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.client.renderer.texture.IconRegister;
008import net.minecraft.creativetab.CreativeTabs;
009import net.minecraft.entity.Entity;
010import net.minecraft.entity.EntityLiving;
011import net.minecraft.entity.player.EntityPlayer;
012import net.minecraft.item.ItemStack;
013import net.minecraft.tileentity.TileEntity;
014import net.minecraft.tileentity.TileEntityPiston;
015import net.minecraft.util.AxisAlignedBB;
016import net.minecraft.util.Facing;
017import net.minecraft.util.Icon;
018import net.minecraft.util.MathHelper;
019import net.minecraft.world.IBlockAccess;
020import net.minecraft.world.World;
021
022public class BlockPistonBase extends Block
023{
024    /** This pistons is the sticky one? */
025    private final boolean isSticky;
026    @SideOnly(Side.CLIENT)
027    private Icon field_94498_b;
028    @SideOnly(Side.CLIENT)
029    private Icon field_94499_c;
030    @SideOnly(Side.CLIENT)
031    private Icon field_94497_cO;
032
033    public BlockPistonBase(int par1, boolean par2)
034    {
035        super(par1, Material.piston);
036        this.isSticky = par2;
037        this.setStepSound(soundStoneFootstep);
038        this.setHardness(0.5F);
039        this.setCreativeTab(CreativeTabs.tabRedstone);
040    }
041
042    @SideOnly(Side.CLIENT)
043
044    /**
045     * Return the either 106 or 107 as the texture index depending on the isSticky flag. This will actually never get
046     * called by TileEntityRendererPiston.renderPiston() because TileEntityPiston.shouldRenderHead() will always return
047     * false.
048     */
049    public Icon getPistonExtensionTexture()
050    {
051        return this.field_94497_cO;
052    }
053
054    @SideOnly(Side.CLIENT)
055    public void func_96479_b(float par1, float par2, float par3, float par4, float par5, float par6)
056    {
057        this.setBlockBounds(par1, par2, par3, par4, par5, par6);
058    }
059
060    @SideOnly(Side.CLIENT)
061
062    /**
063     * From the specified side and block metadata retrieves the blocks texture. Args: side, metadata
064     */
065    public Icon getBlockTextureFromSideAndMetadata(int par1, int par2)
066    {
067        int k = getOrientation(par2);
068        return k > 5 ? this.field_94497_cO : (par1 == k ? (!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.field_94497_cO : this.field_94498_b) : (par1 == Facing.faceToSide[k] ? this.field_94499_c : this.blockIcon));
069    }
070
071    @SideOnly(Side.CLIENT)
072    public static Icon func_94496_b(String par0Str)
073    {
074        return par0Str == "piston_side" ? Block.pistonBase.blockIcon : (par0Str == "piston_top" ? Block.pistonBase.field_94497_cO : (par0Str == "piston_top_sticky" ? Block.pistonStickyBase.field_94497_cO : (par0Str == "piston_inner_top" ? Block.pistonBase.field_94498_b : null)));
075    }
076
077    @SideOnly(Side.CLIENT)
078
079    /**
080     * When this method is called, your block should register all the icons it needs with the given IconRegister. This
081     * is the only chance you get to register icons.
082     */
083    public void registerIcons(IconRegister par1IconRegister)
084    {
085        this.blockIcon = par1IconRegister.registerIcon("piston_side");
086        this.field_94497_cO = par1IconRegister.registerIcon(this.isSticky ? "piston_top_sticky" : "piston_top");
087        this.field_94498_b = par1IconRegister.registerIcon("piston_inner_top");
088        this.field_94499_c = par1IconRegister.registerIcon("piston_bottom");
089    }
090
091    /**
092     * The type of render function that is called for this block
093     */
094    public int getRenderType()
095    {
096        return 16;
097    }
098
099    /**
100     * Is this block (a) opaque and (b) a full 1m cube?  This determines whether or not to render the shared face of two
101     * adjacent blocks and also whether the player can attach torches, redstone wire, etc to this block.
102     */
103    public boolean isOpaqueCube()
104    {
105        return false;
106    }
107
108    /**
109     * Called upon block activation (right click on the block.)
110     */
111    public boolean onBlockActivated(World par1World, int par2, int par3, int par4, EntityPlayer par5EntityPlayer, int par6, float par7, float par8, float par9)
112    {
113        return false;
114    }
115
116    /**
117     * Called when the block is placed in the world.
118     */
119    public void onBlockPlacedBy(World par1World, int par2, int par3, int par4, EntityLiving par5EntityLiving, ItemStack par6ItemStack)
120    {
121        int l = determineOrientation(par1World, par2, par3, par4, par5EntityLiving);
122        par1World.setBlockMetadataWithNotify(par2, par3, par4, l, 2);
123
124        if (!par1World.isRemote)
125        {
126            this.updatePistonState(par1World, par2, par3, par4);
127        }
128    }
129
130    /**
131     * Lets the block know when one of its neighbor changes. Doesn't know which neighbor changed (coordinates passed are
132     * their own) Args: x, y, z, neighbor blockID
133     */
134    public void onNeighborBlockChange(World par1World, int par2, int par3, int par4, int par5)
135    {
136        if (!par1World.isRemote)
137        {
138            this.updatePistonState(par1World, par2, par3, par4);
139        }
140    }
141
142    /**
143     * Called whenever the block is added into the world. Args: world, x, y, z
144     */
145    public void onBlockAdded(World par1World, int par2, int par3, int par4)
146    {
147        if (!par1World.isRemote && par1World.getBlockTileEntity(par2, par3, par4) == null)
148        {
149            this.updatePistonState(par1World, par2, par3, par4);
150        }
151    }
152
153    /**
154     * handles attempts to extend or retract the piston.
155     */
156    private void updatePistonState(World par1World, int par2, int par3, int par4)
157    {
158        int l = par1World.getBlockMetadata(par2, par3, par4);
159        int i1 = getOrientation(l);
160
161        if (i1 != 7)
162        {
163            boolean flag = this.isIndirectlyPowered(par1World, par2, par3, par4, i1);
164
165            if (flag && !isExtended(l))
166            {
167                if (canExtend(par1World, par2, par3, par4, i1))
168                {
169                    par1World.addBlockEvent(par2, par3, par4, this.blockID, 0, i1);
170                }
171            }
172            else if (!flag && isExtended(l))
173            {
174                par1World.setBlockMetadataWithNotify(par2, par3, par4, i1, 2);
175                par1World.addBlockEvent(par2, par3, par4, this.blockID, 1, i1);
176            }
177        }
178    }
179
180    /**
181     * checks the block to that side to see if it is indirectly powered.
182     */
183    private boolean isIndirectlyPowered(World par1World, int par2, int par3, int par4, int par5)
184    {
185        return par5 != 0 && par1World.getIndirectPowerOutput(par2, par3 - 1, par4, 0) ? true : (par5 != 1 && par1World.getIndirectPowerOutput(par2, par3 + 1, par4, 1) ? true : (par5 != 2 && par1World.getIndirectPowerOutput(par2, par3, par4 - 1, 2) ? true : (par5 != 3 && par1World.getIndirectPowerOutput(par2, par3, par4 + 1, 3) ? true : (par5 != 5 && par1World.getIndirectPowerOutput(par2 + 1, par3, par4, 5) ? true : (par5 != 4 && par1World.getIndirectPowerOutput(par2 - 1, par3, par4, 4) ? true : (par1World.getIndirectPowerOutput(par2, par3, par4, 0) ? true : (par1World.getIndirectPowerOutput(par2, par3 + 2, par4, 1) ? true : (par1World.getIndirectPowerOutput(par2, par3 + 1, par4 - 1, 2) ? true : (par1World.getIndirectPowerOutput(par2, par3 + 1, par4 + 1, 3) ? true : (par1World.getIndirectPowerOutput(par2 - 1, par3 + 1, par4, 4) ? true : par1World.getIndirectPowerOutput(par2 + 1, par3 + 1, par4, 5)))))))))));
186    }
187
188    /**
189     * Called when the block receives a BlockEvent - see World.addBlockEvent. By default, passes it on to the tile
190     * entity at this location. Args: world, x, y, z, blockID, EventID, event parameter
191     */
192    public boolean onBlockEventReceived(World par1World, int par2, int par3, int par4, int par5, int par6)
193    {
194        if (!par1World.isRemote)
195        {
196            boolean flag = this.isIndirectlyPowered(par1World, par2, par3, par4, par6);
197
198            if (flag && par5 == 1)
199            {
200                par1World.setBlockMetadataWithNotify(par2, par3, par4, par6 | 8, 2);
201                return false;
202            }
203
204            if (!flag && par5 == 0)
205            {
206                return false;
207            }
208        }
209
210        if (par5 == 0)
211        {
212            if (!this.tryExtend(par1World, par2, par3, par4, par6))
213            {
214                return false;
215            }
216
217            par1World.setBlockMetadataWithNotify(par2, par3, par4, par6 | 8, 2);
218            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);
219        }
220        else if (par5 == 1)
221        {
222            TileEntity tileentity = par1World.getBlockTileEntity(par2 + Facing.offsetsXForSide[par6], par3 + Facing.offsetsYForSide[par6], par4 + Facing.offsetsZForSide[par6]);
223
224            if (tileentity instanceof TileEntityPiston)
225            {
226                ((TileEntityPiston)tileentity).clearPistonTileEntity();
227            }
228
229            par1World.setBlock(par2, par3, par4, Block.pistonMoving.blockID, par6, 3);
230            par1World.setBlockTileEntity(par2, par3, par4, BlockPistonMoving.getTileEntity(this.blockID, par6, par6, false, true));
231
232            if (this.isSticky)
233            {
234                int j1 = par2 + Facing.offsetsXForSide[par6] * 2;
235                int k1 = par3 + Facing.offsetsYForSide[par6] * 2;
236                int l1 = par4 + Facing.offsetsZForSide[par6] * 2;
237                int i2 = par1World.getBlockId(j1, k1, l1);
238                int j2 = par1World.getBlockMetadata(j1, k1, l1);
239                boolean flag1 = false;
240
241                if (i2 == Block.pistonMoving.blockID)
242                {
243                    TileEntity tileentity1 = par1World.getBlockTileEntity(j1, k1, l1);
244
245                    if (tileentity1 instanceof TileEntityPiston)
246                    {
247                        TileEntityPiston tileentitypiston = (TileEntityPiston)tileentity1;
248
249                        if (tileentitypiston.getPistonOrientation() == par6 && tileentitypiston.isExtending())
250                        {
251                            tileentitypiston.clearPistonTileEntity();
252                            i2 = tileentitypiston.getStoredBlockID();
253                            j2 = tileentitypiston.getBlockMetadata();
254                            flag1 = true;
255                        }
256                    }
257                }
258
259                if (!flag1 && i2 > 0 && canPushBlock(i2, par1World, j1, k1, l1, false) && (Block.blocksList[i2].getMobilityFlag() == 0 || i2 == Block.pistonBase.blockID || i2 == Block.pistonStickyBase.blockID))
260                {
261                    par2 += Facing.offsetsXForSide[par6];
262                    par3 += Facing.offsetsYForSide[par6];
263                    par4 += Facing.offsetsZForSide[par6];
264                    par1World.setBlock(par2, par3, par4, Block.pistonMoving.blockID, j2, 3);
265                    par1World.setBlockTileEntity(par2, par3, par4, BlockPistonMoving.getTileEntity(i2, j2, par6, false, false));
266                    par1World.setBlockToAir(j1, k1, l1);
267                }
268                else if (!flag1)
269                {
270                    par1World.setBlockToAir(par2 + Facing.offsetsXForSide[par6], par3 + Facing.offsetsYForSide[par6], par4 + Facing.offsetsZForSide[par6]);
271                }
272            }
273            else
274            {
275                par1World.setBlockToAir(par2 + Facing.offsetsXForSide[par6], par3 + Facing.offsetsYForSide[par6], par4 + Facing.offsetsZForSide[par6]);
276            }
277
278            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);
279        }
280
281        return true;
282    }
283
284    /**
285     * Updates the blocks bounds based on its current state. Args: world, x, y, z
286     */
287    public void setBlockBoundsBasedOnState(IBlockAccess par1IBlockAccess, int par2, int par3, int par4)
288    {
289        int l = par1IBlockAccess.getBlockMetadata(par2, par3, par4);
290
291        if (isExtended(l))
292        {
293            switch (getOrientation(l))
294            {
295                case 0:
296                    this.setBlockBounds(0.0F, 0.25F, 0.0F, 1.0F, 1.0F, 1.0F);
297                    break;
298                case 1:
299                    this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 0.75F, 1.0F);
300                    break;
301                case 2:
302                    this.setBlockBounds(0.0F, 0.0F, 0.25F, 1.0F, 1.0F, 1.0F);
303                    break;
304                case 3:
305                    this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 0.75F);
306                    break;
307                case 4:
308                    this.setBlockBounds(0.25F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
309                    break;
310                case 5:
311                    this.setBlockBounds(0.0F, 0.0F, 0.0F, 0.75F, 1.0F, 1.0F);
312            }
313        }
314        else
315        {
316            this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
317        }
318    }
319
320    /**
321     * Sets the block's bounds for rendering it as an item
322     */
323    public void setBlockBoundsForItemRender()
324    {
325        this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
326    }
327
328    /**
329     * Adds all intersecting collision boxes to a list. (Be sure to only add boxes to the list if they intersect the
330     * mask.) Parameters: World, X, Y, Z, mask, list, colliding entity
331     */
332    public void addCollisionBoxesToList(World par1World, int par2, int par3, int par4, AxisAlignedBB par5AxisAlignedBB, List par6List, Entity par7Entity)
333    {
334        this.setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
335        super.addCollisionBoxesToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
336    }
337
338    /**
339     * Returns a bounding box from the pool of bounding boxes (this means this box can change after the pool has been
340     * cleared to be reused)
341     */
342    public AxisAlignedBB getCollisionBoundingBoxFromPool(World par1World, int par2, int par3, int par4)
343    {
344        this.setBlockBoundsBasedOnState(par1World, par2, par3, par4);
345        return super.getCollisionBoundingBoxFromPool(par1World, par2, par3, par4);
346    }
347
348    /**
349     * If this block doesn't render as an ordinary block it will return False (examples: signs, buttons, stairs, etc)
350     */
351    public boolean renderAsNormalBlock()
352    {
353        return false;
354    }
355
356    /**
357     * returns an int which describes the direction the piston faces
358     */
359    public static int getOrientation(int par0)
360    {
361        return par0 & 7;
362    }
363
364    /**
365     * Determine if the metadata is related to something powered.
366     */
367    public static boolean isExtended(int par0)
368    {
369        return (par0 & 8) != 0;
370    }
371
372    /**
373     * gets the way this piston should face for that entity that placed it.
374     */
375    public static int determineOrientation(World par0World, int par1, int par2, int par3, EntityLiving par4EntityLiving)
376    {
377        if (MathHelper.abs((float)par4EntityLiving.posX - (float)par1) < 2.0F && MathHelper.abs((float)par4EntityLiving.posZ - (float)par3) < 2.0F)
378        {
379            double d0 = par4EntityLiving.posY + 1.82D - (double)par4EntityLiving.yOffset;
380
381            if (d0 - (double)par2 > 2.0D)
382            {
383                return 1;
384            }
385
386            if ((double)par2 - d0 > 0.0D)
387            {
388                return 0;
389            }
390        }
391
392        int l = MathHelper.floor_double((double)(par4EntityLiving.rotationYaw * 4.0F / 360.0F) + 0.5D) & 3;
393        return l == 0 ? 2 : (l == 1 ? 5 : (l == 2 ? 3 : (l == 3 ? 4 : 0)));
394    }
395
396    /**
397     * returns true if the piston can push the specified block
398     */
399    private static boolean canPushBlock(int par0, World par1World, int par2, int par3, int par4, boolean par5)
400    {
401        if (par0 == Block.obsidian.blockID)
402        {
403            return false;
404        }
405        else
406        {
407            if (par0 != Block.pistonBase.blockID && par0 != Block.pistonStickyBase.blockID)
408            {
409                if (Block.blocksList[par0].getBlockHardness(par1World, par2, par3, par4) == -1.0F)
410                {
411                    return false;
412                }
413
414                if (Block.blocksList[par0].getMobilityFlag() == 2)
415                {
416                    return false;
417                }
418
419                if (Block.blocksList[par0].getMobilityFlag() == 1)
420                {
421                    if (!par5)
422                    {
423                        return false;
424                    }
425
426                    return true;
427                }
428            }
429            else if (isExtended(par1World.getBlockMetadata(par2, par3, par4)))
430            {
431                return false;
432            }
433
434            return !par1World.blockHasTileEntity(par2, par3, par4);
435        }
436    }
437
438    /**
439     * checks to see if this piston could push the blocks in front of it.
440     */
441    private static boolean canExtend(World par0World, int par1, int par2, int par3, int par4)
442    {
443        int i1 = par1 + Facing.offsetsXForSide[par4];
444        int j1 = par2 + Facing.offsetsYForSide[par4];
445        int k1 = par3 + Facing.offsetsZForSide[par4];
446        int l1 = 0;
447
448        while (true)
449        {
450            if (l1 < 13)
451            {
452                if (j1 <= 0 || j1 >= par0World.getHeight() - 1)
453                {
454                    return false;
455                }
456
457                int i2 = par0World.getBlockId(i1, j1, k1);
458
459                if (i2 != 0)
460                {
461                    if (!canPushBlock(i2, par0World, i1, j1, k1, true))
462                    {
463                        return false;
464                    }
465
466                    if (Block.blocksList[i2].getMobilityFlag() != 1)
467                    {
468                        if (l1 == 12)
469                        {
470                            return false;
471                        }
472
473                        i1 += Facing.offsetsXForSide[par4];
474                        j1 += Facing.offsetsYForSide[par4];
475                        k1 += Facing.offsetsZForSide[par4];
476                        ++l1;
477                        continue;
478                    }
479                }
480            }
481
482            return true;
483        }
484    }
485
486    /**
487     * attempts to extend the piston. returns false if impossible.
488     */
489    private boolean tryExtend(World par1World, int par2, int par3, int par4, int par5)
490    {
491        int i1 = par2 + Facing.offsetsXForSide[par5];
492        int j1 = par3 + Facing.offsetsYForSide[par5];
493        int k1 = par4 + Facing.offsetsZForSide[par5];
494        int l1 = 0;
495
496        while (true)
497        {
498            int i2;
499
500            if (l1 < 13)
501            {
502                if (j1 <= 0 || j1 >= par1World.getHeight() - 1)
503                {
504                    return false;
505                }
506
507                i2 = par1World.getBlockId(i1, j1, k1);
508
509                if (i2 != 0)
510                {
511                    if (!canPushBlock(i2, par1World, i1, j1, k1, true))
512                    {
513                        return false;
514                    }
515
516                    if (Block.blocksList[i2].getMobilityFlag() != 1)
517                    {
518                        if (l1 == 12)
519                        {
520                            return false;
521                        }
522
523                        i1 += Facing.offsetsXForSide[par5];
524                        j1 += Facing.offsetsYForSide[par5];
525                        k1 += Facing.offsetsZForSide[par5];
526                        ++l1;
527                        continue;
528                    }
529
530                    //With our change to how snowballs are dropped this needs to dissallow to mimic vanilla behavior.
531                    float chance = (Block.blocksList[i2] instanceof BlockSnow ? -1.0f : 1.0f);
532                    Block.blocksList[i2].dropBlockAsItemWithChance(par1World, i1, j1, k1, par1World.getBlockMetadata(i1, j1, k1), chance, 0);
533                    par1World.setBlockToAir(i1, j1, k1);
534                }
535            }
536
537            l1 = i1;
538            i2 = j1;
539            int j2 = k1;
540            int k2 = 0;
541            int[] aint;
542            int l2;
543            int i3;
544            int j3;
545
546            for (aint = new int[13]; i1 != par2 || j1 != par3 || k1 != par4; k1 = j3)
547            {
548                l2 = i1 - Facing.offsetsXForSide[par5];
549                i3 = j1 - Facing.offsetsYForSide[par5];
550                j3 = k1 - Facing.offsetsZForSide[par5];
551                int k3 = par1World.getBlockId(l2, i3, j3);
552                int l3 = par1World.getBlockMetadata(l2, i3, j3);
553
554                if (k3 == this.blockID && l2 == par2 && i3 == par3 && j3 == par4)
555                {
556                    par1World.setBlock(i1, j1, k1, Block.pistonMoving.blockID, par5 | (this.isSticky ? 8 : 0), 4);
557                    par1World.setBlockTileEntity(i1, j1, k1, BlockPistonMoving.getTileEntity(Block.pistonExtension.blockID, par5 | (this.isSticky ? 8 : 0), par5, true, false));
558                }
559                else
560                {
561                    par1World.setBlock(i1, j1, k1, Block.pistonMoving.blockID, l3, 4);
562                    par1World.setBlockTileEntity(i1, j1, k1, BlockPistonMoving.getTileEntity(k3, l3, par5, true, false));
563                }
564
565                aint[k2++] = k3;
566                i1 = l2;
567                j1 = i3;
568            }
569
570            i1 = l1;
571            j1 = i2;
572            k1 = j2;
573
574            for (k2 = 0; i1 != par2 || j1 != par3 || k1 != par4; k1 = j3)
575            {
576                l2 = i1 - Facing.offsetsXForSide[par5];
577                i3 = j1 - Facing.offsetsYForSide[par5];
578                j3 = k1 - Facing.offsetsZForSide[par5];
579                par1World.notifyBlocksOfNeighborChange(l2, i3, j3, aint[k2++]);
580                i1 = l2;
581                j1 = i3;
582            }
583
584            return true;
585        }
586    }
587}