/*
 * robot.java
 * This program shows how to composite modeling transformations
 * to draw translated and rotated hierarchical models.
 * Interaction:  pressing the s and e keys (shoulder and elbow)
 * alters the rotation of the robot arm.
 */

import jgl.GL;
import jgl.GLApplet;

public class robot extends GLApplet {

    private static int shoulder = 0, elbow = 0;

    private void myinit () {
    	myGL.glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
	myGL.glShadeModel (GL.GL_FLAT);
    }

    public void display () {
	myGL.glClear (GL.GL_COLOR_BUFFER_BIT);
	myGL.glPushMatrix ();
	    myGL.glTranslatef (-1.0f, 0.0f, 0.0f);
	    myGL.glRotatef ((float)shoulder, 0.0f, 0.0f, 1.0f);
	    myGL.glTranslatef (1.0f, 0.0f, 0.0f);
	    myGL.glPushMatrix ();
		myGL.glScalef (2.0f, 0.4f, 1.0f);
		myUT.glutWireCube (1.0);
	    myGL.glPopMatrix ();

	    myGL.glTranslatef (1.0f, 0.0f, 0.0f);
	    myGL.glRotatef ((float)elbow, 0.0f, 0.0f, 1.0f);
	    myGL.glTranslatef (1.0f, 0.0f, 0.0f);
	    myGL.glPushMatrix ();
		myGL.glScalef (2.0f, 0.4f, 1.0f);
		myUT.glutWireCube (1.0);
	    myGL.glPopMatrix ();

	myGL.glPopMatrix ();
	myGL.glFlush ();
    }

    public void myReshape (int w, int h) {
	myGL.glViewport (0, 0, w, h);
	myGL.glMatrixMode (GL.GL_PROJECTION);
	myGL.glLoadIdentity ();
	myGLU.gluPerspective (60.0, (double)w/(double)h, 1.0, 20.0);
	myGL.glMatrixMode (GL.GL_MODELVIEW);
	myGL.glLoadIdentity ();
	myGL.glTranslatef (0.0f, 0.0f, -5.0f);
    }

    /* ARGSUSED1 */
    public void keyboard (char key, int x, int y) {
	switch (key) {
	    case 's':
		shoulder = (shoulder + 5) % 360;
		myUT.glutPostRedisplay ();
		break;
	    case 'S':
		shoulder = (shoulder - 5) % 360;
		myUT.glutPostRedisplay ();
		break;
	    case 'e':
		elbow = (elbow + 5) % 360;
		myUT.glutPostRedisplay ();
		break;
	    case 'E':
		elbow = (elbow - 5) % 360;
		myUT.glutPostRedisplay ();
		break;
	    default:
		break;
	}
    }

    public void init () {
	myUT.glutInitWindowSize (400, 400);
	myUT.glutInitWindowPosition (0, 0);
	myUT.glutCreateWindow (this);
	myinit ();
	myUT.glutDisplayFunc ("display");
	myUT.glutReshapeFunc ("myReshape");
	myUT.glutKeyboardFunc ("keyboard");
	myUT.glutMainLoop ();
    }

}