Forum Archive

Im not too familiar with threading but I thought I shoud use it for a physics test program I made with scene

Is it a good idead to start a new thread like this every time or should I do this a different way?

(This basically checks to see if the circles collide with each other and changes color if it happens; and this is only a portion of the program)

def update(self):
        for circle in self.circles:
            _thread.start_new_thread(self.check_collision, (circle, ))

    def check_collision(self, circle):
        for other in self.circles:
            if circle != other:
                dx = circle.position.x - other.position.x
                dy = circle.position.y - other.position.y
                if math.hypot(dx, dy) < (circle.radius + other.radius):
                    circle.color = COLLIDE_COLOR
                    break
                else:
                    circle.color = CIRCLE_COLOR

Generally you don't want to use threading in scene. Scene is very deterministic -- update gets called at a fixed rate, and the only things that happen happen at that rate. So if you want to check if a collision occurs in this frame, you check in this frame.

http://omz-software.com/pythonista/docs/ios/scene.html#scene.run or http://omz-software.com/pythonista/docs/ios/scene.html#scene.SceneView.frame_interval might allow you that have more time per frame by having fewer frames per second.