Convert between position + rect extents and margins

pos_margin_convert.gd

# This helps a lot when trying to use Controls to represent a translated CollisionShape2D for a tool script
# I don't know if it's useful for anything else

static func pos_to_margin(position: Vector2, extents: Vector2) -> Dictionary:
    var margin_left := position.x - extents.x
    var margin_right := position.x + extents.x
    var margin_top := position.y - extents.y
    var margin_bottom := position.y + extents.y
    return {
        "margin_left": margin_left,
        "margin_right": margin_right,
        "margin_top": margin_top,
        "margin_bottom": margin_bottom
    }

static func margin_to_pos(margin_left: float, margin_right: float, margin_top: float, margin_bottom: float, centered: bool) -> Dictionary:
    var position := Vector2(
        (margin_left + margin_right) / 2,
        (margin_top + margin_bottom) / 2)
    var extents := Vector2(
        margin_right - margin_left,
        margin_bottom - margin_top)
    if centered:
        extents /= 2
    else:
        position -= extents/2
    return {
        "position": position,
        "extents": extents
    }