import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.media.opengl.GL;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLCanvas;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.GLJPanel;
import javax.media.opengl.glu.GLU;
import javax.swing.JFrame;
import java.lang.Math;

import com.sun.opengl.util.GLUT;

public class SolarSystem //
    extends glskeleton//
    implements GLEventListener//
	       , KeyListener //
{
    private GLU glu;
    private GLUT glut;
    private double year = 0;
    private double month = 0;
    
    public SolarSystem() {
    }
    
    public static void main(String[] args) {
        GLCapabilities caps = new GLCapabilities();
        GLJPanel canvas = new GLJPanel(caps);
        SolarSystem demo = new SolarSystem();
        canvas.addGLEventListener(demo);
        demo.setCanvas(canvas);
        demo.setDefaultListeners(demo);
        JFrame frame = new JFrame("SolarSystem");
        frame.setSize(800, 800);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(canvas);
        frame.setVisible(true);
        canvas.requestFocusInWindow();
    }
    
    public void init(GLAutoDrawable drawable) {
        GL gl = drawable.getGL();
        glu = new GLU();
        glut = new GLUT();
        gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
        gl.glShadeModel(GL.GL_FLAT);
    }
    
    public void display(GLAutoDrawable drawable) {
        GL gl = drawable.getGL();
	gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
	gl.glMatrixMode(GL.GL_MODELVIEW);
	gl.glLoadIdentity();
	gl.glColor3f (1.0f, 0.0f, 0.0f);
	glut.glutWireSphere(1.0, 50, 50);        /* draw sun */
	gl.glLoadIdentity();
	gl.glRotated(this.year, 0.0, 1.0, 0.0);
	gl.glTranslatef (2.0f, 0.0f, 0.0f);
	gl.glColor3f(0.0f,0.0f,1.0f);
	glut.glutWireSphere(0.2, 20, 20);        /* draw earth */
	gl.glLoadIdentity();
	gl.glTranslatef((float)(2.0*Math.cos(this.year*2*Math.PI/360)),0.0f, (float)(2.0*Math.sin(-this.year*2*Math.PI/360)));
	gl.glRotatef((float)month, 0.0f, 1.0f, 0.0f);
	gl.glTranslatef((float)(-2.0*Math.cos(this.year*2*Math.PI/360)),0.0f,(float)(-2.0*Math.sin(-this.year*2*Math.PI/360)));
	gl.glRotatef((float)year, 0.0f, 1.0f, 0.0f);
	gl.glTranslatef(2.5f, 0.0f, 0.0f);
	gl.glColor3f(0.0f,1.0f,0.0f);
	glut.glutWireSphere(0.1, 10, 10);        /* draw moon */
	gl.glFlush();
    }
    
    public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h) {
        GL gl = drawable.getGL();
	gl.glViewport(0, 0, w, h);
	gl.glMatrixMode(GL.GL_PROJECTION);
	gl.glLoadIdentity();
	glu.gluPerspective(90.0, (float)w/(float)h, 1.0, 40.0);
	//Change the parameters to see the result
	glu.gluLookAt(0,0,5, 
		      0,0,0, 
		      0,1,0);
    }
    
    public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
			       boolean deviceChanged) {
    }
    
    public void keyTyped(KeyEvent arg0) {
    }
    
    public void keyPressed(KeyEvent key) {
        switch (key.getKeyCode()) {
	case KeyEvent.VK_ESCAPE:
	    super.runExit();
	case KeyEvent.VK_A:
	    this.year += 5;
	    this.month +=15;
	    break;
	case KeyEvent.VK_D:
	    this.year -= 5;
	    this.month -= 15;
	default:
	    break;
        }
        super.refresh();
    }
    
    public void keyReleased(KeyEvent arg0) {
    }
    
}