import javax.swing.JPanel;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
import javax.swing.*;

/**
 * <p>Title: Data Dictionary Architect</p>
 * <p>Description: All of data elements to be documented and data links to be established between business areas.</p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: NASA</p>
 * @author Aaron Wilson
 * @version 1.0
 */

public class OrbitPanel
	extends JPanel
	implements Runnable, MouseListener {
	int eX, eY, sX, sY;
	int radinpix = 36, sRad=5;
	int gsradinpix = (int)(radinpix*6.6107);
	double X=6600, Y=0, VV = 0, VX = 0, VY = 7.9;
	double theta = 90., hc, vc;
	double DltT = 25.;
	double radinkms = 6378.15; // radius of Earth (in kms)35,786km
//	int radinpix = 160; // radius of Earth (in kms)    
	long rate;
	long lastUpdate;
	private boolean running = true;

  public OrbitPanel(long rate_ms) {
    rate = rate_ms;
    setBorder(new EtchedBorder(EtchedBorder.LOWERED));
    addMouseListener(this);
    eX = 400;
    eY = 330;
    sX = 300;
    sY = 300;
    sRad = 5;

    this.setFocusable(true);
    this.grabFocus();
  }

	public void goUp() {
		VX+=.003*Math.cos(theta)*DltT;
		VY+=.003*Math.sin(theta)*DltT;
	   	}
	public void goDown() {
//		theta+=Math.PI;
	}
	public void goLeft() {
		theta-=.1;
	}
	public void goRight() {
		theta+=.1;
	}

  	public void paint(Graphics g) {
	    super.paint(g);
	    Graphics2D g2 = (Graphics2D) g;
   
	    g2.setColor(Color.blue);
	    g2.fillOval(eX-radinpix, eY-radinpix, radinpix << 1, radinpix << 1);

	    g2.setColor(Color.lightGray);
	    g2.drawOval(eX-gsradinpix, eY-gsradinpix, gsradinpix << 1, gsradinpix << 1);
	    
		calculateOrbit();
		
	    g2.setColor(Color.red);
	    g2.fillOval(sX-1, sY-1, 2, 2);  
	    g2.setColor(Color.blue);
		
	    hc = Math.cos(theta);
		vc = Math.sin(theta);	    
 		g2.drawLine((int)(sX+(-1*hc-vc/2)*sRad),(int)(sY+(-1*vc+hc/2)*sRad),
 			(int)(sX+1*hc*sRad),(int)(sY+1*vc*sRad));
		g2.drawLine((int)(sX+(-1*hc+vc/2)*sRad),(int)(sY+(-1*vc-hc/2)*sRad),
			(int)(sX+1*hc*sRad),(int)(sY+1*vc*sRad)); 	
  }

	private void calculateOrbit() {
		double t, rad;
		double g1X, g1Y;
		double VYavg = 0,VXavg = 0,VX1 = 0,VY1 = 0;
//		double Y = -radinkms*1.05,X = 0;
		double grav, grav0 = .0098;

		rad = Math.sqrt(Math.pow(X,2) + Math.pow(Y,2));
		grav = grav0 * (6378.15/rad) * (6378.15/rad);
//		t = t + DltT;
		g1X = -(X/rad) * grav;
		g1Y = -(Y/rad) * grav;
		VX1 = VX + DltT*g1X;
		VY1 = VY + DltT*g1Y;
		X = X + DltT * (VX + VX1) / 2 ;
		Y = Y + DltT * (VY + VY1) / 2 ;
		//      drawOrbit(x,z,Vx1,Vz1);
		VX = VX1;
		VY = VY1;
		VV = Math.sqrt(Math.pow(VX,2) + Math.pow(VY,2));
		sX = eX + (int)(radinpix*X/radinkms);
    	sY = eY + (int)(radinpix*Y/radinkms);
//		System.out.println(sX+" "+sY+" "+X+" "+Y+" "+VX+" "+VY+" "+gX+" "+gY);
	}

  /**
   * run
   */
  public void run() {
    long ct;
    while (running) {
      ct = System.currentTimeMillis();
      if ( (ct - lastUpdate) >= rate) {
        //calculateOrbit();
        repaint();
        lastUpdate = System.currentTimeMillis();
      }
      else {
        try {
          Thread.sleep(rate >> 1);
        }
        catch (InterruptedException ex) {
        }
      }
    }
  }

  /**
   * keyPressed
   *
   * @param e KeyEvent
   */
  public void keyPressed(KeyEvent e) {
  }

  /**
   * keyReleased
   *
   * @param e KeyEvent
   */
  public void keyReleased(KeyEvent e) {
  }

  /**
   * keyTyped
   *
   * @param e KeyEvent
   */
  public void keyTyped(KeyEvent e) {
    System.out.println("Key typed: " + e.getKeyChar());
  }

  /**
   * mouseClicked
   *
   * @param e MouseEvent
   */
  public void mouseClicked(MouseEvent e) {
	  
    System.out.println("MouseClicked");
  }

  /**
   * mouseEntered
   *
   * @param e MouseEvent
   */
  public void mouseEntered(MouseEvent e) {
  }

  /**
   * mouseExited
   *
   * @param e MouseEvent
   */
  public void mouseExited(MouseEvent e) {
  }

  /**
   * mousePressed
   *
   * @param e MouseEvent
   */
  public void mousePressed(MouseEvent e) {
  }

  /**
   * mouseReleased
   *
   * @param e MouseEvent
   */
  public void mouseReleased(MouseEvent e) {
  }

}