    001package net.minecraft.world.gen;
    002
    003import java.util.Random;
    004import net.minecraft.block.Block;
    005import net.minecraft.util.MathHelper;
    006import net.minecraft.world.World;
    007
    008public class MapGenRavine extends MapGenBase
    009{
    010    private float[] field_75046_d = new float[1024];
    011
    012    protected void generateRavine(long par1, int par3, int par4, byte[] par5ArrayOfByte, double par6, double par8, double par10, float par12, float par13, float par14, int par15, int par16, double par17)
    013    {
    014        Random random = new Random(par1);
    015        double d4 = (double)(par3 * 16 + 8);
    016        double d5 = (double)(par4 * 16 + 8);
    017        float f3 = 0.0F;
    018        float f4 = 0.0F;
    019
    020        if (par16 <= 0)
    021        {
    022            int j1 = this.range * 16 - 16;
    023            par16 = j1 - random.nextInt(j1 / 4);
    024        }
    025
    026        boolean flag = false;
    027
    028        if (par15 == -1)
    029        {
    030            par15 = par16 / 2;
    031            flag = true;
    032        }
    033
    034        float f5 = 1.0F;
    035
    036        for (int k1 = 0; k1 < 128; ++k1)
    037        {
    038            if (k1 == 0 || random.nextInt(3) == 0)
    039            {
    040                f5 = 1.0F + random.nextFloat() * random.nextFloat() * 1.0F;
    041            }
    042
    043            this.field_75046_d[k1] = f5 * f5;
    044        }
    045
    046        for (; par15 < par16; ++par15)
    047        {
    048            double d6 = 1.5D + (double)(MathHelper.sin((float)par15 * (float)Math.PI / (float)par16) * par12 * 1.0F);
    049            double d7 = d6 * par17;
    050            d6 *= (double)random.nextFloat() * 0.25D + 0.75D;
    051            d7 *= (double)random.nextFloat() * 0.25D + 0.75D;
    052            float f6 = MathHelper.cos(par14);
    053            float f7 = MathHelper.sin(par14);
    054            par6 += (double)(MathHelper.cos(par13) * f6);
    055            par8 += (double)f7;
    056            par10 += (double)(MathHelper.sin(par13) * f6);
    057            par14 *= 0.7F;
    058            par14 += f4 * 0.05F;
    059            par13 += f3 * 0.05F;
    060            f4 *= 0.8F;
    061            f3 *= 0.5F;
    062            f4 += (random.nextFloat() - random.nextFloat()) * random.nextFloat() * 2.0F;
    063            f3 += (random.nextFloat() - random.nextFloat()) * random.nextFloat() * 4.0F;
    064
    065            if (flag || random.nextInt(4) != 0)
    066            {
    067                double d8 = par6 - d4;
    068                double d9 = par10 - d5;
    069                double d10 = (double)(par16 - par15);
    070                double d11 = (double)(par12 + 2.0F + 16.0F);
    071
    072                if (d8 * d8 + d9 * d9 - d10 * d10 > d11 * d11)
    073                {
    074                    return;
    075                }
    076
    077                if (par6 >= d4 - 16.0D - d6 * 2.0D && par10 >= d5 - 16.0D - d6 * 2.0D && par6 <= d4 + 16.0D + d6 * 2.0D && par10 <= d5 + 16.0D + d6 * 2.0D)
    078                {
    079                    int l1 = MathHelper.floor_double(par6 - d6) - par3 * 16 - 1;
    080                    int i2 = MathHelper.floor_double(par6 + d6) - par3 * 16 + 1;
    081                    int j2 = MathHelper.floor_double(par8 - d7) - 1;
    082                    int k2 = MathHelper.floor_double(par8 + d7) + 1;
    083                    int l2 = MathHelper.floor_double(par10 - d6) - par4 * 16 - 1;
    084                    int i3 = MathHelper.floor_double(par10 + d6) - par4 * 16 + 1;
    085
    086                    if (l1 < 0)
    087                    {
    088                        l1 = 0;
    089                    }
    090
    091                    if (i2 > 16)
    092                    {
    093                        i2 = 16;
    094                    }
    095
    096                    if (j2 < 1)
    097                    {
    098                        j2 = 1;
    099                    }
    100
    101                    if (k2 > 120)
    102                    {
    103                        k2 = 120;
    104                    }
    105
    106                    if (l2 < 0)
    107                    {
    108                        l2 = 0;
    109                    }
    110
    111                    if (i3 > 16)
    112                    {
    113                        i3 = 16;
    114                    }
    115
    116                    boolean flag1 = false;
    117                    int j3;
    118                    int k3;
    119
    120                    for (j3 = l1; !flag1 && j3 < i2; ++j3)
    121                    {
    122                        for (int l3 = l2; !flag1 && l3 < i3; ++l3)
    123                        {
    124                            for (int i4 = k2 + 1; !flag1 && i4 >= j2 - 1; --i4)
    125                            {
    126                                k3 = (j3 * 16 + l3) * 128 + i4;
    127
    128                                if (i4 >= 0 && i4 < 128)
    129                                {
    130                                    if (par5ArrayOfByte[k3] == Block.waterMoving.blockID || par5ArrayOfByte[k3] == Block.waterStill.blockID)
    131                                    {
    132                                        flag1 = true;
    133                                    }
    134
    135                                    if (i4 != j2 - 1 && j3 != l1 && j3 != i2 - 1 && l3 != l2 && l3 != i3 - 1)
    136                                    {
    137                                        i4 = j2;
    138                                    }
    139                                }
    140                            }
    141                        }
    142                    }
    143
    144                    if (!flag1)
    145                    {
    146                        for (j3 = l1; j3 < i2; ++j3)
    147                        {
    148                            double d12 = ((double)(j3 + par3 * 16) + 0.5D - par6) / d6;
    149
    150                            for (k3 = l2; k3 < i3; ++k3)
    151                            {
    152                                double d13 = ((double)(k3 + par4 * 16) + 0.5D - par10) / d6;
    153                                int j4 = (j3 * 16 + k3) * 128 + k2;
    154                                boolean flag2 = false;
    155
    156                                if (d12 * d12 + d13 * d13 < 1.0D)
    157                                {
    158                                    for (int k4 = k2 - 1; k4 >= j2; --k4)
    159                                    {
    160                                        double d14 = ((double)k4 + 0.5D - par8) / d7;
    161
    162                                        if ((d12 * d12 + d13 * d13) * (double)this.field_75046_d[k4] + d14 * d14 / 6.0D < 1.0D)
    163                                        {
    164                                            byte b0 = par5ArrayOfByte[j4];
    165
    166                                            if (b0 == Block.grass.blockID)
    167                                            {
    168                                                flag2 = true;
    169                                            }
    170
    171                                            if (b0 == Block.stone.blockID || b0 == Block.dirt.blockID || b0 == Block.grass.blockID)
    172                                            {
    173                                                if (k4 < 10)
    174                                                {
    175                                                    par5ArrayOfByte[j4] = (byte)Block.lavaMoving.blockID;
    176                                                }
    177                                                else
    178                                                {
    179                                                    par5ArrayOfByte[j4] = 0;
    180
    181                                                    if (flag2 && par5ArrayOfByte[j4 - 1] == Block.dirt.blockID)
    182                                                    {
    183                                                        par5ArrayOfByte[j4 - 1] = this.worldObj.getBiomeGenForCoords(j3 + par3 * 16, k3 + par4 * 16).topBlock;
    184                                                    }
    185                                                }
    186                                            }
    187                                        }
    188
    189                                        --j4;
    190                                    }
    191                                }
    192                            }
    193                        }
    194
    195                        if (flag)
    196                        {
    197                            break;
    198                        }
    199                    }
    200                }
    201            }
    202        }
    203    }
    204
    205    /**
    206     * Recursively called by generate() (generate) and optionally by itself.
    207     */
    208    protected void recursiveGenerate(World par1World, int par2, int par3, int par4, int par5, byte[] par6ArrayOfByte)
    209    {
    210        if (this.rand.nextInt(50) == 0)
    211        {
    212            double d0 = (double)(par2 * 16 + this.rand.nextInt(16));
    213            double d1 = (double)(this.rand.nextInt(this.rand.nextInt(40) + 8) + 20);
    214            double d2 = (double)(par3 * 16 + this.rand.nextInt(16));
    215            byte b0 = 1;
    216
    217            for (int i1 = 0; i1 < b0; ++i1)
    218            {
    219                float f = this.rand.nextFloat() * (float)Math.PI * 2.0F;
    220                float f1 = (this.rand.nextFloat() - 0.5F) * 2.0F / 8.0F;
    221                float f2 = (this.rand.nextFloat() * 2.0F + this.rand.nextFloat()) * 2.0F;
    222                this.generateRavine(this.rand.nextLong(), par4, par5, par6ArrayOfByte, d0, d1, d2, f2, f, f1, 0, 0, 3.0D);
    223            }
    224        }
    225    }
    226}