34 lines
1.1 KiB
Python
34 lines
1.1 KiB
Python
import pygame
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from pygame.sprite import Sprite
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class Bullet(Sprite):
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"""A class to manage bullets fired from the ship."""
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def __init__(self, ai_settings, screen, ship):
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"""Create a bullet object, at the ship's current position."""
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super(Bullet, self).__init__()
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self.screen = screen
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# Create bullet rect at (0, 0), then set correct position.
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self.rect = pygame.Rect(0, 0, ai_settings.bullet_width,
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ai_settings.bullet_height)
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self.rect.centerx = ship.rect.centerx
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self.rect.top = ship.rect.top
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# Store a decimal value for the bullet's position.
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self.y = float(self.rect.y)
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self.color = ai_settings.bullet_color
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self.speed_factor = ai_settings.bullet_speed_factor
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def update(self):
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"""Move the bullet up the screen."""
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# Update the decimal position of the bullet.
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self.y -= self.speed_factor
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# Update the rect position.
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self.rect.y = self.y
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def draw_bullet(self):
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"""Draw the bullet to the screen."""
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pygame.draw.rect(self.screen, self.color, self.rect)
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