Fix chain cogwheels not connecting to each other via cogwheels (#51)

src/main/java/com/hlysine/create_connected/mixin/chaincogwheel/RotationPropagatorMixin.java

@@ -0,0 +1,54 @@
+package com.hlysine.create_connected.mixin.chaincogwheel;
+
+import com.hlysine.create_connected.CCBlocks;
+import com.simibubi.create.content.kinetics.RotationPropagator;
+import com.simibubi.create.content.kinetics.base.IRotate;
+import com.simibubi.create.content.kinetics.base.KineticBlockEntity;
+import com.simibubi.create.content.kinetics.chainDrive.ChainDriveBlock;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.state.BlockState;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(value = RotationPropagator.class, remap = false)
+public class RotationPropagatorMixin {
+    @Inject(
+            method = "getRotationSpeedModifier(Lcom/simibubi/create/content/kinetics/base/KineticBlockEntity;Lcom/simibubi/create/content/kinetics/base/KineticBlockEntity;)F",
+            at = @At(value = "INVOKE", target = "Lcom/simibubi/create/content/kinetics/chainDrive/ChainDriveBlock;areBlocksConnected(Lnet/minecraft/world/level/block/state/BlockState;Lnet/minecraft/world/level/block/state/BlockState;Lnet/minecraft/core/Direction;)Z"),
+            cancellable = true
+    )
+    private static void handleChainCogwheels(KineticBlockEntity from,
+                                             KineticBlockEntity to,
+                                             CallbackInfoReturnable<Float> cir) {
+        final BlockState stateFrom = from.getBlockState();
+        final BlockState stateTo = to.getBlockState();
+        Block fromBlock = stateFrom.getBlock();
+        Block toBlock = stateTo.getBlock();
+        final IRotate definitionFrom = (IRotate) fromBlock;
+        final IRotate definitionTo = (IRotate) toBlock;
+        final BlockPos diff = to.getBlockPos()
+                .subtract(from.getBlockPos());
+        final Direction direction = Direction.getNearest(diff.getX(), diff.getY(), diff.getZ());
+
+        if (stateFrom.is(CCBlocks.ENCASED_CHAIN_COGWHEEL.get()) && stateTo.is(CCBlocks.ENCASED_CHAIN_COGWHEEL.get())) {
+            boolean connected = ChainDriveBlock.areBlocksConnected(stateFrom, stateTo, direction);
+            if (!connected) {
+                if (diff.distManhattan(BlockPos.ZERO) != 1) {
+                    cir.setReturnValue(0f);
+                    return;
+                }
+                if (direction.getAxis() == definitionFrom.getRotationAxis(stateFrom)) {
+                    cir.setReturnValue(0f);
+                    return;
+                }
+                if (definitionFrom.getRotationAxis(stateFrom) == definitionTo.getRotationAxis(stateTo)) {
+                    cir.setReturnValue(-1f);
+                }
+            }
+        }
+    }
+}

src/main/resources/create_connected.mixins.json

@@ -9,6 +9,7 @@
     "ItemUseOverridesMixin",
     "KineticBlockAdvancementMixin",
     "ManualApplicationRecipeMixin",
+    "chaincogwheel.RotationPropagatorMixin",
     "compat.CopycatBlockEntityMixin",
     "compat.CopycatBlockMixin",
     "contraption.AbstractContainerMenuMixin",