我正在制作一个小行星克隆，我无法确定在哪里存储玩家精灵的移动角度以及如何让子弹访问（如果这有意义）。现在，我认为我的船的旋转存储在angle_speed变量中，我用它来生成子弹的dest_x和dest_y（目标x和y）坐标。然而子弹继续射击（0,0）。有人可以帮忙吗？
try:
import sys
import math
import os
import getopt
import pygame
from pygame.locals import *
from pygame.math import Vector2
except ImportError, err:
print "couldn't load module. %s" % (err)
sys.exit(2)
# these are warnings if font or sound modules are not available.
if not pygame.font: print 'Warning, fonts disabled'
if not pygame.mixer: print 'Warning, sound disabled'
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
RED = (255, 0, 0)
BLUE = (0, 0, 255)
class Player(pygame.sprite.Sprite):
"""moves ship on screen"""
def __init__(self, pos=(420,420)):
super(Player, self).__init__() # call Sprite initializer
self.image = pygame.Surface([20, 20])
self.image.fill(RED)
self.original_image = self.image
self.rect = self.image.get_rect(center=pos)
self.position = Vector2(pos)
self.direction = Vector2(0,1)
self.speed = 0
self.angle_speed = 0
self.angle = 0
def update(self):
if self.angle_speed != 0:
# Rotate the direction vector and then the image
self.direction.rotate_ip(self.angle_speed)
self.angle += self.angle_speed
self.image = pygame.transform.rotate(self.original_image, -self.angle)
self.rect = self.image.get_rect(midtop=self.rect.midtop)
# Update the position vector and the rect.
self.position += self.direction * self.speed
self.rect.center = self.position
class Bullet(pygame.sprite.Sprite):
""" This class represents the bullet. """
def __init__(self, start_x, start_y, dest_x, dest_y):
""" Constructor.
It takes in the starting x and y location.
It also takes in the destination x and y position.
"""
# Call the parent class (Sprite) constructor
super(Bullet, self).__init__()
# Set up the image for the bullet
self.image = pygame.Surface([4, 10])
self.image.fill(BLACK)
self.rect = self.image.get_rect()
# Move the bullet to our starting location
self.rect.x = start_x
self.rect.y = start_y
# Because rect.x and rect.y are automatically converted
# to integers, we need to create different variables that
# store the location as floating point numbers. Integers
# are not accurate enough for aiming.
self.floating_point_x = start_x
self.floating_point_y = start_y
# Calculation the angle in radians between the start points
# and end points. This is the angle the bullet will travel.
x_diff = dest_x - start_x
y_diff = dest_y - start_y
angle = math.atan2(y_diff, x_diff);
# Taking into account the angle, calculate our change_x
# and change_y. Velocity is how fast the bullet travels.
velocity = 11
self.change_x = math.cos(angle) * velocity
self.change_y = math.sin(angle) * velocity
def update(self):
""" Move the bullet. """
# The floating point x and y hold our more accurate location.
self.floating_point_y += self.change_y
self.floating_point_x += self.change_x
# The rect.x and rect.y are converted to integers.
self.rect.y = int(self.floating_point_y)
self.rect.x = int(self.floating_point_x)
# If the bullet flies of the screen, get rid of it.
if self.rect.x < 0 or self.rect.x > SCREEN_WIDTH or self.rect.y < 0 or self.rect.y > SCREEN_HEIGHT:
self.kill()
def main():
pygame.init()
pygame.mixer.init()
pygame.key.set_repeat(500,30)
screen = pygame.display.set_mode([SCREEN_WIDTH, SCREEN_HEIGHT])
pygame.display.set_caption('Asteroids')
screen_rect = screen.get_rect()
all_sprites_list = pygame.sprite.Group()
# List of each bullet
bullet_list = pygame.sprite.Group()
bullets = []
player = Player()
all_sprites_list.add(player)
MAXSPEED = 15
MINSPEED = -5
clock = pygame.time.Clock()
done = False
while not done:
clock.tick(60)
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
elif event.type == pygame.KEYDOWN:
if event.key == pygame.K_UP and player.speed > MINSPEED:
player.speed -= 3
if event.key == pygame.K_DOWN and player.speed < MAXSPEED:
player.speed += 3
if event.key == pygame.K_LEFT:
player.angle_speed = -3
if event.key == pygame.K_RIGHT:
player.angle_speed = 3
if event.key == pygame.K_SPACE:
dest_x = math.sin(player.angle_speed)
dest_y = math.cos(player.angle_speed)
# Create the bullet based on where we are, and where we want to go.
bullet = Bullet(player.rect.x, player.rect.y, dest_x, dest_y)
# Add the bullet to the lists
all_sprites_list.add(bullet)
bullet_list.add(bullet)
elif event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT:
player.angle_speed = 0
elif event.key == pygame.K_RIGHT:
player.angle_speed = 0
all_sprites_list.update()
player.rect.clamp_ip(screen_rect)
screen.fill((255, 255, 255))
# screen.blit(player.image, player.rect)
all_sprites_list.draw(screen)
pygame.display.flip()
if __name__ == '__main__':
main()
pygame.quit()
答案 0 :(得分：1)
角度存储在player精灵的angle_speed属性中。 angle只是它旋转的速度。
没有必要计算子弹的角度和速度，因为你可以传递玩家精灵的direction和import math
import pygame
from pygame.math import Vector2
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
RED = (255, 0, 0)
class Player(pygame.sprite.Sprite):
def __init__(self, pos=(420, 420)):
super(Player, self).__init__()
self.image = pygame.Surface([20, 40], pygame.SRCALPHA)
self.image.fill(RED)
self.original_image = self.image
self.rect = self.image.get_rect(center=pos)
self.position = Vector2(pos)
# The vector points upwards.
self.direction = Vector2(0, -1)
self.speed = 0
self.angle_speed = 0
self.angle = 0
def update(self):
if self.angle_speed != 0:
# Rotate the direction vector and then the image
self.direction.rotate_ip(self.angle_speed)
self.angle += self.angle_speed
self.image = pygame.transform.rotate(self.original_image, -self.angle)
self.rect = self.image.get_rect(midtop=self.rect.midtop)
# Update the position vector and the rect.
self.position += self.direction * self.speed
self.rect.center = self.position
class Bullet(pygame.sprite.Sprite):
""" This class represents the bullet. """
def __init__(self, pos, direction, angle):
"""Take the pos, direction and angle of the player."""
super(Bullet, self).__init__()
self.image = pygame.Surface([4, 10], pygame.SRCALPHA)
self.image.fill(BLACK)
# Rotate the image by the player.angle (negative since y-axis is flipped).
self.image = pygame.transform.rotozoom(self.image, -angle, 1)
# Pass the center of the player as the center of the bullet.rect.
self.rect = self.image.get_rect(center=pos)
self.position = Vector2(pos) # The position vector.
self.velocity = direction * 11 # Multiply by desired speed.
def update(self):
"""Move the bullet."""
self.position += self.velocity # Update the position vector.
self.rect.center = self.position # And the rect.
if self.rect.x < 0 or self.rect.x > SCREEN_WIDTH or self.rect.y < 0 or self.rect.y > SCREEN_HEIGHT:
self.kill()
def main():
pygame.init()
pygame.key.set_repeat(500,30)
screen = pygame.display.set_mode([SCREEN_WIDTH, SCREEN_HEIGHT])
screen_rect = screen.get_rect()
all_sprites_list = pygame.sprite.Group()
bullet_group = pygame.sprite.Group() # "group" not "list".
player = Player()
all_sprites_list.add(player)
MAXSPEED = 15
MINSPEED = -5
clock = pygame.time.Clock()
done = False
while not done:
clock.tick(60)
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True
elif event.type == pygame.KEYDOWN:
if event.key == pygame.K_UP and player.speed > MINSPEED:
player.speed += 3
if event.key == pygame.K_DOWN and player.speed < MAXSPEED:
player.speed -= 3
if event.key == pygame.K_LEFT:
player.angle_speed = -3
if event.key == pygame.K_RIGHT:
player.angle_speed = 3
if event.key == pygame.K_SPACE:
# Just pass the rect.center, direction vector and angle.
bullet = Bullet(
player.rect.center, player.direction, player.angle)
all_sprites_list.add(bullet)
bullet_group.add(bullet)
elif event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT:
player.angle_speed = 0
elif event.key == pygame.K_RIGHT:
player.angle_speed = 0
all_sprites_list.update()
player.rect.clamp_ip(screen_rect)
screen.fill(WHITE)
all_sprites_list.draw(screen)
pygame.display.flip()
if __name__ == '__main__':
main()
pygame.quit()
。
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