001    package net.minecraft.src;
002    
003    import cpw.mods.fml.common.Side;
004    import cpw.mods.fml.common.asm.SideOnly;
005    
006    import java.util.ArrayList;
007    import java.util.List;
008    import net.minecraftforge.common.IMinecartCollisionHandler;
009    import net.minecraftforge.common.MinecartRegistry;
010    import net.minecraftforge.common.MinecraftForge;
011    import net.minecraftforge.event.entity.minecart.MinecartCollisionEvent;
012    import net.minecraftforge.event.entity.minecart.MinecartInteractEvent;
013    import net.minecraftforge.event.entity.minecart.MinecartUpdateEvent;
014    
015    public class EntityMinecart extends Entity implements IInventory
016    {
017        /** Array of item stacks stored in minecart (for storage minecarts). */
018        protected ItemStack[] cargoItems;
019        protected int fuel;
020        protected boolean field_70499_f;
021    
022        /** The type of minecart, 2 for powered, 1 for storage. */
023        public int minecartType;
024        public double pushX;
025        public double pushZ;
026        protected final IUpdatePlayerListBox field_82344_g;
027        protected boolean field_82345_h;
028        protected static final int[][][] field_70500_g = new int[][][] {{{0, 0, -1}, {0, 0, 1}}, {{ -1, 0, 0}, {1, 0, 0}}, {{ -1, -1, 0}, {1, 0, 0}}, {{ -1, 0, 0}, {1, -1, 0}}, {{0, 0, -1}, {0, -1, 1}}, {{0, -1, -1}, {0, 0, 1}}, {{0, 0, 1}, {1, 0, 0}}, {{0, 0, 1}, { -1, 0, 0}}, {{0, 0, -1}, { -1, 0, 0}}, {{0, 0, -1}, {1, 0, 0}}};
029    
030        /** appears to be the progress of the turn */
031        protected int turnProgress;
032        protected double minecartX;
033        protected double minecartY;
034        protected double minecartZ;
035        protected double minecartYaw;
036        protected double minecartPitch;
037        @SideOnly(Side.CLIENT)
038        protected double velocityX;
039        @SideOnly(Side.CLIENT)
040        protected double velocityY;
041        @SideOnly(Side.CLIENT)
042        protected double velocityZ;
043    
044        /* Forge: Minecart Compatibility Layer Integration. */
045        public static float defaultMaxSpeedRail = 0.4f;
046        public static float defaultMaxSpeedGround = 0.4f;
047        public static float defaultMaxSpeedAirLateral = 0.4f;
048        public static float defaultMaxSpeedAirVertical = -1f;
049        public static double defaultDragRidden = 0.996999979019165D;
050        public static double defaultDragEmpty = 0.9599999785423279D;
051        public static double defaultDragAir = 0.94999998807907104D;
052        protected boolean canUseRail = true;
053        protected boolean canBePushed = true;
054        private static IMinecartCollisionHandler collisionHandler = null;
055    
056        /* Instance versions of the above physics properties */
057        protected float maxSpeedRail;
058        protected float maxSpeedGround;
059        protected float maxSpeedAirLateral;
060        protected float maxSpeedAirVertical;
061        protected double dragAir;
062    
063        public EntityMinecart(World par1World)
064        {
065            super(par1World);
066            this.cargoItems = new ItemStack[36];
067            this.fuel = 0;
068            this.field_70499_f = false;
069            this.field_82345_h = true;
070            this.preventEntitySpawning = true;
071            this.setSize(0.98F, 0.7F);
072            this.yOffset = this.height / 2.0F;
073            this.field_82344_g = par1World != null ? par1World.func_82735_a(this) : null;
074    
075            maxSpeedRail = defaultMaxSpeedRail;
076            maxSpeedGround = defaultMaxSpeedGround;
077            maxSpeedAirLateral = defaultMaxSpeedAirLateral;
078            maxSpeedAirVertical = defaultMaxSpeedAirVertical;
079            dragAir = defaultDragAir;
080        }
081    
082        public EntityMinecart(World world, int type)
083        {
084            this(world);
085            minecartType = type;
086        }
087    
088        /**
089         * returns if this entity triggers Block.onEntityWalking on the blocks they walk on. used for spiders and wolves to
090         * prevent them from trampling crops
091         */
092        protected boolean canTriggerWalking()
093        {
094            return false;
095        }
096    
097        protected void entityInit()
098        {
099            this.dataWatcher.addObject(16, new Byte((byte)0));
100            this.dataWatcher.addObject(17, new Integer(0));
101            this.dataWatcher.addObject(18, new Integer(1));
102            this.dataWatcher.addObject(19, new Integer(0));
103        }
104    
105        /**
106         * Returns a boundingBox used to collide the entity with other entities and blocks. This enables the entity to be
107         * pushable on contact, like boats or minecarts.
108         */
109        public AxisAlignedBB getCollisionBox(Entity par1Entity)
110        {
111            if (getCollisionHandler() != null)
112            {
113                return getCollisionHandler().getCollisionBox(this, par1Entity);
114            }
115            return par1Entity.canBePushed() ? par1Entity.boundingBox : null;
116        }
117    
118        /**
119         * returns the bounding box for this entity
120         */
121        public AxisAlignedBB getBoundingBox()
122        {
123            if (getCollisionHandler() != null)
124            {
125                return getCollisionHandler().getBoundingBox(this);
126            }
127            return null;
128        }
129    
130        /**
131         * Returns true if this entity should push and be pushed by other entities when colliding.
132         */
133        public boolean canBePushed()
134        {
135            return canBePushed;
136        }
137    
138        public EntityMinecart(World par1World, double par2, double par4, double par6, int par8)
139        {
140            this(par1World);
141            this.setPosition(par2, par4 + (double)this.yOffset, par6);
142            this.motionX = 0.0D;
143            this.motionY = 0.0D;
144            this.motionZ = 0.0D;
145            this.prevPosX = par2;
146            this.prevPosY = par4;
147            this.prevPosZ = par6;
148            this.minecartType = par8;
149        }
150    
151        /**
152         * Returns the Y offset from the entity's position for any entity riding this one.
153         */
154        public double getMountedYOffset()
155        {
156            return (double)this.height * 0.0D - 0.30000001192092896D;
157        }
158    
159        /**
160         * Called when the entity is attacked.
161         */
162        public boolean attackEntityFrom(DamageSource par1DamageSource, int par2)
163        {
164            if (!this.worldObj.isRemote && !this.isDead)
165            {
166                if (this.func_85032_ar())
167                {
168                    return false;
169                }
170                else
171                {
172                    this.func_70494_i(-this.func_70493_k());
173                    this.func_70497_h(10);
174                    this.setBeenAttacked();
175                    this.setDamage(this.getDamage() + par2 * 10);
176    
177                    if (par1DamageSource.getEntity() instanceof EntityPlayer && ((EntityPlayer)par1DamageSource.getEntity()).capabilities.isCreativeMode)
178                    {
179                        this.setDamage(100);
180                    }
181    
182                    if (this.getDamage() > 40)
183                    {
184                        if (this.riddenByEntity != null)
185                        {
186                            this.riddenByEntity.mountEntity(this);
187                        }
188    
189                        this.setDead();
190                        dropCartAsItem();
191                    }
192    
193                    return true;
194                }
195            }
196            else
197            {
198                return true;
199            }
200        }
201    
202        @SideOnly(Side.CLIENT)
203    
204        /**
205         * Setups the entity to do the hurt animation. Only used by packets in multiplayer.
206         */
207        public void performHurtAnimation()
208        {
209            this.func_70494_i(-this.func_70493_k());
210            this.func_70497_h(10);
211            this.setDamage(this.getDamage() + this.getDamage() * 10);
212        }
213    
214        /**
215         * Returns true if other Entities should be prevented from moving through this Entity.
216         */
217        public boolean canBeCollidedWith()
218        {
219            return !this.isDead;
220        }
221    
222        /**
223         * Will get destroyed next tick.
224         */
225        public void setDead()
226        {
227            if (this.field_82345_h)
228            {
229                for (int var1 = 0; var1 < this.getSizeInventory(); ++var1)
230                {
231                    ItemStack var2 = this.getStackInSlot(var1);
232    
233                    if (var2 != null)
234                    {
235                        float var3 = this.rand.nextFloat() * 0.8F + 0.1F;
236                        float var4 = this.rand.nextFloat() * 0.8F + 0.1F;
237                        float var5 = this.rand.nextFloat() * 0.8F + 0.1F;
238    
239                        while (var2.stackSize > 0)
240                        {
241                            int var6 = this.rand.nextInt(21) + 10;
242    
243                            if (var6 > var2.stackSize)
244                            {
245                                var6 = var2.stackSize;
246                            }
247    
248                            var2.stackSize -= var6;
249                            EntityItem var7 = new EntityItem(this.worldObj, this.posX + (double)var3, this.posY + (double)var4, this.posZ + (double)var5, new ItemStack(var2.itemID, var6, var2.getItemDamage()));
250    
251                            if (var2.hasTagCompound())
252                            {
253                                var7.item.setTagCompound((NBTTagCompound)var2.getTagCompound().copy());
254                            }
255    
256                            float var8 = 0.05F;
257                            var7.motionX = (double)((float)this.rand.nextGaussian() * var8);
258                            var7.motionY = (double)((float)this.rand.nextGaussian() * var8 + 0.2F);
259                            var7.motionZ = (double)((float)this.rand.nextGaussian() * var8);
260                            this.worldObj.spawnEntityInWorld(var7);
261                        }
262                    }
263                }
264            }
265    
266            super.setDead();
267    
268            if (this.field_82344_g != null)
269            {
270                this.field_82344_g.update();
271            }
272        }
273    
274        /**
275         * Teleports the entity to another dimension. Params: Dimension number to teleport to
276         */
277        public void travelToDimension(int par1)
278        {
279            this.field_82345_h = false;
280            super.travelToDimension(par1);
281        }
282    
283        /**
284         * Called to update the entity's position/logic.
285         */
286        public void onUpdate()
287        {
288            if (this.field_82344_g != null)
289            {
290                this.field_82344_g.update();
291            }
292    
293            if (this.func_70496_j() > 0)
294            {
295                this.func_70497_h(this.func_70496_j() - 1);
296            }
297    
298            if (this.getDamage() > 0)
299            {
300                this.setDamage(this.getDamage() - 1);
301            }
302    
303            if (this.posY < -64.0D)
304            {
305                this.kill();
306            }
307    
308            if (this.isMinecartPowered() && this.rand.nextInt(4) == 0 && minecartType == 2 && getClass() == EntityMinecart.class)
309            {
310                this.worldObj.spawnParticle("largesmoke", this.posX, this.posY + 0.8D, this.posZ, 0.0D, 0.0D, 0.0D);
311            }
312    
313            if (this.worldObj.isRemote)
314            {
315                if (this.turnProgress > 0)
316                {
317                    double var45 = this.posX + (this.minecartX - this.posX) / (double)this.turnProgress;
318                    double var46 = this.posY + (this.minecartY - this.posY) / (double)this.turnProgress;
319                    double var5 = this.posZ + (this.minecartZ - this.posZ) / (double)this.turnProgress;
320                    double var7 = MathHelper.wrapAngleTo180_double(this.minecartYaw - (double)this.rotationYaw);
321                    this.rotationYaw = (float)((double)this.rotationYaw + var7 / (double)this.turnProgress);
322                    this.rotationPitch = (float)((double)this.rotationPitch + (this.minecartPitch - (double)this.rotationPitch) / (double)this.turnProgress);
323                    --this.turnProgress;
324                    this.setPosition(var45, var46, var5);
325                    this.setRotation(this.rotationYaw, this.rotationPitch);
326                }
327                else
328                {
329                    this.setPosition(this.posX, this.posY, this.posZ);
330                    this.setRotation(this.rotationYaw, this.rotationPitch);
331                }
332            }
333            else
334            {
335                this.prevPosX = this.posX;
336                this.prevPosY = this.posY;
337                this.prevPosZ = this.posZ;
338                this.motionY -= 0.03999999910593033D;
339                int var1 = MathHelper.floor_double(this.posX);
340                int var2 = MathHelper.floor_double(this.posY);
341                int var3 = MathHelper.floor_double(this.posZ);
342    
343                if (BlockRail.isRailBlockAt(this.worldObj, var1, var2 - 1, var3))
344                {
345                    --var2;
346                }
347    
348                double var4 = 0.4D;
349                double var6 = 0.0078125D;
350                int var8 = this.worldObj.getBlockId(var1, var2, var3);
351    
352                if (canUseRail() && BlockRail.isRailBlock(var8))
353                {
354                    this.fallDistance = 0.0F;
355                    Vec3 var9 = this.func_70489_a(this.posX, this.posY, this.posZ);
356                    int var10 = ((BlockRail)Block.blocksList[var8]).getBasicRailMetadata(worldObj, this, var1, var2, var3);
357                    this.posY = (double)var2;
358                    boolean var11 = false;
359                    boolean var12 = false;
360    
361                    if (var8 == Block.railPowered.blockID)
362                    {
363                        var11 = (worldObj.getBlockMetadata(var1, var2, var3) & 8) != 0;
364                        var12 = !var11;
365                    }
366    
367                    if (((BlockRail)Block.blocksList[var8]).isPowered())
368                    {
369                        var10 &= 7;
370                    }
371    
372                    if (var10 >= 2 && var10 <= 5)
373                    {
374                        this.posY = (double)(var2 + 1);
375                    }
376    
377                    adjustSlopeVelocities(var10);
378    
379                    int[][] var13 = field_70500_g[var10];
380                    double var14 = (double)(var13[1][0] - var13[0][0]);
381                    double var16 = (double)(var13[1][2] - var13[0][2]);
382                    double var18 = Math.sqrt(var14 * var14 + var16 * var16);
383                    double var20 = this.motionX * var14 + this.motionZ * var16;
384    
385                    if (var20 < 0.0D)
386                    {
387                        var14 = -var14;
388                        var16 = -var16;
389                    }
390    
391                    double var22 = Math.sqrt(this.motionX * this.motionX + this.motionZ * this.motionZ);
392                    this.motionX = var22 * var14 / var18;
393                    this.motionZ = var22 * var16 / var18;
394                    double var24;
395                    double var26;
396    
397                    if (this.riddenByEntity != null)
398                    {
399                        var24 = this.riddenByEntity.motionX * this.riddenByEntity.motionX + this.riddenByEntity.motionZ * this.riddenByEntity.motionZ;
400                        var26 = this.motionX * this.motionX + this.motionZ * this.motionZ;
401    
402                        if (var24 > 1.0E-4D && var26 < 0.01D)
403                        {
404                            this.motionX += this.riddenByEntity.motionX * 0.1D;
405                            this.motionZ += this.riddenByEntity.motionZ * 0.1D;
406                            var12 = false;
407                        }
408                    }
409    
410                    if (var12 && shouldDoRailFunctions())
411                    {
412                        var24 = Math.sqrt(this.motionX * this.motionX + this.motionZ * this.motionZ);
413    
414                        if (var24 < 0.03D)
415                        {
416                            this.motionX *= 0.0D;
417                            this.motionY *= 0.0D;
418                            this.motionZ *= 0.0D;
419                        }
420                        else
421                        {
422                            this.motionX *= 0.5D;
423                            this.motionY *= 0.0D;
424                            this.motionZ *= 0.5D;
425                        }
426                    }
427    
428                    var24 = 0.0D;
429                    var26 = (double)var1 + 0.5D + (double)var13[0][0] * 0.5D;
430                    double var28 = (double)var3 + 0.5D + (double)var13[0][2] * 0.5D;
431                    double var30 = (double)var1 + 0.5D + (double)var13[1][0] * 0.5D;
432                    double var32 = (double)var3 + 0.5D + (double)var13[1][2] * 0.5D;
433                    var14 = var30 - var26;
434                    var16 = var32 - var28;
435                    double var34;
436                    double var36;
437    
438                    if (var14 == 0.0D)
439                    {
440                        this.posX = (double)var1 + 0.5D;
441                        var24 = this.posZ - (double)var3;
442                    }
443                    else if (var16 == 0.0D)
444                    {
445                        this.posZ = (double)var3 + 0.5D;
446                        var24 = this.posX - (double)var1;
447                    }
448                    else
449                    {
450                        var34 = this.posX - var26;
451                        var36 = this.posZ - var28;
452                        var24 = (var34 * var14 + var36 * var16) * 2.0D;
453                    }
454    
455                    this.posX = var26 + var14 * var24;
456                    this.posZ = var28 + var16 * var24;
457                    this.setPosition(this.posX, this.posY + (double)this.yOffset, this.posZ);
458    
459                    moveMinecartOnRail(var1, var2, var3);
460    
461                    if (var13[0][1] != 0 && MathHelper.floor_double(this.posX) - var1 == var13[0][0] && MathHelper.floor_double(this.posZ) - var3 == var13[0][2])
462                    {
463                        this.setPosition(this.posX, this.posY + (double)var13[0][1], this.posZ);
464                    }
465                    else if (var13[1][1] != 0 && MathHelper.floor_double(this.posX) - var1 == var13[1][0] && MathHelper.floor_double(this.posZ) - var3 == var13[1][2])
466                    {
467                        this.setPosition(this.posX, this.posY + (double)var13[1][1], this.posZ);
468                    }
469    
470                    applyDragAndPushForces();
471    
472                    Vec3 var52 = this.func_70489_a(this.posX, this.posY, this.posZ);
473    
474                    if (var52 != null && var9 != null)
475                    {
476                        double var39 = (var9.yCoord - var52.yCoord) * 0.05D;
477                        var22 = Math.sqrt(this.motionX * this.motionX + this.motionZ * this.motionZ);
478    
479                        if (var22 > 0.0D)
480                        {
481                            this.motionX = this.motionX / var22 * (var22 + var39);
482                            this.motionZ = this.motionZ / var22 * (var22 + var39);
483                        }
484    
485                        this.setPosition(this.posX, var52.yCoord, this.posZ);
486                    }
487    
488                    int var51 = MathHelper.floor_double(this.posX);
489                    int var53 = MathHelper.floor_double(this.posZ);
490    
491                    if (var51 != var1 || var53 != var3)
492                    {
493                        var22 = Math.sqrt(this.motionX * this.motionX + this.motionZ * this.motionZ);
494                        this.motionX = var22 * (double)(var51 - var1);
495                        this.motionZ = var22 * (double)(var53 - var3);
496                    }
497    
498                    double var41;
499    
500                    updatePushForces();
501    
502                    if(shouldDoRailFunctions())
503                    {
504                        ((BlockRail)Block.blocksList[var8]).onMinecartPass(worldObj, this, var1, var2, var3);
505                    }
506    
507                    if (var11 && shouldDoRailFunctions())
508                    {
509                        var41 = Math.sqrt(this.motionX * this.motionX + this.motionZ * this.motionZ);
510    
511                        if (var41 > 0.01D)
512                        {
513                            double var43 = 0.06D;
514                            this.motionX += this.motionX / var41 * var43;
515                            this.motionZ += this.motionZ / var41 * var43;
516                        }
517                        else if (var10 == 1)
518                        {
519                            if (this.worldObj.isBlockNormalCube(var1 - 1, var2, var3))
520                            {
521                                this.motionX = 0.02D;
522                            }
523                            else if (this.worldObj.isBlockNormalCube(var1 + 1, var2, var3))
524                            {
525                                this.motionX = -0.02D;
526                            }
527                        }
528                        else if (var10 == 0)
529                        {
530                            if (this.worldObj.isBlockNormalCube(var1, var2, var3 - 1))
531                            {
532                                this.motionZ = 0.02D;
533                            }
534                            else if (this.worldObj.isBlockNormalCube(var1, var2, var3 + 1))
535                            {
536                                this.motionZ = -0.02D;
537                            }
538                        }
539                    }
540                }
541                else
542                {
543                    moveMinecartOffRail(var1, var2, var3);
544                }
545    
546                this.doBlockCollisions();
547                this.rotationPitch = 0.0F;
548                double var47 = this.prevPosX - this.posX;
549                double var48 = this.prevPosZ - this.posZ;
550    
551                if (var47 * var47 + var48 * var48 > 0.001D)
552                {
553                    this.rotationYaw = (float)(Math.atan2(var48, var47) * 180.0D / Math.PI);
554    
555                    if (this.field_70499_f)
556                    {
557                        this.rotationYaw += 180.0F;
558                    }
559                }
560    
561                double var49 = (double)MathHelper.wrapAngleTo180_float(this.rotationYaw - this.prevRotationYaw);
562    
563                if (var49 < -170.0D || var49 >= 170.0D)
564                {
565                    this.rotationYaw += 180.0F;
566                    this.field_70499_f = !this.field_70499_f;
567                }
568    
569                this.setRotation(this.rotationYaw, this.rotationPitch);
570    
571                AxisAlignedBB box = null;
572                if (getCollisionHandler() != null)
573                {
574                    box = getCollisionHandler().getMinecartCollisionBox(this);
575                }
576                else
577                {
578                    box = boundingBox.expand(0.2D, 0.0D, 0.2D);
579                }
580    
581                List var15 = this.worldObj.getEntitiesWithinAABBExcludingEntity(this, box);
582    
583                if (var15 != null && !var15.isEmpty())
584                {
585                    for (int var50 = 0; var50 < var15.size(); ++var50)
586                    {
587                        Entity var17 = (Entity)var15.get(var50);
588    
589                        if (var17 != this.riddenByEntity && var17.canBePushed() && var17 instanceof EntityMinecart)
590                        {
591                            var17.applyEntityCollision(this);
592                        }
593                    }
594                }
595    
596                if (this.riddenByEntity != null && this.riddenByEntity.isDead)
597                {
598                    if (this.riddenByEntity.ridingEntity == this)
599                    {
600                        this.riddenByEntity.ridingEntity = null;
601                    }
602    
603                    this.riddenByEntity = null;
604                }
605    
606                updateFuel();
607                MinecraftForge.EVENT_BUS.post(new MinecartUpdateEvent(this, var1, var2, var3));
608            }
609        }
610    
611        @SideOnly(Side.CLIENT)
612        public Vec3 func_70495_a(double par1, double par3, double par5, double par7)
613        {
614            int var9 = MathHelper.floor_double(par1);
615            int var10 = MathHelper.floor_double(par3);
616            int var11 = MathHelper.floor_double(par5);
617    
618            if (BlockRail.isRailBlockAt(this.worldObj, var9, var10 - 1, var11))
619            {
620                --var10;
621            }
622    
623            int var12 = this.worldObj.getBlockId(var9, var10, var11);
624    
625            if (!BlockRail.isRailBlock(var12))
626            {
627                return null;
628            }
629            else
630            {
631                int var13 = ((BlockRail)Block.blocksList[var12]).getBasicRailMetadata(worldObj, this, var9, var10, var11);
632    
633                par3 = (double)var10;
634    
635                if (var13 >= 2 && var13 <= 5)
636                {
637                    par3 = (double)(var10 + 1);
638                }
639    
640                int[][] var14 = field_70500_g[var13];
641                double var15 = (double)(var14[1][0] - var14[0][0]);
642                double var17 = (double)(var14[1][2] - var14[0][2]);
643                double var19 = Math.sqrt(var15 * var15 + var17 * var17);
644                var15 /= var19;
645                var17 /= var19;
646                par1 += var15 * par7;
647                par5 += var17 * par7;
648    
649                if (var14[0][1] != 0 && MathHelper.floor_double(par1) - var9 == var14[0][0] && MathHelper.floor_double(par5) - var11 == var14[0][2])
650                {
651                    par3 += (double)var14[0][1];
652                }
653                else if (var14[1][1] != 0 && MathHelper.floor_double(par1) - var9 == var14[1][0] && MathHelper.floor_double(par5) - var11 == var14[1][2])
654                {
655                    par3 += (double)var14[1][1];
656                }
657    
658                return this.func_70489_a(par1, par3, par5);
659            }
660        }
661    
662        public Vec3 func_70489_a(double par1, double par3, double par5)
663        {
664            int var7 = MathHelper.floor_double(par1);
665            int var8 = MathHelper.floor_double(par3);
666            int var9 = MathHelper.floor_double(par5);
667    
668            if (BlockRail.isRailBlockAt(this.worldObj, var7, var8 - 1, var9))
669            {
670                --var8;
671            }
672    
673            int var10 = this.worldObj.getBlockId(var7, var8, var9);
674    
675            if (BlockRail.isRailBlock(var10))
676            {
677                int var11 = ((BlockRail)Block.blocksList[var10]).getBasicRailMetadata(worldObj, this, var7, var8, var9);
678                par3 = (double)var8;
679    
680                if (var11 >= 2 && var11 <= 5)
681                {
682                    par3 = (double)(var8 + 1);
683                }
684    
685                int[][] var12 = field_70500_g[var11];
686                double var13 = 0.0D;
687                double var15 = (double)var7 + 0.5D + (double)var12[0][0] * 0.5D;
688                double var17 = (double)var8 + 0.5D + (double)var12[0][1] * 0.5D;
689                double var19 = (double)var9 + 0.5D + (double)var12[0][2] * 0.5D;
690                double var21 = (double)var7 + 0.5D + (double)var12[1][0] * 0.5D;
691                double var23 = (double)var8 + 0.5D + (double)var12[1][1] * 0.5D;
692                double var25 = (double)var9 + 0.5D + (double)var12[1][2] * 0.5D;
693                double var27 = var21 - var15;
694                double var29 = (var23 - var17) * 2.0D;
695                double var31 = var25 - var19;
696    
697                if (var27 == 0.0D)
698                {
699                    par1 = (double)var7 + 0.5D;
700                    var13 = par5 - (double)var9;
701                }
702                else if (var31 == 0.0D)
703                {
704                    par5 = (double)var9 + 0.5D;
705                    var13 = par1 - (double)var7;
706                }
707                else
708                {
709                    double var33 = par1 - var15;
710                    double var35 = par5 - var19;
711                    var13 = (var33 * var27 + var35 * var31) * 2.0D;
712                }
713    
714                par1 = var15 + var27 * var13;
715                par3 = var17 + var29 * var13;
716                par5 = var19 + var31 * var13;
717    
718                if (var29 < 0.0D)
719                {
720                    ++par3;
721                }
722    
723                if (var29 > 0.0D)
724                {
725                    par3 += 0.5D;
726                }
727    
728                return this.worldObj.getWorldVec3Pool().getVecFromPool(par1, par3, par5);
729            }
730            else
731            {
732                return null;
733            }
734        }
735    
736        /**
737         * (abstract) Protected helper method to write subclass entity data to NBT.
738         */
739        protected void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
740        {
741            par1NBTTagCompound.setInteger("Type", this.minecartType);
742    
743            if (isPoweredCart())
744            {
745                par1NBTTagCompound.setDouble("PushX", this.pushX);
746                par1NBTTagCompound.setDouble("PushZ", this.pushZ);
747                par1NBTTagCompound.setInteger("Fuel", this.fuel);
748            }
749    
750            if (getSizeInventory() > 0)
751            {
752                NBTTagList var2 = new NBTTagList();
753    
754                for (int var3 = 0; var3 < this.cargoItems.length; ++var3)
755                {
756                    if (this.cargoItems[var3] != null)
757                    {
758                        NBTTagCompound var4 = new NBTTagCompound();
759                        var4.setByte("Slot", (byte)var3);
760                        this.cargoItems[var3].writeToNBT(var4);
761                        var2.appendTag(var4);
762                    }
763                }
764    
765                par1NBTTagCompound.setTag("Items", var2);
766            }
767        }
768    
769        /**
770         * (abstract) Protected helper method to read subclass entity data from NBT.
771         */
772        protected void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
773        {
774            this.minecartType = par1NBTTagCompound.getInteger("Type");
775    
776            if (isPoweredCart())
777            {
778                this.pushX = par1NBTTagCompound.getDouble("PushX");
779                this.pushZ = par1NBTTagCompound.getDouble("PushZ");
780                try
781                {
782                    this.fuel = par1NBTTagCompound.getInteger("Fuel");
783                }
784                catch (ClassCastException e)
785                {
786                    this.fuel = par1NBTTagCompound.getShort("Fuel");
787                }
788            }
789    
790            if (getSizeInventory() > 0)
791            {
792                NBTTagList var2 = par1NBTTagCompound.getTagList("Items");
793                this.cargoItems = new ItemStack[this.getSizeInventory()];
794    
795                for (int var3 = 0; var3 < var2.tagCount(); ++var3)
796                {
797                    NBTTagCompound var4 = (NBTTagCompound)var2.tagAt(var3);
798                    int var5 = var4.getByte("Slot") & 255;
799    
800                    if (var5 >= 0 && var5 < this.cargoItems.length)
801                    {
802                        this.cargoItems[var5] = ItemStack.loadItemStackFromNBT(var4);
803                    }
804                }
805            }
806        }
807    
808        @SideOnly(Side.CLIENT)
809        public float getShadowSize()
810        {
811            return 0.0F;
812        }
813    
814        /**
815         * Applies a velocity to each of the entities pushing them away from each other. Args: entity
816         */
817        public void applyEntityCollision(Entity par1Entity)
818        {
819            MinecraftForge.EVENT_BUS.post(new MinecartCollisionEvent(this, par1Entity));
820            if (getCollisionHandler() != null)
821            {
822                getCollisionHandler().onEntityCollision(this, par1Entity);
823                return;
824            }
825            if (!this.worldObj.isRemote)
826            {
827                if (par1Entity != this.riddenByEntity)
828                {
829                    if (par1Entity instanceof EntityLiving && !(par1Entity instanceof EntityPlayer) && !(par1Entity instanceof EntityIronGolem) && canBeRidden() && this.motionX * this.motionX + this.motionZ * this.motionZ > 0.01D && this.riddenByEntity == null && par1Entity.ridingEntity == null)
830                    {
831                        par1Entity.mountEntity(this);
832                    }
833    
834                    double var2 = par1Entity.posX - this.posX;
835                    double var4 = par1Entity.posZ - this.posZ;
836                    double var6 = var2 * var2 + var4 * var4;
837    
838                    if (var6 >= 9.999999747378752E-5D)
839                    {
840                        var6 = (double)MathHelper.sqrt_double(var6);
841                        var2 /= var6;
842                        var4 /= var6;
843                        double var8 = 1.0D / var6;
844    
845                        if (var8 > 1.0D)
846                        {
847                            var8 = 1.0D;
848                        }
849    
850                        var2 *= var8;
851                        var4 *= var8;
852                        var2 *= 0.10000000149011612D;
853                        var4 *= 0.10000000149011612D;
854                        var2 *= (double)(1.0F - this.entityCollisionReduction);
855                        var4 *= (double)(1.0F - this.entityCollisionReduction);
856                        var2 *= 0.5D;
857                        var4 *= 0.5D;
858    
859                        if (par1Entity instanceof EntityMinecart)
860                        {
861                            double var10 = par1Entity.posX - this.posX;
862                            double var12 = par1Entity.posZ - this.posZ;
863                            Vec3 var14 = this.worldObj.getWorldVec3Pool().getVecFromPool(var10, 0.0D, var12).normalize();
864                            Vec3 var15 = this.worldObj.getWorldVec3Pool().getVecFromPool((double)MathHelper.cos(this.rotationYaw * (float)Math.PI / 180.0F), 0.0D, (double)MathHelper.sin(this.rotationYaw * (float)Math.PI / 180.0F)).normalize();
865                            double var16 = Math.abs(var14.dotProduct(var15));
866    
867                            if (var16 < 0.800000011920929D)
868                            {
869                                return;
870                            }
871    
872                            double var18 = par1Entity.motionX + this.motionX;
873                            double var20 = par1Entity.motionZ + this.motionZ;
874    
875                            if (((EntityMinecart)par1Entity).isPoweredCart() && !isPoweredCart())
876                            {
877                                this.motionX *= 0.20000000298023224D;
878                                this.motionZ *= 0.20000000298023224D;
879                                this.addVelocity(par1Entity.motionX - var2, 0.0D, par1Entity.motionZ - var4);
880                                par1Entity.motionX *= 0.949999988079071D;
881                                par1Entity.motionZ *= 0.949999988079071D;
882                            }
883                            else if (!((EntityMinecart)par1Entity).isPoweredCart() && isPoweredCart())
884                            {
885                                par1Entity.motionX *= 0.20000000298023224D;
886                                par1Entity.motionZ *= 0.20000000298023224D;
887                                par1Entity.addVelocity(this.motionX + var2, 0.0D, this.motionZ + var4);
888                                this.motionX *= 0.949999988079071D;
889                                this.motionZ *= 0.949999988079071D;
890                            }
891                            else
892                            {
893                                var18 /= 2.0D;
894                                var20 /= 2.0D;
895                                this.motionX *= 0.20000000298023224D;
896                                this.motionZ *= 0.20000000298023224D;
897                                this.addVelocity(var18 - var2, 0.0D, var20 - var4);
898                                par1Entity.motionX *= 0.20000000298023224D;
899                                par1Entity.motionZ *= 0.20000000298023224D;
900                                par1Entity.addVelocity(var18 + var2, 0.0D, var20 + var4);
901                            }
902                        }
903                        else
904                        {
905                            this.addVelocity(-var2, 0.0D, -var4);
906                            par1Entity.addVelocity(var2 / 4.0D, 0.0D, var4 / 4.0D);
907                        }
908                    }
909                }
910            }
911        }
912    
913        /**
914         * Returns the number of slots in the inventory.
915         */
916        public int getSizeInventory()
917        {
918            return (minecartType == 1 && getClass() == EntityMinecart.class ? 27 : 0);
919        }
920    
921        /**
922         * Returns the stack in slot i
923         */
924        public ItemStack getStackInSlot(int par1)
925        {
926            return this.cargoItems[par1];
927        }
928    
929        /**
930         * Removes from an inventory slot (first arg) up to a specified number (second arg) of items and returns them in a
931         * new stack.
932         */
933        public ItemStack decrStackSize(int par1, int par2)
934        {
935            if (this.cargoItems[par1] != null)
936            {
937                ItemStack var3;
938    
939                if (this.cargoItems[par1].stackSize <= par2)
940                {
941                    var3 = this.cargoItems[par1];
942                    this.cargoItems[par1] = null;
943                    return var3;
944                }
945                else
946                {
947                    var3 = this.cargoItems[par1].splitStack(par2);
948    
949                    if (this.cargoItems[par1].stackSize == 0)
950                    {
951                        this.cargoItems[par1] = null;
952                    }
953    
954                    return var3;
955                }
956            }
957            else
958            {
959                return null;
960            }
961        }
962    
963        /**
964         * When some containers are closed they call this on each slot, then drop whatever it returns as an EntityItem -
965         * like when you close a workbench GUI.
966         */
967        public ItemStack getStackInSlotOnClosing(int par1)
968        {
969            if (this.cargoItems[par1] != null)
970            {
971                ItemStack var2 = this.cargoItems[par1];
972                this.cargoItems[par1] = null;
973                return var2;
974            }
975            else
976            {
977                return null;
978            }
979        }
980    
981        /**
982         * Sets the given item stack to the specified slot in the inventory (can be crafting or armor sections).
983         */
984        public void setInventorySlotContents(int par1, ItemStack par2ItemStack)
985        {
986            this.cargoItems[par1] = par2ItemStack;
987    
988            if (par2ItemStack != null && par2ItemStack.stackSize > this.getInventoryStackLimit())
989            {
990                par2ItemStack.stackSize = this.getInventoryStackLimit();
991            }
992        }
993    
994        /**
995         * Returns the name of the inventory.
996         */
997        public String getInvName()
998        {
999            return "container.minecart";
1000        }
1001    
1002        /**
1003         * Returns the maximum stack size for a inventory slot. Seems to always be 64, possibly will be extended. *Isn't
1004         * this more of a set than a get?*
1005         */
1006        public int getInventoryStackLimit()
1007        {
1008            return 64;
1009        }
1010    
1011        /**
1012         * Called when an the contents of an Inventory change, usually
1013         */
1014        public void onInventoryChanged() {}
1015    
1016        /**
1017         * Called when a player interacts with a mob. e.g. gets milk from a cow, gets into the saddle on a pig.
1018         */
1019        public boolean interact(EntityPlayer par1EntityPlayer)
1020        {
1021            if (MinecraftForge.EVENT_BUS.post(new MinecartInteractEvent(this, par1EntityPlayer)))
1022            {
1023                return true;
1024            }
1025    
1026            if (canBeRidden())
1027            {
1028                if (this.riddenByEntity != null && this.riddenByEntity instanceof EntityPlayer && this.riddenByEntity != par1EntityPlayer)
1029                {
1030                    return true;
1031                }
1032    
1033                if (!this.worldObj.isRemote)
1034                {
1035                    par1EntityPlayer.mountEntity(this);
1036                }
1037            }
1038            else if (getSizeInventory() > 0)
1039            {
1040                if (!this.worldObj.isRemote)
1041                {
1042                    par1EntityPlayer.displayGUIChest(this);
1043                }
1044            }
1045            else if (this.minecartType == 2 && getClass() == EntityMinecart.class)
1046            {
1047                ItemStack var2 = par1EntityPlayer.inventory.getCurrentItem();
1048    
1049                if (var2 != null && var2.itemID == Item.coal.shiftedIndex)
1050                {
1051                    if (--var2.stackSize == 0)
1052                    {
1053                        par1EntityPlayer.inventory.setInventorySlotContents(par1EntityPlayer.inventory.currentItem, (ItemStack)null);
1054                    }
1055    
1056                    this.fuel += 3600;
1057                }
1058    
1059                this.pushX = this.posX - par1EntityPlayer.posX;
1060                this.pushZ = this.posZ - par1EntityPlayer.posZ;
1061            }
1062    
1063            return true;
1064        }
1065    
1066        @SideOnly(Side.CLIENT)
1067    
1068        /**
1069         * Sets the position and rotation. Only difference from the other one is no bounding on the rotation. Args: posX,
1070         * posY, posZ, yaw, pitch
1071         */
1072        public void setPositionAndRotation2(double par1, double par3, double par5, float par7, float par8, int par9)
1073        {
1074            this.minecartX = par1;
1075            this.minecartY = par3;
1076            this.minecartZ = par5;
1077            this.minecartYaw = (double)par7;
1078            this.minecartPitch = (double)par8;
1079            this.turnProgress = par9 + 2;
1080            this.motionX = this.velocityX;
1081            this.motionY = this.velocityY;
1082            this.motionZ = this.velocityZ;
1083        }
1084    
1085        /**
1086         * Do not make give this method the name canInteractWith because it clashes with Container
1087         */
1088        public boolean isUseableByPlayer(EntityPlayer par1EntityPlayer)
1089        {
1090            return this.isDead ? false : par1EntityPlayer.getDistanceSqToEntity(this) <= 64.0D;
1091        }
1092    
1093        @SideOnly(Side.CLIENT)
1094    
1095        /**
1096         * Sets the velocity to the args. Args: x, y, z
1097         */
1098        public void setVelocity(double par1, double par3, double par5)
1099        {
1100            this.velocityX = this.motionX = par1;
1101            this.velocityY = this.motionY = par3;
1102            this.velocityZ = this.motionZ = par5;
1103        }
1104    
1105        /**
1106         * Is this minecart powered (Fuel > 0)
1107         */
1108        public boolean isMinecartPowered()
1109        {
1110            return (this.dataWatcher.getWatchableObjectByte(16) & 1) != 0;
1111        }
1112    
1113        /**
1114         * Set if this minecart is powered (Fuel > 0)
1115         */
1116        protected void setMinecartPowered(boolean par1)
1117        {
1118            if (par1)
1119            {
1120                this.dataWatcher.updateObject(16, Byte.valueOf((byte)(this.dataWatcher.getWatchableObjectByte(16) | 1)));
1121            }
1122            else
1123            {
1124                this.dataWatcher.updateObject(16, Byte.valueOf((byte)(this.dataWatcher.getWatchableObjectByte(16) & -2)));
1125            }
1126        }
1127    
1128        public void openChest() {}
1129    
1130        public void closeChest() {}
1131    
1132        /**
1133         * Sets the current amount of damage the minecart has taken. Decreases over time. The cart breaks when this is over
1134         * 40.
1135         */
1136        public void setDamage(int par1)
1137        {
1138            this.dataWatcher.updateObject(19, Integer.valueOf(par1));
1139        }
1140    
1141        /**
1142         * Gets the current amount of damage the minecart has taken. Decreases over time. The cart breaks when this is over
1143         * 40.
1144         */
1145        public int getDamage()
1146        {
1147            return this.dataWatcher.getWatchableObjectInt(19);
1148        }
1149    
1150        public void func_70497_h(int par1)
1151        {
1152            this.dataWatcher.updateObject(17, Integer.valueOf(par1));
1153        }
1154    
1155        public int func_70496_j()
1156        {
1157            return this.dataWatcher.getWatchableObjectInt(17);
1158        }
1159    
1160        public void func_70494_i(int par1)
1161        {
1162            this.dataWatcher.updateObject(18, Integer.valueOf(par1));
1163        }
1164    
1165        public int func_70493_k()
1166        {
1167            return this.dataWatcher.getWatchableObjectInt(18);
1168        }
1169    
1170        /**
1171         * Drops the cart as a item. The exact item dropped is defined by getItemDropped().
1172         */
1173        public void dropCartAsItem()
1174        {
1175            for(ItemStack item : getItemsDropped())
1176            {
1177                entityDropItem(item, 0);
1178            }
1179        }
1180    
1181        /**
1182         * Override this to define which items your cart drops when broken.
1183         * This does not include items contained in the inventory,
1184         * that is handled elsewhere.
1185         * @return A list of items dropped.
1186         */
1187        public List<ItemStack> getItemsDropped()
1188        {
1189            List<ItemStack> items = new ArrayList<ItemStack>();
1190            items.add(new ItemStack(Item.minecartEmpty));
1191    
1192            switch(minecartType)
1193            {
1194                case 1:
1195                    items.add(new ItemStack(Block.chest));
1196                    break;
1197                case 2:
1198                    items.add(new ItemStack(Block.stoneOvenIdle));
1199                    break;
1200            }
1201            return items;
1202        }
1203    
1204        /**
1205         * This function returns an ItemStack that represents this cart.
1206         * This should be an ItemStack that can be used by the player to place the cart.
1207         * This is the item that was registered with the cart via the registerMinecart function,
1208         * but is not necessary the item the cart drops when destroyed.
1209         * @return An ItemStack that can be used to place the cart.
1210         */
1211        public ItemStack getCartItem()
1212        {
1213            return MinecartRegistry.getItemForCart(this);
1214        }
1215    
1216        /**
1217         * Returns true if this cart is self propelled.
1218         * @return True if powered.
1219         */
1220        public boolean isPoweredCart()
1221        {
1222            return minecartType == 2 && getClass() == EntityMinecart.class;
1223        }
1224    
1225        /**
1226         * Returns true if this cart is a storage cart
1227         * Some carts may have inventories but not be storage carts
1228         * and some carts without inventories may be storage carts.
1229         * @return True if this cart should be classified as a storage cart.
1230         */
1231        public boolean isStorageCart()
1232        {
1233            return minecartType == 1 && getClass() == EntityMinecart.class;
1234        }
1235    
1236        /**
1237         * Returns true if this cart can be ridden by an Entity.
1238         * @return True if this cart can be ridden.
1239         */
1240        public boolean canBeRidden()
1241        {
1242            if(minecartType == 0 && getClass() == EntityMinecart.class)
1243            {
1244                return true;
1245            }
1246            return false;
1247        }
1248    
1249        /**
1250         * Returns true if this cart can currently use rails.
1251         * This function is mainly used to gracefully detach a minecart from a rail.
1252         * @return True if the minecart can use rails.
1253         */
1254        public boolean canUseRail()
1255        {
1256            return canUseRail;
1257        }
1258    
1259        /**
1260         * Set whether the minecart can use rails.
1261         * This function is mainly used to gracefully detach a minecart from a rail.
1262         * @param use Whether the minecart can currently use rails.
1263         */
1264        public void setCanUseRail(boolean use)
1265        {
1266            canUseRail = use;
1267        }
1268    
1269        /**
1270         * Return false if this cart should not call IRail.onMinecartPass() and should ignore Powered Rails.
1271         * @return True if this cart should call IRail.onMinecartPass().
1272         */
1273        public boolean shouldDoRailFunctions()
1274        {
1275            return true;
1276        }
1277    
1278        /**
1279         * Simply returns the minecartType variable.
1280         * @return minecartType
1281         */
1282        public int getMinecartType()
1283        {
1284            return minecartType;
1285        }
1286    
1287        /**
1288         * Gets the current global Minecart Collision handler if none
1289         * is registered, returns null
1290         * @return The collision handler or null
1291         */
1292        public static IMinecartCollisionHandler getCollisionHandler()
1293        {
1294            return collisionHandler;
1295        }
1296    
1297        /**
1298         * Sets the global Minecart Collision handler, overwrites any
1299         * that is currently set.
1300         * @param handler The new handler
1301         */
1302        public static void setCollisionHandler(IMinecartCollisionHandler handler)
1303        {
1304            collisionHandler = handler;
1305        }
1306    
1307        /**
1308         * Carts should return their drag factor here
1309         * @return The drag rate.
1310         */
1311        protected double getDrag()
1312        {
1313            return riddenByEntity != null ? defaultDragRidden : defaultDragEmpty;
1314        }
1315    
1316        /**
1317         * Moved to allow overrides.
1318         * This code applies drag and updates push forces.
1319         */
1320        protected void applyDragAndPushForces()
1321        {
1322            if(isPoweredCart())
1323            {
1324                double d27 = MathHelper.sqrt_double(pushX * pushX + pushZ * pushZ);
1325                if(d27 > 0.01D)
1326                {
1327                    pushX /= d27;
1328                    pushZ /= d27;
1329                    double d29 = 0.04;
1330                    motionX *= 0.8D;
1331                    motionY *= 0.0D;
1332                    motionZ *= 0.8D;
1333                    motionX += pushX * d29;
1334                    motionZ += pushZ * d29;
1335                }
1336                else
1337                {
1338                    motionX *= 0.9D;
1339                    motionY *= 0.0D;
1340                    motionZ *= 0.9D;
1341                }
1342            }
1343            motionX *= getDrag();
1344            motionY *= 0.0D;
1345            motionZ *= getDrag();
1346        }
1347    
1348        /**
1349         * Moved to allow overrides.
1350         * This code updates push forces.
1351         */
1352        protected void updatePushForces()
1353        {
1354            if(isPoweredCart())
1355            {
1356                double push = MathHelper.sqrt_double(pushX * pushX + pushZ * pushZ);
1357                if(push > 0.01D && motionX * motionX + motionZ * motionZ > 0.001D)
1358                {
1359                    pushX /= push;
1360                    pushZ /= push;
1361                    if(pushX * motionX + pushZ * motionZ < 0.0D)
1362                    {
1363                        pushX = 0.0D;
1364                        pushZ = 0.0D;
1365                    }
1366                    else
1367                    {
1368                        pushX = motionX;
1369                        pushZ = motionZ;
1370                    }
1371                }
1372            }
1373        }
1374    
1375        /**
1376         * Moved to allow overrides.
1377         * This code handles minecart movement and speed capping when on a rail.
1378         */
1379        protected void moveMinecartOnRail(int i, int j, int k)
1380        {
1381            int id = worldObj.getBlockId(i, j, k);
1382            if (!BlockRail.isRailBlock(id))
1383            {
1384                    return;
1385            }
1386            float railMaxSpeed = ((BlockRail)Block.blocksList[id]).getRailMaxSpeed(worldObj, this, i, j, k);
1387    
1388            double maxSpeed = Math.min(railMaxSpeed, getMaxSpeedRail());
1389            double mX = motionX;
1390            double mZ = motionZ;
1391            if(riddenByEntity != null)
1392            {
1393                mX *= 0.75D;
1394                mZ *= 0.75D;
1395            }
1396            if(mX < -maxSpeed) mX = -maxSpeed;
1397            if(mX >  maxSpeed) mX =  maxSpeed;
1398            if(mZ < -maxSpeed) mZ = -maxSpeed;
1399            if(mZ >  maxSpeed) mZ =  maxSpeed;
1400            moveEntity(mX, 0.0D, mZ);
1401        }
1402    
1403        /**
1404         * Moved to allow overrides.
1405         * This code handles minecart movement and speed capping when not on a rail.
1406         */
1407        protected void moveMinecartOffRail(int i, int j, int k)
1408        {
1409            double d2 = getMaxSpeedGround();
1410            if(!onGround)
1411            {
1412                d2 = getMaxSpeedAirLateral();
1413            }
1414            if(motionX < -d2) motionX = -d2;
1415            if(motionX >  d2) motionX =  d2;
1416            if(motionZ < -d2) motionZ = -d2;
1417            if(motionZ >  d2) motionZ =  d2;
1418            double moveY = motionY;
1419            if(getMaxSpeedAirVertical() > 0 && motionY > getMaxSpeedAirVertical())
1420            {
1421                moveY = getMaxSpeedAirVertical();
1422                if(Math.abs(motionX) < 0.3f && Math.abs(motionZ) < 0.3f)
1423                {
1424                    moveY = 0.15f;
1425                    motionY = moveY;
1426                }
1427            }
1428            if(onGround)
1429            {
1430                motionX *= 0.5D;
1431                motionY *= 0.5D;
1432                motionZ *= 0.5D;
1433            }
1434            moveEntity(motionX, moveY, motionZ);
1435            if(!onGround)
1436            {
1437                motionX *= getDragAir();
1438                motionY *= getDragAir();
1439                motionZ *= getDragAir();
1440            }
1441        }
1442    
1443        /**
1444         * Moved to allow overrides.
1445         * This code applies fuel consumption.
1446         */
1447        protected void updateFuel()
1448        {
1449            if (fuel > 0) fuel--;
1450            if (fuel <= 0) pushX = pushZ = 0.0D;
1451            setMinecartPowered(fuel > 0);
1452        }
1453    
1454        /**
1455         * Moved to allow overrides, This code handle slopes affecting velocity.
1456         * @param metadata The blocks position metadata
1457         */
1458        protected void adjustSlopeVelocities(int metadata)
1459        {
1460            double acceleration = 0.0078125D;
1461            if (metadata == 2)
1462            {
1463                motionX -= acceleration;
1464            }
1465            else if (metadata == 3)
1466            {
1467                motionX += acceleration;
1468            }
1469            else if (metadata == 4)
1470            {
1471                motionZ += acceleration;
1472            }
1473            else if (metadata == 5)
1474            {
1475                motionZ -= acceleration;
1476            }
1477        }
1478    
1479        /**
1480         * Getters/setters for physics variables
1481         */
1482    
1483        /**
1484         * Returns the carts max speed.
1485         * Carts going faster than 1.1 cause issues with chunk loading.
1486         * Carts cant traverse slopes or corners at greater than 0.5 - 0.6.
1487         * This value is compared with the rails max speed to determine
1488         * the carts current max speed. A normal rails max speed is 0.4.
1489         * @return Carts max speed.
1490         */
1491        public float getMaxSpeedRail()
1492        {
1493            return maxSpeedRail;
1494        }
1495    
1496        public void setMaxSpeedRail(float value)
1497        {
1498            maxSpeedRail = value;
1499        }
1500    
1501        public float getMaxSpeedGround()
1502        {
1503            return maxSpeedGround;
1504        }
1505    
1506        public void setMaxSpeedGround(float value)
1507        {
1508            maxSpeedGround = value;
1509        }
1510    
1511        public float getMaxSpeedAirLateral()
1512        {
1513            return maxSpeedAirLateral;
1514        }
1515    
1516        public void setMaxSpeedAirLateral(float value)
1517        {
1518            maxSpeedAirLateral = value;
1519        }
1520    
1521        public float getMaxSpeedAirVertical()
1522        {
1523            return maxSpeedAirVertical;
1524        }
1525    
1526        public void setMaxSpeedAirVertical(float value)
1527        {
1528            maxSpeedAirVertical = value;
1529        }
1530    
1531        public double getDragAir()
1532        {
1533            return dragAir;
1534        }
1535    
1536        public void setDragAir(double value)
1537        {
1538            dragAir = value;
1539        }
1540    }