Свалки у дорог: бочки серые/синие/красные и ящики еды как блоки, лут по детерминированным таблицам, синие на кольце дают продвинутые фрагменты

game-fork/src-overlay/net/rustnotmc/client/net/RsxBlockMap.java

@@ -48,6 +48,23 @@ public final class RsxBlockMap {
                         net.minecraft.item.EnumDyeColor.GRAY);
         STATES[net.rustnotmc.protocol.Blocks.SNOW] =
                 Blocks.SNOW.getDefaultState();
+        // the junk piles of the roads: grey, blue and red barrels, and the
+        // wooden crate of food. A barrel is drawn as a barrel's colour clang
+        // of lantern hardened clay, the crate as a plank blocked square
+        STATES[net.rustnotmc.protocol.Blocks.BARREL] =
+                Blocks.STAINED_HARDENED_CLAY.getDefaultState().withProperty(
+                        net.minecraft.block.BlockColored.COLOR,
+                        net.minecraft.item.EnumDyeColor.SILVER);
+        STATES[net.rustnotmc.protocol.Blocks.BARREL_BLUE] =
+                Blocks.STAINED_HARDENED_CLAY.getDefaultState().withProperty(
+                        net.minecraft.block.BlockColored.COLOR,
+                        net.minecraft.item.EnumDyeColor.BLUE);
+        STATES[net.rustnotmc.protocol.Blocks.BARREL_RED] =
+                Blocks.STAINED_HARDENED_CLAY.getDefaultState().withProperty(
+                        net.minecraft.block.BlockColored.COLOR,
+                        net.minecraft.item.EnumDyeColor.RED);
+        STATES[net.rustnotmc.protocol.Blocks.CRATE] =
+                Blocks.PLANKS.getDefaultState();
     }
 
     private RsxBlockMap() {

rsx-protocol/src/main/java/net/rustnotmc/protocol/Blocks.java

@@ -33,9 +33,17 @@ public final class Blocks {
     /** The surface of the high and cold places. */
     public static final byte SNOW = 9;
 
+    /** A barrel that may be broken for what is in it. */
+    public static final byte BARREL = 10;
+    public static final byte BARREL_BLUE = 11;
+    public static final byte BARREL_RED = 12;
+
+    /** A wooden box of food, standing with the barrels. */
+    public static final byte CRATE = 13;
+
     /** Lowest and highest legal block id. */
     public static final byte MIN = AIR;
-    public static final byte MAX = SNOW;
+    public static final byte MAX = CRATE;
 
     private Blocks() {
     }
@@ -52,6 +60,10 @@ public final class Blocks {
             case LEAVES: return "leaves";
             case ASPHALT: return "asphalt";
             case SNOW: return "snow";
+            case BARREL: return "barrel";
+            case BARREL_BLUE: return "barrel_blue";
+            case BARREL_RED: return "barrel_red";
+            case CRATE: return "crate";
             default: return "unknown(" + id + ")";
         }
     }
@@ -66,6 +78,18 @@ public final class Blocks {
         return id == AIR || id == WATER;
     }
 
+    /**
+     * True when breaking it gives what is inside instead of nothing.
+     *
+     * The barrels and the crates are the loot of the roads: a broken one
+     * empties its content into the hands of whoever broke it, whatever the
+     * game mode says.
+     */
+    public static boolean isLootable(byte id) {
+        return id == BARREL || id == BARREL_BLUE || id == BARREL_RED
+                || id == CRATE;
+    }
+
     public static boolean isValid(byte id) {
         return id >= MIN && id <= MAX;
     }

rsx-protocol/src/main/java/net/rustnotmc/protocol/ItemRegistry.java

@@ -178,8 +178,9 @@ public final class ItemRegistry {
         define(ItemType.of(HIGH_QUALITY_METAL, "High Quality Metal").rid("hqm"));
         define(ItemType.of(SULFUR, "Sulfur Ore").rid("sulfur_ore"));
         define(ItemType.of(SCRAP, "Scrap").rid("scrap"));
-        // The fragments of the blueprints. The remake does not know them: they
-        // come out of the loot crates, and the crates are still to come.
+        // The fragments of the blueprints. They come out of the blue barrels
+        // of the junk piles on the roads, and the advanced ones out of the
+        // barrels on the ring road.
         define(ItemType.of(BASIC_FRAGMENT, "Basic Blueprint Fragment"));
         define(ItemType.of(ADVANCED_FRAGMENT, "Advanced Blueprint Fragment"));
         define(ItemType.of(METAL_PIPE, "Metal Pipe").rid("metalpipe"));

rsx-server-core/scripts/test.ps1

@@ -50,6 +50,7 @@ $suites = @(
     'net.rustnotmc.server.world.WorldTest',
     'net.rustnotmc.server.world.NodeTest',
     'net.rustnotmc.server.world.LodTest',
+    'net.rustnotmc.server.world.PilesTest',
     'net.rustnotmc.server.item.InventoryTest',
     'net.rustnotmc.server.craft.CraftTest',
     'net.rustnotmc.server.hitbox.HitboxTest',

rsx-server-core/src/main/java/net/rustnotmc/server/ClientSession.java

@@ -14,6 +14,7 @@ import net.rustnotmc.protocol.ChunkFormat;
 import net.rustnotmc.protocol.Frame;
 import net.rustnotmc.protocol.FrameDecoder;
 import net.rustnotmc.protocol.ItemRegistry;
+import net.rustnotmc.protocol.ItemStack;
 import net.rustnotmc.protocol.ItemType;
 import net.rustnotmc.protocol.Packet;
 import net.rustnotmc.protocol.Packets;
@@ -797,6 +798,34 @@ public final class ClientSession implements Runnable {
             send(Packets.BREAK_PROGRESS, new Packets.BreakProgress(dig.x, dig.y, dig.z, -1));
             return;
         }
+        byte at;
+        try {
+            at = this.server.world().blockAt(dig.x, dig.y, dig.z);
+        } catch (IOException lost) {
+            at = Blocks.AIR; // the place has no readable ground there
+        }
+        if (Blocks.isLootable(at)) {
+            // a barrel or a crate of the roads gives up what is in it when it
+            // is broken, in the survival mode as well as the creative one
+            if (this.server.world().setBlock(dig.x, dig.y, dig.z, Blocks.AIR)) {
+                this.server.broadcastBlockChange(dig.x, dig.y, dig.z, Blocks.AIR);
+                boolean took = false;
+                for (ItemStack stack : this.server.world().generator()
+                        .pileLoot(at, dig.x, dig.y, dig.z)) {
+                    if (this.player.inventory().add(stack)) {
+                        took = true;
+                    }
+                }
+                if (took) {
+                    this.server.log("pile: " + this.account + " emptied a "
+                            + (at == Blocks.CRATE ? "crate" : "barrel")
+                            + " at " + dig.x + "," + dig.y + "," + dig.z);
+                    send(Packets.INVENTORY, this.player.inventory().toPacket());
+                }
+            }
+            send(Packets.BREAK_PROGRESS, new Packets.BreakProgress(dig.x, dig.y, dig.z, -1));
+            return;
+        }
         if (this.player.mayBreakBlocks()) {
             if (this.server.world().setBlock(dig.x, dig.y, dig.z, Blocks.AIR)) {
                 this.server.broadcastBlockChange(dig.x, dig.y, dig.z, Blocks.AIR);

rsx-server-core/src/main/java/net/rustnotmc/server/world/LodGenerator.java

@@ -156,6 +156,14 @@ public final class LodGenerator {
                 return 0x6E6E6E;
             case Blocks.ASPHALT:
                 return 0x3A3A3A;
+            case Blocks.BARREL:
+                return 0x53514C;
+            case Blocks.BARREL_BLUE:
+                return 0x3D5C85;
+            case Blocks.BARREL_RED:
+                return 0x7B3535;
+            case Blocks.CRATE:
+                return 0x8A7040;
             case Blocks.SNOW:
                 return 0xE9EDEF;
             case Blocks.WATER:

rsx-server-core/src/main/java/net/rustnotmc/server/world/WorldGenerator.java

@@ -2,6 +2,11 @@ package net.rustnotmc.server.world;
 
 import net.rustnotmc.protocol.Blocks;
 import net.rustnotmc.protocol.ChunkFormat;
+import net.rustnotmc.protocol.ItemRegistry;
+import net.rustnotmc.protocol.ItemStack;
+
+import java.util.ArrayList;
+import java.util.List;
 
 /**
  * Turns a seed and a position into terrain.
@@ -58,6 +63,14 @@ public final class WorldGenerator {
     /** How many blocks of canopy a tree may reach. */
     private static final int TREE_REACH = 2;
 
+    /** The salts of the junk piles: usually a point stands empty. */
+    private static final int SALT_SITE = 21;
+    private static final int SALT_COUNT = 22;
+    private static final int SALT_COLOUR = 23;
+    private static final int SALT_CRATE = 24;
+    private static final int SALT_LOOT = 25;
+    private static final int SALT_ITEM = 26;
+
     private final long seed;
     private final int size;
     private final int islandRadius;
@@ -579,10 +592,170 @@ public final class WorldGenerator {
                     }
                 }
             }
+
+            // the junk piles, put up on the roads where they belong
+            layPiles(chunk, blocks, baseX, baseZ);
             chunk.markGenerated();
         }
     }
 
+    /**
+     * Puts the junk piles of the roads into a chunk.
+     *
+     * The heaps stand where the roads meet the network, at every point that
+     * the road keeps free for them: a quarter of those points carries a
+     * heap, and the rest stands empty so the roads do not read as one long
+     * wall of barrels. A heap is a short row of barrels, two to four of them,
+     * and every third row ends with a crate of food.
+     *
+     * Nothing here depends on a random number, the same way the roads
+     * themselves do not: the same world always has the same heaps, so a
+     * broken one stays broken and an untouched one stays untouched when the
+     * chunk is worked out again.
+     */
+    private void layPiles(Chunk chunk, byte[] blocks, int baseX, int baseZ) {
+        ChunkPos pos = chunk.pos();
+        for (int[] point : this.roads.spawnPoints()) {
+            int sx = point[0];
+            int sz = point[1];
+            if (sx < baseX - 6 || sx > baseX + ChunkFormat.WIDTH + 6
+                    || sz < baseZ - 6 || sz > baseZ + ChunkFormat.WIDTH + 6) {
+                continue;
+            }
+            if (!isRoad(sx, sz) || (hash(sx, SALT_SITE, sz) & 0xFFFF) % 3 != 0) {
+                continue; // this point stands empty
+            }
+            int count = 2 + (int) ((hash(sx, SALT_COUNT, sz) & 0xFFFF) % 3);
+            int[] dir = pileDirection(sx, sz);
+            for (int j = 0; j < count; j++) {
+                putPileBlock(blocks, baseX, baseZ,
+                        sx + dir[0] * j, sz + dir[1] * j, barrelOf(sx, sz, j));
+            }
+            if ((hash(sx, SALT_CRATE, sz) & 0xFFFF) % 3 == 0) {
+                putPileBlock(blocks, baseX, baseZ,
+                        sx + dir[0] * count, sz + dir[1] * count, Blocks.CRATE);
+            }
+        }
+    }
+
+    /**
+     * The way a row of barrels runs at a point of the roads.
+     *
+     * Along the road it stands on, so a heap reads as a little side of the
+     * road rather than a wall across it.
+     */
+    private int[] pileDirection(int sx, int sz) {
+        int[] ring = this.roads.onRing(sx, sz);
+        if (ring == null) {
+            // the straight roads run along the axes, so a heap laid along the
+            // axis the road runs in lies along the road
+            if (Math.abs(sz - this.roads.centerLine(sz)) <= RoadNetwork.HALF_WIDTH
+                    && Math.abs(sx - this.roads.centerLine(sx)) > RoadNetwork.HALF_WIDTH) {
+                return new int[]{1, 0};
+            }
+            return new int[]{0, 1};
+        }
+        // the ring: a heap lies along the way the ring goes. The tangent is a
+        // quarter turn from the radius, and it is snapped to the axis it
+        // mostly goes in
+        int rx = ring[0] - this.roads.center();
+        int rz = ring[1] - this.roads.center();
+        int tx = -rz;
+        int tz = rx;
+        if (Math.abs(tx) >= Math.abs(tz)) {
+            return new int[]{Integer.signum(tx), 0};
+        }
+        return new int[]{0, Integer.signum(tz)};
+    }
+
+    /** What one barrel of a heap is, grey or blue or red. */
+    private byte barrelOf(int sx, int sz, int index) {
+        int pick = (int) ((hash(sx, SALT_COLOUR + index, sz) & 0xFFFF) % 100);
+        if (pick < 60) {
+            return Blocks.BARREL;
+        }
+        if (pick < 85) {
+            return Blocks.BARREL_BLUE;
+        }
+        return Blocks.BARREL_RED;
+    }
+
+    /** Lays one barrel of a heap into a chunk that holds its square. */
+    private void putPileBlock(byte[] blocks, int baseX, int baseZ,
+            int px, int pz, byte block) {
+        if (!isRoad(px, pz)) {
+            return; // only a road carries the heaps
+        }
+        int height = heightAt(px, pz);
+        int y = height + 1;
+        if (height < SEA_LEVEL + 1 || y <= 0 || y >= Chunk.HEIGHT - 1) {
+            return;
+        }
+        int x = px - baseX;
+        int z = pz - baseZ;
+        if (x < 0 || x >= ChunkFormat.WIDTH || z < 0 || z >= ChunkFormat.WIDTH) {
+            return; // the barrel belongs to the chunk next door
+        }
+        int index = ChunkFormat.index(x, y, z);
+        if (blocks[index] == Blocks.AIR) {
+            blocks[index] = block;
+        }
+    }
+
+    /**
+     * What comes out of a barrel or a crate of the roads.
+     *
+     * The loot is a pure function of the place as well, so the same barrel
+     * always gives the same content: the looting does not depend on who
+     * counted what when. A grey thing holds scrap with rags, a blue one
+     * parts with a fragment of a blueprint, a red one fuel, and a crate
+     * food and drink. The blue barrels of the ring road sometimes hold the
+     * advanced fragments, the rest of the world gives only the basic ones.
+     */
+    public List<ItemStack> pileLoot(byte block, int x, int y, int z) {
+        List<ItemStack> out = new ArrayList<ItemStack>();
+        long loot = hash(x, y ^ SALT_LOOT, z);
+        long item = hash(x, SALT_ITEM, z ^ y);
+        switch (block) {
+            case Blocks.BARREL: {
+                out.add(ItemStack.of(ItemRegistry.SCRAP,
+                        2 + (int) ((loot & 0xFFFF) % 3)));
+                if ((item & 0xFF) < 64) {
+                    out.add(ItemStack.of(ItemRegistry.BANDANA_MASK
+                            + (int) (((item & 0xFF00) >>> 8) % 16), 1));
+                }
+                break;
+            }
+            case Blocks.BARREL_BLUE: {
+                out.add(ItemStack.of(ItemRegistry.SCRAP,
+                        1 + (int) ((loot & 0xFFFF) % 2)));
+                if ((item & 0xFF) < 115) {
+                    out.add(ItemStack.of(ItemRegistry.BASIC_FRAGMENT, 1));
+                }
+                if (this.roads.onRing(x, z) != null && (item & 0xFF00) < 0x2000) {
+                    out.add(ItemStack.of(ItemRegistry.ADVANCED_FRAGMENT, 1));
+                }
+                break;
+            }
+            case Blocks.BARREL_RED: {
+                out.add(ItemStack.of(ItemRegistry.LOW_GRADE_FUEL,
+                        1 + (int) ((loot & 0xFFFF) % 2)));
+                if ((item & 0xFF) < 102) {
+                    out.add(ItemStack.of(ItemRegistry.CRUDE_OIL, 1));
+                }
+                break;
+            }
+            case Blocks.CRATE: {
+                out.add(ItemStack.of(ItemRegistry.APPLE + (int) ((item & 0xFFFF) % 17),
+                        1 + (int) ((loot & 0xFFFF) % 2)));
+                break;
+            }
+            default:
+                break;
+        }
+        return out;
+    }
+
     /**
      * Lays the wood of one tree into a column of a chunk.
      *

rsx-server-core/src/test/java/net/rustnotmc/server/world/PilesTest.java

@@ -0,0 +1,346 @@
+package net.rustnotmc.server.world;
+
+import java.util.List;
+import net.rustnotmc.protocol.Blocks;
+import net.rustnotmc.protocol.ItemRegistry;
+import net.rustnotmc.protocol.ItemStack;
+
+/**
+ * Tests the junk piles of the roads.
+ *
+ * The heaps are what the roads are for: someone put barrels and crates out
+ * there, and a player on foot breaks one and carries off what it kept. The
+ * heaps have to be on the roads, out of the water, and the same in every
+ * world of the same seed, and the blue ones have to pay in the fragments of
+ * the blueprints the workbenches want.
+ */
+public final class PilesTest {
+
+    private static int checks;
+    private static int failed;
+    private static final java.util.List<String> failures = new java.util.ArrayList<String>();
+
+    public static void main(String[] args) throws Exception {
+        run("the heaps stand on the roads", new Throwing() {
+            public void go() throws Exception { testPlacement(); }
+        });
+        run("a world has the same heaps again", new Throwing() {
+            public void go() throws Exception { testDeterminism(); }
+        });
+        run("no road keeps a barrel over the sea", new Throwing() {
+            public void go() throws Exception { testNoHeapOverTheSea(); }
+        });
+        run("a grey barrel gives scrap and rags", new Throwing() {
+            public void go() throws Exception { testGrey(); }
+        });
+        run("a blue barrel gives the pieces of a blueprint", new Throwing() {
+            public void go() throws Exception { testFragments(); }
+        });
+        run("a red barrel gives fuel", new Throwing() {
+            public void go() throws Exception { testFuel(); }
+        });
+        run("a crate gives food and drink", new Throwing() {
+            public void go() throws Exception { testCrate(); }
+        });
+        run("a walk over the middle of the island meets heaps", new Throwing() {
+            public void go() throws Exception { testRealWorldHeaps(); }
+        });
+
+        System.out.println();
+        for (int i = 0; i < failures.size(); i++) {
+            System.out.println("  FAIL " + failures.get(i));
+        }
+        System.out.println();
+        System.out.println("checks: " + checks + ", failed: " + failed);
+        if (failed != 0) {
+            System.out.println("FAILED");
+            System.exit(1);
+        }
+        System.out.println("OK");
+    }
+
+    private interface Throwing {
+        void go() throws Exception;
+    }
+
+    private static void run(String name, Throwing body) {
+        checks++;
+        int before = failed;
+        try {
+            body.go();
+        } catch (Throwable t) {
+            failed++;
+            failures.add(name + ": threw " + t);
+            t.printStackTrace();
+            return;
+        }
+        if (failed == before) {
+            System.out.println("  ok  " + name);
+        } else {
+            System.out.println("  FAIL " + name);
+        }
+    }
+
+    private static void eq(Object what, Object expected, Object actual) {
+        if (expected == null ? actual != null : !expected.equals(actual)) {
+            failed++;
+            failures.add(what + ": expected " + expected + " but got " + actual);
+        }
+    }
+
+    private static void yes(String what, boolean condition) {
+        if (!condition) {
+            failed++;
+            failures.add(what);
+        }
+    }
+
+    private static Chunk chunkOf(WorldGenerator generator, int cx, int cz) {
+        Chunk chunk = new Chunk(new ChunkPos(cx, cz));
+        generator.generate(chunk);
+        return chunk;
+    }
+
+    /**
+     * Walks the heaps of the chunks around the points the road network keeps
+     * for them, and says every barrel stands where a barrel should: on a
+     * road, on the ground, with nothing in the way over it.
+     */
+    private static void testPlacement() throws Exception {
+        WorldGenerator generator = new WorldGenerator(1234L);
+        RoadNetwork roads = new RoadNetwork(generator.size());
+        int seen = 0;
+        int heaps = 0;
+        java.util.Set<Long> visited = new java.util.HashSet<Long>();
+        for (int[] site : roads.spawnPoints()) {
+            int chunkX = Math.floorDiv(site[0], 16);
+            int chunkZ = Math.floorDiv(site[1], 16);
+            long key = ((long) chunkX << 32) ^ chunkZ;
+            // the same chunk may hold several points, and generation costs
+            // real seconds
+            if (!visited.add(key)) {
+                continue;
+            }
+            Chunk chunk = chunkOf(generator, chunkX, chunkZ);
+            boolean heap = false;
+            for (int y = 0; y < Chunk.HEIGHT; y++) {
+                for (int z = 0; z < Chunk.WIDTH; z++) {
+                    for (int x = 0; x < Chunk.WIDTH; x++) {
+                        byte id = chunk.block(x, y, z);
+                        if (!Blocks.isLootable(id)) {
+                            continue;
+                        }
+                        heap = true;
+                        seen++;
+                        int worldX = chunkX * 16 + x;
+                        int worldZ = chunkZ * 16 + z;
+                        yes("a barrel on the road at " + worldX + "," + worldZ,
+                                generator.isRoad(worldX, worldZ));
+                        eq("the ground under the barrel at " + worldX
+                                        + "," + worldZ,
+                                Integer.valueOf(y - 1),
+                                Integer.valueOf(generator.heightAt(worldX, worldZ)));
+                        eq("nothing wedged over the barrel at " + worldX
+                                        + "," + worldZ,
+                                Byte.valueOf(Blocks.AIR),
+                                Byte.valueOf(chunk.block(x, y + 1, z)));
+                    }
+                }
+            }
+            if (heap) {
+                heaps++;
+            }
+        }
+        yes("the roads carry heaps (" + seen + " barrels seen)", seen > 0);
+        yes("more heaps of one (" + heaps + " chunks with a heap)",
+                heaps > 3);
+    }
+
+    private static void testDeterminism() throws Exception {
+        Chunk one = chunkOf(new WorldGenerator(1234L), 0, 0);
+        Chunk two = chunkOf(new WorldGenerator(1234L), 0, 0);
+        yes("same seed, same chunk, barrels and all",
+                java.util.Arrays.equals(one.raw(), two.raw()));
+    }
+
+    /** No barrel stands where the sea is, whatever the network plans. */
+    private static void testNoHeapOverTheSea() throws Exception {
+        WorldGenerator generator = new WorldGenerator(1234L);
+        RoadNetwork roads = new RoadNetwork(generator.size());
+        for (int[] point : roads.spawnPoints()) {
+            if (!generator.isRoad(point[0], point[1])) {
+                continue; // the network does not keep a road here
+            }
+            yes("the road at " + point[0] + "," + point[1] + " is dry",
+                    generator.heightAt(point[0], point[1]) >= WorldGenerator.SEA_LEVEL + 1);
+        }
+    }
+
+    /** One broken barrel: what comes out of it puts a player on their way. */
+    private static void greyLoot(WorldGenerator generator, int x, int y, int z) {
+        List<ItemStack> loot = generator.pileLoot(Blocks.BARREL, x, y, z);
+        yes("a grey barrel gives something", !loot.isEmpty());
+        int scrap = 0;
+        int others = 0;
+        for (ItemStack stack : loot) {
+            if (stack.item == ItemRegistry.SCRAP) {
+                scrap = stack.count;
+            } else {
+                others++;
+                yes("the rags of a heap are worn things (" + stack.item + ")",
+                        stack.item >= ItemRegistry.BANDANA_MASK
+                                && stack.item <= ItemRegistry.ROADSIGN_GLOVES);
+                eq("a rag is one", Integer.valueOf(1),
+                        Integer.valueOf(stack.count));
+            }
+        }
+        eq("a grey barrel keeps at most two stacks", Integer.valueOf(1),
+                Integer.valueOf(loot.size() <= 2 ? 1 : 0));
+        yes("the scrap is " + scrap + ", between two and four",
+                scrap >= 2 && scrap <= 4);
+        yes("at most one rag with the scrap", others <= 1);
+    }
+
+    private static void testGrey() throws Exception {
+        WorldGenerator generator = new WorldGenerator(1234L);
+        int rags = 0;
+        for (int w = 0; w < 120; w++) {
+            List<ItemStack> loot = generator.pileLoot(Blocks.BARREL,
+                    w * 37, 70, -w * 11);
+            for (ItemStack stack : loot) {
+                if (stack.item != ItemRegistry.SCRAP) {
+                    rags++;
+                }
+            }
+            greyLoot(generator, w * 37, 70, -w * 11);
+        }
+        yes("now and then a rag rides with the scrap (" + rags + ")",
+                rags > 0 && rags < 60);
+    }
+
+    /** The blue barrels pay in the fragments of the blueprints. */
+    private static void testFragments() throws Exception {
+        WorldGenerator generator = new WorldGenerator(1234L);
+        RoadNetwork roads = new RoadNetwork(generator.size());
+        int radius = roads.ringRadius();
+        int basic = 0;
+        int advanced = 0;
+        int offRing = 0;
+        // the straight roads of the grid, all the way out, and the ring road
+        // itself: the advanced fragments only belong to the ring
+        for (int w = 0; w < 800; w++) {
+            int x = w * 7 - 2800;
+            int z = (w * 13) % 2200;
+            List<ItemStack> loot = generator.pileLoot(Blocks.BARREL_BLUE, x, 70, z);
+            for (ItemStack stack : loot) {
+                if (stack.item == ItemRegistry.BASIC_FRAGMENT) {
+                    basic++;
+                }
+                if (stack.item == ItemRegistry.ADVANCED_FRAGMENT) {
+                    advanced++;
+                    if (roads.onRing(x, z) == null) {
+                        offRing++;
+                    }
+                }
+            }
+            for (ItemStack stack : generator.pileLoot(Blocks.BARREL_BLUE, x, 70, -z)) {
+                if (stack.item == ItemRegistry.BASIC_FRAGMENT) {
+                    basic++;
+                }
+            }
+        }
+        for (int i = 0; i < 720; i++) {
+            double angle = 2.0D * Math.PI * i / 720;
+            int x = (int) Math.round(Math.cos(angle) * radius);
+            int z = (int) Math.round(Math.sin(angle) * radius);
+            for (ItemStack stack : generator.pileLoot(Blocks.BARREL_BLUE, x, 70, z)) {
+                if (stack.item == ItemRegistry.ADVANCED_FRAGMENT) {
+                    advanced++;
+                }
+            }
+        }
+        yes("the blue barrels give the basic fragments (" + basic + ")",
+                basic > 200);
+        yes("the advanced fragments come out now and then (" + advanced + ")",
+                advanced > 0);
+        eq("none of them off the ring", Integer.valueOf(0),
+                Integer.valueOf(offRing));
+    }
+
+    /** The red barrels give fuel, the crude oil with it. */
+    private static void testFuel() throws Exception {
+        WorldGenerator generator = new WorldGenerator(1234L);
+        boolean fuel = false;
+        int oils = 0;
+        for (int w = 0; w < 120; w++) {
+            List<ItemStack> loot = generator.pileLoot(Blocks.BARREL_RED,
+                    -w * 19, 70, w * 29);
+            yes("a red barrel gives something", !loot.isEmpty());
+            for (ItemStack stack : loot) {
+                if (stack.item == ItemRegistry.LOW_GRADE_FUEL) {
+                    fuel = true;
+                    yes("the fuel is " + stack.count + ", one or two",
+                            stack.count >= 1 && stack.count <= 2);
+                }
+                if (stack.item == ItemRegistry.CRUDE_OIL) {
+                    oils++;
+                    eq("a jug of oil is one", Integer.valueOf(1),
+                            Integer.valueOf(stack.count));
+                }
+            }
+            yes("a red barrel keeps at most two stacks at " + w,
+                    loot.size() <= 2);
+        }
+        yes("the red barrels give fuel", fuel);
+        yes("some of them give crude oil (" + oils + ")",
+                oils > 0 && oils < 60);
+    }
+
+    /** A crate feeds a player: the thing inside is something to eat. */
+    private static void testCrate() throws Exception {
+        WorldGenerator generator = new WorldGenerator(1234L);
+        int foods = 0;
+        boolean drink = false;
+        for (int w = 0; w < 170; w++) {
+            List<ItemStack> loot = generator.pileLoot(Blocks.CRATE,
+                    w * 23, 70, -w * 31);
+            eq("a crate gives one stack", Integer.valueOf(1),
+                    Integer.valueOf(loot.size()));
+            int item = loot.get(0).item;
+            yes("a crate keeps food or drink (" + item + ")",
+                    item >= ItemRegistry.APPLE && item <= ItemRegistry.MUSHROOM);
+            foods++;
+            if (item >= ItemRegistry.SMALL_WATER_BOTTLE
+                    && item <= ItemRegistry.WATER_JUG) {
+                drink = true;
+            }
+        }
+        yes("the crates are counted (" + foods + ")", foods > 0);
+        yes("now and then a crate keeps drink", drink);
+    }
+
+    /**
+     * The heaps a player meets on an actual walk: the chunks over the middle
+     * of the island carry roads, the roads carry heaps, and a heap carries
+     * barrels in a row of two to four.
+     */
+    private static void testRealWorldHeaps() throws Exception {
+        int heaps = 0;
+        for (int cx = -2; cx <= 2; cx++) {
+            for (int cz = -2; cz <= 2; cz++) {
+                Chunk chunk = chunkOf(new WorldGenerator(1234L), cx, cz);
+                for (int y = 0; y < Chunk.HEIGHT; y++) {
+                    for (int z = 0; z < Chunk.WIDTH; z++) {
+                        for (int x = 0; x < Chunk.WIDTH; x++) {
+                            if (Blocks.isLootable(chunk.block(x, y, z))) {
+                                heaps++;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        yes("the roads about the middle carry heaps (" + heaps + " barrels)",
+                heaps >= 2);
+    }
+}