Mastering GUI Programming with Python

Collision detection

Bullets don't do much good if nothing happens when they hit the target. To make something happen when a bullet hits a tank, we need to implement collision detection. We will implement this in the Bullet class by asking it to check whether it has hit anything whenever it moves.

Start by creating a method in Bullet called check_colllision():

    def check_collision(self):        colliding_items = self.collidingItems()        if colliding_items:            self.scene().removeItem(self)            for item in colliding_items:                if type(item).__name__ == 'Tank':                    self.hit.emit()

QGraphicsObject.collidingItems() returns a list of any QGraphicsItem objects whose bounding rectangles overlap with this item. This includes not only our Tank objects, but also the floor and ...