Help: form keeps updating objects after closing, how to stop it?

Hi guys (@clement and @dale)

I have made a script to manipulate objects with the keys and have extracted the essence of the problem here. Use the arrow keys LEFT and RIGHT to make the object rotate.

My problem is that the task continues and the object continues to rotate after i close the form.
So I can make many objects spin in the file… So how do I terminate this when I close the form?

import Rhino
import rhinoscriptsyntax as rs
import System.Windows.Forms as Forms
import math

# Global variables to store the current state
current_angle = 0  # Angle in degrees, 0 means facing "up" (positive Y direction)
move_forward = False
move_backward = False
turn_left = False
turn_right = False

def rotate_object(obj_id, angle):
    """Rotate the object to the given angle."""
    # Find the object's centroid or a suitable rotation point
    bbox=rs.BoundingBox(obj_id)
    centroid = (bbox[0]+bbox[2])/2
    # Apply the rotation transformation
    rotation = Rhino.Geometry.Transform.Rotation(math.radians(angle), centroid)
    rs.TransformObject(obj_id, rotation)

def update_movement(obj_id):
    """Update the object's movement based on the current key states."""
    global current_angle
    
    if turn_left:
        current_angle += 1  # Turn left
    if turn_right:
        current_angle -= 1  # Turn right
    
    # Rotate the object to face the current direction
    rotate_object(obj_id, current_angle)
    

def on_key_down(sender, e):
    """Handle key press events."""
    global move_forward, move_backward, turn_left, turn_right
    
    if e.KeyCode == Forms.Keys.Left:
        turn_left = True
    elif e.KeyCode == Forms.Keys.Right:
        turn_right = True


def on_key_up(sender, e):
    """Handle key release events."""
    global move_forward, move_backward, turn_left, turn_right
    
    if e.KeyCode == Forms.Keys.Left:
        turn_left = False
    elif e.KeyCode == Forms.Keys.Right:
        turn_right = False


def main():
    global obj_id
    obj_id = rs.GetObject("Select an object to move")
    if not obj_id:
        return
    
    # Create a form to capture key events
    form = Forms.Form()
    form.KeyPreview = True
    form.KeyDown += on_key_down
    form.KeyUp += on_key_up
    
    # Configure the form to be visible
    form.Text = "Car Simulator"
    form.Width = 300
    form.Height = 100
    
    # Set up a timer to update the object's movement
    timer = Forms.Timer()
    timer.Interval = 10  # Update every 10 ms
    timer.Tick += lambda sender, e: update_movement(obj_id)
    timer.Start()
    
    # Show the form normally (not minimized)
    form.ShowInTaskbar = True
    form.StartPosition = Forms.FormStartPosition.CenterScreen
    
    # Run the form's main loop
    form.ShowDialog()

if __name__ == "__main__":
    main()

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