content: /*
   * Copyright 2012 ZXing authors
   *
   * 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 com.ailiwean.core.zxing.core.common.detector;
  
  /**
   * General math-related and numeric utility functions.
   */
  public final class MathUtils {
  
    private MathUtils() {
    }
  
    /**
     * Ends up being a bit faster than {@link Math#round(float)}. This merely rounds its
     * argument to the nearest int, where x.5 rounds up to x+1. Semantics of this shortcut
     * differ slightly from {@link Math#round(float)} in that half rounds down for negative
     * values. -2.5 rounds to -3, not -2. For purposes here it makes no difference.
     *
     * @param d real value to round
     * @return nearest {@code int}
     */
    public static int round(float d) {
      return (int) (d + (d < 0.0f ? -0.5f : 0.5f));
    }
  
    /**
     * @param aX point A x coordinate
     * @param aY point A y coordinate
     * @param bX point B x coordinate
     * @param bY point B y coordinate
     * @return Euclidean distance between points A and B
     */
    public static float distance(float aX, float aY, float bX, float bY) {
      double xDiff = aX - bX;
      double yDiff = aY - bY;
      return (float) Math.sqrt(xDiff * xDiff + yDiff * yDiff);
    }
  
    /**
     * @param aX point A x coordinate
     * @param aY point A y coordinate
     * @param bX point B x coordinate
     * @param bY point B y coordinate
     * @return Euclidean distance between points A and B
     */
    public static float distance(int aX, int aY, int bX, int bY) {
      double xDiff = aX - bX;
      double yDiff = aY - bY;
      return (float) Math.sqrt(xDiff * xDiff + yDiff * yDiff);
    }
  
    /**
     * @param array values to sum
     * @return sum of values in array
     */
    public static int sum(int[] array) {
      int count = 0;
      for (int a : array) {
        count += a;
      }
      return count;
    }
  
  }
  