Vertically Align Godot Camera2D

# https://godotforums.org/discussion/25030/how-do-i-vertically-align-the-viewport-to-not-the-top-when-it-becomes-bigger-than-its-limits
# https://archive.is/vFXJP

extends Camera2D


# -1 = Top
# >-1 and <-0.5 = Range between Top and Middle
# -0.5 = Middle
# >-0.5 and <0 = Range between Middle and Bottom
# 0 (Or better remove the script) = Bottom
export (float) var cam_extension_direction_y = -0.5


onready var camera = get_node(".")


func _process(_delta):
        align_view()


func align_view():
    if get_viewport_rect().size.y > camera.limit_bottom:
        camera.limit_top = ( get_viewport_rect().size.y- camera.limit_bottom ) * cam_extension_direction_y