Changeset 1722 in josm for trunk/src/org/openstreetmap/josm/tools/OsmUrlToBounds.java

Timestamp:

2009-07-03T12:33:32+02:00 (15 years ago)

Author:

stoecker

Message:

Large rework in projection handling - now allows only switching and more specific projections
TODO:

• allow subprojections (i.e. settings for projections)
• setup preferences for subprojections
• better support of the new projection depending world bounds (how to handle valid data outside of world)
• do not allow to zoom out of the world - zoom should stop when whole world is displayed
• fix Lambert and SwissGrid to handle new OutOfWorld style and subprojections
• fix new UTM projection
• handle layers with fixed projection on projection change
• allow easier projection switching (e.g. in menu)

NOTE:
This checkin very likely will cause problems. Please report or fix them. Older plugins may have trouble. The SVN plugins
have been fixed but may have problems nevertheless. This is a BIG change, but will make JOSMs internal structure much cleaner
and reduce lots of projection related problems.

File:

• trunk/src/org/openstreetmap/josm/tools/OsmUrlToBounds.java (modified) (1 diff)

trunk/src/org/openstreetmap/josm/tools/OsmUrlToBounds.java

@@ -55 +55 @@
         return Double.parseDouble(map.get("m"+key));
     }
+
+    static public int getZoom(Bounds b)
+    {
+        // convert to mercator (for calculation of zoom only)
+        double latMin = Math.log(Math.tan(Math.PI/4.0+b.min.lat()/180.0*Math.PI/2.0))*180.0/Math.PI;
+        double latMax = Math.log(Math.tan(Math.PI/4.0+b.max.lat()/180.0*Math.PI/2.0))*180.0/Math.PI;
+        double size = Math.max(Math.abs(latMax-latMin), Math.abs(b.max.lon()-b.min.lon()));
+        int zoom = 0;
+        while (zoom <= 20) {
+            if (size >= 180)
+                break;
+            size *= 2;
+            zoom++;
+        }
+        return zoom;
+    }
+
+    static public String getURL(Bounds b)
+    {
+        return getURL(b.center(), getZoom(b));
+    }
+
+    static public String getURL(LatLon pos, int zoom)
+    {
+        // Truncate lat and lon to something more sensible
+        int decimals = (int) Math.pow(10, (zoom / 3));
+        double lat = (Math.round(pos.lat() * decimals))/decimals;
+        double lon = (Math.round(pos.lon() * decimals))/decimals;
+        return new String("http://www.openstreetmap.org/?lat="+lat+"&lon="+lon+"&zoom="+zoom);
+    }
 }