001    package net.minecraft.src;
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    
011    public class Explosion
012    {
013        /** whether or not the explosion sets fire to blocks around it */
014        public boolean isFlaming = false;
015        public boolean field_82755_b = true;
016        private int field_77289_h = 16;
017        private Random explosionRNG = new Random();
018        private World worldObj;
019        public double explosionX;
020        public double explosionY;
021        public double explosionZ;
022        public Entity exploder;
023        public float explosionSize;
024        public List field_77281_g = new ArrayList();
025        private Map field_77288_k = new HashMap();
026    
027        public Explosion(World par1World, Entity par2Entity, double par3, double par5, double par7, float par9)
028        {
029            this.worldObj = par1World;
030            this.exploder = par2Entity;
031            this.explosionSize = par9;
032            this.explosionX = par3;
033            this.explosionY = par5;
034            this.explosionZ = par7;
035        }
036    
037        /**
038         * Does the first part of the explosion (destroy blocks)
039         */
040        public void doExplosionA()
041        {
042            float var1 = this.explosionSize;
043            HashSet var2 = new HashSet();
044            int var3;
045            int var4;
046            int var5;
047            double var15;
048            double var17;
049            double var19;
050    
051            for (var3 = 0; var3 < this.field_77289_h; ++var3)
052            {
053                for (var4 = 0; var4 < this.field_77289_h; ++var4)
054                {
055                    for (var5 = 0; var5 < this.field_77289_h; ++var5)
056                    {
057                        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)
058                        {
059                            double var6 = (double)((float)var3 / ((float)this.field_77289_h - 1.0F) * 2.0F - 1.0F);
060                            double var8 = (double)((float)var4 / ((float)this.field_77289_h - 1.0F) * 2.0F - 1.0F);
061                            double var10 = (double)((float)var5 / ((float)this.field_77289_h - 1.0F) * 2.0F - 1.0F);
062                            double var12 = Math.sqrt(var6 * var6 + var8 * var8 + var10 * var10);
063                            var6 /= var12;
064                            var8 /= var12;
065                            var10 /= var12;
066                            float var14 = this.explosionSize * (0.7F + this.worldObj.rand.nextFloat() * 0.6F);
067                            var15 = this.explosionX;
068                            var17 = this.explosionY;
069                            var19 = this.explosionZ;
070    
071                            for (float var21 = 0.3F; var14 > 0.0F; var14 -= var21 * 0.75F)
072                            {
073                                int var22 = MathHelper.floor_double(var15);
074                                int var23 = MathHelper.floor_double(var17);
075                                int var24 = MathHelper.floor_double(var19);
076                                int var25 = this.worldObj.getBlockId(var22, var23, var24);
077    
078                                if (var25 > 0)
079                                {
080                                    Block var26 = Block.blocksList[var25];
081                                    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);
082                                    var14 -= (var27 + 0.3F) * var21;
083                                }
084    
085                                if (var14 > 0.0F)
086                                {
087                                    var2.add(new ChunkPosition(var22, var23, var24));
088                                }
089    
090                                var15 += var6 * (double)var21;
091                                var17 += var8 * (double)var21;
092                                var19 += var10 * (double)var21;
093                            }
094                        }
095                    }
096                }
097            }
098    
099            this.field_77281_g.addAll(var2);
100            this.explosionSize *= 2.0F;
101            var3 = MathHelper.floor_double(this.explosionX - (double)this.explosionSize - 1.0D);
102            var4 = MathHelper.floor_double(this.explosionX + (double)this.explosionSize + 1.0D);
103            var5 = MathHelper.floor_double(this.explosionY - (double)this.explosionSize - 1.0D);
104            int var28 = MathHelper.floor_double(this.explosionY + (double)this.explosionSize + 1.0D);
105            int var7 = MathHelper.floor_double(this.explosionZ - (double)this.explosionSize - 1.0D);
106            int var29 = MathHelper.floor_double(this.explosionZ + (double)this.explosionSize + 1.0D);
107            List var9 = this.worldObj.getEntitiesWithinAABBExcludingEntity(this.exploder, AxisAlignedBB.getAABBPool().addOrModifyAABBInPool((double)var3, (double)var5, (double)var7, (double)var4, (double)var28, (double)var29));
108            Vec3 var30 = this.worldObj.func_82732_R().getVecFromPool(this.explosionX, this.explosionY, this.explosionZ);
109    
110            for (int var11 = 0; var11 < var9.size(); ++var11)
111            {
112                Entity var31 = (Entity)var9.get(var11);
113                double var13 = var31.getDistance(this.explosionX, this.explosionY, this.explosionZ) / (double)this.explosionSize;
114    
115                if (var13 <= 1.0D)
116                {
117                    var15 = var31.posX - this.explosionX;
118                    var17 = var31.posY + (double)var31.getEyeHeight() - this.explosionY;
119                    var19 = var31.posZ - this.explosionZ;
120                    double var33 = (double)MathHelper.sqrt_double(var15 * var15 + var17 * var17 + var19 * var19);
121    
122                    if (var33 != 0.0D)
123                    {
124                        var15 /= var33;
125                        var17 /= var33;
126                        var19 /= var33;
127                        double var32 = (double)this.worldObj.getBlockDensity(var30, var31.boundingBox);
128                        double var34 = (1.0D - var13) * var32;
129                        var31.attackEntityFrom(DamageSource.explosion, (int)((var34 * var34 + var34) / 2.0D * 8.0D * (double)this.explosionSize + 1.0D));
130                        var31.motionX += var15 * var34;
131                        var31.motionY += var17 * var34;
132                        var31.motionZ += var19 * var34;
133    
134                        if (var31 instanceof EntityPlayer)
135                        {
136                            this.field_77288_k.put((EntityPlayer)var31, this.worldObj.func_82732_R().getVecFromPool(var15 * var34, var17 * var34, var19 * var34));
137                        }
138                    }
139                }
140            }
141    
142            this.explosionSize = var1;
143        }
144    
145        /**
146         * Does the second part of the explosion (sound, particles, drop spawn)
147         */
148        public void doExplosionB(boolean par1)
149        {
150            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);
151    
152            if (this.explosionSize >= 2.0F && this.field_82755_b)
153            {
154                this.worldObj.spawnParticle("hugeexplosion", this.explosionX, this.explosionY, this.explosionZ, 1.0D, 0.0D, 0.0D);
155            }
156            else
157            {
158                this.worldObj.spawnParticle("largeexplode", this.explosionX, this.explosionY, this.explosionZ, 1.0D, 0.0D, 0.0D);
159            }
160    
161            Iterator var2;
162            ChunkPosition var3;
163            int var4;
164            int var5;
165            int var6;
166            int var7;
167    
168            if (this.field_82755_b)
169            {
170                var2 = this.field_77281_g.iterator();
171    
172                while (var2.hasNext())
173                {
174                    var3 = (ChunkPosition)var2.next();
175                    var4 = var3.x;
176                    var5 = var3.y;
177                    var6 = var3.z;
178                    var7 = this.worldObj.getBlockId(var4, var5, var6);
179    
180                    if (par1)
181                    {
182                        double var8 = (double)((float)var4 + this.worldObj.rand.nextFloat());
183                        double var10 = (double)((float)var5 + this.worldObj.rand.nextFloat());
184                        double var12 = (double)((float)var6 + this.worldObj.rand.nextFloat());
185                        double var14 = var8 - this.explosionX;
186                        double var16 = var10 - this.explosionY;
187                        double var18 = var12 - this.explosionZ;
188                        double var20 = (double)MathHelper.sqrt_double(var14 * var14 + var16 * var16 + var18 * var18);
189                        var14 /= var20;
190                        var16 /= var20;
191                        var18 /= var20;
192                        double var22 = 0.5D / (var20 / (double)this.explosionSize + 0.1D);
193                        var22 *= (double)(this.worldObj.rand.nextFloat() * this.worldObj.rand.nextFloat() + 0.3F);
194                        var14 *= var22;
195                        var16 *= var22;
196                        var18 *= var22;
197                        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);
198                        this.worldObj.spawnParticle("smoke", var8, var10, var12, var14, var16, var18);
199                    }
200    
201                    if (var7 > 0)
202                    {
203                        Block.blocksList[var7].dropBlockAsItemWithChance(this.worldObj, var4, var5, var6, this.worldObj.getBlockMetadata(var4, var5, var6), 0.3F, 0);
204    
205                        if (this.worldObj.setBlockAndMetadataWithUpdate(var4, var5, var6, 0, 0, this.worldObj.isRemote))
206                        {
207                            this.worldObj.notifyBlocksOfNeighborChange(var4, var5, var6, 0);
208                        }
209    
210                        Block.blocksList[var7].onBlockDestroyedByExplosion(this.worldObj, var4, var5, var6);
211                    }
212                }
213            }
214    
215            if (this.isFlaming)
216            {
217                var2 = this.field_77281_g.iterator();
218    
219                while (var2.hasNext())
220                {
221                    var3 = (ChunkPosition)var2.next();
222                    var4 = var3.x;
223                    var5 = var3.y;
224                    var6 = var3.z;
225                    var7 = this.worldObj.getBlockId(var4, var5, var6);
226                    int var24 = this.worldObj.getBlockId(var4, var5 - 1, var6);
227    
228                    if (var7 == 0 && Block.opaqueCubeLookup[var24] && this.explosionRNG.nextInt(3) == 0)
229                    {
230                        this.worldObj.setBlockWithNotify(var4, var5, var6, Block.fire.blockID);
231                    }
232                }
233            }
234        }
235    
236        public Map func_77277_b()
237        {
238            return this.field_77288_k;
239        }
240    }