当我的枪旋转时，我该如何使我的直肠跟随我的枪尖？ Pygame

问题描述

VIDEO我已经有一段时间遇到这个问题了，我试图让我的笔直跟随我的枪尖，这样我才能使子弹看起来像它们从我的枪尖中出来了，但我不确定如何我可以做到的是，我只能使枪旋转，而不能使子弹看起来像是从枪口VIDEO中冒出来的，因为您可以看到我已经弄污了枪的图像和一个小矩形，我将如何做到这一点用枪尖旋转吗？枪在什么位置

这是您可以与此图片一起运行的代码

代码


import pygame,random,math

pygame.init()

window = pygame.display.set_mode((500,500))
pygame.display.set_caption("um..")



# how the gun is blitted



def blitRotate(surf,image,pos,originPos,angle):
 
    # calcaulate the axis aligned bounding Box of the rotated image
    w,h = image.get_size()
    sin_a,cos_a = math.sin(math.radians(angle)),math.cos(math.radians(angle)) 
    min_x,min_y = min([0,sin_a*h,cos_a*w,sin_a*h + cos_a*w]),max([0,sin_a*w,-cos_a*h,sin_a*w - cos_a*h])
 
        # calculate the translation of the pivot 
    pivot        = pygame.math.Vector2(originPos[0],-originPos[1])
    pivot_rotate = pivot.rotate(angle)
    pivot_move   = pivot_rotate - pivot
 
        # calculate the upper left origin of the rotated image
    origin = (pos[0] - originPos[0] + min_x - pivot_move[0],pos[1] - originPos[1] - min_y + pivot_move[1])
 
        # get a rotated image
    rotated_image = pygame.transform.rotate(image,angle)

 
        # rotate and blit the image
    surf.blit(rotated_image,origin)

    

# the gun
class handgun():
    def __init__(self,x,y,height,width,color):
        self.x = x
        self.y = y
        self.height = height
        self.width = width
        self.color = color
        self.rect = pygame.Rect(x,width)
 
        # LOL THESE IS THE HAND
        self.shootsright = pygame.image.load("hands.png")
        self.image = self.shootsright
        self.rect  = self.image.get_rect(center = (self.x,self.y))
        self.look_at_pos = (self.x,self.y)
 
        self.isLookingAtPlayer = False
        self.look_at_pos = (x,y)
        self.hitBox = (self.x + -18,self.y,46,60)

        self.gunDirection = "right"

    def draw(self,drawX,drawY):
        self.rect.topleft =  (drawX,drawY)
 
        # the guns hitBox
        # rotatiing the gun
        dx = self.look_at_pos[0] - self.rect.centerx
        dy = self.look_at_pos[1] - self.rect.centery 
            
        angle = (190/math.pi) * math.atan2(-dy,dx)
        gun_size = self.image.get_size()
        pivot = (8,gun_size[1]//2)
 
        blitRotate(window,self.image,self.rect.center,pivot,angle)

        if((angle > 90 or angle < -90) and self.gunDirection != "left"):
            self.gunDirection = "left"
            self.image = pygame.transform.flip(self.image,False,True)
        if((angle < 90 and angle > -90) and self.gunDirection != "right"):
            self.gunDirection = "right"
            self.image = pygame.transform.flip(self.image,True)

    def lookAt( self,coordinate ):
        self.look_at_pos = coordinate
 
 

 
white = (255,255,255)
handgun1 = handgun(300,300,10,white)




# the square that will be rotating with the gun



class portal:
    def __init__(self,width)
        self.direction = "blobright"

        self.angle = 0

    def draw(self,dx,dy):
        self.rect.topleft = (dx,dy)
        pygame.draw.rect(window,self.color,self.rect)

        



white = (0,0)

port1 = portal(200,200,white)





# the main loop
runninggame = True
while runninggame:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            runninggame = False


    # fill the window black
    window.fill((255,255))

    # draw the rect that will be rotating with the gun tips

    port1.draw(handgun1.x,handgun1.y)

    # draw the gun
    handgun1.draw(port1.x,port1.y)

    handgun1.direction = "right"

    # gun rotation
    mousex,mousey = pygame.mouse.get_pos()
    if not handgun1.isLookingAtPlayer:
        handgun1.lookAt((mousex,mousey))



    pygame.display.update()
pygmae.quit()

解决方法

我不清楚您的要求，但是我更新了代码，因此矩形将始终位于喷枪的射击线上，并且始终在100像素远。

要更新代码：

-在手枪类中，将所有angle的引用更改为self.angle，以便可以在类外部访问角度。

-在门户类（绘制方法）中，使用枪角定位矩形：

def draw(self,dx,dy):
    # keep same distance from gun,use gun angle
    self.dist = 100
    dx = handgun1.x + self.dist*math.cos(-handgun1.angle*(math.pi/180)) -65 # why offset needed ?
    dy = handgun1.y + self.dist*math.sin(-handgun1.angle*(math.pi/180)) -50 # why offset needed ?
    self.rect.topleft = (dx,dy)
    pygame.draw.rect(window,self.color,self.rect)

为了使圆与枪的原点对齐，我必须偏移矩形的原点（-65，-50）。我不知道为什么要这么做。

pygame python