AltosSiteMap: automatic fetching of map data

3 files changed, 147 insertions, 28 deletions

diff --git a/ao-tools/altosui/AltosSiteMapLabel.java b/ao-tools/altosui/AltosSiteMapLabel.java
new file mode 100644
index 00000000..1a371c5b
--- /dev/null
+++ b/ao-tools/altosui/AltosSiteMapLabel.java
@@ -0,0 +1,142 @@
+/*
+ * Copyright © 2010 Anthony Towns <aj@erisian.com.au>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+package altosui;
+
+import java.awt.*;
+import java.awt.image.*;
+import java.awt.event.*;
+import javax.swing.*;
+import javax.imageio.ImageIO;
+import javax.swing.table.*;
+import java.io.*;
+import java.util.*;
+import java.text.*;
+import java.util.prefs.*;
+import java.net.URL;
+import java.net.URLConnection;
+
+public class AltosSiteMapLabel extends JLabel {
+    public static boolean fetchMap(File file, String url) {
+        URL u;
+        try {
+            u = new URL(url);
+        } catch (java.net.MalformedURLException e) {
+            return false;
+        }
+
+        byte[] data;
+        try {
+            URLConnection uc = u.openConnection();
+            int contentLength = uc.getContentLength();
+            InputStream in = new BufferedInputStream(uc.getInputStream());
+            int bytesRead = 0;
+            int offset = 0;
+            data = new byte[contentLength];
+            while (offset < contentLength) {
+                bytesRead = in.read(data, offset, data.length - offset);
+                if (bytesRead == -1)
+                    break;
+                offset += bytesRead;
+            }
+            in.close();
+
+            if (offset != contentLength) {
+                return false;
+            }
+        } catch (IOException e) {
+            return false;
+        }
+   
+        try {
+            FileOutputStream out = new FileOutputStream(file);
+            out.write(data);
+            out.flush();
+            out.close();
+        } catch (FileNotFoundException e) {
+            return false;
+        } catch (IOException e) {
+            if (file.exists()) {
+                file.delete();
+            }
+            return false;
+        }
+        return true;
+    }
+
+    public void fetchAndLoadMap(final File pngfile, final String url) {
+        System.out.printf("# Trying to fetch %s...\n", pngfile);
+
+        Thread thread = new Thread() {
+            public void run() {
+                try {
+                    if (fetchMap(pngfile, url)) {
+                        setIcon(new ImageIcon(ImageIO.read(pngfile)));
+                    }
+                } catch (Exception e) {
+                    System.out.printf("# Failed to fetch file %s\n", pngfile);
+                    System.out.printf(" wget -O '%s' ''\n", pngfile, url);
+                }
+            }
+        };
+        thread.start();
+    }
+
+    public void fetchMap(double lat, double lng, int zoom, int px_size) {
+        File pngfile = MapFile(lat, lng, zoom);
+        String url = MapURL(lat, lng, zoom, px_size);
+
+        if (!pngfile.exists()) {
+            fetchMap(pngfile, url);
+        }
+    }
+
+    public void loadMap(double lat, double lng, int zoom, int px_size) {
+        File pngfile = MapFile(lat, lng, zoom);
+        String url = MapURL(lat, lng, zoom, px_size);
+        
+        if (!pngfile.exists()) {
+            fetchAndLoadMap(pngfile, url);
+            return;
+        }
+
+        try {
+            setIcon(new ImageIcon(ImageIO.read(pngfile)));
+            return;
+        } catch (IOException e) { 
+            System.out.printf("# IO error trying to load %s\n", pngfile);
+            return;
+        }
+    }
+
+    private static File MapFile(double lat, double lng, int zoom) {
+        char chlat = lat < 0 ? 'S' : 'N';
+        char chlng = lng < 0 ? 'E' : 'W';
+        if (lat < 0) lat = -lat;
+        if (lng < 0) lng = -lng;
+        return new File(AltosPreferences.logdir(), 
+                String.format("map-%c%.6f,%c%.6f-%d.png",
+                    chlat, lat, chlng, lng, zoom));
+    }
+
+    private static String MapURL(double lat, double lng, 
+            int zoom, int px_size) 
+    {
+        return String.format("http://maps.google.com/maps/api/staticmap?center=%.6f,%.6f&zoom=%d&size=%dx%d&sensor=false&maptype=hybrid&format=png32", lat, lng, zoom, px_size, px_size);
+    }
+}
+
diff --git a/ao-tools/altosui/AltosSiteMapTile.java b/ao-tools/altosui/AltosSiteMapTile.java
index ca68412a..56bc98af 100644
--- a/ao-tools/altosui/AltosSiteMapTile.java
+++ b/ao-tools/altosui/AltosSiteMapTile.java
@@ -37,7 +37,7 @@ public class AltosSiteMapTile extends JLayeredPane {
     Point2D.Double coord_pt;
     Point2D.Double last_pt;
 
-    JLabel mapLabel;
+    AltosSiteMapLabel mapLabel;
     JLabel draw;
     Graphics2D g2d;
 
@@ -48,15 +48,7 @@ public class AltosSiteMapTile extends JLayeredPane {
 
     private void loadMap() {
         Point2D.Double map_latlng = latlng(px_size/2, px_size/2);
-        File pngfile = new File(AltosPreferences.logdir(), 
-                                FileCoord(map_latlng, zoom));
-        try {
-            mapLabel.setIcon(new ImageIcon(ImageIO.read(pngfile)));
-        } catch (Exception e) { 
-            // throw new RuntimeException(e);
-            System.out.printf("# Failed to find file %s\n", pngfile);
-            System.out.printf(" wget -O '%s' 'http://maps.google.com/maps/api/staticmap?center=%.6f,%.6f&zoom=%d&size=%dx%d&sensor=false&maptype=hybrid&format=png32'\n", pngfile, map_latlng.x, map_latlng.y, zoom, px_size, px_size);
-        }
+        mapLabel.loadMap(map_latlng.x, map_latlng.y, zoom, px_size);
     }
 
     private boolean setLocation(double lat, double lng) {
@@ -88,22 +80,6 @@ public class AltosSiteMapTile extends JLayeredPane {
         return v;
     }
 
-    private static String FileCoord(Point2D.Double latlng, int zoom) {
-        double lat, lng;
-        lat = latlng.x;
-        lng = latlng.y;
-        return FileCoord(lat, lng, zoom);
-    }
-    private static String FileCoord(double lat, double lng, int zoom) {
-        char chlat = lat < 0 ? 'S' : 'N';
-        char chlng = lng < 0 ? 'E' : 'W';
-        if (lat < 0) lat = -lat;
-        if (lng < 0) lng = -lng;
-        return String.format("map-%c%.6f,%c%.6f-%d.png",
-                chlat, lat, chlng, lng, zoom);
-    }
-
-
     // based on google js
     //  http://maps.gstatic.com/intl/en_us/mapfiles/api-3/2/10/main.js
     // search for fromLatLngToPoint and fromPointToLatLng
@@ -172,7 +148,7 @@ public class AltosSiteMapTile extends JLayeredPane {
         if (last_pt == null) {
             setLocation(state.pad_lat, state.pad_lon);
             loadMap();
-            last_pt = pt;
+            last_pt = pt(state.pad_lat, state.pad_lon);
         }
 
         Point2D.Double pt = pt(state.gps.lat, state.gps.lon);
@@ -221,7 +197,7 @@ public class AltosSiteMapTile extends JLayeredPane {
     public AltosSiteMapTile(int x_tile_offset, int y_tile_offset) {
         setPreferredSize(new Dimension(px_size, px_size));
 
-        mapLabel = new JLabel();
+        mapLabel = new AltosSiteMapLabel();
         fillLabel(mapLabel, Color.GRAY);
         mapLabel.setOpaque(true);
         mapLabel.setBounds(0, 0, px_size, px_size);
diff --git a/ao-tools/altosui/Makefile.am b/ao-tools/altosui/Makefile.am
index 41afdf27..334608f6 100644
--- a/ao-tools/altosui/Makefile.am
+++ b/ao-tools/altosui/Makefile.am
@@ -63,6 +63,7 @@ altosui_JAVA = \
 	AltosSerialInUseException.java \
 	AltosSerialMonitor.java \
 	AltosSiteMap.java \
+	AltosSiteMapLabel.java \
 	AltosSiteMapTile.java \
 	AltosState.java \
 	AltosTelemetry.java \