Changeset 9263 in osm for applications/viewer/jmapviewer/src

Timestamp:

2008-07-23T17:32:42+02:00 (16 years ago)

Author:

stotz

Message:

Replaced: strategy algorithm for displaying tiles of other zoom levels while the correct tiles are being loaded

Location:

applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer

Files:

• Demo.java (modified) (1 diff)
• JMapViewer.java (modified) (4 diffs)
• Tile.java (modified) (4 diffs)

applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/Demo.java

@@ -79 +79 @@
                 map.addMapMarker(new MapMarkerDot(49.807, 8.644));
 
-                // map.setDisplayPositionByLatLon(49.807, 8.644, 11);
+                map.setDisplayPositionByLatLon(49.807, 8.6, 11);
+                //map.setTileGridVisible(true);
         }
 

applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/JMapViewer.java

@@ -304 +304 @@
                                 Tile tile = getTile(tilex, tiley_tmp, zoom);
                                 if (tile != null) {
-                                        if (!tile.isLoaded()) {
-                                                // Paint stretched preview from the next lower zoom
-                                                // level (if already loaded)
-                                                Tile parent = tile.getParentTile(tileCache);
-                                                if (parent != null && parent.isLoaded()) {
-                                                        int parentx = tile.getXtile() % 2;
-                                                        int parenty = tile.getYtile() % 2;
-                                                        parent.parentPaint(g, x, y, parentx, parenty);
-                                                } else
-                                                        tile.paint(g, x, y);
-                                        } else
-                                                tile.paint(g, x, y);
+                                        tile.paint(g, x, y);
+                                        if (tileGridVisible)
+                                                g.drawRect(x, y, Tile.WIDTH, Tile.HEIGHT);
                                 }
-                                if (tileGridVisible)
-                                        g.drawRect(x, y, Tile.WIDTH, Tile.HEIGHT);
                                 tiley_tmp++;
                         }
                         tilex++;
                 }
+                g.fillOval(getWidth()/2 - 5, getHeight()/2 - 5, 10, 10);
+                g.drawString("Test", 50, 10);
                 if (!mapMarkersVisible || mapMarkerList == null)
                         return;
@@ -400 +391 @@
                         tile = new Tile(tilex, tiley, zoom, loadingImage);
                         tileCache.addTile(tile);
+                        tile.loadPlaceholderFromCache(tileCache);
                 }
                 if (!tile.isLoaded()) {
@@ -409 +401 @@
                                                 return;
                                         try {
-                                                // Thread.sleep(500);
+                                                Thread.sleep(500);
                                                 tile.loadTileImage();
                                                 repaint();
@@ -470 +462 @@
         }
 
+        public TileCache getTileCache() {
+                return tileCache;
+        }
+
 }

applications/viewer/jmapviewer/src/org/openstreetmap/gui/jmapviewer/Tile.java

@@ -4 +4 @@
 
 import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.geom.AffineTransform;
 import java.awt.image.BufferedImage;
 import java.io.DataInputStream;
@@ -53 +55 @@
 
         /**
+         * Tries to get tiles of a lower or higher zoom level (one or two level
+         * difference) from cache and use it as a placeholder until the tile has
+         * been loaded.
+         */
+        public void loadPlaceholderFromCache(TileCache cache) {
+                BufferedImage tmpImage = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
+                Graphics2D g = (Graphics2D) tmpImage.getGraphics();
+                // g.drawImage(image, 0, 0, null);
+                for (int zoomDiff = 1; zoomDiff < 3; zoomDiff++) {
+                        // first we check if there are already the 2^x tiles
+                        // of a higher detail level
+                        int zoom_high = zoom + zoomDiff;
+                        if (zoom_high <= JMapViewer.MAX_ZOOM) {
+                                int factor = 1 << zoomDiff;
+                                int xtile_high = xtile << zoomDiff;
+                                int ytile_high = ytile << zoomDiff;
+                                double scale = 1.0 / factor;
+                                g.setTransform(AffineTransform.getScaleInstance(scale, scale));
+                                int paintedTileCount = 0;
+                                for (int x = 0; x < factor; x++) {
+                                        for (int y = 0; y < factor; y++) {
+                                                Tile tile = cache.getTile(xtile_high + x, ytile_high + y, zoom_high);
+                                                if (tile != null && tile.isLoaded()) {
+                                                        paintedTileCount++;
+                                                        tile.paint(g, x * WIDTH, y * HEIGHT);
+                                                }
+                                        }
+                                }
+                                if (paintedTileCount == factor * factor) {
+                                        image = tmpImage;
+                                        return;
+                                }
+                        }
+
+                        int zoom_low = zoom - zoomDiff;
+                        if (zoom_low >= JMapViewer.MIN_ZOOM) {
+                                int xtile_low = xtile >> zoomDiff;
+                                int ytile_low = ytile >> zoomDiff;
+                                int factor = (1 << zoomDiff);
+                                double scale = (double) factor;
+                                AffineTransform at = new AffineTransform();
+                                int translate_x = (xtile % factor) * WIDTH;
+                                int translate_y = (ytile % factor) * HEIGHT;
+                                at.setTransform(scale, 0, 0, scale, -translate_x, -translate_y);
+                                g.setTransform(at);
+                                Tile tile = cache.getTile(xtile_low, ytile_low, zoom_low);
+                                if (tile != null && tile.isLoaded()) {
+                                        tile.paint(g, 0, 0);
+                                        image = tmpImage;
+                                        return;
+                                }
+                        }
+                }
+        }
+
+        /**
          * @return tile number on the x axis of this tile
          */
@@ -88 +146 @@
         }
 
-        /**
-         * Retrieves the "parent tile" from the specified tile cache. A parent tile
-         * is the tile of a lower zoom level (coarser resolution) at the same
-         * position of the map. Parent tiles are used for a preview until the tile
-         * has been loaded.
-         * 
-         * @param tileCache
-         * @return
-         */
-        public Tile getParentTile(TileCache tileCache) {
-                if (zoom < 1)
-                        return null;
-                return tileCache.getTile(xtile / 2, ytile / 2, zoom - 1);
-        }
-
         public synchronized void loadTileImage() throws IOException {
                 if (loaded)
@@ -132 +175 @@
                 if (image == null)
                         return;
-                /*
-                 * if (image.getHeight() < OSMMap.TILE_HEIGHT || image.getWidth() <
-                 * OSMMap.TILE_WIDTH) { x += (OSMMap.TILE_WIDTH - image.getWidth()) / 2;
-                 * y += (OSMMap.TILE_HEIGHT - image.getHeight()) / 2; }
-                 */
                 g.drawImage(image, x, y, null);
-        }
-
-        public void paint(Graphics g, int x, int y, int stretch) {
-                if (image == null)
-                        return;
-                int tx = x * stretch;
-                int ty = y = stretch;
-                g.drawImage(image, x, y, tx, ty, 0, 0, image.getWidth(), image.getHeight(), null);
-        }
-
-        /**
-         * Paints one-fourth of the tile image {@link Graphics} <code>g</code> at
-         * the position <code>x</code>/<code>y</code>.
-         * 
-         * @param g
-         * @param x
-         * @param y
-         * @param partx
-         *            (0 or 1) selects if the left or right part of tile should be
-         *            painted
-         * @param party
-         *            (0 or 1) selects if the upper or lower part of tile should be
-         *            painted
-         */
-        public void parentPaint(Graphics g, int x, int y, int partx, int party) {
-                int sx = 0;
-                int sy = 0;
-                if (partx == 1)
-                        sx = WIDTH_HALF;
-                if (party == 1)
-                        sy = HEIGHT_HALF;
-                g.drawImage(image, x, y, x + WIDTH, y + HEIGHT, sx, sy, sx + WIDTH_HALF, sy + HEIGHT_HALF,
-                                null);
         }