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我在Pygame中試驗並試圖製作一個自上而下的射手,並且發現了一個朝向點here的角運動的腳本,並將其用於子彈。我遇到了一個問題,我如何讓子彈向計算的方向移動。我不是在數學(還)很大,但據我所知大多數這是怎麼回事:讓一個物體不斷向一個方向移動Pygame
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]
它是基於移動deltaY/DELTAX的斜率公式。對?有人知道如何做到這一點?
下面是引用完整的源代碼:
import pygame
from pygame.locals import *
import math
#init stuff
pygame.init()
screen=pygame.display.set_mode((640,480))
clock=pygame.time.Clock()
run=True
orbs=[]
px=1
py=1
clock=pygame.time.Clock()
#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
#bullet class
class Orb(object):
def __init__(self,posorg,posdest):
self.posx=posorg[0]
self.posy=posorg[1]
self.targ=posdest
self.posorg=posorg
def update(self):
bullet_vector=Move(self.targ[0],self.targ[1],self.posx,self.posy,20)
self.posx += bullet_vector[0]
self.posy += bullet_vector[1]
pygame.draw.circle(screen, ((0,0,255)), (int(self.posx),int(self.posy)), 5)
#main loop
while run:
screen.fill((220,220,220))
for o in orbs:
o.update()
(mx,my)=(pygame.mouse.get_pos()[0],pygame.mouse.get_pos()[1])
for e in pygame.event.get():
#quit on close button
if e.type == QUIT:
run=False
if e.type==MOUSEBUTTONDOWN:
if e.button==1:
orbs.append(Orb((px,py),(mx,my)))
#player movement
key=pygame.key.get_pressed()
if key[K_a]:
px-=2
if key[K_d]:
px+=2
if key[K_w]:
py-=2
if key[K_s]:
py+=2
clock.tick(60)
pygame.draw.circle(screen, ((2,150,2)), (int(px),int(py)), 30)
pygame.display.update()
我打算有一個範圍,所以這會很好。非常感謝! –