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piece.cpp

/***********************************************************************
 *
 * Copyright (C) 2009 Graeme Gott <graeme@gottcode.org>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 ***********************************************************************/

#include "piece.h"

#include "puzzle.h"

#include <QGraphicsItemAnimation>
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QPen>
#include <QPointF>
#include <QPolygonF>
#include <QRadialGradient>
#include <QTimeLine>
#include <QTimer>

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

Piece::Piece(Puzzle* puzzle)
: QGraphicsEllipseItem(0, 0, 100, 100),
  m_puzzle(puzzle),
  m_gradient(50, 50, 90),
  m_rotations(0),
  m_swap_piece(0) {
      for (int i = 0; i < 6; ++i) {
            m_colors.append(i);
            m_connectors.append(-1);
      }
      setFlag(ItemIsMovable, true);
      setCacheMode(DeviceCoordinateCache);
      setHighlight(false);

      for (int i = 0; i < 24; ++i) {
            m_gradient.setColorAt(static_cast<float>(i) / 24.0f, Qt::black);
      }

      m_rotate_timer = new QTimer(this);
      connect(m_rotate_timer, SIGNAL(timeout()), this, SLOT(rotateConnectors()));
      m_rotate_timer->setInterval(40);

      m_puzzle->addItem(this);

      // Create middle of piece
      QGraphicsEllipseItem* overlay = new QGraphicsEllipseItem(0, 0, 100, 100, this);
      overlay->setPen(Qt::NoPen);
      QRadialGradient gradient(50, 50, 50);
      gradient.setColorAt(0.05, Qt::black);
      gradient.setColorAt(0.15, Qt::transparent);
      overlay->setBrush(gradient);
}

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

bool Piece::setConnector(int offset, int value) {
      if (m_colors.contains(value)) {
            m_connectors[offset] = value;
            m_colors.removeOne(value);

            static QColor connector_colors[6] = {
                  QColor(255, 0, 0),
                  QColor(255, 255, 0),
                  QColor(0, 255, 0),
                  QColor(0, 255, 255),
                  QColor(0, 0, 255),
                  QColor(255, 0, 255)
            };
            m_gradient.setColorAt(static_cast<float>(6 - offset) / 6.0f, connector_colors[value]);
            if (offset == 0) {
                  m_gradient.setColorAt(0, connector_colors[value]);
            }
            setBrush(m_gradient);

            return true;
      } else {
            return false;
      }
}

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

void Piece::setHighlight(bool highlight) {
      setCacheMode(NoCache);
      setPen(QPen(highlight ? Qt::white : Qt::darkGray, 2));
      setZValue(highlight ? 2 : 1);
      setCacheMode(DeviceCoordinateCache);
}

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

void Piece::setPosition(const QPointF& position) {
      m_position = position;
      setPos(m_position);
}

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

void Piece::spin() {
      int rotations = rand() % 6;
      int angle = 90;
      for (int i = 0; i < rotations; ++i) {
            m_connectors.move(5, 0);
            angle -= 60;
      }
      if (angle < 0) {
            angle += 360;
      }
      m_gradient.setAngle(angle);
      setBrush(m_gradient);
}

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

bool Piece::fromString(const QString& string) {
      QStringList values = string.split(",", QString::SkipEmptyParts);
      if (values.count() != 6) {
            return false;
      }

      for (int i = 0; i < 6; ++i) {
            if (!setConnector(i, values[i].toInt())) {
                  return false;
            }
      }
      return true;
}

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

QString Piece::toString() const {
      QStringList values;
      for (int i = 0; i < 6; ++i) {
            values.append(QString::number(m_connectors[i]));
      }
      return values.join(",");
}

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

void Piece::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event) {
      rotate();
      QGraphicsEllipseItem::mouseDoubleClickEvent(event);
}

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

void Piece::mouseMoveEvent(QGraphicsSceneMouseEvent* event) {
      // Find piece containing center
      Piece* swap_piece = 0;
      QList<QGraphicsItem*> items = scene()->items(sceneBoundingRect().center());
      foreach (QGraphicsItem* item, items) {
            Piece* piece = qgraphicsitem_cast<Piece*>(item);
            if (piece && piece != this) {
                  swap_piece = piece;
                  break;
            }
      }

      // Highlight swap piece
      if (swap_piece) {
            if (swap_piece != m_swap_piece) {
                  if (m_swap_piece) {
                        m_swap_piece->setHighlight(false);
                  }
                  m_swap_piece = swap_piece;
                  m_swap_piece->setHighlight(true);
            }
      } else {
            if (m_swap_piece) {
                  m_swap_piece->setHighlight(false);
                  m_swap_piece = 0;
            }
      }

      QGraphicsEllipseItem::mouseMoveEvent(event);
}

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

void Piece::mousePressEvent(QGraphicsSceneMouseEvent* event) {
      if (event->button() == Qt::LeftButton) {
            setZValue(3);
            m_swap_piece = 0;
      } else if (event->button() == Qt::RightButton) {
            rotate();
      }
      QGraphicsEllipseItem::mousePressEvent(event);
}

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

void Piece::mouseReleaseEvent(QGraphicsSceneMouseEvent* event) {
      if (m_swap_piece) {
            m_puzzle->swapPieces(this, m_swap_piece);
            qSwap(m_position, m_swap_piece->m_position);
            m_swap_piece->setHighlight(false);
            m_swap_piece->setZValue(2);
            m_swap_piece->moveTo(m_swap_piece->m_position);
            m_swap_piece = 0;
      }
      moveTo(m_position);
      QGraphicsEllipseItem::mouseReleaseEvent(event);
}

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

void Piece::rotateConnectors() {
      float angle = m_gradient.angle();
      angle -= 20;
      if (angle < 0) {
            angle += 360;
      }
      m_gradient.setAngle(angle);
      setBrush(m_gradient);

      m_rotations--;
      if (m_rotations == 0) {
            m_rotate_timer->stop();
            actionFinished();
      }
}

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

void Piece::actionFinished() {
      setZValue(1);
      if (!m_puzzle->isDone()) {
            setFlag(ItemIsMovable, true);
      }
}

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

void Piece::moveTo(const QPointF& new_pos) {
      setFlag(ItemIsMovable, false);

      QTimeLine* timeline = new QTimeLine(200, this);

      QGraphicsItemAnimation* animation = new QGraphicsItemAnimation(this);
      animation->setItem(this);
      animation->setTimeLine(timeline);
      animation->setPosAt(0, pos());
      animation->setPosAt(1, new_pos);

      connect(timeline, SIGNAL(finished()), this, SLOT(actionFinished()));
      connect(timeline, SIGNAL(finished()), animation, SLOT(deleteLater()));
      connect(timeline, SIGNAL(finished()), timeline, SLOT(deleteLater()));
      timeline->start();
}

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

void Piece::rotate() {
      m_connectors.move(5, 0);
      m_rotations += 3;
      if (!m_rotate_timer->isActive()) {
            m_rotate_timer->start();
            setFlag(ItemIsMovable, false);
      }
}

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

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