#include "toonzqt/tonecurvefield.h"

#include "toonzqt/fxhistogramrender.h"

#include "toonzqt/intpairfield.h"

#include "toonzqt/checkbox.h"

#include <qpainter></qpainter>

#include <qpainterpath></qpainterpath>

#include <qstackedwidget></qstackedwidget>

#include <qmouseevent></qmouseevent>

#include <qapplication></qapplication>

#include <qhboxlayout></qhboxlayout>

#include <qcombobox></qcombobox>

#include <qlabel></qlabel>

using namespace DVGui;

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

namespace {

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

double getPercentAtPoint(QPointF point, QPainterPath path) {

  int i;

  for (i = 1; i < 100; i++) {

    double p          = double(i) * 0.01;

    QPointF pathPoint = path.pointAtPercent(p);

    if (abs(pathPoint.x() - point.x()) < 3 &&

        abs(pathPoint.y() - point.y()) < 3)

      return p;

  }

  return 0;

}

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

QList<qpointf> getIntersectedPoint(QRectF rect, QPainterPath path) {</qpointf>

  int y0 = rect.top();

  int y1 = rect.bottom();

  QList<qpointf> points;</qpointf>

  double g      = 1.0 / 256.0;

  QPointF prec  = path.pointAtPercent(0);

  QPointF point = path.pointAtPercent(g);

  int j         = 0;

  for (j = 2; j < 256; j++) {

    QPointF next = path.pointAtPercent(double(j) * g);

    if (prec.y() >= y0 && prec.y() <= y1) {

      if (point.y() < y0)

        points.push_back(QPointF(prec.x(), y0));

      else if (point.y() > y1)

        points.push_back(QPointF(prec.x(), y1));

    }

    if (next.y() >= y0 && next.y() <= y1) {

      if (point.y() < y0)

        points.push_back(QPointF(next.x(), y0));

      else if (point.y() > y1)

        points.push_back(QPointF(next.x(), y1));

    }

    prec  = point;

    point = next;

  }

  return points;

}

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

double qtNorm2(const QPointF &p) { return p.x() * p.x() + p.y() * p.y(); }

double qtNorm(const QPointF &p) { return sqrt(qtNorm2(p)); }

QPointF qtNormalize(const QPointF &p) {

  double n = qtNorm(p);

  assert(n != 0.0);

  return (1.0 / n) * p;

}

double qtDistance2(const QPointF &p1, const QPointF &p2) {

  return qtNorm2(p2 - p1);

}

double qtDistance(const QPointF &p1, const QPointF &p2) {

  return qtNorm(p2 - p1);

}

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

QPointF getNewFirstHandlePoint(const QPointF &p, const QPointF &nextP,

                               const QPointF &oldHandlePoint) {

  bool canMove  = (nextP.x() - p.x() > 16);

  int yDistance = nextP.y() - p.y();

  double sign   = (yDistance != 0) ? yDistance / abs(yDistance) : 1;

  double t      = qtDistance(p, oldHandlePoint);

  if (!canMove) {

    QPointF normalizedP =

        (yDistance != 0) ? qtNormalize(nextP - p) : QPoint(1, 1);

    return QPointF(p + QPointF(t * normalizedP));

  } else if (abs(oldHandlePoint.x() - p.x()) < 16)

    return QPointF(p.x() + 16, p.y() + sign * sqrt(t * t - 16 * 16));

  return oldHandlePoint;

}

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

QPointF getNewSecondHandlePoint(const QPointF &p, const QPointF &nextP,

                                const QPointF &oldHandlePoint) {

  bool canMove  = (nextP.x() - p.x() > 16);

  int yDistance = p.y() - nextP.y();

  double sign   = (yDistance != 0) ? yDistance / abs(yDistance) : 1;

  double s      = qtDistance(oldHandlePoint, nextP);

  if (!canMove) {

    QPointF normalizedP =

        (yDistance != 0) ? qtNormalize(nextP - p) : QPoint(1, 1);

    return QPointF(nextP - QPointF(s * normalizedP));

  } else if (abs(nextP.x() - oldHandlePoint.x()) < 16)

    return QPointF(nextP.x() - 16, nextP.y() + sign * sqrt(s * s - 16 * 16));

  return oldHandlePoint;

}

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

}  // anonymous namespace

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

//=============================================================================

// ChennelCurveEditor

//=============================================================================

ChennelCurveEditor::ChennelCurveEditor(QWidget *parent,

                                       HistogramView *histogramView)

    : QWidget(parent)

    , m_histogramView(histogramView)

    , m_currentControlPointIndex(-1)

    , m_mouseButton(Qt::NoButton)

    , m_curveHeight(256)

    , m_LeftRightMargin(42)

    , m_TopMargin(9)

    , m_BottomMargin(48)

    , m_isLinear(false) {

  setFixedSize(m_curveHeight + 2 * m_LeftRightMargin + 2,

               m_curveHeight + m_TopMargin + m_BottomMargin);

  setAttribute(Qt::WA_KeyCompression);

  setFocusPolicy(Qt::StrongFocus);

  setMouseTracking(true);

  m_histogramView->setDrawnWidget(this);

  m_histogramView->setGraphHeight(m_curveHeight);

  m_histogramView->setGraphAlphaMask(120);

  m_verticalChannelBar =

      new ChannelBar(0, m_histogramView->getChannelBarColor(), false);

}

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

void ChennelCurveEditor::setPoints(QList<tpointd> points) {</tpointd>

  if (!m_points.isEmpty()) m_points.clear();

  int i;

  for (i = 0; i < points.size(); i++) {

    QPointF p = strokeToViewPoint(points.at(i));

    m_points.push_back(p);

  }

  /*--ポイント位置に合わせてスライダも更新する--*/

  int firstIndex = 3;

  int lastIndex  = m_points.size() - 4;

  emit firstLastXPostionChanged(viewToStrokePoint(m_points.at(firstIndex)).x,

                                viewToStrokePoint(m_points.at(lastIndex)).x);

  update();

}

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

QList<tpointd> ChennelCurveEditor::getPoints() {</tpointd>

  QList<tpointd> points;</tpointd>

  if (m_points.isEmpty()) return points;

  int i;

  for (i = 0; i < m_points.size(); i++)

    points.push_back(viewToStrokePoint(m_points.at(i)));

  return points;

}

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

void ChennelCurveEditor::setFirstLastXPosition(std::pair<int, int=""> values,</int,>

                                               bool isDragging) {

  if (!isDragging) {

    emit controlPointChanged(false);

    return;

  }

  QPointF newX0 = strokeToViewPoint(TPointD(values.first, 0));

  QPointF newX1 = strokeToViewPoint(TPointD(values.second, 0));

  int indexX0 = 3;

  int indexX1 = m_points.size() - 4;

  QPointF x0  = m_points.at(indexX0);

  QPointF x1  = m_points.at(indexX1);

  if (x0.x() != newX0.x()) {

    QPointF delta(newX0.x() - x0.x(), 0);

    moveCentralControlPoint(indexX0, delta);

    update();

  }

  if (x1.x() != newX1.x()) {

    QPointF delta(newX1.x() - x1.x(), 0);

    moveCentralControlPoint(indexX1, delta);

    update();

  }

  m_currentControlPointIndex = -1;

}

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

void ChennelCurveEditor::setLinear(bool isLinear) {

  if (m_isLinear == isLinear) return;

  m_isLinear = isLinear;

  update();

}

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

QPointF ChennelCurveEditor::checkPoint(const QPointF p) {

  QPointF checkedP         = p;

  int y0                   = m_TopMargin + 1;

  int y1                   = m_curveHeight + m_TopMargin;

  if (p.y() < y0) checkedP = QPointF(checkedP.x(), y0);

  if (p.y() > y1) checkedP = QPointF(checkedP.x(), y1);

  int x0                   = m_LeftRightMargin + 1;

  int x1                   = m_curveHeight + m_LeftRightMargin;

  if (p.x() < x0) checkedP = QPointF(x0, checkedP.y());

  if (p.x() > x1) checkedP = QPointF(x1, checkedP.y());

  return checkedP;

}

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

QPointF ChennelCurveEditor::strokeToViewPoint(const TPointD p) {

  double x = p.x + m_LeftRightMargin + 1;

  double y = height() - m_BottomMargin - p.y;

  return QPointF(x, y);

}

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

TPointD ChennelCurveEditor::viewToStrokePoint(const QPointF &p) {

  double x = p.x() - m_LeftRightMargin - 1;

  double y = m_curveHeight - (p.y() - m_TopMargin);

  return TThickPoint(x, y);

}

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

int ChennelCurveEditor::getClosestPointIndex(const QPointF &pos,

                                             double &minDistance2) const {

  int closestPointIndex = -1;

  minDistance2          = 0;

  int i;

  for (i = 0; i < (int)m_points.size(); i++) {

    double distance2 = qtDistance2(pos, m_points.at(i));

    if (closestPointIndex < 0 || distance2 < minDistance2) {

      minDistance2      = distance2;

      closestPointIndex = i;

    }

  }

  return closestPointIndex;

}

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

void ChennelCurveEditor::movePoint(int index, const QPointF delta) {

  QPointF p = m_points.at(index);

  p += delta;

  setPoint(index, p);

  int firstIndex = 3;

  int lastIndex  = m_points.size() - 4;

  if (index == firstIndex)

    emit firstLastXPostionChanged(viewToStrokePoint(p).x,

                                  viewToStrokePoint(m_points.at(lastIndex)).x);

  if (index == lastIndex)

    emit firstLastXPostionChanged(viewToStrokePoint(m_points.at(firstIndex)).x,

                                  viewToStrokePoint(p).x);

}

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

void ChennelCurveEditor::setPoint(int index, const QPointF p) {

  m_points.removeAt(index);

  m_points.insert(index, p);

  int firstIndex = 3;

  int lastIndex  = m_points.size() - 4;

  if (index == firstIndex)

    emit firstLastXPostionChanged(viewToStrokePoint(p).x,

                                  viewToStrokePoint(m_points.at(lastIndex)).x);

  if (index == lastIndex)

    emit firstLastXPostionChanged(viewToStrokePoint(m_points.at(firstIndex)).x,

                                  viewToStrokePoint(p).x);

}

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

void ChennelCurveEditor::moveCurrentControlPoint(const QPointF delta) {

  assert(m_currentControlPointIndex != -1);

  int pointCount = m_points.size();

  /*- セグメントを動かした場合 -*/

  if (isCentralControlPoint(m_currentControlPointIndex))

    moveCentralControlPoint(m_currentControlPointIndex, delta);

  /*- 左のハンドルを動かした場合 -*/

  else if (isLeftControlPoint(m_currentControlPointIndex)) {

    QPointF p0 =

        m_points.at(m_currentControlPointIndex) + QPointF(0, delta.y());

    setPoint(m_currentControlPointIndex, p0);

    if (m_currentControlPointIndex < pointCount - 5) {

      QPointF p2 =

          m_points.at(m_currentControlPointIndex + 2) - QPointF(0, delta.y());

      setPoint(m_currentControlPointIndex + 2, p2);

    }

    emit controlPointChanged(true);

  }

  /*- 右のハンドルを動かした場合 -*/

  else {

    assert(isRightControlPoint(m_currentControlPointIndex));

    QPointF p0 =

        m_points.at(m_currentControlPointIndex) + QPointF(0, delta.y());

    setPoint(m_currentControlPointIndex, p0);

    if (m_currentControlPointIndex > 4) {

      QPointF p2 =

          m_points.at(m_currentControlPointIndex - 2) - QPointF(0, delta.y());

      setPoint(m_currentControlPointIndex - 2, p2);

    }

    emit controlPointChanged(true);

  }

  update();

}

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

void ChennelCurveEditor::moveCentralControlPoint(int index,

                                                 const QPointF delta) {

  int pointCount = m_points.size();

  assert(index < pointCount - 3 && index > 2);

  QPointF p = m_points.at(index);

  QPointF d = delta;

  // Trovo il valore di delta im modo tale che il punto di controllo non sia

  // trascinato fuori dal range consentito

  int newX         = p.x() + delta.x();

  int newY         = p.y() + delta.y();

  QPointF newPoint = checkPoint(QPoint(newX, newY));

  d                = newPoint - p;

  QPointF nextP       = m_points.at(index + 3);

  QPointF precP       = m_points.at(index - 3);

  double nextDistance = nextP.x() - (p.x() + d.x());

  double precDistance = (p.x() + d.x()) - precP.x();

  // Caso particolare: Punto di controllo corrente == primo visibile,

  //                   Punto di controllo successivo

  //==

  // l'ultimo

  // visibile

  if (index == 3 && index + 3 == pointCount - 4) {

    setPoint(index + 1,

             getNewFirstHandlePoint(p, nextP, m_points.at(index + 1)));

    setPoint(index + 2,

             getNewSecondHandlePoint(p, nextP, m_points.at(index + 2)));

    if (nextDistance < 0) d = QPointF(nextP.x() - p.x(), d.y());

    if (nextDistance < 16) {

      double nextYDistance = nextP.y() - (p.y() + d.y());

      if (nextYDistance > -16 && nextYDistance < 16) {

        double offset = nextYDistance > 0 ? -16 : +16;

        d = QPointF(d.x(), nextP.y() - p.y() + offset);

      }

    }

  }

  // Caso particolare: Punto di controllo corrente == ultimo visibile,

  //                   Punto di controllo precedente

  //==

  // primo

  // visibile

  else if (index - 3 == 3 && index == pointCount - 4) {

    setPoint(index - 2,

             getNewFirstHandlePoint(precP, p, m_points.at(index - 2)));

    setPoint(index - 1,

             getNewSecondHandlePoint(precP, p, m_points.at(index - 1)));

    if (precDistance < 0) d = QPointF(precP.x() - p.x(), d.y());

    if (precDistance < 16) {

      double precYDistance = (p.y() + d.y()) - precP.y();

      if (precYDistance > -16 && precYDistance < 16) {

        double offset = precYDistance > 0 ? 16 : -16;

        d = QPointF(d.x(), precP.y() - p.y() + offset);

      }

    }

  }

  // Altrimenti calcolo il nuovo delta

  else if (nextDistance < 16)

    d = QPointF(nextP.x() - p.x() - 16, d.y());

  else if (precDistance < 16)

    d = QPointF(precP.x() - p.x() + 16, d.y());

  if (d.isNull()) return;

  // Punto di controllo speciale: il primo visualizzato.

  if (index == 3) {

    QPointF dY = QPointF(0, d.y());

    movePoint(index - 1, dY);

    movePoint(index - 2, dY);

    movePoint(index - 3, dY);

  }

  // Punto di controllo speciale: l'ultimo visualizzato.

  if (index == pointCount - 4) {

    QPointF dY = QPointF(0, d.y());

    movePoint(index + 1, dY);

    movePoint(index + 2, dY);

    movePoint(index + 3, dY);

  }

  if (index > 3) movePoint(index - 1, d);

  if (index < pointCount - 4) movePoint(index + 1, d);

  movePoint(index, d);

  emit controlPointChanged(true);

}

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

void ChennelCurveEditor::addControlPoint(double percent) {

  QPainterPath path = getPainterPath();

  QPointF p         = path.pointAtPercent(percent);

  // Cerco il punto di controllo precedente

  int pointCount = m_points.size();

  int beforeControlPointIndex;

  for (beforeControlPointIndex = pointCount - 1; beforeControlPointIndex >= 0;

       beforeControlPointIndex--) {

    QPointF point = m_points.at(beforeControlPointIndex);

    if (isCentralControlPoint(beforeControlPointIndex) && point.x() < p.x())

      break;

  }

  if (beforeControlPointIndex == 0 || beforeControlPointIndex == pointCount - 4)

    return;

  QPointF p0 = checkPoint(m_points.at(beforeControlPointIndex));

  // Se sono troppo vicino al punto di controllo precedente ritorno

  if (abs(p.x() - p0.x()) <= 16) return;

  double beforeControlPointPercent = getPercentAtPoint(p0, path);

  QPointF p1 = checkPoint(m_points.at(beforeControlPointIndex + 1));

  QPointF p2 = checkPoint(m_points.at(beforeControlPointIndex + 2));

  QPointF p3 = checkPoint(m_points.at(beforeControlPointIndex + 3));

  // Se sono troppo vicino al punto di controllo successivo ritorno

  if (abs(p3.x() - p.x()) <= 16) return;

  double nextControlPointPercent = getPercentAtPoint(p3, path);

  // Calcolo la velocita' e quindi il coiffciente angolare.

  double t =

      percent * 100 / (nextControlPointPercent - beforeControlPointPercent);

  double s = t - 1;

  QPointF speed =

      3.0 * ((p1 - p0) * s * s + 2 * (p2 - p0) * s * t + (p3 - p2) * t * t);

  double m = speed.y() / speed.x();

  int newControlPointIndex = beforeControlPointIndex + 3;

  m_points.insert(newControlPointIndex - 1,

                  QPointF(p.x() - 16, p.y() - 16 * m));

  m_points.insert(newControlPointIndex, p);

  m_points.insert(newControlPointIndex + 1,

                  QPointF(p.x() + 16, p.y() + 16 * m));

  m_currentControlPointIndex = newControlPointIndex;

  emit controlPointAdded(newControlPointIndex);

  update();

}

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

void ChennelCurveEditor::removeCurrentControlPoint() {

  removeControlPoint(m_currentControlPointIndex);

}

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

void ChennelCurveEditor::selectNextControlPoint()

{

  int controlPointCount = (int)m_points.size();

  if (controlPointCount == 0)

    return;

  int firstVisibleControlPoint = 3;

  int lastVisibleControlPoint = m_points.size() - 4;

  m_currentControlPointIndex++;

  if (m_currentControlPointIndex < firstVisibleControlPoint || m_currentControlPointIndex > lastVisibleControlPoint)

    m_currentControlPointIndex = firstVisibleControlPoint;

  update();

}

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

void ChennelCurveEditor::selectPreviousControlPoint()

{

  int controlPointCount = (int)m_points.size();

  if (controlPointCount == 0)

    return;

  int firstVisibleControlPoint = 3;

  int lastVisibleControlPoint = m_points.size() - 4;

  m_currentControlPointIndex--;

  if (m_currentControlPointIndex < firstVisibleControlPoint || m_currentControlPointIndex > lastVisibleControlPoint)

    m_currentControlPointIndex = lastVisibleControlPoint;

  update();

}

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

void ChennelCurveEditor::moveCurrentControlPointUp()

{

  if (m_currentControlPointIndex < 0)

    return;

  moveCurrentControlPoint(QPointF(0, -10));

}

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

void ChennelCurveEditor::moveCurrentControlPointDown()

{

  if (m_currentControlPointIndex < 0)

    return;

  moveCurrentControlPoint(QPointF(0, 10));

}

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

void ChennelCurveEditor::removeControlPoint(int index) {

  // Non posso eliminare il primo punto di controllo visibile quindi lo rimetto

  // in condizione iniziale

  if (index <= 4) {

    setPoint(0, strokeToViewPoint(TPointD(-40, 0)));

    setPoint(1, strokeToViewPoint(TPointD(-20, 0)));

    setPoint(2, strokeToViewPoint(TPointD(-20, 0)));

    setPoint(3, strokeToViewPoint(TPointD(0, 0)));

    setPoint(4, strokeToViewPoint(TPointD(16, 16)));

    update();

    emit controlPointChanged(false);

    return;

  }

  // Non posso eliminare il l'ultimo punto di controllo visibile quindi lo

  // rimetto in condizione iniziale

  if (index >= m_points.size() - 5) {

    int i = m_points.size() - 5;

    setPoint(i, strokeToViewPoint(TPointD(239, 239)));

    setPoint(i + 1, strokeToViewPoint(TPointD(255, 255)));

    setPoint(i + 2, strokeToViewPoint(TPointD(275, 255)));

    setPoint(i + 3, strokeToViewPoint(TPointD(275, 255)));

    setPoint(i + 4, strokeToViewPoint(TPointD(295, 255)));

    update();

    emit controlPointChanged(false);

    return;

  }

  int firstIndex = 0;

  if (isCentralControlPoint(index))

    firstIndex = index - 1;

  else if (isLeftControlPoint(index))

    firstIndex = index;

  else

    firstIndex = index - 2;

  m_points.removeAt(firstIndex);

  m_points.removeAt(firstIndex);

  m_points.removeAt(firstIndex);

  emit controlPointRemoved(firstIndex + 1);

  m_currentControlPointIndex = firstIndex - 2;

  update();

}

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

QPainterPath ChennelCurveEditor::getPainterPath() {

  int pointCount = m_points.size();

  if (pointCount == 0) return QPainterPath();

  QPointF p0 = m_points.at(0);

  QPainterPath path(p0);

  int i;

  for (i = 1; i < pointCount; i++) {

    QPointF p1 = m_points.at(i);

    QPointF p2 = m_points.at(++i);

    QPointF p3 = m_points.at(++i);

    path.moveTo(p0);

    if (!m_isLinear)

      path.cubicTo(p1, p2, p3);

    else

      path.lineTo(p3);

    p0 = p3;

  }

  // Cerco le eventuali intersezioni con il bordo.

  QRectF rect(m_LeftRightMargin, m_TopMargin, m_curveHeight, m_curveHeight);

  QRectF r = path.boundingRect();

  if (!rect.contains(QRect(rect.left(), r.top(), rect.width(), r.height()))) {

    QList<qpointf> points = getIntersectedPoint(rect, path);</qpointf>

    // Se trovo punti di intersezione (per come e' definita la curva devono

    // essere pari)

    // faccio l'unione del path calcolato e di nuovi path lineari.

    int j = 0;

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

      QPointF p0 = points.at(j);

      QPointF p1 = points.at(++j);

      QPainterPath line(p0);

      line.lineTo(p1);

      path.addPath(line);

    }

  }

  return path;

}

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

void ChennelCurveEditor::paintEvent(QPaintEvent *e) {

  QPainter painter(this);

  // Disegno il reticolato

  painter.setRenderHint(QPainter::Antialiasing, false);

  painter.setPen(QColor(250, 250, 250));

  int i;

  int d = m_curveHeight * 0.25;

  for (i = 1; i < 16; i++) {

    // linee orizzontali

    int delta = m_TopMargin + 16 * i;

    int j;

    for (j = 1; j < 4; j++)

      painter.drawLine(QPoint((j - 1) * d + m_LeftRightMargin + 1, delta),

                       QPoint(j * d + m_LeftRightMargin - 1, delta));

    painter.drawLine(QPoint((4 - 1) * d + m_LeftRightMargin + 1, delta),

                     QPoint(4 * d + m_LeftRightMargin, delta));

    // linee verticali

    delta = m_LeftRightMargin + 1 + 16 * i;

    if (i % 4 == 0) continue;

    for (j = 1; j < 5; j++)

      painter.drawLine(QPoint(delta, (j - 1) * d + m_TopMargin),

                       QPoint(delta, j * d + m_TopMargin - 1));

  }

  // Disegno l'histogram.

  m_histogramView->draw(&painter, QPoint(m_LeftRightMargin - 10, 0));

  // Disegno la barra verticale a sinistra.

  m_verticalChannelBar->draw(

      &painter,

      QPoint(0, -2));  //-1 == m_topMargin- il margine della barra(=10+1).

  QRectF r = rect().adjusted(m_LeftRightMargin, m_TopMargin, -m_LeftRightMargin,

                             -m_BottomMargin);

  // Disegno la curva entro i limiti del grafo

  painter.setClipRect(r, Qt::IntersectClip);

  QPainterPath path = getPainterPath();

  if (path.isEmpty()) return;

  painter.setRenderHint(QPainter::Antialiasing, true);

  painter.setPen(Qt::black);

  painter.setBrush(Qt::NoBrush);

  painter.drawPath(path);

  // Disegno i punti di controllo (esclusi i primi tre e gli ultimi tre)

  r         = r.adjusted(-5, -5, 5, 5);

  int n     = m_points.size();

  QPointF p = m_points.at(3);

  for (i = 3; i < n - 3; i++) {

    QBrush brush(Qt::white);

    int rad       = 3;

    QPointF nextP = m_points.at(i + 1);

    if (isCentralControlPoint(i))

      rad = 4;

    else if (m_isLinear) {

      p = nextP;

      continue;

    }

    if (m_currentControlPointIndex == i) brush = QBrush(Qt::black);

    painter.setBrush(brush);

    painter.setPen(Qt::black);

    if (!m_isLinear) {

      if (isLeftControlPoint(i))

        painter.drawLine(p, nextP);

      else if (isCentralControlPoint(i) && i < n - 4)

        painter.drawLine(p, nextP);

    }

    QRectF pointRect(p.x() - rad, p.y() - rad, 2 * rad, 2 * rad);

    painter.drawEllipse(pointRect);

    p = nextP;

  }

}

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

void ChennelCurveEditor::mouseMoveEvent(QMouseEvent *e) {

  if (m_mouseButton == Qt::LeftButton && m_currentControlPointIndex != -1) {

    QPoint pos   = e->pos();

    QPointF posF = QPointF(pos.x(), pos.y());

    moveCurrentControlPoint(posF - m_points.at(m_currentControlPointIndex));

  }

}

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

void ChennelCurveEditor::mousePressEvent(QMouseEvent *e) {

  m_mouseButton = e->button();

  setFocus();

  if (m_mouseButton == Qt::LeftButton) {

    QPoint pos   = e->pos();

    QPointF posF = QPointF(pos.x(), pos.y());

    double minDistance;

    int controlPointIndex = getClosestPointIndex(posF, minDistance);

    // Se la distanza e' piccola seleziono il control point corrente

    if (minDistance < 20)

      m_currentControlPointIndex = controlPointIndex;

    else {

      m_currentControlPointIndex = -1;

      // Se sono sufficentemente lontano da un punto di controllo, ma abbastanza

      // vicino alla curva

      // aggiungo un punto di controllo

      double percent = getPercentAtPoint(posF, getPainterPath());

      if (percent != 0 && minDistance > 20) addControlPoint(percent);

    }

    update();

  }

}

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

void ChennelCurveEditor::mouseReleaseEvent(QMouseEvent *e) {

  /*-- マウスドラッグ中はプレビューを更新しない。ここで初めて更新 --*/

  if (m_mouseButton == Qt::LeftButton && m_currentControlPointIndex != -1 &&

      e->button() == Qt::LeftButton)

    emit controlPointChanged(false);

  m_mouseButton = Qt::NoButton;

}

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

void ChennelCurveEditor::keyPressEvent(QKeyEvent *e) {

  if (e->key() == Qt::Key_Delete) removeCurrentControlPoint();

  if (e->key() == Qt::Key_Right) selectNextControlPoint();

  if (e->key() == Qt::Key_Left) selectPreviousControlPoint();

  if (e->key() == Qt::Key_Up) moveCurrentControlPointUp();

  if (e->key() == Qt::Key_Down) moveCurrentControlPointDown();

}

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

void ChennelCurveEditor::enterEvent(QEvent *) { m_mouseButton = Qt::NoButton; }

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

void ChennelCurveEditor::leaveEvent(QEvent *) { m_mouseButton = Qt::NoButton; }

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

bool ChennelCurveEditor::eventFilter(QObject *object, QEvent *event) {

  if (event->type() == QEvent::Shortcut ||

      event->type() == QEvent::ShortcutOverride) {

    if (!object->inherits("FxSettings")) {

      event->accept();

      return true;

    }

  }

  return false;

}

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

void ChennelCurveEditor::focusInEvent(QFocusEvent *fe) {

  QWidget::focusInEvent(fe);

  qApp->installEventFilter(this);

}

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

void ChennelCurveEditor::focusOutEvent(QFocusEvent *fe) {

  m_currentControlPointIndex = -1;

  emit focusOut();

  QWidget::focusOutEvent(fe);

  qApp->removeEventFilter(this);

  update();

}

//=============================================================================

// ToneCurveField

//=============================================================================

ToneCurveField::ToneCurveField(QWidget *parent,

                               FxHistogramRender *fxHistogramRender)

    : QWidget(parent), m_toneCurveStackedWidget(0) {

  setFixedWidth(368);

  int currentChannelIndex = 0;

  QVBoxLayout *mainLayout = new QVBoxLayout(this);

  mainLayout->setMargin(0);

  mainLayout->setSpacing(0);

  QStringList channels;

  channels << "RGBA"

           << "RGB"

           << "Red"

           << "Green"

           << "Blue"

           << "Alpha";

  int channelCount = channels.size();

  // lista canali: label+comboBox

  QWidget *channelListWidget     = new QWidget(this);

  QHBoxLayout *channelListLayout = new QHBoxLayout(channelListWidget);

  channelListLayout->setMargin(0);

  channelListLayout->setSpacing(0);

  QLabel *channelLabel = new QLabel(tr("Channel:"), channelListWidget);

  channelListLayout->addWidget(channelLabel);

  m_channelListChooser = new QComboBox(channelListWidget);

  m_channelListChooser->setFixedSize(100, 20);

  m_channelListChooser->addItems(channels);

  m_channelListChooser->setCurrentIndex(currentChannelIndex);

  channelListLayout->addWidget(m_channelListChooser);

  channelListWidget->setLayout(channelListLayout);

  mainLayout->addWidget(channelListWidget, 0, Qt::AlignCenter);

  // stack widget dei grafi

  m_toneCurveStackedWidget = new QStackedWidget(this);

  Histograms *histograms   = new Histograms(0, true);

  fxHistogramRender->setHistograms(histograms);

  int i;

  for (i = 0; i < channelCount; i++) {

    ChennelCurveEditor *c =

        new ChennelCurveEditor(this, histograms->getHistogramView(i));

    m_toneCurveStackedWidget->addWidget(c);

    connect(c, SIGNAL(firstLastXPostionChanged(int, int)), this,

            SLOT(onFirstLastXPostionChanged(int, int)));

  }

  QWidget *w          = new QWidget(this);

  QHBoxLayout *layout = new QHBoxLayout(w);

  layout->setMargin(0);

  layout->setSpacing(0);

  layout->addWidget(m_toneCurveStackedWidget);

  w->setLayout(layout);

  mainLayout->addWidget(w, 0, Qt::AlignHCenter);

  m_toneCurveStackedWidget->setCurrentIndex(currentChannelIndex);

  // stack widget degli slider

  m_sliderStackedWidget = new QStackedWidget(this);

  for (i = 0; i < channelCount; i++) {

    IntPairField *intPairSlider = new IntPairField(this);

    intPairSlider->setFixedHeight(20);

    intPairSlider->setLabelsEnabled(false);

    intPairSlider->setRange(0, 255);

    intPairSlider->setValues(std::make_pair(0, 255));

    m_sliderStackedWidget->addWidget(intPairSlider);

    connect(intPairSlider, SIGNAL(valuesChanged(bool)), this,

            SLOT(sliderValueChanged(bool)));

  }

  mainLayout->addWidget(m_sliderStackedWidget);

  m_sliderStackedWidget->setCurrentIndex(currentChannelIndex);

  mainLayout->addSpacing(10);

  m_isLinearCheckBox = new CheckBox(QString("Linear"), this);

  mainLayout->addWidget(m_isLinearCheckBox, 0, Qt::AlignHCenter);

  connect(m_isLinearCheckBox, SIGNAL(clicked(bool)),

          SLOT(setLinearManually(bool)));

  connect(m_isLinearCheckBox, SIGNAL(toggled(bool)), SLOT(setLinear(bool)));

  connect(m_channelListChooser, SIGNAL(currentIndexChanged(int)),

          m_toneCurveStackedWidget, SLOT(setCurrentIndex(int)));

  connect(m_channelListChooser, SIGNAL(currentIndexChanged(int)),