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main.py
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"""# Asteroids #
## The classic game of asteroids implemented in [Pyxel](https://github.com/kitao/pyxel)! ##
Controls are **→** & **←** for turning, **↑** for acceleration and **space** for shooting!
**Q**: Quit the game
## Features: ##
1. Moving!
2. Shooting!
3. Enemies (asteroids)!
4. Sound effects!
5. High scores!
6. More?
## Installation ##
1. Install [Python 3](https://www.python.org)
2. Install [Pyxel](https://github.com/kitao/pyxel) using their instructions
3. Clone or copy this repository
4. `python3 main.py` at the command line (if on windows use `py main.py`).
"""
import pyxel
from asteroid import Asteroid
from bullet import Bullet
import collisions
import constants
from utils import center_text, get_highscore, save_highscore
from ship import Ship, ShipBreakup
import sound
class Game:
"""Manage the game state and various classes."""
def __init__(self):
"""Initialise pyxel and various classes and variables (one off)."""
pyxel.init(200, 200, display_scale=2)
self.ship = Ship(*constants.SHIP_INITIAL_POSITION, constants.SHIP_COLOUR)
Asteroid.init_class(self.ship)
sound.init_music()
self.reset_game()
self.high_score = get_highscore(constants.HIGH_SCORE_FILE)
pyxel.run(self.update, self.draw)
def reset_game(self):
"""Initialise start of game state (reset ship position, score, and asteroids)."""
self.ship.reset()
Asteroid.initiate_game()
self.death = False
self.spawn_speed = constants.INITIAL_SPAWN_FREQUENCY
self.next_spawn = pyxel.frame_count + self.spawn_speed
def update(self):
"""Update the game state, including the asteroids, ship and bullets."""
self.check_input()
Bullet.update_all()
Asteroid.update_all()
if not self.death:
self.ship.update_position()
self.check_spawn_asteroid()
self.check_collisions()
else:
self.ship_breakup.update()
def check_input(self):
"""Check for input and modify the game state accordingly."""
if not self.death:
if pyxel.btn(pyxel.KEY_UP):
if not self.ship.accelerating:
sound.start_accelerate()
self.ship.accelerate()
else:
if self.ship.accelerating:
sound.stop_accelerate()
self.ship.accelerating = False
if pyxel.btnp(pyxel.KEY_SPACE, 0, constants.BULLET_SHOOT_FREQUENCY):
self.ship.shoot()
if pyxel.btn(pyxel.KEY_SPACE):
self.ship.yes_shoot()
else:
self.ship.no_shoot()
if pyxel.btn(pyxel.KEY_LEFT):
self.ship.rotate("l")
elif pyxel.btn(pyxel.KEY_RIGHT):
self.ship.rotate("r")
elif pyxel.btnp(pyxel.KEY_R):
self.reset_game()
if pyxel.btnp(pyxel.KEY_Q) or pyxel.btnp(pyxel.KEY_ESCAPE):
pyxel.quit()
def check_collisions(self):
"""Check for collisions between the ship and asteroids, and the bullet and asteroids."""
if collisions.detect_ship_asteroid_collisions(self.ship, Asteroid):
self.death_event()
collisions.detect_bullet_asteroid_collisions(Bullet, Asteroid)
def death_event(self):
"""Modify game state for when the ship hits and asteroid."""
self.ship.destroy()
self.ship_breakup = ShipBreakup(self.ship)
self.death = True
sound.death()
if Asteroid.asteroid_score > self.high_score:
self.high_score = Asteroid.asteroid_score
save_highscore(constants.HIGH_SCORE_FILE, self.high_score)
def check_spawn_asteroid(self):
"""Keep track of the time and spawn new asteroids when appropriate.
Asteroids spawn on a reducing time scale (time decreases by a certain percentage each time."""
if pyxel.frame_count >= self.next_spawn:
Asteroid()
self.next_spawn += self.spawn_speed
self.spawn_speed *= constants.SPAWN_FREQUENCY_MOVEMENT
sound.spawn()
def draw(self):
"""Master method for drawing the board. Mainly calls the display methods of the various classes."""
background_colour = (
constants.BACKGROUND_COLOUR if not self.death else constants.DEATH_COLOUR
)
pyxel.cls(background_colour)
Bullet.display_all()
Asteroid.display_all()
if not self.death:
self.ship.display()
self.draw_score()
else:
self.ship_breakup.display()
self.draw_death()
def draw_score(self):
"""Draw the score and the high score at the top."""
score = "{:04}".format(Asteroid.asteroid_score)
high_score = "HS:{:04}".format(self.high_score)
high_score_x = pyxel.width - 2 - (7 * pyxel.FONT_WIDTH)
pyxel.text(3, 3, score, constants.SCORE_COLOUR)
pyxel.text(high_score_x, 3, high_score, constants.SCORE_COLOUR)
def draw_death(self):
"""Draw the display text for the end of the game with the score."""
display_text = ["YOU DIED"]
display_text.append("Your score is {:04}".format(Asteroid.asteroid_score))
if Asteroid.asteroid_score == self.high_score:
display_text.append("YOU HAVE A NEW HIGH SCORE!")
else:
display_text.append("The high score is {:04}".format(self.high_score))
display_text.append("(Q)uit or (R)estart")
text_area_height = len(display_text) * (pyxel.FONT_HEIGHT + 2) - 2
pyxel.rect(
x=0,
y=constants.DEATH_HEIGHT - 2,
w=pyxel.width,
h=text_area_height + 4,
col=constants.DEATH_STRIP_COLOUR,
)
for i, text in enumerate(display_text):
y_offset = (pyxel.FONT_HEIGHT + 2) * i
text_x = center_text(text, pyxel.width, pyxel.FONT_WIDTH)
pyxel.text(
text_x,
constants.DEATH_HEIGHT + y_offset,
text,
constants.DEATH_TEXT_COLOUR,
)
if __name__ == "__main__":
Game()