Changeset 9559 in josm

Timestamp:

2016-01-21T17:20:12+01:00 (8 years ago)

Author:

bastiK

Message:

auto-detect poles in view (see #12186)

Location:

trunk/src/org/openstreetmap/josm/data/projection

Files:

• CustomProjection.java (modified) (6 diffs)
• proj/IPolar.java (deleted)
• proj/PolarStereographic.java (modified) (2 diffs)

trunk/src/org/openstreetmap/josm/data/projection/CustomProjection.java

@@ -5 +5 @@
 
 import java.util.ArrayList;
+import java.util.EnumMap;
 import java.util.HashMap;
 import java.util.List;
@@ -11 +12 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.openstreetmap.josm.Main;
 import org.openstreetmap.josm.data.Bounds;
@@ -26 +26 @@
 import org.openstreetmap.josm.data.projection.datum.WGS84Datum;
 import org.openstreetmap.josm.data.projection.proj.ICentralMeridianProvider;
-import org.openstreetmap.josm.data.projection.proj.IPolar;
 import org.openstreetmap.josm.data.projection.proj.Mercator;
 import org.openstreetmap.josm.data.projection.proj.Proj;
@@ -156 +155 @@
     }
 
+    private enum Polarity { NORTH, SOUTH }
+
+    private EnumMap<Polarity, EastNorth> polesEN;
+    private EnumMap<Polarity, LatLon> polesLL;
+    {
+        polesLL = new EnumMap<>(Polarity.class);
+        polesLL.put(Polarity.NORTH, LatLon.NORTH_POLE);
+        polesLL.put(Polarity.SOUTH, LatLon.SOUTH_POLE);
+    }
+
     /**
      * Constructs a new empty {@code CustomProjection}.
@@ -761 +770 @@
     }
 
+    private EastNorth getPole(Polarity whichPole) {
+        if (polesEN == null) {
+            polesEN = new EnumMap<>(Polarity.class);
+            for (Polarity p : Polarity.values()) {
+                polesEN.put(p, null);
+                LatLon ll = polesLL.get(p);
+                try {
+                    EastNorth enPole = latlon2eastNorth(ll);
+                    if (enPole.isValid()) {
+                        // project back and check if the result is somewhat reasonable
+                        LatLon llBack = eastNorth2latlon(enPole);
+                        if (llBack.isValid() && ll.greatCircleDistance(llBack) < 1000) {
+                            polesEN.put(p, enPole);
+                        }
+                    }
+                } catch (Exception e) {}
+            }
+        }
+        return polesEN.get(whichPole);
+    }
+
     @Override
     public Bounds getLatLonBoundsBox(ProjectionBounds r) {
@@ -788 +818 @@
         // if the box contains one of the poles, the above method did not get
         // correct min/max latitude value
-        if (proj instanceof IPolar) {
-            IPolar polarProj = (IPolar) proj;
-            if (polarProj.hasPole(false)) {
-                EastNorth enNorthPole = latlon2eastNorth(LatLon.NORTH_POLE);
-                if (r.contains(enNorthPole)) {
-                    result.extend(LatLon.NORTH_POLE);
-                }
-            }
-            if (polarProj.hasPole(true)) {
-                EastNorth enSouthPole = latlon2eastNorth(LatLon.SOUTH_POLE);
-                if (r.contains(enSouthPole)) {
-                    result.extend(LatLon.SOUTH_POLE);
-                }
+        for (Polarity p : Polarity.values()) {
+            EastNorth pole = getPole(p);
+            if (pole != null && r.contains(pole)) {
+                result.extend(polesLL.get(p));
             }
         }

trunk/src/org/openstreetmap/josm/data/projection/proj/PolarStereographic.java

@@ -57 +57 @@
  * @since 9419
  */
-public class PolarStereographic extends AbstractProj implements IPolar {
+public class PolarStereographic extends AbstractProj {
     /**
      * Maximum number of iterations for iterative computations.
@@ -181 +181 @@
         }
     }
-
-    @Override
-    public boolean hasPole(boolean south) {
-        return south == southPole;
-    }
 }