如何解决在pygame中停止绘图时如何继续使用蛇头?
我有一条正在画线的蛇,并且随机正在打洞,但是如何在蛇不画线(打洞)的情况下继续头部。这是我的代码:
import pygame
pygame.init()
import random
from random import randint
win = pygame.display.set_mode((1280,720))
background = pygame.Surface(win.get_size(),pygame.SRCALPHA)
background.fill((0,1))
x = randint(150,1130)
y = randint(150,570)
vel = 0.6
direction = pygame.math.Vector2(vel,0).rotate(random.randint(0,360))
next_change_time = 0
draw_snake = False
clock = pygame.time.Clock()
run = True
while run:
clock.tick(150)
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
current_time = pygame.time.get_ticks()
if current_time > next_change_time:
draw_snake = not draw_snake
if draw_snake:
next_change_time = current_time + random.randint(2000,5000)
else:
next_change_time = current_time + random.randint(200,500)
keys = pygame.key.get_pressed()
if keys[pygame.K_LEFT]:
direction.rotate_ip(-0.8)
if keys[pygame.K_RIGHT]:
direction.rotate_ip(0.8)
x += direction.x
y += direction.y
if draw_snake:
pygame.draw.circle(win,(255,0),(round(x),round(y)),4)
pygame.display.update()
pygame.quit()
当我在 while 循环中写入 win.fill((0,0))
时,只有头部移动,但我想让头部仅在孔中移动。
解决方法
如果需要绘制身体,则需要将蛇头的位置添加到列表中。清除每一帧中的显示,但绘制保存在列表中的所有项目。另外,画蛇的头:
snake_list = []
while run:
# [...]
x += direction.x
y += direction.y
if draw_snake:
snake_list.append((x,y))
win.fill((0,0))
for pos in snake_list:
pygame.draw.circle(win,(255,0),(round(pos[0]),round(pos[1])),4)
pygame.draw.circle(win,(round(x),round(y)),4)
pygame.display.update()
完整示例:
pygame.init()
import random
from random import randint
win = pygame.display.set_mode((1280,720))
background = pygame.Surface(win.get_size(),pygame.SRCALPHA)
background.fill((0,1))
x = randint(150,1130)
y = randint(150,570)
vel = 0.6
direction = pygame.math.Vector2(vel,0).rotate(random.randint(0,360))
next_change_time = 0
draw_snake = False
snake_list = []
clock = pygame.time.Clock()
run = True
while run:
clock.tick(150)
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
current_time = pygame.time.get_ticks()
if current_time > next_change_time:
draw_snake = not draw_snake
if draw_snake:
next_change_time = current_time + random.randint(2000,5000)
else:
next_change_time = current_time + random.randint(200,500)
keys = pygame.key.get_pressed()
if keys[pygame.K_LEFT]:
direction.rotate_ip(-0.8)
if keys[pygame.K_RIGHT]:
direction.rotate_ip(0.8)
x += direction.x
y += direction.y
if draw_snake:
snake_list.append((x,4)
pygame.display.update()
pygame.quit()
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