Added API for manipulating map items. Thanks SpaceManiac, codename_B, sk89q and dested!

src/main/java/net/minecraft/server/ItemWorldMap.java

@@ -1,5 +1,10 @@
 package net.minecraft.server;
 
+// CraftBukkit start
+import org.bukkit.Bukkit;
+import org.bukkit.event.server.MapInitializeEvent;
+// CraftBukkit end
+
 public class ItemWorldMap extends ItemWorldMapBase {
 
     protected ItemWorldMap(int i) {
@@ -22,6 +27,11 @@ public class ItemWorldMap extends ItemWorldMapBase {
             worldmap.map = (byte) world.worldProvider.dimension;
             worldmap.a();
             world.a(s, (WorldMapBase) worldmap);
+            
+            // CraftBukkit start
+            MapInitializeEvent event = new MapInitializeEvent(worldmap.mapView);
+            Bukkit.getServer().getPluginManager().callEvent(event);
+            // CraftBukkit end
         }
 
         return worldmap;

src/main/java/net/minecraft/server/WorldMap.java

@@ -11,6 +11,7 @@ import java.util.UUID;
 import org.bukkit.Bukkit;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.map.CraftMapView;
 // CraftBukkit end
 
 public class WorldMap extends WorldMapBase {
@@ -26,13 +27,17 @@ public class WorldMap extends WorldMapBase {
     public List i = new ArrayList();
 
     // CraftBukkit start
+    public final CraftMapView mapView;
     private CraftServer server;
     private UUID uniqueId = null;
     // CraftBukkit end
 
     public WorldMap(String s) {
         super(s);
-        server = (CraftServer) Bukkit.getServer(); // CraftBukkit
+        // CraftBukkit start
+        mapView = new CraftMapView(this);
+        server = (CraftServer) Bukkit.getServer();
+        // CraftBukkit end
     }
 
     public void a(NBTTagCompound nbttagcompound) {

src/main/java/net/minecraft/server/WorldMapHumanTracker.java

@@ -0,0 +1,101 @@
+package net.minecraft.server;
+
+// CraftBukkit start
+import org.bukkit.map.MapCursor;
+import org.bukkit.craftbukkit.entity.CraftPlayer;
+import org.bukkit.craftbukkit.map.RenderData;
+// CraftBukkit end
+
+public class WorldMapHumanTracker {
+
+    public final EntityHuman trackee;
+    public int[] b;
+    public int[] c;
+    private int e;
+    private int f;
+    private byte[] g;
+
+    final WorldMap d;
+
+    public WorldMapHumanTracker(WorldMap worldmap, EntityHuman entityhuman) {
+        this.d = worldmap;
+        this.b = new int[128];
+        this.c = new int[128];
+        this.e = 0;
+        this.f = 0;
+        this.trackee = entityhuman;
+
+        for (int i = 0; i < this.b.length; ++i) {
+            this.b[i] = 0;
+            this.c[i] = 127;
+        }
+    }
+
+    public byte[] a(ItemStack itemstack) {
+        int i;
+        int j;
+        
+        RenderData render = this.d.mapView.render((CraftPlayer) trackee.getBukkitEntity()); // CraftBukkit
+
+        if (--this.f < 0) {
+            this.f = 4;
+            byte[] abyte = new byte[render.cursors.size() * 3 + 1]; // CraftBukkit
+
+            abyte[0] = 1;
+
+            // CraftBukkit start
+            for (i = 0; i < render.cursors.size(); ++i) {
+                MapCursor cursor = render.cursors.get(i);
+                if (!cursor.isVisible()) continue;
+                
+                byte value = (byte) (((cursor.getRawType() == 0 || cursor.getDirection() < 8 ? cursor.getDirection() : cursor.getDirection() - 1) & 15) * 16);
+                abyte[i * 3 + 1] = (byte) (value | (cursor.getRawType() != 0 && value < 0 ? 16 - cursor.getRawType() : cursor.getRawType()));
+                abyte[i * 3 + 2] = (byte) cursor.getX();
+                abyte[i * 3 + 3] = (byte) cursor.getY();
+            }
+            // CraftBukkit end
+
+            boolean flag = true;
+
+            if (this.g != null && this.g.length == abyte.length) {
+                for (j = 0; j < abyte.length; ++j) {
+                    if (abyte[j] != this.g[j]) {
+                        flag = false;
+                        break;
+                    }
+                }
+            } else {
+                flag = false;
+            }
+
+            if (!flag) {
+                this.g = abyte;
+                return abyte;
+            }
+        }
+
+        for (int k = 0; k < 10; ++k) {
+            i = this.e * 11 % 128;
+            ++this.e;
+            if (this.b[i] >= 0) {
+                j = this.c[i] - this.b[i] + 1;
+                int l = this.b[i];
+                byte[] abyte1 = new byte[j + 3];
+
+                abyte1[0] = 0;
+                abyte1[1] = (byte) i;
+                abyte1[2] = (byte) l;
+
+                for (int i1 = 0; i1 < abyte1.length - 3; ++i1) {
+                    abyte1[i1 + 3] = render.buffer[(i1 + l) * 128 + i]; // CraftBukkit
+                }
+
+                this.c[i] = -1;
+                this.b[i] = -1;
+                return abyte1;
+            }
+        }
+
+        return null;
+    }
+}