content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package androidx.constraintLayout.desktop.constraintRendering.layout3d;
  
  /**
   * Basic vector math
   */
  public class VectorUtil {
    public static void sub(double[] a, double[] b, double[] out) {
      out[0] = a[0] - b[0];
      out[1] = a[1] - b[1];
      out[2] = a[2] - b[2];
    }
  
    public static void mult(double[] a, double b, double[] out) {
      out[0] = a[0] * b;
      out[1] = a[1] * b;
      out[2] = a[2] * b;
    }
  
    public static double dot(double[] a, double[] b) {
      return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
    }
  
    public static double norm(double[] a) {
      return Math.sqrt(a[0] * a[0] + a[1] * a[1] + a[2] * a[2]);
    }
  
    public static void cross(double[] a, double[] b, double[] out) {
      double out0 = a[1] * b[2] - b[1] * a[2];
      double out1 = a[2] * b[0] - b[2] * a[0];
      double out2 = a[0] * b[1] - b[0] * a[1];
      out[0] = out0;
      out[1] = out1;
      out[2] = out2;
    }
  
    public static void normalize(double[] a) {
      double norm = norm(a);
      a[0] /= norm;
      a[1] /= norm;
      a[2] /= norm;
    }
  
    public static void add(double[] a, double[] b,
                           double[] out) {
      out[0] = a[0] + b[0];
      out[1] = a[1] + b[1];
      out[2] = a[2] + b[2];
    }
  }
  