Purpur/patches/server/0033-Controllable-Minecarts.patch

From a98890923c56ac158742afa544cc5957a4194fad Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Sat, 29 Jun 2019 02:32:40 -0500
Subject: [PATCH] Controllable Minecarts

---
 .../java/net/minecraft/server/Entity.java     |  1 +
 .../server/EntityMinecartAbstract.java        | 38 +++++++++++++++++++
 .../net/minecraft/server/ItemMinecart.java    |  8 ++--
 .../net/pl3x/purpur/PurpurWorldConfig.java    | 32 ++++++++++++++++
 4 files changed, 76 insertions(+), 3 deletions(-)

diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index 1c96e1b02..2d793eb59 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -1287,6 +1287,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
         this.inLava = true;
     }
 
+    public boolean isInLava() { return aH(); } // Purpur - OBFHELPER
     public boolean aH() {
         return this.inLava;
     }
diff --git a/src/main/java/net/minecraft/server/EntityMinecartAbstract.java b/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
index 665bbe07f..1f3e5bd28 100644
--- a/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
+++ b/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
@@ -357,12 +357,50 @@ public abstract class EntityMinecartAbstract extends Entity {
 
     public void a(int i, int j, int k, boolean flag) {}
 
+    // Purpur start
+    public double getControllableSpeed() {
+        BlockPosition position = new BlockPosition(this);
+        Block block = world.getType(position).getBlock();
+        if (!block.material.isSolid()) {
+            block = world.getType(position.shift(EnumDirection.DOWN)).getBlock();
+        }
+        Double speed = world.purpurConfig.controllableMinecartsBlockSpeeds.get(block);
+        if (speed == null) {
+            speed = world.purpurConfig.controllableMinecartsBaseSpeed;
+        }
+        return speed;
+    }
+    // Purpur end
+
     protected void i() {
         double d0 = this.getMaxSpeed();
         Vec3D vec3d = this.getMot();
 
         this.setMot(MathHelper.a(vec3d.x, -d0, d0), vec3d.y, MathHelper.a(vec3d.z, -d0, d0));
         if (this.onGround) {
+            // Purpur start
+            if (world.purpurConfig.controllableMinecarts && !isInWater() && !isInLava() && !passengers.isEmpty()) {
+                Entity passenger = passengers.get(0);
+                if (passenger instanceof EntityHuman) {
+                    EntityHuman entityhuman = (EntityHuman) passenger;
+                    if (entityhuman.jumping) {
+                        Vec3D mot = getMot();
+                        setMot(mot.x, world.purpurConfig.controllableMinecartsHopBoost, mot.z);
+                    }
+                    if (entityhuman.getForward() != 0.0F) {
+                        Vector dir = entityhuman.getBukkitEntity().getEyeLocation().getDirection().normalize().multiply(getControllableSpeed());
+                        if (entityhuman.getForward() < 0.0) {
+                            dir.multiply(-0.5);
+                        }
+                        setMot(new Vec3D(dir.getX(), getMot().y, dir.getZ()));
+                        setStepHeight(world.purpurConfig.controllableMinecartsStepHeight);
+                    } else {
+                        setStepHeight(0.0F);
+                    }
+                    this.yaw = passenger.yaw - 90;
+                }
+            }
+            // Purpur end
             // CraftBukkit start - replace magic numbers with our variables
             this.setMot(new Vec3D(this.getMot().x * this.derailedX, this.getMot().y * this.derailedY, this.getMot().z * this.derailedZ));
             // CraftBukkit end
diff --git a/src/main/java/net/minecraft/server/ItemMinecart.java b/src/main/java/net/minecraft/server/ItemMinecart.java
index b73e317fb..e1337a9c0 100644
--- a/src/main/java/net/minecraft/server/ItemMinecart.java
+++ b/src/main/java/net/minecraft/server/ItemMinecart.java
@@ -103,8 +103,10 @@ public class ItemMinecart extends Item {
         IBlockData iblockdata = world.getType(blockposition);
 
         if (!iblockdata.a(TagsBlock.RAILS)) {
-            return EnumInteractionResult.FAIL;
-        } else {
+            // Purpur start - place minecarts anywhere
+            if (!world.purpurConfig.controllableMinecartsPlaceAnywhere) return EnumInteractionResult.FAIL;
+            if (iblockdata.getMaterial().isSolid()) blockposition = blockposition.shift(itemactioncontext.getClickedFace());
+        } //else { // Purpur end - place minecarts anywhere
             ItemStack itemstack = itemactioncontext.getItemStack();
 
             if (!world.isClientSide) {
@@ -131,6 +133,6 @@ public class ItemMinecart extends Item {
 
             itemstack.subtract(1);
             return EnumInteractionResult.SUCCESS;
-        }
+        //} // Purpur - place minecarts anywhere
     }
 }
diff --git a/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java b/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
index 08cef8e64..086bd505c 100644
--- a/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
+++ b/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
@@ -1,10 +1,16 @@
 package net.pl3x.purpur;
 
 import com.destroystokyo.paper.PaperWorldConfig;
+import net.minecraft.server.Block;
+import net.minecraft.server.Blocks;
+import net.minecraft.server.IRegistry;
+import net.minecraft.server.MinecraftKey;
 import org.bukkit.configuration.ConfigurationSection;
 import org.spigotmc.SpigotWorldConfig;
 
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 import static net.pl3x.purpur.PurpurConfig.log;
 
@@ -84,6 +90,32 @@ public class PurpurWorldConfig {
         turtleEggsBreakFromMinecarts = getBoolean("blocks.turtle_egg.break-from-minecarts", turtleEggsBreakFromMinecarts);
     }
 
+    public boolean controllableMinecarts = false;
+    public boolean controllableMinecartsPlaceAnywhere = false;
+    public float controllableMinecartsStepHeight = 1.0F;
+    public double controllableMinecartsHopBoost = 0.5D;
+    public double controllableMinecartsBaseSpeed = 0.1D;
+    public Map<Block, Double> controllableMinecartsBlockSpeeds = new HashMap<>();
+    private void gameplayMechanicsSettings() {
+        controllableMinecarts = getBoolean("gameplay-mechanics.controllable-minecarts.enabled", controllableMinecarts);
+        controllableMinecartsPlaceAnywhere = getBoolean("gameplay-mechanics.controllable-minecarts.place-anywhere", controllableMinecartsPlaceAnywhere);
+        controllableMinecartsStepHeight = (float) getDouble("gameplay-mechanics.controllable-minecarts.step-height", controllableMinecartsStepHeight);
+        controllableMinecartsHopBoost = getDouble("gameplay-mechanics.controllable-minecarts.hop-boost", controllableMinecartsHopBoost);
+        controllableMinecartsBaseSpeed = getDouble("gameplay-mechanics.controllable-minecarts.base-speed", controllableMinecartsBaseSpeed);
+        ConfigurationSection section = getConfigurationSection("gameplay-mechanics.controllable-minecarts.block-speed");
+        if (section != null) {
+            for (String key : section.getKeys(false)) {
+                Block block = IRegistry.BLOCK.get(new MinecraftKey(key));
+                if (block != Blocks.AIR) {
+                    controllableMinecartsBlockSpeeds.put(block, section.getDouble(key, controllableMinecartsBaseSpeed));
+                }
+            }
+        } else {
+            set("gameplay-mechanics.controllable-minecarts.block-speed.grass-block", 0.3D);
+            set("gameplay-mechanics.controllable-minecarts.block-speed.stone", 0.5D);
+        }
+    }
+
     public boolean batRidable = false;
     public boolean batRidableInWater = false;
     public boolean batRequireShiftToMount = true;
-- 
2.24.0