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python - 使用 Pygame 自行移动对象

问题描述

我正在尝试使用 Pygame 使圆圈从屏幕中间移动到顶部，然后回到中间，依此类推。

import pygame
import sys
pygame.init()

gameOver = False
speed = 5
clock = pygame.time.Clock()
fps = 20

class Screen:
    largeur = 600
    hauteur = 600
    demiLargeur = int(largeur/2)
    demiHauteur = int(hauteur/2)

screen = pygame.display.set_mode((Screen.largeur, Screen.hauteur))

class Couleurs:
    bleu  = (000,000,255)
    noir  = (000,000,000)

class Cercle:
    diametre = 50
    epaisseur = 5
    posTop = [Screen.demiLargeur, Screen.demiHauteur-2*diametre]

class CirclePos:
    top   = [Cercle.posTop[0],Cercle.posTop[1]] 

circleListTop = [CirclePos.top]


class DrawCircles:
    def top (circleListTop):
        for CirclePos.top in circleListTop:
            pygame.draw.circle(screen, Couleurs.bleu, (CirclePos.top[0],CirclePos.top[1]),Cercle.diametre,Cercle.epaisseur)

class UpdateCirclesPositions:
    def top(circleListTop):
        for idx,CirclePos.top in enumerate(circleListTop):
            if CirclePos.top[1] > Cercle.diametre :
                CirclePos.top[1] -= speed
            else:
                circleListTop.pop(idx)

while not gameOver:

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()

    screen.fill(Couleurs.noir)
    clock.tick(fps)

    DrawCircles.top(circleListTop)
    UpdateCirclesPositions.top(circleListTop)

    pygame.display.update()

到目前为止，我有这个代码，想法是让它向上移动，让它消失，然后创建另一个列表来将圆圈从顶部移动到中间。我觉得这是个坏主意。

任何想法 ？

谢谢

标签： python

解决方案

至于我，你的课太多了。在类 Circle 你应该有它的属性和方法update和draw.

当圆圈在顶部时，它应该改变速度 - speed = -speed。中间的时候也是一样。这样它就可以一直移动。但是它可能需要变量direction来检查它是否已经改变了方向，因为它可以一直在改变速度的地方（在每一次移动中）。

import pygame

# --- constans ---

SCREEN_WIDTH  = 600
SCREEN_HEIGHT = 600
FPS = 20
SPEED = 5

# --- classes ---

class Colors:
    blue  = (000, 000, 255)
    black = (000, 000, 000)
    red   = (255, 000, 000)

class Circle:

    def __init__(self, x, y, size=50, thick=5, color=Colors.blue, speed=SPEED):

        self.size = size
        self.thick = thick
        self.color = color

        self.rect = pygame.Rect(0, 0, 2*size, 2*size)
        self.rect.centerx = x
        self.rect.centery = y
        if speed >= 0:
            self.direction = 'up'
        else:
            self.direction = 'down'

        self.speed = speed

    def draw(self, screen):
        pygame.draw.circle(screen, self.color, self.rect.center, self.size, self.thick)

    def update(self):
        self.rect.y -= self.speed

        if self.rect.top <= 0 and self.direction == 'up':
            self.direction = 'down'
            self.speed = -self.speed

        if self.rect.bottom >= screen_rect.centery and self.direction == 'down':
            self.direction = 'up'
            self.speed = -self.speed

# --- main ---

pygame.init()

screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
screen_rect = screen.get_rect()

circles = [
    Circle(screen_rect.centerx, screen_rect.centery),
    Circle(screen_rect.centerx, 0, speed=-SPEED, color=Colors.red)
]

clock = pygame.time.Clock()

game_over = False

while not game_over:

    # --- events ----

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            game_over = True

    # --- updates --- (without draws)    

    for item in circles:
        item.update()

    # --- draws --- (without updates)

    screen.fill(Colors.black)

    for item in circles:
        item.draw(screen)

    pygame.display.update()

    clock.tick(FPS)


pygame.quit() # close window

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