Qt 4.8: view.h Example File (graphicsview/portedasteroids/view.h)

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# view.h Example File

graphicsview/portedasteroids/view.h

     /****************************************************************************
     **
     ** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     /*
      * KAsteroids - Copyright (c) Martin R. Jones 1997
      *
      * Part of the KDE project
      */

     #ifndef __AST_VIEW_H__
     #define __AST_VIEW_H__

     #include <QWidget>
     #include <QList>
     #include <QMultiHash>
     #include <QTimer>
     #include <QGraphicsScene>
     #include <QGraphicsView>
     #include <QTimerEvent>
     #include <QShowEvent>
     #include <QResizeEvent>
     #include "sprites.h"

     #define MAX_POWER_LEVEL          1000

     class KAsteroidsView : public QWidget
     {
         Q_OBJECT
     public:
         KAsteroidsView( QWidget *parent = 0);
         virtual ~KAsteroidsView();

         int refreshRate;

         void reset();
         void setRockSpeed( double rs ) { rockSpeed = rs; }
         void addRocks( int num );
         void newGame();
         void endGame();
         void newShip();

         void rotateLeft( bool r ) { rotateL = r; rotateSlow = 5; }
         void rotateRight( bool r ) { rotateR = r; rotateSlow = 5; }
         void thrust( bool t ) { thrustShip = t && shipPower > 0; }
         void shoot( bool s ) { shootShip = s; shootDelay = 0; }
         void setShield( bool s );
         void teleport( bool te) { teleportShip = te && mTeleportCount; }
         void brake( bool b );
         void pause( bool p);

         void showText( const QString &text, const QColor &color, bool scroll=TRUE );
         void hideText();

         int shots() const { return shotsFired; }
         int hits() const { return shotsHit; }
         int power() const { return shipPower; }

         int teleportCount() const { return mTeleportCount; }
         int brakeCount() const { return mBrakeCount; }
         int shieldCount() const { return mShieldCount; }
         int shootCount() const { return mShootCount; }

     signals:
         void shipKilled();
         void rockHit( int size );
         void rocksRemoved();
         void updateVitals();

     private slots:
         void hideShield();

     protected:
         bool readSprites();
         void wrapSprite( QGraphicsItem * );
         void rockHit( AnimatedPixmapItem * );
         void reducePower( int val );
         void addExhaust( double x, double y, double dx, double dy, int count );
         void processMissiles();
         void processShip();
         void processPowerups();
         void processShield();
         double randDouble();
         int randInt( int range );

         virtual void resizeEvent( QResizeEvent *event );
         virtual void timerEvent( QTimerEvent * );

         void showEvent( QShowEvent * );

     private:
         QGraphicsScene field;
         QGraphicsView view;
         QMap<int, QList<QPixmap> > animation;
         QList<AnimatedPixmapItem*> rocks;
         QList<KMissile*> missiles;
         QList<KBit*> bits;
         QList<KExhaust*> exhaust;
         QList<KPowerup*> powerups;
         KShield *shield;
         AnimatedPixmapItem *ship;
         QGraphicsTextItem *textSprite;

         bool rotateL;
         bool rotateR;
         bool thrustShip;
         bool shootShip;
         bool teleportShip;
         bool brakeShip;
         bool pauseShip;
         bool shieldOn;

         bool vitalsChanged;

         int  shipAngle;
         int  rotateSlow;
         int  rotateRate;
         int  shipPower;

         int shotsFired;
         int shotsHit;
         int shootDelay;

         int mBrakeCount;
         int mShieldCount;
         int mTeleportCount;
         int mShootCount;

         double shipDx;
         double shipDy;

         int  textDy;
         int  mFrameNum;
         bool mPaused;
         int  mTimerId;

         double rockSpeed;
         double powerupSpeed;

         bool can_destroy_powerups;

         QTimer *shieldTimer;
         bool initialized;
     };

     #endif