Sections Demo 2
sections_demo_2.py
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Section Example 2:
In this Section example we develop a very basic Pong game playable by two
persons in the same computer (hot seat!).
Each Player is abstracted as a Section that consists of a space in the screen
where the player paddle can move.
Note:
- Sections can live along with Views. Sections do not need to occupy 100%
of the screen.
- View methods can interact with Sections by storing a reference to each
one.
- How keyboard events can be redirected to each section depending on the
pressed key automatically.
"""
import random
from arcade import Window, Section, View, SpriteList, SpriteSolidColor, \
SpriteCircle, draw_text, draw_line
from arcade.color import BLACK, BLUE, RED, BEAU_BLUE, GRAY
from arcade.key import W, S, UP, DOWN
PLAYER_SECTION_WIDTH = 100
PLAYER_PADDLE_SPEED = 10
class Player(Section):
"""
A Section representing the space in the screen where the player
paddle can move
"""
def __init__(self, left: int, bottom: int, width: int, height: int,
key_up: int, key_down: int, **kwargs):
super().__init__(left, bottom, width, height,
accept_keyboard_events={key_up, key_down}, **kwargs)
# keys assigned to move the paddle
self.key_up: int = key_up
self.key_down: int = key_down
# the player paddle
self.paddle: SpriteSolidColor = SpriteSolidColor(30, 100, BLACK)
# player score
self.score: int = 0
def setup(self):
# reset the player paddle position to the middle of the screen
self.paddle.position = self.left + 50, self.height / 2
def on_update(self, delta_time: float):
# update the paddle position
self.paddle.update()
def on_draw(self):
# draw sections info and score
if self.name == 'Left':
keys = 'W and S'
start_x = self.left + 5
else:
keys = 'UP and DOWN'
start_x = self.left - 290
draw_text(f'Player {self.name} (move paddle with: {keys})',
start_x, self.top - 20, BLUE, 9)
draw_text(f'Score: {self.score}', self.left + 20,
self.bottom + 20, BLUE)
# draw the paddle
self.paddle.draw()
def on_key_press(self, symbol: int, modifiers: int):
# set the paddle direction and movement speed
if symbol == self.key_up:
self.paddle.change_y = PLAYER_PADDLE_SPEED
else:
self.paddle.change_y = -PLAYER_PADDLE_SPEED
def on_key_release(self, _symbol: int, _modifiers: int):
# stop moving the paddle
self.paddle.stop()
class Pong(View):
def __init__(self):
super().__init__()
# a sprite list that will hold each player paddle to
# check for collisions
self.paddles: SpriteList = SpriteList()
# we store each Section
self.left_player: Player = Player(
0, 0, PLAYER_SECTION_WIDTH, self.window.height, key_up=W,
key_down=S, name='Left')
self.right_player: Player = Player(
self.window.width - PLAYER_SECTION_WIDTH, 0, PLAYER_SECTION_WIDTH,
self.window.height, key_up=UP, key_down=DOWN, name='Right')
# add the sections to the SectionManager so Sections start to work
self.add_section(self.left_player)
self.add_section(self.right_player)
# add each paddle to the sprite list
self.paddles.append(self.left_player.paddle)
self.paddles.append(self.right_player.paddle)
# create the ball
self.ball: SpriteCircle = SpriteCircle(20, RED)
def setup(self):
# set up a new game
# set ball position in the middle
self.ball.position = self.window.width / 2, self.window.height / 2
# randomize ball direction and speed
self.ball.change_x = random.choice([-3, -2, 3, 2])
self.ball.change_y = random.choice([-3, -2, 3, 2])
# setup player paddles
self.left_player.setup()
self.right_player.setup()
def on_update(self, delta_time: float):
self.ball.update() # update the ball
# bounce the ball either at the top or at the bottom
if self.ball.bottom <= 0:
self.ball.change_y *= -1
elif self.ball.top >= self.window.height:
self.ball.change_y *= -1
# check if the ball has collided with a paddle
collided_paddle = self.ball.collides_with_list(self.paddles)
if collided_paddle:
# adjust ball coordinates to simplify the game
if collided_paddle[0] is self.left_player.paddle:
self.ball.left = self.left_player.paddle.right
else:
self.ball.right = self.right_player.paddle.left
# bounce the ball from the paddle
self.ball.change_x *= -1
# check if the ball has exited the screen in either side and
# end the game
if self.ball.right <= 0:
self.end_game(self.right_player)
elif self.ball.left >= self.window.width:
self.end_game(self.left_player)
def end_game(self, winner: Player):
""" Called when one player wins """
winner.score += 1 # increment the winner score
self.setup() # prepare a new game
def on_draw(self):
self.clear(BEAU_BLUE) # clear the screen
self.ball.draw() # draw the ball
half_window_x = self.window.width / 2 # middle x
# draw a line diving the screen in half
draw_line(half_window_x, 0, half_window_x, self.window.height, GRAY, 2)
def main():
# create the window
window = Window(title='Two player simple Pong with Sections!')
# create the custom View
game = Pong()
# set up the game (start a game)
game.setup()
# show the view
window.show_view(game)
# run arcade loop
window.run()
if __name__ == '__main__':
main()
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