001package net.minecraft.world.storage;
002
003import java.util.Iterator;
004import net.minecraft.entity.player.EntityPlayer;
005import net.minecraft.item.ItemStack;
006
007public class MapInfo
008{
009    /** Reference for EntityPlayer object in MapInfo */
010    public final EntityPlayer entityplayerObj;
011    public int[] field_76209_b;
012    public int[] field_76210_c;
013
014    /**
015     * updated by x = mod(x*11,128) +1  x-1 is used to index field_76209_b and field_76210_c
016     */
017    private int currentRandomNumber;
018    private int ticksUntilPlayerLocationMapUpdate;
019
020    /**
021     * a cache of the result from getPlayersOnMap so that it is not resent when nothing changes
022     */
023    private byte[] lastPlayerLocationOnMap;
024    public int field_82569_d;
025    private boolean field_82570_i;
026
027    /** reference in MapInfo to MapData object */
028    final MapData mapDataObj;
029
030    public MapInfo(MapData par1MapData, EntityPlayer par2EntityPlayer)
031    {
032        this.mapDataObj = par1MapData;
033        this.field_76209_b = new int[128];
034        this.field_76210_c = new int[128];
035        this.currentRandomNumber = 0;
036        this.ticksUntilPlayerLocationMapUpdate = 0;
037        this.field_82570_i = false;
038        this.entityplayerObj = par2EntityPlayer;
039
040        for (int var3 = 0; var3 < this.field_76209_b.length; ++var3)
041        {
042            this.field_76209_b[var3] = 0;
043            this.field_76210_c[var3] = 127;
044        }
045    }
046
047    /**
048     * returns a 1+players*3 array, of x,y, and color . the name of this function may be partially wrong, as there is a
049     * second branch to the code here
050     */
051    public byte[] getPlayersOnMap(ItemStack par1ItemStack)
052    {
053        byte[] var2;
054
055        if (!this.field_82570_i)
056        {
057            var2 = new byte[] {(byte)2, this.mapDataObj.scale};
058            this.field_82570_i = true;
059            return var2;
060        }
061        else
062        {
063            int var3;
064            int var10;
065
066            if (--this.ticksUntilPlayerLocationMapUpdate < 0)
067            {
068                this.ticksUntilPlayerLocationMapUpdate = 4;
069                var2 = new byte[this.mapDataObj.playersVisibleOnMap.size() * 3 + 1];
070                var2[0] = 1;
071                var3 = 0;
072
073                for (Iterator var4 = this.mapDataObj.playersVisibleOnMap.values().iterator(); var4.hasNext(); ++var3)
074                {
075                    MapCoord var5 = (MapCoord)var4.next();
076                    var2[var3 * 3 + 1] = (byte)(var5.iconSize << 4 | var5.iconRotation & 15);
077                    var2[var3 * 3 + 2] = var5.centerX;
078                    var2[var3 * 3 + 3] = var5.centerZ;
079                }
080
081                boolean var9 = !par1ItemStack.isOnItemFrame();
082
083                if (this.lastPlayerLocationOnMap != null && this.lastPlayerLocationOnMap.length == var2.length)
084                {
085                    for (var10 = 0; var10 < var2.length; ++var10)
086                    {
087                        if (var2[var10] != this.lastPlayerLocationOnMap[var10])
088                        {
089                            var9 = false;
090                            break;
091                        }
092                    }
093                }
094                else
095                {
096                    var9 = false;
097                }
098
099                if (!var9)
100                {
101                    this.lastPlayerLocationOnMap = var2;
102                    return var2;
103                }
104            }
105
106            for (int var8 = 0; var8 < 1; ++var8)
107            {
108                var3 = this.currentRandomNumber++ * 11 % 128;
109
110                if (this.field_76209_b[var3] >= 0)
111                {
112                    int var11 = this.field_76210_c[var3] - this.field_76209_b[var3] + 1;
113                    var10 = this.field_76209_b[var3];
114                    byte[] var6 = new byte[var11 + 3];
115                    var6[0] = 0;
116                    var6[1] = (byte)var3;
117                    var6[2] = (byte)var10;
118
119                    for (int var7 = 0; var7 < var6.length - 3; ++var7)
120                    {
121                        var6[var7 + 3] = this.mapDataObj.colors[(var7 + var10) * 128 + var3];
122                    }
123
124                    this.field_76210_c[var3] = -1;
125                    this.field_76209_b[var3] = -1;
126                    return var6;
127                }
128            }
129
130            return null;
131        }
132    }
133}