();
  glFlush();
}

void myinit()
{
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluOrtho2D(-1.25, 1.25, -1.25, 1.25);
  glMatrixMode(GL_MODELVIEW);
  glClearColor (1.0, 0.95, 0.9, 1.0);
  glColor3f(1.0,0.0,0.0);
}

int main(int argc, char **argv)
{
  n=4;
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB );
  glutInitWindowSize(300, 300);
  glutCreateWindow("circle");
  glutDisplayFunc(display);
  myinit();
  glutMainLoop();
}