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 MapGenCaves extends MapGenBase
009{
010    /**
011     * Generates a larger initial cave node than usual. Called 25% of the time.
012     */
013    protected void generateLargeCaveNode(long par1, int par3, int par4, byte[] par5ArrayOfByte, double par6, double par8, double par10)
014    {
015        this.generateCaveNode(par1, par3, par4, par5ArrayOfByte, par6, par8, par10, 1.0F + this.rand.nextFloat() * 6.0F, 0.0F, 0.0F, -1, -1, 0.5D);
016    }
017
018    /**
019     * Generates a node in the current cave system recursion tree.
020     */
021    protected void generateCaveNode(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)
022    {
023        double var19 = (double)(par3 * 16 + 8);
024        double var21 = (double)(par4 * 16 + 8);
025        float var23 = 0.0F;
026        float var24 = 0.0F;
027        Random var25 = new Random(par1);
028
029        if (par16 <= 0)
030        {
031            int var26 = this.range * 16 - 16;
032            par16 = var26 - var25.nextInt(var26 / 4);
033        }
034
035        boolean var54 = false;
036
037        if (par15 == -1)
038        {
039            par15 = par16 / 2;
040            var54 = true;
041        }
042
043        int var27 = var25.nextInt(par16 / 2) + par16 / 4;
044
045        for (boolean var28 = var25.nextInt(6) == 0; par15 < par16; ++par15)
046        {
047            double var29 = 1.5D + (double)(MathHelper.sin((float)par15 * (float)Math.PI / (float)par16) * par12 * 1.0F);
048            double var31 = var29 * par17;
049            float var33 = MathHelper.cos(par14);
050            float var34 = MathHelper.sin(par14);
051            par6 += (double)(MathHelper.cos(par13) * var33);
052            par8 += (double)var34;
053            par10 += (double)(MathHelper.sin(par13) * var33);
054
055            if (var28)
056            {
057                par14 *= 0.92F;
058            }
059            else
060            {
061                par14 *= 0.7F;
062            }
063
064            par14 += var24 * 0.1F;
065            par13 += var23 * 0.1F;
066            var24 *= 0.9F;
067            var23 *= 0.75F;
068            var24 += (var25.nextFloat() - var25.nextFloat()) * var25.nextFloat() * 2.0F;
069            var23 += (var25.nextFloat() - var25.nextFloat()) * var25.nextFloat() * 4.0F;
070
071            if (!var54 && par15 == var27 && par12 > 1.0F && par16 > 0)
072            {
073                this.generateCaveNode(var25.nextLong(), par3, par4, par5ArrayOfByte, par6, par8, par10, var25.nextFloat() * 0.5F + 0.5F, par13 - ((float)Math.PI / 2F), par14 / 3.0F, par15, par16, 1.0D);
074                this.generateCaveNode(var25.nextLong(), par3, par4, par5ArrayOfByte, par6, par8, par10, var25.nextFloat() * 0.5F + 0.5F, par13 + ((float)Math.PI / 2F), par14 / 3.0F, par15, par16, 1.0D);
075                return;
076            }
077
078            if (var54 || var25.nextInt(4) != 0)
079            {
080                double var35 = par6 - var19;
081                double var37 = par10 - var21;
082                double var39 = (double)(par16 - par15);
083                double var41 = (double)(par12 + 2.0F + 16.0F);
084
085                if (var35 * var35 + var37 * var37 - var39 * var39 > var41 * var41)
086                {
087                    return;
088                }
089
090                if (par6 >= var19 - 16.0D - var29 * 2.0D && par10 >= var21 - 16.0D - var29 * 2.0D && par6 <= var19 + 16.0D + var29 * 2.0D && par10 <= var21 + 16.0D + var29 * 2.0D)
091                {
092                    int var55 = MathHelper.floor_double(par6 - var29) - par3 * 16 - 1;
093                    int var36 = MathHelper.floor_double(par6 + var29) - par3 * 16 + 1;
094                    int var57 = MathHelper.floor_double(par8 - var31) - 1;
095                    int var38 = MathHelper.floor_double(par8 + var31) + 1;
096                    int var56 = MathHelper.floor_double(par10 - var29) - par4 * 16 - 1;
097                    int var40 = MathHelper.floor_double(par10 + var29) - par4 * 16 + 1;
098
099                    if (var55 < 0)
100                    {
101                        var55 = 0;
102                    }
103
104                    if (var36 > 16)
105                    {
106                        var36 = 16;
107                    }
108
109                    if (var57 < 1)
110                    {
111                        var57 = 1;
112                    }
113
114                    if (var38 > 120)
115                    {
116                        var38 = 120;
117                    }
118
119                    if (var56 < 0)
120                    {
121                        var56 = 0;
122                    }
123
124                    if (var40 > 16)
125                    {
126                        var40 = 16;
127                    }
128
129                    boolean var58 = false;
130                    int var42;
131                    int var45;
132
133                    for (var42 = var55; !var58 && var42 < var36; ++var42)
134                    {
135                        for (int var43 = var56; !var58 && var43 < var40; ++var43)
136                        {
137                            for (int var44 = var38 + 1; !var58 && var44 >= var57 - 1; --var44)
138                            {
139                                var45 = (var42 * 16 + var43) * 128 + var44;
140
141                                if (var44 >= 0 && var44 < 128)
142                                {
143                                    if (par5ArrayOfByte[var45] == Block.waterMoving.blockID || par5ArrayOfByte[var45] == Block.waterStill.blockID)
144                                    {
145                                        var58 = true;
146                                    }
147
148                                    if (var44 != var57 - 1 && var42 != var55 && var42 != var36 - 1 && var43 != var56 && var43 != var40 - 1)
149                                    {
150                                        var44 = var57;
151                                    }
152                                }
153                            }
154                        }
155                    }
156
157                    if (!var58)
158                    {
159                        for (var42 = var55; var42 < var36; ++var42)
160                        {
161                            double var59 = ((double)(var42 + par3 * 16) + 0.5D - par6) / var29;
162
163                            for (var45 = var56; var45 < var40; ++var45)
164                            {
165                                double var46 = ((double)(var45 + par4 * 16) + 0.5D - par10) / var29;
166                                int var48 = (var42 * 16 + var45) * 128 + var38;
167                                boolean var49 = false;
168
169                                if (var59 * var59 + var46 * var46 < 1.0D)
170                                {
171                                    for (int var50 = var38 - 1; var50 >= var57; --var50)
172                                    {
173                                        double var51 = ((double)var50 + 0.5D - par8) / var31;
174
175                                        if (var51 > -0.7D && var59 * var59 + var51 * var51 + var46 * var46 < 1.0D)
176                                        {
177                                            byte var53 = par5ArrayOfByte[var48];
178
179                                            if (var53 == Block.grass.blockID)
180                                            {
181                                                var49 = true;
182                                            }
183
184                                            if (var53 == Block.stone.blockID || var53 == Block.dirt.blockID || var53 == Block.grass.blockID)
185                                            {
186                                                if (var50 < 10)
187                                                {
188                                                    par5ArrayOfByte[var48] = (byte)Block.lavaMoving.blockID;
189                                                }
190                                                else
191                                                {
192                                                    par5ArrayOfByte[var48] = 0;
193
194                                                    if (var49 && par5ArrayOfByte[var48 - 1] == Block.dirt.blockID)
195                                                    {
196                                                        par5ArrayOfByte[var48 - 1] = this.worldObj.getBiomeGenForCoords(var42 + par3 * 16, var45 + par4 * 16).topBlock;
197                                                    }
198                                                }
199                                            }
200                                        }
201
202                                        --var48;
203                                    }
204                                }
205                            }
206                        }
207
208                        if (var54)
209                        {
210                            break;
211                        }
212                    }
213                }
214            }
215        }
216    }
217
218    /**
219     * Recursively called by generate() (generate) and optionally by itself.
220     */
221    protected void recursiveGenerate(World par1World, int par2, int par3, int par4, int par5, byte[] par6ArrayOfByte)
222    {
223        int var7 = this.rand.nextInt(this.rand.nextInt(this.rand.nextInt(40) + 1) + 1);
224
225        if (this.rand.nextInt(15) != 0)
226        {
227            var7 = 0;
228        }
229
230        for (int var8 = 0; var8 < var7; ++var8)
231        {
232            double var9 = (double)(par2 * 16 + this.rand.nextInt(16));
233            double var11 = (double)this.rand.nextInt(this.rand.nextInt(120) + 8);
234            double var13 = (double)(par3 * 16 + this.rand.nextInt(16));
235            int var15 = 1;
236
237            if (this.rand.nextInt(4) == 0)
238            {
239                this.generateLargeCaveNode(this.rand.nextLong(), par4, par5, par6ArrayOfByte, var9, var11, var13);
240                var15 += this.rand.nextInt(4);
241            }
242
243            for (int var16 = 0; var16 < var15; ++var16)
244            {
245                float var17 = this.rand.nextFloat() * (float)Math.PI * 2.0F;
246                float var18 = (this.rand.nextFloat() - 0.5F) * 2.0F / 8.0F;
247                float var19 = this.rand.nextFloat() * 2.0F + this.rand.nextFloat();
248
249                if (this.rand.nextInt(10) == 0)
250                {
251                    var19 *= this.rand.nextFloat() * this.rand.nextFloat() * 3.0F + 1.0F;
252                }
253
254                this.generateCaveNode(this.rand.nextLong(), par4, par5, par6ArrayOfByte, var9, var11, var13, var19, var17, var18, 0, 0, 1.0D);
255            }
256        }
257    }
258}