    001package net.minecraft.block;
    002
    003import cpw.mods.fml.relauncher.Side;
    004import cpw.mods.fml.relauncher.SideOnly;
    005import java.util.List;
    006import java.util.Random;
    007import net.minecraft.block.material.Material;
    008import net.minecraft.entity.Entity;
    009import net.minecraft.util.AxisAlignedBB;
    010import net.minecraft.util.Facing;
    011import net.minecraft.world.IBlockAccess;
    012import net.minecraft.world.World;
    013
    014public class BlockPistonExtension extends Block
    015{
    016    /** The texture for the 'head' of the piston. Sticky or normal. */
    017    private int headTexture = -1;
    018
    019    public BlockPistonExtension(int par1, int par2)
    020    {
    021        super(par1, par2, Material.piston);
    022        this.setStepSound(soundStoneFootstep);
    023        this.setHardness(0.5F);
    024    }
    025
    026    @SideOnly(Side.CLIENT)
    027    public void setHeadTexture(int par1)
    028    {
    029        this.headTexture = par1;
    030    }
    031
    032    @SideOnly(Side.CLIENT)
    033    public void clearHeadTexture()
    034    {
    035        this.headTexture = -1;
    036    }
    037
    038    /**
    039     * ejects contained items into the world, and notifies neighbours of an update, as appropriate
    040     */
    041    public void breakBlock(World par1World, int par2, int par3, int par4, int par5, int par6)
    042    {
    043        super.breakBlock(par1World, par2, par3, par4, par5, par6);
    044        int var7 = Facing.faceToSide[getDirectionMeta(par6)];
    045        par2 += Facing.offsetsXForSide[var7];
    046        par3 += Facing.offsetsYForSide[var7];
    047        par4 += Facing.offsetsZForSide[var7];
    048        int var8 = par1World.getBlockId(par2, par3, par4);
    049
    050        if (var8 == Block.pistonBase.blockID || var8 == Block.pistonStickyBase.blockID)
    051        {
    052            par6 = par1World.getBlockMetadata(par2, par3, par4);
    053
    054            if (BlockPistonBase.isExtended(par6))
    055            {
    056                Block.blocksList[var8].dropBlockAsItem(par1World, par2, par3, par4, par6, 0);
    057                par1World.setBlockWithNotify(par2, par3, par4, 0);
    058            }
    059        }
    060    }
    061
    062    /**
    063     * From the specified side and block metadata retrieves the blocks texture. Args: side, metadata
    064     */
    065    public int getBlockTextureFromSideAndMetadata(int par1, int par2)
    066    {
    067        int var3 = getDirectionMeta(par2);
    068        return par1 == var3 ? (this.headTexture >= 0 ? this.headTexture : ((par2 & 8) != 0 ? this.blockIndexInTexture - 1 : this.blockIndexInTexture)) : (var3 < 6 && par1 == Facing.faceToSide[var3] ? 107 : 108);
    069    }
    070
    071    /**
    072     * The type of render function that is called for this block
    073     */
    074    public int getRenderType()
    075    {
    076        return 17;
    077    }
    078
    079    /**
    080     * Is this block (a) opaque and (b) a full 1m cube?  This determines whether or not to render the shared face of two
    081     * adjacent blocks and also whether the player can attach torches, redstone wire, etc to this block.
    082     */
    083    public boolean isOpaqueCube()
    084    {
    085        return false;
    086    }
    087
    088    /**
    089     * If this block doesn't render as an ordinary block it will return False (examples: signs, buttons, stairs, etc)
    090     */
    091    public boolean renderAsNormalBlock()
    092    {
    093        return false;
    094    }
    095
    096    /**
    097     * Checks to see if its valid to put this block at the specified coordinates. Args: world, x, y, z
    098     */
    099    public boolean canPlaceBlockAt(World par1World, int par2, int par3, int par4)
    100    {
    101        return false;
    102    }
    103
    104    /**
    105     * checks to see if you can place this block can be placed on that side of a block: BlockLever overrides
    106     */
    107    public boolean canPlaceBlockOnSide(World par1World, int par2, int par3, int par4, int par5)
    108    {
    109        return false;
    110    }
    111
    112    /**
    113     * Returns the quantity of items to drop on block destruction.
    114     */
    115    public int quantityDropped(Random par1Random)
    116    {
    117        return 0;
    118    }
    119
    120    /**
    121     * if the specified block is in the given AABB, add its collision bounding box to the given list
    122     */
    123    public void addCollidingBlockToList(World par1World, int par2, int par3, int par4, AxisAlignedBB par5AxisAlignedBB, List par6List, Entity par7Entity)
    124    {
    125        int var8 = par1World.getBlockMetadata(par2, par3, par4);
    126
    127        switch (getDirectionMeta(var8))
    128        {
    129            case 0:
    130                this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 0.25F, 1.0F);
    131                super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    132                this.setBlockBounds(0.375F, 0.25F, 0.375F, 0.625F, 1.0F, 0.625F);
    133                super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    134                break;
    135            case 1:
    136                this.setBlockBounds(0.0F, 0.75F, 0.0F, 1.0F, 1.0F, 1.0F);
    137                super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    138                this.setBlockBounds(0.375F, 0.0F, 0.375F, 0.625F, 0.75F, 0.625F);
    139                super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    140                break;
    141            case 2:
    142                this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 0.25F);
    143                super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    144                this.setBlockBounds(0.25F, 0.375F, 0.25F, 0.75F, 0.625F, 1.0F);
    145                super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    146                break;
    147            case 3:
    148                this.setBlockBounds(0.0F, 0.0F, 0.75F, 1.0F, 1.0F, 1.0F);
    149                super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    150                this.setBlockBounds(0.25F, 0.375F, 0.0F, 0.75F, 0.625F, 0.75F);
    151                super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    152                break;
    153            case 4:
    154                this.setBlockBounds(0.0F, 0.0F, 0.0F, 0.25F, 1.0F, 1.0F);
    155                super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    156                this.setBlockBounds(0.375F, 0.25F, 0.25F, 0.625F, 0.75F, 1.0F);
    157                super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    158                break;
    159            case 5:
    160                this.setBlockBounds(0.75F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
    161                super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    162                this.setBlockBounds(0.0F, 0.375F, 0.25F, 0.75F, 0.625F, 0.75F);
    163                super.addCollidingBlockToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
    164        }
    165
    166        this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
    167    }
    168
    169    /**
    170     * Updates the blocks bounds based on its current state. Args: world, x, y, z
    171     */
    172    public void setBlockBoundsBasedOnState(IBlockAccess par1IBlockAccess, int par2, int par3, int par4)
    173    {
    174        int var5 = par1IBlockAccess.getBlockMetadata(par2, par3, par4);
    175
    176        switch (getDirectionMeta(var5))
    177        {
    178            case 0:
    179                this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 0.25F, 1.0F);
    180                break;
    181            case 1:
    182                this.setBlockBounds(0.0F, 0.75F, 0.0F, 1.0F, 1.0F, 1.0F);
    183                break;
    184            case 2:
    185                this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 0.25F);
    186                break;
    187            case 3:
    188                this.setBlockBounds(0.0F, 0.0F, 0.75F, 1.0F, 1.0F, 1.0F);
    189                break;
    190            case 4:
    191                this.setBlockBounds(0.0F, 0.0F, 0.0F, 0.25F, 1.0F, 1.0F);
    192                break;
    193            case 5:
    194                this.setBlockBounds(0.75F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
    195        }
    196    }
    197
    198    /**
    199     * Lets the block know when one of its neighbor changes. Doesn't know which neighbor changed (coordinates passed are
    200     * their own) Args: x, y, z, neighbor blockID
    201     */
    202    public void onNeighborBlockChange(World par1World, int par2, int par3, int par4, int par5)
    203    {
    204        int var6 = getDirectionMeta(par1World.getBlockMetadata(par2, par3, par4));
    205        int var7 = par1World.getBlockId(par2 - Facing.offsetsXForSide[var6], par3 - Facing.offsetsYForSide[var6], par4 - Facing.offsetsZForSide[var6]);
    206
    207        if (var7 != Block.pistonBase.blockID && var7 != Block.pistonStickyBase.blockID)
    208        {
    209            par1World.setBlockWithNotify(par2, par3, par4, 0);
    210        }
    211        else
    212        {
    213            Block.blocksList[var7].onNeighborBlockChange(par1World, par2 - Facing.offsetsXForSide[var6], par3 - Facing.offsetsYForSide[var6], par4 - Facing.offsetsZForSide[var6], par5);
    214        }
    215    }
    216
    217    public static int getDirectionMeta(int par0)
    218    {
    219        return par0 & 7;
    220    }
    221
    222    @SideOnly(Side.CLIENT)
    223
    224    /**
    225     * only called by clickMiddleMouseButton , and passed to inventory.setCurrentItem (along with isCreative)
    226     */
    227    public int idPicked(World par1World, int par2, int par3, int par4)
    228    {
    229        return 0;
    230    }
    231}