PointKnockback

package com.hypixel.hytale.server.core.modules.interaction.interaction.config.server.combat;

import com.hypixel.hytale.codec.Codec;
import com.hypixel.hytale.codec.KeyedCodec;
import com.hypixel.hytale.codec.builder.BuilderCodec;
import com.hypixel.hytale.math.vector.Vector3d;
import javax.annotation.Nonnull;

public class PointKnockback extends Knockback {
   public static final BuilderCodec<PointKnockback> CODEC = BuilderCodec.builder(PointKnockback.class, PointKnockback::new, Knockback.BASE_CODEC)
      .append(
         new KeyedCodec<>("VelocityY", Codec.DOUBLE),
         (knockbackAttachment, d) -> knockbackAttachment.velocityY = d.floatValue(),
         knockbackAttachment -> (double)knockbackAttachment.velocityY
      )
      .add()
      .append(
         new KeyedCodec<>("RotateY", Codec.INTEGER),
         (knockbackAttachment, i) -> knockbackAttachment.rotateY = i,
         knockbackAttachment -> knockbackAttachment.rotateY
      )
      .add()
      .append(
         new KeyedCodec<>("OffsetX", Codec.INTEGER),
         (knockbackAttachment, i) -> knockbackAttachment.offsetX = i,
         knockbackAttachment -> knockbackAttachment.offsetX
      )
      .add()
      .append(
         new KeyedCodec<>("OffsetZ", Codec.INTEGER),
         (knockbackAttachment, i) -> knockbackAttachment.offsetZ = i,
         knockbackAttachment -> knockbackAttachment.offsetZ
      )
      .add()
      .build();
   protected float velocityY;
   protected int rotateY;
   protected int offsetX;
   protected int offsetZ;

   public PointKnockback() {
   }

   @Nonnull
   @Override
   public Vector3d calculateVector(@Nonnull Vector3d source, float yaw, @Nonnull Vector3d target) {
      Vector3d from = source;
      if (this.offsetX != 0 || this.offsetZ != 0) {
         from = new Vector3d((double)this.offsetX, 0.0, (double)this.offsetZ);
         from.rotateY(yaw * 57.295776F);
         from.add(source);
      }

      Vector3d vector = Vector3d.directionTo(from, target).normalize();
      if (this.rotateY != 0) {
         vector.rotateY((float)this.rotateY);
      }

      double x = vector.getX() * (double)this.force;
      double z = vector.getZ() * (double)this.force;
      double y = (double)this.velocityY;
      return new Vector3d(x, y, z);
   }
}