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Fix block placement below players (#767)

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iam 2022-03-14 14:07:29 -04:00 committed by GitHub
parent acee29c20a
commit bcfb4c6ea4
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 88 additions and 24 deletions
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38
src/main/java/net/minestom/server/collision/BlockCollision.java
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@ -3,11 +3,17 @@ package net.minestom.server.collision;
import net.minestom.server.coordinate.Point;
import net.minestom.server.coordinate.Pos;
import net.minestom.server.coordinate.Vec;
import net.minestom.server.entity.Entity;
import net.minestom.server.entity.EntityType;
import net.minestom.server.entity.metadata.other.ArmorStandMeta;
import net.minestom.server.instance.Instance;
import net.minestom.server.instance.block.Block;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
final class BlockCollision {
import java.util.Collection;
public final class BlockCollision {
// Minimum move amount, minimum final velocity
private static final double MIN_DELTA = 0.001;
@ -325,6 +331,36 @@ final class BlockCollision {
Vec.ZERO, finalResult.collidedShapePosition, finalResult.blockType);
}
static boolean canPlaceBlockAt(Instance instance, Point blockPos, Block b) {
final Collection<Entity> entities = instance.getNearbyEntities(blockPos, 3);
return entities
.stream()
.filter(entity -> entity.getEntityType() != EntityType.ITEM)
.filter(entity -> {
// Marker Armor Stands should not prevent block placement
if (entity.getEntityMeta() instanceof ArmorStandMeta armorStandMeta) {
return !armorStandMeta.isMarker();
}
return true;
})
.noneMatch(entity -> {
boolean intersects;
if (entity.getEntityType() == EntityType.PLAYER) {
// Need to move player slightly away from block we're placing.
// If player is at block 40 we cannot place a block at block 39 with side length 1 because the block will be in [39, 40]
// For this reason we subtract a small amount from the player position
Point playerPos = entity.getPosition().add(entity.getPosition().sub(blockPos).mul(0.01));
intersects = b.registry().collisionShape().intersectBox(playerPos.sub(blockPos), entity.getBoundingBox());
} else {
intersects = b.registry().collisionShape().intersectBox(entity.getPosition().sub(blockPos), entity.getBoundingBox());
}
return intersects;
});
}
/**
* Check if a moving entity will collide with a block. Updates finalResult
*

5
src/main/java/net/minestom/server/collision/CollisionUtils.java
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@ -1,5 +1,6 @@
package net.minestom.server.collision;
import net.minestom.server.coordinate.Point;
import net.minestom.server.coordinate.Pos;
import net.minestom.server.coordinate.Vec;
import net.minestom.server.entity.Entity;
@ -41,6 +42,10 @@ public final class CollisionUtils {
return handlePhysics(entity, entityVelocity, null);
}
public static boolean canPlaceBlockAt(Instance instance, Point blockPos, Block b) {
return BlockCollision.canPlaceBlockAt(instance, blockPos, b);
}
/**
* Applies world border collision.
*

25
src/main/java/net/minestom/server/listener/BlockPlacementListener.java
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@ -1,12 +1,10 @@
package net.minestom.server.listener;
import net.minestom.server.MinecraftServer;
import net.minestom.server.collision.CollisionUtils;
import net.minestom.server.coordinate.Point;
import net.minestom.server.entity.Entity;
import net.minestom.server.entity.EntityType;
import net.minestom.server.entity.GameMode;
import net.minestom.server.entity.Player;
import net.minestom.server.entity.metadata.other.ArmorStandMeta;
import net.minestom.server.event.EventDispatcher;
import net.minestom.server.event.player.PlayerBlockInteractEvent;
import net.minestom.server.event.player.PlayerBlockPlaceEvent;
@ -26,8 +24,6 @@ import net.minestom.server.network.packet.server.play.BlockChangePacket;
import net.minestom.server.utils.chunk.ChunkUtils;
import net.minestom.server.utils.validate.Check;
import java.util.Collection;
public class BlockPlacementListener {
private static final BlockManager BLOCK_MANAGER = MinecraftServer.getBlockManager();
@ -109,24 +105,7 @@ public class BlockPlacementListener {
}
final Block placedBlock = useMaterial.block();
final Collection<Entity> entities = instance.getNearbyEntities(placementPosition, 5);
// Check if the player is trying to place a block in an entity
boolean intersectPlayer = placedBlock.registry().collisionShape().intersectBox(player.getPosition().sub(placementPosition), player.getBoundingBox());
boolean hasIntersect = intersectPlayer || entities
.stream()
.filter(entity -> entity.getEntityType() != EntityType.ITEM)
.filter(entity -> {
// Marker Armor Stands should not prevent block placement
if (entity.getEntityMeta() instanceof ArmorStandMeta armorStandMeta) {
return !armorStandMeta.isMarker();
}
return true;
})
.anyMatch(entity -> placedBlock.registry().collisionShape().intersectBox(entity.getPosition().sub(placementPosition), entity.getBoundingBox()));
if (hasIntersect) {
if (!CollisionUtils.canPlaceBlockAt(instance, placementPosition, placedBlock)) {
refresh(player, chunk);
return;
}

44
src/test/java/net/minestom/server/collision/PlacementCollisionIntegrationTest.java Normal file
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@ -0,0 +1,44 @@
package net.minestom.server.collision;
import net.minestom.server.api.Env;
import net.minestom.server.api.EnvTest;
import net.minestom.server.coordinate.Pos;
import net.minestom.server.coordinate.Vec;
import net.minestom.server.entity.Entity;
import net.minestom.server.entity.EntityType;
import net.minestom.server.instance.block.Block;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
@EnvTest
public class PlacementCollisionIntegrationTest {
@Test
public void empty(Env env) {
var instance = env.createFlatInstance();
assertTrue(BlockCollision.canPlaceBlockAt(instance, new Vec(0, 40, 0), Block.STONE));
}
@Test
public void entityBlock(Env env) {
var instance = env.createFlatInstance();
new Entity(EntityType.ZOMBIE).setInstance(instance, new Pos(0, 40, 0)).join();
assertFalse(BlockCollision.canPlaceBlockAt(instance, new Vec(0, 40, 0), Block.STONE));
}
@Test
public void slab(Env env) {
var instance = env.createFlatInstance();
new Entity(EntityType.ZOMBIE).setInstance(instance, new Pos(0, 40.75, 0)).join();
assertTrue(BlockCollision.canPlaceBlockAt(instance, new Vec(0, 40, 0), Block.STONE_SLAB));
}
@Test
public void belowPlayer(Env env) {
var instance = env.createFlatInstance();
env.createPlayer(instance, new Pos(5.7, -8, 6.389));
assertTrue(BlockCollision.canPlaceBlockAt(instance, new Vec(5, -9, 6), Block.STONE));
}
}