Version 7, February 2009

[GpsPrune.git] / tim / prune / gui / map / MapTileCacher.java

diff --git a/tim/prune/gui/map/MapTileCacher.java b/tim/prune/gui/map/MapTileCacher.java
index 50387dd4f9a9c7059d047e0c8347fd646950eada..ea5b6fb769813d7e3c0b4700fc55698454dec2db 100644 (file)
--- a/tim/prune/gui/map/MapTileCacher.java
+++ b/tim/prune/gui/map/MapTileCacher.java
@@ -14,8 +14,6 @@ public class MapTileCacher implements ImageObserver
 {
        /** Parent to be informed of updates */
        private MapCanvas _parent = null;
-       /** Default grid size */
-       private static final int GRID_SIZE = 11;
        /** Array of images to hold tiles */
        private Image[] _tiles = new Image[GRID_SIZE * GRID_SIZE];
        /** Current zoom level */
@@ -28,6 +26,13 @@ public class MapTileCacher implements ImageObserver
        private int _gridCentreX = 0;
        /** Y coord of grid centre */
        private int _gridCentreY = 0;
+       /** Tile configuration */
+       private MapTileConfig _tileConfig = null;
+
+       /** Grid size */
+       private static final int GRID_SIZE = 11;
+       /** max zoom level of map tiles */
+       private static final int MAX_TILE_ZOOM = 18;
 
 
        /**
@@ -82,6 +87,7 @@ public class MapTileCacher implements ImageObserver
         */
        public Image getTile(int inX, int inY)
        {
+               if (_tileConfig == null) {_tileConfig = new MapTileConfig();}
                int arrayIndex = getArrayIndex(inX, inY);
                Image image = _tiles[arrayIndex];
                if (image != null)
@@ -90,13 +96,17 @@ public class MapTileCacher implements ImageObserver
                        return image;
                }
 
+               // Protect against zoom > max
+               if (isOverzoomed()) return null;
+
                // Trigger load if not already triggered
                // Work out tile coords for URL
                int urlX = getUrlCoordinate(inX, _zoom);
                int urlY = getUrlCoordinate(inY, _zoom);
                try
                {
-                       String url = "http://tile.openstreetmap.org/" + _zoom + "/" + urlX + "/" + urlY + ".png";
+                       // Use configured tile server
+                       String url = _tileConfig.getUrl() + _zoom + "/" + urlX + "/" + urlY + ".png";
                        // Load image asynchronously, using observer
                        image = Toolkit.getDefaultToolkit().createImage(new URL(url));
                        _tiles[arrayIndex] = image;
@@ -106,6 +116,13 @@ public class MapTileCacher implements ImageObserver
                return null;
        }
 
+       /**
+        * @return true if zoom is too high for tiles
+        */
+       public boolean isOverzoomed()
+       {
+               return (_zoom > MAX_TILE_ZOOM);
+       }
 
        /**
         * Get the array index for the given coordinates
@@ -193,4 +210,14 @@ public class MapTileCacher implements ImageObserver
                }
                return !loaded;
        }
+
+       /**
+        * Set or reset the tile config
+        * @param inConfig object containing tile config
+        */
+       public void setTileConfig(MapTileConfig inConfig)
+       {
+               _tileConfig = inConfig;
+               clearAll();
+       }
 }