I am trying to implement turning of front wheels in PyBox2D, for now, I was able to make it turn left/right but I am not able to stop it when the angle reaches zero (to make the car to go straight)
My goal is to stop turning when the angle of a wheel reaches zero or value similar to zero, but not on the beginning (sometimes when the angles are zero they do not move at all, and if possible I would like to make it independent from pressing key on a keyboard (moving those two nested if statements out of the if keyboard_is_pressed(hotkey) part did not help
I hope I made myself clear and thank you very much for any help
EDIT I tried to implement solution given in the answer, it kind of worked but I tried to improve it and now I am stuck again, the wheels turn, but when they return to their initial position they stop moving. One of problems can be that when I press "a" or "d" key my variable self.ticking changes by more than just one, because I am not able to press the key for such a short period of time.
variable self.on_the_beginning is equivalent to on_starting_race from the answer below:
def control(self): # This makes control independent from visualisation
#Front left suspension: index 2
#Front right suspension: index 3
print(self.ticking)
if keyboard.is_pressed("a"):
self.suspensions[2].motorSpeed = -5
self.suspensions[3].motorSpeed = -5
self.ticking -= 1
if keyboard.is_pressed("d"):
self.suspensions[2].motorSpeed = 5
self.suspensions[3].motorSpeed = 5
self.ticking += 1
if self.ticking <= -3:
self.ticking = -3
self.on_the_beginning = True
elif self.ticking >= 3:
self.ticking = 3
self.on_the_beginning = True
if np.radians(-5) <= self.tires[2].wheel.angle <= np.radians(5) and self.on_the_beginning == True and self.ticking !=0:
self.suspensions[2].motorSpeed = 0
self.suspensions[3].motorSpeed = 0
self.tires[2].SetAngularVelocity = 0
self.tires[3].SetAngularVelocity = 0
self.ticking = 0
on_the_beginning = False
If i understand correctly, you can have a variable, say on_starting_race, set to false, then check whenever it is above a set number (say, when it's above 10 you know for a fact that the race has already started and the car moved at least for a few seconds), then change that value to True, now add an if statement to determine whether the value is close to 0 (say val<5) AND on_starting_race is True. There might be a more elegant way, but this is pretty straight forward(assuming you check the state of the car every frame or a set period of time).
Sorry, because I am not 100% sure of your problem without the whole code.
I think the solution could be using an input parameter in you function, let's say first_run, that you can control from inside and outside the function.
def control(self, first_run=True):
This way, you may start the race (from your main program) setting first_run to True, so you don't care about the angle. And use this same function setting first_run to False the rest of the times.
You can also use a self.first_run variable that you may set to True in the init , then setting self.first_run to False if it is True (which is really the first time you use your control() function).
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