/**********************************/
/* Rotating teapot                */
/* framework for the second lab   */
/* press + - to rotate            */
/* (C) Bedrich Benes 2004         */
/* bbenes<at>purdue.edu           */
/**********************************/

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

GLfloat angle;


void Reshape(int w, int h)
{
  glViewport(0, 0, w, h);       
  glMatrixMode(GL_PROJECTION);  
  glLoadIdentity();             
  glOrtho(-1, 1, -1, 1, -10, 10);
}

void Display(void)
{
  glClear(GL_COLOR_BUFFER_BIT);
  glColor3f(1,1,1);
  glLoadIdentity();
  glRotatef(angle,0,1,0);
  glutWireTeapot(0.6);
  glutSwapBuffers();  
}

void Kbd(unsigned char a, int x, int y)
{
	switch(a)
	{
	case '+' : angle-=1;break;
	case '-' : angle+=1;break;
	case 'q': case 'Q': case 27: exit(0);
	}
	glutPostRedisplay();
}

int main(int argc, char **argv)
{
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA);
  glutInitWindowPosition(200,200);
  glutInitWindowSize(500,500);
  glutCreateWindow("Rotating teapot");
  glutDisplayFunc(Display);
  glutReshapeFunc(Reshape);
  glutKeyboardFunc(Kbd);
  glutMainLoop();
  return 0;        
}