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

static int shoulder = 0, elbow = 0,thumb=0,littlethumb=0;

void init(void)
{
   glClearColor (0.0, 0.0, 0.0, 0.0);
   glShadeModel (GL_FLAT);
}

void display(void)
{
   glClear (GL_COLOR_BUFFER_BIT);
   glPushMatrix();
   glTranslatef (-1.0, 0.0, 0.0);
   glRotatef ((GLfloat) shoulder, 0.0, 0.0, 1.0);
   glTranslatef (1.0, 0.0, 0.0);
   glPushMatrix();
   glScalef (2.0, 0.4, 1.0);
   glutWireCube (1.0);
   glPopMatrix();

   glTranslatef (1.0, 0.0, 0.0);
   glRotatef ((GLfloat) elbow, 0.0, 0.0, 1.0);
   glTranslatef (1.0, 0.0, 0.0);
   glPushMatrix();
   glScalef (2.0, 0.4, 1.0);
   glutWireCube (1.0);
   glPopMatrix();
  
   glPushMatrix();
   glTranslatef(0.0,0.2,0.5);
   glTranslatef(1.0,0.0,0.0);
   glRotatef((GLfloat)thumb,0.0,0.0,1.0);
   glTranslatef(0.3,0.0,0.0);
   glPushMatrix();
   glScalef(0.6,0.1,0.2);
   glutWireCube(1);
   glPopMatrix();
   glTranslatef(0.3,0.0,0.0);
   glRotatef((GLfloat)littlethumb,0.0,0.0,1.0);
   glTranslatef(0.2,0.0,0.0);
   glPushMatrix();
   glScalef(0.4,0.1,0.1);
   glutWireCube(1);
   glPopMatrix();
   glPopMatrix();

   glPushMatrix();
   glTranslatef(0.0,0.2,-0.5);
   glTranslatef(1.0,0.0,0.0);
   glRotatef((GLfloat)thumb,0.0,0.0,1.0);
   glTranslatef(0.3,0.0,0.0);
   glPushMatrix();
   glScalef(0.6,0.1,0.2);
   glutWireCube(1);
   glPopMatrix();
   glTranslatef(0.3,0.0,0.0);
   glRotatef((GLfloat)littlethumb,0.0,0.0,1.0);
   glTranslatef(0.2,0.0,0.0);
   glPushMatrix();
   glScalef(0.4,0.1,0.1);
   glutWireCube(1);
   glPopMatrix();
   glPopMatrix();

   glPushMatrix();
   glTranslatef(0.0,0.2, 0.2);
   glTranslatef(1.0,0.0,0.0);
   glRotatef((GLfloat)thumb,0.0,0.0,1.0);
   glTranslatef(0.3,0.0,0.0);
   glPushMatrix();
   glScalef(0.6,0.1,0.2);
   glutWireCube(1);
   glPopMatrix();
   glTranslatef(0.3,0.0,0.0);
   glRotatef((GLfloat)littlethumb,0.0,0.0,1.0);
   glTranslatef(0.2,0.0,0.0);
   glPushMatrix();
   glScalef(0.4,0.1,0.1);
   glutWireCube(1);
   glPopMatrix();
   glPopMatrix();

   glPushMatrix();
   glTranslatef(0.0,0.2,-0.2);
   glTranslatef(1.0,0.0,0.0);
   glRotatef((GLfloat)thumb,0.0,0.0,1.0);
   glTranslatef(0.3,0.0,0.0);
   glPushMatrix();
   glScalef(0.6,0.1,0.2);
   glutWireCube(1);
   glPopMatrix();
   glTranslatef(0.3,0.0,0.0);
   glRotatef((GLfloat)littlethumb,0.0,0.0,1.0);
   glTranslatef(0.2,0.0,0.0);
   glPushMatrix();
   glScalef(0.4,0.1,0.1);
   glutWireCube(1);
   glPopMatrix();
   glPopMatrix();

   glPushMatrix();
   glTranslatef(0.0,-0.2,-0.2);
   glTranslatef(1.0,0.0,0.0);
   glRotatef((GLfloat)thumb,0.0,0.0,1.0);
   glTranslatef(0.3,0.0,0.0);
   glPushMatrix();
   glScalef(0.6,0.1,0.2);
   glutWireCube(1);
   glPopMatrix();
   glTranslatef(0.3,0.0,0.0);
   glRotatef((GLfloat)littlethumb,0.0,0.0,1.0);
   glTranslatef(0.2,0.0,0.0);
   glPushMatrix();
   glScalef(0.4,0.1,0.1);
   glutWireCube(1);
   glPopMatrix();
   glPopMatrix();

   glPopMatrix();
   glutSwapBuffers();
}

void reshape (int w, int h)
{
   glViewport (0, 0, (GLsizei) w, (GLsizei) h);
   glMatrixMode (GL_PROJECTION);
   glLoadIdentity ();
   gluPerspective(65.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
   glTranslatef (0.0, 0.0, -5.0);
}

void keyboard (unsigned char key, int x, int y)
{
   switch (key) {
      case 's':
         shoulder = (shoulder + 5) % 360;
         glutPostRedisplay();
         break;
      case 'S':
         shoulder = (shoulder - 5) % 360;
         glutPostRedisplay();
         break;
      case 'e':
         elbow = (elbow + 5) % 360;
         glutPostRedisplay();
         break;
      case 'E':
         elbow = (elbow - 5) % 360;
         glutPostRedisplay();
         break;
   case 'd':
    thumb= (thumb+5)%360;
    glutPostRedisplay();
    break;
   case'D':
    thumb= (thumb-5)%360;
    glutPostRedisplay();
    break;
   case'l':
    littlethumb=(littlethumb-5)%360;
    glutPostRedisplay();
    break;
   case'L':
    littlethumb=(littlethumb+5)%360;
    glutPostRedisplay();
    break;
      case 27:
         exit(0);
         break;
      default:
         break;
   }
}

int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
   glutInitWindowSize (800, 500);
   glutInitWindowPosition (100, 100);
   glutCreateWindow (argv[0]);
   init ();
   glutDisplayFunc(display);
   glutReshapeFunc(reshape);
   glutKeyboardFunc(keyboard);
   glutMainLoop();
   return 0;
}