    001    package net.minecraft.src;
    002
    003    import cpw.mods.fml.common.Side;
    004    import cpw.mods.fml.common.asm.SideOnly;
    005    import java.util.List;
    006
    007    public class BlockPistonBase extends Block
    008    {
    009        /** This pistons is the sticky one? */
    010        private boolean isSticky;
    011
    012        public BlockPistonBase(int par1, int par2, boolean par3)
    013        {
    014            super(par1, par2, Material.piston);
    015            this.isSticky = par3;
    016            this.setStepSound(soundStoneFootstep);
    017            this.setHardness(0.5F);
    018            this.setCreativeTab(CreativeTabs.tabRedstone);
    019        }
    020
    021        @SideOnly(Side.CLIENT)
    022
    023        /**
    024         * Return the either 106 or 107 as the texture index depending on the isSticky flag. This will actually never get
    025         * called by TileEntityRendererPiston.renderPiston() because TileEntityPiston.shouldRenderHead() will always return
    026         * false.
    027         */
    028        public int getPistonExtensionTexture()
    029        {
    030            return this.isSticky ? 106 : 107;
    031        }
    032
    033        /**
    034         * From the specified side and block metadata retrieves the blocks texture. Args: side, metadata
    035         */
    036        public int getBlockTextureFromSideAndMetadata(int par1, int par2)
    037        {
    038            int var3 = getOrientation(par2);
    039            return var3 > 5 ? this.blockIndexInTexture : (par1 == var3 ? (!isExtended(par2) && this.minX <= 0.0D && this.minY <= 0.0D && this.minZ <= 0.0D && this.maxX >= 1.0D && this.maxY >= 1.0D && this.maxZ >= 1.0D ? this.blockIndexInTexture : 110) : (par1 == Facing.faceToSide[var3] ? 109 : 108));
    040        }
    041
    042        /**
    043         * The type of render function that is called for this block
    044         */
    045        public int getRenderType()
    046        {
    047            return 16;
    048        }
    049
    050        /**
    051         * Is this block (a) opaque and (b) a full 1m cube?  This determines whether or not to render the shared face of two
    052         * adjacent blocks and also whether the player can attach torches, redstone wire, etc to this block.
    053         */
    054        public boolean isOpaqueCube()
    055        {
    056            return false;
    057        }
    058
    059        /**
    060         * Called upon block activation (right click on the block.)
    061         */
    062        public boolean onBlockActivated(World par1World, int par2, int par3, int par4, EntityPlayer par5EntityPlayer, int par6, float par7, float par8, float par9)
    063        {
    064            return false;
    065        }
    066
    067        /**
    068         * Called when the block is placed in the world.
    069         */
    070        public void onBlockPlacedBy(World par1World, int par2, int par3, int par4, EntityLiving par5EntityLiving)
    071        {
    072            int var6 = determineOrientation(par1World, par2, par3, par4, (EntityPlayer)par5EntityLiving);
    073            par1World.setBlockMetadataWithNotify(par2, par3, par4, var6);
    074
    075            if (!par1World.isRemote)
    076            {
    077                this.updatePistonState(par1World, par2, par3, par4);
    078            }
    079        }
    080
    081        /**
    082         * Lets the block know when one of its neighbor changes. Doesn't know which neighbor changed (coordinates passed are
    083         * their own) Args: x, y, z, neighbor blockID
    084         */
    085        public void onNeighborBlockChange(World par1World, int par2, int par3, int par4, int par5)
    086        {
    087            if (!par1World.isRemote)
    088            {
    089                this.updatePistonState(par1World, par2, par3, par4);
    090            }
    091        }
    092
    093        /**
    094         * Called whenever the block is added into the world. Args: world, x, y, z
    095         */
    096        public void onBlockAdded(World par1World, int par2, int par3, int par4)
    097        {
    098            if (!par1World.isRemote && par1World.getBlockTileEntity(par2, par3, par4) == null)
    099            {
    100                this.updatePistonState(par1World, par2, par3, par4);
    101            }
    102        }
    103
    104        /**
    105         * handles attempts to extend or retract the piston.
    106         */
    107        private void updatePistonState(World par1World, int par2, int par3, int par4)
    108        {
    109            int var5 = par1World.getBlockMetadata(par2, par3, par4);
    110            int var6 = getOrientation(var5);
    111
    112            if (var6 != 7)
    113            {
    114                boolean var7 = this.isIndirectlyPowered(par1World, par2, par3, par4, var6);
    115
    116                if (var7 && !isExtended(var5))
    117                {
    118                    if (canExtend(par1World, par2, par3, par4, var6))
    119                    {
    120                        par1World.addBlockEvent(par2, par3, par4, this.blockID, 0, var6);
    121                    }
    122                }
    123                else if (!var7 && isExtended(var5))
    124                {
    125                    par1World.addBlockEvent(par2, par3, par4, this.blockID, 1, var6);
    126                }
    127            }
    128        }
    129
    130        /**
    131         * checks the block to that side to see if it is indirectly powered.
    132         */
    133        private boolean isIndirectlyPowered(World par1World, int par2, int par3, int par4, int par5)
    134        {
    135            return par5 != 0 && par1World.isBlockIndirectlyProvidingPowerTo(par2, par3 - 1, par4, 0) ? true : (par5 != 1 && par1World.isBlockIndirectlyProvidingPowerTo(par2, par3 + 1, par4, 1) ? true : (par5 != 2 && par1World.isBlockIndirectlyProvidingPowerTo(par2, par3, par4 - 1, 2) ? true : (par5 != 3 && par1World.isBlockIndirectlyProvidingPowerTo(par2, par3, par4 + 1, 3) ? true : (par5 != 5 && par1World.isBlockIndirectlyProvidingPowerTo(par2 + 1, par3, par4, 5) ? true : (par5 != 4 && par1World.isBlockIndirectlyProvidingPowerTo(par2 - 1, par3, par4, 4) ? true : (par1World.isBlockIndirectlyProvidingPowerTo(par2, par3, par4, 0) ? true : (par1World.isBlockIndirectlyProvidingPowerTo(par2, par3 + 2, par4, 1) ? true : (par1World.isBlockIndirectlyProvidingPowerTo(par2, par3 + 1, par4 - 1, 2) ? true : (par1World.isBlockIndirectlyProvidingPowerTo(par2, par3 + 1, par4 + 1, 3) ? true : (par1World.isBlockIndirectlyProvidingPowerTo(par2 - 1, par3 + 1, par4, 4) ? true : par1World.isBlockIndirectlyProvidingPowerTo(par2 + 1, par3 + 1, par4, 5)))))))))));
    136        }
    137
    138        /**
    139         * Called when the block receives a BlockEvent - see World.addBlockEvent. By default, passes it on to the tile
    140         * entity at this location. Args: world, x, y, z, blockID, EventID, event parameter
    141         */
    142        public void onBlockEventReceived(World par1World, int par2, int par3, int par4, int par5, int par6)
    143        {
    144            if (par5 == 0)
    145            {
    146                par1World.setBlockMetadata(par2, par3, par4, par6 | 8);
    147            }
    148            else
    149            {
    150                par1World.setBlockMetadata(par2, par3, par4, par6);
    151            }
    152
    153            if (par5 == 0)
    154            {
    155                if (this.tryExtend(par1World, par2, par3, par4, par6))
    156                {
    157                    par1World.setBlockMetadataWithNotify(par2, par3, par4, par6 | 8);
    158                    par1World.playSoundEffect((double)par2 + 0.5D, (double)par3 + 0.5D, (double)par4 + 0.5D, "tile.piston.out", 0.5F, par1World.rand.nextFloat() * 0.25F + 0.6F);
    159                }
    160                else
    161                {
    162                    par1World.setBlockMetadata(par2, par3, par4, par6);
    163                }
    164            }
    165            else if (par5 == 1)
    166            {
    167                TileEntity var7 = par1World.getBlockTileEntity(par2 + Facing.offsetsXForSide[par6], par3 + Facing.offsetsYForSide[par6], par4 + Facing.offsetsZForSide[par6]);
    168
    169                if (var7 instanceof TileEntityPiston)
    170                {
    171                    ((TileEntityPiston)var7).clearPistonTileEntity();
    172                }
    173
    174                par1World.setBlockAndMetadata(par2, par3, par4, Block.pistonMoving.blockID, par6);
    175                par1World.setBlockTileEntity(par2, par3, par4, BlockPistonMoving.getTileEntity(this.blockID, par6, par6, false, true));
    176
    177                if (this.isSticky)
    178                {
    179                    int var8 = par2 + Facing.offsetsXForSide[par6] * 2;
    180                    int var9 = par3 + Facing.offsetsYForSide[par6] * 2;
    181                    int var10 = par4 + Facing.offsetsZForSide[par6] * 2;
    182                    int var11 = par1World.getBlockId(var8, var9, var10);
    183                    int var12 = par1World.getBlockMetadata(var8, var9, var10);
    184                    boolean var13 = false;
    185
    186                    if (var11 == Block.pistonMoving.blockID)
    187                    {
    188                        TileEntity var14 = par1World.getBlockTileEntity(var8, var9, var10);
    189
    190                        if (var14 instanceof TileEntityPiston)
    191                        {
    192                            TileEntityPiston var15 = (TileEntityPiston)var14;
    193
    194                            if (var15.getPistonOrientation() == par6 && var15.isExtending())
    195                            {
    196                                var15.clearPistonTileEntity();
    197                                var11 = var15.getStoredBlockID();
    198                                var12 = var15.getBlockMetadata();
    199                                var13 = true;
    200                            }
    201                        }
    202                    }
    203
    204                    if (!var13 && var11 > 0 && canPushBlock(var11, par1World, var8, var9, var10, false) && (Block.blocksList[var11].getMobilityFlag() == 0 || var11 == Block.pistonBase.blockID || var11 == Block.pistonStickyBase.blockID))
    205                    {
    206                        par2 += Facing.offsetsXForSide[par6];
    207                        par3 += Facing.offsetsYForSide[par6];
    208                        par4 += Facing.offsetsZForSide[par6];
    209                        par1World.setBlockAndMetadata(par2, par3, par4, Block.pistonMoving.blockID, var12);
    210                        par1World.setBlockTileEntity(par2, par3, par4, BlockPistonMoving.getTileEntity(var11, var12, par6, false, false));
    211                        par1World.setBlockWithNotify(var8, var9, var10, 0);
    212                    }
    213                    else if (!var13)
    214                    {
    215                        par1World.setBlockWithNotify(par2 + Facing.offsetsXForSide[par6], par3 + Facing.offsetsYForSide[par6], par4 + Facing.offsetsZForSide[par6], 0);
    216                    }
    217                }
    218                else
    219                {
    220                    par1World.setBlockWithNotify(par2 + Facing.offsetsXForSide[par6], par3 + Facing.offsetsYForSide[par6], par4 + Facing.offsetsZForSide[par6], 0);
    221                }
    222
    223                par1World.playSoundEffect((double)par2 + 0.5D, (double)par3 + 0.5D, (double)par4 + 0.5D, "tile.piston.in", 0.5F, par1World.rand.nextFloat() * 0.15F + 0.6F);
    224            }
    225        }
    226
    227        /**
    228         * Updates the blocks bounds based on its current state. Args: world, x, y, z
    229         */
    230        public void setBlockBoundsBasedOnState(IBlockAccess par1IBlockAccess, int par2, int par3, int par4)
    231        {
    232            int var5 = par1IBlockAccess.getBlockMetadata(par2, par3, par4);
    233
    234            if (isExtended(var5))
    235            {
    236                switch (getOrientation(var5))
    237                {
    238                    case 0:
    239                        this.setBlockBounds(0.0F, 0.25F, 0.0F, 1.0F, 1.0F, 1.0F);
    240                        break;
    241                    case 1:
    242                        this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 0.75F, 1.0F);
    243                        break;
    244                    case 2:
    245                        this.setBlockBounds(0.0F, 0.0F, 0.25F, 1.0F, 1.0F, 1.0F);
    246                        break;
    247                    case 3:
    248                        this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 0.75F);
    249                        break;
    250                    case 4:
    251                        this.setBlockBounds(0.25F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
    252                        break;
    253                    case 5:
    254                        this.setBlockBounds(0.0F, 0.0F, 0.0F, 0.75F, 1.0F, 1.0F);
    255                }
    256            }
    257            else
    258            {
    259                this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
    260            }
    261        }
    262
    263        /**
    264         * Sets the block's bounds for rendering it as an item
    265         */
    266        public void setBlockBoundsForItemRender()
    267        {
    268            this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
    269        }
    270
    271        /**
    272         * if the specified block is in the given AABB, add its collision bounding box to the given list
    273         */
    274        public void addCollidingBlockToList(World par1World, int par2, int par3, int par4, AxisAlignedBB par5AxisAlignedBB, List par6List, Entity par7Entity)
    275        {
    276            this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
    277            super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    278        }
    279
    280        /**
    281         * Returns a bounding box from the pool of bounding boxes (this means this box can change after the pool has been
    282         * cleared to be reused)
    283         */
    284        public AxisAlignedBB getCollisionBoundingBoxFromPool(World par1World, int par2, int par3, int par4)
    285        {
    286            this.setBlockBoundsBasedOnState(par1World, par2, par3, par4);
    287            return super.getCollisionBoundingBoxFromPool(par1World, par2, par3, par4);
    288        }
    289
    290        /**
    291         * If this block doesn't render as an ordinary block it will return False (examples: signs, buttons, stairs, etc)
    292         */
    293        public boolean renderAsNormalBlock()
    294        {
    295            return false;
    296        }
    297
    298        /**
    299         * returns an int which describes the direction the piston faces
    300         */
    301        public static int getOrientation(int par0)
    302        {
    303            return par0 & 7;
    304        }
    305
    306        /**
    307         * Determine if the metadata is related to something powered.
    308         */
    309        public static boolean isExtended(int par0)
    310        {
    311            return (par0 & 8) != 0;
    312        }
    313
    314        /**
    315         * gets the way this piston should face for that entity that placed it.
    316         */
    317        public static int determineOrientation(World par0World, int par1, int par2, int par3, EntityPlayer par4EntityPlayer)
    318        {
    319            if (MathHelper.abs((float)par4EntityPlayer.posX - (float)par1) < 2.0F && MathHelper.abs((float)par4EntityPlayer.posZ - (float)par3) < 2.0F)
    320            {
    321                double var5 = par4EntityPlayer.posY + 1.82D - (double)par4EntityPlayer.yOffset;
    322
    323                if (var5 - (double)par2 > 2.0D)
    324                {
    325                    return 1;
    326                }
    327
    328                if ((double)par2 - var5 > 0.0D)
    329                {
    330                    return 0;
    331                }
    332            }
    333
    334            int var7 = MathHelper.floor_double((double)(par4EntityPlayer.rotationYaw * 4.0F / 360.0F) + 0.5D) & 3;
    335            return var7 == 0 ? 2 : (var7 == 1 ? 5 : (var7 == 2 ? 3 : (var7 == 3 ? 4 : 0)));
    336        }
    337
    338        /**
    339         * returns true if the piston can push the specified block
    340         */
    341        private static boolean canPushBlock(int par0, World par1World, int par2, int par3, int par4, boolean par5)
    342        {
    343            if (par0 == Block.obsidian.blockID)
    344            {
    345                return false;
    346            }
    347            else
    348            {
    349                if (par0 != Block.pistonBase.blockID && par0 != Block.pistonStickyBase.blockID)
    350                {
    351                    if (Block.blocksList[par0].getBlockHardness(par1World, par2, par3, par4) == -1.0F)
    352                    {
    353                        return false;
    354                    }
    355
    356                    if (Block.blocksList[par0].getMobilityFlag() == 2)
    357                    {
    358                        return false;
    359                    }
    360
    361                    if (!par5 && Block.blocksList[par0].getMobilityFlag() == 1)
    362                    {
    363                        return false;
    364                    }
    365                }
    366                else if (isExtended(par1World.getBlockMetadata(par2, par3, par4)))
    367                {
    368                    return false;
    369                }
    370
    371                return !par1World.blockHasTileEntity(par2, par3, par4);
    372            }
    373        }
    374
    375        /**
    376         * checks to see if this piston could push the blocks in front of it.
    377         */
    378        private static boolean canExtend(World par0World, int par1, int par2, int par3, int par4)
    379        {
    380            int var5 = par1 + Facing.offsetsXForSide[par4];
    381            int var6 = par2 + Facing.offsetsYForSide[par4];
    382            int var7 = par3 + Facing.offsetsZForSide[par4];
    383            int var8 = 0;
    384
    385            while (true)
    386            {
    387                if (var8 < 13)
    388                {
    389                    if (var6 <= 0 || var6 >= 255)
    390                    {
    391                        return false;
    392                    }
    393
    394                    int var9 = par0World.getBlockId(var5, var6, var7);
    395
    396                    if (var9 != 0)
    397                    {
    398                        if (!canPushBlock(var9, par0World, var5, var6, var7, true))
    399                        {
    400                            return false;
    401                        }
    402
    403                        if (Block.blocksList[var9].getMobilityFlag() != 1)
    404                        {
    405                            if (var8 == 12)
    406                            {
    407                                return false;
    408                            }
    409
    410                            var5 += Facing.offsetsXForSide[par4];
    411                            var6 += Facing.offsetsYForSide[par4];
    412                            var7 += Facing.offsetsZForSide[par4];
    413                            ++var8;
    414                            continue;
    415                        }
    416                    }
    417                }
    418
    419                return true;
    420            }
    421        }
    422
    423        /**
    424         * attempts to extend the piston. returns false if impossible.
    425         */
    426        private boolean tryExtend(World par1World, int par2, int par3, int par4, int par5)
    427        {
    428            int var6 = par2 + Facing.offsetsXForSide[par5];
    429            int var7 = par3 + Facing.offsetsYForSide[par5];
    430            int var8 = par4 + Facing.offsetsZForSide[par5];
    431            int var9 = 0;
    432
    433            while (true)
    434            {
    435                int var10;
    436
    437                if (var9 < 13)
    438                {
    439                    if (var7 <= 0 || var7 >= 255)
    440                    {
    441                        return false;
    442                    }
    443
    444                    var10 = par1World.getBlockId(var6, var7, var8);
    445
    446                    if (var10 != 0)
    447                    {
    448                        if (!canPushBlock(var10, par1World, var6, var7, var8, true))
    449                        {
    450                            return false;
    451                        }
    452
    453                        if (Block.blocksList[var10].getMobilityFlag() != 1)
    454                        {
    455                            if (var9 == 12)
    456                            {
    457                                return false;
    458                            }
    459
    460                            var6 += Facing.offsetsXForSide[par5];
    461                            var7 += Facing.offsetsYForSide[par5];
    462                            var8 += Facing.offsetsZForSide[par5];
    463                            ++var9;
    464                            continue;
    465                        }
    466
    467                        Block.blocksList[var10].dropBlockAsItem(par1World, var6, var7, var8, par1World.getBlockMetadata(var6, var7, var8), 0);
    468                        par1World.setBlockWithNotify(var6, var7, var8, 0);
    469                    }
    470                }
    471
    472                while (var6 != par2 || var7 != par3 || var8 != par4)
    473                {
    474                    var9 = var6 - Facing.offsetsXForSide[par5];
    475                    var10 = var7 - Facing.offsetsYForSide[par5];
    476                    int var11 = var8 - Facing.offsetsZForSide[par5];
    477                    int var12 = par1World.getBlockId(var9, var10, var11);
    478                    int var13 = par1World.getBlockMetadata(var9, var10, var11);
    479
    480                    if (var12 == this.blockID && var9 == par2 && var10 == par3 && var11 == par4)
    481                    {
    482                        par1World.setBlockAndMetadataWithUpdate(var6, var7, var8, Block.pistonMoving.blockID, par5 | (this.isSticky ? 8 : 0), false);
    483                        par1World.setBlockTileEntity(var6, var7, var8, BlockPistonMoving.getTileEntity(Block.pistonExtension.blockID, par5 | (this.isSticky ? 8 : 0), par5, true, false));
    484                    }
    485                    else
    486                    {
    487                        par1World.setBlockAndMetadataWithUpdate(var6, var7, var8, Block.pistonMoving.blockID, var13, false);
    488                        par1World.setBlockTileEntity(var6, var7, var8, BlockPistonMoving.getTileEntity(var12, var13, par5, true, false));
    489                    }
    490
    491                    var6 = var9;
    492                    var7 = var10;
    493                    var8 = var11;
    494                }
    495
    496                return true;
    497            }
    498        }
    499    }