I have already asked a similar question concerning this problem but my colleague and I still weren't able to fix it. For more information on the problem, please see my first question.
We have defined different objects (sun and planets of our solar system) and the forces between them. Now we want to define a menu which gives us the possibility to choose an object: It will then be defined as the currentobject and the simulation user will be able to vary its mass using a slider. The answer that we got to our first question was that a currentobject must be defined before the function "def M(m)" is used, so we defined the sun as the currentobject. Here are the fragments of our code concerning this part of the simulation:
sun = sphere( pos=vector(0,0,0), radius=6.96E+09, texture="https://i.imgur.com/DTm6i8r.jpg",
mass = 1.989e30, momentum=vector(0,0,0), make_trail=True, visible=True ) #example of a defined object
currentobject=sun
def M(m):
global col, sun, mercury, venus, earth, mars, jupiter, saturn, uranus, neptune, currentobject
currentobject.visible = True
obj = m.selected
if obj == "Sonne":
currentobject = sun
elif obj == "Merkur":
currentobject = mercury
elif obj == "Venus":
currentobject = venus
elif obj == "Erde":
currentobject = earth
elif obj == "Mars":
currentobject = mars
elif obj == "Jupiter":
currentobject = jupiter
elif obj == "Saturn":
currentobject = saturn
elif obj == "Uranus":
currentobject = uranus
elif obj == "Neptun":
currentobject = neptune
currentobject.visible=True
menu(choices=['Sonne', 'Merkur', 'Venus', 'Erde', 'Mars', 'Jupiter', 'Saturn', 'Uranus', 'Neptun'], bind=M)
scene.append_to_caption('\n\n')
scene.append_to_caption("Change mass of chosen object: \n\n")
def setmass(b):
wt.text = '{:1.1f}'.format(b.value)
sl = slider(min=1, max=10, value=1, length=1000, bind=setmass)
wt = wtext(text='{:1.1f}'.format(sl.value))
scene.append_to_caption('\n\n')
while (True):
rate(100)
if running:
if currentobject = sun:
sun.mass = (1.989e30)*sl.value
elif currentobject = mercury:
mercury.mass = (3.285e23)*sl.value
elif currentobject = venus:
venus.mass = (4.869e24)*sl.value
elif currentobject = earth:
earth.mass = (5.974e24)*sl.value
elif currentobject = mars:
mars.mass = (6.4185e23)*sl.value
elif currentobject = jupiter:
jupiter.mass = (1.8987e27)*sl.value
elif currentobject = saturn:
saturn.mass = (5.683e26)*sl.value
elif currentobject = uranus:
uranus.mass = (8.683e25)*sl.value
elif currentobject = neptune:
neptune.mass = (1.0241e26)*sl.value
When the program is run, no error message appears. However, we found out that while the currentobject is changed in the function M, it is not changed afterwards. (When you insert "print (currentobject.mass) in "def M(m)", the chosen objects mass appears in the simulation but when you insert it after the function, the suns mass appears). This means that the calculation always uses the sun as its currentobject and not the object that is chosen with the menu.
