MathUtils.h Example File

 // -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-
 #ifndef __ZXING_COMMON_DETECTOR_MATHUTILS_H__
 #define __ZXING_COMMON_DETECTOR_MATHUTILS_H__
 /*
  *  Copyright 2012 ZXing authors All rights reserved.
  *
  * 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.
  */

 #include <cmath>

 namespace zxing {
 namespace common {
 namespace detector {

 class MathUtils {
  private:
   MathUtils();
   ~MathUtils();
  public:

   /**
    * 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.
    */
   static inline int round(float d) {
     return (int) (d + 0.5f);
   }

   static inline float distance(float aX, float aY, float bX, float bY) {
     float xDiff = aX - bX;
     float yDiff = aY - bY;
     return sqrt(xDiff * xDiff + yDiff * yDiff);
   }

   static inline float distance(int aX, int aY, int bX, int bY) {
     int xDiff = aX - bX;
     int yDiff = aY - bY;
     return sqrt(float(xDiff * xDiff + yDiff * yDiff));
   }
 };

 }
 }
 }

 #endif