GameTut/bullet.cpp

#include "bullet.h"
#include <QTimer>
#include <QGraphicsScene>
#include <QList>
#include "enemy.h"
#include "game.h"

extern Game* game;


Bullet::Bullet(QGraphicsItem *parent): QObject(), QGraphicsPixmapItem(parent){
    setPixmap(QPixmap(":/images/missile2.png"));
    show();
    QTimer* timer = new QTimer();
    connect(timer, SIGNAL(timeout()), this, SLOT(move()));
    timer->start(50);
}

void Bullet::move(){
    // if bullet collides with enemy, destroy both
    QList<QGraphicsItem *> colliding_items = collidingItems();
    for (int i = 0, n = colliding_items.size(); i < n; i++) {
        if (typeid(*(colliding_items[i])) == typeid(Enemy)) {
            game->score->increase();
            scene()->removeItem(colliding_items[i]);
            scene()->removeItem(this);
            delete colliding_items[i];
            delete this;
            return;
        }
    }
    this->setPos(x(), y()-10);
    if(pos().y() < 0) {
        scene()->removeItem(this);
        delete this;
        qDebug() << "bullet deleted";
    }
}