001    package net.minecraft.world;
002    
003    import java.util.ArrayList;
004    import java.util.HashMap;
005    import java.util.HashSet;
006    import java.util.Iterator;
007    import java.util.List;
008    import java.util.Map;
009    import java.util.Random;
010    import net.minecraft.block.Block;
011    import net.minecraft.entity.Entity;
012    import net.minecraft.entity.player.EntityPlayer;
013    import net.minecraft.util.AxisAlignedBB;
014    import net.minecraft.util.DamageSource;
015    import net.minecraft.util.MathHelper;
016    import net.minecraft.util.Vec3;
017    
018    public class Explosion
019    {
020        /** whether or not the explosion sets fire to blocks around it */
021        public boolean isFlaming = false;
022    
023        /** whether or not this explosion spawns smoke particles */
024        public boolean isSmoking = true;
025        private int field_77289_h = 16;
026        private Random explosionRNG = new Random();
027        private World worldObj;
028        public double explosionX;
029        public double explosionY;
030        public double explosionZ;
031        public Entity exploder;
032        public float explosionSize;
033    
034        /** A list of ChunkPositions of blocks affected by this explosion */
035        public List affectedBlockPositions = new ArrayList();
036        private Map field_77288_k = new HashMap();
037    
038        public Explosion(World par1World, Entity par2Entity, double par3, double par5, double par7, float par9)
039        {
040            this.worldObj = par1World;
041            this.exploder = par2Entity;
042            this.explosionSize = par9;
043            this.explosionX = par3;
044            this.explosionY = par5;
045            this.explosionZ = par7;
046        }
047    
048        /**
049         * Does the first part of the explosion (destroy blocks)
050         */
051        public void doExplosionA()
052        {
053            float var1 = this.explosionSize;
054            HashSet var2 = new HashSet();
055            int var3;
056            int var4;
057            int var5;
058            double var15;
059            double var17;
060            double var19;
061    
062            for (var3 = 0; var3 < this.field_77289_h; ++var3)
063            {
064                for (var4 = 0; var4 < this.field_77289_h; ++var4)
065                {
066                    for (var5 = 0; var5 < this.field_77289_h; ++var5)
067                    {
068                        if (var3 == 0 || var3 == this.field_77289_h - 1 || var4 == 0 || var4 == this.field_77289_h - 1 || var5 == 0 || var5 == this.field_77289_h - 1)
069                        {
070                            double var6 = (double)((float)var3 / ((float)this.field_77289_h - 1.0F) * 2.0F - 1.0F);
071                            double var8 = (double)((float)var4 / ((float)this.field_77289_h - 1.0F) * 2.0F - 1.0F);
072                            double var10 = (double)((float)var5 / ((float)this.field_77289_h - 1.0F) * 2.0F - 1.0F);
073                            double var12 = Math.sqrt(var6 * var6 + var8 * var8 + var10 * var10);
074                            var6 /= var12;
075                            var8 /= var12;
076                            var10 /= var12;
077                            float var14 = this.explosionSize * (0.7F + this.worldObj.rand.nextFloat() * 0.6F);
078                            var15 = this.explosionX;
079                            var17 = this.explosionY;
080                            var19 = this.explosionZ;
081    
082                            for (float var21 = 0.3F; var14 > 0.0F; var14 -= var21 * 0.75F)
083                            {
084                                int var22 = MathHelper.floor_double(var15);
085                                int var23 = MathHelper.floor_double(var17);
086                                int var24 = MathHelper.floor_double(var19);
087                                int var25 = this.worldObj.getBlockId(var22, var23, var24);
088    
089                                if (var25 > 0)
090                                {
091                                    Block var26 = Block.blocksList[var25];
092                                    float var27 = this.exploder != null ? this.exploder.func_82146_a(this, var26, var22, var23, var24) : var26.getExplosionResistance(this.exploder, worldObj, var22, var23, var24, explosionX, explosionY, explosionZ);
093                                    var14 -= (var27 + 0.3F) * var21;
094                                }
095    
096                                if (var14 > 0.0F)
097                                {
098                                    var2.add(new ChunkPosition(var22, var23, var24));
099                                }
100    
101                                var15 += var6 * (double)var21;
102                                var17 += var8 * (double)var21;
103                                var19 += var10 * (double)var21;
104                            }
105                        }
106                    }
107                }
108            }
109    
110            this.affectedBlockPositions.addAll(var2);
111            this.explosionSize *= 2.0F;
112            var3 = MathHelper.floor_double(this.explosionX - (double)this.explosionSize - 1.0D);
113            var4 = MathHelper.floor_double(this.explosionX + (double)this.explosionSize + 1.0D);
114            var5 = MathHelper.floor_double(this.explosionY - (double)this.explosionSize - 1.0D);
115            int var28 = MathHelper.floor_double(this.explosionY + (double)this.explosionSize + 1.0D);
116            int var7 = MathHelper.floor_double(this.explosionZ - (double)this.explosionSize - 1.0D);
117            int var29 = MathHelper.floor_double(this.explosionZ + (double)this.explosionSize + 1.0D);
118            List var9 = this.worldObj.getEntitiesWithinAABBExcludingEntity(this.exploder, AxisAlignedBB.getAABBPool().addOrModifyAABBInPool((double)var3, (double)var5, (double)var7, (double)var4, (double)var28, (double)var29));
119            Vec3 var30 = this.worldObj.getWorldVec3Pool().getVecFromPool(this.explosionX, this.explosionY, this.explosionZ);
120    
121            for (int var11 = 0; var11 < var9.size(); ++var11)
122            {
123                Entity var31 = (Entity)var9.get(var11);
124                double var13 = var31.getDistance(this.explosionX, this.explosionY, this.explosionZ) / (double)this.explosionSize;
125    
126                if (var13 <= 1.0D)
127                {
128                    var15 = var31.posX - this.explosionX;
129                    var17 = var31.posY + (double)var31.getEyeHeight() - this.explosionY;
130                    var19 = var31.posZ - this.explosionZ;
131                    double var33 = (double)MathHelper.sqrt_double(var15 * var15 + var17 * var17 + var19 * var19);
132    
133                    if (var33 != 0.0D)
134                    {
135                        var15 /= var33;
136                        var17 /= var33;
137                        var19 /= var33;
138                        double var32 = (double)this.worldObj.getBlockDensity(var30, var31.boundingBox);
139                        double var34 = (1.0D - var13) * var32;
140                        var31.attackEntityFrom(DamageSource.explosion, (int)((var34 * var34 + var34) / 2.0D * 8.0D * (double)this.explosionSize + 1.0D));
141                        var31.motionX += var15 * var34;
142                        var31.motionY += var17 * var34;
143                        var31.motionZ += var19 * var34;
144    
145                        if (var31 instanceof EntityPlayer)
146                        {
147                            this.field_77288_k.put((EntityPlayer)var31, this.worldObj.getWorldVec3Pool().getVecFromPool(var15 * var34, var17 * var34, var19 * var34));
148                        }
149                    }
150                }
151            }
152    
153            this.explosionSize = var1;
154        }
155    
156        /**
157         * Does the second part of the explosion (sound, particles, drop spawn)
158         */
159        public void doExplosionB(boolean par1)
160        {
161            this.worldObj.playSoundEffect(this.explosionX, this.explosionY, this.explosionZ, "random.explode", 4.0F, (1.0F + (this.worldObj.rand.nextFloat() - this.worldObj.rand.nextFloat()) * 0.2F) * 0.7F);
162    
163            if (this.explosionSize >= 2.0F && this.isSmoking)
164            {
165                this.worldObj.spawnParticle("hugeexplosion", this.explosionX, this.explosionY, this.explosionZ, 1.0D, 0.0D, 0.0D);
166            }
167            else
168            {
169                this.worldObj.spawnParticle("largeexplode", this.explosionX, this.explosionY, this.explosionZ, 1.0D, 0.0D, 0.0D);
170            }
171    
172            Iterator var2;
173            ChunkPosition var3;
174            int var4;
175            int var5;
176            int var6;
177            int var7;
178    
179            if (this.isSmoking)
180            {
181                var2 = this.affectedBlockPositions.iterator();
182    
183                while (var2.hasNext())
184                {
185                    var3 = (ChunkPosition)var2.next();
186                    var4 = var3.x;
187                    var5 = var3.y;
188                    var6 = var3.z;
189                    var7 = this.worldObj.getBlockId(var4, var5, var6);
190    
191                    if (par1)
192                    {
193                        double var8 = (double)((float)var4 + this.worldObj.rand.nextFloat());
194                        double var10 = (double)((float)var5 + this.worldObj.rand.nextFloat());
195                        double var12 = (double)((float)var6 + this.worldObj.rand.nextFloat());
196                        double var14 = var8 - this.explosionX;
197                        double var16 = var10 - this.explosionY;
198                        double var18 = var12 - this.explosionZ;
199                        double var20 = (double)MathHelper.sqrt_double(var14 * var14 + var16 * var16 + var18 * var18);
200                        var14 /= var20;
201                        var16 /= var20;
202                        var18 /= var20;
203                        double var22 = 0.5D / (var20 / (double)this.explosionSize + 0.1D);
204                        var22 *= (double)(this.worldObj.rand.nextFloat() * this.worldObj.rand.nextFloat() + 0.3F);
205                        var14 *= var22;
206                        var16 *= var22;
207                        var18 *= var22;
208                        this.worldObj.spawnParticle("explode", (var8 + this.explosionX * 1.0D) / 2.0D, (var10 + this.explosionY * 1.0D) / 2.0D, (var12 + this.explosionZ * 1.0D) / 2.0D, var14, var16, var18);
209                        this.worldObj.spawnParticle("smoke", var8, var10, var12, var14, var16, var18);
210                    }
211    
212                    if (var7 > 0)
213                    {
214                        Block var25 = Block.blocksList[var7];
215    
216                        if (var25.func_85103_a(this))
217                        {
218                            var25.dropBlockAsItemWithChance(this.worldObj, var4, var5, var6, this.worldObj.getBlockMetadata(var4, var5, var6), 0.3F, 0);
219                        }
220    
221                        if (this.worldObj.setBlockAndMetadataWithUpdate(var4, var5, var6, 0, 0, this.worldObj.isRemote))
222                        {
223                            this.worldObj.notifyBlocksOfNeighborChange(var4, var5, var6, 0);
224                        }
225    
226                        var25.onBlockDestroyedByExplosion(this.worldObj, var4, var5, var6);
227                    }
228                }
229            }
230    
231            if (this.isFlaming)
232            {
233                var2 = this.affectedBlockPositions.iterator();
234    
235                while (var2.hasNext())
236                {
237                    var3 = (ChunkPosition)var2.next();
238                    var4 = var3.x;
239                    var5 = var3.y;
240                    var6 = var3.z;
241                    var7 = this.worldObj.getBlockId(var4, var5, var6);
242                    int var24 = this.worldObj.getBlockId(var4, var5 - 1, var6);
243    
244                    if (var7 == 0 && Block.opaqueCubeLookup[var24] && this.explosionRNG.nextInt(3) == 0)
245                    {
246                        this.worldObj.setBlockWithNotify(var4, var5, var6, Block.fire.blockID);
247                    }
248                }
249            }
250        }
251    
252        public Map func_77277_b()
253        {
254            return this.field_77288_k;
255        }
256    }