Add support for showing spawn points as map markers

src/main/java/org/dynmap/DynmapPlugin.java

@@ -50,6 +50,7 @@ import org.bukkit.event.player.PlayerMoveEvent;
 import org.bukkit.event.player.PlayerQuitEvent;
 import org.bukkit.event.world.ChunkLoadEvent;
 import org.bukkit.event.world.ChunkPopulateEvent;
+import org.bukkit.event.world.SpawnChangeEvent;
 import org.bukkit.event.world.WorldListener;
 import org.bukkit.event.world.WorldLoadEvent;
 import org.bukkit.plugin.Plugin;
@@ -1098,6 +1099,16 @@ public class DynmapPlugin extends JavaPlugin {
                 }
             }
         }
+        @Override
+        public void onSpawnChange(SpawnChangeEvent event) {
+            /* Call listeners */
+            List<Listener> ll = event_handlers.get(event.getType());
+            if(ll != null) {
+                for(Listener l : ll) {
+                    ((WorldListener)l).onSpawnChange(event);
+                }
+            }
+        }
     };
     
     private CustomEventListener ourCustomEventHandler = new CustomEventListener() {
@@ -1158,6 +1169,7 @@ public class DynmapPlugin extends JavaPlugin {
                 case WORLD_LOAD:
                 case CHUNK_LOAD:
                 case CHUNK_POPULATED:
+                case SPAWN_CHANGE:
                     pm.registerEvent(type, ourWorldEventHandler, Event.Priority.Monitor, this);
                     break;
                 case CUSTOM_EVENT:

src/main/java/org/dynmap/MarkersComponent.java

@@ -1,5 +1,13 @@
 package org.dynmap;
 
+import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.event.world.SpawnChangeEvent;
+import org.bukkit.event.world.WorldListener;
+import org.bukkit.event.world.WorldLoadEvent;
+import org.dynmap.markers.Marker;
+import org.dynmap.markers.MarkerIcon;
+import org.dynmap.markers.MarkerSet;
 import org.dynmap.markers.impl.MarkerAPIImpl;
 import org.dynmap.markers.impl.MarkerSignManager;
 
@@ -9,6 +17,9 @@ import org.dynmap.markers.impl.MarkerSignManager;
 public class MarkersComponent extends ClientComponent {
     private MarkerAPIImpl api;
     private MarkerSignManager signmgr;
+    private MarkerIcon spawnicon;
+    private String spawnlbl;
+    
     public MarkersComponent(DynmapPlugin plugin, ConfigurationNode configuration) {
         super(plugin, configuration);
         /* Register API with plugin */
@@ -18,7 +29,55 @@ public class MarkersComponent extends ClientComponent {
         if(configuration.getBoolean("enablesigns", false)) {
             signmgr = MarkerSignManager.initializeSignManager(plugin);
         }
+        /* If we're posting spawn point markers, initialize and add world listener */
+        if(configuration.getBoolean("showspawn", false)) {
+            String ico = configuration.getString("spawnicon", MarkerIcon.WORLD);
+            spawnlbl = configuration.getString("spawnlabel", "Spawn");
+            spawnicon = api.getMarkerIcon(ico); /* Load it */
+            if(spawnicon == null) {
+                spawnicon = api.getMarkerIcon(MarkerIcon.WORLD);
             }
+            WorldListener wl = new WorldListener() {
+                public void onWorldLoad(WorldLoadEvent event) {
+                    World w = event.getWorld(); /* Get the world */
+                    Location loc = w.getSpawnLocation();    /* Get location of spawn */
+                    if(loc != null)
+                        addUpdateWorld(w, loc);
+                }
+                public void onSpawnChange(SpawnChangeEvent event) {
+                    World w = event.getWorld(); /* Get the world */
+                    Location loc = w.getSpawnLocation();    /* Get location of spawn */
+                    if(loc != null)
+                        addUpdateWorld(w, loc);
+                }
+            };
+            plugin.registerEvent(org.bukkit.event.Event.Type.WORLD_LOAD, wl);
+            plugin.registerEvent(org.bukkit.event.Event.Type.SPAWN_CHANGE, wl);
+            /* Initialize already loaded worlds */
+            for(DynmapWorld w : plugin.getMapManager().getWorlds()) {
+                World world = w.world;
+                Location loc = world.getSpawnLocation();
+                if(loc != null)
+                    addUpdateWorld(world, loc);
+            }
+        }
+    }
+    
+    private void addUpdateWorld(World w, Location loc) {
+        MarkerSet ms = api.getMarkerSet(MarkerSet.DEFAULT);
+        if(ms != null) {
+            String spawnid = "_spawn_" + w.getName();
+            Marker m = ms.findMarker(spawnid);    /* See if defined */
+            if(m == null) { /* Not defined yet, add it */
+                ms.createMarker(spawnid, spawnlbl, w.getName(), loc.getX(), loc.getY(), loc.getZ(),
+                                spawnicon, false);
+            }
+            else {
+                m.setLocation(w.getName(), loc.getX(), loc.getY(), loc.getZ());
+            }
+        }
+    }
+
     @Override
     public void dispose() {
         if(signmgr != null) {

src/main/java/org/dynmap/markers/MarkerIcon.java

@@ -8,6 +8,8 @@ public interface MarkerIcon {
     public static final String DEFAULT = "default";
     /** Default sign marker icon - always exists */
     public static final String SIGN = "sign";
+    /** Default world marker icon - always exists */
+    public static final String WORLD = "world";
         
     /**
      * Get ID of the marker icon (unique among marker icons)

src/main/resources/configuration.txt

@@ -49,6 +49,12 @@ components:
     #enablesigns: true
     # If set, make markers layer hidden by default
     #hidebydefault: true
+    # If set, show spawn points on each world
+    showspawn: true
+    # Marker used for spawn point
+    spawnicon: world
+    # Label for spawn points
+    spawnlabel: "Spawn"
     
   - class: org.dynmap.ClientComponent
     type: chat