Godot 2D平滑玩家移动脚本报错求助

错误原因与修复方案 #

1. velocity 重定义错误（Line 9） #

CharacterBody2D类本身自带velocity成员变量，你自定义的var velocity = Vector2.ZERO与原生属性冲突，导致报错。

• 修复：删除自定义的velocity变量，直接使用CharacterBody2D自带的velocity属性即可。

2. linear_velocity 未定义错误（Line 48） #

linear_velocity是Godot 3中KinematicBody2D的属性，Godot 4里的CharacterBody2D改用velocity控制移动，且需要调用move_and_slide()才能完成实际移动。

• 修复：删除linear_velocity = velocity，替换为move_and_slide()。

修改后的完整代码 #

const SPEED = 200
const FRICTION = 5
const DASH_SPEED = 400
const DASH_DURATION = 0.1
const DASH_COOLDOWN = 1.5

var dashTimer = 0
var canDash = true

func _physics_process(delta: float) -> void:
    # Player movement
    var inputVector = Vector2.ZERO
    if Input.is_action_pressed("ui_up"):
        inputVector.y -= 1
    if Input.is_action_pressed("ui_down"):
        inputVector.y += 1
    if Input.is_action_pressed("ui_left"):
        inputVector.x -= 1
    if Input.is_action_pressed("ui_right"):
        inputVector.x += 1

    # Apply friction
    if inputVector == Vector2.ZERO:
        velocity = velocity.linear_interpolate(Vector2.ZERO, FRICTION * delta)
    else:
        velocity += inputVector.normalized() * SPEED * delta

    # Perform dash
    if canDash and Input.is_action_just_pressed("dash"):
        var dashDirection = get_global_mouse_position() - position
        var dashDistance = dashDirection.length()
        if dashDistance > 0:
            dashDirection = dashDirection.normalized()
            velocity = dashDirection * DASH_SPEED
            dashTimer = DASH_DURATION
            canDash = false

    # Apply dash cooldown
    if not canDash:
        dashTimer -= delta
        if dashTimer <= 0:
            canDash = true

    # 执行移动（CharacterBody2D必需调用此方法）
    move_and_slide()

内容的提问来源于stack exchange，提问作者TriggerFox Games