    001    package net.minecraft.block;
    002
    003    import cpw.mods.fml.common.Side;
    004    import cpw.mods.fml.common.asm.SideOnly;
    005    import java.util.List;
    006    import net.minecraft.block.material.Material;
    007    import net.minecraft.creativetab.CreativeTabs;
    008    import net.minecraft.entity.Entity;
    009    import net.minecraft.entity.EntityLiving;
    010    import net.minecraft.entity.player.EntityPlayer;
    011    import net.minecraft.tileentity.TileEntity;
    012    import net.minecraft.tileentity.TileEntityPiston;
    013    import net.minecraft.util.AxisAlignedBB;
    014    import net.minecraft.util.Facing;
    015    import net.minecraft.util.MathHelper;
    016    import net.minecraft.world.IBlockAccess;
    017    import net.minecraft.world.World;
    018
    019    public class BlockPistonBase extends Block
    020    {
    021        /** This pistons is the sticky one? */
    022        private boolean isSticky;
    023
    024        public BlockPistonBase(int par1, int par2, boolean par3)
    025        {
    026            super(par1, par2, Material.piston);
    027            this.isSticky = par3;
    028            this.setStepSound(soundStoneFootstep);
    029            this.setHardness(0.5F);
    030            this.setCreativeTab(CreativeTabs.tabRedstone);
    031        }
    032
    033        @SideOnly(Side.CLIENT)
    034
    035        /**
    036         * Return the either 106 or 107 as the texture index depending on the isSticky flag. This will actually never get
    037         * called by TileEntityRendererPiston.renderPiston() because TileEntityPiston.shouldRenderHead() will always return
    038         * false.
    039         */
    040        public int getPistonExtensionTexture()
    041        {
    042            return this.isSticky ? 106 : 107;
    043        }
    044
    045        /**
    046         * From the specified side and block metadata retrieves the blocks texture. Args: side, metadata
    047         */
    048        public int getBlockTextureFromSideAndMetadata(int par1, int par2)
    049        {
    050            int var3 = getOrientation(par2);
    051            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));
    052        }
    053
    054        /**
    055         * The type of render function that is called for this block
    056         */
    057        public int getRenderType()
    058        {
    059            return 16;
    060        }
    061
    062        /**
    063         * Is this block (a) opaque and (b) a full 1m cube?  This determines whether or not to render the shared face of two
    064         * adjacent blocks and also whether the player can attach torches, redstone wire, etc to this block.
    065         */
    066        public boolean isOpaqueCube()
    067        {
    068            return false;
    069        }
    070
    071        /**
    072         * Called upon block activation (right click on the block.)
    073         */
    074        public boolean onBlockActivated(World par1World, int par2, int par3, int par4, EntityPlayer par5EntityPlayer, int par6, float par7, float par8, float par9)
    075        {
    076            return false;
    077        }
    078
    079        /**
    080         * Called when the block is placed in the world.
    081         */
    082        public void onBlockPlacedBy(World par1World, int par2, int par3, int par4, EntityLiving par5EntityLiving)
    083        {
    084            int var6 = determineOrientation(par1World, par2, par3, par4, (EntityPlayer)par5EntityLiving);
    085            par1World.setBlockMetadataWithNotify(par2, par3, par4, var6);
    086
    087            if (!par1World.isRemote)
    088            {
    089                this.updatePistonState(par1World, par2, par3, par4);
    090            }
    091        }
    092
    093        /**
    094         * Lets the block know when one of its neighbor changes. Doesn't know which neighbor changed (coordinates passed are
    095         * their own) Args: x, y, z, neighbor blockID
    096         */
    097        public void onNeighborBlockChange(World par1World, int par2, int par3, int par4, int par5)
    098        {
    099            if (!par1World.isRemote)
    100            {
    101                this.updatePistonState(par1World, par2, par3, par4);
    102            }
    103        }
    104
    105        /**
    106         * Called whenever the block is added into the world. Args: world, x, y, z
    107         */
    108        public void onBlockAdded(World par1World, int par2, int par3, int par4)
    109        {
    110            if (!par1World.isRemote && par1World.getBlockTileEntity(par2, par3, par4) == null)
    111            {
    112                this.updatePistonState(par1World, par2, par3, par4);
    113            }
    114        }
    115
    116        /**
    117         * handles attempts to extend or retract the piston.
    118         */
    119        private void updatePistonState(World par1World, int par2, int par3, int par4)
    120        {
    121            int var5 = par1World.getBlockMetadata(par2, par3, par4);
    122            int var6 = getOrientation(var5);
    123
    124            if (var6 != 7)
    125            {
    126                boolean var7 = this.isIndirectlyPowered(par1World, par2, par3, par4, var6);
    127
    128                if (var7 && !isExtended(var5))
    129                {
    130                    if (canExtend(par1World, par2, par3, par4, var6))
    131                    {
    132                        par1World.addBlockEvent(par2, par3, par4, this.blockID, 0, var6);
    133                    }
    134                }
    135                else if (!var7 && isExtended(var5))
    136                {
    137                    par1World.addBlockEvent(par2, par3, par4, this.blockID, 1, var6);
    138                }
    139            }
    140        }
    141
    142        /**
    143         * checks the block to that side to see if it is indirectly powered.
    144         */
    145        private boolean isIndirectlyPowered(World par1World, int par2, int par3, int par4, int par5)
    146        {
    147            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)))))))))));
    148        }
    149
    150        /**
    151         * Called when the block receives a BlockEvent - see World.addBlockEvent. By default, passes it on to the tile
    152         * entity at this location. Args: world, x, y, z, blockID, EventID, event parameter
    153         */
    154        public void onBlockEventReceived(World par1World, int par2, int par3, int par4, int par5, int par6)
    155        {
    156            if (par5 == 0)
    157            {
    158                par1World.setBlockMetadata(par2, par3, par4, par6 | 8);
    159            }
    160            else
    161            {
    162                par1World.setBlockMetadata(par2, par3, par4, par6);
    163            }
    164
    165            if (par5 == 0)
    166            {
    167                if (this.tryExtend(par1World, par2, par3, par4, par6))
    168                {
    169                    par1World.setBlockMetadataWithNotify(par2, par3, par4, par6 | 8);
    170                    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);
    171                }
    172                else
    173                {
    174                    par1World.setBlockMetadata(par2, par3, par4, par6);
    175                }
    176            }
    177            else if (par5 == 1)
    178            {
    179                TileEntity var7 = par1World.getBlockTileEntity(par2 + Facing.offsetsXForSide[par6], par3 + Facing.offsetsYForSide[par6], par4 + Facing.offsetsZForSide[par6]);
    180
    181                if (var7 instanceof TileEntityPiston)
    182                {
    183                    ((TileEntityPiston)var7).clearPistonTileEntity();
    184                }
    185
    186                par1World.setBlockAndMetadata(par2, par3, par4, Block.pistonMoving.blockID, par6);
    187                par1World.setBlockTileEntity(par2, par3, par4, BlockPistonMoving.getTileEntity(this.blockID, par6, par6, false, true));
    188
    189                if (this.isSticky)
    190                {
    191                    int var8 = par2 + Facing.offsetsXForSide[par6] * 2;
    192                    int var9 = par3 + Facing.offsetsYForSide[par6] * 2;
    193                    int var10 = par4 + Facing.offsetsZForSide[par6] * 2;
    194                    int var11 = par1World.getBlockId(var8, var9, var10);
    195                    int var12 = par1World.getBlockMetadata(var8, var9, var10);
    196                    boolean var13 = false;
    197
    198                    if (var11 == Block.pistonMoving.blockID)
    199                    {
    200                        TileEntity var14 = par1World.getBlockTileEntity(var8, var9, var10);
    201
    202                        if (var14 instanceof TileEntityPiston)
    203                        {
    204                            TileEntityPiston var15 = (TileEntityPiston)var14;
    205
    206                            if (var15.getPistonOrientation() == par6 && var15.isExtending())
    207                            {
    208                                var15.clearPistonTileEntity();
    209                                var11 = var15.getStoredBlockID();
    210                                var12 = var15.getBlockMetadata();
    211                                var13 = true;
    212                            }
    213                        }
    214                    }
    215
    216                    if (!var13 && var11 > 0 && canPushBlock(var11, par1World, var8, var9, var10, false) && (Block.blocksList[var11].getMobilityFlag() == 0 || var11 == Block.pistonBase.blockID || var11 == Block.pistonStickyBase.blockID))
    217                    {
    218                        par2 += Facing.offsetsXForSide[par6];
    219                        par3 += Facing.offsetsYForSide[par6];
    220                        par4 += Facing.offsetsZForSide[par6];
    221                        par1World.setBlockAndMetadata(par2, par3, par4, Block.pistonMoving.blockID, var12);
    222                        par1World.setBlockTileEntity(par2, par3, par4, BlockPistonMoving.getTileEntity(var11, var12, par6, false, false));
    223                        par1World.setBlockWithNotify(var8, var9, var10, 0);
    224                    }
    225                    else if (!var13)
    226                    {
    227                        par1World.setBlockWithNotify(par2 + Facing.offsetsXForSide[par6], par3 + Facing.offsetsYForSide[par6], par4 + Facing.offsetsZForSide[par6], 0);
    228                    }
    229                }
    230                else
    231                {
    232                    par1World.setBlockWithNotify(par2 + Facing.offsetsXForSide[par6], par3 + Facing.offsetsYForSide[par6], par4 + Facing.offsetsZForSide[par6], 0);
    233                }
    234
    235                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);
    236            }
    237        }
    238
    239        /**
    240         * Updates the blocks bounds based on its current state. Args: world, x, y, z
    241         */
    242        public void setBlockBoundsBasedOnState(IBlockAccess par1IBlockAccess, int par2, int par3, int par4)
    243        {
    244            int var5 = par1IBlockAccess.getBlockMetadata(par2, par3, par4);
    245
    246            if (isExtended(var5))
    247            {
    248                switch (getOrientation(var5))
    249                {
    250                    case 0:
    251                        this.setBlockBounds(0.0F, 0.25F, 0.0F, 1.0F, 1.0F, 1.0F);
    252                        break;
    253                    case 1:
    254                        this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 0.75F, 1.0F);
    255                        break;
    256                    case 2:
    257                        this.setBlockBounds(0.0F, 0.0F, 0.25F, 1.0F, 1.0F, 1.0F);
    258                        break;
    259                    case 3:
    260                        this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 0.75F);
    261                        break;
    262                    case 4:
    263                        this.setBlockBounds(0.25F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
    264                        break;
    265                    case 5:
    266                        this.setBlockBounds(0.0F, 0.0F, 0.0F, 0.75F, 1.0F, 1.0F);
    267                }
    268            }
    269            else
    270            {
    271                this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
    272            }
    273        }
    274
    275        /**
    276         * Sets the block's bounds for rendering it as an item
    277         */
    278        public void setBlockBoundsForItemRender()
    279        {
    280            this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
    281        }
    282
    283        /**
    284         * if the specified block is in the given AABB, add its collision bounding box to the given list
    285         */
    286        public void addCollidingBlockToList(World par1World, int par2, int par3, int par4, AxisAlignedBB par5AxisAlignedBB, List par6List, Entity par7Entity)
    287        {
    288            this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
    289            super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    290        }
    291
    292        /**
    293         * Returns a bounding box from the pool of bounding boxes (this means this box can change after the pool has been
    294         * cleared to be reused)
    295         */
    296        public AxisAlignedBB getCollisionBoundingBoxFromPool(World par1World, int par2, int par3, int par4)
    297        {
    298            this.setBlockBoundsBasedOnState(par1World, par2, par3, par4);
    299            return super.getCollisionBoundingBoxFromPool(par1World, par2, par3, par4);
    300        }
    301
    302        /**
    303         * If this block doesn't render as an ordinary block it will return False (examples: signs, buttons, stairs, etc)
    304         */
    305        public boolean renderAsNormalBlock()
    306        {
    307            return false;
    308        }
    309
    310        /**
    311         * returns an int which describes the direction the piston faces
    312         */
    313        public static int getOrientation(int par0)
    314        {
    315            return par0 & 7;
    316        }
    317
    318        /**
    319         * Determine if the metadata is related to something powered.
    320         */
    321        public static boolean isExtended(int par0)
    322        {
    323            return (par0 & 8) != 0;
    324        }
    325
    326        /**
    327         * gets the way this piston should face for that entity that placed it.
    328         */
    329        public static int determineOrientation(World par0World, int par1, int par2, int par3, EntityPlayer par4EntityPlayer)
    330        {
    331            if (MathHelper.abs((float)par4EntityPlayer.posX - (float)par1) < 2.0F && MathHelper.abs((float)par4EntityPlayer.posZ - (float)par3) < 2.0F)
    332            {
    333                double var5 = par4EntityPlayer.posY + 1.82D - (double)par4EntityPlayer.yOffset;
    334
    335                if (var5 - (double)par2 > 2.0D)
    336                {
    337                    return 1;
    338                }
    339
    340                if ((double)par2 - var5 > 0.0D)
    341                {
    342                    return 0;
    343                }
    344            }
    345
    346            int var7 = MathHelper.floor_double((double)(par4EntityPlayer.rotationYaw * 4.0F / 360.0F) + 0.5D) & 3;
    347            return var7 == 0 ? 2 : (var7 == 1 ? 5 : (var7 == 2 ? 3 : (var7 == 3 ? 4 : 0)));
    348        }
    349
    350        /**
    351         * returns true if the piston can push the specified block
    352         */
    353        private static boolean canPushBlock(int par0, World par1World, int par2, int par3, int par4, boolean par5)
    354        {
    355            if (par0 == Block.obsidian.blockID)
    356            {
    357                return false;
    358            }
    359            else
    360            {
    361                if (par0 != Block.pistonBase.blockID && par0 != Block.pistonStickyBase.blockID)
    362                {
    363                    if (Block.blocksList[par0].getBlockHardness(par1World, par2, par3, par4) == -1.0F)
    364                    {
    365                        return false;
    366                    }
    367
    368                    if (Block.blocksList[par0].getMobilityFlag() == 2)
    369                    {
    370                        return false;
    371                    }
    372
    373                    if (!par5 && Block.blocksList[par0].getMobilityFlag() == 1)
    374                    {
    375                        return false;
    376                    }
    377                }
    378                else if (isExtended(par1World.getBlockMetadata(par2, par3, par4)))
    379                {
    380                    return false;
    381                }
    382
    383                return !par1World.blockHasTileEntity(par2, par3, par4);
    384            }
    385        }
    386
    387        /**
    388         * checks to see if this piston could push the blocks in front of it.
    389         */
    390        private static boolean canExtend(World par0World, int par1, int par2, int par3, int par4)
    391        {
    392            int var5 = par1 + Facing.offsetsXForSide[par4];
    393            int var6 = par2 + Facing.offsetsYForSide[par4];
    394            int var7 = par3 + Facing.offsetsZForSide[par4];
    395            int var8 = 0;
    396
    397            while (true)
    398            {
    399                if (var8 < 13)
    400                {
    401                    if (var6 <= 0 || var6 >= par0World.getHeight() - 1)
    402                    {
    403                        return false;
    404                    }
    405
    406                    int var9 = par0World.getBlockId(var5, var6, var7);
    407
    408                    if (var9 != 0)
    409                    {
    410                        if (!canPushBlock(var9, par0World, var5, var6, var7, true))
    411                        {
    412                            return false;
    413                        }
    414
    415                        if (Block.blocksList[var9].getMobilityFlag() != 1)
    416                        {
    417                            if (var8 == 12)
    418                            {
    419                                return false;
    420                            }
    421
    422                            var5 += Facing.offsetsXForSide[par4];
    423                            var6 += Facing.offsetsYForSide[par4];
    424                            var7 += Facing.offsetsZForSide[par4];
    425                            ++var8;
    426                            continue;
    427                        }
    428                    }
    429                }
    430
    431                return true;
    432            }
    433        }
    434
    435        /**
    436         * attempts to extend the piston. returns false if impossible.
    437         */
    438        private boolean tryExtend(World par1World, int par2, int par3, int par4, int par5)
    439        {
    440            int var6 = par2 + Facing.offsetsXForSide[par5];
    441            int var7 = par3 + Facing.offsetsYForSide[par5];
    442            int var8 = par4 + Facing.offsetsZForSide[par5];
    443            int var9 = 0;
    444
    445            while (true)
    446            {
    447                int var10;
    448
    449                if (var9 < 13)
    450                {
    451                    if (var7 <= 0 || var7 >= par1World.getHeight() - 1)
    452                    {
    453                        return false;
    454                    }
    455
    456                    var10 = par1World.getBlockId(var6, var7, var8);
    457
    458                    if (var10 != 0)
    459                    {
    460                        if (!canPushBlock(var10, par1World, var6, var7, var8, true))
    461                        {
    462                            return false;
    463                        }
    464
    465                        if (Block.blocksList[var10].getMobilityFlag() != 1)
    466                        {
    467                            if (var9 == 12)
    468                            {
    469                                return false;
    470                            }
    471
    472                            var6 += Facing.offsetsXForSide[par5];
    473                            var7 += Facing.offsetsYForSide[par5];
    474                            var8 += Facing.offsetsZForSide[par5];
    475                            ++var9;
    476                            continue;
    477                        }
    478
    479                        Block.blocksList[var10].dropBlockAsItem(par1World, var6, var7, var8, par1World.getBlockMetadata(var6, var7, var8), 0);
    480                        par1World.setBlockWithNotify(var6, var7, var8, 0);
    481                    }
    482                }
    483
    484                while (var6 != par2 || var7 != par3 || var8 != par4)
    485                {
    486                    var9 = var6 - Facing.offsetsXForSide[par5];
    487                    var10 = var7 - Facing.offsetsYForSide[par5];
    488                    int var11 = var8 - Facing.offsetsZForSide[par5];
    489                    int var12 = par1World.getBlockId(var9, var10, var11);
    490                    int var13 = par1World.getBlockMetadata(var9, var10, var11);
    491
    492                    if (var12 == this.blockID && var9 == par2 && var10 == par3 && var11 == par4)
    493                    {
    494                        par1World.setBlockAndMetadataWithUpdate(var6, var7, var8, Block.pistonMoving.blockID, par5 | (this.isSticky ? 8 : 0), false);
    495                        par1World.setBlockTileEntity(var6, var7, var8, BlockPistonMoving.getTileEntity(Block.pistonExtension.blockID, par5 | (this.isSticky ? 8 : 0), par5, true, false));
    496                    }
    497                    else
    498                    {
    499                        par1World.setBlockAndMetadataWithUpdate(var6, var7, var8, Block.pistonMoving.blockID, var13, false);
    500                        par1World.setBlockTileEntity(var6, var7, var8, BlockPistonMoving.getTileEntity(var12, var13, par5, true, false));
    501                    }
    502
    503                    var6 = var9;
    504                    var7 = var10;
    505                    var8 = var11;
    506                }
    507
    508                return true;
    509            }
    510        }
    511    }