001    package net.minecraft.entity.item;
002    
003    import cpw.mods.fml.relauncher.Side;
004    import cpw.mods.fml.relauncher.SideOnly;
005    
006    import java.util.ArrayList;
007    import java.util.List;
008    import net.minecraft.block.Block;
009    import net.minecraft.block.BlockRail;
010    import net.minecraft.entity.Entity;
011    import net.minecraft.entity.EntityLiving;
012    import net.minecraft.entity.monster.EntityIronGolem;
013    import net.minecraft.entity.player.EntityPlayer;
014    import net.minecraft.inventory.IInventory;
015    import net.minecraft.item.Item;
016    import net.minecraft.item.ItemStack;
017    import net.minecraft.nbt.NBTTagCompound;
018    import net.minecraft.nbt.NBTTagList;
019    import net.minecraft.server.MinecraftServer;
020    import net.minecraft.server.gui.IUpdatePlayerListBox;
021    import net.minecraft.util.AxisAlignedBB;
022    import net.minecraft.util.DamageSource;
023    import net.minecraft.util.MathHelper;
024    import net.minecraft.util.Vec3;
025    import net.minecraft.world.World;
026    import net.minecraft.world.WorldServer;
027    
028    import net.minecraftforge.common.IMinecartCollisionHandler;
029    import net.minecraftforge.common.MinecartRegistry;
030    import net.minecraftforge.common.MinecraftForge;
031    import net.minecraftforge.event.entity.minecart.*;
032    
033    public class EntityMinecart extends Entity implements IInventory
034    {
035        /** Array of item stacks stored in minecart (for storage minecarts). */
036        protected ItemStack[] cargoItems;
037        protected int fuel;
038        protected boolean field_70499_f;
039    
040        /** The type of minecart, 2 for powered, 1 for storage. */
041        public int minecartType;
042        public double pushX;
043        public double pushZ;
044        protected final IUpdatePlayerListBox field_82344_g;
045        protected boolean field_82345_h;
046        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}}};
047    
048        /** appears to be the progress of the turn */
049        protected int turnProgress;
050        protected double minecartX;
051        protected double minecartY;
052        protected double minecartZ;
053        protected double minecartYaw;
054        protected double minecartPitch;
055        @SideOnly(Side.CLIENT)
056        protected double velocityX;
057        @SideOnly(Side.CLIENT)
058        protected double velocityY;
059        @SideOnly(Side.CLIENT)
060        protected double velocityZ;
061    
062        /* Forge: Minecart Compatibility Layer Integration. */
063        public static float defaultMaxSpeedRail = 0.4f;
064        public static float defaultMaxSpeedGround = 0.4f;
065        public static float defaultMaxSpeedAirLateral = 0.4f;
066        public static float defaultMaxSpeedAirVertical = -1f;
067        public static double defaultDragRidden = 0.996999979019165D;
068        public static double defaultDragEmpty = 0.9599999785423279D;
069        public static double defaultDragAir = 0.94999998807907104D;
070        protected boolean canUseRail = true;
071        protected boolean canBePushed = true;
072        private static IMinecartCollisionHandler collisionHandler = null;
073    
074        /* Instance versions of the above physics properties */
075        protected float maxSpeedRail;
076        protected float maxSpeedGround;
077        protected float maxSpeedAirLateral;
078        protected float maxSpeedAirVertical;
079        protected double dragAir;
080    
081        public EntityMinecart(World par1World)
082        {
083            super(par1World);
084            this.cargoItems = new ItemStack[36];
085            this.fuel = 0;
086            this.field_70499_f = false;
087            this.field_82345_h = true;
088            this.preventEntitySpawning = true;
089            this.setSize(0.98F, 0.7F);
090            this.yOffset = this.height / 2.0F;
091            this.field_82344_g = par1World != null ? par1World.func_82735_a(this) : null;
092    
093            maxSpeedRail = defaultMaxSpeedRail;
094            maxSpeedGround = defaultMaxSpeedGround;
095            maxSpeedAirLateral = defaultMaxSpeedAirLateral;
096            maxSpeedAirVertical = defaultMaxSpeedAirVertical;
097            dragAir = defaultDragAir;
098        }
099    
100        public EntityMinecart(World world, int type)
101        {
102            this(world);
103            minecartType = type;
104        }
105    
106        /**
107         * returns if this entity triggers Block.onEntityWalking on the blocks they walk on. used for spiders and wolves to
108         * prevent them from trampling crops
109         */
110        protected boolean canTriggerWalking()
111        {
112            return false;
113        }
114    
115        protected void entityInit()
116        {
117            this.dataWatcher.addObject(16, new Byte((byte)0));
118            this.dataWatcher.addObject(17, new Integer(0));
119            this.dataWatcher.addObject(18, new Integer(1));
120            this.dataWatcher.addObject(19, new Integer(0));
121        }
122    
123        /**
124         * Returns a boundingBox used to collide the entity with other entities and blocks. This enables the entity to be
125         * pushable on contact, like boats or minecarts.
126         */
127        public AxisAlignedBB getCollisionBox(Entity par1Entity)
128        {
129            if (getCollisionHandler() != null)
130            {
131                return getCollisionHandler().getCollisionBox(this, par1Entity);
132            }
133            return par1Entity.canBePushed() ? par1Entity.boundingBox : null;
134        }
135    
136        /**
137         * returns the bounding box for this entity
138         */
139        public AxisAlignedBB getBoundingBox()
140        {
141            if (getCollisionHandler() != null)
142            {
143                return getCollisionHandler().getBoundingBox(this);
144            }
145            return null;
146        }
147    
148        /**
149         * Returns true if this entity should push and be pushed by other entities when colliding.
150         */
151        public boolean canBePushed()
152        {
153            return canBePushed;
154        }
155    
156        public EntityMinecart(World par1World, double par2, double par4, double par6, int par8)
157        {
158            this(par1World);
159            this.setPosition(par2, par4 + (double)this.yOffset, par6);
160            this.motionX = 0.0D;
161            this.motionY = 0.0D;
162            this.motionZ = 0.0D;
163            this.prevPosX = par2;
164            this.prevPosY = par4;
165            this.prevPosZ = par6;
166            this.minecartType = par8;
167        }
168    
169        /**
170         * Returns the Y offset from the entity's position for any entity riding this one.
171         */
172        public double getMountedYOffset()
173        {
174            return (double)this.height * 0.0D - 0.30000001192092896D;
175        }
176    
177        /**
178         * Called when the entity is attacked.
179         */
180        public boolean attackEntityFrom(DamageSource par1DamageSource, int par2)
181        {
182            if (!this.worldObj.isRemote && !this.isDead)
183            {
184                if (this.func_85032_ar())
185                {
186                    return false;
187                }
188                else
189                {
190                    this.func_70494_i(-this.func_70493_k());
191                    this.func_70497_h(10);
192                    this.setBeenAttacked();
193                    this.setDamage(this.getDamage() + par2 * 10);
194    
195                    if (par1DamageSource.getEntity() instanceof EntityPlayer && ((EntityPlayer)par1DamageSource.getEntity()).capabilities.isCreativeMode)
196                    {
197                        this.setDamage(100);
198                    }
199    
200                    if (this.getDamage() > 40)
201                    {
202                        if (this.riddenByEntity != null)
203                        {
204                            this.riddenByEntity.mountEntity(this);
205                        }
206    
207                        this.setDead();
208                        dropCartAsItem();
209                    }
210    
211                    return true;
212                }
213            }
214            else
215            {
216                return true;
217            }
218        }
219    
220        @SideOnly(Side.CLIENT)
221    
222        /**
223         * Setups the entity to do the hurt animation. Only used by packets in multiplayer.
224         */
225        public void performHurtAnimation()
226        {
227            this.func_70494_i(-this.func_70493_k());
228            this.func_70497_h(10);
229            this.setDamage(this.getDamage() + this.getDamage() * 10);
230        }
231    
232        /**
233         * Returns true if other Entities should be prevented from moving through this Entity.
234         */
235        public boolean canBeCollidedWith()
236        {
237            return !this.isDead;
238        }
239    
240        /**
241         * Will get destroyed next tick.
242         */
243        public void setDead()
244        {
245            if (this.field_82345_h)
246            {
247                for (int var1 = 0; var1 < this.getSizeInventory(); ++var1)
248                {
249                    ItemStack var2 = this.getStackInSlot(var1);
250    
251                    if (var2 != null)
252                    {
253                        float var3 = this.rand.nextFloat() * 0.8F + 0.1F;
254                        float var4 = this.rand.nextFloat() * 0.8F + 0.1F;
255                        float var5 = this.rand.nextFloat() * 0.8F + 0.1F;
256    
257                        while (var2.stackSize > 0)
258                        {
259                            int var6 = this.rand.nextInt(21) + 10;
260    
261                            if (var6 > var2.stackSize)
262                            {
263                                var6 = var2.stackSize;
264                            }
265    
266                            var2.stackSize -= var6;
267                            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()));
268    
269                            if (var2.hasTagCompound())
270                            {
271                                var7.func_92014_d().setTagCompound((NBTTagCompound)var2.getTagCompound().copy());
272                            }
273    
274                            float var8 = 0.05F;
275                            var7.motionX = (double)((float)this.rand.nextGaussian() * var8);
276                            var7.motionY = (double)((float)this.rand.nextGaussian() * var8 + 0.2F);
277                            var7.motionZ = (double)((float)this.rand.nextGaussian() * var8);
278                            this.worldObj.spawnEntityInWorld(var7);
279                        }
280                    }
281                }
282            }
283    
284            super.setDead();
285    
286            if (this.field_82344_g != null)
287            {
288                this.field_82344_g.update();
289            }
290        }
291    
292        /**
293         * Teleports the entity to another dimension. Params: Dimension number to teleport to
294         */
295        public void travelToDimension(int par1)
296        {
297            this.field_82345_h = false;
298            super.travelToDimension(par1);
299        }
300    
301        /**
302         * Called to update the entity's position/logic.
303         */
304        public void onUpdate()
305        {
306            if (this.field_82344_g != null)
307            {
308                this.field_82344_g.update();
309            }
310    
311            if (this.func_70496_j() > 0)
312            {
313                this.func_70497_h(this.func_70496_j() - 1);
314            }
315    
316            if (this.getDamage() > 0)
317            {
318                this.setDamage(this.getDamage() - 1);
319            }
320    
321            if (this.posY < -64.0D)
322            {
323                this.kill();
324            }
325    
326            if (this.isMinecartPowered() && this.rand.nextInt(4) == 0 && minecartType == 2 && getClass() == EntityMinecart.class)
327            {
328                this.worldObj.spawnParticle("largesmoke", this.posX, this.posY + 0.8D, this.posZ, 0.0D, 0.0D, 0.0D);
329            }
330    
331            int var2;
332    
333            if (!this.worldObj.isRemote && this.worldObj instanceof WorldServer)
334            {
335                this.worldObj.theProfiler.startSection("portal");
336                MinecraftServer var1 = ((WorldServer)this.worldObj).getMinecraftServer();
337                var2 = this.getMaxInPortalTime();
338    
339                if (this.inPortal)
340                {
341                    if (var1.getAllowNether())
342                    {
343                        if (this.ridingEntity == null && this.field_82153_h++ >= var2)
344                        {
345                            this.field_82153_h = var2;
346                            this.timeUntilPortal = this.getPortalCooldown();
347                            byte var3;
348    
349                            if (this.worldObj.provider.dimensionId == -1)
350                            {
351                                var3 = 0;
352                            }
353                            else
354                            {
355                                var3 = -1;
356                            }
357    
358                            this.travelToDimension(var3);
359                        }
360    
361                        this.inPortal = false;
362                    }
363                }
364                else
365                {
366                    if (this.field_82153_h > 0)
367                    {
368                        this.field_82153_h -= 4;
369                    }
370    
371                    if (this.field_82153_h < 0)
372                    {
373                        this.field_82153_h = 0;
374                    }
375                }
376    
377                if (this.timeUntilPortal > 0)
378                {
379                    --this.timeUntilPortal;
380                }
381    
382                this.worldObj.theProfiler.endSection();
383            }
384    
385            if (this.worldObj.isRemote)
386            {
387                if (this.turnProgress > 0)
388                {
389                    double var46 = this.posX + (this.minecartX - this.posX) / (double)this.turnProgress;
390                    double var48 = this.posY + (this.minecartY - this.posY) / (double)this.turnProgress;
391                    double var5 = this.posZ + (this.minecartZ - this.posZ) / (double)this.turnProgress;
392                    double var7 = MathHelper.wrapAngleTo180_double(this.minecartYaw - (double)this.rotationYaw);
393                    this.rotationYaw = (float)((double)this.rotationYaw + var7 / (double)this.turnProgress);
394                    this.rotationPitch = (float)((double)this.rotationPitch + (this.minecartPitch - (double)this.rotationPitch) / (double)this.turnProgress);
395                    --this.turnProgress;
396                    this.setPosition(var46, var48, var5);
397                    this.setRotation(this.rotationYaw, this.rotationPitch);
398                }
399                else
400                {
401                    this.setPosition(this.posX, this.posY, this.posZ);
402                    this.setRotation(this.rotationYaw, this.rotationPitch);
403                }
404            }
405            else
406            {
407                this.prevPosX = this.posX;
408                this.prevPosY = this.posY;
409                this.prevPosZ = this.posZ;
410                this.motionY -= 0.03999999910593033D;
411                int var45 = MathHelper.floor_double(this.posX);
412                var2 = MathHelper.floor_double(this.posY);
413                int var47 = MathHelper.floor_double(this.posZ);
414    
415                if (BlockRail.isRailBlockAt(this.worldObj, var45, var2 - 1, var47))
416                {
417                    --var2;
418                }
419    
420                double var4 = 0.4D;
421                double var6 = 0.0078125D;
422                int var8 = this.worldObj.getBlockId(var45, var2, var47);
423    
424                if (canUseRail() && BlockRail.isRailBlock(var8))
425                {
426                    this.fallDistance = 0.0F;
427                    Vec3 var9 = this.func_70489_a(this.posX, this.posY, this.posZ);
428                    int var10 = ((BlockRail)Block.blocksList[var8]).getBasicRailMetadata(worldObj, this, var45, var2, var47);
429                    this.posY = (double)var2;
430                    boolean var11 = false;
431                    boolean var12 = false;
432    
433                    if (var8 == Block.railPowered.blockID)
434                    {
435                        var11 = (worldObj.getBlockMetadata(var45, var2, var47) & 8) != 0;
436                        var12 = !var11;
437                    }
438    
439                    if (((BlockRail)Block.blocksList[var8]).isPowered())
440                    {
441                        var10 &= 7;
442                    }
443    
444                    if (var10 >= 2 && var10 <= 5)
445                    {
446                        this.posY = (double)(var2 + 1);
447                    }
448    
449                    adjustSlopeVelocities(var10);
450    
451                    int[][] var13 = field_70500_g[var10];
452                    double var14 = (double)(var13[1][0] - var13[0][0]);
453                    double var16 = (double)(var13[1][2] - var13[0][2]);
454                    double var18 = Math.sqrt(var14 * var14 + var16 * var16);
455                    double var20 = this.motionX * var14 + this.motionZ * var16;
456    
457                    if (var20 < 0.0D)
458                    {
459                        var14 = -var14;
460                        var16 = -var16;
461                    }
462    
463                    double var22 = Math.sqrt(this.motionX * this.motionX + this.motionZ * this.motionZ);
464                    this.motionX = var22 * var14 / var18;
465                    this.motionZ = var22 * var16 / var18;
466                    double var24;
467                    double var26;
468    
469                    if (this.riddenByEntity != null)
470                    {
471                        var24 = this.riddenByEntity.motionX * this.riddenByEntity.motionX + this.riddenByEntity.motionZ * this.riddenByEntity.motionZ;
472                        var26 = this.motionX * this.motionX + this.motionZ * this.motionZ;
473    
474                        if (var24 > 1.0E-4D && var26 < 0.01D)
475                        {
476                            this.motionX += this.riddenByEntity.motionX * 0.1D;
477                            this.motionZ += this.riddenByEntity.motionZ * 0.1D;
478                            var12 = false;
479                        }
480                    }
481    
482                    if (var12 && shouldDoRailFunctions())
483                    {
484                        var24 = Math.sqrt(this.motionX * this.motionX + this.motionZ * this.motionZ);
485    
486                        if (var24 < 0.03D)
487                        {
488                            this.motionX *= 0.0D;
489                            this.motionY *= 0.0D;
490                            this.motionZ *= 0.0D;
491                        }
492                        else
493                        {
494                            this.motionX *= 0.5D;
495                            this.motionY *= 0.0D;
496                            this.motionZ *= 0.5D;
497                        }
498                    }
499    
500                    var24 = 0.0D;
501                    var26 = (double)var45 + 0.5D + (double)var13[0][0] * 0.5D;
502                    double var28 = (double)var47 + 0.5D + (double)var13[0][2] * 0.5D;
503                    double var30 = (double)var45 + 0.5D + (double)var13[1][0] * 0.5D;
504                    double var32 = (double)var47 + 0.5D + (double)var13[1][2] * 0.5D;
505                    var14 = var30 - var26;
506                    var16 = var32 - var28;
507                    double var34;
508                    double var36;
509    
510                    if (var14 == 0.0D)
511                    {
512                        this.posX = (double)var45 + 0.5D;
513                        var24 = this.posZ - (double)var47;
514                    }
515                    else if (var16 == 0.0D)
516                    {
517                        this.posZ = (double)var47 + 0.5D;
518                        var24 = this.posX - (double)var45;
519                    }
520                    else
521                    {
522                        var34 = this.posX - var26;
523                        var36 = this.posZ - var28;
524                        var24 = (var34 * var14 + var36 * var16) * 2.0D;
525                    }
526    
527                    this.posX = var26 + var14 * var24;
528                    this.posZ = var28 + var16 * var24;
529                    this.setPosition(this.posX, this.posY + (double)this.yOffset, this.posZ);
530    
531                    moveMinecartOnRail(var45, var2, var47);
532    
533                    if (var13[0][1] != 0 && MathHelper.floor_double(this.posX) - var45 == var13[0][0] && MathHelper.floor_double(this.posZ) - var47 == var13[0][2])
534                    {
535                        this.setPosition(this.posX, this.posY + (double)var13[0][1], this.posZ);
536                    }
537                    else if (var13[1][1] != 0 && MathHelper.floor_double(this.posX) - var45 == var13[1][0] && MathHelper.floor_double(this.posZ) - var47 == var13[1][2])
538                    {
539                        this.setPosition(this.posX, this.posY + (double)var13[1][1], this.posZ);
540                    }
541    
542                    applyDragAndPushForces();
543    
544                    Vec3 var54 = this.func_70489_a(this.posX, this.posY, this.posZ);
545    
546                    if (var54 != null && var9 != null)
547                    {
548                        double var39 = (var9.yCoord - var54.yCoord) * 0.05D;
549                        var22 = Math.sqrt(this.motionX * this.motionX + this.motionZ * this.motionZ);
550    
551                        if (var22 > 0.0D)
552                        {
553                            this.motionX = this.motionX / var22 * (var22 + var39);
554                            this.motionZ = this.motionZ / var22 * (var22 + var39);
555                        }
556    
557                        this.setPosition(this.posX, var54.yCoord, this.posZ);
558                    }
559    
560                    int var53 = MathHelper.floor_double(this.posX);
561                    int var55 = MathHelper.floor_double(this.posZ);
562    
563                    if (var53 != var45 || var55 != var47)
564                    {
565                        var22 = Math.sqrt(this.motionX * this.motionX + this.motionZ * this.motionZ);
566                        this.motionX = var22 * (double)(var53 - var45);
567                        this.motionZ = var22 * (double)(var55 - var47);
568                    }
569    
570                    double var41;
571    
572                    updatePushForces();
573    
574                    if(shouldDoRailFunctions())
575                    {
576                        ((BlockRail)Block.blocksList[var8]).onMinecartPass(worldObj, this, var45, var2, var47);
577                    }
578    
579                    if (var11 && shouldDoRailFunctions())
580                    {
581                        var41 = Math.sqrt(this.motionX * this.motionX + this.motionZ * this.motionZ);
582    
583                        if (var41 > 0.01D)
584                        {
585                            double var43 = 0.06D;
586                            this.motionX += this.motionX / var41 * var43;
587                            this.motionZ += this.motionZ / var41 * var43;
588                        }
589                        else if (var10 == 1)
590                        {
591                            if (this.worldObj.isBlockNormalCube(var45 - 1, var2, var47))
592                            {
593                                this.motionX = 0.02D;
594                            }
595                            else if (this.worldObj.isBlockNormalCube(var45 + 1, var2, var47))
596                            {
597                                this.motionX = -0.02D;
598                            }
599                        }
600                        else if (var10 == 0)
601                        {
602                            if (this.worldObj.isBlockNormalCube(var45, var2, var47 - 1))
603                            {
604                                this.motionZ = 0.02D;
605                            }
606                            else if (this.worldObj.isBlockNormalCube(var45, var2, var47 + 1))
607                            {
608                                this.motionZ = -0.02D;
609                            }
610                        }
611                    }
612                }
613                else
614                {
615                    moveMinecartOffRail(var45, var2, var47);
616                }
617    
618                this.doBlockCollisions();
619                this.rotationPitch = 0.0F;
620                double var49 = this.prevPosX - this.posX;
621                double var50 = this.prevPosZ - this.posZ;
622    
623                if (var49 * var49 + var50 * var50 > 0.001D)
624                {
625                    this.rotationYaw = (float)(Math.atan2(var50, var49) * 180.0D / Math.PI);
626    
627                    if (this.field_70499_f)
628                    {
629                        this.rotationYaw += 180.0F;
630                    }
631                }
632    
633                double var51 = (double)MathHelper.wrapAngleTo180_float(this.rotationYaw - this.prevRotationYaw);
634    
635                if (var51 < -170.0D || var51 >= 170.0D)
636                {
637                    this.rotationYaw += 180.0F;
638                    this.field_70499_f = !this.field_70499_f;
639                }
640    
641                this.setRotation(this.rotationYaw, this.rotationPitch);
642    
643                AxisAlignedBB box = null;
644                if (getCollisionHandler() != null)
645                {
646                    box = getCollisionHandler().getMinecartCollisionBox(this);
647                }
648                else
649                {
650                    box = boundingBox.expand(0.2D, 0.0D, 0.2D);
651                }
652    
653                List var15 = this.worldObj.getEntitiesWithinAABBExcludingEntity(this, box);
654    
655                if (var15 != null && !var15.isEmpty())
656                {
657                    for (int var52 = 0; var52 < var15.size(); ++var52)
658                    {
659                        Entity var17 = (Entity)var15.get(var52);
660    
661                        if (var17 != this.riddenByEntity && var17.canBePushed() && var17 instanceof EntityMinecart)
662                        {
663                            var17.applyEntityCollision(this);
664                        }
665                    }
666                }
667    
668                if (this.riddenByEntity != null && this.riddenByEntity.isDead)
669                {
670                    if (this.riddenByEntity.ridingEntity == this)
671                    {
672                        this.riddenByEntity.ridingEntity = null;
673                    }
674    
675                    this.riddenByEntity = null;
676                }
677    
678                updateFuel();
679                MinecraftForge.EVENT_BUS.post(new MinecartUpdateEvent(this, var45, var2, var47));
680            }
681        }
682    
683        @SideOnly(Side.CLIENT)
684        public Vec3 func_70495_a(double par1, double par3, double par5, double par7)
685        {
686            int var9 = MathHelper.floor_double(par1);
687            int var10 = MathHelper.floor_double(par3);
688            int var11 = MathHelper.floor_double(par5);
689    
690            if (BlockRail.isRailBlockAt(this.worldObj, var9, var10 - 1, var11))
691            {
692                --var10;
693            }
694    
695            int var12 = this.worldObj.getBlockId(var9, var10, var11);
696    
697            if (!BlockRail.isRailBlock(var12))
698            {
699                return null;
700            }
701            else
702            {
703                int var13 = ((BlockRail)Block.blocksList[var12]).getBasicRailMetadata(worldObj, this, var9, var10, var11);
704    
705                par3 = (double)var10;
706    
707                if (var13 >= 2 && var13 <= 5)
708                {
709                    par3 = (double)(var10 + 1);
710                }
711    
712                int[][] var14 = field_70500_g[var13];
713                double var15 = (double)(var14[1][0] - var14[0][0]);
714                double var17 = (double)(var14[1][2] - var14[0][2]);
715                double var19 = Math.sqrt(var15 * var15 + var17 * var17);
716                var15 /= var19;
717                var17 /= var19;
718                par1 += var15 * par7;
719                par5 += var17 * par7;
720    
721                if (var14[0][1] != 0 && MathHelper.floor_double(par1) - var9 == var14[0][0] && MathHelper.floor_double(par5) - var11 == var14[0][2])
722                {
723                    par3 += (double)var14[0][1];
724                }
725                else if (var14[1][1] != 0 && MathHelper.floor_double(par1) - var9 == var14[1][0] && MathHelper.floor_double(par5) - var11 == var14[1][2])
726                {
727                    par3 += (double)var14[1][1];
728                }
729    
730                return this.func_70489_a(par1, par3, par5);
731            }
732        }
733    
734        public Vec3 func_70489_a(double par1, double par3, double par5)
735        {
736            int var7 = MathHelper.floor_double(par1);
737            int var8 = MathHelper.floor_double(par3);
738            int var9 = MathHelper.floor_double(par5);
739    
740            if (BlockRail.isRailBlockAt(this.worldObj, var7, var8 - 1, var9))
741            {
742                --var8;
743            }
744    
745            int var10 = this.worldObj.getBlockId(var7, var8, var9);
746    
747            if (BlockRail.isRailBlock(var10))
748            {
749                int var11 = ((BlockRail)Block.blocksList[var10]).getBasicRailMetadata(worldObj, this, var7, var8, var9);
750                par3 = (double)var8;
751    
752                if (var11 >= 2 && var11 <= 5)
753                {
754                    par3 = (double)(var8 + 1);
755                }
756    
757                int[][] var12 = field_70500_g[var11];
758                double var13 = 0.0D;
759                double var15 = (double)var7 + 0.5D + (double)var12[0][0] * 0.5D;
760                double var17 = (double)var8 + 0.5D + (double)var12[0][1] * 0.5D;
761                double var19 = (double)var9 + 0.5D + (double)var12[0][2] * 0.5D;
762                double var21 = (double)var7 + 0.5D + (double)var12[1][0] * 0.5D;
763                double var23 = (double)var8 + 0.5D + (double)var12[1][1] * 0.5D;
764                double var25 = (double)var9 + 0.5D + (double)var12[1][2] * 0.5D;
765                double var27 = var21 - var15;
766                double var29 = (var23 - var17) * 2.0D;
767                double var31 = var25 - var19;
768    
769                if (var27 == 0.0D)
770                {
771                    par1 = (double)var7 + 0.5D;
772                    var13 = par5 - (double)var9;
773                }
774                else if (var31 == 0.0D)
775                {
776                    par5 = (double)var9 + 0.5D;
777                    var13 = par1 - (double)var7;
778                }
779                else
780                {
781                    double var33 = par1 - var15;
782                    double var35 = par5 - var19;
783                    var13 = (var33 * var27 + var35 * var31) * 2.0D;
784                }
785    
786                par1 = var15 + var27 * var13;
787                par3 = var17 + var29 * var13;
788                par5 = var19 + var31 * var13;
789    
790                if (var29 < 0.0D)
791                {
792                    ++par3;
793                }
794    
795                if (var29 > 0.0D)
796                {
797                    par3 += 0.5D;
798                }
799    
800                return this.worldObj.getWorldVec3Pool().getVecFromPool(par1, par3, par5);
801            }
802            else
803            {
804                return null;
805            }
806        }
807    
808        /**
809         * (abstract) Protected helper method to write subclass entity data to NBT.
810         */
811        protected void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
812        {
813            par1NBTTagCompound.setInteger("Type", this.minecartType);
814    
815            if (isPoweredCart())
816            {
817                par1NBTTagCompound.setDouble("PushX", this.pushX);
818                par1NBTTagCompound.setDouble("PushZ", this.pushZ);
819                par1NBTTagCompound.setInteger("Fuel", this.fuel);
820            }
821    
822            if (getSizeInventory() > 0)
823            {
824                NBTTagList var2 = new NBTTagList();
825    
826                for (int var3 = 0; var3 < this.cargoItems.length; ++var3)
827                {
828                    if (this.cargoItems[var3] != null)
829                    {
830                        NBTTagCompound var4 = new NBTTagCompound();
831                        var4.setByte("Slot", (byte)var3);
832                        this.cargoItems[var3].writeToNBT(var4);
833                        var2.appendTag(var4);
834                    }
835                }
836    
837                par1NBTTagCompound.setTag("Items", var2);
838            }
839        }
840    
841        /**
842         * (abstract) Protected helper method to read subclass entity data from NBT.
843         */
844        protected void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
845        {
846            this.minecartType = par1NBTTagCompound.getInteger("Type");
847    
848            if (isPoweredCart())
849            {
850                this.pushX = par1NBTTagCompound.getDouble("PushX");
851                this.pushZ = par1NBTTagCompound.getDouble("PushZ");
852                try
853                {
854                    this.fuel = par1NBTTagCompound.getInteger("Fuel");
855                }
856                catch (ClassCastException e)
857                {
858                    this.fuel = par1NBTTagCompound.getShort("Fuel");
859                }
860            }
861    
862            if (getSizeInventory() > 0)
863            {
864                NBTTagList var2 = par1NBTTagCompound.getTagList("Items");
865                this.cargoItems = new ItemStack[this.getSizeInventory()];
866    
867                for (int var3 = 0; var3 < var2.tagCount(); ++var3)
868                {
869                    NBTTagCompound var4 = (NBTTagCompound)var2.tagAt(var3);
870                    int var5 = var4.getByte("Slot") & 255;
871    
872                    if (var5 >= 0 && var5 < this.cargoItems.length)
873                    {
874                        this.cargoItems[var5] = ItemStack.loadItemStackFromNBT(var4);
875                    }
876                }
877            }
878        }
879    
880        @SideOnly(Side.CLIENT)
881        public float getShadowSize()
882        {
883            return 0.0F;
884        }
885    
886        /**
887         * Applies a velocity to each of the entities pushing them away from each other. Args: entity
888         */
889        public void applyEntityCollision(Entity par1Entity)
890        {
891            MinecraftForge.EVENT_BUS.post(new MinecartCollisionEvent(this, par1Entity));
892            if (getCollisionHandler() != null)
893            {
894                getCollisionHandler().onEntityCollision(this, par1Entity);
895                return;
896            }
897            if (!this.worldObj.isRemote)
898            {
899                if (par1Entity != this.riddenByEntity)
900                {
901                    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)
902                    {
903                        par1Entity.mountEntity(this);
904                    }
905    
906                    double var2 = par1Entity.posX - this.posX;
907                    double var4 = par1Entity.posZ - this.posZ;
908                    double var6 = var2 * var2 + var4 * var4;
909    
910                    if (var6 >= 9.999999747378752E-5D)
911                    {
912                        var6 = (double)MathHelper.sqrt_double(var6);
913                        var2 /= var6;
914                        var4 /= var6;
915                        double var8 = 1.0D / var6;
916    
917                        if (var8 > 1.0D)
918                        {
919                            var8 = 1.0D;
920                        }
921    
922                        var2 *= var8;
923                        var4 *= var8;
924                        var2 *= 0.10000000149011612D;
925                        var4 *= 0.10000000149011612D;
926                        var2 *= (double)(1.0F - this.entityCollisionReduction);
927                        var4 *= (double)(1.0F - this.entityCollisionReduction);
928                        var2 *= 0.5D;
929                        var4 *= 0.5D;
930    
931                        if (par1Entity instanceof EntityMinecart)
932                        {
933                            double var10 = par1Entity.posX - this.posX;
934                            double var12 = par1Entity.posZ - this.posZ;
935                            Vec3 var14 = this.worldObj.getWorldVec3Pool().getVecFromPool(var10, 0.0D, var12).normalize();
936                            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();
937                            double var16 = Math.abs(var14.dotProduct(var15));
938    
939                            if (var16 < 0.800000011920929D)
940                            {
941                                return;
942                            }
943    
944                            double var18 = par1Entity.motionX + this.motionX;
945                            double var20 = par1Entity.motionZ + this.motionZ;
946    
947                            if (((EntityMinecart)par1Entity).isPoweredCart() && !isPoweredCart())
948                            {
949                                this.motionX *= 0.20000000298023224D;
950                                this.motionZ *= 0.20000000298023224D;
951                                this.addVelocity(par1Entity.motionX - var2, 0.0D, par1Entity.motionZ - var4);
952                                par1Entity.motionX *= 0.949999988079071D;
953                                par1Entity.motionZ *= 0.949999988079071D;
954                            }
955                            else if (!((EntityMinecart)par1Entity).isPoweredCart() && isPoweredCart())
956                            {
957                                par1Entity.motionX *= 0.20000000298023224D;
958                                par1Entity.motionZ *= 0.20000000298023224D;
959                                par1Entity.addVelocity(this.motionX + var2, 0.0D, this.motionZ + var4);
960                                this.motionX *= 0.949999988079071D;
961                                this.motionZ *= 0.949999988079071D;
962                            }
963                            else
964                            {
965                                var18 /= 2.0D;
966                                var20 /= 2.0D;
967                                this.motionX *= 0.20000000298023224D;
968                                this.motionZ *= 0.20000000298023224D;
969                                this.addVelocity(var18 - var2, 0.0D, var20 - var4);
970                                par1Entity.motionX *= 0.20000000298023224D;
971                                par1Entity.motionZ *= 0.20000000298023224D;
972                                par1Entity.addVelocity(var18 + var2, 0.0D, var20 + var4);
973                            }
974                        }
975                        else
976                        {
977                            this.addVelocity(-var2, 0.0D, -var4);
978                            par1Entity.addVelocity(var2 / 4.0D, 0.0D, var4 / 4.0D);
979                        }
980                    }
981                }
982            }
983        }
984    
985        /**
986         * Returns the number of slots in the inventory.
987         */
988        public int getSizeInventory()
989        {
990            return (minecartType == 1 && getClass() == EntityMinecart.class ? 27 : 0);
991        }
992    
993        /**
994         * Returns the stack in slot i
995         */
996        public ItemStack getStackInSlot(int par1)
997        {
998            return this.cargoItems[par1];
999        }
1000    
1001        /**
1002         * Removes from an inventory slot (first arg) up to a specified number (second arg) of items and returns them in a
1003         * new stack.
1004         */
1005        public ItemStack decrStackSize(int par1, int par2)
1006        {
1007            if (this.cargoItems[par1] != null)
1008            {
1009                ItemStack var3;
1010    
1011                if (this.cargoItems[par1].stackSize <= par2)
1012                {
1013                    var3 = this.cargoItems[par1];
1014                    this.cargoItems[par1] = null;
1015                    return var3;
1016                }
1017                else
1018                {
1019                    var3 = this.cargoItems[par1].splitStack(par2);
1020    
1021                    if (this.cargoItems[par1].stackSize == 0)
1022                    {
1023                        this.cargoItems[par1] = null;
1024                    }
1025    
1026                    return var3;
1027                }
1028            }
1029            else
1030            {
1031                return null;
1032            }
1033        }
1034    
1035        /**
1036         * When some containers are closed they call this on each slot, then drop whatever it returns as an EntityItem -
1037         * like when you close a workbench GUI.
1038         */
1039        public ItemStack getStackInSlotOnClosing(int par1)
1040        {
1041            if (this.cargoItems[par1] != null)
1042            {
1043                ItemStack var2 = this.cargoItems[par1];
1044                this.cargoItems[par1] = null;
1045                return var2;
1046            }
1047            else
1048            {
1049                return null;
1050            }
1051        }
1052    
1053        /**
1054         * Sets the given item stack to the specified slot in the inventory (can be crafting or armor sections).
1055         */
1056        public void setInventorySlotContents(int par1, ItemStack par2ItemStack)
1057        {
1058            this.cargoItems[par1] = par2ItemStack;
1059    
1060            if (par2ItemStack != null && par2ItemStack.stackSize > this.getInventoryStackLimit())
1061            {
1062                par2ItemStack.stackSize = this.getInventoryStackLimit();
1063            }
1064        }
1065    
1066        /**
1067         * Returns the name of the inventory.
1068         */
1069        public String getInvName()
1070        {
1071            return "container.minecart";
1072        }
1073    
1074        /**
1075         * Returns the maximum stack size for a inventory slot. Seems to always be 64, possibly will be extended. *Isn't
1076         * this more of a set than a get?*
1077         */
1078        public int getInventoryStackLimit()
1079        {
1080            return 64;
1081        }
1082    
1083        /**
1084         * Called when an the contents of an Inventory change, usually
1085         */
1086        public void onInventoryChanged() {}
1087    
1088        /**
1089         * Called when a player interacts with a mob. e.g. gets milk from a cow, gets into the saddle on a pig.
1090         */
1091        public boolean interact(EntityPlayer par1EntityPlayer)
1092        {
1093            if (MinecraftForge.EVENT_BUS.post(new MinecartInteractEvent(this, par1EntityPlayer)))
1094            {
1095                return true;
1096            }
1097    
1098            if (canBeRidden())
1099            {
1100                if (this.riddenByEntity != null && this.riddenByEntity instanceof EntityPlayer && this.riddenByEntity != par1EntityPlayer)
1101                {
1102                    return true;
1103                }
1104    
1105                if (!this.worldObj.isRemote)
1106                {
1107                    par1EntityPlayer.mountEntity(this);
1108                }
1109            }
1110            else if (getSizeInventory() > 0)
1111            {
1112                if (!this.worldObj.isRemote)
1113                {
1114                    par1EntityPlayer.displayGUIChest(this);
1115                }
1116            }
1117            else if (this.minecartType == 2 && getClass() == EntityMinecart.class)
1118            {
1119                ItemStack var2 = par1EntityPlayer.inventory.getCurrentItem();
1120    
1121                if (var2 != null && var2.itemID == Item.coal.shiftedIndex)
1122                {
1123                    if (--var2.stackSize == 0)
1124                    {
1125                        par1EntityPlayer.inventory.setInventorySlotContents(par1EntityPlayer.inventory.currentItem, (ItemStack)null);
1126                    }
1127    
1128                    this.fuel += 3600;
1129                }
1130    
1131                this.pushX = this.posX - par1EntityPlayer.posX;
1132                this.pushZ = this.posZ - par1EntityPlayer.posZ;
1133            }
1134    
1135            return true;
1136        }
1137    
1138        @SideOnly(Side.CLIENT)
1139    
1140        /**
1141         * Sets the position and rotation. Only difference from the other one is no bounding on the rotation. Args: posX,
1142         * posY, posZ, yaw, pitch
1143         */
1144        public void setPositionAndRotation2(double par1, double par3, double par5, float par7, float par8, int par9)
1145        {
1146            this.minecartX = par1;
1147            this.minecartY = par3;
1148            this.minecartZ = par5;
1149            this.minecartYaw = (double)par7;
1150            this.minecartPitch = (double)par8;
1151            this.turnProgress = par9 + 2;
1152            this.motionX = this.velocityX;
1153            this.motionY = this.velocityY;
1154            this.motionZ = this.velocityZ;
1155        }
1156    
1157        @SideOnly(Side.CLIENT)
1158    
1159        /**
1160         * Sets the velocity to the args. Args: x, y, z
1161         */
1162        public void setVelocity(double par1, double par3, double par5)
1163        {
1164            this.velocityX = this.motionX = par1;
1165            this.velocityY = this.motionY = par3;
1166            this.velocityZ = this.motionZ = par5;
1167        }
1168    
1169        /**
1170         * Do not make give this method the name canInteractWith because it clashes with Container
1171         */
1172        public boolean isUseableByPlayer(EntityPlayer par1EntityPlayer)
1173        {
1174            return this.isDead ? false : par1EntityPlayer.getDistanceSqToEntity(this) <= 64.0D;
1175        }
1176    
1177        /**
1178         * Is this minecart powered (Fuel > 0)
1179         */
1180        public boolean isMinecartPowered()
1181        {
1182            return (this.dataWatcher.getWatchableObjectByte(16) & 1) != 0;
1183        }
1184    
1185        /**
1186         * Set if this minecart is powered (Fuel > 0)
1187         */
1188        protected void setMinecartPowered(boolean par1)
1189        {
1190            if (par1)
1191            {
1192                this.dataWatcher.updateObject(16, Byte.valueOf((byte)(this.dataWatcher.getWatchableObjectByte(16) | 1)));
1193            }
1194            else
1195            {
1196                this.dataWatcher.updateObject(16, Byte.valueOf((byte)(this.dataWatcher.getWatchableObjectByte(16) & -2)));
1197            }
1198        }
1199    
1200        public void openChest() {}
1201    
1202        public void closeChest() {}
1203    
1204        /**
1205         * Sets the current amount of damage the minecart has taken. Decreases over time. The cart breaks when this is over
1206         * 40.
1207         */
1208        public void setDamage(int par1)
1209        {
1210            this.dataWatcher.updateObject(19, Integer.valueOf(par1));
1211        }
1212    
1213        /**
1214         * Gets the current amount of damage the minecart has taken. Decreases over time. The cart breaks when this is over
1215         * 40.
1216         */
1217        public int getDamage()
1218        {
1219            return this.dataWatcher.getWatchableObjectInt(19);
1220        }
1221    
1222        public void func_70497_h(int par1)
1223        {
1224            this.dataWatcher.updateObject(17, Integer.valueOf(par1));
1225        }
1226    
1227        public int func_70496_j()
1228        {
1229            return this.dataWatcher.getWatchableObjectInt(17);
1230        }
1231    
1232        public void func_70494_i(int par1)
1233        {
1234            this.dataWatcher.updateObject(18, Integer.valueOf(par1));
1235        }
1236    
1237        public int func_70493_k()
1238        {
1239            return this.dataWatcher.getWatchableObjectInt(18);
1240        }
1241    
1242        /**
1243         * Drops the cart as a item. The exact item dropped is defined by getItemDropped().
1244         */
1245        public void dropCartAsItem()
1246        {
1247            for(ItemStack item : getItemsDropped())
1248            {
1249                entityDropItem(item, 0);
1250            }
1251        }
1252    
1253        /**
1254         * Override this to define which items your cart drops when broken.
1255         * This does not include items contained in the inventory,
1256         * that is handled elsewhere.
1257         * @return A list of items dropped.
1258         */
1259        public List<ItemStack> getItemsDropped()
1260        {
1261            List<ItemStack> items = new ArrayList<ItemStack>();
1262            items.add(new ItemStack(Item.minecartEmpty));
1263    
1264            switch(minecartType)
1265            {
1266                case 1:
1267                    items.add(new ItemStack(Block.chest));
1268                    break;
1269                case 2:
1270                    items.add(new ItemStack(Block.stoneOvenIdle));
1271                    break;
1272            }
1273            return items;
1274        }
1275    
1276        /**
1277         * This function returns an ItemStack that represents this cart.
1278         * This should be an ItemStack that can be used by the player to place the cart.
1279         * This is the item that was registered with the cart via the registerMinecart function,
1280         * but is not necessary the item the cart drops when destroyed.
1281         * @return An ItemStack that can be used to place the cart.
1282         */
1283        public ItemStack getCartItem()
1284        {
1285            return MinecartRegistry.getItemForCart(this);
1286        }
1287    
1288        /**
1289         * Returns true if this cart is self propelled.
1290         * @return True if powered.
1291         */
1292        public boolean isPoweredCart()
1293        {
1294            return minecartType == 2 && getClass() == EntityMinecart.class;
1295        }
1296    
1297        /**
1298         * Returns true if this cart is a storage cart
1299         * Some carts may have inventories but not be storage carts
1300         * and some carts without inventories may be storage carts.
1301         * @return True if this cart should be classified as a storage cart.
1302         */
1303        public boolean isStorageCart()
1304        {
1305            return minecartType == 1 && getClass() == EntityMinecart.class;
1306        }
1307    
1308        /**
1309         * Returns true if this cart can be ridden by an Entity.
1310         * @return True if this cart can be ridden.
1311         */
1312        public boolean canBeRidden()
1313        {
1314            if(minecartType == 0 && getClass() == EntityMinecart.class)
1315            {
1316                return true;
1317            }
1318            return false;
1319        }
1320    
1321        /**
1322         * Returns true if this cart can currently use rails.
1323         * This function is mainly used to gracefully detach a minecart from a rail.
1324         * @return True if the minecart can use rails.
1325         */
1326        public boolean canUseRail()
1327        {
1328            return canUseRail;
1329        }
1330    
1331        /**
1332         * Set whether the minecart can use rails.
1333         * This function is mainly used to gracefully detach a minecart from a rail.
1334         * @param use Whether the minecart can currently use rails.
1335         */
1336        public void setCanUseRail(boolean use)
1337        {
1338            canUseRail = use;
1339        }
1340    
1341        /**
1342         * Return false if this cart should not call IRail.onMinecartPass() and should ignore Powered Rails.
1343         * @return True if this cart should call IRail.onMinecartPass().
1344         */
1345        public boolean shouldDoRailFunctions()
1346        {
1347            return true;
1348        }
1349    
1350        /**
1351         * Simply returns the minecartType variable.
1352         * @return minecartType
1353         */
1354        public int getMinecartType()
1355        {
1356            return minecartType;
1357        }
1358    
1359        /**
1360         * Gets the current global Minecart Collision handler if none
1361         * is registered, returns null
1362         * @return The collision handler or null
1363         */
1364        public static IMinecartCollisionHandler getCollisionHandler()
1365        {
1366            return collisionHandler;
1367        }
1368    
1369        /**
1370         * Sets the global Minecart Collision handler, overwrites any
1371         * that is currently set.
1372         * @param handler The new handler
1373         */
1374        public static void setCollisionHandler(IMinecartCollisionHandler handler)
1375        {
1376            collisionHandler = handler;
1377        }
1378    
1379        /**
1380         * Carts should return their drag factor here
1381         * @return The drag rate.
1382         */
1383        protected double getDrag()
1384        {
1385            return riddenByEntity != null ? defaultDragRidden : defaultDragEmpty;
1386        }
1387    
1388        /**
1389         * Moved to allow overrides.
1390         * This code applies drag and updates push forces.
1391         */
1392        protected void applyDragAndPushForces()
1393        {
1394            if(isPoweredCart())
1395            {
1396                double d27 = MathHelper.sqrt_double(pushX * pushX + pushZ * pushZ);
1397                if(d27 > 0.01D)
1398                {
1399                    pushX /= d27;
1400                    pushZ /= d27;
1401                    double d29 = 0.04;
1402                    motionX *= 0.8D;
1403                    motionY *= 0.0D;
1404                    motionZ *= 0.8D;
1405                    motionX += pushX * d29;
1406                    motionZ += pushZ * d29;
1407                }
1408                else
1409                {
1410                    motionX *= 0.9D;
1411                    motionY *= 0.0D;
1412                    motionZ *= 0.9D;
1413                }
1414            }
1415            motionX *= getDrag();
1416            motionY *= 0.0D;
1417            motionZ *= getDrag();
1418        }
1419    
1420        /**
1421         * Moved to allow overrides.
1422         * This code updates push forces.
1423         */
1424        protected void updatePushForces()
1425        {
1426            if(isPoweredCart())
1427            {
1428                double push = MathHelper.sqrt_double(pushX * pushX + pushZ * pushZ);
1429                if(push > 0.01D && motionX * motionX + motionZ * motionZ > 0.001D)
1430                {
1431                    pushX /= push;
1432                    pushZ /= push;
1433                    if(pushX * motionX + pushZ * motionZ < 0.0D)
1434                    {
1435                        pushX = 0.0D;
1436                        pushZ = 0.0D;
1437                    }
1438                    else
1439                    {
1440                        pushX = motionX;
1441                        pushZ = motionZ;
1442                    }
1443                }
1444            }
1445        }
1446    
1447        /**
1448         * Moved to allow overrides.
1449         * This code handles minecart movement and speed capping when on a rail.
1450         */
1451        protected void moveMinecartOnRail(int i, int j, int k)
1452        {
1453            int id = worldObj.getBlockId(i, j, k);
1454            if (!BlockRail.isRailBlock(id))
1455            {
1456                    return;
1457            }
1458            float railMaxSpeed = ((BlockRail)Block.blocksList[id]).getRailMaxSpeed(worldObj, this, i, j, k);
1459    
1460            double maxSpeed = Math.min(railMaxSpeed, getMaxSpeedRail());
1461            double mX = motionX;
1462            double mZ = motionZ;
1463            if(riddenByEntity != null)
1464            {
1465                mX *= 0.75D;
1466                mZ *= 0.75D;
1467            }
1468            if(mX < -maxSpeed) mX = -maxSpeed;
1469            if(mX >  maxSpeed) mX =  maxSpeed;
1470            if(mZ < -maxSpeed) mZ = -maxSpeed;
1471            if(mZ >  maxSpeed) mZ =  maxSpeed;
1472            moveEntity(mX, 0.0D, mZ);
1473        }
1474    
1475        /**
1476         * Moved to allow overrides.
1477         * This code handles minecart movement and speed capping when not on a rail.
1478         */
1479        protected void moveMinecartOffRail(int i, int j, int k)
1480        {
1481            double d2 = getMaxSpeedGround();
1482            if(!onGround)
1483            {
1484                d2 = getMaxSpeedAirLateral();
1485            }
1486            if(motionX < -d2) motionX = -d2;
1487            if(motionX >  d2) motionX =  d2;
1488            if(motionZ < -d2) motionZ = -d2;
1489            if(motionZ >  d2) motionZ =  d2;
1490            double moveY = motionY;
1491            if(getMaxSpeedAirVertical() > 0 && motionY > getMaxSpeedAirVertical())
1492            {
1493                moveY = getMaxSpeedAirVertical();
1494                if(Math.abs(motionX) < 0.3f && Math.abs(motionZ) < 0.3f)
1495                {
1496                    moveY = 0.15f;
1497                    motionY = moveY;
1498                }
1499            }
1500            if(onGround)
1501            {
1502                motionX *= 0.5D;
1503                motionY *= 0.5D;
1504                motionZ *= 0.5D;
1505            }
1506            moveEntity(motionX, moveY, motionZ);
1507            if(!onGround)
1508            {
1509                motionX *= getDragAir();
1510                motionY *= getDragAir();
1511                motionZ *= getDragAir();
1512            }
1513        }
1514    
1515        /**
1516         * Moved to allow overrides.
1517         * This code applies fuel consumption.
1518         */
1519        protected void updateFuel()
1520        {
1521            if (fuel > 0) fuel--;
1522            if (fuel <= 0) pushX = pushZ = 0.0D;
1523            setMinecartPowered(fuel > 0);
1524        }
1525    
1526        /**
1527         * Moved to allow overrides, This code handle slopes affecting velocity.
1528         * @param metadata The blocks position metadata
1529         */
1530        protected void adjustSlopeVelocities(int metadata)
1531        {
1532            double acceleration = 0.0078125D;
1533            if (metadata == 2)
1534            {
1535                motionX -= acceleration;
1536            }
1537            else if (metadata == 3)
1538            {
1539                motionX += acceleration;
1540            }
1541            else if (metadata == 4)
1542            {
1543                motionZ += acceleration;
1544            }
1545            else if (metadata == 5)
1546            {
1547                motionZ -= acceleration;
1548            }
1549        }
1550    
1551        /**
1552         * Getters/setters for physics variables
1553         */
1554    
1555        /**
1556         * Returns the carts max speed.
1557         * Carts going faster than 1.1 cause issues with chunk loading.
1558         * Carts cant traverse slopes or corners at greater than 0.5 - 0.6.
1559         * This value is compared with the rails max speed to determine
1560         * the carts current max speed. A normal rails max speed is 0.4.
1561         * @return Carts max speed.
1562         */
1563        public float getMaxSpeedRail()
1564        {
1565            return maxSpeedRail;
1566        }
1567    
1568        public void setMaxSpeedRail(float value)
1569        {
1570            maxSpeedRail = value;
1571        }
1572    
1573        public float getMaxSpeedGround()
1574        {
1575            return maxSpeedGround;
1576        }
1577    
1578        public void setMaxSpeedGround(float value)
1579        {
1580            maxSpeedGround = value;
1581        }
1582    
1583        public float getMaxSpeedAirLateral()
1584        {
1585            return maxSpeedAirLateral;
1586        }
1587    
1588        public void setMaxSpeedAirLateral(float value)
1589        {
1590            maxSpeedAirLateral = value;
1591        }
1592    
1593        public float getMaxSpeedAirVertical()
1594        {
1595            return maxSpeedAirVertical;
1596        }
1597    
1598        public void setMaxSpeedAirVertical(float value)
1599        {
1600            maxSpeedAirVertical = value;
1601        }
1602    
1603        public double getDragAir()
1604        {
1605            return dragAir;
1606        }
1607    
1608        public void setDragAir(double value)
1609        {
1610            dragAir = value;
1611        }
1612    }