#include "tinbetween.h"

#include "tcurves.h"

#include "tstroke.h"

#include "tpalette.h"

//#include "tcolorstyles.h"

//#include "tregion.h"

#include "tmathutil.h"

//#include "tstrokeutil.h"

//#include "tsystem.h"

#include <utility></utility>

#include <limits></limits>

#include <list></list>

#include "../tvectorimage/tvectorimageP.h"

//#include "tdebugmessage.h"

//--------------------------------------------------------------------------------------

static double average(std::vector<double> &values, double range = 2.5) {</double>

  UINT size = values.size();

  if (size == 0) return std::numeric_limits<double>::signaling_NaN();</double>

  if (size == 1) return values[0];

  double sum = 0;

  UINT j     = 0;

  for (; j < size; j++) {

    sum += values[j];

  }

  double average = sum / size;

  double variance = 0;

  for (j = 0; j < size; j++) {

    variance += (average - values[j]) * (average - values[j]);

  }

  variance /= size;

  double err;

  int acceptedNum = 0;

  sum             = 0;

  for (j = 0; j < size; j++) {

    err = values[j] - average;

    err *= err;

    if (err <= range * variance) {

      sum += values[j];

      acceptedNum++;

    }

  }

  assert(acceptedNum > 0);

  return (acceptedNum > 0) ? sum / (double)acceptedNum : average;

}

//--------------------------------------------------------------------------------------

static double weightedAverage(std::vector<double> &values,</double>

                              std::vector<double> &weights,</double>

                              double range = 2.5) {

  UINT size = values.size();

  if (size == 0) return std::numeric_limits<double>::signaling_NaN();</double>

  double sum         = 0;

  double totalWeight = 0;

  UINT j             = 0;

  for (; j < size; j++) {

    sum += weights[j] * values[j];

    totalWeight += weights[j];

  }

  assert(totalWeight > 0);

  if (totalWeight == 0) return std::numeric_limits<double>::signaling_NaN();</double>

  double average = sum / totalWeight;

  double variance = 0;

  for (j = 0; j < size; j++) {

    variance += weights[j] * (average - values[j]) * (average - values[j]);

  }

  variance /= totalWeight;

  double err;

  totalWeight = 0;

  sum         = 0;

  for (j = 0; j < size; j++) {

    err = values[j] - average;

    err *= err;

    if (err <= range * variance) {

      sum += weights[j] * values[j];

      totalWeight += weights[j];

    }

  }

  assert(totalWeight > 0);

  return (totalWeight != 0) ? sum / totalWeight : average;

}

//--------------------------------------------------------------------------------------

inline UINT angleNumber(const std::vector<std::pair<int, double="">> &corners,</std::pair<int,>

                        double angle) {

  UINT count = 0;

  UINT size  = corners.size();

  for (UINT j = 0; j < size; j++)

    if (corners[j].second >= angle) count++;

  return count;

}

//--------------------------------------------------------------------------------------

inline bool isTooComplex(UINT n1, UINT n2, UINT maxSubsetNumber = 100) {

  UINT n, r;

  if (n1 > n2) {

    n = n1;

    r = n2;

  } else if (n1 < n2) {

    n = n2;

    r = n1;

  } else {

    assert(!"equal angle number");

    return false;

  }

  if (n - r < r) r = n - r;

  /*

n*(n-1)* ...(n-r+1) < n^r that must be <= 2^(num bits of UINT)-1

s:=sizeof(UINT)*8

if

n <= 2^( (s-1)/r)   =>

log n <= (s-1)/r    (the base of log is 2)  =>

r*log n <= s-1      =>

log n^r <= log 2^(s-1)   =>

n^r <= 2^(s-1) <  (2^s)-1

*/

  const UINT one = 1;

  if (n > (one << ((sizeof(UINT) * 8 - 1) / r))) return true;

  UINT product1 = n;  // product1 = n*(n-1)* ...(n-r+1)

  for (UINT i = 1; i < r; i++) product1 *= --n;

  UINT rFact = r;

  while (r > 1) rFact *= --r;

  return (product1 / rFact > maxSubsetNumber);

  // product1/rFact is number of combination

  //  ( n )

  //  ( r )

}

//--------------------------------------------------------------------------------------

static void eraseSmallAngles(std::vector<std::pair<int, double="">> &corners,</std::pair<int,>

                             double angle) {

  std::vector<std::pair<int, double="">>::iterator it = corners.begin();</std::pair<int,>

  while (it != corners.end()) {

    if ((*it).second < angle)

      it = corners.erase(it);

    else

      ++it;

  }

}

//--------------------------------------------------------------------------------------

// output:

// min is the minimum angle greater or equal to minDegree (i.e the minimum angle

// of the corners)

// max is tha maximum angle greater or equal to minDegree

static void detectCorners(const TStroke *stroke, double minDegree,

                          std::vector<std::pair<int, double="">> &corners,</std::pair<int,>

                          double &min, double &max) {

  const double minSin = fabs(sin(minDegree * M_PI_180));

  double angle, vectorialProduct, metaCornerLen, partialLen;

  UINT quadCount1 = stroke->getChunkCount();

  TPointD speed1, speed2;

  int j;

  TPointD tan1, tan2;

  min = 180;

  max = minDegree;

  for (j = 1; j < (int)quadCount1; j++) {

    speed1 = stroke->getChunk(j - 1)->getSpeed(1);

    speed2 = stroke->getChunk(j)->getSpeed(0);

    if (!(speed1 == TPointD() || speed2 == TPointD())) {

      tan1 = normalize(speed1);

      tan2 = normalize(speed2);

      vectorialProduct = fabs(cross(tan1, tan2));

      if (tan1 * tan2 < 0) {

        angle = 180 - asin(tcrop(vectorialProduct, -1.0, 1.0)) * M_180_PI;

        corners.push_back(std::make_pair(j, angle));

        //------------------------------------------

        //        TDebugMessage::getStream()<

        //        TDebugMessage::flush();

        //------------------------------------------

        if (min > angle) min = angle;

        if (max < angle) max = angle;

      } else if (vectorialProduct >= minSin) {

        angle = asin(tcrop(vectorialProduct, -1.0, 1.0)) * M_180_PI;

        corners.push_back(std::make_pair(j, angle));

        //------------------------------------------

        //        TDebugMessage::getStream()<

        //        TDebugMessage::flush();

        //------------------------------------------

        if (min > angle) min = angle;

        if (max < angle) max = angle;

      }

    }

  }

  const double ratioLen   = 2.5;

  const double ratioAngle = 0.2;

  std::vector<std::pair<int, double="">>::iterator it = corners.begin();</std::pair<int,>

  for (j = 1; j < (int)quadCount1;

       j++)  //"meta angoli" ( meta perche' derivabili)

  {

    if (it != corners.end() && j == (*it).first) {

      ++it;

      continue;

    }

    if (j - 2 >= 0 && (corners.empty() || it == corners.begin() ||

                       j - 1 != (*(it - 1)).first) &&

        j + 1 < (int)quadCount1 &&

        (corners.empty() || it == corners.end() || j + 1 != (*it).first)) {

      speed1 = stroke->getChunk(j - 2)->getSpeed(1);

      speed2 = stroke->getChunk(j + 1)->getSpeed(0);

      if (!(speed1 == TPointD() || speed2 == TPointD())) {

        tan1             = normalize(speed1);

        tan2             = normalize(speed2);

        vectorialProduct = fabs(cross(tan1, tan2));

        if (tan1 * tan2 < 0) {

          angle = 180 - asin(tcrop(vectorialProduct, -1.0, 1.0)) * M_180_PI;

          metaCornerLen = ratioLen * (stroke->getChunk(j - 1)->getLength() +

                                      stroke->getChunk(j)->getLength());

          partialLen     = 0;

          bool goodAngle = false;

          for (int i = j - 3;

               i >= 0 && (corners.empty() || it == corners.begin() ||

                          i + 1 != (*(it - 1)).first);

               i--) {

            tan1 = stroke->getChunk(i)->getSpeed(1);

            if (tan1 == TPointD()) continue;

            tan1 = normalize(tan1);

            tan2 = stroke->getChunk(i + 1)->getSpeed(1);

            if (tan2 == TPointD()) continue;

            tan2 = normalize(tan2);

            vectorialProduct = fabs(cross(tan1, tan2));

            double nearAngle =

                asin(tcrop(vectorialProduct, -1.0, 1.0)) * M_180_PI;

            if (tan1 * tan2 < 0) nearAngle = 180 - nearAngle;

            if (nearAngle > ratioAngle * angle) break;

            partialLen += stroke->getChunk(i)->getLength();

            if (partialLen > metaCornerLen) {

              goodAngle = true;

              break;

            }

          }

          if (goodAngle) {

            partialLen = 0;

            for (int i = j + 2; i + 1 < (int)quadCount1 &&

                                (corners.empty() || it == corners.end() ||

                                 i + 1 != (*it).first);

                 i++) {

              tan1 = stroke->getChunk(i)->getSpeed(0);

              if (tan1 == TPointD()) continue;

              tan1 = normalize(tan1);

              tan2 = stroke->getChunk(i + 1)->getSpeed(0);

              if (tan2 == TPointD()) continue;

              tan2 = normalize(tan2);

              vectorialProduct = fabs(cross(tan1, tan2));

              double nearAngle =

                  asin(tcrop(vectorialProduct, -1.0, 1.0)) * M_180_PI;

              if (tan1 * tan2 < 0) nearAngle = 180 - nearAngle;

              if (nearAngle > 0.1 * angle) break;

              partialLen += stroke->getChunk(i)->getLength();

              if (partialLen > metaCornerLen) {

                goodAngle = true;

                break;

              }

            }

          }

          if (goodAngle) {

            // l'angolo viene un po' declassato in quanto meta

            it = corners.insert(it, std::make_pair(j, angle * 0.7)) + 1;

            if (min > angle) min = angle;

            if (max < angle) max = angle;

            //            TDebugMessage::getStream()<

            //            TDebugMessage::flush();

          }

        }

      }

    }

  }

}

//--------------------------------------------------------------------------------------

static double variance(std::vector<double> &values) {</double>

  UINT size = values.size();

  if (size == 0) return std::numeric_limits<double>::signaling_NaN();</double>

  double sum = 0;

  UINT j     = 0;

  for (; j < size; j++) {

    sum += values[j];

  }

  double average = sum / size;

  double variance = 0;

  for (j = 0; j < size; j++) {

    variance += (average - values[j]) * (average - values[j]);

  }

  return variance / size;

}

//--------------------------------------------------------------------------------------

static void findBestSolution(const TStroke *stroke1, const TStroke *stroke2,

                             std::pair<int, double=""> *partialAngles1,</int,>

                             UINT partialAngles1Size,

                             const std::vector<std::pair<int, double="">> &angles2,</std::pair<int,>

                             UINT r,

                             std::list<std::pair<int, double="">> &partialSolution,</std::pair<int,>

                             double &bestValue, std::vector<int> &bestVector) {</int>

  //-------------------------------------------------------------------

  if (r == partialAngles1Size) {

    UINT j;

    std::vector<std::pair<int, double="">> angles1;</std::pair<int,>

    std::list<std::pair<int, double="">>::iterator it = partialSolution.begin();</std::pair<int,>

    for (; it != partialSolution.end(); ++it) {

      angles1.push_back(*it);

    }

    for (j = 0; j < partialAngles1Size; j++) {

      angles1.push_back(partialAngles1[j]);

    }

    UINT angles1Size = angles1.size();

    std::vector<double> rationAngles(angles1Size), ratioLength(angles1Size + 1);</double>

    std::vector<double> ratioX, ratioY;</double>

    for (j = 0; j < angles1Size; j++) {

      rationAngles[j] = fabs(angles1[j].second - angles2[j].second) /

                        (angles1[j].second + angles2[j].second);

    }

    UINT firstQuad1 = 0;

    UINT firstQuad2 = 0;

    UINT nextQuad1, nextQuad2;

    TRectD bbox1 = stroke1->getBBox();

    TRectD bbox2 = stroke2->getBBox();

    double app, div;

    double invTotalLen1 = stroke1->getLength();

    assert(invTotalLen1 > 0);

    invTotalLen1 = 1.0 / invTotalLen1;

    double invTotalLen2 = stroke2->getLength();

    assert(invTotalLen2 > 0);

    invTotalLen2 = 1.0 / invTotalLen2;

    for (j = 0; j <= angles1Size; j++) {

      if (j < angles1Size) {

        nextQuad1 = angles1[j].first;

        nextQuad2 = angles2[j].first;

      } else {

        nextQuad1 = stroke1->getChunkCount();

        nextQuad2 = stroke2->getChunkCount();

      }

      ratioLength[j] =

          fabs(stroke1->getLengthAtControlPoint(nextQuad1 * 2) * invTotalLen1 -

               stroke2->getLengthAtControlPoint(nextQuad2 * 2) * invTotalLen2);

      TPointD p1(stroke1->getChunk(nextQuad1 - 1)->getP2() -

                 stroke1->getChunk(firstQuad1)->getP0());

      p1.x = fabs(p1.x);

      p1.y = fabs(p1.y);

      TPointD p2(stroke2->getChunk(nextQuad2 - 1)->getP2() -

                 stroke2->getChunk(firstQuad2)->getP0());

      p2.x = fabs(p2.x);

      p2.y = fabs(p2.y);

      app = fabs(bbox1.getLx() * p2.x - bbox2.getLx() * p1.x);

      div = (bbox1.getLx() * p2.x + bbox2.getLx() * p1.x);

      if (div) ratioX.push_back(app / div);

      app = fabs(bbox1.getLy() * p2.y - bbox2.getLy() * p1.y);

      div = (bbox1.getLy() * p2.y + bbox2.getLy() * p1.y);

      if (div) ratioY.push_back(app / div);

      firstQuad1 = nextQuad1;

      firstQuad2 = nextQuad2;

    }

    double varAng, varX, varY, varLen;

    varX   = average(ratioX);

    varY   = average(ratioY);

    varLen = average(ratioLength);

    varAng = average(rationAngles);

    double estimate = varX + varY + varAng + varLen;

    /*

#ifdef _DEBUG

for(UINT dI=0; dI

{

TDebugMessage::getStream() << angles1[dI].first<<"  ";

}

TDebugMessage::flush();

TDebugMessage::getStream() <<"estimate "<< estimate<<"=" ;

TDebugMessage::flush();

TDebugMessage::getStream()<

TDebugMessage::flush();

TDebugMessage::getStream()<

TDebugMessage::flush();

TDebugMessage::getStream()<

TDebugMessage::flush();

TDebugMessage::getStream()<

TDebugMessage::flush();

#endif

*/

    if (estimate < bestValue) {

      bestValue = estimate;

      if (bestVector.size() != angles1Size) {

        assert(!"bad size for bestVector");

        bestVector.resize(angles1Size);

      }

      for (j = 0; j < angles1Size; j++) {

        bestVector[j] = angles1[j].first;

      }

    }

    return;

  }

  //-------------------------------------------------------------------

  if (r == 1) {

    for (UINT i = 0; i < partialAngles1Size; i++) {

      findBestSolution(stroke1, stroke2, partialAngles1 + i, 1, angles2, 1,

                       partialSolution, bestValue, bestVector);

    }

    return;

  }

  partialSolution.push_back(partialAngles1[0]);

  findBestSolution(stroke1, stroke2, partialAngles1 + 1, partialAngles1Size - 1,

                   angles2, r - 1, partialSolution, bestValue, bestVector);

  partialSolution.pop_back();

  findBestSolution(stroke1, stroke2, partialAngles1 + 1, partialAngles1Size - 1,

                   angles2, r, partialSolution, bestValue, bestVector);

}

//--------------------------------------------------------------------------------------

static void findBestSolution(const TStroke *stroke1, const TStroke *stroke2,

                             std::vector<std::pair<int, double="">> &angles1,</std::pair<int,>

                             const std::vector<std::pair<int, double="">> &angles2,</std::pair<int,>

                             double &bestValue, std::vector<int> &bestVector) {</int>

  assert(angles1.size() > angles2.size());

  std::list<std::pair<int, double="">> partialSolution;</std::pair<int,>

  findBestSolution(stroke1, stroke2, &(angles1[0]), angles1.size(), angles2,

                   angles2.size(), partialSolution, bestValue, bestVector);

}

//--------------------------------------------------------------------------------------

static void trivialSolution(const TStroke *stroke1, const TStroke *stroke2,

                            const std::vector<std::pair<int, double="">> &angles1,</std::pair<int,>

                            const std::vector<std::pair<int, double="">> &angles2,</std::pair<int,>

                            std::vector<int> &solution) {</int>

  assert(angles1.size() > angles2.size());

  UINT j;

  double subStrokeRatio2;

  double invTotalLen2 = stroke2->getLength();

  assert(invTotalLen2);

  invTotalLen2 = 1.0 / invTotalLen2;

  double invTotalLen1 = stroke1->getLength();

  assert(invTotalLen1 > 0);

  invTotalLen1 = 1.0 / invTotalLen1;

  if (solution.size() != angles2.size()) {

    assert(!"bad size for solution");

    solution.resize(angles2.size());

  }

  int toBeErased = angles1.size() - angles2.size();

  UINT count     = 0;

  double diff, ratio, oldRatio = 100;

  subStrokeRatio2 =

      stroke2->getLengthAtControlPoint(angles2[count].first * 2) * invTotalLen2;

  for (j = 0; j < angles1.size() && count < solution.size(); j++) {

    if (toBeErased == 0) {

      solution[count++] = angles1[j].first;

    } else {

      ratio =

          stroke1->getLengthAtControlPoint(angles1[j].first * 2) * invTotalLen1;

      assert(ratio > 0 && ratio <= 1);

      diff = ratio - subStrokeRatio2;

      if (diff >= 0) {

        if (fabs(diff) < fabs(oldRatio - subStrokeRatio2)) {

          solution[count] = angles1[j].first;

          oldRatio        = 100;

        } else {

          assert(j > 0);

          solution[count] = angles1[j - 1].first;

        }

        count++;

        if (angles2.size() < count)

          subStrokeRatio2 =

              stroke2->getLengthAtControlPoint(angles2[count].first * 2) *

              invTotalLen2;

        else

          subStrokeRatio2 = 1;

      } else {

        toBeErased--;

        oldRatio = ratio;

      }

    }

  }

  assert(count == solution.size());

}

//--------------------------------------------------------------------------------------

static TStroke *extract(const TStroke *source, UINT firstQuad, UINT lastQuad) {

  UINT quadCount = source->getChunkCount();

  if (firstQuad >= quadCount) {

    assert(!"bad quadric index");

    firstQuad = quadCount - 1;

  }

  if (lastQuad < firstQuad) {

    assert(!"bad quadric index");

    lastQuad = firstQuad;

  }

  if (lastQuad >= quadCount) {

    assert(!"bad quadric index");

    lastQuad = quadCount - 1;

  }

  UINT cpIndex0 = firstQuad * 2;

  UINT cpIndex1 = lastQuad * 2 + 2;

  std::vector<tthickpoint> points(cpIndex1 - cpIndex0 + 1);</tthickpoint>

  UINT count = 0;

  for (UINT j = cpIndex0; j <= cpIndex1; j++) {

    points[count++] = source->getControlPoint(j);

  }

  return new TStroke(points);

}

//--------------------------------------------------------------------------------------

static void sample(const TStroke *stroke, int samplingSize,

                   std::vector<tpointd> &sampledPoint) {</tpointd>

  double samplingFrequency = 1.0 / (double)samplingSize;

  sampledPoint.resize(samplingSize);

  double totalLen = stroke->getLength();

  double step     = totalLen * samplingFrequency;

  double len      = 0;

  for (int p = 0; p < samplingSize - 1; p++) {

    sampledPoint[p] = stroke->getPointAtLength(len);

    len += step;

  }

  sampledPoint.back() =

      stroke->getControlPoint(stroke->getControlPointCount() - 1);

}

//--------------------------------------------------------------------------------------

class TInbetween::Imp {

public:

  //----------------------

  struct StrokeTransform {

    typedef enum { EQUAL, POINT, GENERAL } TransformationType;

    TPointD m_translate;

    TPointD m_rotationAndScaleCenter;

    double m_scaleX, m_scaleY, m_rotation;

    TransformationType m_type;

    // saved for optimization

    TAffine m_inverse;

    std::vector<int> m_firstStrokeCornerIndexes;</int>

    std::vector<int> m_secondStrokeCornerIndexes;</int>

  };

  //----------------------

  TVectorImageP m_firstImage, m_lastImage;

  std::vector<stroketransform> m_transformation;</stroketransform>

  void computeTransformation();

  void transferColor(const TVectorImageP &destination) const;

  TVectorImageP tween(double t) const;

  Imp(const TVectorImageP firstImage, const TVectorImageP lastImage)

      : m_firstImage(firstImage), m_lastImage(lastImage) {

    computeTransformation();

  }

};

//-------------------------------------------------------------------

TInbetween::TInbetween(const TVectorImageP firstImage,

                       const TVectorImageP lastImage)

    : m_imp(new TInbetween::Imp(firstImage, lastImage)) {}

//-------------------------------------------------------------------

TInbetween::~TInbetween() {}

//-------------------------------------------------------------------

void TInbetween::Imp::computeTransformation() {

  const UINT samplingPointNumber = 10;

  const UINT bboxSamplingWeight  = samplingPointNumber / 2;

  StrokeTransform transform;

  double cs, sn, totalLen1, totalLen2, constK, constQ, constB, constD, constA;

  UINT cpCount1, cpCount2;

  TPointD stroke1Centroid, stroke2Centroid, stroke1Begin, stroke2Begin,

      stroke1End, stroke2End, versor1, versor2;

  std::vector<tpointd> samplingPoint1(samplingPointNumber),</tpointd>

      samplingPoint2(samplingPointNumber);

  TStroke *stroke1, *stroke2;

  std::vector<double> ratioSampling, weigths, subStrokeXScaling,</double>

      subStrokeYScaling;

  UINT strokeCount1 = m_firstImage->getStrokeCount();

  UINT strokeCount2 = m_lastImage->getStrokeCount();

  if (strokeCount1 > strokeCount2) strokeCount1 = strokeCount2;

  m_transformation.clear();

  m_transformation.reserve(strokeCount1);

  const int maxSubSetNum = (strokeCount1) ? 1000 / strokeCount1 : 1;

  UINT j, p;

  for (UINT i = 0; i < strokeCount1; i++) {

    stroke1 = m_firstImage->getStroke(i);

    stroke2 = m_lastImage->getStroke(i);

    // check if the strokes are equal

    cpCount1 = stroke1->getControlPointCount();

    cpCount2 = stroke2->getControlPointCount();

    transform.m_firstStrokeCornerIndexes.clear();

    transform.m_secondStrokeCornerIndexes.clear();

    transform.m_translate              = TPointD();

    transform.m_rotationAndScaleCenter = TPointD();

    transform.m_scaleX                 = 0;

    transform.m_scaleY                 = 0;

    transform.m_rotation               = 0;

    bool isEqual = true;

    if (cpCount1 == cpCount2) {

      for (j = 0; j < cpCount1 && isEqual; j++) {

        isEqual = (stroke1->getControlPoint(j) == stroke2->getControlPoint(j));

      }

    } else

      isEqual = false;

    if (isEqual) {

      transform.m_type = StrokeTransform::EQUAL;

    } else {

      totalLen1 = stroke1->getLength();

      totalLen2 = stroke2->getLength();

      if (totalLen1 == 0 || totalLen2 == 0) {

        if (totalLen1 == 0 && totalLen2 == 0) {

          transform.m_type = StrokeTransform::POINT;

        } else {

          transform.m_inverse = TAffine();

          transform.m_firstStrokeCornerIndexes.resize(2);

          transform.m_firstStrokeCornerIndexes[0] = 0;

          transform.m_firstStrokeCornerIndexes[1] = stroke1->getChunkCount();

          transform.m_secondStrokeCornerIndexes.resize(2);

          transform.m_secondStrokeCornerIndexes[0] = 0;

          transform.m_secondStrokeCornerIndexes[1] = stroke2->getChunkCount();

        }

      } else {

        const double startMinAngle = 30.0;

        std::vector<std::pair<int, double="">> angles1, angles2;</std::pair<int,>

        transform.m_type = StrokeTransform::GENERAL;

        double minAngle, maxAngle;

        int minAngle1, maxAngle1, minAngle2, maxAngle2;

        angles1.clear();

        angles2.clear();

        //        TDebugMessage::getStream()<

        //        TDebugMessage::flush();

        detectCorners(stroke1, startMinAngle, angles1, minAngle, maxAngle);

        minAngle1 = (int)minAngle;

        maxAngle1 = (int)maxAngle;

        //        TDebugMessage::getStream()<

        //        TDebugMessage::flush();

        detectCorners(stroke2, startMinAngle, angles2, minAngle, maxAngle);

        minAngle2 = (int)minAngle;

        maxAngle2 = (int)maxAngle;

        if (angles1.empty()) angles2.clear();

        if (angles2.empty()) angles1.clear();

        /*

debugStream.open("c:\\temp\\inbetween.txt", ios_base::out);

debugStream <<"num angoli 1: "<< angles1.size() << endl;

debugStream <<"num angoli 2: "<< angles2.size() << endl;

*/

        double bestValue = (std::numeric_limits<double>::max)();</double>

        if (angles1.size() != angles2.size()) {

          bestValue = (std::numeric_limits<double>::max)();</double>

          //--------------------------------------------------------------------------

          if (isTooComplex(angles1.size(), angles2.size(), maxSubSetNum)) {

            // debugStream <<"is too complex" << endl;

            int firstAngle =

                (int)((angles1.size() < angles2.size()) ? minAngle2

                                                        : minAngle1);

            int lastAngle =

                (int)((angles1.size() < angles2.size()) ? maxAngle1

                                                        : maxAngle2);

            int bestAngle = (int)startMinAngle;

            if ((int)(angles1.size() + angles2.size()) <

                lastAngle - firstAngle + 1) {

              double tempAngle;

              std::vector<double> sortedAngles1, sortedAngles2;</double>

              sortedAngles1.reserve(angles1.size());

              sortedAngles2.reserve(angles2.size());

              for (j = 0; j < angles1.size(); j++) {

                tempAngle = angles1[j].second;

                if (tempAngle >= firstAngle && tempAngle <= lastAngle)

                  sortedAngles1.push_back(tempAngle);

              }

              for (j = 0; j < angles2.size(); j++) {

                tempAngle = angles2[j].second;

                if (tempAngle >= firstAngle && tempAngle <= lastAngle)

                  sortedAngles2.push_back(tempAngle);

              }

              std::vector<double> sortedAngles(sortedAngles1.size() +</double>

                                               sortedAngles2.size());

              std::sort(sortedAngles1.begin(), sortedAngles1.end());

              std::sort(sortedAngles2.begin(), sortedAngles2.end());

              std::merge(sortedAngles1.begin(), sortedAngles1.end(),

                         sortedAngles2.begin(), sortedAngles2.end(),

                         sortedAngles.begin());

              for (j = 0; j < sortedAngles.size(); j++) {

                int numAng1 = angleNumber(angles1, sortedAngles[j]);

                int numAng2 = angleNumber(angles2, sortedAngles[j]);

                double val  = (numAng1 == numAng2)

                                 ? 0

                                 : fabs((float)(numAng1 - numAng2)) /

                                       (numAng1 + numAng2);

                if (val < bestValue) {

                  bestValue = val;

                  bestAngle = (int)(sortedAngles[j]);

                  if (bestValue == 0 ||

                      !isTooComplex(numAng1, numAng2, maxSubSetNum))

                    break;

                }

              }

            } else  //-----------------------------------------------------

            {

              for (int angle = firstAngle; angle <= lastAngle; angle++) {

                int numAng1 = angleNumber(angles1, angle);

                int numAng2 = angleNumber(angles2, angle);

                double val  = (numAng1 == numAng2)

                                 ? 0

                                 : fabs((float)(numAng1 - numAng2)) /

                                       (numAng1 + numAng2);

                if (val < bestValue) {

                  bestValue = val;

                  bestAngle = angle;

                  if (bestValue == 0 ||

                      !isTooComplex(numAng1, numAng2, maxSubSetNum))

                    break;

                }

              }

            }

            eraseSmallAngles(angles1, bestAngle);

            eraseSmallAngles(angles2, bestAngle);

            /*

debugStream <<"bestAngle: "<< bestAngle << endl;

debugStream <<"num angoli 1: "<< angles1.size() << endl;

debugStream <<"num angoli 2: "<< angles2.size() << endl;

*/

          }

          //--------------------------------------------------------------------------

          bestValue = (std::numeric_limits<double>::max)();</double>

          if (angles1.size() == angles2.size()) {

            transform.m_firstStrokeCornerIndexes.push_back(0);

            for (j = 0; j < angles1.size(); j++)

              transform.m_firstStrokeCornerIndexes.push_back(angles1[j].first);

            transform.m_firstStrokeCornerIndexes.push_back(

                stroke1->getChunkCount());