I am currently writing a brickbreaker game in python to teach myself classes and such however I am unable to get the ball to show up. I have the bricks and the paddle, the paddle is moving but not seeing the ball. Any idea why?
import tkinter as tk
class GameObject(object):
def __init__(self, canvas, item):
self.canvas = canvas
self.item = item
def get_position(self):
return self.canvas.coords(self.item)
def move(self, x, y):
self.canvas.move(self.item, x, y)
def delete(self):
self.canvas.delete(self.item)
class Ball(GameObject):
def __init__(self, canvas, x, y):
self.radius = 10
self.direction = [1, -1]
# increase the below value to increase the speed of ball
self.speed = 5
item = canvas.create_oval(x-self.radius, y-self.radius,
x+self.radius, y+self.radius,
fill='white')
super(Ball, self).__init__(canvas, item)
def update(self):
coords = self.get_position()
width = self.canvas.winfo_width()
if coords[0] <= 0 or coords[2] >= width:
self.direction[0] *= -1
if coords[1] <= 0:
self.direction[1] *= -1
x = self.direction[0] * self.speed
y = self.direction[1] * self.speed
self.move(x, y)
def collide(self, game_objects):
coords = self.get_position()
x = (coords[0] + coords[2]) * 0.5
if len(game_objects) > 1:
self.direction[1] *= -1
elif len(game_objects) == 1:
game_object = game_objects[0]
coords = game_object.get_position()
if x > coords[2]:
self.direction[0] = 1
elif x < coords[0]:
self.direction[0] = -1
else:
self.direction[1] *= -1
for game_object in game_objects:
if isinstance(game_object, Brick):
game_object.hit()
class Paddle(GameObject):
def __init__(self, canvas, x, y):
self.width = 80
self.height = 10
self.ball = None
item = canvas.create_rectangle(x - self.width / 2,
y - self.height / 2,
x + self.width / 2,
y + self.height / 2,
fill='#FFB643')
super(Paddle, self).__init__(canvas, item)
def set_ball(self, ball):
self.ball = ball
def move(self, offset):
coords = self.get_position()
width = self.canvas.winfo_width()
if coords[0] + offset >= 0 and coords[2] + offset <= width:
super(Paddle, self).move(offset, 0)
if self.ball is not None:
self.ball.move(offset, 0)
class Brick(GameObject):
COLORS = {1: '#4535AA', 2: '#ED639E', 3: '#8FE1A2'}
def __init__(self, canvas, x, y, hits):
self.width = 75
self.height = 20
self.hits = hits
color = Brick.COLORS[hits]
item = canvas.create_rectangle(x - self.width / 2,
y - self.height / 2,
x + self.width / 2,
y + self.height / 2,
fill=color, tags='brick')
super(Brick, self).__init__(canvas, item)
def hit(self):
self.hits -= 1
if self.hits == 0:
self.delete()
else:
self.canvas.itemconfig(self.item,
fill=Brick.COLORS[self.hits])
class Game(tk.Frame):
def __init__(self, master):
super(Game, self).__init__(master)
self.lives = 3
self.width = 610
self.height = 400
self.canvas = tk.Canvas(self, bg='#D6D1F5',
width=self.width,
height=self.height,)
self.canvas.pack()
self.pack()
self.items = {}
self.ball = None
self.paddle = Paddle(self.canvas, self.width/2, 326)
self.items[self.paddle.item] = self.paddle
# adding brick with different hit capacities - 3,2 and 1
for x in range(5, self.width - 5, 75):
self.add_brick(x + 37.5, 50, 3)
self.add_brick(x + 37.5, 70, 2)
self.add_brick(x + 37.5, 90, 1)
self.hud = None
self.canvas.focus_set()
self.canvas.bind('<Left>',
lambda _: self.paddle.move(-10))
self.canvas.bind('<Right>',
lambda _: self.paddle.move(10))
def add_ball(self):
if self.ball is not None:
self.ball.delete()
paddle_coords = self.paddle.get_position()
x = (paddle_coords[0] + paddle_coords[2]) * 0.5
self.ball = Ball(self.canvas, x, 310)
self.paddle.set_ball(self.ball)
def add_brick(self, x, y, hits):
brick = Brick(self.canvas, x, y, hits)
self.items[brick.item] = brick
def start_game(self):
self.canvas.unbind('<space>')
self.canvas.delete(self.text)
self.paddle.ball = None
self.game_loop()
def game_loop(self):
self.check_collisions()
num_bricks = len(self.canvas.find_withtag('brick'))
if num_bricks == 0:
self.ball.speed = None
else:
self.ball.update()
self.after(50, self.game_loop)
def check_collisions(self):
ball_coords = self.ball.get_position()
items = self.canvas.find_overlapping(*ball_coords)
objects = [self.items[x] for x in items if x in self.items]
self.ball.collide(objects)
if __name__ == '__main__':
root = tk.Tk()
root.title('Break those Bricks!')
game = Game(root)
game.mainloop()