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Bullet.cpp

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#include "Bullet.h"

#include <QPixmap>

#include <QTimer>

#include <qmath.h> // qSin, qCos, qTan

Bullet::Bullet(QGraphicsItem *parent){

// set graphics

setPixmap(QPixmap(":images/arrow.png"));

// connect a timer to move()

QTimer * move_timer = new QTimer(this);

connect(move_timer,SIGNAL(timeout()),this,SLOT(move()));

move_timer->start(50);

}

void Bullet::move(){

int STEP_SIZE = 30;

double theta = rotation(); // degrees

double dy = STEP_SIZE * qSin(qDegreesToRadians(theta));

double dx = STEP_SIZE * qCos(qDegreesToRadians(theta));

setPos(x()+dx, y()+dy);

}