在游戏中，你如何将枪管指向鼠标？
在游戏中，你如何将枪管指向鼠标？
提问于 2021-12-09 00:26:48
我已经修复了this帖子中指出的问题，但现在我对如何将灰色矩形(桶)指向我的鼠标感到困惑。有人能帮忙吗？谢谢!
这是我的代码：
import pygame
import math
pygame.init()
screen = pygame.display.set_mode((400, 400))
pygame.display.set_caption("diep.io")
screen.fill((255,255,255))
auto_shoot = False
class Bullet:
def __init__(self, x_move, y_move, x_loc, y_loc):
self.image = pygame.image.load("C:\\Users\\ender\\OneDrive\\Documents\\repos\\Bullet.png")
self.x_move = x_move
self.y_move = y_move
self.x_loc = x_loc
self.y_loc = y_loc
self.bullet_rect = self.image.get_rect()
def update(self):
self.x_loc += self.x_move
self.y_loc += self.y_move
self.bullet_rect.center = round(self.x_loc), round(self.y_loc)
rect = screen.blit(self.image, self.bullet_rect)
if not screen.get_rect().contains(rect):
bullets.remove(self)
if self.x_loc > 400 or self.y_loc > 400:
bullets.remove(self)
bullet = None
bullets = []
while True:
screen.fill((255, 255, 255))
pygame.draw.rect(screen, (100, 100, 100), (205, 193, 25, 15)) # This is the rectangle I want to point at my mouse
pygame.draw.circle(screen, (82, 219, 255), (200, 200), 15)
for event in pygame.event.get():
if event.type == pygame.MOUSEBUTTONUP:
x = pygame.mouse.get_pos()[0] - 200
y = pygame.mouse.get_pos()[1] - 200
pythag = float(math.sqrt(x**2 + y**2))
bullets.append(Bullet(x/pythag, y/pythag, 200, 200))
for bullet in bullets:
bullet.update()
pygame.display.update()
pygame.time.delay(10)注意:这与其他问题不同，因为我试图在鼠标上指向一个矩形，而其他帖子则将图像指向鼠标。这不是我想做的。其次，游戏矩形是由其左下角定义的，因此这进一步使事情复杂化。
回答 1
Stack Overflow用户
回答已采纳
发布于 2021-12-11 19:25:54
关于子弹的旋转，请参见How to move a sprite according to an angle in Pygame和calculating direction of the player to shoot PyGmae。
计算方向矢量grees(math.atan2(-y_move, x_move))的角度并旋转子弹图像：
class Bullet:
def __init__(self, x_move, y_move, x_loc, y_loc):
self.image = pygame.image.load("C:\\Users\\ender\\OneDrive\\Documents\\repos\\Bullet.png")
self.image = pygame.transform.rotate(self.image, math.degrees(math.atan2(-y_move, x_move)))旋转长方形要复杂一些。在pygame.Surface上绘制大炮
cannon = pygame.Surface((50, 50), pygame.SRCALPHA)
pygame.draw.rect(cannon, (100, 100, 100), (30, 17, 25, 15))
pygame.draw.circle(cannon, (82, 219, 255), (25, 25), 15)见How do I rotate an image around its center using PyGame?。编写一个旋转和blit曲面的函数
def blitRotateCenter(surf, image, center, angle):
rotated_image = pygame.transform.rotate(image, angle)
new_rect = rotated_image.get_rect(center = image.get_rect(center = center).center)
surf.blit(rotated_image, new_rect)使用应用程序循环中的函数绘制加农炮：
while True:
# [...]
x = pygame.mouse.get_pos()[0] - 200
y = pygame.mouse.get_pos()[1] - 200
angle = math.degrees(math.atan2(-y, x))
blitRotateCenter(screen, cannon, (200, 200), angle)
# [...]另见How to rotate an image(player) to the mouse direction?和How can you rotate the sprite and shoot the bullets towards the mouse position?。
完整的例子：
import pygame
import math
pygame.init()
screen = pygame.display.set_mode((400, 400))
pygame.display.set_caption("diep.io")
screen.fill((255,255,255))
clock = pygame.time.Clock()
class Bullet:
def __init__(self, x_move, y_move, x_loc, y_loc):
#self.image = pygame.image.load("C:\\Users\\ender\\OneDrive\\Documents\\repos\\Bullet.png")
self.image = pygame.Surface((20, 5), pygame.SRCALPHA)
self.image.fill((255, 0, 0))
self.image = pygame.transform.rotate(self.image, math.degrees(math.atan2(-y_move, x_move)))
self.x_move = x_move
self.y_move = y_move
self.x_loc = x_loc
self.y_loc = y_loc
self.bullet_rect = self.image.get_rect()
def update(self):
self.x_loc += self.x_move
self.y_loc += self.y_move
self.bullet_rect.center = round(self.x_loc), round(self.y_loc)
rect = screen.blit(self.image, self.bullet_rect)
if not screen.get_rect().contains(rect):
bullets.remove(self)
if self.x_loc > 400 or self.y_loc > 400:
bullets.remove(self)
cannon = pygame.Surface((50, 50), pygame.SRCALPHA)
pygame.draw.rect(cannon, (100, 100, 100), (30, 17, 25, 15))
pygame.draw.circle(cannon, (82, 219, 255), (25, 25), 15)
def blitRotateCenter(surf, image, center, angle):
rotated_image = pygame.transform.rotate(image, angle)
new_rect = rotated_image.get_rect(center = image.get_rect(center = center).center)
surf.blit(rotated_image, new_rect)
bullet = None
bullets = []
auto_shoot = False
run = True
while run:
x = pygame.mouse.get_pos()[0] - 200
y = pygame.mouse.get_pos()[1] - 200
angle = math.degrees(math.atan2(-y, x))
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
if event.type == pygame.MOUSEBUTTONUP:
pythag = float(math.sqrt(x**2 + y**2))
bullets.append(Bullet(x/pythag, y/pythag, 200, 200))
screen.fill((255, 255, 255))
for bullet in bullets:
bullet.update()
blitRotateCenter(screen, cannon, (200, 200), angle)
pygame.display.update()
clock.tick(100)
pygame.quit()
exit()页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/70283340
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