tcr/java/src/game/world/Explosion.java

package game.world;

import java.util.List;
import java.util.Map;
import java.util.Set;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;

import game.block.Block;
import game.enchantment.EnchantmentProtection;
import game.entity.DamageSource;
import game.entity.Entity;
import game.entity.item.EntityTnt;
import game.entity.npc.EntityNPC;
import game.entity.types.EntityLiving;
import game.init.Blocks;
import game.init.Config;
import game.init.SoundEvent;
import game.material.Material;
import game.renderer.particle.ParticleType;
import game.rng.Random;
import game.util.ExtMath;

public class Explosion
{
    /** whether or not the explosion sets fire to blocks around it */
    private final boolean isFlaming;

    /** whether or not this explosion spawns smoke particles */
    private final boolean isSmoking;
    private final Random explosionRNG;
    private final World worldObj;
    private final double explosionX;
    private final double explosionY;
    private final double explosionZ;
    private final Entity exploder;
    private final float explosionSize;
    private final List<BlockPos> affectedBlockPositions;
    private final Map<EntityNPC, Vec3> playerKnockbackMap;

    public Explosion(World worldIn, Entity entityIn, double x, double y, double z, float size, List<BlockPos> affectedPositions)
    {
        this(worldIn, entityIn, x, y, z, size, false, true, affectedPositions);
    }

    public Explosion(World worldIn, Entity entityIn, double x, double y, double z, float size, boolean flaming, boolean smoking, List<BlockPos> affectedPositions)
    {
        this(worldIn, entityIn, x, y, z, size, flaming, smoking);
        this.affectedBlockPositions.addAll(affectedPositions);
    }

    public Explosion(World worldIn, Entity entityIn, double x, double y, double z, float size, boolean flaming, boolean smoking)
    {
        this.explosionRNG = new Random();
        this.affectedBlockPositions = Lists.<BlockPos>newArrayList();
        this.playerKnockbackMap = Maps.<EntityNPC, Vec3>newHashMap();
        this.worldObj = worldIn;
        this.exploder = entityIn;
        this.explosionSize = size;
        this.explosionX = x;
        this.explosionY = y;
        this.explosionZ = z;
        this.isFlaming = flaming;
        this.isSmoking = smoking;
    }
    
    public void doExplosionAlgo1(Set<BlockPos> set)
    {
        int i = 16;

        for (int j = 0; j < 16; ++j)
        {
            for (int k = 0; k < 16; ++k)
            {
                for (int l = 0; l < 16; ++l)
                {
                    if (j == 0 || j == 15 || k == 0 || k == 15 || l == 0 || l == 15)
                    {
                        double d0 = (double)((float)j / 15.0F * 2.0F - 1.0F);
                        double d1 = (double)((float)k / 15.0F * 2.0F - 1.0F);
                        double d2 = (double)((float)l / 15.0F * 2.0F - 1.0F);
                        double d3 = Math.sqrt(d0 * d0 + d1 * d1 + d2 * d2);
                        d0 = d0 / d3;
                        d1 = d1 / d3;
                        d2 = d2 / d3;
                        float f = this.explosionSize * (0.7F + this.worldObj.rand.floatv() * 0.6F);
                        double d4 = this.explosionX;
                        double d6 = this.explosionY;
                        double d8 = this.explosionZ;

                        for (float f1 = 0.3F; f > 0.0F; f -= 0.22500001F)
                        {
                            BlockPos blockpos = new BlockPos(d4, d6, d8);
                            State iblockstate = this.worldObj.getState(blockpos);

                            if (iblockstate.getBlock().getMaterial() != Material.air)
                            {
                                float f2 = this.exploder != null ? this.exploder.getExplosionResistance(this, this.worldObj, blockpos, iblockstate) : iblockstate.getBlock().getExplosionResistance((Entity)null);
                                f -= (f2 + 0.3F) * 0.3F;
                            }

                            if (f > 0.0F && (this.exploder == null || this.exploder.verifyExplosion(this, this.worldObj, blockpos, iblockstate, f)))
                            {
                                set.add(blockpos);
                            }

                            d4 += d0 * 0.30000001192092896D;
                            d6 += d1 * 0.30000001192092896D;
                            d8 += d2 * 0.30000001192092896D;
                        }
                    }
                }
            }
        }
    }
    
    public void doExplosionAlgo2(Set<BlockPos> set)
    {
    	int d = ((int)this.explosionSize) + 1;
    	double falloff = this.explosionSize * 0.125d;
    	falloff = falloff > 4.0d ? 4.0d : falloff;
        for (int x = -d; x <= d; ++x)
        {
            for (int y = -d; y <= d; ++y)
            {
                for (int z = -d; z <= d; ++z)
                {
                	double dist = (double)ExtMath.sqrtd(((double)x) * ((double)x) + ((double)y) * ((double)y) + ((double)z) * ((double)z));
                	if(dist < this.explosionSize - falloff || 
                			(dist < this.explosionSize && this.explosionRNG.doublev() + ((dist - (this.explosionSize - falloff)) / falloff) < 1.0d)) {
                		BlockPos blockpos = new BlockPos(this.explosionX + x, this.explosionY + y, this.explosionZ + z);
                		State iblockstate = this.worldObj.getState(blockpos);

                		float f = this.explosionSize; // * (0.7F + this.worldObj.rand.nextFloat() * 0.6F);
                        if (iblockstate.getBlock().getMaterial() != Material.air)
                        {
                            float f2 = this.exploder != null ? this.exploder.getExplosionResistance(this, this.worldObj, blockpos, iblockstate) : iblockstate.getBlock().getExplosionResistance((Entity)null);
                            f -= (f2 + 0.3F) * 0.3F;
                        }

                        if (f > 0.0F && (this.exploder == null || this.exploder.verifyExplosion(this, this.worldObj, blockpos, iblockstate, f)))
                        {
                            set.add(blockpos);
                        }
                	}
                }
            }
        }
    }
    
    public static void doExplosionAlgo3(World worldObj, double explosionX, double explosionY, double explosionZ, Random rand, double explosionSize, double minDist)
    {
    	int d = ((int)explosionSize) + 1;
    	double falloff = explosionSize * 0.125d;
    	falloff = falloff > 4.0d ? 4.0d : falloff;
        for (int x = -d; x <= d; ++x)
        {
            for (int y = -d; y <= d; ++y)
            {
                for (int z = -d; z <= d; ++z)
                {
                	double dist = (double)ExtMath.sqrtd(((double)x) * ((double)x) + ((double)y) * ((double)y) + ((double)z) * ((double)z));
                	if(dist > minDist && (dist < explosionSize - falloff || 
                			(dist < explosionSize && rand.doublev() + ((dist - (explosionSize - falloff)) / falloff) < 1.0d))) {
                		BlockPos blockpos = new BlockPos(explosionX + x, explosionY + y, explosionZ + z);
                		State iblockstate = worldObj.getState(blockpos);
                        if(iblockstate.getBlock().getMaterial() != Material.air && iblockstate.getBlock().getExplosionResistance(null) < 60000.0f) {
                        	worldObj.setState(blockpos, Blocks.air.getState(), 3);
                        	if(rand.chance(1000)) {
                        		worldObj.playSound(SoundEvent.EXPLODE, explosionX + x, explosionY + y, explosionZ + z, 4.0F, (1.0F + (worldObj.rand.floatv() - worldObj.rand.floatv()) * 0.2F) * 0.7F);
                        		((WorldServer)worldObj).spawnParticle(ParticleType.EXPLOSION_HUGE, explosionX + x, explosionY + y, explosionZ + z, 0, rand.gaussian() * 0.02D, rand.gaussian() * 0.02D, rand.gaussian() * 0.02D, 1.0);
                        	}
                        }
                	}
                }
            }
        }
        
        if(worldObj.client || Config.damageExplosion) {
	        List<Entity> list = worldObj.getEntitiesWithinAABB(Entity.class, new BoundingBox(explosionX - (5.0 + (double)d), explosionY - (5.0 + (double)d), 
	        		explosionZ - (5.0 + (double)d), explosionX + 5.0 + (double)d, explosionY + 5.0 + (double)d, explosionZ + 5.0 + (double)d));
	
	        for (Entity entity : list)
	        {
	            if (!entity.isImmuneToExplosions())
	            {
	            	double dist = (double)ExtMath.sqrtd((entity.posX - explosionX) * (entity.posX - explosionX) + 
	            			(entity.posY - explosionY) * (entity.posY - explosionY) + (entity.posZ - explosionZ) * (entity.posZ - explosionZ));
	            	if((dist > minDist - 5.0) && (dist < explosionSize + 5.0)) {
	            		entity.attackEntityFrom(DamageSource.causeExplosionDamage(null), 10000);
	                }
	            }
	        }
        }
    }

    /**
     * Does the first part of the explosion (destroy blocks)
     */
    public void doExplosionA()
    {
        Set<BlockPos> set = Sets.<BlockPos>newHashSet();

        if(this.explosionSize <= 8.0d) {
            this.doExplosionAlgo1(set);
        }
        else {
        	this.doExplosionAlgo2(set);
        }

        this.affectedBlockPositions.addAll(set);
        float f3 = this.explosionSize * 2.0F;
        int k1 = ExtMath.floord(this.explosionX - (double)f3 - 1.0D);
        int l1 = ExtMath.floord(this.explosionX + (double)f3 + 1.0D);
        int i2 = ExtMath.floord(this.explosionY - (double)f3 - 1.0D);
        int i1 = ExtMath.floord(this.explosionY + (double)f3 + 1.0D);
        int j2 = ExtMath.floord(this.explosionZ - (double)f3 - 1.0D);
        int j1 = ExtMath.floord(this.explosionZ + (double)f3 + 1.0D);
        List<Entity> list = this.worldObj.getEntitiesWithinAABBExcludingEntity(this.exploder, new BoundingBox((double)k1, (double)i2, (double)j2, (double)l1, (double)i1, (double)j1));
        Vec3 vec3 = new Vec3(this.explosionX, this.explosionY, this.explosionZ);

        for (int k2 = 0; k2 < list.size(); ++k2)
        {
            Entity entity = (Entity)list.get(k2);

            if (!entity.isImmuneToExplosions())
            {
                double d12 = entity.getDistance(this.explosionX, this.explosionY, this.explosionZ) / (double)f3;

                if (d12 <= 1.0D)
                {
                    double d5 = entity.posX - this.explosionX;
                    double d7 = entity.posY + (double)entity.getEyeHeight() - this.explosionY;
                    double d9 = entity.posZ - this.explosionZ;
                    double d13 = (double)ExtMath.sqrtd(d5 * d5 + d7 * d7 + d9 * d9);

                    if (d13 != 0.0D)
                    {
                        d5 = d5 / d13;
                        d7 = d7 / d13;
                        d9 = d9 / d13;
                        double d14 = (double)this.worldObj.getBlockDensity(vec3, entity.getEntityBoundingBox());
                        double d10 = (1.0D - d12) * d14;
                        if(this.worldObj.client || Config.damageExplosion)
                        	entity.attackEntityFrom(DamageSource.causeExplosionDamage(this), ((int)((d10 * d10 + d10) / 2.0D * 8.0D * (double)f3 + 1.0D)));
                        double d11 = EnchantmentProtection.func_92092_a(entity, d10);
                        entity.motionX += d5 * d11;
                        entity.motionY += d7 * d11;
                        entity.motionZ += d9 * d11;

                        if (entity.isPlayer()) //  && !((EntityNPC)entity).creative)
                        {
                            this.playerKnockbackMap.put((EntityNPC)entity, new Vec3(d5 * d10, d7 * d10, d9 * d10));
                        }
                    }
                }
            }
        }
    }

    /**
     * Does the second part of the explosion (sound, particles, drop spawn)
     */
    public void doExplosionB(boolean spawnParticles, boolean altSound)
    {
        this.worldObj.playSound(altSound ? SoundEvent.EXPLODE_ALT : SoundEvent.EXPLODE, this.explosionX, this.explosionY, this.explosionZ, 4.0F, (1.0F + (this.worldObj.rand.floatv() - this.worldObj.rand.floatv()) * 0.2F) * 0.7F);

        if (this.explosionSize >= 2.0F && this.isSmoking)
        {
            this.worldObj.spawnParticle(ParticleType.EXPLOSION_HUGE, this.explosionX, this.explosionY, this.explosionZ, 1.0D, 0.0D, 0.0D);
        }
        else
        {
            this.worldObj.spawnParticle(ParticleType.EXPLOSION_LARGE, this.explosionX, this.explosionY, this.explosionZ, 1.0D, 0.0D, 0.0D);
        }

        if (this.isSmoking)
        {
            for (BlockPos blockpos : this.affectedBlockPositions)
            {
            	State state = this.worldObj.getState(blockpos);
                Block block = state.getBlock();

                if (spawnParticles)
                {
                    double d0 = (double)((float)blockpos.getX() + this.worldObj.rand.floatv());
                    double d1 = (double)((float)blockpos.getY() + this.worldObj.rand.floatv());
                    double d2 = (double)((float)blockpos.getZ() + this.worldObj.rand.floatv());
                    double d3 = d0 - this.explosionX;
                    double d4 = d1 - this.explosionY;
                    double d5 = d2 - this.explosionZ;
                    double d6 = (double)ExtMath.sqrtd(d3 * d3 + d4 * d4 + d5 * d5);
                    d3 = d3 / d6;
                    d4 = d4 / d6;
                    d5 = d5 / d6;
                    double d7 = 0.5D / (d6 / (double)this.explosionSize + 0.1D);
                    d7 = d7 * (double)(this.worldObj.rand.floatv() * this.worldObj.rand.floatv() + 0.3F);
                    d3 = d3 * d7;
                    d4 = d4 * d7;
                    d5 = d5 * d7;
                    this.worldObj.spawnParticle(ParticleType.EXPLOSION_NORMAL, (d0 + this.explosionX * 1.0D) / 2.0D, (d1 + this.explosionY * 1.0D) / 2.0D, (d2 + this.explosionZ * 1.0D) / 2.0D, d3, d4, d5);
                    this.worldObj.spawnParticle(ParticleType.SMOKE_NORMAL, d0, d1, d2, d3, d4, d5);
                }

                if (block.getMaterial() != Material.air)
                {
                    if (block.canDropFromExplosion(this))
                    {
                        block.dropBlockAsItemWithChance(this.worldObj, blockpos, this.worldObj.getState(blockpos), 1.0F / this.explosionSize, 0);
                    }

                    this.worldObj.setState(blockpos, Blocks.air.getState(), 3);
                    block.onBlockDestroyedByExplosion(this.worldObj, blockpos, this, state);
                }
            }
        }

        if (this.isFlaming)
        {
            for (BlockPos blockpos1 : this.affectedBlockPositions)
            {
                if (this.worldObj.getState(blockpos1).getBlock().getMaterial() == Material.air && this.worldObj.getState(blockpos1.down()).getBlock().isFullBlock() && this.explosionRNG.zrange(3) == 0)
                {
                    this.worldObj.setState(blockpos1, Blocks.fire.getState());
                }
            }
        }
    }

    public Map<EntityNPC, Vec3> getPlayerKnockbackMap()
    {
        return this.playerKnockbackMap;
    }

    /**
     * Returns either the entity that placed the explosive block, the entity that caused the explosion or null.
     */
    public EntityLiving getExplosivePlacedBy()
    {
        return this.exploder == null ? null : (this.exploder instanceof EntityTnt ? ((EntityTnt)this.exploder).getTntPlacedBy() : (this.exploder instanceof EntityLiving ? (EntityLiving)this.exploder : null));
    }

    public void clearAffectedBlockPositions()
    {
        this.affectedBlockPositions.clear();
    }

    public List<BlockPos> getAffectedBlockPositions()
    {
        return this.affectedBlockPositions;
    }
}