circling_correction.gd

"""
The folloing code correctly tracks the change in
angle of the cursor.  Factroing in crossing over
the boundery between 0 and 2PI.
"""

# Variable for storing previews positions
# Old angle is the original angle Godot
# will give. corrected_old_angle is the
# angle in the a range [0, 2pi).
var old_angle = position.angle_to_point(get_local_mouse_position())
var corrected_old_angle = 0

func _process(delta):
  # get the angle to the mouse
	var angle = position.angle_to_point(get_local_mouse_position())
  # correct the angle into the range [0, 2pi]
	var corrected_angle = angle if angle >= 0 else angle + 2*PI
  # Compute an initial change in angle
	var da = corrected_angle - corrected_old_angle
	
  # check if we've crossed a boundary
  # readjust the correct angle
	if old_angle >= 0 and angle < 0:
		da = corrected_angle - (2 * PI - corrected_old_angle)
	
	elif angle >= 0 and old_angle < 0:
		da = (2 * PI - corrected_old_angle) - corrected_angle
	
  # store this for the next computation of da
	corrected_old_angle = corrected_angle
	old_angle = angle