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using UnityEngine;
public class DragItem : MonoBehaviour
{
private Vector3 SelfPivot
{
get
{
var p = transform.position;
return new Vector3(p.x, 0, p.z);
}
}
private Vector3 DraggerPivot
{
get
{
var p = dragger.position;
return new Vector3(p.x, 0, p.z);
}
}
private bool _dragging;
public Transform dragger;
private Vector3 _lastDirection;
private Vector3 _lastSelfPivot;
private float _lastAngle;
private float _lastLength;
private int _currentStep;
private void FixedUpdate()
{
FixedUpdateDragger();
// 判断是否在拖拽
if (! _dragging) return;
// 位置计算
var draggerPivot = DraggerPivot;
var selfPivot = SelfPivot;
var direction = (_lastSelfPivot - draggerPivot).normalized;
var position = draggerPivot + direction * _lastLength;
var y = transform.position.y;
transform.position = new Vector3(
position.x,
y,
position.z
);
// 角度计算
if (direction != _lastDirection)
{
var angle = Vector3.SignedAngle(direction, _lastDirection, Vector3.up);
var selfAngle = transform.eulerAngles;
selfAngle.y -= angle;
transform.eulerAngles = selfAngle;
}
// 记录值
_lastSelfPivot = selfPivot;
_lastDirection = direction;
}
private void FixedUpdateDragger()
{
if (!_dragging && dragger != null)
{
_dragging = true;
var draggerPivot = DraggerPivot;
_lastSelfPivot = SelfPivot;
_lastLength = Vector3.Distance(draggerPivot, SelfPivot);
_lastDirection = (_lastSelfPivot - draggerPivot).normalized;
}
if (_dragging && dragger == null)
_dragging = false;
}
}
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