我创建了一个2人坦克战游戏，但是坦克的命中盒似乎有点不可靠。有时，当子弹发射时，子弹会击中坦克旁边的空白处并算作一次命中，但有时它会直接穿过坦克。
这是将Pygame用于Python 3.6.3。该程序是Jonathon Harbor的“更多Python绝对初学者的编程”（第12章）中所示程序的修改。我不完全了解原始创建者如何定义点击框，这使得修复该问题变得困难。由于我不确定错误在哪里，因此将整个程序包括在内。但是，我认为“子弹”类或“坦克”类中的def Draw可能是最好的外观（不过我很容易错了）。
# 2-Player Tank Battle Game
import sys, time, random, math, pygame
from pygame.locals import *
from My_Library import *
class Bullet():
def __init__(self, position):
self.alive = True
self.color = (250, 20, 20)
self.position = Point(position.x, position.y)
self.velocity = Point(0, 0)
self.rect = Rect(0, 0, 4, 4)
self.owner = ""
def update(self, ticks):
self.position.x -= self.velocity.x * 10.0
self.position.y -= self.velocity.y * 10.0
if self.position.x < 0 or self.position.x > 800 \
or self.position.y < 0 or self.position.y > 600:
self.alive = False
self.rect = Rect(self.position.x, self.position.y, 4, 4)
def draw(self, surface):
pos = (int(self.position.x), int(self.position.y))
pygame.draw.circle(surface, self.color, pos, 4, 0)
def fire_cannon(tank):
position = Point(tank.turret.X, tank.turret.Y)
bullet = Bullet(position)
angle = tank.turret.rotation + 90
bullet.velocity = angular_velocity(angle)
bullets.append(bullet)
play_sound(shoot_sound)
return bullet
def player_fire_cannon():
bullet = fire_cannon(player)
bullet.owner = "player"
bullet.color = (30, 250, 30)
def player2_fire_cannon():
bullet = fire_cannon(player2)
bullet.owner = "player2"
bullet.color = (250, 30, 30)
class Tank(MySprite):
def __init__(self, tank_file, turret_file):
MySprite.__init__(self)
self.load(tank_file, 50, 60, 4)
self.speed = 0.0
self.scratch = None
self.float_pos = Point(0, 0)
self.velocity = Point(0, 0)
self.turret = MySprite()
self.turret = MySprite()
self.turret.load(turret_file, 32, 64, 4)
self.fire_timer = 0
def update(self,ticks):
# update chassis
MySprite.update(self, ticks, 100)
self.rotation = wrap_angle(self.rotation)
self.scratch = pygame.transform.rotate(self.image, -self.rotation)
angle = wrap_angle(self.rotation-90)
self.velocity = angular_velocity(angle)
self.float_pos.x += self.velocity.x * 2
self.float_pos.y += self.velocity.y * 2
# warp tank around screen edges (keep it simple)
if self.float_pos.x < -50: self.float_pos.x = 800
elif self.float_pos.x > 800: self.float_pos.x = -50
if self.float_pos.y < -60: self.float_pos.y = 600
elif self.float_pos.y > 600: self.float_pos.y = -60
# transfer float position to integer position for drawing
self.X = int(self.float_pos.x)
self.Y = int(self.float_pos.y)
# update turret
self.turret.position = (self.X, self.Y)
self.turret.last_frame = 0
self.turret.update(ticks, 100)
self.turret.rotation = wrap_angle(self.turret.rotation)
angle = wrap_angle(self.turret.rotation)
self.turret.scratch = pygame.transform.rotate(self.turret.image, -angle)
def draw(self, surface):
# draw the chassis
width, height = self.scratch.get_size()
center = Point(width/2, height/2)
surface.blit(self.scratch, (self.X-center.x, self.Y-center.y))
# draw the turret
width, height = self.turret.scratch.get_size()
center = Point(width/2, height/2)
surface.blit(self.turret.scratch, (self.turret.X-center.x,
self.turret.Y-center.y))
def __str__(self):
return MySprite.__str__(self) + "," + str(self.velocity)
# this function initializes the game
def game_init():
global screen, backbuffer, font, timer, player_group, player, \
player2, bullets
pygame.init()
screen = pygame.display.set_mode((800, 600))
backbuffer = pygame.Surface((800, 600))
pygame.display.set_caption("Tank Battle Game")
font = pygame.font.Font(None, 30)
timer = pygame.time.Clock()
pygame.mouse.set_visible(False)
# create player tank
player = Tank("tank.png", "turret.png")
player.float_pos = Point(400, 300)
# create second player tank
player2 = Tank("enemy_tank.png", "enemy_turret.png")
player2.float_pos = Point(random.randint(50, 760), 50)
# create bullets
bullets = list()
# this function initializes the audio system
def audio_init():
global shoot_sound, boom_sound
# initialize the audio mixer
pygame.mixer.init()
# load sound files
shoot_sound = pygame.mixer.Sound("shoot.wav")
boom_sound = pygame.mixer.Sound("boom.wav")
# this function uses any available channel to play a sound clip
def play_sound(sound):
channel = pygame.mixer.find_channel(True)
channel.set_volume(0.5)
channel.play(sound)
# main program begins
game_init()
audio_init()
game_over = False
player_score = 0
player2_score = 0
last_time = 0
action1 = False
action2 = False
action3 = False
action4 = False
action5 = False
action6 = False
# main loop
while True:
timer.tick(30)
ticks = pygame.time.get_ticks()
# event section
for event in pygame.event.get():
if event.type == QUIT:
pygame.display.quit()
pygame.quit()
sys.exit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
action1 = True
if event.key == pygame.K_RIGHT:
action2 = True
if event.key == pygame.K_a:
action3 = True
if event.key == pygame.K_d:
action4 = True
if event.key == pygame.K_UP:
action5 = True
if event.key == pygame.K_w:
action6 = True
if event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT:
action1 = False
if event.key == pygame.K_RIGHT:
action2 = False
if event.key == pygame.K_a:
action3 = False
if event.key == pygame.K_d:
action4 = False
if event.key == pygame.K_UP:
action5 = False
if event.key == pygame.K_w:
action6 = False
if action1 == True:
player.rotation -= 4.0
player.turret.rotation -= 4.0
if action2 == True:
player.rotation += 4.0
player.turret.rotation += 4.0
if action3 == True:
player2.rotation -= 4.0
player2.turret.rotation -= 4.0
if action4 == True:
player2.rotation += 4.0
player2.turret.rotation += 4.0
if action5 == True:
if ticks > player.fire_timer + 1000:
player.fire_timer = ticks
player_fire_cannon()
if action6 == True:
if ticks > player2.fire_timer + 1000:
player2.fire_timer = ticks
player2_fire_cannon()
# update section
if not game_over:
# move tank
player.update(ticks)
# update player two
player2.update(ticks)
# update bullets
for bullet in bullets:
bullet.update(ticks)
if bullet.owner == "player":
if pygame.sprite.collide_rect(bullet, player2):
player_score += 1
bullet.alive = False
play_sound(boom_sound)
elif bullet.owner == "player2":
if pygame.sprite.collide_rect(bullet, player):
player2_score += 1
bullet.alive = False
play_sound(boom_sound)
# drawing section
backbuffer.fill((100, 100, 20))
for bullet in bullets:
bullet.draw(backbuffer)
player.draw(backbuffer)
player2.draw(backbuffer)
screen.blit(backbuffer, (0, 0))
if not game_over:
print_text(font, 0, 0, "PLAYER 1: " + str(player_score))
print_text(font, 650, 0, "PLAYER 2: " + str(player2_score))
else:
print_text(font, 0, 0, "GAME OVER")
pygame.display.update()
# remove expired bullets
for bullet in bullets:
if bullet.alive == False:
bullets.remove(bullet)
答案 0 :(得分：1)
我只是在这里猜测，因为运行代码需要几个额外的导入文件。但是看Bullet类，似乎定义了它是从(x,y)到(x+4, y+4)的碰撞矩形。但是，将项目符号绘制到屏幕上时，它使用pygame.draw.circle()在(x,y)上绘制 centred ，因此屏幕上的项目符号有点偏离相对于碰撞矩形。但这就是说，只有2像素了。
def update(self, ticks):
self.position.x -= self.velocity.x * 10.0
self.position.y -= self.velocity.y * 10.0
if self.position.x < 0 or self.position.x > 800 \
or self.position.y < 0 or self.position.y > 600:
self.alive = False
self.rect = Rect(self.position.x, self.position.y, 4, 4)
def draw(self, surface):
pos = (int(self.position.x), int(self.position.y))
pygame.draw.circle(surface, self.color, pos, 4, 0)
对于通过坦克的子弹-代码仅检查更新路径中每个点的碰撞，并且每次更新似乎相距10像素（时间velocity）的距离。因此，子弹可能只存在于坦克的正前方，而在下一次更新时已移至紧随其后。
解决此问题的一种方法是计算子弹在两点之间所经过的路径上的每个像素点，并查看这些坐标中是否有任何一个与坦克重叠。像Mid-Point Line这样的算法将是枚举点的简单方法。该代码中的大多数算法示例仅处理简单的情况，而不能对所有渐变的行都适用。