Sphere .. Open Gl

#include <glut.h>
#include <stdio.h>
#include <math.h>

GLfloat angle = 0.0; //angle for cube1
GLfloat tangle = 0.0; //angle for cube2

//-------------------------------------------------------------------

void DrawSphere (void) {
glPushMatrix(); //set where to start the current object
glTranslatef(1.5, 1.5, 0); //move cube2 to the left
glRotatef(tangle, 0.0, 1.0, 0.0);
glRotatef(tangle, 1.0, 0.0, 0.0);
glRotatef(tangle, 0.0, 0.0, 1.0);
glColor3f(0.0, 1.0, 0.0); //change cube2 to green
glutWireSphere(0.5,16,16);

glPopMatrix(); //end the current object transformations
}
//-------------------------------------------------------------------


//-------------------------------------------------------------------
void myDisplay(void)
{
 glMatrixMode(GL_MODELVIEW);
glClear(GL_COLOR_BUFFER_BIT);
glLoadIdentity();


DrawSphere();
glFlush();
glutSwapBuffers();
angle+= 0.5;
tangle+= 1.0;

}

/*void myMouse(int button, int state, int x, int y)
{
  if ( button == GLUT_LEFT_BUTTON && state == GLUT_DOWN)
    glutIdleFunc(myDisplay); // starts animation
  else if ( button == GLUT_RIGHT_BUTTON && state == GLUT_DOWN)
    glutIdleFunc(NULL); // stops animation
}*/
void myKeyboard(unsigned char key, int x, int y)
{
if (key=='r')
 glutIdleFunc(myDisplay);
if (key=='s')
 glutIdleFunc(NULL);
}



void myInit(void)
{
  glClearColor(0.0, 0.0, 0.0, 0.0); // set the background to black
  glColor3f(1.0f, 1.0f, 1.0f);      // set the drawing color to white
 
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluOrtho2D(0.0, 3.0, 0.0, 3.0);
}

//-------------------------------------------------------------------
void main( int argc, char **argv)
{
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB );
  glutInitWindowSize(550,450);
  glutInitWindowPosition(0,0);
  glutCreateWindow("One Triangle");
  //glutMouseFunc(myMouse);
  glutDisplayFunc(myDisplay);
  glutKeyboardFunc(myKeyboard);

  myInit();
 
  glutMainLoop();
}