Add markers to indicate where the ball landed

src/main/java/io/github/haykam821/volleyball/game/ball/ActiveBallState.java

@@ -31,13 +31,13 @@ public void onTick() {
 		if (this.onEntityTick()) return;
 
 		if (this.ticksSinceHit >= this.phase.getConfig().getInactiveBallTicks()) {
-			this.phase.resetBall();
+			this.phase.resetBall(null);
 			this.phase.getGameSpace().getPlayers().sendMessage(INACTIVE_BALL_RESET_MESSAGE);
 		} else {
 			this.ticksSinceHit += 1;
 
 			if (this.possessionTeam != null && this.phase.hasBallLandedOffCourt(this.ball)) {
-				this.possessionTeam.getOtherTeam().incrementScore();
+				this.possessionTeam.incrementOtherTeamScore();
 			}
 		}
 	}

src/main/java/io/github/haykam821/volleyball/game/ball/BallState.java

@@ -2,9 +2,12 @@
 
 import java.util.Objects;
 
+import eu.pb4.polymer.virtualentity.api.attachment.HolderAttachment;
 import io.github.haykam821.volleyball.game.phase.VolleyballActivePhase;
 import io.github.haykam821.volleyball.game.player.PlayerEntry;
+import io.github.haykam821.volleyball.game.player.team.TeamEntry;
 import net.minecraft.entity.Entity;
+import net.minecraft.server.world.ServerWorld;
 
 public abstract class BallState {
 	protected final VolleyballActivePhase phase;
@@ -22,4 +25,8 @@ public boolean onAttackEntity(PlayerEntry entry, Entity entity) {
 	public void destroy(BallState newState) {
 		return;
 	}
+
+	public HolderAttachment createMarker(TeamEntry team, ServerWorld world) {
+		return null;
+	}
 }

src/main/java/io/github/haykam821/volleyball/game/ball/EntityBallState.java

@@ -2,12 +2,30 @@
 
 import java.util.Objects;
 
+import org.joml.Matrix4f;
+
+import eu.pb4.polymer.virtualentity.api.ElementHolder;
+import eu.pb4.polymer.virtualentity.api.attachment.ChunkAttachment;
+import eu.pb4.polymer.virtualentity.api.attachment.HolderAttachment;
+import eu.pb4.polymer.virtualentity.api.elements.TextDisplayElement;
 import io.github.haykam821.volleyball.game.phase.VolleyballActivePhase;
 import io.github.haykam821.volleyball.game.player.PlayerEntry;
 import io.github.haykam821.volleyball.game.player.team.TeamEntry;
 import net.minecraft.entity.Entity;
+import net.minecraft.entity.decoration.DisplayEntity.BillboardMode;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.text.Text;
+import net.minecraft.util.Formatting;
+import net.minecraft.util.math.MathHelper;
 
 public abstract class EntityBallState extends BallState {
+	private static final Text MARKER_TEXT = Text.literal("❌").formatted(Formatting.BOLD);
+
+	private static final Matrix4f MARKER_TRANSFORMATION = new Matrix4f()
+		.translate(-1 / 32f, 0, 21 / 64f)
+		.rotateX(MathHelper.PI / -2)
+		.scale(2);
+
 	protected final Entity ball;
 
 	public EntityBallState(VolleyballActivePhase phase, Entity ball) {
@@ -21,13 +39,13 @@ public EntityBallState(VolleyballActivePhase phase, Entity ball) {
 	 */
 	protected final boolean onEntityTick() {
 		if (!this.ball.isAlive()) {
-			this.phase.resetBall();
+			this.phase.resetBall(null);
 			return true;
 		}
 
 		for (TeamEntry team : this.phase.getTeams()) {
 			if (team.isBallOnCourt(this.ball)) {
-				team.getOtherTeam().incrementScore();
+				team.incrementOtherTeamScore();
 				return true;
 			}
 		}
@@ -53,4 +71,23 @@ public final void destroy(BallState newState) {
 			this.ball.discard();
 		}
 	}
+
+	@Override
+	public HolderAttachment createMarker(TeamEntry team, ServerWorld world) {
+		Text text = MARKER_TEXT.copy().formatted(team.getFormatting());
+		TextDisplayElement element = new TextDisplayElement(text);
+
+		element.setShadow(true);
+		element.setBackground(0);
+
+		element.setInvisible(true);
+
+		element.setTransformation(MARKER_TRANSFORMATION);
+		element.setBillboardMode(BillboardMode.VERTICAL);
+
+		ElementHolder holder = new ElementHolder();
+		holder.addElement(element);
+
+		return ChunkAttachment.of(holder, world, this.ball.getPos());
+	}
 }

src/main/java/io/github/haykam821/volleyball/game/ball/InactiveBallState.java

@@ -1,13 +1,17 @@
 package io.github.haykam821.volleyball.game.ball;
 
+import eu.pb4.polymer.virtualentity.api.attachment.HolderAttachment;
 import io.github.haykam821.volleyball.game.phase.VolleyballActivePhase;
 
 public class InactiveBallState extends BallState {
+	private final HolderAttachment markerAttachment;
+
 	private int ticksUntilSpawn;
 
-	public InactiveBallState(VolleyballActivePhase phase) {
+	public InactiveBallState(VolleyballActivePhase phase, HolderAttachment markerAttachment) {
 		super(phase);
 
+		this.markerAttachment = markerAttachment;
 		this.ticksUntilSpawn = phase.getConfig().getResetBallTicks();
 	}
 
@@ -19,4 +23,12 @@ public void onTick() {
 			this.phase.spawnBall();
 		}
 	}
+
+	@Override
+	public void destroy(BallState newState) {
+		if (this.markerAttachment != null) {
+			this.markerAttachment.holder().destroy();
+			this.markerAttachment.destroy();
+		}
+	}
 }

src/main/java/io/github/haykam821/volleyball/game/phase/VolleyballActivePhase.java

@@ -5,6 +5,7 @@
 import java.util.Map;
 import java.util.Set;
 
+import eu.pb4.polymer.virtualentity.api.attachment.HolderAttachment;
 import io.github.haykam821.volleyball.game.VolleyballConfig;
 import io.github.haykam821.volleyball.game.ball.BallState;
 import io.github.haykam821.volleyball.game.ball.InactiveBallState;
@@ -250,8 +251,9 @@ public void spawnBall() {
 	/**
 	 * Resets the ball, transitioning it into the ready state.
 	 */
-	public void resetBall() {
-		this.setBallState(new InactiveBallState(this));
+	public void resetBall(TeamEntry markerTeam) {
+		HolderAttachment markerAttachment = markerTeam == null ? null : this.ballState.createMarker(markerTeam, this.world);
+		this.setBallState(new InactiveBallState(this, markerAttachment));
 	}
 
 	public void setBallState(BallState ballState) {

src/main/java/io/github/haykam821/volleyball/game/player/team/TeamEntry.java

@@ -62,11 +62,15 @@ public boolean isBallOnCourt(Entity ball) {
 		return ball.isOnGround() || ball.getY() < this.courtBox.minY;
 	}
 
-	public void incrementScore() {
+	public void incrementOtherTeamScore() {
+		this.getOtherTeam().incrementScore(this);
+	}
+
+	private void incrementScore(TeamEntry causer) {
 		this.phase.getGameSpace().getPlayers().sendMessage(this.getScoreText());
 		this.phase.pling();
 
-		this.phase.resetBall();
+		this.phase.resetBall(causer);
 
 		this.score += 1;
 		this.phase.getScoreboard().update();
@@ -88,6 +92,10 @@ public Text getScoreboardEntryText() {
 		return Text.translatable("text.volleyball.scoreboard.entry", this.getName(), this.score);
 	}
 
+	public Formatting getFormatting() {
+		return this.config.chatFormatting();
+	}
+
 	public Text getName() {
 		return this.config.name();
 	}
@@ -101,7 +109,7 @@ private TemplateRegion getRegion(MapTemplate template, String key) {
 		return template.getMetadata().getFirstRegion(this.key.id() + "_" + key);
 	}
 
-	public TeamEntry getOtherTeam() {
+	private TeamEntry getOtherTeam() {
 		for (TeamEntry team : this.phase.getTeams()) {
 			if (this != team) return team;
 		}