Marks a selected area in minecraft using the Paper API

BlockSelection.java

package me.delta.mc.wand.main;

import org.bukkit.Color;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.block.Block;
import org.bukkit.entity.BlockDisplay;
import org.bukkit.entity.Display;
import org.bukkit.util.BlockVector;
import org.bukkit.util.BoundingBox;
import org.bukkit.util.Transformation;
import org.joml.AxisAngle4f;
import org.joml.Vector3f;

import java.util.HashSet;
import java.util.Set;

public class BlockSelection {

    private final World world;
    private final BoundingBox box;
    private final Color color;
    private final Material material;

    private Set<BlockDisplay> selection = new HashSet<>(6);
   
    //Recommended Material: Stained Glass
    public BlockSelection(World world, Block corner1, Block corner2, Color color, Material material) {
        this.box = BoundingBox.of(corner1, corner2).expand(0.01);
        this.world = world;
        this.color = color;
        this.material = material;

    }

    public BlockSelection createSelection() {

        Location loc1 = new BlockVector(this.box.getMin()).toLocation(this.world);
        Location loc2 = new BlockVector(this.box.getMax()).toLocation(this.world);

        this.spawnDisplay(new Transformation(new Vector3f(), new AxisAngle4f(), new Vector3f((float) this.box.getWidthX(), (float) this.box.getHeight(), 0), new AxisAngle4f()), loc1);
        this.spawnDisplay(new Transformation(new Vector3f(), new AxisAngle4f(), new Vector3f(0, (float) this.box.getHeight(), (float) this.box.getWidthZ()), new AxisAngle4f()), loc1);
        this.spawnDisplay(new Transformation(new Vector3f(), new AxisAngle4f(), new Vector3f((float) this.box.getWidthX(), 0, (float) this.box.getWidthZ()), new AxisAngle4f()), loc1);

        this.spawnDisplay(new Transformation(new Vector3f(), new AxisAngle4f(), new Vector3f((float) -this.box.getWidthX(), (float) -this.box.getHeight(), 0), new AxisAngle4f()), loc2);
        this.spawnDisplay(new Transformation(new Vector3f(), new AxisAngle4f(), new Vector3f(0, (float) -this.box.getHeight(), (float) -this.box.getWidthZ()), new AxisAngle4f()), loc2);
        this.spawnDisplay(new Transformation(new Vector3f(), new AxisAngle4f(), new Vector3f((float) -this.box.getWidthX(), 0, (float) -this.box.getWidthZ()), new AxisAngle4f()), loc2);

        return this;
    }

    private BlockDisplay spawnDisplay(Transformation transformation, Location location) {

        return this.world.spawn(location, BlockDisplay.class, blockDisplay -> {
            blockDisplay.setBlock(this.material.createBlockData());
            blockDisplay.setGravity(false);
            blockDisplay.setInvulnerable(true);
            blockDisplay.setGlowing(true);
            blockDisplay.setPersistent(true);
            blockDisplay.setTransformation(transformation);
            blockDisplay.setBrightness(new Display.Brightness(15, 15));
            blockDisplay.setShadowStrength(0);
            blockDisplay.setShadowRadius(0);
            blockDisplay.setGlowColorOverride(this.color);
            this.selection.add(blockDisplay);
        });
    }


    public void deselect() {
        if (this.selection == null) return;
        this.selection.forEach(blockDisplay -> blockDisplay.remove());
        this.selection = null;
    }
}