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godot - set_global_position setting position to the wrong value

问题描述

Hey there I have a function which positions a KinematicBody2D's (the Player) body next to a Node2D (a portal). 2 portals are linked together and when the player enters portal X in Scene A they are placed next to the corresponding portal X in Scene B and vice versa. Here is the function:

func fix_player_position(entry_portal_link_id):
    var pos = exit_positions[entry_portal_link_id]
    var new_pos: Vector2
    print("Current entry points for ")
    print(exit_positions)
    $player.set_global_position(Vector2(0,0))
    print("Player's position before change: " + str($player.get_global_position()))

    if portal_list[entry_portal_link_id].landing_point == Direction.Up:
        new_pos = Vector2(pos.x, pos.y-64)
    elif portal_list[entry_portal_link_id].landing_point == Direction.Down:
        new_pos = Vector2(pos.x, pos.y+64)
    elif portal_list[entry_portal_link_id].landing_point == Direction.Left:
        new_pos = Vector2(pos.x-64, pos.y)
    elif portal_list[entry_portal_link_id].landing_point == Direction.Right:
        new_pos = Vector2(pos.x+64, pos.y)
    $player.set_global_position(new_pos)
    print(pos)
    print(new_pos)
    print($player.get_global_position())

here we get the position of the Node2D, reset the players (KinematicBody2D) position to (0,0) apply an offset depending on which side we want to place the KinematicBody2D, and then set the new position and print out all the positions. However it doesn't work correctly. Here is the last output

Current entry points for 
{house_link1:(-3807.48999, 11041.799805), house_link2:(-4132.839844, 10655)} # We store the positions in a dictionary using the portal ID
Player's position before change: (-26252.199219, 11936) # This is supposed to be (0,0)
(-4132.839844, 10655) # The pos variable, i.e the stored position of the Node2D
(-4132.839844, 10719) # The new_pos, i.e. the intended position of the character
(-30385.039062, 22655) # The position of the character after setting

The # comments are added in by me to clarify what is being printed out. As you can clearly see the set_global_position call is not setting the position correctly. However it does set the players position correctly on a different scene.

Scene A -> Scene B, works correctly

Scene B -> Scene A, suddenly does not work correctly.

As you can see I'm a bit lost here, is this a bug within gdscript itself? Or am I an idiot and doing something wrong?

Here is the full output of going from Scene A -> Scene B -> Scene A

Current entry points for 
{house_link1:(32, -288), house_link2:(-355.494995, -477.505005)}
Player's position before change: (0, 0)
(-355.494995, -477.505005) # pos
(-355.494995, -413.505005) # new_pos
(-355.494995, -413.505005) # players position

Current entry points for 
{house_link1:(-3807.48999, 11041.799805), house_link2:(-4132.839844, 10655)}
Player's position before change: (-26252.199219, 11936)
(-4132.839844, 10655) # pos
(-4132.839844, 10719) # new_pos
(-30385.039062, 22655) # players_position

标签： godotgdscript

解决方案

所以我不确定实际问题是什么，但解决方案是更换

$player.set_global_position(new_pos)

和

$player.position = new_pos

并且代码成功运行。

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