Merge pull request #1371 from osmdroid/bug/#1299_3

bug/#1299_3 - demo for "Snappable" feature
osmdroid · Jul 15, 2019 · 7b4bfbd · 7b4bfbd
2 parents 12977ee + e6d012f
commit 7b4bfbd
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diff --git a/OpenStreetMapViewer/src/main/java/org/osmdroid/samplefragments/SampleFactory.java b/OpenStreetMapViewer/src/main/java/org/osmdroid/samplefragments/SampleFactory.java
@@ -37,6 +37,7 @@
 import org.osmdroid.samplefragments.data.SampleSimpleFastPointOverlay;
 import org.osmdroid.samplefragments.data.SampleSimpleLocation;
 import org.osmdroid.samplefragments.events.SampleAnimateToWithOrientation;
+import org.osmdroid.samplefragments.events.SampleSnappable;
 import org.osmdroid.samplefragments.tileproviders.SampleTileStates;
 import org.osmdroid.samplefragments.data.SampleWithMinimapItemizedOverlayWithFocus;
 import org.osmdroid.samplefragments.data.SampleWithMinimapItemizedOverlayWithScale;
@@ -305,6 +306,7 @@ private SampleFactory() {
         mSamples.add(SampleTileStates.class);
         mSamples.add(SampleAnimateToWithOrientation.class);
         mSamples.add(SampleMapSnapshot.class);
+        mSamples.add(SampleSnappable.class);
     }
 
     public void addSample(Class<? extends BaseSampleFragment> clz) {

diff --git a/OpenStreetMapViewer/src/main/java/org/osmdroid/samplefragments/events/SampleSnappable.java b/OpenStreetMapViewer/src/main/java/org/osmdroid/samplefragments/events/SampleSnappable.java
@@ -0,0 +1,48 @@
+package org.osmdroid.samplefragments.events;
+
+import android.graphics.Point;
+
+import org.osmdroid.api.IMapView;
+import org.osmdroid.api.IProjection;
+import org.osmdroid.samplefragments.BaseSampleFragment;
+import org.osmdroid.util.GeoPoint;
+import org.osmdroid.views.overlay.Overlay;
+
+/**
+ * @since 6.1.0
+ * @author Fabrice Fontaine
+ */
+public class SampleSnappable extends BaseSampleFragment {
+
+    // cf. https://en.wikipedia.org/wiki/Gare_de_Perpignan
+    private final GeoPoint MAP_CENTER = new GeoPoint(42.696111, 2.879444);
+
+    @Override
+    public String getSampleTitle() {
+        return "Snappable";
+    }
+
+    class MyOverlay extends Overlay implements Overlay.Snappable {
+
+        @Override
+        public boolean onSnapToItem(int x, int y, Point snapPoint, IMapView mapView) {
+            final IProjection projection = mapView.getProjection();
+            projection.toPixels(MAP_CENTER, snapPoint);
+            return true;
+        }
+    }
+
+    @Override
+    protected void addOverlays() {
+        super.addOverlays();
+
+        mMapView.getOverlayManager().add(new MyOverlay());
+        mMapView.post(new Runnable() {
+            @Override
+            public void run() {
+                mMapView.getController().setZoom(14.);
+                mMapView.setExpectedCenter(MAP_CENTER);
+            }
+        });
+    }
+}