content: package net.minecraft.world.gen;
  
  import net.minecraft.block.state.IBlockState;
  import net.minecraft.init.Blocks;
  import net.minecraft.util.BlockPos;
  import net.minecraft.util.MathHelper;
  import net.minecraft.world.World;
  import net.minecraft.world.chunk.ChunkPrimer;
  
  import java.util.Random;
  
  public class MapGenRavine extends MapGenBase {
      private final float[] field_75046_d = new float[1024];
  
      protected void func_180707_a(long p_180707_1_, int p_180707_3_, int p_180707_4_, ChunkPrimer p_180707_5_, double p_180707_6_, double p_180707_8_, double p_180707_10_, float p_180707_12_, float p_180707_13_, float p_180707_14_, int p_180707_15_, int p_180707_16_, double p_180707_17_) {
          Random random = new Random(p_180707_1_);
          double d0 = p_180707_3_ * 16 + 8;
          double d1 = p_180707_4_ * 16 + 8;
          float f = 0.0F;
          float f1 = 0.0F;
  
          if (p_180707_16_ <= 0) {
              int i = this.range * 16 - 16;
              p_180707_16_ = i - random.nextInt(i / 4);
          }
  
          boolean flag1 = false;
  
          if (p_180707_15_ == -1) {
              p_180707_15_ = p_180707_16_ / 2;
              flag1 = true;
          }
  
          float f2 = 1.0F;
  
          for (int j = 0; j < 256; ++j) {
              if (j == 0 || random.nextInt(3) == 0) {
                  f2 = 1.0F + random.nextFloat() * random.nextFloat() * 1.0F;
              }
  
              this.field_75046_d[j] = f2 * f2;
          }
  
          for (; p_180707_15_ < p_180707_16_; ++p_180707_15_) {
              double d9 = 1.5D + (double) (MathHelper.sin((float) p_180707_15_ * (float) Math.PI / (float) p_180707_16_) * p_180707_12_ * 1.0F);
              double d2 = d9 * p_180707_17_;
              d9 = d9 * ((double) random.nextFloat() * 0.25D + 0.75D);
              d2 = d2 * ((double) random.nextFloat() * 0.25D + 0.75D);
              float f3 = MathHelper.cos(p_180707_14_);
              float f4 = MathHelper.sin(p_180707_14_);
              p_180707_6_ += MathHelper.cos(p_180707_13_) * f3;
              p_180707_8_ += f4;
              p_180707_10_ += MathHelper.sin(p_180707_13_) * f3;
              p_180707_14_ = p_180707_14_ * 0.7F;
              p_180707_14_ = p_180707_14_ + f1 * 0.05F;
              p_180707_13_ += f * 0.05F;
              f1 = f1 * 0.8F;
              f = f * 0.5F;
              f1 = f1 + (random.nextFloat() - random.nextFloat()) * random.nextFloat() * 2.0F;
              f = f + (random.nextFloat() - random.nextFloat()) * random.nextFloat() * 4.0F;
  
              if (flag1 || random.nextInt(4) != 0) {
                  double d3 = p_180707_6_ - d0;
                  double d4 = p_180707_10_ - d1;
                  double d5 = p_180707_16_ - p_180707_15_;
                  double d6 = p_180707_12_ + 2.0F + 16.0F;
  
                  if (d3 * d3 + d4 * d4 - d5 * d5 > d6 * d6) {
                      return;
                  }
  
                  if (p_180707_6_ >= d0 - 16.0D - d9 * 2.0D && p_180707_10_ >= d1 - 16.0D - d9 * 2.0D && p_180707_6_ <= d0 + 16.0D + d9 * 2.0D && p_180707_10_ <= d1 + 16.0D + d9 * 2.0D) {
                      int k2 = MathHelper.floor_double(p_180707_6_ - d9) - p_180707_3_ * 16 - 1;
                      int k = MathHelper.floor_double(p_180707_6_ + d9) - p_180707_3_ * 16 + 1;
                      int l2 = MathHelper.floor_double(p_180707_8_ - d2) - 1;
                      int l = MathHelper.floor_double(p_180707_8_ + d2) + 1;
                      int i3 = MathHelper.floor_double(p_180707_10_ - d9) - p_180707_4_ * 16 - 1;
                      int i1 = MathHelper.floor_double(p_180707_10_ + d9) - p_180707_4_ * 16 + 1;
  
                      if (k2 < 0) {
                          k2 = 0;
                      }
  
                      if (k > 16) {
                          k = 16;
                      }
  
                      if (l2 < 1) {
                          l2 = 1;
                      }
  
                      if (l > 248) {
                          l = 248;
                      }
  
                      if (i3 < 0) {
                          i3 = 0;
                      }
  
                      if (i1 > 16) {
                          i1 = 16;
                      }
  
                      boolean flag2 = false;
  
                      for (int j1 = k2; !flag2 && j1 < k; ++j1) {
                          for (int k1 = i3; !flag2 && k1 < i1; ++k1) {
                              for (int l1 = l + 1; !flag2 && l1 >= l2 - 1; --l1) {
                                  if (l1 >= 0 && l1 < 256) {
                                      IBlockState iblockstate = p_180707_5_.getBlockState(j1, l1, k1);
  
                                      if (iblockstate.getBlock() == Blocks.flowing_water || iblockstate.getBlock() == Blocks.water) {
                                          flag2 = true;
                                      }
  
                                      if (l1 != l2 - 1 && j1 != k2 && j1 != k - 1 && k1 != i3 && k1 != i1 - 1) {
                                          l1 = l2;
                                      }
                                  }
                              }
                          }
                      }
  
                      if (!flag2) {
                          BlockPos.MutableBlockPos blockpos$mutableblockpos = new BlockPos.MutableBlockPos();
  
                          for (int j3 = k2; j3 < k; ++j3) {
                              double d10 = ((double) (j3 + p_180707_3_ * 16) + 0.5D - p_180707_6_) / d9;
  
                              for (int i2 = i3; i2 < i1; ++i2) {
                                  double d7 = ((double) (i2 + p_180707_4_ * 16) + 0.5D - p_180707_10_) / d9;
                                  boolean flag = false;
  
                                  if (d10 * d10 + d7 * d7 < 1.0D) {
                                      for (int j2 = l; j2 > l2; --j2) {
                                          double d8 = ((double) (j2 - 1) + 0.5D - p_180707_8_) / d2;
  
                                          if ((d10 * d10 + d7 * d7) * (double) this.field_75046_d[j2 - 1] + d8 * d8 / 6.0D < 1.0D) {
                                              IBlockState iblockstate1 = p_180707_5_.getBlockState(j3, j2, i2);
  
                                              if (iblockstate1.getBlock() == Blocks.grass) {
                                                  flag = true;
                                              }
  
                                              if (iblockstate1.getBlock() == Blocks.stone || iblockstate1.getBlock() == Blocks.dirt || iblockstate1.getBlock() == Blocks.grass) {
                                                  if (j2 - 1 < 10) {
                                                      p_180707_5_.setBlockState(j3, j2, i2, Blocks.flowing_lava.getDefaultState());
                                                  } else {
                                                      p_180707_5_.setBlockState(j3, j2, i2, Blocks.air.getDefaultState());
  
                                                      if (flag && p_180707_5_.getBlockState(j3, j2 - 1, i2).getBlock() == Blocks.dirt) {
                                                          blockpos$mutableblockpos.set(j3 + p_180707_3_ * 16, 0, i2 + p_180707_4_ * 16);
                                                          p_180707_5_.setBlockState(j3, j2 - 1, i2, this.worldObj.getBiomeGenForCoords(blockpos$mutableblockpos).topBlock);
                                                      }
                                                  }
                                              }
                                          }
                                      }
                                  }
                              }
                          }
  
                          if (flag1) {
                              break;
                          }
                      }
                  }
              }
          }
      }
  
      protected void recursiveGenerate(World worldIn, int chunkX, int chunkZ, int p_180701_4_, int p_180701_5_, ChunkPrimer chunkPrimerIn) {
          if (this.rand.nextInt(50) == 0) {
              double d0 = chunkX * 16 + this.rand.nextInt(16);
              double d1 = this.rand.nextInt(this.rand.nextInt(40) + 8) + 20;
              double d2 = chunkZ * 16 + this.rand.nextInt(16);
              int i = 1;
  
              for (int j = 0; j < i; ++j) {
                  float f = this.rand.nextFloat() * (float) Math.PI * 2.0F;
                  float f1 = (this.rand.nextFloat() - 0.5F) * 2.0F / 8.0F;
                  float f2 = (this.rand.nextFloat() * 2.0F + this.rand.nextFloat()) * 2.0F;
                  this.func_180707_a(this.rand.nextLong(), p_180701_4_, p_180701_5_, chunkPrimerIn, d0, d1, d2, f2, f, f1, 0, 0, 3.0D);
              }
          }
      }
  }
  