bullet.cpp

#include "bullet.h"
#include <math.h>
#include <typeinfo>

static const double Pi = 3.14159265358979323846264338327950288419717;
static double TwoPi = 2.0 * Pi;

static qreal normalizeAngle(qreal angle)
{
    while (angle < 0)
        angle += TwoPi;
    while (angle > TwoPi)
        angle -= TwoPi;
    return angle;
}

Bullet::Bullet(QPointF start, QPointF end, QGraphicsItem *hero, QObject *parent)
//    : QObject(parent), QGraphicsItem()
{
    this->hero = hero;
    this->setRotation(0);
    this->setPos(start);
    QLineF lineToTarget(start, end);
    qreal angleToTarget = ::acos(lineToTarget.dx() / lineToTarget.length());
    if (lineToTarget.dy() < 0)
        angleToTarget = TwoPi - angleToTarget;
    angleToTarget = normalizeAngle((Pi - angleToTarget) + Pi / 2);


    if (angleToTarget >= 0 && angleToTarget < Pi) {
        setRotation(rotation() - angleToTarget * 180 /Pi);
    } else if (angleToTarget <= TwoPi && angleToTarget > Pi) {
        setRotation(rotation() + (angleToTarget - TwoPi )* (-180) /Pi);
    }
    timerBullet = new QTimer();
    connect(timerBullet, &QTimer::timeout, this, &Bullet::slotTimerBullet);
    timerBullet->start((qgraphicsitem_cast <Target *> (this->hero))->getType() == TARGET ? 100 : 10);
    color = (qgraphicsitem_cast <Target *> (this->hero))->getType() == TARGET ? Qt::red : Qt::black;
}

Bullet::~Bullet()
{
    qDebug() << "Bullet destrucor was called";
    delete timerBullet;
}

QRectF Bullet::boundingRect() const
{
    return QRectF(0,0,2,4);
}

void Bullet::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    painter->setPen(color);
    painter->setBrush(color);
    painter->drawRect(0,0,2,4);

    Q_UNUSED(option);
    Q_UNUSED(widget);
}

void Bullet::slotTimerBullet()
{
    setPos(mapToParent(0, -10));
    QList<QGraphicsItem *> foundItems = scene()->items(QPolygonF()
                                                           << mapToScene(0, 0)
                                                           << mapToScene(-1, -1)
                                                           << mapToScene(1, -1));
    foreach (QGraphicsItem *item, foundItems) {
        if (item == this || item == hero || typeid(*this) == typeid(*item))
            continue;
        emit shotHit(item);
        this->deleteLater();
    }
    if(this->x() < 0){
        this->deleteLater();
    }
    if(this->x() > 500){
        this->deleteLater();
    }

    if(this->y() < 0){
        this->deleteLater();
    }
    if(this->y() >  500){
        this->deleteLater();
    }
}