CoordinateRotator.java

package com.hypixel.hytale.procedurallib.random;

import com.hypixel.hytale.math.util.TrigMathUtil;
import javax.annotation.Nonnull;

public class CoordinateRotator implements ICoordinateRandomizer {
   public static final CoordinateRotator NONE = new CoordinateRotator(0.0, 0.0);
   public static final int X0 = 0;
   public static final int Y0 = 1;
   public static final int Z0 = 2;
   public static final int X1 = 3;
   public static final int Y1 = 4;
   public static final int Z1 = 5;
   public static final int X2 = 6;
   public static final int Y2 = 7;
   public static final int Z2 = 8;
   protected final double pitch;
   protected final double yaw;
   @Nonnull
   protected final double[] matrix;

   public CoordinateRotator(double pitch, double yaw) {
      this.pitch = pitch;
      this.yaw = yaw;
      this.matrix = createRotationMatrix(pitch, yaw);
   }

   public double rotateX(double x, double y) {
      return x * this.matrix[0] + y * this.matrix[2];
   }

   public double rotateY(double x, double y) {
      return x * this.matrix[6] + y * this.matrix[8];
   }

   public double rotateX(double x, double y, double z) {
      return x * this.matrix[0] + y * this.matrix[1] + z * this.matrix[2];
   }

   public double rotateY(double x, double y, double z) {
      return x * this.matrix[3] + y * this.matrix[4] + z * this.matrix[5];
   }

   public double rotateZ(double x, double y, double z) {
      return x * this.matrix[6] + y * this.matrix[7] + z * this.matrix[8];
   }

   public double randomDoubleX(int seed, double x, double y) {
      return this.rotateX(x, y);
   }

   public double randomDoubleY(int seed, double x, double y) {
      return this.rotateY(x, y);
   }

   public double randomDoubleX(int seed, double x, double y, double z) {
      return this.rotateX(x, y, z);
   }

   public double randomDoubleY(int seed, double x, double y, double z) {
      return this.rotateY(x, y, z);
   }

   public double randomDoubleZ(int seed, double x, double y, double z) {
      return this.rotateZ(x, y, z);
   }

   @Nonnull
   public String toString() {
      return "CoordinateRotator{pitch=" + this.pitch + ", yaw=" + this.yaw + "}";
   }

   public static double[] createRotationMatrix(double pitch, double yaw) {
      double sinYaw = (double)TrigMathUtil.sin(yaw);
      double cosYaw = (double)TrigMathUtil.cos(yaw);
      double sinPitch = (double)TrigMathUtil.sin(pitch);
      double cosPitch = (double)TrigMathUtil.cos(pitch);
      double px1 = 1.0;
      double px2 = 0.0;
      double px3 = 0.0;
      double py1 = 0.0;
      double py3 = -sinPitch;
      double pz1 = 0.0;
      double yx2 = 0.0;
      double yy1 = 0.0;
      double yy2 = 1.0;
      double yy3 = 0.0;
      double yz1 = -sinYaw;
      double yz2 = 0.0;
      return new double[]{dot(px1, px2, px3, cosYaw, yy1, yz1), dot(px1, px2, px3, yx2, yy2, yz2), dot(px1, px2, px3, sinYaw, yy3, cosYaw), dot(py1, cosPitch, py3, cosYaw, yy1, yz1), dot(py1, cosPitch, py3, yx2, yy2, yz2), dot(py1, cosPitch, py3, sinYaw, yy3, cosYaw), dot(pz1, sinPitch, cosPitch, cosYaw, yy1, yz1), dot(pz1, sinPitch, cosPitch, yx2, yy2, yz2), dot(pz1, sinPitch, cosPitch, sinYaw, yy3, cosYaw)};
   }

   private static double dot(double x1, double y1, double z1, double x2, double y2, double z2) {
      return x1 * x2 + y1 * y2 + z1 * z2;
   }
}