Question

我正在尝试使用GDScript在Godot中创建可播放的精灵。我的角色向左和向右移动，然后在没有任何输入被按下时停下来。

但是，我不想让死神停下来，而是要让精灵放慢速度。我该怎么写？

extends KinematicBody2D

var motion = Vector2()



func _physics_process(delta):

if Input.is_action_pressed("ui_right"):
    motion.x = 250


elif Input.is_action_pressed("ui_left"):
    motion.x = -250

else:
    motion.x = 0

move_and_slide(motion)

pass

Answer 1

好吧，我知道了：

extends KinematicBody2D

var motion = Vector2()



func _physics_process(delta):

if Input.is_action_pressed("ui_right"):
motion.x = 250


elif Input.is_action_pressed("ui_left"):
motion.x = -250

else:
motion.x = motion.x * .9

move_and_slide(motion)

pass

Answer 2

一种非常简单的方法是降低每次更新的速度-一种从物理阻力中借用的概念。

function retrieveCategories(active) {
  document.body.style.cursor = "wait";
  var data = JSON.stringify({
  "active": active
});
console.log(data);

var xhr = new XMLHttpRequest();
xhr.withCredentials = true;

xhr.addEventListener("readystatechange", function () {
  if (this.readyState === 4 && this.status == 403) {
    logout();
    document.body.style.cursor = "initial";
  } else if (this.readyState === 4 && this.status != 200) {
    document.body.innerHTML = 'Error: ' + this.responseText;
    document.body.style.cursor = "initial";
  } else if (this.readyState === 4 && this.status == 200) {
    authToken = this.getResponseHeader('Authorization');
    categories = JSON.parse(this.responseText);
    document.body.style.cursor = "initial";
  }
});

xhr.open("POST", "http://127.0.0.1:7071/retrievecategories");
xhr.setRequestHeader("Content-Type", "application/json");
xhr.setRequestHeader("Authorization", authToken);

xhr.send(data);
}

同样，这非常简单。如果要提供某些保证（例如播放器应在6帧后完全停止播放），则调整拖曳值可能会非常挑剔，尤其是在处理解锁的fps时。

在这种情况下，不要有单个extends KinematicBody2D var motion = Vector2() func _physics_process(delta): if Input.is_action_pressed("ui_right"): motion.x = 250 elif Input.is_action_pressed("ui_left"): motion.x = -250 else: motion.x *= 0.95 # slow down by 5% each frame - play with this value # i.e. make it dependent on delta to account for different fps # or slow down faster each frame # or clamp to zero under a certain threshold move_and_slide(motion) pass向量，而是要有motion和last_motion向量，并在它们之间进行内插，以便每帧获得当前的target_motion向量（您也可以这样做来加速）。这需要您考虑状态转换，例如“当玩家停止按下按钮时”，启动计时器以跟踪插值的起始帧和目标帧之间的进度，等等。。。选择的kind of interpolation function将影响动作对玩家的反应速度或反应迟缓。

下面是使用线性插值在0.2秒内减速的示例：

motion

会感觉到线性减速，但是您可以轻松地将其替换为任何其他功能，例如尝试三次以加快减速，从而降低响应速度：enum MotionState {IDLE, MOVING, DECELERATING} extends KinematicBody2D var state = IDLE var last_motion = Vector2() var time_motion = 0.0 func _physics_process(delta): var motion = Vector2(); if Input.is_action_pressed("ui_right"): motion.x = 250 state = MOVING last_motion = motion elif Input.is_action_pressed("ui_left"): motion.x = -250 state = MOVING last_motion = motion elif state == IDLE motion.x = 0 else: if state == MOVING: # start a smooth transition from MOVING through DECELERATING to IDLE state = DECELERATING # last_motion already holds last motion from latest MOVING state time_motion = 0.2 # accumulate frame times time_motion -= delta if time_motion < 0.0: # reached last frame of DECELERATING, transitioning to IDLE state = IDLE motion.x = 0 else: var t = (0.2 - time_motion) / 0.2 # t goes from 0 to 1 # we're linearly interpolating between last_motion.x and 0 here motion.x = (1 - t) * last_motion.x move_and_slide(motion) pass

如何使2D精灵减速至停止？

2 个答案: