    001    package net.minecraft.world.gen.structure;
    002
    003    import java.util.HashMap;
    004    import java.util.Iterator;
    005    import java.util.List;
    006    import java.util.Map;
    007    import java.util.Random;
    008    import net.minecraft.crash.CrashReport;
    009    import net.minecraft.crash.CrashReportCategory;
    010    import net.minecraft.util.ReportedException;
    011    import net.minecraft.world.ChunkCoordIntPair;
    012    import net.minecraft.world.ChunkPosition;
    013    import net.minecraft.world.World;
    014    import net.minecraft.world.gen.MapGenBase;
    015
    016    public abstract class MapGenStructure extends MapGenBase
    017    {
    018        /**
    019         * Used to store a list of all structures that have been recursively generated. Used so that during recursive
    020         * generation, the structure generator can avoid generating structures that intersect ones that have already been
    021         * placed.
    022         */
    023        protected Map structureMap = new HashMap();
    024
    025        /**
    026         * Recursively called by generate() (generate) and optionally by itself.
    027         */
    028        protected void recursiveGenerate(World par1World, int par2, int par3, int par4, int par5, byte[] par6ArrayOfByte)
    029        {
    030            if (!this.structureMap.containsKey(Long.valueOf(ChunkCoordIntPair.chunkXZ2Int(par2, par3))))
    031            {
    032                this.rand.nextInt();
    033
    034                try
    035                {
    036                    if (this.canSpawnStructureAtCoords(par2, par3))
    037                    {
    038                        StructureStart var7 = this.getStructureStart(par2, par3);
    039                        this.structureMap.put(Long.valueOf(ChunkCoordIntPair.chunkXZ2Int(par2, par3)), var7);
    040                    }
    041                }
    042                catch (Throwable var10)
    043                {
    044                    CrashReport var8 = CrashReport.makeCrashReport(var10, "Exception preparing structure feature");
    045                    CrashReportCategory var9 = var8.makeCategory("Feature being prepared");
    046                    var9.addCrashSectionCallable("Is feature chunk", new CallableIsFeatureChunk(this, par2, par3));
    047                    var9.addCrashSection("Chunk location", String.format("%d,%d", new Object[] {Integer.valueOf(par2), Integer.valueOf(par3)}));
    048                    var9.addCrashSectionCallable("Chunk pos hash", new CallableChunkPosHash(this, par2, par3));
    049                    var9.addCrashSectionCallable("Structure type", new CallableStructureType(this));
    050                    throw new ReportedException(var8);
    051                }
    052            }
    053        }
    054
    055        /**
    056         * Generates structures in specified chunk next to existing structures. Does *not* generate StructureStarts.
    057         */
    058        public boolean generateStructuresInChunk(World par1World, Random par2Random, int par3, int par4)
    059        {
    060            int var5 = (par3 << 4) + 8;
    061            int var6 = (par4 << 4) + 8;
    062            boolean var7 = false;
    063            Iterator var8 = this.structureMap.values().iterator();
    064
    065            while (var8.hasNext())
    066            {
    067                StructureStart var9 = (StructureStart)var8.next();
    068
    069                if (var9.isSizeableStructure() && var9.getBoundingBox().intersectsWith(var5, var6, var5 + 15, var6 + 15))
    070                {
    071                    var9.generateStructure(par1World, par2Random, new StructureBoundingBox(var5, var6, var5 + 15, var6 + 15));
    072                    var7 = true;
    073                }
    074            }
    075
    076            return var7;
    077        }
    078
    079        /**
    080         * Returns true if the structure generator has generated a structure located at the given position tuple.
    081         */
    082        public boolean hasStructureAt(int par1, int par2, int par3)
    083        {
    084            Iterator var4 = this.structureMap.values().iterator();
    085
    086            while (var4.hasNext())
    087            {
    088                StructureStart var5 = (StructureStart)var4.next();
    089
    090                if (var5.isSizeableStructure() && var5.getBoundingBox().intersectsWith(par1, par3, par1, par3))
    091                {
    092                    Iterator var6 = var5.getComponents().iterator();
    093
    094                    while (var6.hasNext())
    095                    {
    096                        StructureComponent var7 = (StructureComponent)var6.next();
    097
    098                        if (var7.getBoundingBox().isVecInside(par1, par2, par3))
    099                        {
    100                            return true;
    101                        }
    102                    }
    103                }
    104            }
    105
    106            return false;
    107        }
    108
    109        public ChunkPosition getNearestInstance(World par1World, int par2, int par3, int par4)
    110        {
    111            this.worldObj = par1World;
    112            this.rand.setSeed(par1World.getSeed());
    113            long var5 = this.rand.nextLong();
    114            long var7 = this.rand.nextLong();
    115            long var9 = (long)(par2 >> 4) * var5;
    116            long var11 = (long)(par4 >> 4) * var7;
    117            this.rand.setSeed(var9 ^ var11 ^ par1World.getSeed());
    118            this.recursiveGenerate(par1World, par2 >> 4, par4 >> 4, 0, 0, (byte[])null);
    119            double var13 = Double.MAX_VALUE;
    120            ChunkPosition var15 = null;
    121            Iterator var16 = this.structureMap.values().iterator();
    122            ChunkPosition var19;
    123            int var21;
    124            int var20;
    125            double var23;
    126            int var22;
    127
    128            while (var16.hasNext())
    129            {
    130                StructureStart var17 = (StructureStart)var16.next();
    131
    132                if (var17.isSizeableStructure())
    133                {
    134                    StructureComponent var18 = (StructureComponent)var17.getComponents().get(0);
    135                    var19 = var18.getCenter();
    136                    var20 = var19.x - par2;
    137                    var21 = var19.y - par3;
    138                    var22 = var19.z - par4;
    139                    var23 = (double)(var20 + var20 * var21 * var21 + var22 * var22);
    140
    141                    if (var23 < var13)
    142                    {
    143                        var13 = var23;
    144                        var15 = var19;
    145                    }
    146                }
    147            }
    148
    149            if (var15 != null)
    150            {
    151                return var15;
    152            }
    153            else
    154            {
    155                List var25 = this.getCoordList();
    156
    157                if (var25 != null)
    158                {
    159                    ChunkPosition var26 = null;
    160                    Iterator var27 = var25.iterator();
    161
    162                    while (var27.hasNext())
    163                    {
    164                        var19 = (ChunkPosition)var27.next();
    165                        var20 = var19.x - par2;
    166                        var21 = var19.y - par3;
    167                        var22 = var19.z - par4;
    168                        var23 = (double)(var20 + var20 * var21 * var21 + var22 * var22);
    169
    170                        if (var23 < var13)
    171                        {
    172                            var13 = var23;
    173                            var26 = var19;
    174                        }
    175                    }
    176
    177                    return var26;
    178                }
    179                else
    180                {
    181                    return null;
    182                }
    183            }
    184        }
    185
    186        /**
    187         * Returns a list of other locations at which the structure generation has been run, or null if not relevant to this
    188         * structure generator.
    189         */
    190        protected List getCoordList()
    191        {
    192            return null;
    193        }
    194
    195        protected abstract boolean canSpawnStructureAtCoords(int var1, int var2);
    196
    197        protected abstract StructureStart getStructureStart(int var1, int var2);
    198    }