使手持撬棍时预览集装箱所需空间大小

src/main/java/com/atsuishio/superbwarfare/block/ContainerBlock.java

@@ -85,7 +85,7 @@ public class ContainerBlock extends BaseEntityBlock {
         return containerBlockEntity.entity != null || containerBlockEntity.entityType != null;
     }
 
-    public boolean canOpen(Level pLevel, BlockPos pPos, EntityType<?> entityType, Entity entity) {
+    public static boolean canOpen(Level pLevel, BlockPos pPos, EntityType<?> entityType, Entity entity) {
         boolean flag = true;
 
         int w = 0;
@@ -131,8 +131,7 @@ public class ContainerBlock extends BaseEntityBlock {
     public void appendHoverText(ItemStack pStack, @Nullable BlockGetter pLevel, List<Component> pTooltip, TooltipFlag pFlag) {
         super.appendHoverText(pStack, pLevel, pTooltip, pFlag);
         CompoundTag tag = BlockItem.getBlockEntityData(pStack);
-        if (tag != null) {
+        if (tag != null && tag.contains("EntityType")) {
-            if (tag.contains("EntityType")) {
             String s = getTranslationKey(tag.getString("EntityType"));
             pTooltip.add(Component.translatable(s == null ? "des.superbwarfare.container.empty" : s).withStyle(ChatFormatting.GRAY));
 
@@ -158,7 +157,6 @@ public class ContainerBlock extends BaseEntityBlock {
             }
         }
     }
-    }
 
     @Nullable
     public String getTranslationKey(String path) {

src/main/java/com/atsuishio/superbwarfare/client/renderer/special/ContainerBlockPreview.java

@@ -0,0 +1,129 @@
+package com.atsuishio.superbwarfare.client.renderer.special;
+
+import com.atsuishio.superbwarfare.block.ContainerBlock;
+import com.atsuishio.superbwarfare.block.entity.ContainerBlockEntity;
+import com.atsuishio.superbwarfare.client.renderer.CustomRenderType;
+import com.atsuishio.superbwarfare.item.Crowbar;
+import net.minecraft.client.Minecraft;
+import net.minecraft.world.level.ClipContext;
+import net.minecraft.world.phys.AABB;
+import net.minecraft.world.phys.BlockHitResult;
+import net.minecraftforge.api.distmarker.Dist;
+import net.minecraftforge.client.event.RenderLevelStageEvent;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+import net.minecraftforge.fml.common.Mod;
+
+@Mod.EventBusSubscriber(bus = Mod.EventBusSubscriber.Bus.FORGE, value = Dist.CLIENT)
+public class ContainerBlockPreview {
+    @SubscribeEvent
+    public static void render(RenderLevelStageEvent event) {
+        if (event.getStage() != RenderLevelStageEvent.Stage.AFTER_TRANSLUCENT_BLOCKS) {
+            return;
+        }
+
+        var player = Minecraft.getInstance().player;
+        assert player != null;
+
+        // 仅在手持撬棍时检测
+        var item = player.getMainHandItem();
+        if (!(item.getItem() instanceof Crowbar)) return;
+
+        var level = player.level();
+        var look = player.getLookAngle();
+
+        // 查找玩家看向方块
+        int distance = 32;
+        var start = player.position().add(0, player.getEyeHeight(), 0);
+        var end = player.position().add(look.x * distance, look.y * distance + player.getEyeHeight(), look.z * distance);
+        var context = new ClipContext(start, end, ClipContext.Block.COLLIDER, ClipContext.Fluid.NONE, player);
+        var result = player.level().clip(context);
+
+        if (result.getType().equals(BlockHitResult.Type.MISS)) return;
+
+        // 获取集装箱
+        var blockEntity = level.getBlockEntity(result.getBlockPos());
+        if (!(blockEntity instanceof ContainerBlockEntity container)) return;
+
+        // 获取实体信息
+        var entityType = container.entityType;
+        var entity = container.entity;
+
+        int w = 0, h = 0;
+        if (entityType != null) {
+            w = (int) (entityType.getDimensions().width / 2 + 1);
+            h = (int) (entityType.getDimensions().height + 1);
+        }
+        if (entity != null) {
+            w = (int) (entity.getType().getDimensions().width / 2 + 1);
+            h = (int) (entity.getType().getDimensions().height + 1);
+        }
+        if (w == 0 || h == 0) return;
+
+        var poseStack = event.getPoseStack();
+        poseStack.pushPose();
+        var pos = container.getBlockPos();
+        var view = Minecraft.getInstance().gameRenderer.getMainCamera().getPosition();
+        poseStack.translate(pos.getX() - view.x, pos.getY() - view.y + 1, pos.getZ() - view.z);
+
+        // 什么b位置
+        var aabb = new AABB(pos)
+                .inflate(w, 0, w)
+                .expandTowards(0, h - 1, 0)
+                .move(0, -1, 0);
+
+        float startX = (float) aabb.minX - 0.001f - pos.getX();
+        float startY = (float) aabb.minY - 0.001f - pos.getY();
+        float startZ = (float) aabb.minZ - 0.001f - pos.getZ();
+        float endX = (float) aabb.maxX + 0.001f - pos.getX();
+        float endY = (float) aabb.maxY + 0.001f - pos.getY();
+        float endZ = (float) aabb.maxZ + 0.001f - pos.getZ();
+
+        var hasEnoughSpace = ContainerBlock.canOpen(level, pos, entityType, entity);
+
+        var red = hasEnoughSpace ? 0 : 1;
+        var green = 1 - red;
+        var blue = 0.0f;
+        var alpha = 0.2f;
+
+        var builder = Minecraft.getInstance().renderBuffers().bufferSource().getBuffer(CustomRenderType.BLOCK_OVERLAY);
+        var m4f = poseStack.last().pose();
+
+        // east
+        builder.vertex(m4f, startX, startY, startZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, startX, endY, startZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, endX, endY, startZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, endX, startY, startZ).color(red, green, blue, alpha).endVertex();
+
+        // west
+        builder.vertex(m4f, startX, startY, endZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, endX, startY, endZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, endX, endY, endZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, startX, endY, endZ).color(red, green, blue, alpha).endVertex();
+
+        // south
+        builder.vertex(m4f, endX, startY, startZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, endX, endY, startZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, endX, endY, endZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, endX, startY, endZ).color(red, green, blue, alpha).endVertex();
+
+        // north
+        builder.vertex(m4f, startX, startY, startZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, startX, startY, endZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, startX, endY, endZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, startX, endY, startZ).color(red, green, blue, alpha).endVertex();
+
+        // top
+        builder.vertex(m4f, startX, endY, startZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, endX, endY, startZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, endX, endY, endZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, startX, endY, endZ).color(red, green, blue, alpha).endVertex();
+
+        // bottom
+        builder.vertex(m4f, startX, startY, startZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, endX, startY, startZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, endX, startY, endZ).color(red, green, blue, alpha).endVertex();
+        builder.vertex(m4f, startX, startY, endZ).color(red, green, blue, alpha).endVertex();
+
+        poseStack.popPose();
+    }
+}