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  1. 8th May 2009, 02:13 #11
    dognzhe
    dognzhe is offline Novice
    Join Date
    May 2009
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    Qt4
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    Exclamation Re: graphics view slow

    Qt Code: 
    1. #include "Tank.h"
    2.  
    3. Tank::Tank(QObject *parent,QGraphicsScene *scene)
    4.   : QObject(parent), QGraphicsItem(0,scene)
    5. {
    6.   tankDirection=dRight;
    7.   tankUp = new QPixmap(":/CannonBattle/Resources/tank up.jpg");
    8.   tankDown= new QPixmap(":/CannonBattle/Resources/tank down.jpg");
    9.   tankRight =new QPixmap(":/CannonBattle/Resources/tank right.jpg");
    10.   tankLeft = new QPixmap(":/CannonBattle/Resources/tank left.jpg");
    11.   if(tankUp->isNull() && tankDown->isNull() && tankRight->isNull()){
    12.     emit error(QString("tank image load fails"));
    13.   }
    14.   /*
    15.   
    16.   label.setText("dongzhe adfasd fasdfsdafsadfasdfasd");
    17.   //label.setMovie(movie);
    18.  mo=this->scene()->addWidget(&label);
    19.  mo->setPos(50,50);
    20.  */
    21.  
    22.   this->setCacheMode(QGraphicsItem::DeviceCoordinateCache);
    23.  
    24. }
    25.  
    26. Tank::~Tank()
    27. {
    28.  
    29. }
    30.  
    31. QPixmap* Tank::getImage() const{
    32.  
    33.   if(tankDirection==dRight){
    34.     return tankRight;
    35.   }else if(tankDirection== dLeft){
    36.     return tankLeft;
    37.   }else if(tankDirection== dUp){
    38.     return tankUp;
    39.   }else{
    40.     return tankDown;
    41.   }
    42.  
    43. }
    44.  
    45. QRectF Tank::boundingRect() const{
    46.  
    47.   //increase the boudingRect to get rid of marks
    48.   return QRectF(getImage()->rect().x(),getImage()->rect().y(),getImage()->rect().width(),getImage()->rect().height()+2);
    49.   //return getImage()->rect();
    50. }
    51.  
    52. void Tank::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget){
    53.  
    54.   painter->drawPixmap(QPoint(0,0),*getImage());
    55.   //painter->drawImage(QPoint(0,0),QImage(":/CannonBattle/Resources/explose.gif"));
    56.  
    57.  
    58.  
    59. }
    60.  
    61.  
    62. int Tank::type() const {
    63.  
    64.   return TANK_TYPE;
    65. }
    66.  
    67. [/QTCLASS]
    68.  
    69.  
    70. here is move tank
    71.  
    72. [QTCLASS]
    73. void CannonField::tankMove(){
    74. #if _DEBUG
    75.   int a;
    76.   int b;
    77.   timeTemp.start();
    78.   //timeTemp =QTime::currentTime();
    79.  
    80. #endif
    81.  
    82.   QPointF oldPoint(mainTank->pos());
    83.   tankCurrentY = mainTank->pos().y();
    84.   tankCurrentX= mainTank->pos().x();
    85.   if(mainTank->tankDirection==mainTank->dUp){
    86.     mainTank->setPos(tankCurrentX, tankCurrentY-tankSpeed);
    87.   }
    88.  
    89.   if(mainTank->tankDirection==mainTank->dDown){
    90.     mainTank->setPos(tankCurrentX, tankCurrentY+tankSpeed);
    91.   }
    92.  
    93.   if(mainTank->tankDirection==mainTank->dLeft){
    94.     mainTank->setPos(tankCurrentX-tankSpeed,tankCurrentY);
    95.   }
    96.  
    97.   if(mainTank->tankDirection==mainTank->dRight){
    98.     mainTank->setPos(tankCurrentX+tankSpeed,tankCurrentY);
    99.   }
    100.  
    101.   tankCurrentY = mainTank->pos().y();
    102.   tankCurrentX= mainTank->pos().x();
    103.  
    104.  
    105.   if (tankCurrentX <0 || tankCurrentY<0 || tankCurrentX > (scene.width()-mainTank->boundingRect().width()) || tankCurrentY > (scene.height()-mainTank->boundingRect().height())) {
    106.     mainTank->setPos(oldPoint);
    107.   }
    108.  
    109.   QList<QGraphicsItem *> collisions = mainTank->collidingItems(Qt::IntersectsItemBoundingRect);
    110.   if(!collisions.isEmpty()){
    112.  
    113.     QListIterator<QGraphicsItem *> it(collisions);
    114.     while(it.hasNext()){
    115.       temp= it.next();
    116.       if(temp->type()==TARGET_TYPE){
    117.         mainTank->setPos(oldPoint);
    118.       }
    119.     }
    120.  
    121.   }
    122.  
    123.  
    124.   //graphicsView.centerOn(mainTank); 
    125.   graphicsView.ensureVisible(mainTank,graphicsView.rect().width()/3,graphicsView.rect().height()/3);
    126.   #if _DEBUG
    127.   //for(int i=0;i<1000000;i++)
    128.   //{i++;}
    129.   //b=QTime::currentTime().msecsTo(timeTemp);
    130.   a= timeTemp.elapsed();
    131.   qDebug("%d\n",a);
    132. #endif
    133. }
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    I don;'t know what to do ...
    Last edited by wysota; 8th May 2009 at 06:39.
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