Pygame:让事情比 1 慢 [英] Pygame: Making things move slower than 1
问题描述
我制作了一个类似 Space Invaders 的游戏,一切都很好,只是我觉得我编程的敌人移动得太快了.如果我将它们的移动速度设为 1 以下,例如 0.5,它们甚至不会移动.有什么办法可以让动作更慢吗?
I made a little Space Invaders like game, everything is good except that I feel like my enemies I programmed move too fast. If I make their movement speed under 1 such as 0.5, they won't even move. Is there a way I can make the movement even slower?
这是我的敌方单位的代码:
Here is the code for my enemy unit:
import math
WINDOW = pygame.display.set_mode((800, 900))
class Enemy (pygame.sprite.Sprite):
def __init__(self):
super(). __init__ ()
pygame.sprite.Sprite.__init__(self)
self.image = pygame.Surface((20,20))
self.image.fill((255,0,0))
pygame.draw.circle(self.image,(COLOUR4), (10,10),10)
self.rect=self.image.get_rect()
self.rect.center=(0,0)
self.dx=2
self.dy=1
def update(self):
self.rect.centery += self.dy
for i in range (100):
enemy = Enemy()
enemy.rect.x=random.randrange(750)
enemy.rect.y=random.randrange(100)
enemy_list.add(enemy)
all_sprites_list.add(enemy)
推荐答案
问题是 pygame.Rect
s 只能有整数,因为它们的坐标和浮点数被截断.如果您想要浮点值作为速度,您必须将实际位置存储为一个单独的属性(或两个,如下面的第一个示例),每帧添加速度,然后将新位置分配给矩形.
The problem is that pygame.Rect
s can only have ints as their coordinates and floats get truncated. If you want floating point values as the velocities, you have to store the actual position as a separate attribute (or two as in the first example below), add the velocity to it every frame and then assign the new position to the rect.
class Enemy(pygame.sprite.Sprite):
def __init__(self, pos): # You can pass the position as a tuple, list or vector.
super().__init__()
self.image = pygame.Surface((20, 20))
self.image.fill((255, 0, 0))
pygame.draw.circle(self.image, (COLOUR4), (10, 10), 10)
# The actual position of the sprite.
self.pos_x = pos[0]
self.pos_y = pos[1]
# The rect serves as the blit position and for collision detection.
# You can pass the center position as an argument.
self.rect = self.image.get_rect(center=(self.pos_x, self.pos_y))
self.dx = 2
self.dy = 1
def update(self):
self.pos_x += self.dx
self.pos_y += self.dy
self.rect.center = (self.pos_x, self.pos_y)
我建议使用 vectors,因为它们更加通用和简洁.
I recommend using vectors, since they are more versatile and concise.
from pygame.math import Vector2
class Enemy(pygame.sprite.Sprite):
def __init__(self, pos):
# ...
self.pos = Vector2(pos)
self.velocity = Vector2(2, 1)
def update(self):
self.pos += self.velocity
self.rect.center = self.pos
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