    001package net.minecraft.block;
    002
    003import cpw.mods.fml.relauncher.Side;
    004import cpw.mods.fml.relauncher.SideOnly;
    005import java.util.List;
    006import net.minecraft.block.material.Material;
    007import net.minecraft.creativetab.CreativeTabs;
    008import net.minecraft.entity.Entity;
    009import net.minecraft.entity.EntityLiving;
    010import net.minecraft.entity.player.EntityPlayer;
    011import net.minecraft.tileentity.TileEntity;
    012import net.minecraft.tileentity.TileEntityPiston;
    013import net.minecraft.util.AxisAlignedBB;
    014import net.minecraft.util.Facing;
    015import net.minecraft.util.MathHelper;
    016import net.minecraft.world.IBlockAccess;
    017import net.minecraft.world.World;
    018
    019public 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}