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using System;
using JetBrains.Annotations;
using UnityEngine;
namespace Camera
{
public class CameraFollow : MonoBehaviour
{
[CanBeNull] public static CameraFollow Current;
private Transform _followTarget;
private float _defaultYaw;
private bool _enableMove;
private float _height;
[CanBeNull]
public Transform followTarget
{
get => _followTarget;
set {
if (_followTarget == value) return;
_followTarget = value;
if (_followTarget != null)
OnFollowTargetChanged(value);
else
OnFollowTargetLost();
}
}
private void Awake()
{
_defaultYaw = rotationYaw.eulerAngles.y;
if (Current != null)
Debug.LogWarning("Duplicate CameraFollow Found!");
Current = this;
followTarget = defaultFollowTarget;
}
[Header("Parameters")]
[SerializeField] private bool enableYaw;
[SerializeField] private Transform defaultFollowTarget;
[SerializeField] [Range(0.015f, 1f)] private float yawRotationLerp;
[SerializeField] [Range(0.015f, 1f)] private float positionLerp;
[SerializeField] [Range(0.015f, 1f)] private float heightLerp;
[SerializeField] private LayerMask heightCheckLayerMask;
[Header("Bindings")]
[SerializeField] private Transform rotationYaw;
[SerializeField] private Transform rotationPitch;
[SerializeField] private Transform positionCamera;
[SerializeField] private Transform positionHeight;
private void OnFollowTargetChanged([CanBeNull] Transform target)
{
Debug.Log($"Follow target: {target?.name}");
_enableMove = target != null;
}
private void OnFollowTargetLost()
{
Debug.Log("Follow target lost");
_enableMove = false;
}
private void FixedUpdate()
{
FixedUpdateHeight();
if (_enableMove)
{
try
{
FixedUpdateMoveCamera();
}
catch (NullReferenceException)
{
OnFollowTargetLost();
}
}
}
private void FixedUpdateMoveCamera()
{
var transformYaw = _followTarget.rotation.eulerAngles.y;
var transformPosition = _followTarget.position;
var targetYaw = transformYaw;
var targetYawRotation = Quaternion.Euler(0, enableYaw ? targetYaw : _defaultYaw, 0);
var targetPosition = new Vector3(transformPosition.x, 0, transformPosition.z);
transform.position = Vector3.Lerp(transform.position, targetPosition, positionLerp);
rotationYaw.rotation = Quaternion.Lerp(rotationYaw.rotation, targetYawRotation, yawRotationLerp);
positionHeight.position = new Vector3(
transformPosition.x,
Mathf.Lerp(positionHeight.position.y, _height, heightLerp),
transformPosition.z
);
}
private void FixedUpdateHeight()
{
var transformPosition = transform.position;
var start = transformPosition + Vector3.up * 100;
var end = transformPosition + Vector3.down * 100;
Physics.Linecast(start, end, out RaycastHit hit, heightCheckLayerMask);
if (hit.collider == null)
_height = transformPosition.y;
else
_height = hit.point.y;
}
private void OnDestroy()
{
if (Current == this)
Current = null;
}
}
}
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