flood fill

src/main/java/net/brokenmoon/redcontrol/RedControl.java

@@ -1,5 +1,6 @@
 package net.brokenmoon.redcontrol;
 
+import net.brokenmoon.redcontrol.api.events.BlockModificationEvents;
 import net.brokenmoon.redcontrol.blockentities.CpuEntity;
 import net.brokenmoon.redcontrol.blockentities.DriveEntity;
 import net.brokenmoon.redcontrol.blocks.CpuBlock;
@@ -7,6 +8,7 @@ import net.brokenmoon.redcontrol.blocks.DriveBlock;
 import net.brokenmoon.redcontrol.blocks.TerminalBlock;
 import net.brokenmoon.redcontrol.blocks.TerminalEntity;
 import net.brokenmoon.redcontrol.item.FloppyDisk;
+import net.brokenmoon.redcontrol.util.FloodFill;
 import net.fabricmc.api.ModInitializer;
 
 import net.fabricmc.fabric.api.item.v1.FabricItemSettings;
@@ -16,6 +18,7 @@ import net.fabricmc.fabric.api.object.builder.v1.block.FabricBlockSettings;
 import net.fabricmc.fabric.api.object.builder.v1.block.entity.FabricBlockEntityTypeBuilder;
 import net.fabricmc.fabric.api.resource.ResourceManagerHelper;
 import net.fabricmc.fabric.api.resource.SimpleSynchronousResourceReloadListener;
+import net.minecraft.block.Block;
 import net.minecraft.block.entity.BlockEntity;
 import net.minecraft.block.entity.BlockEntityType;
 import net.minecraft.item.BlockItem;
@@ -23,14 +26,19 @@ import net.minecraft.item.Item;
 import net.minecraft.item.ItemGroup;
 import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NbtCompound;
+import net.minecraft.particle.ParticleTypes;
 import net.minecraft.registry.Registry;
 import net.minecraft.registry.Registries;
+import net.minecraft.registry.RegistryKeys;
+import net.minecraft.registry.tag.TagKey;
 import net.minecraft.resource.Resource;
 import net.minecraft.resource.ResourceManager;
 import net.minecraft.resource.ResourceType;
+import net.minecraft.server.world.ServerWorld;
 import net.minecraft.text.Text;
 import net.minecraft.util.Identifier;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Vec3d;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -43,8 +51,13 @@ public class RedControl implements ModInitializer {
 	// It is considered best practice to use your mod id as the logger's name.
 	// That way, it's clear which mod wrote info, warnings, and errors.
     public static final Logger LOGGER = LoggerFactory.getLogger("redcontrol");
+
+	//A hashmap of files contained in images
 	public static final HashMap<String,byte[]> images = new HashMap<>();
 
+	//Tags
+	public static final TagKey<Block> TAG_BUSABLE = TagKey.of(RegistryKeys.BLOCK, modloc("bus_conductive"));
+
 	//Blocks
 	public static final CpuBlock CPU = new CpuBlock(FabricBlockSettings.create().strength(4.0f));
 	public static final TerminalBlock TERMINAL = new TerminalBlock(FabricBlockSettings.create().strength(4.0f));
@@ -169,6 +182,19 @@ public class RedControl implements ModInitializer {
 				te.pushKey(key);
 			}
 		})));
+
+		BlockModificationEvents.ON_CHANGE.register((world,blockPos,oldState,newState) -> {
+			if (oldState.isIn(TAG_BUSABLE) ^ newState.isIn(TAG_BUSABLE)) {
+				Vec3d center = blockPos.toCenterPos();
+				((ServerWorld)world).spawnParticles(ParticleTypes.CRIT,center.x,center.y,center.z,30,0.1,0.1,0.1,0.1);
+				if (newState.isIn(TAG_BUSABLE)) {
+					//a bus-block was placed
+					FloodFill.INSTANCE.blockFloodFiller((ServerWorld) world,blockPos);
+				} else {
+					//a bus block was removed
+				}
+			}
+		});
 	}
 
 	static Identifier modloc(String path) {return new Identifier("redcontrol",path);}

src/main/java/net/brokenmoon/redcontrol/util/FloodFill.kt

@@ -0,0 +1,25 @@
+package net.brokenmoon.redcontrol.util
+
+import net.brokenmoon.redcontrol.RedControl
+import net.minecraft.particle.ParticleTypes
+import net.minecraft.server.world.ServerWorld
+import net.minecraft.util.math.BlockPos
+import net.minecraft.util.math.Direction
+
+object FloodFill {
+    fun blockFloodFiller(world: ServerWorld, seed: BlockPos) {
+        val checkable = mutableListOf(seed)
+        val seen = mutableListOf<BlockPos>()
+        while (checkable.isNotEmpty()) {
+            val pos = checkable.removeFirst()
+            if (pos in seen) {continue}
+            if (!world.getBlockState(pos).isIn(RedControl.TAG_BUSABLE)){continue}
+            val cpos = pos.toCenterPos()
+            world.spawnParticles(ParticleTypes.CHERRY_LEAVES,cpos.x,cpos.y,cpos.z,20,0.2,0.2,0.2,0.2)
+            Direction.entries.forEach {
+                checkable.add(pos.add(it.offsetX,it.offsetY,it.offsetZ))
+            }
+            seen.add(pos)
+        }
+    }
+}

src/main/resources/data/redcontrol/tags/blocks/bus_conductive.json

@@ -1,3 +1,4 @@
 {
+  "replace": false,
   "values": ["minecraft:glass"]
 }

src/main/resources/redcontrol.mixins.json

@@ -7,7 +7,8 @@
     "CpuAccessor",
     "ExampleMixin",
     "MemoryAccessor",
-    "RedBusAccessor"
+    "RedBusAccessor",
+    "WorldMixin"
   ],
   "injectors": {
     "defaultRequire": 1