Detector.h Example File

 // -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-
 #ifndef __DETECTOR_H__
 #define __DETECTOR_H__

 /*
  *  Detector.h
  *  zxing
  *
  *  Created by Luiz Silva on 09/02/2010.
  *  Copyright 2010 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 <zxing/common/Counted.h>
 #include <zxing/common/DetectorResult.h>
 #include <zxing/common/BitMatrix.h>
 #include <zxing/common/PerspectiveTransform.h>
 #include <zxing/common/detector/WhiteRectangleDetector.h>

 namespace zxing {
 namespace datamatrix {

 class ResultPointsAndTransitions: public Counted {
   private:
     Ref<ResultPoint> to_;
     Ref<ResultPoint> from_;
     int transitions_;

   public:
     ResultPointsAndTransitions();
     ResultPointsAndTransitions(Ref<ResultPoint> from, Ref<ResultPoint> to, int transitions);
     Ref<ResultPoint> getFrom();
     Ref<ResultPoint> getTo();
     int getTransitions();
 };

 class Detector: public Counted {
   private:
     Ref<BitMatrix> image_;

   protected:
     Ref<BitMatrix> sampleGrid(Ref<BitMatrix> image, int dimensionX, int dimensionY,
         Ref<PerspectiveTransform> transform);

     void insertionSort(std::vector<Ref<ResultPointsAndTransitions> >& vector);

     Ref<ResultPoint> correctTopRightRectangular(Ref<ResultPoint> bottomLeft,
         Ref<ResultPoint> bottomRight, Ref<ResultPoint> topLeft, Ref<ResultPoint> topRight,
         int dimensionTop, int dimensionRight);
     Ref<ResultPoint> correctTopRight(Ref<ResultPoint> bottomLeft, Ref<ResultPoint> bottomRight,
         Ref<ResultPoint> topLeft, Ref<ResultPoint> topRight, int dimension);
     bool isValid(Ref<ResultPoint> p);
     int distance(Ref<ResultPoint> a, Ref<ResultPoint> b);
     Ref<ResultPointsAndTransitions> transitionsBetween(Ref<ResultPoint> from, Ref<ResultPoint> to);
     int min(int a, int b) {
       return a > b ? b : a;
     }
     /**
      * Ends up being a bit faster than round(). This merely rounds its
      * argument to the nearest int, where x.5 rounds up.
      */
     int round(float d) {
       return (int) (d + 0.5f);
     }

   public:
     Ref<BitMatrix> getImage();
     Detector(Ref<BitMatrix> image);

     virtual Ref<PerspectiveTransform> createTransform(Ref<ResultPoint> topLeft,
         Ref<ResultPoint> topRight, Ref<ResultPoint> bottomLeft, Ref<ResultPoint> bottomRight,
         int dimensionX, int dimensionY);

     Ref<DetectorResult> detect();

   private:
     int compare(Ref<ResultPointsAndTransitions> a, Ref<ResultPointsAndTransitions> b);
 };

 }
 }

 #endif // __DETECTOR_H__