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view.h Example File
^{graphicsview/portedasteroids/view.h}

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

 #ifndef __AST_VIEW_H__
 #define __AST_VIEW_H__

 #include <qwidget.h>
 #include <q3ptrlist.h>
 #include <q3intdict.h>
 #include <qtimer.h>
 #include <QGraphicsScene>
 #include <QGraphicsView>
 //Added by qt3to4:
 #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, const char *name = 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;
     Q3PtrList<AnimatedPixmapItem> rocks;
     Q3PtrList<KMissile> missiles;
     Q3PtrList<KBit> bits;
     Q3PtrList<KExhaust> exhaust;
     Q3PtrList<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