001    package net.minecraft.world;
002    
003    import java.util.ArrayList;
004    import java.util.Collections;
005    import java.util.HashMap;
006    import java.util.Iterator;
007    import java.util.List;
008    import java.util.Random;
009    import net.minecraft.block.Block;
010    import net.minecraft.block.material.Material;
011    import net.minecraft.entity.EntityLiving;
012    import net.minecraft.entity.EnumCreatureType;
013    import net.minecraft.entity.monster.EntitySkeleton;
014    import net.minecraft.entity.monster.EntitySpider;
015    import net.minecraft.entity.monster.EntityZombie;
016    import net.minecraft.entity.player.EntityPlayer;
017    import net.minecraft.util.ChunkCoordinates;
018    import net.minecraft.util.MathHelper;
019    import net.minecraft.util.WeightedRandom;
020    import net.minecraft.world.biome.BiomeGenBase;
021    import net.minecraft.world.biome.SpawnListEntry;
022    import net.minecraft.world.chunk.Chunk;
023    
024    import net.minecraftforge.common.MinecraftForge;
025    import net.minecraftforge.event.entity.living.LivingSpecialSpawnEvent;
026    
027    public final class SpawnerAnimals
028    {
029        /** The 17x17 area around the player where mobs can spawn */
030        private static HashMap eligibleChunksForSpawning = new HashMap();
031    
032        /** An array of entity classes that spawn at night. */
033        protected static final Class[] nightSpawnEntities = new Class[] {EntitySpider.class, EntityZombie.class, EntitySkeleton.class};
034    
035        /**
036         * Given a chunk, find a random position in it.
037         */
038        protected static ChunkPosition getRandomSpawningPointInChunk(World par0World, int par1, int par2)
039        {
040            Chunk var3 = par0World.getChunkFromChunkCoords(par1, par2);
041            int var4 = par1 * 16 + par0World.rand.nextInt(16);
042            int var5 = par2 * 16 + par0World.rand.nextInt(16);
043            int var6 = par0World.rand.nextInt(var3 == null ? par0World.getActualHeight() : var3.getTopFilledSegment() + 16 - 1);
044            return new ChunkPosition(var4, var6, var5);
045        }
046    
047        /**
048         * adds all chunks within the spawn radius of the players to eligibleChunksForSpawning. pars: the world,
049         * hostileCreatures, passiveCreatures. returns number of eligible chunks.
050         */
051        public static final int findChunksForSpawning(WorldServer par0WorldServer, boolean par1, boolean par2, boolean par3)
052        {
053            if (!par1 && !par2)
054            {
055                return 0;
056            }
057            else
058            {
059                eligibleChunksForSpawning.clear();
060                int var4;
061                int var7;
062    
063                for (var4 = 0; var4 < par0WorldServer.playerEntities.size(); ++var4)
064                {
065                    EntityPlayer var5 = (EntityPlayer)par0WorldServer.playerEntities.get(var4);
066                    int var6 = MathHelper.floor_double(var5.posX / 16.0D);
067                    var7 = MathHelper.floor_double(var5.posZ / 16.0D);
068                    byte var8 = 8;
069    
070                    for (int var9 = -var8; var9 <= var8; ++var9)
071                    {
072                        for (int var10 = -var8; var10 <= var8; ++var10)
073                        {
074                            boolean var11 = var9 == -var8 || var9 == var8 || var10 == -var8 || var10 == var8;
075                            ChunkCoordIntPair var12 = new ChunkCoordIntPair(var9 + var6, var10 + var7);
076    
077                            if (!var11)
078                            {
079                                eligibleChunksForSpawning.put(var12, Boolean.valueOf(false));
080                            }
081                            else if (!eligibleChunksForSpawning.containsKey(var12))
082                            {
083                                eligibleChunksForSpawning.put(var12, Boolean.valueOf(true));
084                            }
085                        }
086                    }
087                }
088    
089                var4 = 0;
090                ChunkCoordinates var32 = par0WorldServer.getSpawnPoint();
091                EnumCreatureType[] var33 = EnumCreatureType.values();
092                var7 = var33.length;
093    
094                for (int var34 = 0; var34 < var7; ++var34)
095                {
096                    EnumCreatureType var35 = var33[var34];
097    
098                    if ((!var35.getPeacefulCreature() || par2) && (var35.getPeacefulCreature() || par1) && (!var35.getAnimal() || par3) && par0WorldServer.countEntities(var35.getCreatureClass()) <= var35.getMaxNumberOfCreature() * eligibleChunksForSpawning.size() / 256)
099                    {
100                        Iterator var37 = eligibleChunksForSpawning.keySet().iterator();
101                        ArrayList<ChunkCoordIntPair> tmp = new ArrayList(eligibleChunksForSpawning.keySet());
102                        Collections.shuffle(tmp);
103                        var37 = tmp.iterator();
104                        label110:
105    
106                        while (var37.hasNext())
107                        {
108                            ChunkCoordIntPair var36 = (ChunkCoordIntPair)var37.next();
109    
110                            if (!((Boolean)eligibleChunksForSpawning.get(var36)).booleanValue())
111                            {
112                                ChunkPosition var38 = getRandomSpawningPointInChunk(par0WorldServer, var36.chunkXPos, var36.chunkZPos);
113                                int var13 = var38.x;
114                                int var14 = var38.y;
115                                int var15 = var38.z;
116    
117                                if (!par0WorldServer.isBlockNormalCube(var13, var14, var15) && par0WorldServer.getBlockMaterial(var13, var14, var15) == var35.getCreatureMaterial())
118                                {
119                                    int var16 = 0;
120                                    int var17 = 0;
121    
122                                    while (var17 < 3)
123                                    {
124                                        int var18 = var13;
125                                        int var19 = var14;
126                                        int var20 = var15;
127                                        byte var21 = 6;
128                                        SpawnListEntry var22 = null;
129                                        int var23 = 0;
130    
131                                        while (true)
132                                        {
133                                            if (var23 < 4)
134                                            {
135                                                label103:
136                                                {
137                                                    var18 += par0WorldServer.rand.nextInt(var21) - par0WorldServer.rand.nextInt(var21);
138                                                    var19 += par0WorldServer.rand.nextInt(1) - par0WorldServer.rand.nextInt(1);
139                                                    var20 += par0WorldServer.rand.nextInt(var21) - par0WorldServer.rand.nextInt(var21);
140    
141                                                    if (canCreatureTypeSpawnAtLocation(var35, par0WorldServer, var18, var19, var20))
142                                                    {
143                                                        float var24 = (float)var18 + 0.5F;
144                                                        float var25 = (float)var19;
145                                                        float var26 = (float)var20 + 0.5F;
146    
147                                                        if (par0WorldServer.getClosestPlayer((double)var24, (double)var25, (double)var26, 24.0D) == null)
148                                                        {
149                                                            float var27 = var24 - (float)var32.posX;
150                                                            float var28 = var25 - (float)var32.posY;
151                                                            float var29 = var26 - (float)var32.posZ;
152                                                            float var30 = var27 * var27 + var28 * var28 + var29 * var29;
153    
154                                                            if (var30 >= 576.0F)
155                                                            {
156                                                                if (var22 == null)
157                                                                {
158                                                                    var22 = par0WorldServer.spawnRandomCreature(var35, var18, var19, var20);
159    
160                                                                    if (var22 == null)
161                                                                    {
162                                                                        break label103;
163                                                                    }
164                                                                }
165    
166                                                                EntityLiving var39;
167    
168                                                                try
169                                                                {
170                                                                    var39 = (EntityLiving)var22.entityClass.getConstructor(new Class[] {World.class}).newInstance(new Object[] {par0WorldServer});
171                                                                }
172                                                                catch (Exception var31)
173                                                                {
174                                                                    var31.printStackTrace();
175                                                                    return var4;
176                                                                }
177    
178                                                                var39.setLocationAndAngles((double)var24, (double)var25, (double)var26, par0WorldServer.rand.nextFloat() * 360.0F, 0.0F);
179    
180                                                                if (var39.getCanSpawnHere())
181                                                                {
182                                                                    ++var16;
183                                                                    par0WorldServer.spawnEntityInWorld(var39);
184                                                                    creatureSpecificInit(var39, par0WorldServer, var24, var25, var26);
185    
186                                                                    if (var16 >= var39.getMaxSpawnedInChunk())
187                                                                    {
188                                                                        continue label110;
189                                                                    }
190                                                                }
191    
192                                                                var4 += var16;
193                                                            }
194                                                        }
195                                                    }
196    
197                                                    ++var23;
198                                                    continue;
199                                                }
200                                            }
201    
202                                            ++var17;
203                                            break;
204                                        }
205                                    }
206                                }
207                            }
208                        }
209                    }
210                }
211    
212                return var4;
213            }
214        }
215    
216        /**
217         * Returns whether or not the specified creature type can spawn at the specified location.
218         */
219        public static boolean canCreatureTypeSpawnAtLocation(EnumCreatureType par0EnumCreatureType, World par1World, int par2, int par3, int par4)
220        {
221            if (par0EnumCreatureType.getCreatureMaterial() == Material.water)
222            {
223                return par1World.getBlockMaterial(par2, par3, par4).isLiquid() && par1World.getBlockMaterial(par2, par3 - 1, par4).isLiquid() && !par1World.isBlockNormalCube(par2, par3 + 1, par4);
224            }
225            else if (!par1World.doesBlockHaveSolidTopSurface(par2, par3 - 1, par4))
226            {
227                return false;
228            }
229            else
230            {
231                int var5 = par1World.getBlockId(par2, par3 - 1, par4);
232                boolean spawnBlock = (Block.blocksList[var5] != null && Block.blocksList[var5].canCreatureSpawn(par0EnumCreatureType, par1World, par2, par3 - 1, par4));
233                return spawnBlock && var5 != Block.bedrock.blockID && !par1World.isBlockNormalCube(par2, par3, par4) && !par1World.getBlockMaterial(par2, par3, par4).isLiquid() && !par1World.isBlockNormalCube(par2, par3 + 1, par4);
234            }
235        }
236    
237        /**
238         * determines if a skeleton spawns on a spider, and if a sheep is a different color
239         */
240        private static void creatureSpecificInit(EntityLiving par0EntityLiving, World par1World, float par2, float par3, float par4)
241        {
242            if (MinecraftForge.EVENT_BUS.post(new LivingSpecialSpawnEvent(par0EntityLiving, par1World, par2, par3, par4)))
243            {
244                return;
245            }
246    
247            par0EntityLiving.initCreature();
248        }
249    
250        /**
251         * Called during chunk generation to spawn initial creatures.
252         */
253        public static void performWorldGenSpawning(World par0World, BiomeGenBase par1BiomeGenBase, int par2, int par3, int par4, int par5, Random par6Random)
254        {
255            List var7 = par1BiomeGenBase.getSpawnableList(EnumCreatureType.creature);
256    
257            if (!var7.isEmpty())
258            {
259                while (par6Random.nextFloat() < par1BiomeGenBase.getSpawningChance())
260                {
261                    SpawnListEntry var8 = (SpawnListEntry)WeightedRandom.getRandomItem(par0World.rand, var7);
262                    int var9 = var8.minGroupCount + par6Random.nextInt(1 + var8.maxGroupCount - var8.minGroupCount);
263                    int var10 = par2 + par6Random.nextInt(par4);
264                    int var11 = par3 + par6Random.nextInt(par5);
265                    int var12 = var10;
266                    int var13 = var11;
267    
268                    for (int var14 = 0; var14 < var9; ++var14)
269                    {
270                        boolean var15 = false;
271    
272                        for (int var16 = 0; !var15 && var16 < 4; ++var16)
273                        {
274                            int var17 = par0World.getTopSolidOrLiquidBlock(var10, var11);
275    
276                            if (canCreatureTypeSpawnAtLocation(EnumCreatureType.creature, par0World, var10, var17, var11))
277                            {
278                                float var18 = (float)var10 + 0.5F;
279                                float var19 = (float)var17;
280                                float var20 = (float)var11 + 0.5F;
281                                EntityLiving var21;
282    
283                                try
284                                {
285                                    var21 = (EntityLiving)var8.entityClass.getConstructor(new Class[] {World.class}).newInstance(new Object[] {par0World});
286                                }
287                                catch (Exception var23)
288                                {
289                                    var23.printStackTrace();
290                                    continue;
291                                }
292    
293                                var21.setLocationAndAngles((double)var18, (double)var19, (double)var20, par6Random.nextFloat() * 360.0F, 0.0F);
294                                par0World.spawnEntityInWorld(var21);
295                                creatureSpecificInit(var21, par0World, var18, var19, var20);
296                                var15 = true;
297                            }
298    
299                            var10 += par6Random.nextInt(5) - par6Random.nextInt(5);
300    
301                            for (var11 += par6Random.nextInt(5) - par6Random.nextInt(5); var10 < par2 || var10 >= par2 + par4 || var11 < par3 || var11 >= par3 + par4; var11 = var13 + par6Random.nextInt(5) - par6Random.nextInt(5))
302                            {
303                                var10 = var12 + par6Random.nextInt(5) - par6Random.nextInt(5);
304                            }
305                        }
306                    }
307                }
308            }
309        }
310    }