Qt 5.6 | Qt Widgets | Sub-Attaq | bomb.cpp Example File

Qt 5.6.2 Reference Documentation

# bomb.cpp Example File

animation/sub-attaq/bomb.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the QtCore module of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:LGPL21$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see http://www.qt.io/terms-conditions. For further
      ** information use the contact form at http://www.qt.io/contact-us.
      **
      ** GNU Lesser General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU Lesser
      ** General Public License version 2.1 or version 3 as published by the Free
      ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
      ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
      ** following information to ensure the GNU Lesser General Public License
      ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
      ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
      **
      ** As a special exception, The Qt Company gives you certain additional
      ** rights. These rights are described in The Qt Company LGPL Exception
      ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      //Own
      #include "bomb.h"
      #include "submarine.h"
      #include "pixmapitem.h"
      #include "animationmanager.h"
      #include "qanimationstate.h"

      //Qt
      #include <QtCore/QSequentialAnimationGroup>
      #include <QtCore/QPropertyAnimation>
      #include <QtCore/QStateMachine>
      #include <QtCore/QFinalState>

      Bomb::Bomb() : PixmapItem(QString("bomb"), GraphicsScene::Big)
      {
          setZValue(2);
      }

      void Bomb::launch(Bomb::Direction direction)
      {
          QSequentialAnimationGroup *launchAnimation = new QSequentialAnimationGroup;
          AnimationManager::self()->registerAnimation(launchAnimation);
          qreal delta = direction == Right ? 20 : - 20;
          QPropertyAnimation *anim = new QPropertyAnimation(this, "pos");
          anim->setEndValue(QPointF(x() + delta,y() - 20));
          anim->setDuration(150);
          launchAnimation->addAnimation(anim);
          anim = new QPropertyAnimation(this, "pos");
          anim->setEndValue(QPointF(x() + delta*2, y() ));
          anim->setDuration(150);
          launchAnimation->addAnimation(anim);
          anim = new QPropertyAnimation(this, "pos");
          anim->setEndValue(QPointF(x() + delta*2,scene()->height()));
          anim->setDuration(y()/2*60);
          launchAnimation->addAnimation(anim);
          connect(anim,SIGNAL(valueChanged(QVariant)),this,SLOT(onAnimationLaunchValueChanged(QVariant)));
          connect(this, SIGNAL(bombExploded()), launchAnimation, SLOT(stop()));
          //We setup the state machine of the bomb
          QStateMachine *machine = new QStateMachine(this);

          //This state is when the launch animation is playing
          QAnimationState *launched = new QAnimationState(machine);
          launched->setAnimation(launchAnimation);

          //End
          QFinalState *final = new QFinalState(machine);

          machine->setInitialState(launched);

          //### Add a nice animation when the bomb is destroyed
          launched->addTransition(this, SIGNAL(bombExploded()),final);

          //If the animation is finished, then we move to the final state
          launched->addTransition(launched, SIGNAL(animationFinished()), final);

          //The machine has finished to be executed, then the boat is dead
          connect(machine,SIGNAL(finished()),this, SIGNAL(bombExecutionFinished()));

          machine->start();

      }

      void Bomb::onAnimationLaunchValueChanged(const QVariant &)
      {
          foreach (QGraphicsItem * item , collidingItems(Qt::IntersectsItemBoundingRect)) {
              if (item->type() == SubMarine::Type) {
                  SubMarine *s = static_cast<SubMarine *>(item);
                  destroy();
                  s->destroy();
              }
          }
      }

      void Bomb::destroy()
      {
          emit bombExploded();
      }