我是 Pygame 的新手，但在 Python 上还可以，我正在创建一个带有俯视图的僵尸射击游戏。
按下箭头键时，我设法使角色移动。但现在我需要让玩家面对鼠标/光标而不是一直点击屏幕。
有什么帮助吗？
【问题讨论】：
for event in pygame.event.get():
if event.type == MOUSEMOTION:
mousex, mousey = event.pos
# build a vector between player position and mouse position
moveVector = (mousex-playerx, mousey-playery)
"""
compute the angle of moveVector from current vector that player is facing (faceVector).
you should be keeping and updating this unit vector, with each mouse motion
assume you have initial facing vector as (1,0) - facing East
"""
# compute angle as in [1]
# rotate the image to that angle and update faceVector
[1] - 如何找到两个向量之间的角度： http://www.euclideanspace.com/maths/algebra/vectors/angleBetween/index.htm
您的图像在以小角度旋转时可能会降低质量。 Pygame 文档页面中对此进行了讨论：http://pygame.org/docs/ref/transform.html#pygame.transform.rotate
【讨论】：
event.type == pygame.MOUSEMOTION，你可以使用event.pos获取鼠标位置，而不是调用pygame.mouse.get_pos()。
import math
mouseX, mouseY = pygame.mouse.get_pos()
playerX, playerY = player.get_pos()
angle = math.atan2(playerX-mouseX, playerY-mouseY)
您可能不得不摆弄减法的顺序（即，它可能是 mousePosition-playerPosition）或 atan2 的 x 和 y 参数的顺序（即，您可能需要将 Y 差作为第一个参数传递而不是 X），但这取决于您的坐标系。
【讨论】：
工作代码：
import pygame, sys, math
from pygame.locals import *
#converte in base ai gradi le cordinate x,y
#maxXY= surface MaxXY
#gradoRot = grado di rotazione
#distXY = spostamento in x,y lungo il vettore di cordinate locali dalle cordinate x,y
#movement from one point to another
def Move(t0,t1,psx,psy,speed):
global mx
global my
speed = speed
distance = [t0 - psx, t1 - psy]
norm = math.sqrt(distance[0] ** 2 + distance[1] ** 2)
direction = [distance[0] / norm, distance[1 ] / norm]
bullet_vector = [direction[0] * speed, direction[1] * speed]
return bullet_vector
# Main Function
if __name__ == '__main__':
pygame.init()
FPS = 30 # frames per second setting
fpsClock = pygame.time.Clock()
# set up the window
DISPLAYSURF = pygame.display.set_mode((800, 600), 0, 32)
alfhaSurface = DISPLAYSURF.convert_alpha()
pygame.display.set_caption('test')
shipImg = pygame.image.load('ship.png')
shipImgcpy=shipImg.copy()
vetShip=pygame.math.Vector2(400,300)
gradi = 0
gradiRot=0
mouseX=0
mouseY=0
SHIP_W=40
SHIP_H=40
vetMouse=pygame.math.Vector2(mouseX,mouseY)
#main loop
while True:
DISPLAYSURF.fill((0,0,0))
alfhaSurface.fill((0,0,0))
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
sys.exit()
if event.type == MOUSEBUTTONDOWN:
mouseX, mouseY = pygame.mouse.get_pos()
vetMouse=pygame.math.Vector2(mouseX,mouseY)
gradiRot=**math.atan2(vetShip.x-vetMouse.x, vetShip.y-vetMouse.y)**
gradiRot=**math.degrees(gradiRot)**
pygame.display.set_caption(""+str(gradi) +"="+ str(gradiRot)+" "+ str(vetMouse.angle_to(vetShip)) )
pygame.draw.line(alfhaSurface, (255,255,255), (vetShip.x+SHIP_W,vetShip.y+SHIP_H),(vetMouse.x,vetMouse.y),1)
if gradi != int(gradiRot) :
if gradiRot > gradi and gradi != gradiRot :
gradi=gradi+1
if gradiRot < gradi and gradi != gradiRot :
gradi=gradi-1
shipImgcpy=pygame.transform.rotate(shipImg.copy(),gradi)
elif int(vetMouse.distance_to(vetShip)) >0:
posNext=Move(mouseX,mouseY,vetShip.x+SHIP_W,vetShip.y+SHIP_H,1)
vetShip=pygame.math.Vector2(vetShip.x+posNext[0],vetShip.y+posNext[1])
alfhaSurface.blit(shipImgcpy, tuple(vetShip))
DISPLAYSURF.blit(alfhaSurface,(0,0))
pygame.display.update()
fpsClock.tick(FPS)
【讨论】：
_, angle = (pg.mouse.get_pos()-self.pos).as_polar()
这条线首先计算一个到鼠标位置的向量（self.pos 必须是一个pygame.math.Vector2），.as_polar() 返回由径向距离和角度组成的向量的极坐标。最后用负角（因为pygame的y轴是翻转的）旋转精灵的图像，重新计算矩形。
import pygame as pg
class Player(pg.sprite.Sprite):
def __init__(self, pos):
super().__init__()
self.image = pg.Surface((50, 30), pg.SRCALPHA)
pg.draw.polygon(
self.image,
pg.Color('dodgerblue1'),
((1, 1), (49, 15), (1, 29)))
self.orig_img = self.image
self.rect = self.image.get_rect(center=pos)
self.pos = pg.math.Vector2(pos)
self.vel = pg.math.Vector2(0, 0)
def update(self):
self.rotate()
self.pos += self.vel
self.rect.center = self.pos
def rotate(self):
_, angle = (pg.mouse.get_pos()-self.pos).as_polar()
self.image = pg.transform.rotozoom(self.orig_img, -angle, 1)
self.rect = self.image.get_rect(center=self.rect.center)
def main():
screen = pg.display.set_mode((640, 480))
clock = pg.time.Clock()
all_sprites = pg.sprite.Group()
all_sprites.add(Player((300, 200)))
done = False
while not done:
for event in pg.event.get():
if event.type == pg.QUIT:
done = True
all_sprites.update()
screen.fill((30, 30, 30))
all_sprites.draw(screen)
pg.display.flip()
clock.tick(30)
if __name__ == '__main__':
pg.init()
main()
pg.quit()
math.atan2 可以作为替代。
def rotate(self):
rel_x, rel_y = pg.mouse.get_pos() - self.pos
angle = -math.degrees(math.atan2(rel_y, rel_x))
self.image = pg.transform.rotozoom(self.orig_img, angle, 1)
self.rect = self.image.get_rect(center=self.pos)
【讨论】：
if event.type == MOUSEBUTTONDOWN:
mouseX, mouseY = pygame.mouse.get_pos()
vetMouse=pygame.math.Vector2(mouseX,mouseY)
gradiRot=vetMouse.angle_to(vetShip)
【讨论】：