Pygame做雪碧面对老鼠

Question

我是Pygame的新手，但对Python还行，我创建了一个俯视僵尸射击游戏。
按下箭头键时，我设法使角色移动。但现在我需要让播放器面对鼠标/光标，而不是一直点击屏幕。
有什么帮助吗？

Answer 1

import math

mouseX, mouseY = pygame.mouse.get_pos()
playerX, playerY = player.get_pos()

angle = math.atan2(playerX-mouseX, playerY-mouseY)

您可能需要修改减法的顺序（例如，它可能是鼠标位置playerPosition）或x和y参数到atan2的顺序（例如，您可能需要将y差异作为第一个参数而不是x传递），但这取决于您的坐标系。

Answer 2

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

当以小角度旋转时，图像可能会失去质量。Pygame文档页中讨论了这个问题：http://pygame.org/docs/ref/transform.html#pygame.transform.rotate

Answer 3

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)