Changeset 10805 in josm for trunk/src/org/openstreetmap/josm/gui/layer/imagery

Timestamp:

2016-08-15T14:45:38+02:00 (8 years ago)

Author:

Don-vip

Message:

fix #13287 - Projection updates to support multiple projections (patch by michael2402) - gsoc-core

File:

• trunk/src/org/openstreetmap/josm/gui/layer/imagery/TileCoordinateConverter.java (modified) (4 diffs)

trunk/src/org/openstreetmap/josm/gui/layer/imagery/TileCoordinateConverter.java

@@ -6 +6 @@
 
 import org.openstreetmap.gui.jmapviewer.Tile;
+import org.openstreetmap.gui.jmapviewer.TileXY;
 import org.openstreetmap.gui.jmapviewer.interfaces.ICoordinate;
+import org.openstreetmap.gui.jmapviewer.interfaces.TileSource;
 import org.openstreetmap.josm.data.coor.LatLon;
+import org.openstreetmap.josm.data.projection.Projecting;
+import org.openstreetmap.josm.data.projection.ShiftedProjecting;
 import org.openstreetmap.josm.gui.MapView;
 import org.openstreetmap.josm.gui.MapViewState.MapViewPoint;
@@ -19 +23 @@
     private MapView mapView;
     private TileSourceDisplaySettings settings;
+    private TileSource tileSource;
 
     /**
      * Create a new coordinate converter for the map view.
      * @param mapView The map view.
+     * @param tileSource The tile source to use when converting coordinates.
      * @param settings displacement settings.
      */
-    public TileCoordinateConverter(MapView mapView, TileSourceDisplaySettings settings) {
+    public TileCoordinateConverter(MapView mapView, TileSource tileSource, TileSourceDisplaySettings settings) {
         this.mapView = mapView;
+        this.tileSource = tileSource;
         this.settings = settings;
     }
@@ -32 +39 @@
     private MapViewPoint pos(ICoordinate ll) {
         return mapView.getState().getPointFor(new LatLon(ll)).add(settings.getDisplacement());
+    }
+
+    /**
+     * Gets the projecting instance to use to convert between latlon and eastnorth coordinates.
+     * @return The {@link Projecting} instance.
+     */
+    public Projecting getProjecting() {
+        return new ShiftedProjecting(mapView.getProjection(), settings.getDisplacement());
     }
 
@@ -55 +70 @@
         return pos(c1).rectTo(pos(c2)).getInView();
     }
+
+    /**
+     * Returns average number of screen pixels per tile pixel for current mapview
+     * @param zoom zoom level
+     * @return average number of screen pixels per tile pixel
+     */
+    public double getScaleFactor(int zoom) {
+        LatLon topLeft = mapView.getLatLon(0, 0);
+        LatLon botRight = mapView.getLatLon(mapView.getWidth(), mapView.getHeight());
+        TileXY t1 = tileSource.latLonToTileXY(topLeft.toCoordinate(), zoom);
+        TileXY t2 = tileSource.latLonToTileXY(botRight.toCoordinate(), zoom);
+
+        int screenPixels = mapView.getWidth()*mapView.getHeight();
+        double tilePixels = Math.abs((t2.getY()-t1.getY())*(t2.getX()-t1.getX())*tileSource.getTileSize()*tileSource.getTileSize());
+        if (screenPixels == 0 || tilePixels == 0) return 1;
+        return screenPixels/tilePixels;
+    }
 }