Mastering GUI Programming with Python

Creating the bullets

In this game, each tank will only be allowed one bullet on the screen at a time. This simplifies our game code, but also keeps the game relatively challenging.

To implement these bullets, we'll create another QGraphicsObject object called Bullet, which is animated to move along the y axis.

Let's start our Bullet class as follows:

class Bullet(qtw.QGraphicsObject):    hit = qtc.pyqtSignal()    def __init__(self, y_pos, up=True):        super().__init__()        self.up = up        self.y_pos = y_pos

The bullet class starts by defining a hit signal indicating that it has hit an enemy tank. The constructor takes a y_pos argument to define the starting point of the bullet, and a Boolean indicating whether the bullet is to travel up or down. These arguments ...