天是时候看到有人问如何在Unity3D的UGUI中实现图案解锁的功能，然后便试了一下。刚开始想用LineRender来实现，但又一想是要在UGUI中，然后就用了另外一种方法，即使用GL类来实现。
GL相关介绍及官方文档
实现后在Android手机上跑的效果如下：
image.png
主要实现GraphicUnLockManager类。代码如下：
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using UnityEngine;
using System.Collections.Generic;
using System;
using UnityEngine.EventSystems;
using UnityEngine.UI;
public class GraphicUnLockManager : MonoBehaviour
{
[Tooltip("含有Selectable及Image组件的UI对象，作为连接点。")]
public List<RectTransform> _lstPoints = new List<RectTransform>();
[Tooltip("用于设置所画线的颜色。（可使用“unlit/Color”Shader）")]
public Material _matLineColor;
[Tooltip("用于设置所画线的高度。")]
public int _nHalfHeight = 15;
[Tooltip("用于设置选择时Image的颜色。")]
public Color _clrSelect = Color.red;
[Tooltip("用于设置未选择时Image的颜色。")]
public Color _clrUnSelect = Color.white;
[HideInInspector]
public List<RectTransform> _lstSelectPoints = new List<RectTransform>();//已选择连接点
[HideInInspector]
public List<int> _lstPassword = new List<int>();//以输入密码
[HideInInspector]
public Action<bool> onInputState;//true为开始输入，false为结束输入
private bool _isPressing = false;//是否按下
private Vector2 _vtPressPos;//按下点坐标
private float _fDistance;//距离
private float _fDegree;//夹角
private Matrix4x4 _matrixTrans;//变换矩阵
private Vector2[] _vertexPos = new Vector2[4];//顶点数组
private Vector2 _tempPos;
void Awake()
{
InitEnterEvent();//初始化所有连接点的消息
ClearLines();//清空相关数据
}
void Update()
{
if (!IsPressed())
{//当未按下时清空是数据
ClearLines();
}
}
bool IsPressed()
{
//触摸
if (Input.touchCount > 0)
{
switch (Input.touches[0].phase)
{
case TouchPhase.Began:
_isPressing = true;
if (onInputState != null)
{
onInputState(true);//状态改变
}
break;
case TouchPhase.Ended:
case TouchPhase.Canceled:
_isPressing = false;
if (onInputState != null)
{
onInputState(false);//状态改变
}
break;
}
_vtPressPos = Input.touches[0].position;
}
else
{
//鼠标
if (Input.GetMouseButtonDown(0))
{
_isPressing = true;
if (onInputState != null)
{
onInputState(true);//状态改变
}
}
if (Input.GetMouseButtonUp(0))
{
_isPressing = false;
if (onInputState != null)
{
onInputState(false);//状态改变
}
}
_vtPressPos = Input.mousePosition;
}
return _isPressing;
}
void OnPostRender()
{
DrawLines();//画所有线
}
void OnGUI()
{
string msg = "";
msg += "是否正在输入:" + IsPressed() + "\n";
msg += "密码:";
for (int i = 0; i < _lstPassword.Count; i++)
{
msg += _lstPassword[i] + ",";
}
GUIStyle guiStyle = new GUIStyle();
guiStyle.normal.textColor = new Color(1, 1, 1); //设置字体颜色
guiStyle.fontSize = 75; //设置字体大小
GUILayout.Label(msg, guiStyle);
}
void InitEnterEvent()
{
//为每个点添加Enter事件
_lstPoints.ForEach((rtTrans) =>
{
EventTrigger trigger = rtTrans.GetComponent<EventTrigger>();
if (trigger == null)
{
trigger = rtTrans.gameObject.AddComponent<EventTrigger>();
}
//添加事件
EventTrigger.Entry entryEnter = new EventTrigger.Entry();
entryEnter.eventID = EventTriggerType.PointerEnter;//进入事件
EventTrigger.TriggerEvent evtEnter = new EventTrigger.TriggerEvent();
evtEnter.AddListener(OnSelectPoint);
entryEnter.callback = evtEnter;
trigger.triggers.Add(entryEnter);
EventTrigger.Entry entryDown= new EventTrigger.Entry();
entryDown.eventID = EventTriggerType.PointerDown;//按下事件
EventTrigger.TriggerEvent evtDown = new EventTrigger.TriggerEvent();
evtDown.AddListener(OnSelectPoint);
entryDown.callback = evtDown;
trigger.triggers.Add(entryDown);
});
}
public void OnSelectPoint(BaseEventData obj)
{
//转换数据类型
PointerEventData data = obj as PointerEventData;
GameObject target = null;
if (null != data.pointerEnter)
{
target = data.pointerEnter;
}
else if (null != data.pointerPress)
{
target = data.pointerPress;
}
AddSelectPoint(target);//添加选择连接点
}
void AddSelectPoint(GameObject obj)
{
if (IsPressed() && null != obj)
{
//将未连接的点添加到需要连接的点的列表中去
RectTransform rtTrans = obj.GetComponent<RectTransform>();
if (null != rtTrans && !_lstSelectPoints.Contains(rtTrans))
{
//添加到绘制列表
_lstSelectPoints.Add(rtTrans);
//添加密码序列
_lstPassword.Add(_lstPoints.IndexOf(rtTrans));
//改变颜色
rtTrans.GetComponent<Image>().color = _clrSelect;
}
}
}
void ClearLines()
{
//清空选择及密码列表
_lstSelectPoints.Clear();
_lstPassword.Clear();
//还原颜色
_lstPoints.ForEach((rtTrans) =>
{
rtTrans.GetComponent<Image>().color = _clrUnSelect;
});
}
void DrawLine(Vector2 vtStart, Vector2 vtEnd)
{
_tempPos = vtEnd - vtStart;
_fDistance = Vector3.Distance(Vector3.zero, _tempPos);//距离
_fDegree = Vector3.Angle(_tempPos, Vector3.right);//与x轴正方向的夹角
//判断旋转方向，逆时针为正，顺时针为付
if (_tempPos.y < 0)
{
_fDegree *= -1;
}
//设置变换矩阵
_matrixTrans.SetTRS(vtStart, Quaternion.Euler(0, 0, _fDegree), Vector3.one);//设置变换矩阵
//设置绘制顶点坐标
_vertexPos[0].x = 0;
_vertexPos[0].y = -_nHalfHeight;
_vertexPos[1].x = 0;
_vertexPos[1].y = _nHalfHeight;
_vertexPos[2].x = _fDistance;
_vertexPos[2].y = _nHalfHeight;
_vertexPos[3].x = _fDistance;
_vertexPos[3].y = -_nHalfHeight;
//绘制
GL.PushMatrix();
GL.LoadPixelMatrix();//使(0,0,0)为左下角，(Screen.width,Screen.height,0)为右上角
GL.MultMatrix(_matrixTrans);
GL.Begin(GL.QUADS);//绘制四边形
for (int n = 0; n < 4; n++)
{
GL.Vertex(_vertexPos[n]);
}
GL.End();
GL.PopMatrix();
}
void DrawLines()
{
//设置线的材质
_matLineColor.SetPass(0);
//连接已选择的点
for (int nIndex = 0; nIndex < _lstSelectPoints.Count - 1; nIndex++)
{
DrawLine(_lstSelectPoints[nIndex].position, _lstSelectPoints[nIndex + 1].position);
}
//连接到Press点
if (IsPressed() && _lstSelectPoints.Count > 0)
{
DrawLine(_vtPressPos, _lstSelectPoints[_lstSelectPoints.Count - 1].position);
}
}
}
\
上面的实现中都有注明，如有不清楚的地方请留言。绘制主要在DrawLine函数中。
然后将GraphicUnLockManager类添加到MainCamera上，只有这样OnPostRender才会被正确调用，使线能够在场景中的物体都渲染完成后再绘制。
创建连接点，如下设置：
设置GraphicUnLockManager，如下设置：
接下来就可以在编辑器中运行看看结果了！按下鼠标左键开始选择，释放结束选择，效果如下：
image.png
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