Changeset 9952 in josm for trunk/src/org/openstreetmap/josm/tools

Timestamp:

2016-03-07T23:29:30+01:00 (8 years ago)

Author:

simon04

Message:

see #11516 - Compute multipolygon area, include in MapCSS, JOSM search

File:

• trunk/src/org/openstreetmap/josm/tools/Geometry.java (modified) (2 diffs)

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

@@ -27 +27 @@
 import org.openstreetmap.josm.data.osm.Node;
 import org.openstreetmap.josm.data.osm.NodePositionComparator;
+import org.openstreetmap.josm.data.osm.OsmPrimitive;
 import org.openstreetmap.josm.data.osm.OsmPrimitiveType;
 import org.openstreetmap.josm.data.osm.Relation;
 import org.openstreetmap.josm.data.osm.RelationMember;
 import org.openstreetmap.josm.data.osm.Way;
+import org.openstreetmap.josm.data.osm.visitor.paint.relations.Multipolygon;
+import org.openstreetmap.josm.data.osm.visitor.paint.relations.MultipolygonCache;
 import org.openstreetmap.josm.data.projection.Projection;
 import org.openstreetmap.josm.data.projection.Projections;
@@ -638 +641 @@
     public static double closedWayArea(Way way) {
         return getAreaAndPerimeter(way.getNodes(), Projections.getProjectionByCode("EPSG:54008")).getArea();
+    }
+
+    /**
+     * Returns area of a multipolygon in square meters.
+     *
+     * @param multipolygon the multipolygon to measure
+     * @return area of the multipolygon.
+     */
+    public static double multipolygonArea(Relation multipolygon) {
+        double area = 0.0;
+        final Multipolygon mp = Main.map == null || Main.map.mapView == null
+                ? new Multipolygon(multipolygon)
+                : MultipolygonCache.getInstance().get(Main.map.mapView, multipolygon);
+        for (Multipolygon.PolyData pd : mp.getCombinedPolygons()) {
+            area += pd.getAreaAndPerimeter(Projections.getProjectionByCode("EPSG:54008")).getArea();
+        }
+        return area;
+    }
+
+    /**
+     * Computes the area of a closed way and multipolygon in square meters, or {@code null} for other primitives
+     *
+     * @param osm the primitive to measure
+     * @return area of the primitive, or {@code null}
+     */
+    public static Double computeArea(OsmPrimitive osm) {
+        if (osm instanceof Way && ((Way) osm).isClosed()) {
+            return closedWayArea((Way) osm);
+        } else if (osm instanceof Relation && ((Relation) osm).isMultipolygon() && !((Relation) osm).hasIncompleteMembers()) {
+            return multipolygonArea((Relation) osm);
+        } else {
+            return null;
+        }
     }