对象已创建，但 OOP 版本中没有移动

Question

我正在编写一个 OOP 版本的太阳系。当我运行它时，对象被创建，距离和半径也是正确的。但是行星不会移动。但我有一个功能，所以他们应该绕着太阳转。我收到一个名称错误：NameError:name 'planetSphere' is not defined。我尝试删除 def setspeed 部分。然后我可以通过打印看到它的工作，因为轴的数量发生了变化，但我看不到模拟本身中行星的任何变化。完整代码：https://trinket.io/python/e2b520c570

 planets = []


class Sphere(object):
    def __init__(self, pos, radius, make_trail):
        self.pos = pos
        self.radius = radius
        self.make_trail = make_trail



class planet(Sphere):

    def __init__(self, pos, radius, make_trail, mass, velocity):
        super().__init__(pos, radius, make_trail)
        self.mass = mass
        self.velocity = velocity
        planetSphere = sphere (pos = self.pos, radius = self.radius, make_trail = self.make_trail, mass = self.mass, velocity = self.velocity)

    def setPosition(self, newPos ):
        planetSphere.pos = newPos
        print(planetSphere.pos)


sun = planet(pos=vec(0,0,0),radius=s_rad1*1.5, make_trail=True, mass=2e30, velocity=vec(0,0,0))

#Other objects

planets.extend((mercury,venus,earth,mars,jupiter,saturn,uranus,neptun,pluto))

dt = 10000
time = 0.1


while True:

    rate(framerate) 
    print(earth.pos)



    #for-Schlaufe für Berechnung jedes einzelnen Planeten


    for planet2 in planets:
        g_force = vec(0,0,0)
        for planet1 in planets:
            if planet2 != planet1:
                g_force += g * planet1.mass * planet2.mass * (planet1.pos - planet2.pos).norm()  / (planet1.pos - planet2.pos).mag2
        #print((sun.pos - planet.pos).mag2)




        #print(sun.pos)

        #Änderung des Velocity Vektor wird zum alten addiert
        #Da a=F/m // V = a*t(a*dt) 2 Geschw. vektoriell durch F/m ausgedrückt.
            planet2.velocity = planet2.velocity + ( (g_force) / planet2.mass) * 1000 #Richtungsänderung

        #Diese Änderung wird zur alten Position addiert = neue Position
            planet2.pos += planet2.velocity * 1000
            newPos = planet2.pos
            planet2.setPosition(newPos)

Answer 1

def setPosition():
    #planetSphere.pos = self.pos
    print(planetSphere.pos)

在行星类内部定义。所以方法期望的第一个参数是“self”。

此外，按照思路，这可能是您正在寻找的：

def setPosition(self,newPos):
    planetSphere.pos = newPos
    print(planetSphere.pos)

Answer 2

你试过在plane类的init方法中制作planetSphere => self.planetSphere吗？这就是我的意思：

class planet(Sphere):

def __init__(self, pos, radius, make_trail, mass, velocity):
    super().__init__(pos, radius, make_trail)
    self.mass = mass
    self.velocity = velocity
    self.planetSphere = sphere (pos = self.pos, radius = self.radius, make_trail = self.make_trail, mass = self.mass, velocity = self.velocity)

def setPosition(self, newPos ):
    self.planetSphere.pos = newPos
    print(planetSphere.pos)