altoslib: Don't crash if dragging a map view without any tiles

[fw/altos] / altoslib / AltosMap.java

diff --git a/altoslib/AltosMap.java b/altoslib/AltosMap.java
index 8d12a18094007c7cbf30b555c1a52acf49598227..d68cff7a6f99028791c1225336a6a8f7a2fae66a 100644 (file)
--- a/altoslib/AltosMap.java
+++ b/altoslib/AltosMap.java
@@ -131,6 +131,10 @@ public class AltosMap implements AltosMapTileListener, AltosMapStoreListener {
                return (System.currentTimeMillis() - user_input_time) < auto_scroll_delay;
        }
 
+       public boolean has_centre() {
+               return centre != null;
+       }
+
        public boolean far_from_centre(AltosLatLon lat_lon) {
 
                if (centre == null || transform == null)
@@ -423,8 +427,13 @@ public class AltosMap implements AltosMapTileListener, AltosMapStoreListener {
        }
 
        private void drag_stop(int x, int y) {
-               if (!dragged)
+               if (!dragged) {
+                       if (transform == null) {
+                               debug("Transform not set in stop\n");
+                               return;
+                       }
                        map_interface.select_object (transform.screen_lat_lon(new AltosPointInt(x,y)));
+               }
        }
 
        private void line_start(int x, int y) {