#include <tools modifierline.h="" modifiers=""></tools>

//*****************************************************************************************

//    TModifierLine implementation

//*****************************************************************************************

static inline void calcFixedAngle(const TTrackPoint &p0, TTrackPoint &p1) {

  TPointD p = p1.position - p0.position;

  double l  = sqrt(p.x * p.x + p.y * p.y);

  if (l < TConsts::epsilon) {

    p = TPointD();

  } else {

    double a = atan2(p.y, p.x);

    a        = round(a * 4 / M_PI) * M_PI / 4;

    p.x      = cos(a) * l;

    p.y      = sin(a) * l;

  }

  p1.position = p0.position + p;

}

TTrackPoint TModifierLine::Modifier::calcPoint(double originalIndex) {

  if (original.empty()) return TTrackPoint();

  if (original.size() < 2) return original.front();

  TTrackPoint p0 = original.front();

  TTrackPoint p1 = original.back();

  if (fixAngle) calcFixedAngle(p0, p1);

  return TTrack::interpolationLinear(p0, p1,

                                     originalIndex / (original.size() - 1));

}

void TModifierLine::modifyTrack(const TTrack &track,

                                TTrackList &outTracks) {

  if (!track.handler) {

    track.handler       = new TTrackHandler(track);

    Modifier *modifier  = new Modifier(*track.handler);

    track.handler->tracks.push_back(new TTrack(modifier));

  }

  if (!track.changed()) return;

  if (track.handler->tracks.empty()) return;

  TTrack &subTrack   = *track.handler->tracks.front();

  Modifier *modifier = dynamic_cast<modifier *="">(subTrack.modifier.getPointer());</modifier>

  if (!modifier) {

    track.resetChanges();

    return;

  }

  bool fixAngle = track.getKeyState(track.back()).isPressed(TKey::control);

  outTracks.push_back(track.handler->tracks.front());

  int i1             = track.size();

  int i0             = i1 - track.pointsAdded;

  double maxPressure = modifier->maxPressure;

  if (track.pointsRemoved) {

    maxPressure = 0;

    i0          = 0;

  }

  for (int i = i0; i < i1; ++i) {

    double p = track[i].pressure;

    if (maxPressure < p) maxPressure = p;

  }

  modifier->maxPressure = maxPressure;

  modifier->fixAngle    = fixAngle;

  subTrack.truncate(0);

  if (track.size() > 0) {

    TTrackPoint p   = track.front();

    p.originalIndex = 0;

    p.pressure      = maxPressure;

    p.tilt          = TPointD();

    subTrack.push_back(p, false);

  }

  if (track.size() > 1) {

    TTrackPoint p   = track.back();

    p.originalIndex = track.size() - 1;

    p.pressure      = maxPressure;

    p.tilt          = TPointD();

    if (fixAngle) calcFixedAngle(subTrack.front(), p);

    subTrack.push_back(p, false);

  }

  if (track.fixedFinished())

    subTrack.fix_all();

  track.resetChanges();

}