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    }