gov/nasa/worldwind/examples/StatusBar.java

   1 /*
   2 Copyright (C) 2001, 2006 United States Government
   3 as represented by the Administrator of the
   4 National Aeronautics and Space Administration.
   5 All Rights Reserved.
   6 */
   7 package gov.nasa.worldwind.examples;
   8
   9 import gov.nasa.worldwind.*;
  10 import gov.nasa.worldwind.event.*;
  11 import gov.nasa.worldwind.geom.Position;
  12
  13 import javax.swing.*;
  14 import java.awt.event.*;
  15 import java.awt.*;
  16
  17 /**
  18  * @author tag
  19  * @version $Id: StatusBar.java 3735 2007-12-06 02:20:43Z tgaskins $
  20  */
  21 public class StatusBar extends JPanel implements PositionListener, RenderingListener
  22 {
  23     private WorldWindow eventSource;
  24     private final JLabel latDisplay = new JLabel("");
  25     private final JLabel lonDisplay = new JLabel("Off globe");
  26     private final JLabel altDisplay = new JLabel("");
  27     private final JLabel eleDisplay = new JLabel("");
  28     private boolean showNetworkStatus = true;
  29
  30     public StatusBar()
  31     {
  32         super(new GridLayout(1, 0));
  33
  34         final JLabel heartBeat = new JLabel("Downloading");
  35
  36         altDisplay.setHorizontalAlignment(SwingConstants.CENTER);
  37         latDisplay.setHorizontalAlignment(SwingConstants.CENTER);
  38         lonDisplay.setHorizontalAlignment(SwingConstants.CENTER);
  39         eleDisplay.setHorizontalAlignment(SwingConstants.CENTER);
  40
  41 //        this.add(new JLabel("")); // dummy label to visually balance with heartbeat
  42         this.add(altDisplay);
  43         this.add(latDisplay);
  44         this.add(lonDisplay);
  45         this.add(eleDisplay);
  46         this.add(heartBeat);
  47
  48         heartBeat.setHorizontalAlignment(SwingConstants.CENTER);
  49         heartBeat.setForeground(new java.awt.Color(255, 0, 0, 0));
  50
  51         Timer downloadTimer = new Timer(100, new ActionListener()
  52         {
  53             public void actionPerformed(java.awt.event.ActionEvent actionEvent)
  54             {
  55                 if (!showNetworkStatus)
  56                 {
  57                     if (heartBeat.getText().length() > 0)
  58                         heartBeat.setText("");
  59                     return;
  60                 }
  61
  62                 if (WorldWind.getNetworkStatus().isNetworkUnavailable())
  63                 {
  64                     heartBeat.setText("No Network");
  65                     heartBeat.setForeground(new java.awt.Color(255, 0, 0, 255));
  66                     return;
  67                 }
  68
  69                 java.awt.Color color = heartBeat.getForeground();
  70                 int alpha = color.getAlpha();
  71                 if (WorldWind.getRetrievalService().hasActiveTasks())
  72                 {
  73                     heartBeat.setText("Downloading");
  74                     if (alpha == 255)
  75                         alpha = 255;
  76                     else
  77                         alpha = alpha < 16 ? 16 : Math.min(255, alpha + 20);
  78                 }
  79                 else
  80                 {
  81                     alpha = Math.max(0, alpha - 20);
  82                 }
  83                 heartBeat.setForeground(new java.awt.Color(255, 0, 0, alpha));
  84             }
  85         });
  86         downloadTimer.start();
  87     }
  88
  89     public void setEventSource(WorldWindow newEventSource)
  90     {
  91         if (this.eventSource != null)
  92         {
  93             this.eventSource.removePositionListener(this);
  94             this.eventSource.removeRenderingListener(this);
  95         }
  96
  97         if (newEventSource != null)
  98         {
  99             newEventSource.addPositionListener(this);
 100             newEventSource.addRenderingListener(this);
 101         }
 102
 103         this.eventSource = newEventSource;
 104     }
 105
 106     public boolean isShowNetworkStatus()
 107     {
 108         return showNetworkStatus;
 109     }
 110
 111     public void setShowNetworkStatus(boolean showNetworkStatus)
 112     {
 113         this.showNetworkStatus = showNetworkStatus;
 114     }
 115
 116     public void moved(PositionEvent event)
 117     {
 118         this.handleCursorPositionChange(event);
 119     }
 120
 121     public WorldWindow getEventSource()
 122     {
 123         return this.eventSource;
 124     }
 125
 126     private void handleCursorPositionChange(PositionEvent event)
 127     {
 128         Position newPos = event.getPosition();
 129         if (newPos != null)
 130         {
 131             String las = String.format("Lat %7.4f\u00B0", newPos.getLatitude().getDegrees());
 132             String los = String.format("Lon %7.4f\u00B0", newPos.getLongitude().getDegrees());
 133             String els = String.format("Elev %,7d meters", (int)
 134                 (eventSource.getModel().getGlobe().getElevation(newPos.getLatitude(), newPos.getLongitude())));
 135             latDisplay.setText(las);
 136             lonDisplay.setText(los);
 137             eleDisplay.setText(els);
 138         }
 139         else
 140         {
 141             latDisplay.setText("");
 142             lonDisplay.setText("Off globe");
 143             eleDisplay.setText("");
 144         }
 145     }
 146
 147     public void stageChanged(RenderingEvent event)
 148     {
 149         if (eventSource.getView() != null && eventSource.getView().getEyePosition() != null)
 150             altDisplay.setText(String.format("Altitude %,7d km",
 151                 (int) Math.round(eventSource.getView().getEyePosition().getElevation() / 1e3)));
 152         else
 153             altDisplay.setText("Altitude");
 154     }
 155 }