因此，我在 pygame 中编写了一个小型平台游戏，您可以在其中放置块并在它们上面跳来跳去。但是，游戏仅限于窗口的边界（显然）。那么如何添加一种使用 A 和 D 键滚动“相机”的方法呢？
这是游戏的代码：
import pygame,random
from pygame.locals import *
from collections import namedtuple
pygame.init()
clock=pygame.time.Clock()
screen=pygame.display.set_mode((640,480))
pygame.display.set_caption("PiBlocks | By Sam Tubb")
max_gravity = 100
blocksel="texture\\dirt.png"
curs = pygame.image.load("texture\\cursor.png").convert()
curs.set_colorkey((0,255,0))
class Block(object):
def __init__(self,x,y,sprite):
self.sprite = pygame.image.load(sprite).convert_alpha()
self.rect = self.sprite.get_rect(centery=y, centerx=x)
class Player(object):
sprite = pygame.image.load("texture\\playr.png").convert()
sprite.set_colorkey((0,255,0))
def __init__(self, x, y):
self.rect = self.sprite.get_rect(centery=y, centerx=x)
# indicates that we are standing on the ground
# and thus are "allowed" to jump
self.on_ground = True
self.xvel = 0
self.yvel = 0
self.jump_speed = 7
self.move_speed = 3
def update(self, move, blocks):
# check if we can jump
if move.up and self.on_ground:
self.yvel -= self.jump_speed
# simple left/right movement
if move.left: self.xvel = -self.move_speed
if move.right: self.xvel = self.move_speed
# if in the air, fall down
if not self.on_ground:
self.yvel += 0.3
# but not too fast
if self.yvel > max_gravity: self.yvel = max_gravity
# if no left/right movement, x speed is 0, of course
if not (move.left or move.right):
self.xvel = 0
# move horizontal, and check for horizontal collisions
self.rect.left += self.xvel
self.collide(self.xvel, 0, blocks)
# move vertically, and check for vertical collisions
self.rect.top += self.yvel
self.on_ground = False;
self.collide(0, self.yvel, blocks)
def collide(self, xvel, yvel, blocks):
# all blocks that we collide with
for block in [blocks[i] for i in self.rect.collidelistall(blocks)]:
# if xvel is > 0, we know our right side bumped
# into the left side of a block etc.
if xvel > 0: self.rect.right = block.rect.left
if xvel < 0: self.rect.left = block.rect.right
# if yvel > 0, we are falling, so if a collision happpens
# we know we hit the ground (remember, we seperated checking for
# horizontal and vertical collision, so if yvel != 0, xvel is 0)
if yvel > 0:
self.rect.bottom = block.rect.top
self.on_ground = True
self.yvel = 0
# if yvel < 0 and a collision occurs, we bumped our head
# on a block above us
if yvel < 0: self.rect.top = block.rect.bottom
colliding = False
Move = namedtuple('Move', ['up', 'left', 'right'])
player=[]
blocklist=[]
font=pygame.font.Font(None,20)
while True:
screen.fill((25,30,90))
mse = pygame.mouse.get_pos()
key = pygame.key.get_pressed()
if key[K_1]:
blocksel="texture\\dirt.png"
if key[K_2]:
blocksel="texture\\stonetile.png"
if key[K_3]:
blocksel="texture\\sand.png"
if key[K_ESCAPE]:
exit()
for event in pygame.event.get():
if event.type == QUIT:
exit()
if key[K_LSHIFT]:
if event.type==MOUSEMOTION:
if not any(block.rect.collidepoint(mse) for block in blocklist):
x=(int(mse[0]) / 32)*32
y=(int(mse[1]) / 32)*32
blocklist.append(Block(x+16,y+16,blocksel))
else:
if event.type == pygame.MOUSEBUTTONUP:
if event.button == 1:
to_remove = [b for b in blocklist if b.rect.collidepoint(mse)]
for b in to_remove:
blocklist.remove(b)
if not to_remove:
x=(int(mse[0]) / 32)*32
y=(int(mse[1]) / 32)*32
blocklist.append(Block(x+16,y+16,blocksel))
elif event.button == 3:
x=(int(mse[0]) / 32)*32
y=(int(mse[1]) / 32)*32
player=Player(x+16,y+16)
move = Move(key[K_UP], key[K_LEFT], key[K_RIGHT])
for b in blocklist:
screen.blit(b.sprite, b.rect)
if player:
player.update(move, blocklist)
screen.blit(player.sprite, player.rect)
x=(int(mse[0]) / 32)*32
y=(int(mse[1]) / 32)*32
screen.blit(curs,(x,y))
clock.tick(60)
x=blocksel.replace('texture\\','')
x=x.replace('.png','')
words=font.render('Selected Block: '+str(x), True, (255,255,255))
screen.blit(words,(1,1))
pygame.display.flip()
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