001package net.minecraft.world;
002
003import java.util.ArrayList;
004import java.util.HashMap;
005import java.util.HashSet;
006import java.util.Iterator;
007import java.util.List;
008import java.util.Map;
009import java.util.Random;
010import net.minecraft.block.Block;
011import net.minecraft.enchantment.EnchantmentProtection;
012import net.minecraft.entity.Entity;
013import net.minecraft.entity.EntityLiving;
014import net.minecraft.entity.item.EntityTNTPrimed;
015import net.minecraft.entity.player.EntityPlayer;
016import net.minecraft.util.AxisAlignedBB;
017import net.minecraft.util.DamageSource;
018import net.minecraft.util.MathHelper;
019import net.minecraft.util.Vec3;
020
021public class Explosion
022{
023    /** whether or not the explosion sets fire to blocks around it */
024    public boolean isFlaming = false;
025
026    /** whether or not this explosion spawns smoke particles */
027    public boolean isSmoking = true;
028    private int field_77289_h = 16;
029    private Random explosionRNG = new Random();
030    private World worldObj;
031    public double explosionX;
032    public double explosionY;
033    public double explosionZ;
034    public Entity exploder;
035    public float explosionSize;
036
037    /** A list of ChunkPositions of blocks affected by this explosion */
038    public List affectedBlockPositions = new ArrayList();
039    private Map field_77288_k = new HashMap();
040
041    public Explosion(World par1World, Entity par2Entity, double par3, double par5, double par7, float par9)
042    {
043        this.worldObj = par1World;
044        this.exploder = par2Entity;
045        this.explosionSize = par9;
046        this.explosionX = par3;
047        this.explosionY = par5;
048        this.explosionZ = par7;
049    }
050
051    /**
052     * Does the first part of the explosion (destroy blocks)
053     */
054    public void doExplosionA()
055    {
056        float f = this.explosionSize;
057        HashSet hashset = new HashSet();
058        int i;
059        int j;
060        int k;
061        double d0;
062        double d1;
063        double d2;
064
065        for (i = 0; i < this.field_77289_h; ++i)
066        {
067            for (j = 0; j < this.field_77289_h; ++j)
068            {
069                for (k = 0; k < this.field_77289_h; ++k)
070                {
071                    if (i == 0 || i == this.field_77289_h - 1 || j == 0 || j == this.field_77289_h - 1 || k == 0 || k == this.field_77289_h - 1)
072                    {
073                        double d3 = (double)((float)i / ((float)this.field_77289_h - 1.0F) * 2.0F - 1.0F);
074                        double d4 = (double)((float)j / ((float)this.field_77289_h - 1.0F) * 2.0F - 1.0F);
075                        double d5 = (double)((float)k / ((float)this.field_77289_h - 1.0F) * 2.0F - 1.0F);
076                        double d6 = Math.sqrt(d3 * d3 + d4 * d4 + d5 * d5);
077                        d3 /= d6;
078                        d4 /= d6;
079                        d5 /= d6;
080                        float f1 = this.explosionSize * (0.7F + this.worldObj.rand.nextFloat() * 0.6F);
081                        d0 = this.explosionX;
082                        d1 = this.explosionY;
083                        d2 = this.explosionZ;
084
085                        for (float f2 = 0.3F; f1 > 0.0F; f1 -= f2 * 0.75F)
086                        {
087                            int l = MathHelper.floor_double(d0);
088                            int i1 = MathHelper.floor_double(d1);
089                            int j1 = MathHelper.floor_double(d2);
090                            int k1 = this.worldObj.getBlockId(l, i1, j1);
091
092                            if (k1 > 0)
093                            {
094                                Block block = Block.blocksList[k1];
095                                float f3 = this.exploder != null ? this.exploder.func_82146_a(this, this.worldObj, l, i1, j1, block) : block.getExplosionResistance(this.exploder, worldObj, l, i1, j1, explosionX, explosionY, explosionZ);
096                                f1 -= (f3 + 0.3F) * f2;
097                            }
098
099                            if (f1 > 0.0F && (this.exploder == null || this.exploder.func_96091_a(this, this.worldObj, l, i1, j1, k1, f1)))
100                            {
101                                hashset.add(new ChunkPosition(l, i1, j1));
102                            }
103
104                            d0 += d3 * (double)f2;
105                            d1 += d4 * (double)f2;
106                            d2 += d5 * (double)f2;
107                        }
108                    }
109                }
110            }
111        }
112
113        this.affectedBlockPositions.addAll(hashset);
114        this.explosionSize *= 2.0F;
115        i = MathHelper.floor_double(this.explosionX - (double)this.explosionSize - 1.0D);
116        j = MathHelper.floor_double(this.explosionX + (double)this.explosionSize + 1.0D);
117        k = MathHelper.floor_double(this.explosionY - (double)this.explosionSize - 1.0D);
118        int l1 = MathHelper.floor_double(this.explosionY + (double)this.explosionSize + 1.0D);
119        int i2 = MathHelper.floor_double(this.explosionZ - (double)this.explosionSize - 1.0D);
120        int j2 = MathHelper.floor_double(this.explosionZ + (double)this.explosionSize + 1.0D);
121        List list = this.worldObj.getEntitiesWithinAABBExcludingEntity(this.exploder, AxisAlignedBB.getAABBPool().getAABB((double)i, (double)k, (double)i2, (double)j, (double)l1, (double)j2));
122        Vec3 vec3 = this.worldObj.getWorldVec3Pool().getVecFromPool(this.explosionX, this.explosionY, this.explosionZ);
123
124        for (int k2 = 0; k2 < list.size(); ++k2)
125        {
126            Entity entity = (Entity)list.get(k2);
127            double d7 = entity.getDistance(this.explosionX, this.explosionY, this.explosionZ) / (double)this.explosionSize;
128
129            if (d7 <= 1.0D)
130            {
131                d0 = entity.posX - this.explosionX;
132                d1 = entity.posY + (double)entity.getEyeHeight() - this.explosionY;
133                d2 = entity.posZ - this.explosionZ;
134                double d8 = (double)MathHelper.sqrt_double(d0 * d0 + d1 * d1 + d2 * d2);
135
136                if (d8 != 0.0D)
137                {
138                    d0 /= d8;
139                    d1 /= d8;
140                    d2 /= d8;
141                    double d9 = (double)this.worldObj.getBlockDensity(vec3, entity.boundingBox);
142                    double d10 = (1.0D - d7) * d9;
143                    entity.attackEntityFrom(DamageSource.func_94539_a(this), (int)((d10 * d10 + d10) / 2.0D * 8.0D * (double)this.explosionSize + 1.0D));
144                    double d11 = EnchantmentProtection.func_92092_a(entity, d10);
145                    entity.motionX += d0 * d11;
146                    entity.motionY += d1 * d11;
147                    entity.motionZ += d2 * d11;
148
149                    if (entity instanceof EntityPlayer)
150                    {
151                        this.field_77288_k.put((EntityPlayer)entity, this.worldObj.getWorldVec3Pool().getVecFromPool(d0 * d10, d1 * d10, d2 * d10));
152                    }
153                }
154            }
155        }
156
157        this.explosionSize = f;
158    }
159
160    /**
161     * Does the second part of the explosion (sound, particles, drop spawn)
162     */
163    public void doExplosionB(boolean par1)
164    {
165        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);
166
167        if (this.explosionSize >= 2.0F && this.isSmoking)
168        {
169            this.worldObj.spawnParticle("hugeexplosion", this.explosionX, this.explosionY, this.explosionZ, 1.0D, 0.0D, 0.0D);
170        }
171        else
172        {
173            this.worldObj.spawnParticle("largeexplode", this.explosionX, this.explosionY, this.explosionZ, 1.0D, 0.0D, 0.0D);
174        }
175
176        Iterator iterator;
177        ChunkPosition chunkposition;
178        int i;
179        int j;
180        int k;
181        int l;
182
183        if (this.isSmoking)
184        {
185            iterator = this.affectedBlockPositions.iterator();
186
187            while (iterator.hasNext())
188            {
189                chunkposition = (ChunkPosition)iterator.next();
190                i = chunkposition.x;
191                j = chunkposition.y;
192                k = chunkposition.z;
193                l = this.worldObj.getBlockId(i, j, k);
194
195                if (par1)
196                {
197                    double d0 = (double)((float)i + this.worldObj.rand.nextFloat());
198                    double d1 = (double)((float)j + this.worldObj.rand.nextFloat());
199                    double d2 = (double)((float)k + this.worldObj.rand.nextFloat());
200                    double d3 = d0 - this.explosionX;
201                    double d4 = d1 - this.explosionY;
202                    double d5 = d2 - this.explosionZ;
203                    double d6 = (double)MathHelper.sqrt_double(d3 * d3 + d4 * d4 + d5 * d5);
204                    d3 /= d6;
205                    d4 /= d6;
206                    d5 /= d6;
207                    double d7 = 0.5D / (d6 / (double)this.explosionSize + 0.1D);
208                    d7 *= (double)(this.worldObj.rand.nextFloat() * this.worldObj.rand.nextFloat() + 0.3F);
209                    d3 *= d7;
210                    d4 *= d7;
211                    d5 *= d7;
212                    this.worldObj.spawnParticle("explode", (d0 + this.explosionX * 1.0D) / 2.0D, (d1 + this.explosionY * 1.0D) / 2.0D, (d2 + this.explosionZ * 1.0D) / 2.0D, d3, d4, d5);
213                    this.worldObj.spawnParticle("smoke", d0, d1, d2, d3, d4, d5);
214                }
215
216                if (l > 0)
217                {
218                    Block block = Block.blocksList[l];
219
220                    if (block.canDropFromExplosion(this))
221                    {
222                        block.dropBlockAsItemWithChance(this.worldObj, i, j, k, this.worldObj.getBlockMetadata(i, j, k), 1.0F / this.explosionSize, 0);
223                    }
224
225                    this.worldObj.setBlockAndMetadataWithNotify(i, j, k, 0, 0, 3);
226                    block.onBlockDestroyedByExplosion(this.worldObj, i, j, k, this);
227                }
228            }
229        }
230
231        if (this.isFlaming)
232        {
233            iterator = this.affectedBlockPositions.iterator();
234
235            while (iterator.hasNext())
236            {
237                chunkposition = (ChunkPosition)iterator.next();
238                i = chunkposition.x;
239                j = chunkposition.y;
240                k = chunkposition.z;
241                l = this.worldObj.getBlockId(i, j, k);
242                int i1 = this.worldObj.getBlockId(i, j - 1, k);
243
244                if (l == 0 && Block.opaqueCubeLookup[i1] && this.explosionRNG.nextInt(3) == 0)
245                {
246                    this.worldObj.func_94575_c(i, j, k, Block.fire.blockID);
247                }
248            }
249        }
250    }
251
252    public Map func_77277_b()
253    {
254        return this.field_77288_k;
255    }
256
257    public EntityLiving func_94613_c()
258    {
259        return this.exploder == null ? null : (this.exploder instanceof EntityTNTPrimed ? ((EntityTNTPrimed)this.exploder).func_94083_c() : (this.exploder instanceof EntityLiving ? (EntityLiving)this.exploder : null));
260    }
261}