craftbukkit/nms-patches/net/minecraft/world/entity/vehicle/EntityMinecartAbstract.patch

--- a/net/minecraft/world/entity/vehicle/EntityMinecartAbstract.java
+++ b/net/minecraft/world/entity/vehicle/EntityMinecartAbstract.java
@@ -43,6 +43,14 @@
 import net.minecraft.world.phys.AxisAlignedBB;
 import net.minecraft.world.phys.Vec3D;
 
+// CraftBukkit start
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.util.CraftLocation;
+import org.bukkit.entity.Vehicle;
+import org.bukkit.event.vehicle.VehicleEntityCollisionEvent;
+import org.bukkit.util.Vector;
+// CraftBukkit end
+
 public abstract class EntityMinecartAbstract extends VehicleEntity {
 
     private static final Vec3D LOWERED_PASSENGER_ATTACHMENT = new Vec3D(0.0D, 0.0D, 0.0D);
@@ -76,6 +84,17 @@
         enummap.put(BlockPropertyTrackPosition.NORTH_EAST, Pair.of(baseblockposition2, baseblockposition1));
     });
 
+    // CraftBukkit start
+    public boolean slowWhenEmpty = true;
+    private double derailedX = 0.5;
+    private double derailedY = 0.5;
+    private double derailedZ = 0.5;
+    private double flyingX = 0.95;
+    private double flyingY = 0.95;
+    private double flyingZ = 0.95;
+    public Double maxSpeed;
+    // CraftBukkit end
+
     protected EntityMinecartAbstract(EntityTypes<?> entitytypes, World world) {
         super(entitytypes, world);
         this.blocksBuilding = true;
@@ -101,7 +120,7 @@
 
     @Nullable
     public static <T extends EntityMinecartAbstract> T createMinecart(World world, double d0, double d1, double d2, EntityTypes<T> entitytypes, EntitySpawnReason entityspawnreason, ItemStack itemstack, @Nullable EntityHuman entityhuman) {
-        T t0 = (EntityMinecartAbstract) entitytypes.create(world, entityspawnreason);
+        T t0 = (T) entitytypes.create(world, entityspawnreason); // CraftBukkit - decompile error
 
         if (t0 != null) {
             t0.setInitialPos(d0, d1, d2);
@@ -262,6 +281,14 @@
 
     @Override
     public void tick() {
+        // CraftBukkit start
+        double prevX = this.getX();
+        double prevY = this.getY();
+        double prevZ = this.getZ();
+        float prevYaw = this.getYRot();
+        float prevPitch = this.getXRot();
+        // CraftBukkit end
+
         if (this.getHurtTime() > 0) {
             this.setHurtTime(this.getHurtTime() - 1);
         }
@@ -271,8 +298,20 @@
         }
 
         this.checkBelowWorld();
-        this.handlePortal();
+        // this.handlePortal(); // CraftBukkit - handled in postTick
         this.behavior.tick();
+        // CraftBukkit start
+        org.bukkit.World bworld = this.level().getWorld();
+        Location from = new Location(bworld, prevX, prevY, prevZ, prevYaw, prevPitch);
+        Location to = CraftLocation.toBukkit(this.position(), bworld, this.getYRot(), this.getXRot());
+        Vehicle vehicle = (Vehicle) this.getBukkitEntity();
+
+        this.level().getCraftServer().getPluginManager().callEvent(new org.bukkit.event.vehicle.VehicleUpdateEvent(vehicle));
+
+        if (!from.equals(to)) {
+            this.level().getCraftServer().getPluginManager().callEvent(new org.bukkit.event.vehicle.VehicleMoveEvent(vehicle, from, to));
+        }
+        // CraftBukkit end
         this.updateInWaterStateAndDoFluidPushing();
         if (this.isInLava()) {
             this.lavaHurt();
@@ -385,12 +424,16 @@
 
         this.setDeltaMovement(MathHelper.clamp(vec3d.x, -d0, d0), vec3d.y, MathHelper.clamp(vec3d.z, -d0, d0));
         if (this.onGround()) {
-            this.setDeltaMovement(this.getDeltaMovement().scale(0.5D));
+            // CraftBukkit start - replace magic numbers with our variables
+            this.setDeltaMovement(new Vec3D(this.getDeltaMovement().x * this.derailedX, this.getDeltaMovement().y * this.derailedY, this.getDeltaMovement().z * this.derailedZ));
+            // CraftBukkit end
         }
 
         this.move(EnumMoveType.SELF, this.getDeltaMovement());
         if (!this.onGround()) {
-            this.setDeltaMovement(this.getDeltaMovement().scale(0.95D));
+            // CraftBukkit start - replace magic numbers with our variables
+            this.setDeltaMovement(new Vec3D(this.getDeltaMovement().x * this.flyingX, this.getDeltaMovement().y * this.flyingY, this.getDeltaMovement().z * this.flyingZ));
+            // CraftBukkit end
         }
 
     }
@@ -521,6 +564,14 @@
         if (!this.level().isClientSide) {
             if (!entity.noPhysics && !this.noPhysics) {
                 if (!this.hasPassenger(entity)) {
+                    // CraftBukkit start
+                    VehicleEntityCollisionEvent collisionEvent = new VehicleEntityCollisionEvent((Vehicle) this.getBukkitEntity(), entity.getBukkitEntity());
+                    this.level().getCraftServer().getPluginManager().callEvent(collisionEvent);
+
+                    if (collisionEvent.isCancelled()) {
+                        return;
+                    }
+                    // CraftBukkit end
                     double d0 = entity.getX() - this.getX();
                     double d1 = entity.getZ() - this.getZ();
                     double d2 = d0 * d0 + d1 * d1;
@@ -645,4 +696,26 @@
     public boolean isFurnace() {
         return false;
     }
+
+    // CraftBukkit start - Methods for getting and setting flying and derailed velocity modifiers
+    public Vector getFlyingVelocityMod() {
+        return new Vector(flyingX, flyingY, flyingZ);
+    }
+
+    public void setFlyingVelocityMod(Vector flying) {
+        flyingX = flying.getX();
+        flyingY = flying.getY();
+        flyingZ = flying.getZ();
+    }
+
+    public Vector getDerailedVelocityMod() {
+        return new Vector(derailedX, derailedY, derailedZ);
+    }
+
+    public void setDerailedVelocityMod(Vector derailed) {
+        derailedX = derailed.getX();
+        derailedY = derailed.getY();
+        derailedZ = derailed.getZ();
+    }
+    // CraftBukkit end
 }