add advanced offsets

build.gradle

@@ -17,6 +17,7 @@ repositories {
 	// Loom adds the essential maven repositories to download Minecraft and libraries from automatically.
 	// See https://docs.gradle.org/current/userguide/declaring_repositories.html
 	// for more information about repositories.
+    mavenCentral()
 }
 
 loom {
@@ -42,7 +43,8 @@ dependencies {
 
 	// Uncomment the following line to enable the deprecated Fabric API modules.
 	// These are included in the Fabric API production distribution and allow you to update your mod to the latest modules at a later more convenient time.
-
+	include 'net.objecthunter:exp4j:0.4.8'
+	implementation 'net.objecthunter:exp4j:0.4.8'
 	// modImplementation "net.fabricmc.fabric-api:fabric-api-deprecated:${project.fabric_version}"
 }
 

src/main/java/quimufu/structure_item/MyItem.java

@@ -5,7 +5,6 @@ import net.fabricmc.fabric.api.item.v1.FabricItemSettings;
 import net.minecraft.block.Block;
 import net.minecraft.client.item.TooltipContext;
 import net.minecraft.item.Item;
-import net.minecraft.item.ItemGroup;
 import net.minecraft.item.ItemStack;
 import net.minecraft.item.ItemUsageContext;
 import net.minecraft.nbt.NbtCompound;
@@ -16,13 +15,10 @@ import net.minecraft.network.packet.s2c.play.SubtitleS2CPacket;
 import net.minecraft.network.packet.s2c.play.TitleS2CPacket;
 import net.minecraft.registry.DefaultedRegistry;
 import net.minecraft.registry.Registries;
-import net.minecraft.registry.Registry;
-import net.minecraft.registry.SimpleDefaultedRegistry;
 import net.minecraft.server.network.ServerPlayNetworkHandler;
 import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.server.world.ServerWorld;
 import net.minecraft.structure.StructureTemplate;
-import net.minecraft.text.LiteralTextContent;
 import net.minecraft.text.Text;
 import net.minecraft.util.*;
 import net.minecraft.util.math.BlockPos;
@@ -63,6 +59,17 @@ public class MyItem extends Item {
                             Text.literal(String.valueOf(offset.getY())),
                             Text.literal(String.valueOf(offset.getZ())));
                     texts.add(c);
+                } else if (tag.contains("offsetV2", 10)) {
+
+                    NbtCompound offsetV2 = tag.getCompound("offsetV2");
+
+                    texts.add(Text.translatable("item.structure_item.item.tooltip.v2.offset"));
+                    texts.add(Text.translatable("item.structure_item.item.tooltip.xFuncOff",
+                            Text.literal(String.valueOf(offsetV2.get("x")))));
+                    texts.add(Text.translatable("item.structure_item.item.tooltip.yFuncOff",
+                            Text.literal(String.valueOf(offsetV2.get("y")))));
+                    texts.add(Text.translatable("item.structure_item.item.tooltip.zFuncOff",
+                            Text.literal(String.valueOf(offsetV2.get("z")))));
                 } else {
                     texts.add(Text.translatable("item.structure_item.item.tooltip.dynamic.offset"));
                 }
@@ -91,6 +98,7 @@ public class MyItem extends Item {
                 }
             }
         }
+
     }
 
     @Override
@@ -162,12 +170,23 @@ public class MyItem extends Item {
             if (tag.contains("offset", 10)) {
                 BlockPos offset = NbtHelper.toBlockPos(tag.getCompound("offset"));
                 loc = loc.add(offset);
-            } else if (c.getPlayer() != null) {
+            } else if (tag.contains("offsetV2", 10)) {
-                Direction direction = Direction.getEntityFacingOrder(c.getPlayer())[0];
+                Direction direction = c.getSide().getOpposite();
+                try {
+                    StructureOffsetSettings offset = StructureOffsetSettings.ofTag(tag.getCompound("offsetV2"));
                     Vec3i size = x.getSize();
-                loc = loc.add(getDirectionalOffset(direction, size));
+                    loc = loc.add(offset.getEffective(direction, size));
+                } catch (Exception e) {
+                    Text message =
+                            Text.translatable("items.structure.spawner.invalid.offsetV2",
+                                    Text.literal(tag.getCompound("offsetV2").asString()), e.getMessage());
+                    sendPlayerChat(player, message);
+                }
             } else {
-                LOGGER.info("No player & no offset");
+                Direction direction = c.getSide().getOpposite();
+                StructureOffsetSettings offset = StructureOffsetSettings.dynamic();
+                Vec3i size = x.getSize();
+                loc = loc.add(offset.getEffective(direction, size));
             }
 
             MyPlacementSettings ps = (new MyPlacementSettings());
@@ -232,35 +251,6 @@ public class MyItem extends Item {
         LOGGER.info(message.getContent());
     }
 
-    private BlockPos getDirectionalOffset(Direction direction, Vec3i size) {
-        BlockPos loc = new BlockPos(0, 0, 0);
-        switch (direction) {
-            case WEST -> {
-                loc = loc.offset(Direction.NORTH, size.getZ() / 2);
-                loc = loc.offset(Direction.WEST, size.getX() - 1);
-            }
-            case EAST -> //positive x
-                    loc = loc.offset(Direction.NORTH, size.getZ() / 2);
-            case NORTH -> {
-                loc = loc.offset(Direction.NORTH, size.getZ() - 1);
-                loc = loc.offset(Direction.WEST, size.getX() / 2);
-            }
-            case SOUTH -> //positive z
-                    loc = loc.offset(Direction.WEST, size.getX() / 2);
-            case UP -> {    //positive y
-                loc = loc.offset(Direction.NORTH, size.getZ() / 2);
-                loc = loc.offset(Direction.WEST, size.getX() / 2);
-                loc = loc.offset(Direction.UP);
-            }
-            case DOWN -> {
-                loc = loc.offset(Direction.NORTH, size.getZ() / 2);
-                loc = loc.offset(Direction.WEST, size.getX() / 2);
-                loc = loc.offset(Direction.DOWN, size.getY());
-            }
-        }
-        return loc;
-    }
-
     private Block getBlock(String loc) {
         Identifier location = Identifier.tryParse(loc);
         DefaultedRegistry<Block> blocks = Registries.BLOCK;

src/main/java/quimufu/structure_item/StructureOffsetSettings.java

@@ -0,0 +1,112 @@
+package quimufu.structure_item;
+
+import net.minecraft.nbt.NbtCompound;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
+import net.minecraft.util.math.MathHelper;
+import net.minecraft.util.math.Vec3i;
+import net.objecthunter.exp4j.Expression;
+import net.objecthunter.exp4j.ExpressionBuilder;
+import net.objecthunter.exp4j.function.Function;
+
+import java.util.Arrays;
+import java.util.Map;
+
+public class StructureOffsetSettings {
+
+    Expression[] xyz = new Expression[3];
+    String[] xyzS = new String[3];
+    boolean[] rel = new boolean[3];
+    static Function DIR_SELECT = new Function("dirSelect", 7) {
+        @Override
+        public double apply(double... args) {
+            return args[(int) (Math.round(args[0]) + 1L)];
+        }
+    };
+
+    public static StructureOffsetSettings ofTag(NbtCompound offsetTag) {
+        StructureOffsetSettings settings = new StructureOffsetSettings();
+        String x1 = offsetTag.getString("x");
+        unwrap(x1, settings, 0);
+        String y1 = offsetTag.getString("y");
+        unwrap(y1, settings, 1);
+        String z1 = offsetTag.getString("z");
+        unwrap(z1, settings, 2);
+        return settings;
+    }
+
+    private static void unwrap(String expr, StructureOffsetSettings settings, int x) {
+        if (expr.startsWith("~")) {
+            settings.rel[x] = true;
+            expr = expr.substring(1);
+        }
+        if (expr.isBlank()) {
+            expr = "0";
+        }
+        settings.xyzS[x] = expr;
+        settings.xyz[x] = new ExpressionBuilder(expr)
+                .variables("sizeX", "sizeY", "sizeZ", "dir")
+                .function(DIR_SELECT)
+                .build();
+    }
+
+    public static StructureOffsetSettings dynamic() {
+        StructureOffsetSettings settings = new StructureOffsetSettings();
+        for (int i = 0; i < 3; i++) {
+            settings.xyz[i] = new ExpressionBuilder("0").build();
+            settings.xyzS[i] = "0";
+        }
+        Arrays.fill(settings.rel, true);
+        return settings;
+    }
+
+    public Vec3i getEffective(Direction direction, Vec3i size) {
+        int[] xyzI = new int[3];
+        for (int i = 0; i < 3; i++) {
+            xyz[i].setVariables(Map.of("sizeX", (double) size.getX(),
+                    "sizeY", (double) size.getY(),
+                    "sizeZ", (double) size.getZ(),
+                    "dir", (double) direction.getId()
+            ));
+            xyzI[i] = MathHelper.floor(xyz[i].evaluate());
+        }
+        Vec3i dynamicOffset = getDirectionalOffset(direction, size);
+
+        int[] xyzDynamicI = {dynamicOffset.getX(), dynamicOffset.getY(), dynamicOffset.getZ()};
+        for (int i = 0; i < 3; i++) {
+            if (rel[i]) {
+                xyzI[i] += xyzDynamicI[i];
+            }
+        }
+        return new Vec3i(xyzI[0], xyzI[1], xyzI[2]);
+    }
+
+    private Vec3i getDirectionalOffset(Direction direction, Vec3i size) {
+        BlockPos loc = new BlockPos(0, 0, 0);
+        switch (direction) {
+            case WEST -> {
+                loc = loc.offset(Direction.NORTH, size.getZ() / 2);
+                loc = loc.offset(Direction.WEST, size.getX() - 1);
+            }
+            case EAST -> //positive x
+                    loc = loc.offset(Direction.NORTH, size.getZ() / 2);
+            case NORTH -> {
+                loc = loc.offset(Direction.NORTH, size.getZ() - 1);
+                loc = loc.offset(Direction.WEST, size.getX() / 2);
+            }
+            case SOUTH -> //positive z
+                    loc = loc.offset(Direction.WEST, size.getX() / 2);
+            case UP -> {    //positive y
+                loc = loc.offset(Direction.NORTH, size.getZ() / 2);
+                loc = loc.offset(Direction.WEST, size.getX() / 2);
+                loc = loc.offset(Direction.UP);
+            }
+            case DOWN -> {
+                loc = loc.offset(Direction.NORTH, size.getZ() / 2);
+                loc = loc.offset(Direction.WEST, size.getX() / 2);
+                loc = loc.offset(Direction.DOWN, size.getY());
+            }
+        }
+        return loc;
+    }
+}

src/main/resources/assets/structure_item/lang/en_us.json

@@ -4,6 +4,7 @@
   "items.structure.spawner.invalid.structure.name": "Invalid structure name",
   "items.structure.spawner.structure.nonexistent": "Structure: %s does not exist",
   "items.structure.spawner.invalid.block": "Block %s invalid",
+  "items.structure.spawner.invalid.offsetV2": "offsetV2 tag %s invalid: %s",
   "items.structure.spawner.no.tag": "Item has no NBT tag",
   "items.structure.spawner.no.structure": "Item has no String \"structure\": tag",
   "item.structure_item.item": "Structure Spawner",
@@ -11,7 +12,11 @@
   "item.structure_item.item.tooltip.structure": "Places down: ",
   "item.structure_item.item.tooltip.allowed.on": "Can be placed on: ",
   "item.structure_item.item.tooltip.fixed.offset": "Offset:",
+  "item.structure_item.item.tooltip.v2.offset": "Advanced Offset:",
   "item.structure_item.item.tooltip.xyz":"  x: %s y: %s z: %s",
+  "item.structure_item.item.tooltip.xFuncOff":"  x: %s",
+  "item.structure_item.item.tooltip.yFuncOff":"  y: %s",
+  "item.structure_item.item.tooltip.zFuncOff":"  z: %s",
   "item.structure_item.item.tooltip.dynamic.offset": "Dynamic offset",
   "item.structure_item.item.tooltip.blacklist": "Blacklist:",
   "item.structure_item.item.tooltip.blacklist.more": "  And %s more...",