Quellcode-Bibliothek Radar.java Sprache: JAVA

/**
* Copyright (C) 2011 Aarhus University
*
* This software is provided under the MIT-license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*
*
* @author Rasmus W. Lauritsen (rala@iha.dk, rwl@post.au.dk, rwl@cs.au.dk)
* @date 2011-12-28
*
*/
package dk.au.eng;

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Panel;
import java.util.HashMap;
import java.util.Map;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

import org.overture.interpreter.values.IntegerValue;
import org.overture.interpreter.values.NumericValue;
import org.overture.interpreter.values.SeqValue;
import org.overture.interpreter.values.Value;
import org.overture.interpreter.values.VoidValue;

public class Radar extends Panel {

private static final long serialVersionUID = 8425314445103581406L;

private static class FlyingObject {
  int longtitude;
  int latitude;
  int showlong;
  int showlat;
  String transponder;
  boolean isShown;

  public FlyingObject(int lo, int la, int al, String transponder)
  {
   this.longtitude = lo;
   this.latitude = la;
   this.transponder = transponder;
  }

}

private int scanAngle;
private int step = 5;
private int scanWidth = 20; // degrees
private Font font;
private Graphics pen;
private boolean isShowing;

private Map<String,FlyingObject> fos = new HashMap<String,FlyingObject>();
private long scanTime = 20; // Time to make a step in ms
private JFrame window;
private ImageIcon background;

private void addFo(FlyingObject fo)
{
  synchronized(fos)
  {
   fos.put(fo.transponder,fo);
  }
}

// Display a dot and transponder code for o if it is inside scan cone.
private void putObject(FlyingObject o, Graphics pen)
{

  if (isInScanCone(o.longtitude, o.latitude))
  {
   // The flying oject o, just entered the scan range
   if (!o.isShown)
   {
    o.isShown=true;
    o.showlat = o.latitude;
    o.showlong = o.longtitude;
   }
   int[] coords = radarCrdToScreenCrd(o.showlong, o.showlat);
   Color c = pen.getColor();
   pen.setColor(Color.BLUE);
   pen.fillOval(coords[0], coords[1], 8, 8);
   pen.setColor(Color.WHITE);
   pen.drawString(o.transponder, coords[0]+10, coords[1]);
   pen.setColor(c);
  }
  else
   o.isShown = false;
}

private static int[] radarCrdToScreenCrd(int x, int y)
{
  int[] res = new int[2];
  res[0] = x + 200;res[1] = 200-y;
  return res;
}

private void putLineOnRadar(int x, int y, int x1, int y1, Color c)
{
  if (pen != null)
  {
   Color oc = pen.getColor();
   pen.setColor(c);
   int[] startCrds = radarCrdToScreenCrd(x, y);
   int[] stopCrds = radarCrdToScreenCrd(x1, y1);
   pen.drawLine(startCrds[0],startCrds[1],stopCrds[0],stopCrds[1]);
   pen.setColor(oc);
  }

}

private static double radianToDegrees(double rad) { return 57.2957795 * rad; }

public static int crdToAngle(int x, int y)
{
  double len = Math.sqrt(Math.pow(x,2) + Math.pow(y,2));

  double xAngle = Math.acos( x / len );

  // Q1 => No extra xAngle is the answer
  // Q2 => No extra xAngle is the answer
  // Q3 => x is negative and hence xAngle is 90 degrees off
  // on the vertical axis xAngle is 180 off
  // Q4 => No extra xAngle is 270 degrees off
  double extra = y < 0 ? 360 - radianToDegrees(xAngle) : radianToDegrees(xAngle);

  return (int)(Math.round(extra));
}

private boolean isInScanCone(int x, int y)
{
  int fromAngle = scanAngle - scanWidth;
  int toAngle = scanAngle;
  return crdToAngle(x, y) > fromAngle && crdToAngle(x, y) < toAngle;
}

public Radar()
{
  background = new ImageIcon(Radar.class.getResource("radardisc.jpg"));
  this.setBackground(Color.BLACK);
  font = new Font("Helvetica",Font.BOLD,12);
  setPreferredSize(new Dimension(400, 400));
  scanAngle = (90 % step == 0 ) ? 1 : 0;
  this.window = makeWindow(this);
}

public void stepScan()
{
  scanAngle += step;
  scanAngle = scanAngle % 360;
  this.repaint();
}

@Override
public void paint(Graphics arg0) {
  drawRadarDisc(arg0);
}

private void drawRadarDisc(final Graphics pen)
{

  if (SwingUtilities.isEventDispatchThread())
  {

   if ( (this.pen=pen) != null)
   {
    pen.setFont(font);
    //pen.setColor(new Color(0x3b,0x82,0x0c));

    // Draw disc
    pen.drawImage(background.getImage(),0,0,400,400,background.getImageObserver());

    // Draw center dot
    pen.setColor(Color.BLACK);
    pen.fillOval(195,195,10,10);

    // Draw rings
    for(int d = 10; d < 200;d+=10)
     pen.drawOval(200-d, 200-d, 2*d, 2*d);

    // Draw the flying objects in this radar
    synchronized(fos)
    {
     for(FlyingObject fo : fos.values())
      putObject(fo, pen);
    }

    // Draw the scan line
    putLineOnRadar(0, 0,
      (int)(200*Math.cos(degreesToRadians(scanAngle))),
      (int)(200*Math.sin(degreesToRadians(scanAngle))), Color.YELLOW);

   }
   return;
  }

  // Not the dispatcher thread lets delegate this invocation
  try {
   SwingUtilities.invokeAndWait(new Runnable() {

    @Override
    public void run() {
     drawRadarDisc(pen);
    }

   });
  } catch (Exception e) {
   e.printStackTrace();
  }

}

private static JFrame makeWindow(Component content)
{
  JFrame window = new JFrame();
  window.getContentPane().add(content);
  window.setSize(content.getPreferredSize());
  window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  window.setTitle("VDM Radar");
  window.pack();
  return window;
}

private static double degreesToRadians(int degree)
{
  return (44.0 * degree) / 2520.0;
}

//------------------------------------------------------
// VDM Interface
//------------------------------------------------------

// -- AddFlyingObject: int * int * int * seq of char ==> ()
public Value AddFlyingObject(Value longtitude, Value latitude, Value altitude, Value transponder)
{
  synchronized(this.fos)
  {
   IntegerValue iv = (IntegerValue)longtitude;
   IntegerValue la = (IntegerValue)latitude;

   FlyingObject fo = new FlyingObject( (int)iv.value, (int)la.value, 10, transponder.toString());
   this.addFo(fo);
   return new VoidValue();
  }
}

// -- RemFlyingObject: seq of char ==> ()
public Value RemFlyingObject(Value transponder)
{
  synchronized(this.fos)
  {
   fos.remove(transponder);
   return new VoidValue();
  }
}

// -- UpdateFlyingObject: seq of char * int * int ==> ()
public Value UpdateFlyingObject(Value transponder, Value longtitude, Value latitude)
{
  int lon = (int)((IntegerValue)longtitude).value;
  int lat = (int)((IntegerValue)latitude).value;
  synchronized(this.fos)
  {
   FlyingObject o = fos.get(transponder);
   if (o != null)
   {
    o.longtitude = lon;
    o.latitude = lat;
   }
   return new VoidValue();
  }

}

// -- SetStepSize: int ==> ()
public Value SetStepSize(Value newStep)
{
  this.step = (int)((IntegerValue)newStep).value;
  return new VoidValue();
}

// -- StepRadar: () ==> ()
public Value StepRadar()
{
  // If the window is not shown yet, show it!
  if (!isShowing)
  {
   isShowing = true;
   (window).setVisible(true);
  }

  // step the radar
  this.stepScan();

  // wait a bit to simulate it takes time to scan
  try {
   Thread.sleep(scanTime);
  } catch (InterruptedException e) {
   Thread.currentThread().interrupt();
  }
  return new VoidValue();
}

// -- SetScanWidth: int ==> ()
public Value SetScanWidth(Value width)
{

  this.scanWidth = (int)((IntegerValue)width).value;
  return new VoidValue();
}

// -- SetScanTime: int ==> ()
public Value SetScanTime(Value scanTime)
{
  this.scanTime = (int)((IntegerValue)scanTime).value;
  return new VoidValue();
}

// -- SetWindowPosition: int * int ==> ()
public Value SetWindowPosition(Value ix, Value iy)
{
  int x = (int)((IntegerValue)ix).value;
  int y = (int)((IntegerValue)iy).value;
  this.window.setLocation(x, y);
  return new VoidValue();
}

// -- SetTitle: seq of char ==> ()
public Value SetTitle(Value v)
{
  window.setTitle(v.toString());
  return new VoidValue();
}

// -- SetScanAngle: int ==> ()
public Value SetScanAngle(Value v)
{
  scanAngle = (int)((IntegerValue)v).value;
  return new VoidValue();
}

// -- static ToCharSeq: token ==> seq of char
public static Value ToCharSeq(Value v)
{
  if (v != null)
  {
   System.out.println(v.getClass());

   if (v instanceof NumericValue)
   {
    NumericValue nv = (NumericValue)v;
    return new SeqValue("Number:"+Double.toString(nv.value));
   }

   if (v != null)
    return new SeqValue(v.toString());
  }
  else System.out.println("V is null, Why the face.");
  return new SeqValue();
}

public static void main(String[] args)
{
  Radar r = new Radar();
  r.StepRadar();
}
}

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